WO2013031798A1 - 耐熱衝撃性硬化物及びその製造方法 - Google Patents
耐熱衝撃性硬化物及びその製造方法 Download PDFInfo
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- WO2013031798A1 WO2013031798A1 PCT/JP2012/071773 JP2012071773W WO2013031798A1 WO 2013031798 A1 WO2013031798 A1 WO 2013031798A1 JP 2012071773 W JP2012071773 W JP 2012071773W WO 2013031798 A1 WO2013031798 A1 WO 2013031798A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/08—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
Definitions
- the present invention relates to a thermal shock resistant cured product that is excellent in thermal shock resistance and can be used for an adhesive part, a sealing part, a protective film, and the like for electronic components in a semiconductor device, a printed wiring board, and the like, and a manufacturing method thereof.
- Electronic devices such as semiconductor devices and printed wiring boards include various electronic components on a substrate containing, for example, resin, glass, metal, and the like.
- solder an adhesive, or the like is used depending on the purpose or application.
- the solder used for connecting electronic components to a substrate is being switched from conventional tin-lead solder to lead-free solder.
- the melting point of lead-free solder is 220 ° C, which is higher than that of conventional tin-lead solder.
- the reflow processing temperature of electronic circuit boards using lead-free solder has been increased from 230 ° C to 260 ° C. It has been. Materials used for electronic circuit boards are required to withstand this thermal shock at 260 ° C.
- Patent Document 1 discloses a thermosetting silicone polymer-containing resin obtained by reacting a silane compound represented by the general formula R ′ m (H) k SiX 4- (m + k) with a hydrosilylation reagent. A substrate comprising the same is disclosed.
- a reaction such as chloroplatinic acid or a catalyst such as chloroplatinic acid is required.
- the reaction at high temperature has an adverse effect on the semiconductor chip.
- Patent Document 2 describes a polysiloxane compound obtained by a production method in which at least two types of alkoxysilanes are subjected to hydrolysis copolycondensation under alkaline conditions.
- the thermal shock resistance as a cured product has never been studied.
- the polysiloxane compound obtained by the manufacturing method which carries out hydrolysis copolycondensation on acidic conditions was not employ
- An object of the present invention is to provide a cured product that is excellent in thermal shock resistance and hardly peels off from a bonded state in a base material made of metal, glass, resin or the like, and a method for producing the same.
- the present inventors represent a monomer represented by the following general formula (1), a monomer represented by the following general formula (2), a monomer represented by the following general formula (3), and the following general formula (4). And a monomer represented by the following general formula (5) are cured by copolycondensation in the presence of an acid catalyst in the proportions of a mole, w mole, x mole, y mole and c mole, respectively.
- (X) is a siloxane bond-forming group
- R 1 , R 2 and R 4 are a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, and a cycloaralkyl group, respectively.
- R 1 , R 2 and R 4 is a group having an ethylenically unsaturated bond.
- part or all of (X) may be the same or different.
- R 4 in the general formula (5) may be the same or may be different.
- one part or all part of R ⁇ 5 > of General formula (4) and (5) may be the same, and may differ.
- the cured product of the present invention is excellent in thermal shock resistance because it is difficult for cracks to occur even when subjected to repeated thermal shocks. Moreover, since the cured product bonded to the base material is unlikely to peel off from the base material, it is useful as a protective film that shields the base material from water and air. In addition, if it is present between one member and another member or in the gap between the base material and the base material, it is difficult to peel off from the joint even if subjected to repeated thermal shocks. It is also useful as an interlayer bonding material.
- the monomers represented by the general formulas (1) to (5) are copolycondensed using an acidic catalyst, the monomers are generally quantitatively incorporated into the copolycondensate according to the number of charged monomers, and are cured. A precursor is obtained. Therefore, the charged amount of each monomer represented by the general formulas (1) to (5) is determined with respect to the composition of the desired cured product precursor. In addition, since the composition of the cured product precursor actually obtained can be determined by analytical techniques such as NMR, if you want to further improve the performance of the cured product, fine-tune the preparation composition based on the analysis results. To obtain a cured product precursor having desired performance.
- (meth) acryl means acryl and methacryl
- (meth) acrylate means acrylate and methacrylate
- the “(meth) acryloyl group” means an acryloyl group and a methacryloyl group.
- the method for producing the thermal shock-resistant cured product of the present invention includes a monomer represented by the general formula (1), a monomer represented by the general formula (2), a monomer represented by the general formula (3), In the presence of an acid catalyst, the monomer represented by the general formula (4) and the monomer represented by the general formula (5) are respectively mixed at a ratio of a mole, w mole, x mole, y mole, and c mole. , A condensation step of obtaining a cured product precursor by copolycondensation, and a curing step of polymerizing at least a part of the ethylenically unsaturated bonds of the cured product precursor to cure the cured product precursor.
- the monomers represented by the general formulas (1) to (5) may be used alone or in combination of two or more.
- (X) means a siloxane bond forming group capable of generating a siloxane bond by condensation.
- a monomer having four siloxane bond-forming groups in one molecule is also called “Q monomer”.
- a monomer having three siloxane bond-forming groups in one molecule is also called “T monomer”, and a monomer having two siloxane bond-forming groups in one molecule is “D monomer”, and one siloxane bond is formed in one molecule.
- Monomers having groups are also referred to as “M monomers”.
- the monomer of the general formula (1) is “Q monomer”
- the monomer of the general formula (2) is “T monomer”
- the monomer of the general formula (3) is “D monomer”.
- the monomer of the general formula (4) is “M monomer”.
- the monomer of the general formula (5) is a monomer that forms twice the amount of a structural unit similar to the structural unit generated from the M monomer at the time of co-condensation. It is referred to as “M2 monomer”.
- a condensate having a structural unit having four siloxane bonds is formed, and the structural unit incorporated in the condensate is called a “Q unit”.
- the T monomer produces a T unit having three siloxane bonds
- the D monomer produces a D unit having two siloxane bonds
- the M monomer produces an M unit having one siloxane bond. Since the M unit has an effect of terminating the condensed chain due to the siloxane bond to protect the end of the condensed chain, the M monomer is sometimes referred to as a “capping agent”.
- examples of the siloxane bond-forming group (X) include a hydroxyl group or a hydrolyzable group
- examples of the hydrolyzable group include a halogeno group and an alkoxy group.
- an alkoxy group is preferable because it has good hydrolyzability and does not by-produce an acid, and an alkoxy group having 1 to 3 carbon atoms is more preferable.
- Examples of the monomer represented by the general formula (1) include tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane, and tetra n-butoxysilane. Of these, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane and the like are preferable because they are easily available and have good hydrolyzability.
- At least one of R 1 , R 2 and R 4 in the general formulas (2) to (5) is a group having an ethylenically unsaturated bond.
- R 1 in the general formula (2) is preferably a group having an ethylenically unsaturated bond. This is because it is easy to obtain a T monomer containing a group having an ethylenically unsaturated bond.
- the group having an ethylenically unsaturated bond is preferably a group having an acryloyl group or a methacryloyl group, and more preferably an organic group represented by the following general formula (6).
- R 6 is a hydrogen atom or a methyl group
- R 6 may be the same or different
- R 7 is an alkylene group having 1 to 6 carbon atoms
- R 7 is the same. Or different.
- R 7 is preferably a propylene group. This is because it is easy to obtain or synthesize a compound that forms an organic functional group containing a propylene group.
- R 6 is preferably a methyl group or a hydrogen atom, more preferably a hydrogen atom.
- a monomer in which at least one of R 1 , R 2 and R 4 is a group having an ethylenically unsaturated bond is used, and at least a part of the ethylenically unsaturated bond is a carbon-carbon double bond.
- a cured product obtained by polymerizing between them to form a polymer chain with a carbon-carbon bond is preferable.
- the polymer chain of the carbon-carbon bond can be represented by the following general formula (7).
- n representing the degree of polymerization of unsaturated bonds is preferably 1 or more and 100 or less, more preferably 2 or more and 50 or less.
- the cured product precursor obtained by the condensation step according to the present invention includes a structural unit derived from the monomer represented by the general formulas (1) to (5), that is, a siloxane structure.
- the cured product precursor since the monomer represented by the general formula (2) is always used, the cured product precursor includes a silsesquioxane structure containing —Si—O—.
- -A cured product having a carbon polymer chain structure is obtained.
- the silsesquioxane structure containing —Si—O— has a large number of linear structures.
- the Q monomer represented by the general formula (1) generates a Q unit by condensation.
- the heat resistance tends to be improved.
- the preferable blending amount a when using the Q monomer is a / (a + w + x + y + 2c) in molar ratio with respect to the sum of blending amounts of monomers represented by formulas (1) to (5) (a + w + x + y + 2c)
- the range is from 0 to 1, more preferably from 0 to 0.4.
- T monomer represented by the general formula (2) is an essential raw material.
- the blending amount w of the T monomer is preferably 0 ⁇ w / (in the relationship of the blending amount a of the Q monomer, the blending amount x of the D monomer, the blending amount y of the M monomer, and the blending amount c of the M2 monomer.
- a + x + y + 2c) ⁇ 10 more preferably 0.01 ⁇ w / (a + x + y + 2c) ⁇ 5, more preferably 0.1 ⁇ w / (a + x + y + 2c) ⁇ 2, particularly preferably 0.4 ⁇ w / (a + x + y + 2c).
- R 1 in the general formula (2) is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group, and a group having an ethylenically unsaturated bond. Of these, a group having an ethylenically unsaturated bond is preferable.
- T monomer represented by the general formula (2) examples include triethoxysilane, tripropoxysilane, methyltrimethoxysilane, methyltriethoxysilane, benzyltrimethoxysilane, cyclohexyltrimethoxysilane, phenyltrimethoxysilane, Phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, (p-styryl) trimethoxysilane, (p-styryl) triethoxysilane, (3-methacryloyloxypropyl) trimethoxysilane, (3-methacryloyloxypropyl) ) Triethoxysilane, (3-acryloyloxypropyl) trimethoxysilane, (3-acryloyloxypropyl) triethoxysilane, and the like.
- (3-methacryloyloxypropyl) trimethoxysilane, (3-methacryloyloxypropyl) triethoxysilane, (3-acryloyloxypropyl) trimethoxysilane, (3-acryloyloxy) Propyl) triethoxysilane and the like are preferable.
- the D monomer represented by the general formula (3) is an essential raw material.
- R 2 in the general formula (3) is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group, and a group having an ethylenically unsaturated bond.
- R 3 is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, and an aryl group.
- preferred D monomers is a compound wherein R 2 and R 3 are selected from methyl and phenyl, more preferably a compound wherein R 2 and R 3 are both methyl groups.
- Examples of the D monomer represented by the general formula (3) include dimethoxydimethylsilane, dimethoxydiethylsilane, diethoxydimethylsilane, diethoxydiethylsilane, dimethoxymethylphenylsilane, diethoxymethylphenylsilane, and dimethoxybenzyl.
- Examples include methylsilane, dimethoxy (3-methacryloyloxypropyl) methylsilane, diethoxy (3-methacryloyloxypropyl) methylsilane, dimethoxy (3-acryloyloxypropyl) methylsilane, diethoxy (3-acryloyloxypropyl) methylsilane, and the like.
- dimethoxydimethylsilane, diethoxydimethylsilane, dimethoxymethylphenylsilane and the like are preferable because they are easily available.
- R 4 in the general formula (4) is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group, and a group having an ethylenically unsaturated bond.
- R 5 is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, and an aryl group.
- M monomer is a compound wherein R 4 or R 5 is selected from methyl and phenyl, more preferably a compound wherein R 4 or R 5 are both methyl groups.
- This M monomer has one siloxane bond-forming group and functions to block the end of the polysiloxane condensation chain. Therefore, in the production of the cured product of the present invention, the polysiloxane which is a cured product precursor is used. Can be used to control the molecular weight.
- Examples of the M monomer represented by the general formula (4) include methoxytrimethylsilane, methoxytriethylsilane, ethoxytrimethylsilane, ethoxytriethylsilane, methoxydimethylphenylsilane, ethoxydimethylphenylsilane, trimethylchlorosilane, triethylchlorosilane, and trimethylbromo. Examples thereof include silane and triethylbromosilane.
- M monomer represented by the general formula (4) and the M2 monomer represented by the general formula (5) described later can be divided and used. A portion can be used at the beginning of the condensation step and the remainder can be used in an end cap step (described below) between the condensation step and the curing step. Moreover, you may use M monomer and M2 monomer only at an end cap process, without using it at a condensation process.
- the reactivity in an end cap process can be improved as M monomer represented by General formula (4) is a compound containing a halogeno group as a siloxane bond production
- R 4 in the general formula (5) is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group, and a group having an ethylenically unsaturated bond.
- R 5 is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, and an aryl group.
- the M2 monomer represented by the general formula (5) can give two M units from one molecule upon cocondensation.
- Examples of the M2 monomer represented by the general formula (5) include 1,1,3,3-tetramethyldisiloxane, 1,1,3,3-tetraethyldisiloxane, hexamethyldisiloxane, hexaethyldisiloxane, Examples include hexapropyldisiloxane. Of these, hexamethyldisiloxane is preferred because it is easily available.
- condensation step a specific amount of the monomers represented by the above general formulas (1) to (5) is used, and a copolycondensation reaction is caused in the presence of an acid catalyst to produce a cured product precursor.
- the acid catalyst used in the condensation step is not particularly limited, but is preferably an acid having a pKa (acid dissociation constant) in water of 4.0 or less.
- inorganic strong acids such as hydrochloric acid, sulfuric acid and nitric acid are preferable, and hydrochloric acid, nitric acid and sulfuric acid are more preferable.
- hydrochloric acid is particularly preferable because it can volatilize and remove the acid content, so that the neutralization step is not essential and there is no inconvenience such as side reaction due to oxidizing power.
- the amount of the acid catalyst to be used is usually 0.01 to 20 mol, preferably 0.1 to 10 mol, relative to a total of 100 mol of the monomers represented by the general formulas (1) to (5). More preferably, it is 1 to 5 mol.
- the copolycondensation reaction in the condensation step is preferably carried out in the presence of both the acid catalyst and water.
- a part or all of the siloxane bond-forming groups of the monomers represented by the general formulas (1) to (5) are hydrolyzable groups
- at least the total amount of equivalents of the hydrolyzable groups is not less than It is preferable to use water.
- the upper limit of the preferable amount of water in the reaction system is 100 times the total amount of equivalents of the hydrolyzable groups.
- a preferred embodiment in the case of performing the reaction using both the acid catalyst and water includes a method using an appropriate amount of 0.1 to 10% by mass hydrochloric acid aqueous solution.
- the reaction temperature in the condensation step is a simple method of keeping the set temperature constant, but a method of gradually raising the temperature is also preferable. If the reaction temperature is too high, it becomes difficult to control the reaction, which is expensive in terms of energy. Further, when the raw material contains an ethylenically unsaturated bond, there is a risk of decomposition. On the other hand, if the reaction temperature is too low, the reaction takes time and hydrolysis polycondensation becomes insufficient. Therefore, a preferable upper limit is 100 ° C, more preferably 80 ° C, and more preferably 60 ° C. A preferable lower limit is 0 ° C, more preferably 15 ° C, and more preferably 25 ° C.
- a monomer that forms the cured product precursor, an acid catalyst, and a reaction solvent that dissolves water and other components used for hydrolysis can be used.
- a reaction solvent alkyl alcohol, propylene glycol monoalkyl ether, or a compound having one alcoholic hydroxyl group in the molecule is preferable.
- reaction solvents are selected from methanol, ethanol, 1-propanol, 2-propanol and t-butyl alcohol.
- the D monomer represented by the general formula (3) has two siloxane bond-forming groups, a linear condensation molecule is generated in the condensation reaction.
- the D monomer represented by the general formula (2) having three siloxane bond-forming groups is used.
- a monomer represented by the general formula (1) having four siloxane bond-forming groups produces a cured product precursor having a three-dimensional crosslinked structure.
- a ladder-like or cage-like structure is formed.
- a structure in which a part of the siloxane bond generating group (X) remains may be formed due to steric hindrance or the like.
- the siloxane bond-forming group (X) remaining without being condensed is hydrolyzed and converted into a form of OH (silanol) bonded to Si atoms. Is obtained.
- a group that remains without being condensed and then changed to an OH group is referred to as a “Si—OH group”.
- the Si—OH group can be measured. It remains even when an end cap step is performed in which at least one of the highly reactive M monomer and M2 monomer is further reacted with the condensate having a Si—OH group obtained using a predetermined amount of the monomer.
- the amount of Si—OH groups can also be determined.
- the monomers represented by the general formulas (1) and (2) have a siloxane bond-forming group, if all siloxane bond-forming groups generate siloxane bonds by condensation, the cross-linked structure of the condensate is too strong and free. It becomes a heat-resistant cured product that is fragile and is fragile in an impact resistance test.
- some of the siloxane bond-forming groups of the monomers represented by the general formulas (1) and (2) are not condensed, and many linear structures are present. Since the condensate contained easily deforms the molecule, it becomes a cured product that is not easily broken in the impact resistance test.
- the end cap step can proceed in the same reaction system as the condensation step.
- M monomer and M2 monomer are not used in the condensation step, they can be used only in the end cap step. Since the condensate obtained by the condensation step usually contains —Si—OH groups, when the proportion of this —Si—OH group is high, the —Si—OH group is reacted with the remaining M monomer.
- the monomers represented by the general formulas (1) to (5) are condensed in the presence of an acid catalyst, the monomers represented by the general formulas (1) and (2) are also easily condensed linearly.
- a cured product that is hard to break in the impact resistance test can be obtained.
- the condensation step or end cap step when a condensate having such a linear structure is obtained, the condensate having the remaining siloxane bond-forming group (X) remains as Si—OH. Can be confirmed. That is, in the production method of the present invention, preferably, when the cured product precursor contains Si—OH groups, and the amount of Si—OH groups is z mol, the value of z is different from the blending amount of each monomer.
- the following processes can be included after a condensation process. These steps can be carried out singly or in combination.
- an organic solvent such as a reaction solvent does not cause phase separation with water, it can further be separated from water with a solvent substitution step. It can also be replaced with an organic solvent.
- the volatile catalyst is volatilized and removed to eliminate the neutralization and water washing steps, and more preferably the catalyst is volatilized and removed in the concentration step.
- Neutralization process The process of neutralizing the reaction liquid obtained at the condensation process with an alkali.
- (Washing step) A step of washing the condensate contained in the neutralized solution with water.
- (Concentration step) A step of concentrating the aqueous liquid containing the condensate. Includes desolation.
- (Solvent replacement step) A step of re-dissolving the concentrated or de-soluble concentrate with another organic solvent.
- (End cap step) A step of reacting an M monomer with a remaining compound having a Si—OH group.
- a cured product precursor or a cured product precursor solution thereof can be obtained by a condensation process or a process including the post-process.
- various analyzes such as molecular weight can be performed on the polymer or polymer solution.
- the residual ratio of siloxane bond-forming groups can be calculated from the integrated intensity ratio of each peak in the 1 H-NMR (nuclear magnetic resonance spectrum) chart. It is preferable that substantially all of the hydrolyzable groups are hydrolyzed. For example, almost no peaks based on the hydrolyzable groups are observed in the 1 H-NMR chart of the obtained cured product precursor. It can be confirmed by not being done.
- the number average molecular weight of the cured product precursor can be measured by gel permeation chromatography (GPC) analysis, and is preferably 500 to 100,000, more preferably 800 to 50,000, in terms of standard polystyrene. More preferably, it is 1000 to 20,000.
- GPC gel permeation chromatography
- cured material precursor obtained by the process including a condensation process or the said post process may be melt
- the organic solvent is not particularly limited, but it is economical and preferable to use the same organic solvent as the reaction solvent. In order to improve the leveling property at the time of coating, it is also preferable to use another organic solvent in combination.
- the cured product precursor solution may contain other components as long as the storage stability is not impaired. Other components include polymerizable unsaturated compounds, radical polymerization inhibitors, antioxidants, ultraviolet absorbers, light stabilizers, leveling agents, organic polymers, fillers, metal particles, pigments, polymerization initiators, sensitizers, etc. Is mentioned.
- a coating film is usually formed at a predetermined site using a curable composition containing a cured product precursor, a polymerization initiator and an organic solvent, and then this coating film is subjected to heat treatment or light irradiation.
- the cured product precursor can be cured into a cured product by the above method.
- a method such as heating, active energy ray irradiation, or a combination thereof can be used.
- the cured product precursor can be crosslinked to obtain a cured product. Since the cured product cured by the curing step includes a crosslinked structure by polymerization of ethylenically unsaturated bonds, the cured product is more flexible and excellent in adhesiveness than a conventional cured product cured only by a condensation reaction.
- the crosslinked structure by condensation reaction is also included, the crosslinked structure rich in heat resistance than the conventional hardened
- the polymerizable unsaturated compound is preferably a compound having an ethylenically unsaturated bond, more preferably a (meth) acrylate compound having a (meth) acryloyl group, more preferably a monofunctional (meth) acrylate, Functional (meth) acrylate, urethane (meth) acrylate, etc. are mentioned. These may be used alone or in combination of two or more. Moreover, when using a polyfunctional (meth) acrylate compound, a crosslinked structure can also be produced in the obtained thermal shock-resistant cured product.
- radical polymerization inhibitor for stabilizing the ethylenically unsaturated bond examples include phenolic compounds such as hydroquinone and hydroquinone monomethyl ether, and N-nitrosophenylhydroxylamine salts.
- antioxidant examples include hinders such as 2,6-di-tert-butyl-4-methylphenol and pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate).
- examples thereof include dophenol-based antioxidants, sulfur-based secondary antioxidants such as 4,6-bis (octylthiomethyl) -o-cresol, and phosphorus-based secondary antioxidants. These may be used alone or in combination of two or more.
- a radical polymerization inhibitor and an antioxidant are used, the storage stability and thermal stability of the curable composition and the thermal shock-resistant cured product are used. Etc. can be improved.
- the content of the radical polymerization inhibitor is preferably 1 to 10,000 masses with respect to 1,000,000 mass parts of the cured product precursor. Parts, more preferably 10 to 2,000 parts by mass, still more preferably 100 to 500 parts by mass.
- the content of the antioxidant is preferably 1 to 10,000 parts by weight with respect to 1,000,000 parts by weight of the cured product precursor, More preferred is 10 to 2,000 parts by mass, and still more preferred is 100 to 500 parts by mass.
- UV absorber examples include 2- [4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1, Hydroxyphenyl triazine UV absorbers such as 3,5-triazine and benzotriazoles such as 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol
- UV absorbents examples include ultraviolet absorbents, inorganic fine particles that absorb ultraviolet rays such as titanium oxide fine particles and zinc oxide fine particles. These may be used alone or in combination of two or more.
- the light stabilizer examples include hindered amine light stabilizers such as bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate. UV absorbers and light stabilizers can enhance UV resistance and weather resistance.
- leveling agent examples include silicone polymers and fluorine atom-containing polymers.
- a leveling agent can improve the leveling property at the time of apply
- organic polymer examples include (meth) acrylic polymers, and preferable constituent monomers include methyl methacrylate, cyclohexyl (meth) acrylate, N- (2- (meth) acryloxyethyl) tetrahydrophthalimide, and the like.
- the filler among the other components include silica and alumina.
- the concentration of the cured product precursor is not particularly limited, but is preferably between 0.1 and 70% by mass in the entire curable composition, and more preferably 0.8%. It is between 5 and 50% by mass, more preferably 1 to 30%.
- At least a part of the ethylenically unsaturated bond of the cured product precursor can be polymerized by using a polymerization method of irradiation of active energy rays or heating or both in the curing step, depending on the purpose.
- a polymerization initiator can be selected and blended.
- Preferred as the photopolymerization initiator are 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propane- 1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-1- [4- (methylthio) phenyl]- 2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, diethoxyacetophenone, oligo [2-hydroxy-2-methyl-1 -[4- (1-methylvinyl) phenyl] propanone] and 2-hydroxy-1- ⁇ 4- [4- (2-hydroxy-2-methyl-propionyl) Acetophenone compounds such as -benzyl] -phenyl ⁇ -2-methyl-propan-1-one, 2,2-dime
- thermal polymerization initiator Preferred as the thermal polymerization initiator are dicumyl peroxide, benzoyl peroxide, tertiary butyl peroxy 2-ethylhexanoate, 1,1,3,3-tetramethylbutyl peroxy 2-ethylhexanoate, 1-cyclohexyl- Peroxides such as 1-methylethylperoxy 2-ethylhexanoate, tertiary butyl peroxybenzoate, lauroyl peroxide, cumene hydroperoxide, 2,2'-azobisisobutyronitrile (AIBN), 1,1'- Azobis (cyclohexane-1-carbonitrile), 2,2′-azobis [2-methyl-N- (2-hydroxyethyl) -propionamide], 2,2′-azobis [2- (2-imidazoline-2- Yl) propane] and the like.
- AIBN 2,2'-azobisisobutyronitrile
- AIBN 1,1
- a preferable blending amount of the polymerization initiator is 0.1 to 10 parts by weight, more preferably 0.3 to 5 parts by weight, and further preferably 0.5 to 3 parts by weight with respect to 100 parts by weight of the cured product precursor. It is.
- a preferable curing method is photocuring, more preferably active energy ray curing.
- the coating film or the like contains an organic solvent, it is preferable to cure after removing most of the solvent by a method such as heat drying.
- the active energy ray include an electron beam, ultraviolet rays, and visible light, and ultraviolet rays are particularly preferable.
- the ultraviolet irradiation device include a high-pressure mercury lamp, a metal halide lamp, a UV electrodeless lamp, and an LED. The irradiation energy should be appropriately set according to the type and composition of the active energy ray.
- the irradiation energy in the UV-A region is 100 to 5,000 mJ / cm 2, more preferably from 500 ⁇ 3,000 mJ / cm 2, more preferably from 1000 ⁇ 3000 mJ / cm 2.
- the curing temperature when thermosetting is employed in the curing step is appropriately selected according to the decomposition temperature for obtaining the half-life of the thermal polymerization initiator used, but is preferably 30 to 200 ° C., more preferably Is 40 to 150 ° C, more preferably 50 to 120 ° C.
- the cured product precursor obtained by the production method of the present invention can be specifically represented by the following general formula (8).
- R 1 , R 2 and R 4 are each selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group and a group having an ethylenically unsaturated bond.
- R 3 and R 5 are groups selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group and an aryl group, and R 1 , R 2 and At least one of R 4 is a group having an ethylenically unsaturated bond.
- R 8 is a group selected from a hydrogen atom, an alkyl group, an aralkyl group, a cycloalkyl group, a cycloaralkyl group, an aryl group and a group having an ethylenically unsaturated bond.
- R 1 to R 5 and R 8 are the same or different.
- R 8 is the same as any one of R 1 to R 7 described above, and is preferably a hydrogen atom.
- w and x are positive numbers
- a and s are 0 or a positive number, and preferably 0 ⁇ w / (a + x + s) ⁇ 10.
- the preferred range for b is the same as the preferred range for z.
- the value of b is preferably 0.05 ⁇ b / (a + w + x + s) ⁇ 1.0, more preferably 0.1 ⁇ b / (a + w + x + s) in relation to the content of each structural unit. ⁇ 0.6.
- % is based on mass unless otherwise specified.
- AC- represents an acryloyloxypropyl group
- MAC- represents a methacryloyloxypropyl group.
- the 1 H-NMR analysis of the polysiloxane constituting the cured product precursor synthesized in the examples and comparative examples is about 1 g of measurement sample and about hexamethyldisiloxane (hereinafter referred to as “HMDSO”) which is an internal standard substance.
- Thermal shock resistance evaluation The thermal shock resistance was evaluated as follows. A mold of 10 mm ⁇ 10 mm was produced with a 0.2 mm thick PTFE (polytetrafluoroethylene) sheet, and the mold was placed in close contact with the slide glass. The curable composition was put in this frame, and the coating film surface was smoothed with a spatula. This is irradiated with ultraviolet light with an electrodeless lamp bulb (H bulb), lamp height of 10 cm, and integrated light quantity of 3 J to form a cured product with a thickness of about 130 ⁇ m, the PTFE sheet mold is removed, and the coating film is cured. It was.
- H bulb electrodeless lamp bulb
- the form of the PTFE sheet was removed to obtain a cured product for a thermal shock resistance test having a film thickness of about 130 ⁇ m.
- the cured product was placed in a thermostat and heated at 250 ° C. or higher for 2 minutes, and subsequently heated at 260 ° C. for 30 seconds. Then, it stood to cool at room temperature, and the presence or absence of the peeling from the slide glass of a hardened
- thermal shock resistance three samples were evaluated for each of the examples and comparative examples, and a test of a maximum of 10 cycles was performed until cracking or peeling occurred midway. The results are shown in Table 3.
- Pencil hardness test The pencil hardness test was implemented as follows. A curable composition was applied onto a slide glass using a bar coater, and then irradiated with ultraviolet rays with an electrodeless lamp bulb (H bulb), a lamp height of 10 cm, and an integrated light amount of 3 J, to produce a cured product having a thickness of 10 ⁇ m. The cured product was cured by a hand-drawn method using a Mitsubishi pencil in accordance with JIS K-5600-5-4 “Paint General Test Method: Scratch Hardness (Pencil Method)”. The results are shown in Table 4. The pencil hardness of each cured product in Table 4 describes the hardness of the pencil obtained by the test.
- Example 1 1-1 Synthesis of Cured Product Precursor
- a 500 mL four-necked flask equipped with a three-one motor stirrer, a dropping funnel, a reflux condenser and a thermometer was charged with 113.46 g (484 mmol) of 3-acryloyloxypropyltrimethoxysilane and dimethoxydimethyl.
- Silane 32.43 g (270 mmol) and 2-propanol 45.19 g were charged.
- the temperature was raised using a hot water bath, and when the reaction system internal temperature exceeded 40 ° C., 36.19 g of 0.8% hydrochloric acid aqueous solution was dropped from the dropping funnel while stirring the reaction system.
- the reaction system After completion of dropping at about 50 ° C., the reaction system was allowed to stand at room temperature (about 25 ° C., hereinafter the same) for 15 hours. After 0.02 g of p-methoxyphenol was added and dissolved therein, the solvent was distilled off under reduced pressure while blowing air to obtain 101.68 g of a colorless transparent liquid cured product precursor C1.
- the viscosity of the obtained cured product precursor C1 was 1970 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1300.
- the composition ratio of the T unit (AC-SiO 3/2 ) having an acryloyl group and the D unit (Me 2 -SiO 2/2 ) having a dimethyl group is the raw material forming these units. (See Table 2).
- the amount of residual isopropoxy group was 0.03 mol with respect to 1 mol of AC—SiO 3/2 .
- This pyridine solution was dropped from the dropping funnel into the above-mentioned pyridine solution of trimethylchlorosilane at room temperature, and then heated and stirred at 75 ° C. for 3 hours.
- the solvent was distilled off under reduced pressure and concentrated. After 50.00 g of diisopropyl ether was added to the residue and dissolved, 20.00 g of water was added and the mixture was washed with a separatory funnel. The same water washing operation was repeated a total of 7 times.
- 0.002 g of a polymerization inhibitor was added to the organic layer and dissolved, and the solvent was distilled off under reduced pressure to obtain a trimethylsilylated product of a colorless transparent liquid cured product precursor (C1). Since the trimethylsilyl group concentration increased by the reaction is obtained by NMR measurement of the trimethylsilylated product of the cured product precursor (C1), the Si—OH group concentration of the cured product precursor (C1) is 3-acryloyloxypropyl in molar ratio. It was determined to be 0.47 mole per mole of trimethoxysilane monomer and is shown in Table 2.
- Example 2 The amounts of 3-acryloyloxypropyltrimethoxysilane, dimethoxydimethylsilane, 2-propanol, and 0.8% aqueous hydrochloric acid used were 70.91 g (303 mmol), 81.07 g (674 mmol), 45.22 g, and 40%, respectively.
- a cured product precursor C2 was obtained in the same manner as in Example 1 except that the amount was .99 g.
- the yield of the cured product precursor C2 was 95.44 g, the viscosity was 207 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1300.
- the concentration of Si—OH groups was determined in the same manner as in Example 1, and the results are shown in Table 2. And the hardened
- Example 3 is a manufacturing example including a post-process.
- Example 1-2, 1-2 By the same method as the measurement of the Si—OH group concentration, the remaining Si—OH group of the cured product precursor C1 was trimethylsilylated to obtain a cured product precursor C3.
- 30 mL of pyridine was charged into a 200 mL four-necked flask equipped with a three-one motor stirrer, a dropping funnel, a reflux condenser, and a thermometer. 19 mL (150 mmol) of trimethylchlorosilane was added dropwise to the pyridine from the dropping funnel at room temperature to obtain a pyridine solution of trimethylchlorosilane.
- the residue was dissolved by adding 50 g of diisopropyl ether, and then 20.00 g of water was added, followed by washing with a separatory funnel. The same water washing operation was repeated a total of 7 times.
- 0.002 g of a polymerization inhibitor was added to the organic layer and dissolved, and the solvent was distilled off under reduced pressure to obtain a cured product precursor C3 that was a trimethylsilylated product of the cured product precursor (C1) as a colorless transparent liquid.
- the yield of the cured product precursor C3 was 9.34 g, the viscosity was 336 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1400.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- the evaluation results are shown in Tables 3 and 4. Since the cured product precursor C3 in Example 3 was obtained by reacting M monomer with the Si—OH group of the cured product precursor C1, the amount of M units in Table 2 is shown in parentheses. It was. 19 ml of trimethylchlorosilane with respect to 20.0 g of the cured product precursor C1 is 761 mmol in terms of the total amount of the cured product precursor C1, and is significantly excessive with respect to Si—OH remaining in the cured product precursor C1. However, only an equivalent amount of Si—OH contained in the cured product precursor C1 remains as an M unit in the cured product precursor C3. In the cured product precursor C3 after the reaction, Si— OH becomes 0.
- Example 4 113.46 g (484 mmol) of 3-acryloyloxypropyltrimethoxysilane, 32.43 g (270 mmol) of dimethoxydimethylsilane, 45.19 g of 2-propanol, 36.19 g of 0.8% aqueous hydrochloric acid, and 0.02 g of p-methoxyphenol
- 3-acryloyloxypropyltrimethoxysilane 56.73 g (242 mmol), dimethoxydimethylsilane 16.21 g (135 mmol), hexamethyldisiloxane 9.43 g (58 mmol), 2-propanol 33.55 g
- a cured product precursor C4 was obtained in the same manner as in Example 1 except that 19.15 g of an aqueous hydrochloric acid solution and 0.01 g of p-methoxyphenol were used and the reaction temperature was room temperature.
- the yield of the cured product precursor C4 was 57.90 g, the viscosity was 207 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1000.
- the concentration of Si—OH groups was determined in the same manner as in Example 1, and is shown in Table 2.
- One molecule of hexamethyldisiloxane gives two M units during copolycondensation.
- cured material was produced like Example 1 and evaluated about thermal shock resistance, pencil hardness, and external appearance evaluation.
- Example 5 113.46 g (484 mmol) of 3-acryloyloxypropyltrimethoxysilane, 32.43 g (270 mmol) of dimethoxydimethylsilane, 45.19 g of 2-propanol, 36.19 g of 0.8% aqueous hydrochloric acid, and 0.02 g of p-methoxyphenol
- 3-methacryloyloxypropyltrimethoxysilane 62.09 g (250 mmol), dimethoxydimethylsilane 60.11 g (500 mmol), tetramethoxysilane 38.06 g (250 mmol), 2-propanol 60.10 g, 0.8%
- a cured product precursor C5 was obtained in the same manner as in Example 1 except that 49.95 g of hydrochloric acid aqueous solution and 0.02 g of p-methoxyphenol were used.
- the yield of the cured product precursor C5 is 97.60 g, the viscosity is 28900 mPa ⁇ s (25 ° C.), and the number average molecular weight is 2500.
- the concentration of Si—OH groups was determined in the same manner as in Example 1 and listed in Table 2.
- the amount of T unit in Table 1 is shown in parentheses because other examples used 3-acryloyloxypropyltrimethoxysilane as the T monomer, while in Example 5, 3- This is to show that methacryloyloxypropyltrimethoxysilane was used.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- Example 6 113.46 g (484 mmol) of 3-acryloyloxypropyltrimethoxysilane, 32.43 g (270 mmol) of dimethoxydimethylsilane, 45.19 g of 2-propanol, 36.19 g of 0.8% aqueous hydrochloric acid, and 0.02 g of p-methoxyphenol
- 3-acryloyloxypropyltrimethoxysilane 141.82 g (605 mol), dimethoxydimethylsilane 162.13 g (1349 mmol), tetramethyldisiloxane 8.13 g (60.5 mmol), 2-propanol 88.86 g, 0
- a cured product precursor C6 was obtained in the same manner as in Example 1 except that 83.08 g of 8% hydrochloric acid aqueous solution and 0.04 g of p-methoxyphenol were used and the reaction temperature was room temperature.
- the yield of the cured product precursor C6 was 198.6 g, the viscosity was 115 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1360.
- the concentrations of Si—OH groups were determined in the same manner as in Example 1, and are shown in Table 2.
- One molecule of tetramethyldisiloxane gives two M units during copolycondensation, but in Example 6, tetramethyldisiloxane, which is different from the hexamethyldisiloxane shown in the monomer structure column of Table 1, Since siloxane is used, the M unit to be produced is H (Me) 2 —Si—O—, which is different in that it has a Si—H bond. Therefore, the amount of M unit in Table 2 is shown in parentheses.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- the yield of the cured product precursor C7 was 50.56 g, the viscosity was 5570 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1500.
- the concentrations of Si—OH groups were determined in the same manner as in Example 1, and are shown in Table 2.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- a cured product precursor C8 was obtained.
- the yield of the cured product precursor C8 was 101.40 g, the viscosity was more than 20000 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1400.
- the concentrations of Si—OH groups were determined in the same manner as in Example 1, and are shown in Table 2.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- a cured product precursor C9 was obtained in the same manner as in Example 1 except that 18.02 of an 8% hydrochloric acid aqueous solution and 0.01 g of p-methoxyphenol were used and the reaction temperature was room temperature.
- the yield of the cured product precursor C9 was 50.81 g, the viscosity was 792 mPa ⁇ s (25 ° C.), and the number average molecular weight was 1000.
- the concentrations of Si—OH groups were determined in the same manner as in Example 1, and are shown in Table 2.
- a cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- Comparative Example 4 In a 500 mL four-necked flask equipped with a three-one motor stirrer, dropping funnel, reflux condenser and thermometer, 124.80 g (533 mmol) of 3-acryloyloxypropyltrimethoxysilane, X-21-5841 manufactured by Shin-Etsu Chemical (both ends) Type / silanol-modified dimethyl silicone, functional group equivalent 500 g / mol) 22.00 g and 2-propanol 190.57 g were charged. The 4.8% tetramethylammonium hydroxide aqueous solution 10.07g was dripped here at room temperature, and it stirred.
- the yield of the cured product precursor C10 was 103.40 g, the viscosity was 5440 mPa ⁇ s (25 ° C.), and the number average molecular weight was 3000.
- the concentrations of Si—OH groups were determined in the same manner as in Example 1, and are shown in Table 2.
- dimethyl silicone having both ends modified with silanol was used instead of D monomer. Since dimethyl silicone is a condensate of D monomer, in order to compare the effect of copolycondensation of D monomer in the condensation step and the addition of pre-condensed D monomer, the number of moles of dimethyl silicone Instead, it is better to compare the number of moles of silicon atoms contained in dimethyl silicone in accordance with Example 1. In this sense, the number of moles of silicon in dimethyl silicone relative to 3-acryloyloxypropyltrimethoxysilane was set to 1: 0.56, the same as in Example 1. Therefore, in Table 2, 0.56 is enclosed in parentheses as the amount of D unit. A cured product was prepared in the same manner as in Example 1, and thermal shock resistance, pencil hardness and appearance evaluation were evaluated.
- Table 1 shows the value of w / (a + x + y + 2c), which is the relationship between the monomer composition and the copolycondensation catalyst used as raw materials for the cured product precursors in Examples and Comparative Examples, and the blending amount of each monomer.
- TMAH in the catalyst column used for condensation indicates tetramethylammonium hydroxide.
- Example 3 is a production example in which an end cap process using TMCS was performed between the condensation process and the curing process of the production method of the present invention.
- Table 3 shows the results of the thermal shock test of the cured products of Examples and Comparative Examples.
- Comparative Example 1 In Comparative Example 1, one of the three cured products had cracks before the thermal shock resistance test. In Comparative Example 5, cracks occurred before all the three cured products were subjected to the thermal shock resistance test. Comparative Example 5 is an example in which the raw materials used are the same as in Example 1 and the copolycondensation catalyst is basic. Compared with Example 1, the amount of Si—OH groups in the cured product precursor is greatly different. was there. Both the pencil hardnesses of the cured products showed the same hardness as 3H, but the results of thermal shock resistance evaluation differed greatly, indicating the superiority of Example 1 which is the cured product of the present invention.
- Table 4 shows the results of pencil hardness and appearance evaluation of the cured products of Examples and Comparative Examples.
- Example 4 Comparing Example 4 and Example 3, the monomer composition is almost the same. However, in Example 4, all of the M2 monomer was initially charged, whereas in Example 3, M monomer or M2 monomer was not used in the condensation step and M monomer was added in the end cap step. In Example 3, the hardness of the cured product is significantly higher. The reason is that the M monomer or M2 monomer in the condensation step has a function of stopping the extension of the condensed chain and lowering the molecular weight and the degree of crosslinking of the cured product precursor, whereas the cured product tends to be soft. In addition, since the M monomer or M2 monomer added after the condensation step does not exhibit such an effect, it is considered that a hard cured product can be obtained as a result.
- the production method of obtaining a cured product by performing the above-described end cap process and curing process is also excellent, and a cured product having high hardness as well as thermal shock resistance can be obtained. The effect became clear.
- the thermal shock-resistant cured product of the present invention can protect the substrate without peeling or cracking even when subjected to repeated thermal shocks at high temperatures, so that the protective film or adhesive part used in electronic parts and electronic devices that undergo a solder reflow process It is optimal as a constituent material. In addition, it is suitable for all applications where thermal shock occurs, from transportation machinery, aerospace, food processing and nuclear power generation.
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Abstract
Description
例えば、環境問題の観点から、電子部品を基板に接続するために用いるはんだは、従来のスズ-鉛系はんだから鉛フリーはんだへの切り替えが進んでいる。鉛フリーはんだの融点は、従来のスズ-鉛系はんだよりも高い220℃であり、これに伴って、鉛フリーはんだを使用する電子回路基板のリフロー加工温度が従来の230℃から260℃に上げられている。電子回路基板に用いられる材料について、この260℃での熱衝撃に耐えることが求められている。
また、エチレン性不飽和結合を有する基は、好ましくはアクリロイル基又はメタクリロイル基を有する基であり、更に好ましくは下記一般式(6)で表される有機基である。
一般式(6)において、好ましいR7はプロピレン基である。その理由は、プロピレン基を含む有機官能基を形成する化合物の入手又は合成が容易なためである。また、好ましいR6はメチル基又は水素原子であり、更に好ましくは水素原子である。
一般式(5)で表されるM2モノマーは、共縮合の際に、1分子から2個のMユニットを与えることができる。
縮合工程では、上記の一般式(1)~(5)で表されるモノマーの特定量を用い、酸触媒の存在下で共重縮合反応を起こさせて、硬化物前駆体を製造する。
縮合工程により得られた縮合物は、通常、-Si-OH基を含むので、この-Si-OH基の割合が高い場合には、-Si-OH基と、残部のMモノマーとを反応させるエンドキャップ工程により、好ましい耐熱衝撃性硬化物を与える硬化物前駆体を得ることができる。
(中和工程)縮合工程で得られた反応液を、アルカリにより中和する工程。
(水洗工程)中和液に含まれる縮合物を水により洗浄する工程。
(濃縮工程)縮合物を含む水系液体を濃縮する工程。脱溶を含む。
(溶剤置換工程)濃縮又は脱溶した濃縮物を別の有機溶剤で再溶解する工程。
(エンドキャップ工程)残存するSi-OH基を有する化合物に、Mモノマーを反応させる工程。
また、硬化物前駆体溶液は、保存安定性を損ねない範囲で、他の成分を含有してもよい。他の成分としては、重合性不飽和化合物、ラジカル重合禁止剤、酸化防止剤、紫外線吸収剤、光安定剤、レベリング剤、有機ポリマー、フィラー、金属粒子、顔料、重合開始剤、増感剤等が挙げられる。
上記酸化防止剤としては、2,6-ジ-tert-ブチル-4-メチルフェノールや、ペンタエリスリトールテトラキス(3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオネート)等のヒンダードフェノール系酸化防止剤、4,6-ビス(オクチルチオメチル)-o-クレゾール等のイオウ系二次酸化防止剤、リン系二次酸化防止剤等が挙げられる。これらは、1種のみ用いてもよく、2種以上を併用することもでき、ラジカル重合禁止剤及び酸化防止剤を用いると、硬化性組成物及び耐熱衝撃性硬化物の保存安定性、熱安定性等を向上させることができる。
活性エネルギー線の具体例としては、電子線、紫外線、可視光等が挙げられるが、紫外線が特に好ましい。紫外線照射装置としては、高圧水銀ランプ、メタルハライドランプ、UV無電極ランプ、LED等が挙げられる。照射エネルギーは、活性エネルギー線の種類や配合組成に応じて適宜設定すべきものであるが、一例として高圧水銀ランプを使用する場合を挙げると、UV-A領域の照射エネルギーで100~5,000mJ/cm2が好ましく、より好ましくは500~3,000mJ/cm2であり、更に好ましくは1000~3000mJ/cm2である。
また、硬化工程において熱硬化を採用する場合の硬化温度は、用いる熱重合開始剤の半減期を得るための分解温度に応じて適宜選択されるが、好ましくは30~200℃であり、より好ましくは40~150℃であり、更に好ましくは50~120℃である。
式(8)において、R1、R2及びR4は、それぞれ、水素原子、アルキル基、アラルキル基、シクロアルキル基、シクロアラルキル基、アリール基及びエチレン性不飽和結合を有する基の中から選択される基であり、R3及びR5は、それぞれ、水素原子、アルキル基、アラルキル基、シクロアルキル基、シクロアラルキル基及びアリール基の中から選択される基であり、R1、R2及びR4のうちの少なくとも一つはエチレン性不飽和結合を有する基である。R8は、水素原子、アルキル基、アラルキル基、シクロアルキル基、シクロアラルキル基、アリール基及びエチレン性不飽和結合を有する基の中から選択される基である。また、R1~R5及びR8が分子中に複数ある場合、これらの一部又は全てが同一であっても良いし、異なっていても良い。
また、R8は、上記のR1~R7のいずれかと同一であり、好ましくは水素原子である。
また、w、およびxは正の数であり、a,sは0または正の数であり、好ましくは、0<w/(a+x+s)≦10である。
また、上記sは、Mモノマーyモル及びM2モノマーcモルの全てが、共重縮合した場合、s=y+2cとなる。
また、bの好ましい範囲は、上記zの好ましい範囲と同様である。即ち、上記bの値は、上記各構成単位の含有量との関係において、好ましくは0.05≦b/(a+w+x+s)≦1.0であり、より好ましくは0.1≦b/(a+w+x+s)≦0.6である。
また、「AC-」はアクリロイルオキシプロピル基、「MAC-」はメタクリロイルオキシプロピル基を示す。
実施例及び比較例で合成された硬化物前駆体を構成するポリシロキサンの1H-NMR分析は、測定試料約1gと、内部標準物質であるヘキサメチルジシロキサン(以下、「HMDSO」という)約100mgとを、それぞれ精秤して、分析溶媒として重クロロホルムに溶解し、HMDSOのプロトンのシグナル強度を基準として行った。
また、数平均分子量は、ゲル浸透クロマトグラフィー(GPC)により測定し、標準ポリスチレン換算で算出した。
以下、各種評価方法について述べる。
実施例及び比較例で合成された硬化物前駆体に残存するSi-OH基濃度を、以下の方法で分析した。硬化物前駆体を含む反応液を濃縮した後、有機溶剤、水及び酸触媒を除いた硬化物前駆体をピリジンに溶解させた。そして、その硬化物前駆体のピリジン溶液に、一定濃度のトリメチルクロロシランのピリジン溶液を加えて反応させ、未反応のトリメチルクロロシランを加水分解後、蒸留で除いた後に、反応によって硬化物前駆体に増加したトリメチルシリル基濃度を1H-NMRで定量することによって決定した。
耐熱衝撃性の評価は、以下のように実施した。0.2mm厚のPTFE(ポリテトラフルオロエチレン)シートで10mm×10mmの型枠を作製して、その型枠をスライドガラス上に密着させて載せた。この枠内に硬化性組成物を入れ、へらで塗膜表面をならした。ここに無電極ランプバルブ(Hバルブ)、ランプ高さ10cm、積算光量3Jで紫外線を照射して、厚さ約130μmの硬化物を形成させ、PTFEシートの型枠を外し、塗膜を硬化させた。PTFEシートの型枠を外して膜厚約130μmの耐熱衝撃性試験用硬化物とした。そして、硬化物を恒温器に入れ250℃以上で2分間加熱し、引き続き260℃で30秒間加熱を行った。その後、室温で放冷し、硬化物のスライドガラスからの剥がれの有無やクラックの有無を目視で確認した。この工程を1サイクル(1回)として試験を行なった。耐熱衝撃性の評価は、各実施例及び比較例について、それぞれ3枚のサンプルを評価し、途中でクラックや剥がれが起きるまで最大10サイクルの試験を行った。その結果を表3に示した。
鉛筆硬度試験は、以下のように実施した。スライドガラス上に硬化性組成物をバーコーターを用いて塗布した後、無電極ランプバルブ(Hバルブ)、ランプ高さ10cm、積算光量3Jで紫外線を照射し、10μm厚の硬化物を作製した。硬化させた硬化物について、JIS K-5600-5-4「塗料一般試験方法:ひっかき硬度(鉛筆法)」に従い、三菱鉛筆製の鉛筆を用い、手かき法で行った。その結果を表4に示した。
表4における各硬化物の鉛筆硬度は、試験によって得られた鉛筆の硬度を記載した。
外観評価については、10回目耐熱衝撃試験を終わった時点で、硬化物を目視観察し、下記評価基準に従って評価した。
1;3個の硬化物にクラックも剥がれも認められなかった。
2;3個中の1個にクラックもしくは剥がれがあった。
3;3個中の2個にクラックもしくは剥がれがあった。
4;3個の硬化物の全部でクラックもしくは剥がれがあった。
1-1 硬化物前駆体の合成
スリーワンモーター撹拌機、滴下ロート、還流冷却器及び温度計を装着した500mL四つ口フラスコに、3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)及び2-プロパノール45.19gを仕込んだ。そして、湯浴を用いて昇温し、反応系内温が40℃を超えたところで、反応系を撹拌しながら、滴下ロートから0.8%塩酸水溶液36.19gを滴下した。約50℃にて滴下終了後、反応系を室温(約25℃、以下同じ)で、15時間放置した。ここにp-メトキシフェノール0.02gを添加して溶解した後、空気を吹き込みながら溶媒を減圧留去し、無色透明液体の硬化物前駆体C1を101.68g得た。得られた硬化物前駆体C1の粘度は1970mPa・s(25℃)であり、数平均分子量は1300であった。
1H-NMR分析の結果、アクリロイル基を有するTユニット(AC-SiO3/2)とジメチル基を有するDユニット(Me2-SiO2/2)の組成比は、それらのユニットを形成する原料の仕込み時のモル比に近いものであった(表2参照)。また、残存イソプロポキシ基量は、AC-SiO3/2の1モルに対し、0.03モルであった。
スリーワンモーター撹拌機、滴下ロート、還流冷却器及び温度計を装着した200mL四つ口フラスコに、ピリジン30mLを仕込んだ。トリメチルクロロシラン19mLを滴下ロートから室温で上記ピリジンに滴下し、トリメチルクロロシランのピリジン溶液を得た。一方、100mLなす形フラスコに、実施例1で合成した硬化物前駆体C1を20.00g入れた後、ピリジン30mLを加えて溶解し、硬化物前駆体C1のピリジン溶液を得た。このピリジン溶液を滴下ロートから上述のトリメチルクロロシランのピリジン溶液に室温で滴下した後、75℃で3時間加熱撹拌した。反応液に水3gを加え、更にN-ニトロソフェニルヒドロキシルアミンアルミニウム塩(商品名「Q-1301」、和光純薬工業株式会社製、以下単に「重合禁止剤」という)を0.002g加えた後、溶媒を減圧留去して濃縮した。残渣にジイソプロピルエーテル50.00gを加えて溶解した後、水20.00gを加えて、分液ロートを用いて洗浄した。同様の水洗操作を合計7回繰り返した。有機層に重合禁止剤を0.002g加えて溶解し、溶媒を減圧留去し、無色透明液体の硬化物前駆体(C1)のトリメチルシリル化物を得た。硬化物前駆体(C1)のトリメチルシリル化物のNMR測定により、反応によって増加したトリメチルシリル基濃度が得られるので、硬化物前駆体(C1)のSi-OH基濃度が、モル比で3-アクリロイルオキシプロピルトリメトキシシランモノマーの1モルに対して0.47モルであると決定し、表2に示した。
硬化物前駆体(C1)4gに、光ラジカル重合開始剤である2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン0.12gを配合し、硬化性組成物(B1)を調製した。
上記評価方法に従って、上記硬化性組成物(B1)を用いて硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン、ジメトキシジメチルシラン、2-プロパノール及び0.8%塩酸水溶液の使用量を、それぞれ、70.91g(303mmol)、81.07g(674mmol)、45.22g、及び40.99gとした以外は、実施例1と同様にして硬化物前駆体C2を得た。硬化物前駆体C2の収量は95.44gであり、粘度は207mPa・s(25℃)であり、数平均分子量は1300であった。実施例1と同様の方法でSi-OH基の濃度を決定して結果を表2に記載した。
そして、実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
実施例3は、後工程を含む製造例である。
実施例1の、1-2.Si-OH基濃度の測定と同じ方法で、硬化物前駆体C1の残存Si-OH基をトリメチルシリル化して、硬化物前駆体C3を得た。
スリーワンモーター撹拌機、滴下ロート、還流冷却器及び温度計を装着した200mL四つ口フラスコに、ピリジン30mLを仕込んだ。トリメチルクロロシラン19mL(150mmol)を滴下ロートから室温で上記ピリジンに滴下し、トリメチルクロロシランのピリジン溶液を得た。一方、100mLなす形フラスコに実施例1で合成した硬化物前駆体C1の20.00gを投入し、ピリジン30mLを加えて溶解し、硬化物前駆体C1のピリジン溶液を得た。このピリジン溶液を滴下ロートから上述のトリメチルクロロシランのピリジン溶液に室温で滴下した後、75℃で3時間加熱撹拌した。反応液に水3gを加え、更に重合禁止剤を0.002g加えた後、溶媒を減圧留去して濃縮した。残渣にジイソプロピルエーテル50gを加えて溶解した後、水20.00gを加えて、分液ロートを用いて洗浄した。同様の水洗操作を合計7回繰り返した。有機層に重合禁止剤を0.002g加えて溶解し、溶媒を減圧留去し、無色透明液体の硬化物前駆体(C1)のトリメチルシリル化物である、硬化物前駆体C3を得た。硬化物前駆体C3の収量は9.34gであり、粘度は336mPa・s(25℃)であり、数平均分子量は1400であった。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。評価結果を表3及び表4に記載した。尚、実施例3における硬化物前駆体C3は、硬化物前駆体C1のSi-OH基にMモノマーを反応させて得られていることから、表2のMユニットの量を括弧で囲んで示した。硬化物前駆体C1の20.0gに対するトリメチルクロロシラン19mlは、硬化物前駆体C1の全量に対して換算すると761mmolであり、硬化物前駆体C1に残るSi-OHに対しては大幅に過剰であるが、反応し、Mユニットとして硬化物前駆体C3に残るのは、硬化物前駆体C1に含まれていたSi-OHの等量分だけであり、反応後の硬化物前駆体C3ではSi-OHは0となる。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、0.8%塩酸水溶液36.19g、及びp-メトキシフェノール0.02gに代えて、3-アクリロイルオキシプロピルトリメトキシシラン56.73g(242mmol)、ジメトキシジメチルシラン16.21g(135mmol)、ヘキサメチルジシロキサン9.43g(58mmol)、2-プロパノール33.55g、0.8%塩酸水溶液19.15g、及びp-メトキシフェノール0.01gを用い、反応温度を室温とした以外は、実施例1と同様にして硬化物前駆体C4を得た。硬化物前駆体C4の収量は57.90gであり、粘度は207mPa・s(25℃)であり、数平均分子量は1000であった。実施例1と同様の方法でSi-OH基の濃度を決定し、表2に記載した。尚、ヘキサメチルジシロキサンの1分子は、共重縮合の際に2個のMユニットを与える。
また、実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、0.8%塩酸水溶液36.19g、及びp-メトキシフェノール0.02gに代えて、3-メタクリロイルオキシプロピルトリメトキシシラン62.09g(250mmol)、ジメトキシジメチルシラン60.11g(500mmol)、テトラメトキシシラン38.06g(250mmol)、2-プロパノール60.10g、0.8%塩酸水溶液49.95g、及びp-メトキシフェノール0.02gを用いた以外は、実施例1と同様にして硬化物前駆体C5を得た。硬化物前駆体C5の収量は97.60gであり、粘度は28900mPa・s(25℃)であり、数平均分子量は2500である。実施例1と同様の方法でSi-OH基の濃度を決定して表2に記載した。尚、表1のTユニットの量が括弧で囲んで示してあるのは、他の実施例がTモノマーとして3-アクリロイルオキシプロピルトリメトキシシランを用いたのに対して、実施例5では3-メタクリロイルオキシプロピルトリメトキシシランを用いたことを示すためである。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、0.8%塩酸水溶液36.19g、及びp-メトキシフェノール0.02gに代えて、3-アクリロイルオキシプロピルトリメトキシシラン141.82g(605mol)、ジメトキシジメチルシラン162.13g(1349mmol)、テトラメチルジシロキサン8.13g(60.5mmol)、2-プロパノール88.86g、0.8%塩酸水溶液83.08g、及びp-メトキシフェノール0.04gを用い、反応温度を室温とした以外は、実施例1と同様にして硬化物前駆体C6を得た。硬化物前駆体C6の収量は198.6gであり、粘度は115mPa・s(25℃)であり、数平均分子量は1360であった。実施例1と同様の方法でSi-OH基の濃度を決定して、表2に記載した。尚、テトラメチルジシロキサンの1分子は、共重縮合の際に2個のMユニットを与えるが、実施例6では表1のモノマー構造欄で示したヘキサメチルジシロキサンとは異なる、テトラメチルジシロキサンを用いたために、生成するMユニットはH(Me)2-Si-O-となり、Si-H結合を有する点が異なるので表2のMユニットの量は括弧で囲んで示した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、0.8%塩酸水溶液36.19g、及びp-メトキシフェノール0.02gに代えて、3-アクリロイルオキシプロピルトリメトキシシラン70.30g(300mmol)、2-プロパノール26.01g、0.8%塩酸水溶液16.35g、及びp-メトキシフェノール0.01gを用いた以外は、実施例1と同様にして硬化物前駆体C7を得た。硬化物前駆体C7の収量は50.56gであり、粘度は5570mPa・s(25℃)であり、数平均分子量は1500であった。実施例1と同様の方法でSi-OH基の濃度を決定して、表2に記載した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、及び0.8%塩酸水溶液36.19gに代えて、3-アクリロイルオキシプロピルトリメトキシシラン100.85g(430mmol)、トリエトキシメチルシラン76.74g(430mmol)、2-プロパノール53.28g、及び0.8%塩酸水溶液46.91gを用いた以外は、実施例1と同様にして硬化物前駆体C8を得た。硬化物前駆体C8の収量は101.40gであり、粘度は20000mPa・s超(25℃)であり、数平均分子量は1400であった。実施例1と同様の方法でSi-OH基の濃度を決定して、表2に記載した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)、2-プロパノール45.19g、0.8%塩酸水溶液36.19g、及びp-メトキシフェノール0.02gに代えて、3-アクリロイルオキシプロピルトリメトキシシラン48.94g(209mmol)、トリエトキシメチルシラン18.62g(104mmol)、ヘキサメチルジシロキサン8.48g(52mmol)、2-プロパノール44.83g、0.8%塩酸水溶液18.02、及びp-メトキシフェノール0.01gを用い、反応温度を室温とした以外は、実施例1と同様にして硬化物前駆体C9を得た。硬化物前駆体C9の収量は50.81gであり、粘度は792mPa・s(25℃)であり、数平均分子量は1000であった。実施例1と同様の方法でSi-OH基の濃度を決定して、表2に記載した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
スリーワンモーター撹拌機、滴下ロート、還流冷却器及び温度計を装着した500mL四つ口フラスコに、3-アクリロイルオキシプロピルトリメトキシシラン124.80g(533mmol)、信越化学製X-21-5841(両末端型/シラノール変性ジメチルシリコーン、官能基当量500g/mol)22.00g及び2-プロパノール190.57gを仕込んだ。ここに4.8%テトラメチルアンモニウムヒドロキシド水溶液10.07gを室温で滴下し、攪拌した。1時間攪拌してから、水19.18gを滴下し、4時間攪拌した後、5%硫酸水溶液5.49gを加えた。ここにp-メトキシフェノール0.02gを添加して溶解した後、空気を吹き込みながら溶媒を減圧留去した。ここにジイソプロピルエーテル176.00gを加えて溶解した後、水118.00gを加えて分液ロートを用いて洗浄した。同様の操作を合計7回繰り返した後、有機層にp-メトキシフェノール0.03gを添加して溶解した後、空気を吹き込みながら溶媒を減圧留去し、無色透明液体の硬化物前駆体C10を得た。硬化物前駆体C10の収量は103.40gであり、粘度は5440mPa・s(25℃)であり、数平均分子量は3000であった。実施例1と同様の方法でSi-OH基の濃度を決定して、表2に記載した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
スリーワンモーター撹拌機、滴下ロート、還流冷却器、温度計を装着した500mL四つ口フラスコに、3-アクリロイルオキシプロピルトリメトキシシラン113.46g(484mmol)、ジメトキシジメチルシラン32.43g(270mmol)及び2-プロパノール45.19gを仕込んだ。ここに1.2%テトラメチルアンモニウムヒドロキシド水溶液36.34gを室温で滴下し、攪拌した。5時間攪拌した後、5%硫酸水溶液4.93gを加えた。ここにp-メトキシフェノール0.01gを添加して溶解した後、空気を吹き込みながら溶媒を減圧留去した。ここにジイソプロピルエーテル160.00gを加えて溶解した後、水100.00gを加えて分液洗浄した。同様の操作を合計7回繰り返した後、有機層にp-メトキシフェノール0.01gを添加して溶解した後、空気を吹き込みながら溶媒を減圧留去し、無色透明液体の硬化物前駆体C11を得た。硬化物前駆体C11の収量は94.30gであり、粘度は13000mPa・s(25℃)であり、数平均分子量は3300であった。実施例1と同様の方法でSi-OHの濃度を決定して結果を組成式と共に表2に記載した。
実施例1と同様にして硬化物を作製し、耐熱衝撃性、鉛筆硬度及び外観評価について評価した。
、及び各モノマーの配合量の関係であるw/(a+x+y+2c)の値を表1に示した。
残存Si-OH濃度は濃縮して有機溶剤および水、酸触媒を除いた硬化物前駆体をピリジンに溶解し、一定濃度のトリメチルクロロシランのピリジン溶液を加えて反応させ、未反応のトリメチルクロロシランを加水分解後、蒸留で除いた後に、反応によって硬化物前駆体に増加したトリメチルシリル基濃度を1H-NMRで定量することによって決定した。
Claims (6)
- 下記一般式(1)で表されるモノマー、下記一般式(2)で表されるモノマー、下記一般式(3)で表されるモノマー、下記一般式(4)で表されるモノマー及び下記一般式(5)で表されるモノマーを、それぞれ、aモル、wモル、xモル、yモル及びcモルの割合で、酸触媒の存在下に、共重縮合させて硬化物前駆体を得る縮合工程と、
前記硬化物前駆体が有するエチレン性不飽和結合の少なくとも一部を重合させて硬化物前駆体を硬化させる硬化工程と、を備え、
w及びxは正の数であり、a、y及びcは0又は正の数であり、且つ、a、w、x、y及びcの関係が0<w/(a+x+y+2c)≦10であることを特徴とする耐熱衝撃性硬化物の製造方法。
- 上記硬化物前駆体が、Si-OH基をzモル含み、
a、w、x、y、c及びzの関係が0.1≦z/(a+w+x+y+2c)≦1.0である、請求項1に記載の耐熱衝撃性硬化物の製造方法。
- 上記一般式(1)で表されるモノマーの使用量aが0であり、w、x、y及びcの関係が0.1≦w/(x+y+2c)≦2である、請求項1~3のいずれか一項に記載の耐熱衝撃性硬化物の製造方法。
- 上記縮合工程と上記硬化工程との間に、上記一般式(4)で表されるモノマー及び上記一般式(5)で表されるモノマーから選ばれる少なくとも1種と、Si-OH基とを反応させるエンドキャップ工程を更に備える、請求項1~4のいずれか一項に記載の耐熱衝撃性硬化物の製造方法。
- 請求項1~5のいずれか一項の方法で製造された、耐熱衝撃性硬化物。
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