WO2020121993A1 - 2液硬化性ウレタン粘着剤 - Google Patents
2液硬化性ウレタン粘着剤 Download PDFInfo
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- WO2020121993A1 WO2020121993A1 PCT/JP2019/048000 JP2019048000W WO2020121993A1 WO 2020121993 A1 WO2020121993 A1 WO 2020121993A1 JP 2019048000 W JP2019048000 W JP 2019048000W WO 2020121993 A1 WO2020121993 A1 WO 2020121993A1
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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- C08G18/08—Processes
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- C08G18/22—Catalysts containing metal compounds
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3228—Polyamines acyclic
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
- C08G18/4841—Polyethers containing oxyethylene units and other oxyalkylene units containing oxyethylene end groups
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
- C08G18/4845—Polyethers containing oxyethylene units and other oxyalkylene units containing oxypropylene or higher oxyalkylene end groups
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- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
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- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C09J7/00—Adhesives in the form of films or foils
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
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- C09J2475/00—Presence of polyurethane
Definitions
- the present invention relates to a two-component curable urethane adhesive.
- urethane adhesives acrylic adhesives, silicone adhesives, rubber adhesives, etc. are known and are used in a wide range of fields and applications such as optical members, automobile members, building materials and medical applications. ..
- urethane adhesives have a small tack and strong adhesion performance is difficult to obtain, so acrylic adhesives that can be designed in a wide range from slight adhesion to strong adhesion are the mainstream, but with the diversification of needs, adherends Urethane pressure-sensitive adhesives have also been studied because of their good followability to, and excellent adhesive properties (for example, Patent Document 1).
- Patent Document 1 in order to express the strength of the pressure-sensitive adhesive sheet, it is necessary to use many curing agents or increase the number of cross-linking points, resulting in poor adhesion and flexibility.
- the cured film of the obtained pressure-sensitive adhesive becomes brittle.
- the object of the present invention is a two-component curability that has a viscosity that is easy to handle even though it is a urethane adhesive that does not substantially contain a solvent, has weak to strong adhesive properties, and has excellent physical properties of a cured film. It is to provide a urethane adhesive.
- the present invention contains a main agent and a curing agent, the main agent having a hydroxyl group-containing urethane prepolymer (P1) obtained by reacting a polyol component (A) and an organic polyisocyanate component (B) and/or a polyol.
- the component (A) is contained, and the curing agent has a urethane prepolymer (P2) and/or an organic polyisocyanate component (P2) having an isocyanate group formed by reacting the polyol component (A) and the organic polyisocyanate component (B).
- the polyol component (A) used in the urethane prepolymer (P1) having a hydroxyl group and/or the polyol component (A) used as the main component is a group represented by the general formula (1) at the molecular end and/or A polyol (A1) containing a polyol (A1) having a group represented by the general formula (2) is contained in the polyol (A1) such that the ratio of the total number of groups represented by the general formula (1) in the polyol (A1) is It is 40% or more based on the total number of groups represented by formula (1) and the number of groups represented by general formula (2).
- the average value of the total unsaturations of all the polyol components (A) used in the two-component curable urethane adhesive is 0.010 meq/g or less.
- the urethane prepolymer (P1) and the urethane prepolymer (P2) have a weight average molecular weight of 1,000 to 100,000.
- the chemical formula weight or number average molecular weight of the polyol component (A) and the organic polyisocyanate component (B) is 20,000 or less.
- the proportion of the total weight of the solvent [excluding the polyol component (A)] contained in the main agent and the solvent [excluding the organic polyisocyanate component (B)] contained in the curing agent is such that the main agent and the curing agent are contained. 5% by weight or less based on the total weight of [In the general formulas (1) and (2), a is independently an integer of 0 or more. ]
- the two-component curable urethane pressure-sensitive adhesive of the present invention is a urethane pressure-sensitive adhesive that does not substantially contain a solvent, has a viscosity that is easy to handle, has weak to strong adhesive performance, and has excellent cured film physical properties. Have.
- the two-component curable urethane adhesive of the present invention contains a base material and a curing agent, and the base material is a urethane prepolymer having a hydroxyl group formed by reacting a polyol component (A) and an organic polyisocyanate component (B). (P1) and/or the polyol component (A).
- the curing agent contains a urethane prepolymer (P2) having an isocyanate group obtained by reacting a polyol component (A) with an organic polyisocyanate component (B) and/or an organic polyisocyanate component (B).
- the polyol component (A) used in the urethane prepolymer (P1) having a hydroxyl group and/or the polyol component (A) used as the main component is a group represented by the above general formula (1) at the molecular end and/or It contains a polyol (A1) having a group represented by the general formula (2).
- the ratio of the total number of the groups represented by the general formula (1) included in the polyol (A1) is determined by the number of the groups represented by the general formula (1) included in the polyol (A1) and the general formula (2). It is 40% or more based on the total number of represented groups.
- a is independently an integer of 0 or more.
- the polyol component (A1) used in the urethane prepolymer (P1) and/or the polyol component (A1) used as the main agent is a polyoxy having a hydroxypropyl group at the molecular end represented by the general formula (3).
- Alkylene polyol (a1) [a compound in general formula (1) and general formula (2), wherein a is 0] and its ethylene oxide adduct (a2) [represented by general formula (1) in which a is 1 or more]
- Examples of the polyoxyalkylene polyol (a1) having a hydroxypropyl group at the molecular end include compounds represented by the general formula (3).
- X in the general formula (3) is a m-valent residue obtained by removing active hydrogen atoms from a compound having m active hydrogen atoms, and m is an integer of 2 to 20.
- m exceeds 20
- the viscosity of the polyoxyalkylene polyol (a1) may increase, and the viscosity of the mixed solution of the main agent and the curing agent during coating may increase.
- the compound having m active hydrogen atoms is at least a hydroxyl group-containing compound, an amino group-containing compound, a carboxyl group-containing compound, a hydroxyl group such as thiol, a primary or secondary amino group, a carboxyl group and a mercapto group.
- the compound which has 1 type of group is mentioned.
- a compound having a hydroxyl group equivalent of 160 or less and two or more hydroxyl groups [an aliphatic compound having two or more hydroxyl groups [an aliphatic dihydric alcohol having 2 to 20 carbon atoms ⁇ alkylene glycol (eg, ethylene glycol, propylene glycol, 1,3 -Butylene glycol, 1,4-butanediol, 1,6-hexanediol, 3-methylpentanediol, neopentyl glycol, 1,9-nonanediol, etc.) ⁇ ;
- alkylene glycol eg, ethylene glycol, propylene glycol, 1,3 -Butylene glycol, 1,4-butanediol, 1,6-hexanediol, 3-methylpentanediol, neopentyl glycol, 1,9-nonanediol, etc.
- the above polyhydric alcohols (glycerin, tri
- the Mn in the present invention can be measured by gel permeation chromatography under the following conditions, for example.
- Device "Waters Alliance 2695" [manufactured by Waters] Column: "Guardcolumn Super HL” (one), “TSKgel SuperH2000, TSKgel SuperH3000, TSKgel SuperH4000 (both manufactured by Tosoh Corporation) are connected to each one"
- Sample solution Tetrahydrofuran solution solution of 0.25 wt% Injection volume: 10 ⁇ l
- Flow rate 0.6 ml/min
- Measurement temperature 40°C
- Detector Refractive index detector Reference substance: Standard polyethylene glycol
- Primary monoamine mono(cyclo)alkylamines having 1 to 20 carbon atoms (methylamine, ethylamine, butylamine, octylamine, dodecylamine, cyclohexylamine, etc.), aromatic and araliphatic monoamines having 6 to 12 carbon atoms ( Aniline, toluidine, benzylamine and the like), etc.];
- Polyamines having two or more active hydrogens aliphatic diamines having 2 to 12 carbon atoms or more (eg ethylenediamine, propylenediamine, hexamethylenediamine and mono- or di-alkyl (C1-4) alkylenediamine (dimethyl) Propylenediamine, etc.), alicyclic diamine having 6 to 15 carbon atoms (1,4-diaminocyclohexane, isophoronediamine, 4,4′-diaminocyclohexylmethane
- an aliphatic polycarboxylic acid having 2 to 36 carbon atoms succinic acid, glutaric acid, adipic acid, sebacic acid, maleic acid, fumaric acid, dimerized linoleic acid, etc.
- Aromatic polycarboxylic acids phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, etc.
- unsaturated carboxylic acid polymers [(meth)acrylic acid (co)polymers with Mn of 2,000 or less, etc. ] And a mixture of two or more of these.
- the thiol includes a polythiol having a carbon number of 2 to 6 or more and having a valence of 2 to 8 (ethanedithiol, propanedithiol, 1,3- or 1,4-butanedithiol, 1,6-hexanedithiol and 3-methyl-thiol). 1,5-pentanedithiol, etc.) and the like.
- a hydroxyl group-containing compound and an amino group-containing compound are preferable, and more preferable are an aliphatic compound having a hydroxyl group equivalent of 160 or less and two or more hydroxyl groups and a castor oil-based polyol.
- propylene glycol, glycerin, pentaerythritol, dipentaerythritol, polyglycerin (polymerization degree: 2 to 20) and castor oil are particularly preferable.
- a in the general formula (3) is a phenyl group, a halogenated phenyl group or an alkylene group having 2 to 12 carbon atoms, which may be substituted with a halogen atom, and is a straight chain or branched chain having 2 to 12 carbon atoms.
- A examples include ethylene group, 1,2- or 1,3-propylene group, 1,2-, 2,3-, 1,3- or 1,4-butylene group and C 5-12
- examples thereof include a 1,2-alkylene group (1,2-dodecylene group and the like), a 1,2-cyclohexylene group, a chloropropylene group, a bromopropylene group, a phenylethylene group and a chlorophenylethylene group.
- (A-O) in the general formula (3) is obtained by adding an alkylene oxide (hereinafter abbreviated as AO) to the above compound having m active hydrogen atoms.
- AO alkylene oxide
- examples of AO used include ethylene oxide (hereinafter abbreviated as EO), 1,2-propylene oxide (hereinafter abbreviated as PO), 1,3-propylene oxide, 1,2-, 1,3-, 2,3 -Or 1,4-butylene oxide (hereinafter, butylene oxide is abbreviated as BO), ⁇ -olefin oxide having 5 to 12 carbon atoms, epihalohydrin (epichlorohydrin, epibromohydrin, etc.), styrene oxide, 1,2 -Cyclohexene oxide and a combination of two or more of these may be mentioned, and when p (AO) is composed of two or more oxyalkylene groups, the bonding mode may be either block or random.
- PO and 1,2-BO are preferable from the
- Z in the general formula (3) is a propylene group
- p is an integer of 0 to 199
- q is an integer of 1 to 200
- the polyoxyalkylene polyol (a1) can be confirmed to have a hydroxypropyl group terminal by, for example, 1 H-NMR method.
- the hydroxypropyl group includes a primary hydroxyl group (hydroxyl group bonded to primary carbon) represented by the following chemical formula (4) and a secondary hydroxyl group (hydroxyl group bonded to secondary carbon) represented by the chemical formula (4′).
- the content of the primary hydroxyl group is the ratio of the number of the primary hydroxyl group to the total number of the primary hydroxyl group and the secondary hydroxyl group (hereinafter, abbreviated as primary rate). Is preferably 40% or more, more preferably 60% or more, and particularly preferably 70% or more, from the viewpoint of tackiness and suppression of cohesive failure of the pressure-sensitive adhesive during peeling.
- the rate of primary conversion can be determined by pre-treating (esterifying) the sample in advance and then measuring by 1 H-NMR method.
- sample preparation method About 30 mg of a measurement sample is weighed in an NMR sample tube having a diameter of 5 mm, and about 0.5 ml of a deuterated solvent is added and dissolved. Then, about 0.1 ml of trifluoroacetic anhydride is added to obtain a sample for analysis.
- a deuterated solvent for example, a solvent capable of dissolving the sample is appropriately selected from deuterated chloroform, deuterated toluene, deuterated dimethylsulfoxide, deuterated dimethylformamide, and the like.
- ⁇ Calculation method of first-classification rate> By the pretreatment method described above, the hydroxyl group at the terminal of the polyoxyalkylene polyol reacts with the added trifluoroacetic anhydride to form a trifluoroacetic acid ester. As a result, the signal derived from the methylene group to which the primary hydroxyl group is bonded is observed at around 4.3 ppm, and the signal derived from the methine group to which the secondary hydroxyl group is bonded is observed at around 5.2 ppm.
- the first-classification rate is calculated by the following formula.
- the above polyoxyalkylene polyol (a1) can be produced, for example, by the method described in JP-A No. 2000-344881.
- Preferred examples of the polyoxyalkylene polyol (a1) include an active hydrogen-containing compound (a0) represented by the following general formula (5) in the presence of a tris(pentafluorophenyl)borane catalyst (hereinafter abbreviated as TPB).
- TPB tris(pentafluorophenyl)borane catalyst
- examples thereof include those obtained by ring-opening addition polymerization of PO.
- TPB tris(pentafluorophenyl)borane catalyst
- PO addition tends to proceed so that the terminal hydroxyl group selectively becomes the group of chemical formula (4).
- X, A and m in the general formula (5) are the same as those in the general formula (3), and p is 0 or an integer of 1 to 199.
- the same compounds as those exemplified as the compound having m active hydrogen atoms in the explanation of the general formula (3) can be mentioned.
- the active hydrogen-containing compound (a0) is (co)added to the above-mentioned compound having m active hydrogen atoms by using AO using a conventionally known catalyst (alkali metal hydroxide etc.).
- Polyols obtained by the above reaction and preferable examples are PO adducts of propylene glycol, PO adducts of glycerin, PO adducts of polyglycerin, 1,2-BO adducts of propylene glycol, and 1,2-BO of glycerin. Examples thereof include adducts, polyglycerin 1,2-BO adducts, and glycerin PO/1,2-BO co-adducts (block or random).
- the amount of TPB used in producing the polyoxyalkylene polyol (a1) by ring-opening addition polymerization of PO with the active hydrogen-containing compound (a0) is not particularly limited, but based on the weight of the polyoxyalkylene polyol (a1). It is preferably 0.00005 to 10% by weight, more preferably 0.0001 to 1% by weight.
- the number of moles of PO added is 1 to 200 moles, preferably 2 to 100 moles, and more preferably 3 to 30 moles per active hydrogen atom of the active hydrogen-containing compound (a0).
- the number of added moles of all AO (the total of AO of the first stage and PO of the second stage) per active hydrogen atom of the compound having m active hydrogen atoms is 1 to 200 mol, preferably 3 ⁇ 100 mol.
- the viscosity of the polyoxyalkylene polyol (a1) does not become too high, and the viscosity of the mixed liquid of the main agent and the curing agent can be prevented from becoming too high.
- q in the general formula (3) is 1 to 200, preferably 2 to 100, and more preferably 3 to 30. Further, p+q in the general formula (3) is 1 to 200, preferably 3 to 100.
- the reaction temperature for the ring-opening addition polymerization of PO is preferably 0 to 250°C, more preferably 20 to 180°C. From the viewpoint of controlling the reaction temperature, a method in which PO is added dropwise to the mixture of the active hydrogen-containing compound (a0) and TPB or a mixture of PO and TPB is added to (a0) is preferable.
- the produced addition polymer contains TPB, it is adsorbed and removed using an adsorbent such as synthetic silicate (magnesium silicate and aluminum silicate) and activated clay.
- an adsorbent such as synthetic silicate (magnesium silicate and aluminum silicate) and activated clay.
- Preferred specific examples of the polyoxyalkylene polyol (a1) constituting the polyol component (A) in the present invention include PO adduct of propylene glycol, PO adduct of polypropylene glycol (secondary terminal hydroxyl group), PO adduct of glycerin.
- the EO adduct (a2) of the polyoxyalkylene polyol (a1) in the present invention can be obtained by adding EO by a method commonly used for the polyoxyalkylene polyol (a1).
- the amount of the added oxyethylene group is 40 based on the total weight of the oxyalkylene groups contained in the EO adduct (a2) of the polyoxyalkylene polyol (a1) from the viewpoint of suppressing the decrease in adhesive strength after the wet heat test. It is preferably not more than 30% by weight, more preferably not more than 30% by weight, particularly preferably not more than 20% by weight, particularly preferably not more than 15% by weight, most preferably not more than 10% by weight.
- the total content of the polyoxyalkylene polyol (a1) and its EO adduct (a2) in the polyol component (A) is a polyol. It is preferably 50% by weight or more, more preferably 70% by weight or more, based on the weight of the component (A). If it is less than 50% by weight, it may be difficult to obtain the effects of the present invention.
- the hydroxyl value of the polyoxyalkylene polyol (a1) and its EO adduct (a2) varies depending on the presence or absence of the other polyol (a3) to be used later and the type of the polyol to be used, but preferably 5 to 800 mgKOH/g, It is preferably 10 to 450 mg KOH/g, particularly preferably 30 to 300 mg KOH/g.
- a relatively high hydroxyl value for example, 400 to 1,500 mgKOH/g, particularly 450 to 1,200 mgKOH/g is preferable.
- the hydroxyl value can be measured by the method described in JIS K1557-1.
- Two or more kinds of polyoxyalkylene polyol (a1) and its EO adduct (a2) may be used in combination.
- Examples of the combined use include, for example, different types of active hydrogen-containing compounds (a0) [for example, those based on polyhydric alcohols (glycerin etc.) and those based on polyamines (ethylene diamine etc.), number of functional groups [general Different in m] in the formula (3) [for example, those based on 2-3 functional compounds (ethylene glycol, glycerin, etc.) and 4-8 functional compounds (pentaerythritol, sorbitol, sucrose, etc.) Those having different hydroxyl values or AO addition mole numbers [p+q in the general formula (3)] [having a hydroxyl value of 400 mgKOH/g or more (eg 450 to 700 mgKOH/g) and less than 400 mgKOH/g (eg 30 to 300 mgKOH) /G)]].
- the polyol component (A) in the present invention may contain other polyol (a3) in addition to the polyoxyalkylene polyol (a1) and its EO adduct (a2).
- Examples of the other polyol (a3) include polyether polyol, polyester polyol, polyolefin polyol, polyalkadiene polyol and acrylic polyol.
- polyether polyol polyethylene glycol, polytetramethylene ether glycol, poly-3-methyltetramethylene ether glycol, copolymerized polyoxyalkylene diol [tetrahydrofuran (THF)/EO copolymerized diol and THF/3-methyltetrahydrofuran copolymerized Adiol adducts of diols and the like (weight ratio is, for example, 1/9 to 9/1)] and bisphenol compounds, which do not correspond to polyoxyalkylene polyol (a1) or its EO adduct (a2); 3 Polyether polyol having a functionality or higher, which does not correspond to the polyoxyalkylene polyol (a1) or the EO adduct (a2) thereof, for example, an AO adduct of a trihydric or higher polyhydric alcohol [AO adduct of glycerin and AO adduct of trimethylolpropane, etc.]; and
- Castor oil fatty acid ester polyols eg castor oil, partially dehydrated castor oil and castor oil fatty acid esters
- carboxylic acid aliphatic saturated or unsaturated polycarboxylic acid (C2 to C40, such as oxalic acid, adipic acid, azelaic acid
- a linear or branched polyester polyol formed from Polylactone polyol eg, (substituted) caprolactone (having 6 to 10 carbon atoms, such as ⁇ -caprolactone, ⁇ -Methyl- ⁇ -caprolactone and ⁇ -methyl- ⁇ -caprolactone) is subjected to addition polymerization in the presence of a catalyst (organometallic compound, metal chelate compound, fatty acid metal acyl compound, etc.) (eg, polycaprolactone polyol)];
- a polyether ester polyol obtained by addition-polymerizing AO EO, PO,
- polystyrene polyol examples include polyisobutene polyol and the like.
- polyalkadiene polyol examples include polyisoprene polyol, polybutadiene polyol, hydrogenated polyisoprene polyol and hydrogenated polybutadiene polyol.
- acrylic polyol examples include copolymers of alkyl (meth)acrylate (alkyl having 1 to 30 carbon atoms) ester [butyl (meth)acrylate and the like] and hydroxyl group-containing acrylic monomer [hydroxyethyl (meth)acrylate and the like]. Can be mentioned.
- the average value of the total unsaturations of all the polyol components (A) used in the two-component curable urethane adhesive of the present invention needs to be 0.010 meq/g or less. That is, when a polyol component (A) having a plurality of components is used as one of the main agent and the curing agent, or when a single or a plurality of polyol components (A) is used as both the main agent and the curing agent, the total degree of unsaturation is 0.010 meq. It is possible to use a component of more than 100 g/g, but the average value of the total unsaturation based on all the polyol components (A) used in the main agent and the curing agent needs to be 0.010 meq/g or less.
- the average value of the total unsaturation of all the polyol components (A) used in the two-component curable urethane adhesive is preferably 0.007 meq/g or less, more preferably 0.005 meq/g or less.
- the total degree of unsaturation in the present invention can be measured by the method described in JIS K1557-3.
- the method for reducing the total unsaturation degree of the polyol component (A) is not particularly limited.
- an active hydrogen-containing compound ( a0) is subjected to ring-opening addition polymerization with PO, and the allyl group of the allyl group-containing compound produced by a side reaction during the PO addition reaction is rearranged to a propenyl group in the presence of alkali, and the alkali is removed with an adsorbent.
- a method of hydrolyzing a propenyl group in the presence of an acid to convert it into a hydroxyl group is preferably used.
- the hydroxyl equivalent (Mn per hydroxyl group) of the polyol component (A) in the present invention is preferably 200 or more. Further, the chemical formula amount or Mn of the polyol component (A) needs to be 20,000 or less from the viewpoint of the viscosity of the two-component curable urethane adhesive. Further, the chemical formula amount or Mn of the polyol component (A) is preferably 200 to 12,000, more preferably 500 to 6,000 from the viewpoint of the film strength after curing of the urethane adhesive.
- Examples of the organic polyisocyanate component (B) in the present invention include chain aliphatic polyisocyanates (b1) having 2 to 3 or more isocyanate groups and having 4 to 22 carbon atoms, and alicyclic groups having 8 to 18 carbon atoms. Examples thereof include polyisocyanate (b2), aromatic polyisocyanate having 8 to 26 carbon atoms (b3), araliphatic polyisocyanate having 10 to 18 carbon atoms (b4), and modified products (b5) of these polyisocyanates. As the organic polyisocyanate component (B), one type may be used alone, or two or more types may be used in combination.
- Examples of the chain aliphatic polyisocyanate having 4 to 22 carbon atoms (b1) include ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (hereinafter abbreviated as HDI), dodecamethylene diisocyanate, 1,6,11-undecane triisocyanate.
- Examples of the alicyclic polyisocyanate (b2) having 8 to 18 carbon atoms include isophorone diisocyanate (hereinafter abbreviated as IPDI), 4,4′-dicyclohexylmethane diisocyanate (hereinafter abbreviated as hydrogenated MDI), cyclohexylene diisocyanate, Mention may be made of methylcyclohexylene diisocyanate, bis(2-isocyanatoethyl)-4-cyclohexene-1,2-dicarboxylate and 2,5- or 2,6-norbornane diisocyanate.
- IPDI isophorone diisocyanate
- MDI 4,4′-dicyclohexylmethane diisocyanate
- cyclohexylene diisocyanate Mention may be made of methylcyclohexylene diisocyanate, bis(2-isocyanatoethyl)-4-cyclohexene-1,
- Examples of the aromatic polyisocyanate having 8 to 26 carbon atoms (b3) include 1,3- or 1,4-phenylene diisocyanate, 2,4- or 2,6-tolylene diisocyanate (hereinafter abbreviated as TDI), and crude TDI.
- TDI 1,3- or 1,4-phenylene diisocyanate, 2,4- or 2,6-tolylene diisocyanate
- MDI 4,4'- or 2,4'-diphenylmethane diisocyanate
- crude MDI polyaryl polyisocyanate
- 4,4'-diisocyanatobiphenyl 3,3'-dimethyl-4,4 '-Diisocyanatobiphenyl
- 3,3'-dimethyl-4,4'-diisocyanatodiphenylmethane 1,5-naphthylene diisocyanate
- 4,4',4"-triphenylmethane triisocyanate and m- or p -Isocyanatophenylsulfonyl isocyanate.
- Examples of the araliphatic polyisocyanate having 10 to 18 carbon atoms (b4) include m- or p-xylylene diisocyanate and ⁇ , ⁇ , ⁇ ′, ⁇ ′-tetramethylxylylene diisocyanate.
- modified polyisocyanates (b5) of (b1) to (b4) include modified products of the above polyisocyanates (urethane group, carbodiimide group, alohanate group, urea group, biuret group, uretdione group, uretoimine group, isocyanurate group).
- an oxazolidone group-containing modified product a free isocyanate group content of 8 to 33% by weight, preferably 10 to 30% by weight, particularly 12 to 29% by weight, such as modified MDI (urethane modified MDI, carbodiimide modified MDI and (Trihydrocarbyl phosphate-modified MDI, etc.), urethane-modified TDI, HDI biuret, HDI isocyanurate, and IPDI isocyanurate-modified polyisocyanate.
- modified MDI urethane modified MDI, carbodiimide modified MDI and (Trihydrocarbyl phosphate-modified MDI, etc.
- organic polyisocyanate components (B) from the viewpoint of the hue of the cured product of the two-component curable urethane pressure-sensitive adhesive, a chain aliphatic polyisocyanate (b1) having 4 to 22 carbon atoms and 8 carbon atoms are preferable.
- Alicyclic polyisocyanates (b2) having 18 to 18 and modified products thereof, and more preferred are chain aliphatic polyisocyanates having 4 to 22 carbon atoms (b1) and modified products thereof.
- the chemical formula amount or Mn of the organic polyisocyanate component (B) needs to be 20,000 or less from the viewpoint of the viscosity of the two-component curable urethane adhesive. Further, the chemical formula amount or Mn of the organic polyisocyanate component (B) is preferably 100 to 1,500, and more preferably 150 to 600 from the viewpoint of the film strength after curing of the urethane adhesive.
- the urethane prepolymer (P1) having a hydroxyl group used as the main component of the two-component curable urethane adhesive of the present invention and the urethane prepolymer (P2) having an isocyanate group used as a curing agent are the polyol component (A) and the organic poly It can be obtained by reacting the isocyanate component (B) with a general method.
- the urethane prepolymer (P1) having a hydroxyl group or the urethane prepolymer (P2) having an isocyanate group is prepared. It can be manufactured.
- reaction temperature is preferably 10 to 160° C., more preferably 25 to 160° C. from the viewpoint of reactivity and suppression of thermal deterioration. It is 120° C., and it is preferable to replace the gas phase part with nitrogen from the viewpoint of stability.
- Ratio of equivalent of isocyanate group of organic polyisocyanate component (B) to equivalent of hydroxyl group of polyol component (A) when reacting polyol component (A) and organic polyisocyanate component (B) (equivalent of isocyanate group/hydroxyl group) Is equivalent to 0.3 to 2.5, preferably 0.6 to 2.0, and more preferably 0.9 to 1.5 from the viewpoint of strength and adhesive strength of the resulting urethane adhesive sheet.
- the weight average molecular weight (hereinafter abbreviated as Mw) of the urethane prepolymers (P1) and (P2) in the present invention is 1,000 to 100,000, preferably from the viewpoint of viscosity and strength and adhesive strength of the resulting urethane adhesive sheet. Is 2,000 to 80,000, and more preferably 3,000 to 40,000.
- the Mw in the present invention can be measured by gel permeation chromatography, for example, under the following conditions.
- the sample is a compound having an isocyanate group
- it is measured after sealing the isocyanate group with methanol.
- Device "HLC-8120GPC” [manufactured by Tosoh Corporation]
- Sample solution 0.25 wt% tetrahydrofuran solution solution injection amount: 100 ⁇ l
- Flow rate 1 ml/min
- Measurement temperature 40°C
- Detector Refractive index detector Reference substance: Standard polystyrene
- the two-component curable urethane adhesive of the present invention contains the main agent and the curing agent, and the main agent contains the urethane prepolymer (P1) having a hydroxyl group and/or the polyol component (A), and the curing agent.
- the main agent contains the urethane prepolymer (P1) having a hydroxyl group and/or the polyol component (A), and the curing agent.
- the polyol component (A) used in the urethane prepolymer (P1) having a hydroxyl group and/or the polyol component (A) used as the main component is represented by the above general formula (1) at the molecular end.
- a polyol (A1) having a group and/or a group represented by the general formula (2) is contained, and the ratio of the total number of groups represented by the general formula (1) contained in the polyol (A1) is It is 40% or more on the basis of the total number of groups represented by General Formula (1) and the number of groups represented by General Formula (2) that A1) has. In other words, the following conditions must be met.
- the polyol (A1) is only the polyoxyalkylene polyol (a1)
- the primary hydroxyl group content of the polyoxyalkylene polyol (a1) needs to be at least 40%.
- the mixture must have a primary hydroxyl group content of at least 40%.
- the primary hydroxyl group content of (a1) before the addition of ethylene oxide needs to be at least 40%.
- the content of primary hydroxyl groups in the mixture must be at least 40%.
- the polyol (A1) is a mixture of the polyoxyalkylene polyol (a1) and the ethylene oxide adduct (a2), (a1) before the addition of ethylene oxide of (a2) and the polyol (A1) If it is assumed that a mixture with (a1) contained in () exists, the primary hydroxyl group content of the mixture must be at least 40%.
- the ratio of the total number of groups represented by the general formula (1) in the polyol (A1) is less than 40%, the adhesiveness and the inhibition of cohesive failure of the adhesive at the time of peeling deteriorate. Further, the ratio of the total number of the groups represented by the general formula (1) contained in the polyol (A1) is preferably 60% or more from the viewpoint of adhesiveness and suppression of cohesive failure of the adhesive at the time of peeling. , 70% or more is more preferable.
- the total weight of the main component and the curing agent contained in the two-component curable urethane adhesive of the present invention is 70 to 100 based on the weight of the two-component curable urethane adhesive from the viewpoint of the film strength of the cured product of the adhesive.
- the content is preferably wt%, more preferably 80 to 100 wt%, and particularly preferably 90 to 100 wt%. ..
- the ratio of the total weight of the solvent [excluding the polyol component (A)] contained in the main agent and the solvent [excluding the organic polyisocyanate component (B)] contained in the curing agent in the present invention is VOC reduction. From the viewpoint of and the application to the human body (skin etc.), it is 5% by weight or less, preferably 3% by weight or less, particularly preferably 1% by weight or less, based on the total weight of the main agent and the curing agent. , And most preferably 0% by weight (that is, a two-component curable solventless urethane adhesive).
- the solvent include toluene, xylene, ethyl acetate, butyl acetate, dimethylformamide, acetone, methyl ethyl ketone and tetrahydrofuran.
- the urethane prepolymers (P1) and (P2) in either the main agent or the curing agent, and the urethane prepolymer (P1) in both the main agent and the curing agent.
- P1 and P2 are particularly preferable.
- the average number of functional groups is preferably 2 to 6 (more preferably 2 to 5, particularly preferably 2 to 4) from the viewpoint of curability.
- the most preferred is a biuret body or an isocyanurate body of a chain aliphatic polyisocyanate (b1) having 4 to 22 carbon atoms or an alicyclic polyisocyanate (b2) having 8 to 18 carbon atoms.
- a metal catalyst As the urethanization catalyst, a metal catalyst, an amine catalyst and the like can be mentioned.
- metal catalysts include tin-based catalysts (trimethyltin laurate, trimethyltin hydroxide, dimethyltin dilaurate, dibutyltin diacetate, dibutyltin dilaurate, stannas octoate and dibutyltin maleate), lead-based catalysts (lead oleate).
- amine catalyst examples include triethylenediamine, tetramethylethylenediamine, diazabicycloalkene [1,8-diazabicyclo[5.4.0]undecene-7 [DBU (registered trademark of San-Apro Co., Ltd.)], dialkyl ( C1-C3) aminoalkyl (C2-C4) amine (dimethylaminoethylamine, dimethylaminopropylamine, diethylaminopropylamine, dipropylaminopropylamine, etc.), heterocyclic aminoalkyl (C2-C6) Examples thereof include amines [2-(1-aziridinyl)ethylamine, 4-(1-piperidinyl)-2-hexylamine and the like], N-methyl and N-ethylmorpholine and the like.
- diazabicycloalkenes preferred are diazabicycloalkenes, bismuth-based catalysts, tin-based catalysts and zinc-based catalysts, and particularly preferred are DBU, bismuth carboxylate, dibutyltin dilaurate and organozinc complexes.
- the amount of the urethanization catalyst to be used can be appropriately selected depending on the application, but when high fast curing property is required, it is preferably 3,000 ppm or less, more preferably 1 ppm or less based on the weight of the two-component curable urethane adhesive. ⁇ 2,000 ppm, particularly preferably 10-1,000 ppm.
- the urethanization catalyst may be used alone or in combination of two or more.
- the two-component curable urethane pressure-sensitive adhesive of the present invention is further an antioxidant, an ultraviolet absorber, a plasticizer, a tackifier, a filler, a pigment, an antistatic agent, an anti-gelling agent as long as the effect of the present invention is not impaired.
- Additives such as (urethane retarder) may be contained.
- the additive may be added to either the main agent or the curing agent or may be added at the time of blending the main agent and the curing agent, but it is preferable to add it to the main agent in advance.
- Antioxidants include hindered phenol compounds [triethylene glycol-bis[3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate], pentaerythrityl-tetrakis[3-(3,5 -Di-t-butyl-4-hydroxyphenyl)propionate] and 2,2-thio-diethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], etc.] and phosphorous acid Ester compounds [tris(2,4-di-t-butylphenyl)phosphite, 2,2-methylenebis(4,6-di-t-butylphenyl)octylphosphite, bis(2,6-di-t-) Butylphenyl)pentaerythritol-di-phosphite and tetrakis(2,4-di-t-butylphenyl)4,4′-bipheny
- antioxidants may be used alone or in combination of two or more.
- the amount of the antioxidant used is preferably 5% by weight or less, more preferably 0.05 to 1% by weight, based on the weight of the two-component curable urethane adhesive, from the viewpoint of the antioxidant effect and the adhesive strength.
- ultraviolet absorbers examples include salicylic acid derivatives (phenyl salicylate, salicylate-p-octylphenyl, salicylate-pt-butylphenyl, etc.), benzophenone compounds [2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2 ,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone, 2-hydroxy-4 -Methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone trihydrate, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2,2 ',4,4'-Tetrahydroxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-
- the ultraviolet absorbers may be used alone or in combination of two or more.
- the amount of the ultraviolet absorber used is preferably 5% by weight or less, and more preferably 0.1 to 1% by weight, based on the weight of the two-component curable urethane adhesive, from the viewpoint of the ultraviolet absorption effect and the adhesive strength.
- the plasticizers may be used alone or in combination of two or more.
- the amount of the plasticizer used is preferably 100% by weight or less, more preferably 1 to 50% by weight, particularly preferably 3 to 40% by weight, based on the total weight of the main agent and the curing agent, from the viewpoint of the cohesive strength of the adhesive. It is particularly preferably 5 to 35% by weight, most preferably 10 to 30% by weight.
- tackifier examples include terpene resin, terpene phenol resin, phenol resin, aromatic hydrocarbon modified terpene resin, rosin resin, modified rosin resin, synthetic petroleum resin (aliphatic, aromatic or alicyclic synthetic petroleum resin, etc. ), coumarone-indene resin, xylene resin, styrene resin, dicyclopentadiene resin, and hydrogenated products of these which have a hydrogenatable unsaturated double bond.
- the tackifiers may be used alone or in combination of two or more.
- the amount of the tackifier used is preferably 100% by weight or less, more preferably 1 to 50% by weight, particularly preferably 3 to 40, based on the total weight of the main agent and the curing agent, from the viewpoint of adhesive strength and heat resistance. %, particularly preferably 5 to 35% by weight, most preferably 10 to 30% by weight.
- the filler carbonates (magnesium carbonate and calcium carbonate etc.), sulfates (aluminum sulfate, calcium sulfate and barium sulfate etc.), sulfites (calcium sulfite etc.), molybdenum disulfide, silicates (aluminum silicate and Calcium silicate, etc.), diatomaceous earth, silica stone powder, talc, silica, zeolite and the like.
- the above-mentioned filler is fine particles having a volume average particle diameter of preferably about 0.01 to 5 ⁇ m, and one kind may be used alone or two or more kinds may be used in combination.
- the amount of the filler used is preferably 250% by weight or less, more preferably 0.5 to 100% by weight, from the viewpoint of the cohesive strength of the pressure-sensitive adhesive, based on the total weight of the main agent and the curing agent.
- inorganic pigments alumina white, graphite, titanium oxide, ultrafine particle titanium oxide, zinc white, black iron oxide, mica-like iron oxide, lead white, white carbon, molybdenum white, carbon black, litharge, lithopone, barite, Cadmium red, cadmium mercury red, red iron oxide, molybdenum red, red lead, yellow lead, cadmium yellow, barium yellow, strontium yellow, titanium yellow, titanium black, chromium oxide green, cobalt oxide, cobalt green, cobalt chromium green, ultramarine blue, Dark blue, cobalt blue, cerulean blue, manganese purple and cobalt purple) and organic pigments (shellac, insoluble azo pigment, soluble azo pigment, condensed azo pigment, phthalocyanine blue, dyed lake, etc.).
- the above-mentioned pigments are fine particles having a volume average particle diameter of preferably about 0.01 to 5 ⁇ m, and one kind may be used alone, or two or more kinds may be used in combination.
- the amount of the pigment used is preferably 250% by weight or less, more preferably 0.1 to 50% by weight, based on the total weight of the main agent and the curing agent, from the viewpoint of the cohesive strength of the pressure-sensitive adhesive.
- antistatic agents examples include polyether polyols, surfactants, metallic conductive fillers, carbon black, and quaternary ammonium salts with Mw less than 5,000.
- gelation inhibitor examples include the compound (C) represented by the general formula (6).
- R 1 and R 2 in the general formula (6) each independently represent a hydrocarbon group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a heterocyclic group having 3 to 5 carbon atoms.
- Compound (C) has the effects of preventing gelation due to side reactions during urethane formation, securing a pot life during two-component curing, and shortening curing time during curing.
- the compound (C) one type may be used alone, or two or more types may be used in combination.
- compound (C) examples include 2,4-pentanedione (acetylacetone), 3-methyl-2,4-pentanedione, 2,4-hexanedione and 2,2-dimethyl-3,5-hexanedione.
- the amount of the compound (C) used is appropriately selected according to the desired reaction rate and pot life, but is preferably 0.01 to 5% by weight, more preferably 0 based on the weight of the two-component curable urethane adhesive. 0.03 to 3% by weight, particularly preferably 0.05 to 1% by weight. If it is 0.01% by weight or more, the gelation preventing effect tends to be effectively obtained, and if it is 5% by weight or less, the stain resistance to the adherend due to the bleed-out of the compound (C) can be suppressed. ..
- the NCO/OH ratio (equivalent amount of isocyanate groups to equivalent amount of hydroxyl groups) when mixing the main agent and the curing agent is preferably 0.3 to 2.0, more preferably from the viewpoint of the film strength and adhesive force of the obtained pressure-sensitive adhesive sheet. It is preferably 0.5 to 1.5, particularly preferably 0.7 to 1.3.
- the application of the two-component curable urethane pressure-sensitive adhesive of the present invention is not particularly limited.
- a base material such as a vinyl chloride film or a non-woven fabric and then cured to give a medical adhesive tape or the like.
- a base film such as a polyester film and a polyolefin film and then cured to obtain a pressure-sensitive adhesive sheet, which can be used as a surface protection film or the like by being attached to an optical member.
- the present invention also includes a cured product obtained by curing the two-component curable urethane adhesive of the present invention, and a urethane adhesive sheet containing the cured product of the two-component curable urethane adhesive of the present invention.
- Examples of the method for curing the two-component curable urethane adhesive of the present invention include the following methods.
- the two-component curable urethane adhesive is applied to a substrate (polyethylene terephthalate film, vinyl chloride film, non-woven fabric, etc.) using a bar coater or the like, and allowed to stand at 90 to 130° C. for 1 to 20 minutes to obtain the present invention.
- the two-component curable urethane adhesive can be cured. If necessary, a curing step of standing at 20 to 50° C. for 1 to 10 days may be further carried out.
- Medical adhesive tapes to which the two-component curable urethane adhesive and urethane adhesive sheet are applied include surgical tapes, taping tapes, first-aid bandages, etc.
- the optical member include a polarizing plate, a retardation plate, a light diffusing plate, an antireflection film, an electromagnetic wave shielding film and a glass substrate used in liquid crystal displays, organic EL displays, plasma displays, field emission displays and the like.
- a gravure coater, a reverse roll coater, a comma coater, a spin coater, a curtain coater, a slot coater, a bar coater, a comma coater, a die coater, a knife coater or the like is used for coating the base film with the two-component curable urethane adhesive. be able to.
- the coating amount of the adhesive at the time of coating is preferably 0.5 ⁇ 300g / m 2, more preferably 1 ⁇ 200g / m 2, particularly preferably 10 ⁇ 100g / m 2.
- the coating temperature of the pressure-sensitive adhesive when applied to the substrate film is preferably 10 to 160° C., more preferably 25 to 120° C. from the viewpoint of coatability and suppression of heat deterioration.
- the viscosity is preferably 0.01 to 100 Pa ⁇ s, more preferably 0.02 to 50 Pa ⁇ s from the viewpoints of moldability (thick coating is possible and there is no appearance defect such as warpage and sink mark after curing) and coatability. And particularly preferably 0.03 to 10 Pa ⁇ s.
- the viscosity in this specification is a viscosity measured at 25° C. using a TVB10M type viscometer (manufactured by Toki Sangyo Co., Ltd.). A dry laminator or an extrusion laminator generally used is used for the laminate. After laminating, the adhesive is completely cured by curing at 10 to 50° C. for 20 to 150 hours.
- the urethane group concentration of the cured product of the two-component curable urethane adhesive of the present invention is preferably 5 to 25% by weight based on the total weight of the main agent and the curing agent from the viewpoint of the adhesive strength to the adherend.
- part means “part by weight”.
- a refrigerant at -30°C was circulated in order to condense and collect PO in a condensing facility. Then, after aging at 70° C. for 4 hours, 200 parts of water was added and heated at 130 to 140° C. for 1 hour. After heating for 1 hour, water was distilled off at atmospheric pressure for 2 hours, and then the pressure was maintained at 4 to 7 kPa while continuously introducing steam, and the remaining water and by-product low boiling point compounds were distilled under reduced pressure over 3 hours. Left. Subsequently, 12 parts of high-purity potassium hydroxide (purity 96%) was added, and the mixture was stirred at 130° C. under reduced pressure to uniformly dissolve and dehydrate.
- the temperature is raised and the mixture is heated at 155 to 165° C. for 20 hours to rearrange the allyl group of the allyl group-containing compound generated by the side reaction during the PO addition reaction into a propenyl group, and after cooling to 85 to 90° C. , 40 parts of water was added and mixed at 85 to 90° C. for 30 minutes, then 40 parts of Kyoward 600 [Kyowa Chemical Industry Co., Ltd.] as an adsorbent was added and mixed at the same temperature for 30 minutes, and then filtered. The adsorbent was removed. Next, phosphoric acid and water were added to adjust the pH to 4.0, the temperature was raised, and the mixture was heated at 150° C.
- the hydroxyl value of (a1-1) was 36 mgKOH/g, Mn was 4,700, the viscosity was 1,000 mPa ⁇ s/25° C., the degree of primary conversion was 70%, and the degree of unsaturation was 0.006 meq/g. ..
- the hydroxyl value of (a1-2) was 35 mgKOH/g, Mn was 4,800, the viscosity was 900 mPa ⁇ s/25° C., the degree of primary conversion was 60%, and the degree of unsaturation was 0.006 meq/g.
- a refrigerant at -30°C was circulated in order to condense and collect PO in a condensing facility. Then, after aging at 70° C. for 4 hours, 200 parts of water was added and heated at 130 to 140° C. for 1 hour. After heating for 1 hour, water was distilled off at atmospheric pressure for 2 hours, and then the pressure was maintained at 4 to 7 kPa while continuously introducing steam, and the remaining water and by-product low boiling point compounds were distilled under reduced pressure over 3 hours. Left. After that, 30 parts of synthetic silicate [“Kyoward 600” manufactured by Kyowa Chemical Industry Co., Ltd.] and 40 parts of water were added, stirred at 60° C.
- polyoxyalkylene polyol (a1-3) was 112 mgKOH/g, Mn was 1,000, the viscosity was 200 mPa ⁇ s/25° C., the degree of primary conversion was 70%, and the degree of unsaturation was 0.010 meq/g.
- a refrigerant at -30°C was circulated in order to condense and collect PO in a condensing facility. Then, after aging at 70° C. for 4 hours, 200 parts of water was added and heated at 130 to 140° C. for 1 hour. After heating for 1 hour, water was distilled off at atmospheric pressure for 2 hours, and then the pressure was maintained at 4 to 7 kPa while continuously introducing steam, and the remaining water and by-product low boiling point compounds were distilled under reduced pressure over 3 hours. Left. After that, 30 parts of synthetic silicate [“Kyoward 600” manufactured by Kyowa Chemical Industry Co., Ltd.] and 40 parts of water were added, stirred at 60° C.
- polyoxyalkylene polyol (a1-4).
- the hydroxyl value of (a1-4) was 34 mgKOH/g, Mn was 5,000, the viscosity was 900 mPa ⁇ s/25° C., the degree of primary conversion was 72%, and the degree of unsaturation was 0.06 meq/g.
- polyoxyalkylene polyol (a1-5).
- the hydroxyl value of (a1-5) was 112 mgKOH/g, Mn was 1,000, the viscosity was 150 mPa ⁇ s/25° C., the degree of primary conversion was 2%, and the degree of unsaturation was 0.010 meq/g.
- polyoxyalkylene polyol (a1-6).
- the hydroxyl value of (a1-6) was 188 mgKOH/g, Mn was 600, the viscosity was 85 mPa ⁇ s/25° C., the degree of primary conversion was 2%, and the degree of unsaturation was 0.010 meq/g.
- a polyoxyalkylene polyol (a1-7) was obtained in the same manner as in Production Example 1 except that 4.0 parts of potassium hydroxide was added instead of 0.09 part of TPB.
- the hydroxyl value of (a1-7) was 35 mgKOH/g, Mn was 4,800, the viscosity was 1050 mPa ⁇ s/25° C., the degree of primary conversion was 2%, and the degree of unsaturation was 0.006 meq/g.
- a polyoxyalkylene polyol (a2-2) was obtained in the same manner as in Production Example 1, except that 270 parts of EO was further added after PO was added.
- the hydroxyl value of (a2-2) was 33 mgKOH/g, Mn was 5,100, the viscosity was 1050 mPa ⁇ s/25° C., and the degree of unsaturation was 0.007 meq/g.
- a2-3) After taking it out from the autoclave, it was filtered through a 1-micron filter and dehydrated for 2 hours to obtain a polyoxyalkylene polyol (a2-3).
- the hydroxyl value of (a2-3) was 29 mgKOH/g, Mn was 5,800, the viscosity was 1100 mPa ⁇ s/25° C., and the degree of unsaturation was 0.05 meq/g.
- the hydroxyl value of the urethane prepolymer (P1-2) was 28 mgKOH/g, the viscosity was 23,000 mPa ⁇ s/25° C., and the Mw was 21,000.
- the hydroxyl value of the urethane prepolymer (P1-3) was 24 mgKOH/g, the viscosity was 17,000 mPa ⁇ s/25° C., and the Mw was 18,000.
- the hydroxyl value of the urethane prepolymer (P1-4) was 23 mgKOH/g, the viscosity was 19,000 mPa ⁇ s/25° C., and the Mw was 20,000.
- the hydroxyl value of the urethane prepolymer (P1-5) was 24 mgKOH/g, the viscosity was 15,000 mPa ⁇ s/25° C., and the Mw was 19,000.
- the urethane prepolymer (P2-2) had an isocyanate group content of 3.1%, a viscosity of 9,000 mPa ⁇ s/25° C., and an Mw of 4,500.
- the hydroxyl value of the urethane prepolymer (P1′-1) was 24 mgKOH/g, the viscosity was 15,000 mPa ⁇ s/25° C., and the Mw was 15,000.
- the hydroxyl value of the urethane prepolymer (P1′-4) was 29 mgKOH/g, the viscosity was 20,000 mPa ⁇ s/25° C., and the Mw was 19,000.
- the hydroxyl value of the urethane prepolymer (P1′-5) was 24 mgKOH/g, the viscosity was 16,000 mPa ⁇ s/25° C., and the Mw was 18,000.
- the polyol component (A) contains the polyol (A1) in which the ratio of the total number of the groups represented by the general formula (1) is 40% or more, and the average value of the total unsaturation degree. Is 0.010 meq/g or less, the urethane pressure-sensitive adhesive sheet of the example shows excellent peeling state and film strength as compared with the urethane pressure-sensitive adhesive sheet of the comparative example which does not satisfy these conditions, and the initial pressure-sensitive adhesive strength and the pressure-sensitive adhesive after the heat and humidity test. The difference in power is small.
- the two-component curable urethane adhesive of the present invention is used for skin application, for example, as a pressure-sensitive adhesive for laminating various optical members such as a surgical tape and a plaster, a polarizing plate, a retardation plate and a light diffusion plate, and a glass substrate. It is extremely useful because it can be used in a wide variety of applications such as various image display devices such as liquid crystal displays, organic EL displays, plasma displays and field emission displays.
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Abstract
Description
しかしながら、特許文献1に開示されているウレタン粘着剤では、粘着シートの強度を発現させるためには硬化剤を多用したり、架橋点を増やしたりしなければならず、粘着力や柔軟性が劣り、得られる粘着剤の硬化膜が脆くなったりする等の問題点があった。
また、最近は環境対応(VOC低減)のため、溶剤を実質的に含有しないウレタン粘着剤が好まれる傾向がある。また、ウレタン粘着剤を人体(肌等)に用いる場合にも、溶剤を実質的に含有しないウレタン粘着剤が好まれる傾向がある。
しかし、硬化膜の物性を向上させるためには、プレポリマーの分子量を上げることが望ましく、その結果、粘度が高くなりハンドリングが悪くなる等の問題があるため、有機溶剤を併用することが多い。
(1)水酸基を有するウレタンプレポリマー(P1)に用いられるポリオール成分(A)及び/又は主剤として用いられるポリオール成分(A)が、分子末端に一般式(1)で表される基及び/又は一般式(2)で表される基を有するポリオール(A1)を含有し、ポリオール(A1)が有する一般式(1)で表される基の合計個数の割合が、ポリオール(A1)が有する一般式(1)で表される基の個数及び一般式(2)で表される基の個数の合計を基準として40%以上である。
(2)2液硬化性ウレタン粘着剤に用いられる全てのポリオール成分(A)の総不飽和度の平均値が0.010meq/g以下である。
(3)ウレタンプレポリマー(P1)及びウレタンプレポリマー(P2)の重量平均分子量が、1,000~100,000である。
(4)ポリオール成分(A)及び有機ポリイソシアネート成分(B)の化学式量又は数平均分子量が、20,000以下である。
(5)主剤が含有する溶剤[但し、ポリオール成分(A)を除く]及び硬化剤が含有する溶剤[但し、有機ポリイソシアネート成分(B)を除く]の合計重量の割合が、主剤及び硬化剤の合計重量を基準として、5重量%以下である。
また、水酸基を有するウレタンプレポリマー(P1)に用いられるポリオール成分(A)及び/又は主剤として用いられるポリオール成分(A)は、分子末端に上記一般式(1)で表される基及び/又は上記一般式(2)で表される基を有するポリオール(A1)を含有する。
また、ポリオール(A1)が有する一般式(1)で表される基の合計個数の割合は、ポリオール(A1)が有する一般式(1)で表される基の個数及び一般式(2)で表される基の個数の合計を基準として40%以上である。
一般式(1)及び(2)において、aはそれぞれ独立に0以上の整数である。
また、上記の分子末端にヒドロキシプロピル基を有するポリオキシアルキレンポリオール(a1)としては、例えば一般式(3)で表される化合物等が挙げられる。
水酸基当量が160以下であり水酸基を2個以上有する化合物〔水酸基を2個以上有する脂肪族化合物[炭素数2~20の脂肪族2価アルコール{アルキレングリコール(例えばエチレングリコール、プロピレングリコール、1,3-ブチレングリコール、1,4-ブタンジオール、1,6-ヘキサンジオール、3-メチルペンタンジオール、ネオペンチルグリコール及び1,9-ノナンジオール等)};炭素数3~8の3~8価又はそれ以上の多価アルコール(グリセリン、トリメチロールプロパン、ペンタエリスリトール、ソルビトール、キシリトール及びマンニトール等);これらの分子間又は分子内脱水物{例えばジペンタエリスリトール、ポリグリセリン(重合度2~20)及びソルビタン};糖類及びその誘導体(グリコキシド等){例えばグルコース、フルクトース、ショ糖及びα-メチルグルコシド等};炭素数6~15の(ビ)シクロアルキレンジオール{例えば1,4-ジヒドロキシシクロヘキサン、1,4-ビス(ヒドロキシメチル)シクロヘキサン及び2,2-ビス(4,4’-ヒドロキシシクロヘキシル)プロパン等}];炭素数8~15の芳香環含有多価アルコール[m-又はp-キシリレングリコール及び1,4-ビス(ヒドロキシエチル)ベンゼン等]等〕;
ヒマシ油系ポリオール(ヒマシ油、部分脱水ヒマシ油及び部分アシル化ヒマシ油等);
m個の水酸基を有する数平均分子量(以下、Mnと略記)2,000以下のポリマー又はオリゴマー[ポリアルカジエン(炭素数4~10)ポリオール(例えばポリブタジエンポリオール及びその水添物);ヒドロキシアルキル(炭素数2~4)(メタ)アクリレートの(共)重合体;ポリビニルアルコール(鹸化度60%以上)等];
多価フェノール類[単環多価フェノール類(ピロガロール、カテコール及びヒドロキノン等)、ビスフェノール類(ビスフェノールA、ビスフェノールF及びビスフェノールS等)等];
リン酸化合物(燐酸、亜燐酸及びホスホン酸等);
及びこれらの2種以上の混合物等が挙げられる。
装置:「Waters Alliance 2695」[Waters社製]
カラム:「Guardcolumn Super H-L」(1本)、「TSKgel SuperH2000、TSKgel SuperH3000、TSKgel SuperH4000(いずれも東ソー株式会社製)を各1本連結したもの」
試料溶液:0.25重量%のテトラヒドロフラン溶液
溶液注入量:10μl
流量:0.6ml/分
測定温度:40℃
検出装置:屈折率検出器
基準物質:標準ポリエチレングリコール
1級モノアミン[炭素数1~20のモノ(シクロ)アルキルアミン類(メチルアミン、エチルアミン、ブチルアミン、オクチルアミン、ドデシルアミン及びシクロヘキシルアミン等)、炭素数6~12の芳香族及び芳香脂肪族モノアミン(アニリン、トルイジン及びベンジルアミン等)等];
活性水素を2個以上有するポリアミン類[炭素数2~12又はそれ以上の脂肪族ジアミン{例えばエチレンジアミン、プロピレンジアミン、ヘキサメチレンジアミン及びモノ-又はジ-アルキル(炭素数1~4)アルキレンジアミン(ジメチルプロピレンジアミン等)等のアルキレンジアミン}、炭素数6~15の脂環式ジアミン(1,4-ジアミノシクロヘキサン、イソホロンジアミン及び4,4’-ジアミノシクロヘキシルメタン等)、炭素数6~15の芳香族ジアミン{m-又はp-フェニレンジアミン、トリレンジアミン、ジエチルトルエンジアミン、4,4’-ジアミノフェニルメタン及び2,2-ビス(4,4’-ジアミノフェニル)プロパン等}、炭素数8~15の芳香脂肪族ジアミン(m-又はp-キシリレンジアミン等)、炭素数4~10の複素環式ポリアミン{ピペラリジン、アミノアルキル(炭素数2~4)ピペラジン(例えばアミノエチルピペラジン)、アミノアルキル(炭素数2~4)イミダゾール等}、アルキレン基の炭素数2~4のポリアルキレンポリアミン{ジエチレントリアミン、ジプロピレントリアミン、トリエチレンテトラミン、Mnが2,000以下のポリエチレンイミン及びモノ-、ジ-又はトリ-アルキル(炭素数1~4)ポリアルキレンポリアミン(例えばジメチルジプロピレントリアミン等)}等];
ヒドロキシアルキル基の炭素数2~4のモノ-又はジ-アルカノールアミン(モノエタノールアミン、モノイソプロパノールアミン、ジエタノールアミン及びジイソプロパノールアミン等);
アミノ基を1個又は2個以上有するMnが2,000以下のポリマー又はオリゴマー[アミノアルキル(炭素数2~4)(メタ)アクリレート(共)重合体及びポリエーテル(ポリ)アミン(ポリオキシプロピレンジアミン及びポリオキシプロピレントリアミン等)等];
及びこれらの2種以上の混合物等が挙げられる。
<試料調製法>
測定試料約30mgを直径5mmのNMR用試料管に秤量し、約0.5mlの重水素化溶媒を加え溶解する。その後、約0.1mlの無水トリフルオロ酢酸を添加し分析用試料とする。上記重水素化溶媒としては、例えば、重水素化クロロホルム、重水素化トルエン、重水素化ジメチルスルホキシド及び重水素化ジメチルホルムアミド等から、試料を溶解させることのできる溶媒を適宜選択する。
<NMR測定>
一般的な条件で1H-NMR測定を行う。
<1級化率の計算方法>
上に述べた前処理の方法により、ポリオキシアルキレンポリオールの末端の水酸基は、添加した無水トリフルオロ酢酸と反応してトリフルオロ酢酸エステルとなる。その結果、1級水酸基が結合したメチレン基由来の信号は4.3ppm付近に観測され、2級水酸基が結合したメチン基由来の信号は5.2ppm付近に観測される。1級化率は次の計算式により算出する。
1級化率(%)=[x/(x+2×y)]×100[但し、xは4.3ppm付近の1級水酸基の結合したメチレン基由来の信号の積分値であり、yは5.2ppm付近の2級水酸基の結合したメチン基由来の信号の積分値である。]
比較的高分子量(水酸基価400mgKOH/g未満)の他のポリオールと併用する場合には、比較的高い水酸基価例えば400~1,500mgKOH/g、特に450~1,200mgKOH/gのものが好ましい。水酸基価は、JIS K1557-1に記載の方法により測定することができる。
ヒマシ油脂肪酸エステルポリオール(例えばヒマシ油、部分脱水ヒマシ油及びヒマシ油脂肪酸エステル);
ポリ(n=2~3又はそれ以上)カルボン酸[脂肪族飽和又は不飽和ポリカルボン酸(炭素数2~40、例えばシュウ酸、アジピン酸、アゼライン酸、ドデカン酸、マレイン酸、フマル酸、イタコン酸及び二量化リノール酸)、芳香環含有ポリカルボン酸(炭素数8~15、例えばフタル酸、イソフタル酸、テレフタル酸及び2,6-ナフタレンジカルボン酸)及び脂環含有ポリカルボン酸(炭素数7~15、例えば1,3-ペンタンジカルボン酸及び1,4-ヘキサンジカルボン酸)等]とポリオール[例えば上記水酸基含有化合物、ポリオキシアルキレンポリオール(a1)、そのEO付加物(a2)及びその他のポリオール(a3)等]から形成される線状又は分岐状ポリエステルポリオール;
ポリラクトンポリオール[例えば上記水酸基含有化合物(2~3価のもの等)の1種又は2種以上の混合物を開始剤としてこれに(置換)カプロラクトン(炭素数6~10、例えばε-カプロラクトン、α-メチル-ε-カプロラクトン及びε-メチル-ε-カプロラクトン)を触媒(有機金属化合物、金属キレート化合物及び脂肪酸金属アシル化合物等)の存在下に付加重合させたポリオール(例えばポリカプロラクトンポリオール)];
末端にカルボキシル基及び/又は水酸基を有するポリエステルにAO(EO及びPO等)を付加重合させて得られるポリエーテルエステルポリオールであって、ポリオキシアルキレンポリオール(a1)にも、そのEO付加物(a2)にも該当しないもの;
ポリカーボネートポリオール等が挙げられる。
ポリアルカジエンポリオールとしては、ポリイソプレンポリオール、ポリブタジエンポリオール、水添化ポリイソプレンポリオール及び水添化ポリブタジエンポリオール等が挙げられる。
2液硬化性ウレタン粘着剤に用いられる全てのポリオール成分(A)の総不飽和度の平均値は、好ましくは0.007meq/g以下、更に好ましくは0.005meq/g以下である。
本発明における総不飽和度は、JIS K1557-3に記載の方法により測定することができる。
また、ポリオール成分(A)の化学式量又はMnは2液硬化性ウレタン粘着剤の粘度の観点から20,000以下である必要がある。また、ポリオール成分(A)の化学式量又はMnは、ウレタン粘着剤の硬化後の膜強度の観点から、200~12,000であることが好ましく、500~6,000であることが更に好ましい。
また、有機ポリイソシアネート成分(B)の化学式量又はMnは、ウレタン粘着剤の硬化後の膜強度の観点から、100~1,500であることが好ましく、150~600であることが更に好ましい。
装置:「HLC-8120GPC」[東ソー(株)製]
カラム:「Guardcolumn HXL-H」(1本)、「TSKgel GMHXL」(2本)[いずれも東ソー(株)製]
試料溶液:0.25重量%のテトラヒドロフラン溶液
溶液注入量:100μl
流量:1ml/分
測定温度:40℃
検出装置:屈折率検出器
基準物質:標準ポリスチレン
そして、上述の通り、水酸基を有するウレタンプレポリマー(P1)に用いられるポリオール成分(A)及び/又は主剤として用いられるポリオール成分(A)は、分子末端に上記一般式(1)で表される基及び/又は上記一般式(2)で表される基を有するポリオール(A1)を含有し、ポリオール(A1)が有する一般式(1)で表される基の合計個数の割合が、ポリオール(A1)が有する一般式(1)で表される基の個数及び一般式(2)で表される基の個数の合計を基準として40%以上である。言い換えると、以下の条件を満たす必要がある。
上記ポリオール(A1)が、上記ポリオキシアルキレンポリオール(a1)のみである場合は、ポリオキシアルキレンポリオール(a1)の1級水酸基含有率が少なくとも40%である必要がある。ポリオキシアルキレンポリオール(a1)が2種以上の場合は、その混合物の1級水酸基含有率が少なくとも40%である必要がある。
また、上記ポリオール(A1)が、上記エチレンオキサイド付加物(a2)のみである場合は、エチレンオキサイド付加前の(a1)の1級水酸基含有率が少なくとも40%である必要がある。エチレンオキサイド付加前の(a1)が2種以上の場合は、その混合物の1級水酸基含有率が少なくとも40%である必要がある。
また、上記ポリオール(A1)が、上記ポリオキシアルキレンポリオール(a1)とエチレンオキサイド付加物(a2)との混合物である場合は、(a2)のエチレンオキサイド付加前の(a1)と、ポリオール(A1)が含有する(a1)との混合物が存在すると仮定した場合に、その混合物の1級水酸基含有率が少なくとも40%である必要がある。
上記溶剤としては、トルエン、キシレン、酢酸エチル、酢酸ブチル、ジメチルホルムアミド、アセトン、メチルエチルケトン及びテトラヒドロフラン等が挙げられる。
これらの内、粘着力の観点から極性を有するものが好ましく、ロジン樹脂、フェノール樹脂、テルペンフェノール樹脂、キシレン樹脂及びこれらの水素添加物が更に好ましく、テルペンフェノール樹脂及びその水素添加物が特に好ましい。粘着性付与剤の使用量は、主剤及び硬化剤の合計重量に基づいて、粘着力及び耐熱性の観点から好ましくは100重量%以下、更に好ましくは1~50重量%、特に好ましくは3~40重量%、とりわけ好ましくは5~35重量%、最も好ましくは10~30重量%である。
2液硬化性ウレタン粘着剤を、バーコーター等を用いて基材(ポリエチレンテレフタレートフィルム、塩ビフィルム及び不織布等)に塗工し、90~130℃で1~20分静置することで、本発明の2液硬化性ウレタン粘着剤を硬化させることができる。
必要に応じて、更に20~50℃で1~10日静置する養生工程を実施しても良い。
基材フィルムへの2液硬化性ウレタン粘着剤のコーティングには、グラビアコーター、リバースロールコーター、コンマコーター、スピンコーター、カーテンコーター、スロットコーター、バーコーター、コンマコーター、ダイコーター又はナイフコーター等を用いることができる。コーティング時の粘着剤の塗布量(固形分)は好ましくは0.5~300g/m2、更に好ましくは1~200g/m2、特に好ましくは10~100g/m2である。
なお、本明細書における粘度は、TVB10M形粘度計(東機産業(株)製)を用いて、25℃で測定される粘度である。
ラミネートには一般的に使用されるドライラミネーター又はエクストルージョンラミネーターが用いられる。ラミネート後、10~50℃で20~150時間養生することにより粘着剤が完全硬化する。
<製造例1>
撹拌装置、温度制御装置、凝縮設備としての熱交換器、原料供給ライン及び排気ラインを備えたステンレス製オートクレーブに、グリセリンのPO付加物[三洋化成工業(株)製「サンニックスGP-1500」:1級化率=2%、水酸基価=112mgKOH/g]510部とTPB0.09部を仕込んだ後撹拌を開始して、オートクレーブと凝縮設備内を0.005MPaまで減圧した。原料供給ラインを通じてPO1,190部を、反応温度を70~80℃に保つように制御しながら12時間かけて連続的に液相に投入した。凝縮設備でPOを凝縮し回収するため-30℃の冷媒を循環させた。続いて70℃で4時間熟成した後、水200部を加えて130~140℃で1時間加熱した。1時間加熱後、水を2時間かけて常圧留去した後、引き続いてスチームを通入しながら圧力を4~7kPaに保ち、3時間かけて残りの水及び副生低沸点化合物を減圧留去した。続いて高純度水酸化カリウム(純度96%)12部を加えて、130℃で減圧下に撹拌して均一に溶解、脱水した。続いて昇温し、155~165℃で20時間加熱することにより、PO付加反応時の副反応により生じたアリル基含有化合物のアリル基をプロペニル基へ転位させ、85~90℃まで冷却した後、水40部を加えて85~90℃で30分混合し、次いで吸着剤としてのキョーワード600[協和化学工業(株)製]40部を加えて同温度で30分混合した後、ろ過により吸着剤を取り除いた。次いで、リン酸及び水を添加しpH4.0に調整後、昇温し、150℃で5時間加熱することにより、プロペニル基を加水分解させて水酸基に変換した。続いて110~130℃まで冷却し、減圧脱水した後、90℃まで冷却し、吸着剤としてのキョーワード1000(協和化学工業(株)製)を40部加えて同温度で30分混合した後、ろ過により吸着剤を取り除いて、ポリオキシアルキレンポリオール(a1-1)を得た。(a1-1)の水酸基価は36mgKOH/g、Mnは4,700、粘度は1,000mPa・s/25℃、1級化率は70%、不飽和度は0.006meq/gであった。
製造例1におけるグリセリンのPO付加物「サンニックスGP-1500」510部をグリセリンのPO付加物[三洋化成工業(株)製「サンニックスGH-5000」:1級化率=2%、水酸基価=33mgKOH/g]966部に代えて、POの仕込量を34部に代える以外は製造例1と同様にしてポリオキシアルキレンポリオール(a1-2)を得た。(a1-2)の水酸基価は35mgKOH/g、Mnは4,800、粘度は900mPa・s/25℃、1級化率は60%、不飽和度は0.006meq/gであった。
撹拌装置、温度制御装置、凝縮設備としての熱交換器、原料供給ライン及び排気ラインを備えたステンレス製オートクレーブに、プロピレングリコールのPO付加物[三洋化成工業(株)製「サンニックスPP-400」:1級化率=2%、水酸基価=280mgKOH/g]400部とTPB0.09部を仕込んだ後撹拌を開始して、オートクレーブと凝縮設備内を0.005MPaまで減圧した。原料供給ラインを通じてPO600部を、反応温度を70~80℃に保つように制御しながら12時間かけて連続的に液相に投入した。凝縮設備でPOを凝縮し回収するため-30℃の冷媒を循環させた。続いて70℃で4時間熟成した後、水200部を加えて130~140℃で1時間加熱した。1時間加熱後、水を2時間かけて常圧留去した後、引き続いてスチームを通入しながら圧力を4~7kPaに保ち、3時間かけて残りの水及び副生低沸点化合物を減圧留去した。その後30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間攪拌し、オートクレーブから取り出した後、1ミクロンのフィルターで濾過した後脱水し、ポリオキシアルキレンポリオール(a1-3)を得た。(a1-3)の水酸基価は112mgKOH/g、Mnは1,000、粘度は200mPa・s/25℃、1級化率は70%、不飽和度は0.010meq/gであった。
撹拌装置、温度制御装置、凝縮設備としての熱交換器、原料供給ライン及び排気ラインを備えたステンレス製オートクレーブに、グリセリンのPO付加物[三洋化成工業(株)製「サンニックスGP-1500」:1級化率=2%、水酸基価=112mgKOH/g]510部とTPB0.09部を仕込んだ後撹拌を開始して、オートクレーブと凝縮設備内を0.005MPaまで減圧した。原料供給ラインを通じてPO1,190部を、反応温度を70~80℃に保つように制御しながら12時間かけて連続的に液相に投入した。凝縮設備でPOを凝縮し回収するため-30℃の冷媒を循環させた。続いて70℃で4時間熟成した後、水200部を加えて130~140℃で1時間加熱した。1時間加熱後、水を2時間かけて常圧留去した後、引き続いてスチームを通入しながら圧力を4~7kPaに保ち、3時間かけて残りの水及び副生低沸点化合物を減圧留去した。その後30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間攪拌し、オートクレーブから取り出した後、1ミクロンのフィルターで濾過した後脱水し、ポリオキシアルキレンポリオール(a1-4)を得た。(a1-4)の水酸基価は34mgKOH/g、Mnは5,000、粘度は900mPa・s/25℃、1級化率は72%、不飽和度は0.06meq/gであった。
プロピレングリコールのPO付加物[三洋化成工業(株)製「サンニックスPP-400」:1級化率=2%、水酸基価=280mgKOH/g]400部と水酸化カリウム4.0部を仕込んだ後、原料供給ラインを通じてPO600部を反応温度が90~100℃を保つように制御しながら連続的に液相に投入した。続いて100℃で3時間熟成した後、30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間処理し、オートクレーブから取り出した後、1ミクロンのフィルターで濾過した後脱水し、ポリオキシアルキレンポリオール(a1-5)を得た。(a1-5)の水酸基価は112mgKOH/g、Mnは1,000、粘度は150mPa・s/25℃、1級化率は2%、不飽和度は0.010meq/gであった。
プロピレングリコールのPO付加物[三洋化成工業(株)製「サンニックスPP-400」:1級化率=2%、水酸基価=280mgKOH/g]670部と水酸化カリウム4.0部を仕込んだ後、原料供給ラインを通じてPO330部を反応温度が90~100℃を保つように制御しながら連続的に液相に投入した。続いて100℃で3時間熟成した後、30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間処理し、オートクレーブから取り出した後、1ミクロンのフィルターで濾過した後脱水し、ポリオキシアルキレンポリオール(a1-6)を得た。(a1-6)の水酸基価は188mgKOH/g、Mnは600、粘度は85mPa・s/25℃、1級化率は2%、不飽和度は0.010meq/gであった。
製造例1において、TPB0.09部の代わりに水酸化カリウム4.0部を加える以外は製造例1と同様にしてポリオキシアルキレンポリオール(a1-7)を得た。(a1-7)の水酸基価は35mgKOH/g、Mnは4,800、粘度は1050mPa・s/25℃、1級化率は2%、不飽和度は0.006meq/gであった。
グリセリンのPO付加物[三洋化成工業(株)製「サンニックスGP-600」:1級化率=2%、水酸基価=280mgKOH/g]120部と水酸化カリウム4.0部を仕込んだ後、原料供給ラインを通じてPO740部を反応温度が90~100℃を保つように制御しながら連続的に液相に投入した。この時点での1級化率は2%であった。続いてEO140部を投入し、100℃で3時間熟成した後、30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間処理し、オートクレーブから取り出した後、1ミクロンのフィルターで濾過した後脱水し、ポリオキシアルキレンポリオール(a2-1)を得た。(a2-1)の水酸基価は33mgKOH/g、Mnは5,100、粘度は900mPa・s/25℃、不飽和度は0.08meq/gであった。
製造例1において、PO投入後、更にEO270部を投入する以外は製造例1と同様にしてポリオキシアルキレンポリオール(a2-2)を得た。(a2-2)の水酸基価は33mgKOH/g、Mnは5,100、粘度は1050mPa・s/25℃、不飽和度は0.007meq/gであった。
合成珪酸塩と水を加える前までは製造例8と同様に操作してポリオキシアルキレンポリオールを得た。続いて、水酸化カリウム4.0部を加えて原料供給ラインを通じてEO270部を反応温度が130~140℃を保つように制御しながら6時間かけて投入した。続いて130~140℃で3時間熟成した。次に、30部の合成珪酸塩[協和化学工業(株)製「キョーワード600」]と水40部を加えて60℃で3時間攪拌した。オートクレーブより取り出した後、1ミクロンのフィルターで濾過した後2時間脱水し、ポリオキシアルキレンポリオール(a2-3)を得た。(a2-3)の水酸基価は29mgKOH/g、Mnは5,800、粘度は1100mPa・s/25℃、不飽和度は0.05meq/gであった。
<製造例11>
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例1で得られたポリオキシアルキレンポリオール(a1-1)504.3g、製造例3で得られたポリオキシアルキレンポリオール(a1-3)432.3g、マロン酸ジエチル0.5g及びHDI{ヘキサメチレンジイソシアネート(デュラネート50M;旭化成(株)製)}63.4gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1-1)を得た。ウレタンプレポリマー(P1-1)の水酸基価は24mgKOH/g、粘度は16,000mPa・s/25℃、Mwは18,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例1で得られたポリオキシアルキレンポリオール(a1-1)525.2g、製造例3で得られたポリオキシアルキレンポリオール(a1-3)253.2g、製造例6で得られたポリオキシアルキレンポリオール(a1-6)150.9g、マロン酸ジエチル0.5g及びHDI70.8gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1-2)を得た。ウレタンプレポリマー(P1-2)の水酸基価は28mgKOH/g、粘度は、23,000mPa・s/25℃、Mwは21,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例2で得られたポリオキシアルキレンポリオール(a1-2)511.4g、製造例3で得られたポリオキシアルキレンポリオール(a1-3)426.1g、マロン酸ジエチル0.5g及びHDI62.5gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1-3)を得た。ウレタンプレポリマー(P1-3)の水酸基価は24mgKOH/g、粘度は、17,000mPa・s/25℃、Mwは18,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例3で得られたポリオキシアルキレンポリオール(a1-3)413.3g、製造例9で得られたポリオキシアルキレンポリオール(a2-2)526.0g、マロン酸ジエチル0.5g及びHDI60.7gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1-4)を得た。ウレタンプレポリマー(P1-4)の水酸基価は23mgKOH/g、粘度は、19,000mPa・s/25℃、Mwは20,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例1で得られたポリオキシアルキレンポリオール(a1-1)494.5g、製造例3で得られたポリオキシアルキレンポリオール(a1-3)423.8g、マロン酸ジエチル0.5g及びIPDI(イソホロンジイソシアネート)81.7gを投入し、120℃で10時間反応させて水酸基末端ウレタンプレポリマー(P1-5)を得た。ウレタンプレポリマー(P1-5)の水酸基価は24mgKOH/g、粘度は15,000mPa・s/25℃、Mwは19,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例5で得られたポリオキシアルキレンポリオール(a1-5)799.0g、マロン酸ジエチル0.5g、HDI201.0gを投入し、120℃で6時間反応させてイソシアネート基末端ウレタンプレポリマー(P2-1)を得た。ウレタンプレポリマー(P2-1)のイソシアネート基含量は3.4%、粘度は、10,000mPa・s/25℃、Mwは4,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例5で得られたポリオキシアルキレンポリオール(a1-5)750.3g、マロン酸ジエチル0.5g、IPDI(イソホロンジイソシアネート)249.7gを投入し、120℃で7時間反応させてイソシアネート基末端ウレタンプレポリマー(P2-2)を得た。ウレタンプレポリマー(P2-2)のイソシアネート基含量は3.1%、粘度は、9,000mPa・s/25℃、Mwは4,500であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例4で得られたポリオキシアルキレンポリオール(a1-4)518.6g、製造例5で得られたポリオキシアルキレンポリオール(a1-5)419.8g、マロン酸ジエチル0.5g及びHDI61.6gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1’-1)を得た。ウレタンプレポリマー(P1’-1)の水酸基価は24mgKOH/g、粘度は、15,000mPa・s/25℃、Mwは15,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例4で得られたポリオキシアルキレンポリオール(a1-4)539.4g、製造例5で得られたポリオキシアルキレンポリオール(a1-5)245.6g、製造例6で得られたポリオキシアルキレンポリオール(a1-6)146.3g、マロン酸ジエチル0.5g及びHDI68.7gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1’-2)を得た。ウレタンプレポリマー(P1’-2)の水酸基価は28mgKOH/g、粘度は、18,000mPa・s/25℃、Mwは18,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例5で得られたポリオキシアルキレンポリオール(a1-5)413.3g、製造例8で得られたポリオキシアルキレンポリオール(a2-1)526.0g、マロン酸ジエチル0.5g及びHDI60.7gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1’-3)を得た。ウレタンプレポリマー(P1’-3)の水酸基価は23mgKOH/g、粘度は、13,500mPa・s/25℃、Mwは12,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例6で得られたポリオキシアルキレンポリオール(a1-6)307.1g、製造例10で得られたポリオキシアルキレンポリオール(a2-3)620.8g、マロン酸ジエチル0.5g及びHDI72.0gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1’-4)を得た。ウレタンプレポリマー(P1’-4)の水酸基価は29mgKOH/g、粘度は、20,000mPa・s/25℃、Mwは19,000であった。
還流冷却管、攪拌棒及び温度計をセットした4つ口フラスコに製造例5で得られたポリオキシアルキレンポリオール(a1-5)433.3g、製造例7で得られたポリオキシアルキレンポリオール(a1-7)504.2g、マロン酸ジエチル0.5g及びHDI62.5gを投入し、120℃で8時間反応させて水酸基末端ウレタンプレポリマー(P1’-5)を得た。ウレタンプレポリマー(P1’-5)の水酸基価は24mgKOH/g、粘度は、16,000mPa・s/25℃、Mwは18,000であった。
主剤としてのプレポリマー(P1-1)~(P1-5)、(P1’-1)~(P1’-5)又はポリオール(a1-1)[製造例1で得られたポリオキシアルキレンポリオール(a1-1)]、硬化剤としてのプレポリマー(P2-1)~(P2-2)又はデュラネートTLA-100[HDIのイソシアヌレート体;旭化成(株)製、化学式量は540]、溶剤としての酢酸エチル及び硬化触媒(D-1)としてのK-KAT XK-635[楠本化成(株)製]を表2に記載の部数で混合し、38μm厚みのポリエチレンテレフタレートフィルムに固形分換算の膜厚が50μmとなるようにバーコーターを用いて塗布した。110℃で10分硬化させた後、25℃で3日間養生して粘着シートを得た。得られた粘着シートを用いて以下の評価方法で初期粘着力、膜強度及び湿熱試験後粘着力を評価した結果を、粘着剤の硬化膜のウレタン基濃度及び2液硬化時のNCO/OH比率と共に表3に示す。
実施例1~12及び比較例1~6で得られた粘着シートを200mm×25mmの大きさに裁断し、SUS板に貼り合わせ、引張試験機を用い、23℃で引っ張り速度1,000mm/分の条件で180°剥離強度(単位:N/25mm)を測定した。測定は5つの試料について行い、その平均値を表3に示した。サージカルテープ等に使用する場合は、剥離強度は10~15N/25mmの範囲が好ましく、表面保護シート等に使用する場合は、1~5N/25mmの範囲が好ましい。また、剥離状態についても下記の基準で併せて評価した。
<剥離状態の評価基準>
○:ポリエチレンテレフタレートフィルムと粘着剤との界面剥離ができている。
×:粘着剤の凝集破壊が生じる。
実施例1~12及び比較例1~6で得られた粘着シートの粘着面を指で強く10回こすり、粘着剤が剥がれるかを目視で確認した。評価基準は以下の通り。
◎:まったく傷がつかない。
○:傷はつくが、白く曇らない。
△:傷がつき、白く曇る。
×:凝集破壊し、剥がれる。
実施例1~12及び比較例1~6で得られた粘着シートを200mm×25mmの大きさに裁断し、SUS板に貼り合わせ、65℃95%RHに保った高温恒湿器内で72時間保管したのちに取り出し、23℃常湿で24時間静置した後に、引張試験機を用い、23℃で引っ張り速度1,000mm/分の条件で180°剥離強度(単位:N/25mm)を測定した。測定は5つの試料について行い、その平均値を表3に示した。
サージカルテープ及び表面保護シート等に使用する場合は、湿熱試験後粘着力と初期粘着力の差が小さい方が長期間貼り付けた後の剥がしやすさにおいて有利であり、差が5N/25mm以内であることが望ましい。
Claims (4)
- 主剤と硬化剤とを含有し、
前記主剤は、ポリオール成分(A)と有機ポリイソシアネート成分(B)とを反応させてなる水酸基を有するウレタンプレポリマー(P1)及び/又はポリオール成分(A)を含有し、
前記硬化剤は、ポリオール成分(A)と有機ポリイソシアネート成分(B)とを反応させてなるイソシアネート基を有するウレタンプレポリマー(P2)及び/又は有機ポリイソシアネート成分(B)を含有し、
下記(1)~(5)を満たす2液硬化性ウレタン粘着剤。
(1)水酸基を有するウレタンプレポリマー(P1)に用いられるポリオール成分(A)及び/又は主剤として用いられるポリオール成分(A)が、分子末端に一般式(1)で表される基及び/又は一般式(2)で表される基を有するポリオール(A1)を含有し、ポリオール(A1)が有する一般式(1)で表される基の合計個数の割合が、ポリオール(A1)が有する一般式(1)で表される基の個数及び一般式(2)で表される基の個数の合計を基準として40%以上である。
(2)2液硬化性ウレタン粘着剤に用いられる全てのポリオール成分(A)の総不飽和度の平均値が0.010meq/g以下である。
(3)ウレタンプレポリマー(P1)及びウレタンプレポリマー(P2)の重量平均分子量が、1,000~100,000である。
(4)ポリオール成分(A)及び有機ポリイソシアネート成分(B)の化学式量又は数平均分子量が、20,000以下である。
(5)主剤が含有する溶剤[但し、ポリオール成分(A)を除く]及び硬化剤が含有する溶剤[但し、有機ポリイソシアネート成分(B)を除く]の合計重量の割合が、主剤及び硬化剤の合計重量を基準として、5重量%以下である。 - 前記ウレタンプレポリマー(P1)に用いられるポリオール(A1)及び/又は前記主剤として用いられるポリオール(A1)が、一般式(3)で表される分子末端にヒドロキシプロピル基を有するポリオキシアルキレンポリオール(a1)及び/又はそのエチレンオキサイド付加物(a2)である請求項1記載の2液硬化性ウレタン粘着剤。
- 請求項1又は2記載の2液硬化性ウレタン粘着剤の硬化物。
- 請求項3記載の2液硬化性ウレタン粘着剤の硬化物を含有するウレタン粘着シート。
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EP4130189A4 (en) * | 2020-09-07 | 2023-11-01 | Lg Chem, Ltd. | POLYURETHANE-BASED ADHESIVE COMPOSITION, SURFACE PROTECTION FILM COMPRISING SAME, METHOD FOR MANUFACTURING SURFACE PROTECTION FILM, AND METHOD FOR MANUFACTURING ORGANIC ELECTROLUMINESCENT DEVICE |
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