WO2012105626A1 - ポリエステル樹脂組成物 - Google Patents
ポリエステル樹脂組成物 Download PDFInfo
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- WO2012105626A1 WO2012105626A1 PCT/JP2012/052315 JP2012052315W WO2012105626A1 WO 2012105626 A1 WO2012105626 A1 WO 2012105626A1 JP 2012052315 W JP2012052315 W JP 2012052315W WO 2012105626 A1 WO2012105626 A1 WO 2012105626A1
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- polyester resin
- acid
- aliphatic
- resin composition
- weight
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
- Y10T428/1345—Single layer [continuous layer]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
Definitions
- the present invention relates to a resin composition containing an aliphatic polyester resin that can provide a film having excellent mechanical properties.
- plastic films are excellent in strength, water resistance, moldability, transparency, cost, etc., and are used in many applications as bags and containers.
- typical plastic films include those made of polyethylene, polypropylene, polystyrene, polyvinyl chloride, and the like.
- these resins are difficult to decompose in a natural environment, and there are problems such as generation of harmful gases and damage to the incinerator when incineration is performed.
- aliphatic polyester resins such as polybutylene succinate and polybutylene succinate adipate
- aliphatic oxycarboxylic acid resins such as polylactic acid
- aromatic aliphatic copolymer polyesters such as polybutylene adipate terephthalate
- Patent Document 1 A technique for solving the above problem by using a resin is known (see, for example, Patent Document 1).
- aromatic aliphatic copolyester resins such as polybutylene adipate terephthalate have been known to improve biodegradability by the presence of aliphatic units between aromatic units.
- aromatic aliphatic polyester resin excellent in crystallinity and moldability an aromatic aliphatic copolymer polyester resin having a low aromatic dicarboxylic acid component content, and an aliphatic oxycarboxylic acid resin Have been disclosed in a predetermined ratio (for example, see Patent Document 2).
- Aliphatic polyester resins such as polybutylene succinate and polybutylene succinate adipate have a high crystallization rate and good moldability, but the tear strength of the film after molding may be insufficient. It was.
- aliphatic oxycarboxylic acid resins such as polylactic acid have high rigidity and can be improved in film strength by being included in the film.
- the crystallization rate is slow and the moldability is poor. Even when the technique described in Patent Document 1 is used, the crystallization rate is still slow and the moldability may be poor.
- the flexibility is sufficient, but the tensile strength is weak, and a so-called waistless film may be formed. Even when the described technique is used, the tear strength of the film may be inferior, and the impact strength has room for improvement.
- An object of the present invention is to provide a resin composition having excellent tear strength and excellent impact strength when molded into a film, and a film or bag formed by molding the resin composition.
- the present inventor contains the polyester resin (A), the polyester resin (B), and the polyester resin (C) in a predetermined ratio, and the polyester resin (A). It was found that by making the amount of the structural unit derived from succinic acid within a predetermined range, a film having excellent tear strength and excellent impact strength can be obtained.
- the gist of the present invention is as follows.
- An aromatic aliphatic copolyester resin comprising an aliphatic diol unit, an aliphatic dicarboxylic acid unit, and an aromatic dicarboxylic acid unit, wherein the aromatic dicarboxylic acid unit is contained in an amount of 5 mol% or more and 95 mol in all dicarboxylic acid units.
- the bag when a resin composition according to the present invention is used as a film and then formed into a bag, the bag is excellent in tear strength and can be prevented from tearing.
- the impact strength is excellent, it is possible to prevent the bag from tearing when the bag is opened or when an object is packed in the bag.
- molding the resin composition which concerns on this invention is excellent in tear strength, and can be used suitably.
- the polyester resin composition of the present invention contains the following polyester resins (A) to (C).
- the polyester resin (A) is an aliphatic polyester resin containing an aliphatic diol unit and an aliphatic dicarboxylic acid unit, and among all the aliphatic dicarboxylic acid-derived units, succinic acid-derived units are contained in an amount of 5 mol% to 86 mol%.
- the polyester resin (B) is an aromatic aliphatic copolymerized polyester-based resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, and an aromatic dicarboxylic acid unit. It is a polyester resin containing 5 mol% or more and 95 mol% or less of an acid unit.
- the polyester resin (C) is a polyester resin containing an aliphatic oxycarboxylic acid. Further, in the polyester resin composition of the present invention, the polyester resin (A) is 10 to 89% by weight and the polyester resin (B) is 11 to 90% by weight with respect to the total of the polyester resin (A) and the polyester resin (B). And the polyester resin (C) is contained in an amount of 1 to 40% by weight based on the total of the polyester resin (A), the polyester resin (B) and the polyester resin (C).
- an aliphatic diol refers to an aliphatic hydrocarbon group having two hydroxyl groups bonded.
- a straight chain aliphatic hydrocarbon group is usually used, but it has a branched structure. May have a ring structure, or may have a plurality of them.
- the aliphatic dicarboxylic acid unit refers to an aliphatic hydrocarbon group in which two carboxyl groups are bonded.
- a straight chain aliphatic hydrocarbon group is usually used. May have a ring structure, or may have a plurality of them.
- the polyester resin according to the present invention is a polymer having repeating units, and each repeating unit is also referred to as a compound unit for the compound from which each repeating unit is derived.
- a repeating unit derived from an aliphatic diol is an “aliphatic diol unit”
- a repeating unit derived from an aliphatic dicarboxylic acid is an “aliphatic dicarboxylic acid unit”
- a repeating unit derived from an aromatic dicarboxylic acid is The “aromatic dicarboxylic acid unit” and the repeating unit derived from the aliphatic oxycarboxylic acid are also referred to as “aliphatic oxycarboxylic acid unit”.
- polyester resin composition of the present invention is a resin composition characterized by containing specific amounts of a polyester resin (A), a polyester resin (B), and a polyester resin (C). ) And polyester resin (B), the polyester resin (A) is contained in an amount of 10 to 89% by weight, the polyester resin (B) is contained in an amount of 11 to 90% by weight, and the polyester resin (A) and the polyester resin ( A polyester resin composition containing 1 to 40% by weight of the polyester resin (C) with respect to the total of B) and the polyester resin (C).
- the content ratio of the polyester resin (A) and the polyester resin (B) is usually 10 to 89% by weight of the polyester resin (A) and the polyester resin (A) with respect to the total of the polyester resin (A) and the polyester resin (B). B) is contained in an amount of 11 to 90% by weight.
- the content ratio of the polyester resin (A) is preferably 40% by weight or more, more preferably 51% by weight or more, and particularly preferably. Is 61% by weight or more.
- the content ratio of the polyester resin (B) is preferably 15% by weight or more, more preferably 18% by weight or more, and particularly preferably 20% by weight or more.
- the polyester resin (A) is usually contained in an amount of 1 to 40% by weight, preferably 3 to 35% by weight, more preferably 6 to 30% by weight, based on the total of (B) and the polyester resin (C).
- the polyester resin composition of the present invention may contain various compounds other than the polyester resin (A), the polyester resin (B), and the polyester resin (C). These other components will be described later.
- polyester resin (A) used in the present invention is an aliphatic polyester-based resin containing an aliphatic diol unit and an aliphatic dicarboxylic acid unit, and 5 mol% of succinic acid-derived units in all aliphatic dicarboxylic acid-derived units. More than 86 mol% is contained.
- the polyester resin (A) may be a mixture of polyester resins having different amounts of succinic acid units, for example, an aliphatic polyester-based resin not containing dicarboxylic acid structural units other than those derived from succinic acid, and those other than those derived from succinic acid. It is also possible to blend with an aliphatic polyester-based resin containing a structural unit and adjust the amount of succinic acid-derived structural units in the polyester resin (A) within the above predetermined range.
- the polyester resin (A) is a polyester resin containing an aliphatic diol unit represented by the following formula (1) and an aliphatic dicarboxylic acid unit represented by the following formula (2).
- R 1 represents a divalent aliphatic hydrocarbon group.
- the polyester resin (A) may contain two or more types of aliphatic diol units represented by the formula (1).
- R 2 is a divalent aliphatic hydrocarbon group.
- the aliphatic diol unit and the aliphatic dicarboxylic acid unit represented by the above formulas (1) and (2) may be derived from a compound derived from petroleum or a compound derived from a plant raw material. Although not desirable, it is desirable to include compounds derived from plant materials.
- the polyester resin (A) is a copolymer
- the polyester resin (A) may contain two or more aliphatic dicarboxylic acid units represented by the formula (2).
- the aliphatic dicarboxylic acid unit represented by the formula (2) contains a structural unit derived from succinic acid in an amount of 5 mol% to 86 mol% with respect to the total aliphatic dicarboxylic acid unit.
- the structural unit derived from succinic acid is preferably at least 10 mol%, more preferably at least 50 mol%, even more preferably at least 64 mol%, particularly preferably the total aliphatic dicarboxylic acid unit. It is 68 mol% or more, preferably 83 mol% or less, more preferably 81 mol% or less, and particularly preferably 79 mol% or less.
- aliphatic diol which gives the diol unit of Formula (1)
- a C2-C10 aliphatic diol is preferable, C4-C6 is preferable.
- Aliphatic diols are particularly preferred.
- ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol and the like can be mentioned, among which 1,4-butanediol is particularly preferable.
- Two or more kinds of the aliphatic diols can be used.
- C2-C40 aliphatic dicarboxylic acid is preferable, C4-C10 aliphatic dicarboxylic acid is especially preferable.
- adipic acid, suberic acid, sebacic acid, dodecanedioic acid, dimer acid and the like can be mentioned, among which adipic acid and sebacic acid are preferable, and adipic acid is particularly preferable. Two or more kinds of the dicarboxylic acids can be used.
- the polyester resin (A) in the present invention may have a repeating unit (aliphatic oxycarboxylic acid unit) derived from an aliphatic oxycarboxylic acid.
- aliphatic oxycarboxylic acid unit derived from an aliphatic oxycarboxylic acid.
- Specific examples of the aliphatic oxycarboxylic acid that gives an aliphatic oxycarboxylic acid unit include, for example, lactic acid, glycolic acid, 2-hydroxy-n-butyric acid, 2-hydroxycaproic acid, 6-hydroxycaproic acid, 2-hydroxy- Examples include 3,3-dimethylbutyric acid, 2-hydroxy-3-methylbutyric acid, 2-hydroxyisocaproic acid, and the like, or lower alkyl esters or intramolecular esters thereof.
- any of D-form, L-form and racemic form may be sufficient, and the form may be solid, liquid, or aqueous solution.
- lactic acid or glycolic acid is particularly preferred.
- These aliphatic oxycarboxylic acids can be used alone or as a mixture of two or more.
- the amount of the aliphatic oxycarboxylic acid unit is preferably 20 mol% or less, more preferably 10 mol% or less, particularly preferably in all repeating units constituting the polyester resin (A) from the viewpoint of moldability. 5 mol% or less.
- the polyester resin (A) in the present invention is “trifunctional or higher aliphatic polyhydric alcohol”, “trifunctional or higher aliphatic polyvalent carboxylic acid or acid anhydride thereof” or “trifunctional or higher aliphatic polyvalent alcohol”.
- trimerizing “oxycarboxylic acid” the melt viscosity may be increased, or the chain length may be extended by a coupling agent.
- trifunctional aliphatic polyhydric alcohol examples include trimethylolpropane and glycerin, and specific examples of the tetrafunctional aliphatic polyhydric alcohol include pentaerythritol. These may be used alone or in combination of two or more.
- trifunctional aliphatic polyvalent carboxylic acid or its acid anhydride examples include propanetricarboxylic acid or its acid anhydride
- tetrafunctional polyvalent carboxylic acid or its acid anhydride examples include: Examples include cyclopentanetetracarboxylic acid or acid anhydrides thereof. These may be used alone or in combination of two or more.
- the trifunctional aliphatic oxycarboxylic acid includes (i) a type having two carboxyl groups and one hydroxyl group in the same molecule, and (ii) one carboxyl group and two hydroxyl groups. Any type can be used, but from the viewpoint of moldability, mechanical strength and appearance of the molded product, (i) two carboxyl groups and one hydroxyl group such as malic acid are contained in the same molecule. The type which has is preferable, and, specifically, malic acid is preferably used.
- the tetrafunctional aliphatic oxycarboxylic acid component includes (i) a type in which three carboxyl groups and one hydroxyl group are shared in the same molecule, and (ii) two carboxyl groups and two hydroxyl groups.
- a group that shares a group in the same molecule; (iii) a group that shares three hydroxyl groups and one carboxyl group in the same molecule, and any type can be used. What has two or more is preferable and a citric acid, tartaric acid, etc. are mentioned more specifically. These may be used alone or in combination of two or more.
- the amount of the structural unit derived from such a tri- or higher functional component is 100 mol% based on all structural units constituting the polyester resin (A), and the lower limit is usually 0 mol% or more, preferably 0.01 mol% or more.
- the upper limit is usually 5 mol% or less, preferably 2.5 mol% or less.
- Examples of the coupling agent include diisocyanate, oxazoline, diepoxy compound, acid anhydride and the like. Specifically, 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, hydrogen Xylylene diisocyanate, hexamethylene diisocyanate and the like. These addition amounts are 0.1 to 5 parts by weight per 100 parts by weight of the polyester resin (A).
- the polyester resin (A) has a structural unit derived from succinic acid, has a structural unit derived from the dicarboxylic acid component other than succinic acid, and a structural unit derived from the diol component, and has a structure derived from the polyhydric alcohol component.
- a unit, a structural unit derived from the polyvalent carboxylic acid component, a structural unit derived from an aliphatic oxycarboxylic acid component, and a coupling agent are optionally included.
- the polyester resin (A) used in the present invention can be produced by a known method.
- a general method of melt polymerization in which the above-mentioned aliphatic dicarboxylic acid containing succinic acid and an aliphatic diol are esterified and / or transesterified, followed by a polycondensation reaction under reduced pressure,
- a method of production by melt polymerization carried out in the absence of solvent is preferred from the viewpoint of economy and simplicity of the production process.
- the average molecular weight of the polyester resin (A) can be measured by gel permeation chromatography (GPC), and the weight average molecular weight of polystyrene as a standard substance is usually 10,000 or more and 1,000,000 or less. However, since it is advantageous in terms of moldability and mechanical strength, it is preferably 20,000 or more and 500,000 or less, more preferably 50,000 or more and 400,000 or less.
- the melt flow rate (MFR) of the polyester resin (A) is usually 0.1 g / 10 min or more and usually 100 g / 10 min or less when measured at 190 ° C. and 2.16 kg. From the viewpoint of moldability and mechanical strength, it is preferably 50 g / 10 min or less, particularly preferably 30 g / 10 min or less.
- the melting point of the polyester resin (A) is preferably 70 ° C. or higher, more preferably 75 ° C. or higher, preferably 170 ° C. or lower, more preferably 119 ° C. or lower, and particularly preferably lower than 100 ° C.
- at least one melting point is preferably within the above range.
- the elastic modulus is preferably 180 to 500 MPa. When the melting point is out of the range, the moldability is inferior, when the elastic modulus is 180 MPa or less, problems easily occur in the moldability and bag-making property, and when the elastic modulus is 500 MPa or more, it is difficult to obtain the effect of improving the tear strength and impact strength.
- the method for adjusting the melting point and elastic modulus of the polyester resin (A) is not particularly limited.
- the type of copolymerization component other than succinic acid can be selected, the copolymerization ratio of each can be adjusted, It can be adjusted by combining them.
- polyester resin (B) used in the present invention is an aromatic aliphatic copolymer polyester resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, and an aromatic dicarboxylic acid unit.
- the main component is an aromatic aliphatic copolyester composed of an aromatic dicarboxylic acid unit, and preferably has biodegradability.
- R 3 represents a divalent aliphatic hydrocarbon group.
- the polyester resin (B) is a copolymer, two or more kinds of R 3 may be contained in the polyester resin (B).
- R 4 represents a divalent aliphatic hydrocarbon group.
- the polyester resin (B) is a copolymer, two or more kinds of R 4 may be contained in the polyester resin (B).
- R 5 represents a divalent aromatic hydrocarbon group.
- the polyester resin (B) is a copolymer, two or more kinds of R 5 may be contained in the polyester resin (B).
- the diol that gives the diol unit of the formula (3) is not particularly limited, but those having 2 to 10 carbon atoms are preferred from the balance of cost and mechanical strength.
- ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol and the like can be mentioned.
- diols having 2 to 4 carbon atoms are preferable, ethylene glycol and 1,4-butanediol are more preferable, and 1,4-butanediol is particularly preferable.
- the dicarboxylic acid that gives the dicarboxylic acid unit of the formula (4) is not particularly limited, but preferably has 2 to 12 carbon atoms from the balance between cost and biodegradability.
- succinic acid, adipic acid, suberic acid, sebacic acid, dodecanedioic acid and the like can be mentioned.
- sebacic acid or adipic acid is preferred.
- the ring structure of R 5 is preferably 2 or less, and more specifically, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, etc.
- R 5 is preferably a phenylene group, and more specifically, for example, terephthalic acid and isophthalic acid are preferable, and terephthalic acid is particularly preferable.
- the aromatic dicarboxylic acid by which a part of aromatic ring was substituted by the sulfonate may be sufficient.
- Two or more types of aliphatic dicarboxylic acids, aliphatic diols, and aromatic dicarboxylic acids can be used.
- the polyester resin (B) may have an aliphatic oxycarboxylic acid unit.
- Specific examples of the aliphatic oxycarboxylic acid that gives an aliphatic oxycarboxylic acid unit include lactic acid, glycolic acid, 2-hydroxy-n-butyric acid, 2-hydroxycaproic acid, 6-hydroxycaproic acid, 2-hydroxy-3, Examples thereof include 3-dimethylbutyric acid, 2-hydroxy-3-methylbutyric acid, 2-hydroxyisocaproic acid, or a mixture thereof.
- these lower alkyl esters or intramolecular esters may be used.
- any of D-form, L-form and racemic form may be sufficient, and the form may be any of solid, liquid or aqueous solution.
- lactic acid or glycolic acid is preferable.
- These aliphatic oxycarboxylic acids can be used alone or as a mixture of two or more.
- the amount of the aliphatic oxycarboxylic acid is preferably 20 mol% or less, more preferably 10 mol% or less in all the constituent components constituting the polyester resin (B).
- the polyester resin (B) is similar to the polyester resin (A) in that “trifunctional or higher aliphatic polyhydric alcohol”, “trifunctional or higher aliphatic polyvalent carboxylic acid or acid anhydride thereof” or “trifunctional” is used.
- the melt viscosity may be increased by copolymerizing the above ⁇ aliphatic polyvalent oxycarboxylic acid '', and the chain length may be extended by a coupling agent such as diisocyanate or diepoxy compound. May be.
- the content of the aromatic dicarboxylic acid unit in the polyester resin (B) is preferably from the viewpoint of the melting point and biodegradability with respect to the total (100 mol%) of the aliphatic dicarboxylic acid unit and the aromatic dicarboxylic acid unit. It is 5 mol% or more, more preferably 35 mol% or more, particularly preferably 40 mol% or more, preferably 95 mol% or less, more preferably 65 mol% or less, and particularly preferably 60 mol% or less.
- the polyester resin (B) can be produced by a known production method in the same manner as the polyester resin (A).
- the average molecular weight of the polyester resin (B) can be measured by gel permeation chromatography (GPC), and the weight average molecular weight using polystyrene as a standard substance is usually 5,000 or more and 1,000,000 or less. However, since it is advantageous in terms of moldability and mechanical strength, it is preferably 10,000 or more and 500,000 or less.
- melt flow rate (MFR) of the polyester resin (B) used in the present invention is measured at 190 ° C. and 2.16 kg, the lower limit is usually 0.1 g / 10 min or more, and the upper limit is usually 100 g / 10 min. It is preferable that it is below, More preferably, it is 50 g / 10min or less, Most preferably, it is 30 g / 10min or less.
- the melt flow rate (MFR) of the polyester resin (B) can be adjusted by the molecular weight.
- the melting point of the polyester resin (B) is preferably 70 ° C. or higher, more preferably 75 ° C. or higher, preferably 205 ° C. or lower, more preferably 180 ° C. or lower, and particularly preferably 140 ° C. or lower. If the melting point is 70 ° C. or lower, the moldability and heat resistance of the composition are poor, and if it is 205 ° C. or higher, the melting point difference from other components becomes large and the moldability is poor.
- the melting point of the polyester resin (B) can be adjusted by the amount of aromatic dicarboxylic acid or oxycarboxylic acid.
- polyester resin (C) used in the present invention is mainly composed of a polyester resin composed of aliphatic oxycarboxylic acid units.
- Examples of the aliphatic oxycarboxylic acid that gives an aliphatic oxycarboxylic acid unit include lactic acid, glycolic acid, 2-hydroxy-n-butyric acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 5-hydroxy Valeric acid, 2-hydroxycaproic acid, 6-hydroxycaproic acid, 3-hydroxyhexanoic acid, 2-hydroxy-3,3-dimethylbutyric acid, 2-hydroxy-3-methylbutyric acid, 2-hydroxyisocaproic acid, etc. Or these lower alkyl ester or intramolecular ester is mentioned.
- any of D-form, L-form and racemic form may be sufficient, and the form may be solid, liquid, or aqueous solution.
- lactic acid or glycolic acid is particularly preferable, and lactic acid is most preferable.
- These aliphatic oxycarboxylic acids can be used alone or as a mixture of two or more.
- the polyester resin (C) may have an aliphatic oxycarboxylic acid unit derived from a tri- or higher functional aliphatic oxycarboxylic acid component.
- the trifunctional aliphatic oxycarboxylic acid component includes (i) a type having two carboxyl groups and one hydroxyl group in the same molecule, and (ii) a type having one carboxyl group and two hydroxyl groups. Any type can be used, but from the viewpoint of improving the quality by reducing coloring and foreign matter of the polyester resin (C), (i) two carboxyl groups such as malic acid and a hydroxyl group Is preferably a type having one in the same molecule, and more specifically, malic acid or the like is preferably used.
- the tetrafunctional aliphatic oxycarboxylic acid component includes (i) a type in which three carboxyl groups and one hydroxyl group are shared in the same molecule, and (ii) two carboxyl groups and two hydroxyl groups. It is divided into a type sharing a group in the same molecule, and (iii) a type sharing three hydroxyl groups and one carboxyl group in the same molecule, and any type can be used. Specific examples include citric acid and tartaric acid. These may be used alone or in combination of two or more.
- the polyester resin (C) may contain other structural units derived from the above aliphatic polyester or aromatic aliphatic polyester.
- the content of the other structural unit in the polyester resin (C) is 100 mol% in total of the structural unit derived from the aliphatic oxycarboxylic acid and the other structural unit, and the lower limit is usually 0 mol% or more, preferably It is 0.01 mol% or more, and an upper limit is 5 mol% or less normally, Preferably it is 2.5 mol% or less.
- the polyester resin (C) can be obtained by a method of directly dehydrating polycondensation of the above raw materials, a method of ring-opening polymerization of a cyclic dimer of lactic acid or hydroxycarboxylic acid, production by microorganisms, or the like.
- the lower limit is usually 0.1 g / 10 min or more, and the upper limit is usually 100 g / 10 min.
- it is preferably 50 g / 10 min or less, particularly preferably 30 g / 10 min or less.
- the resin composition according to the present invention includes lubricants, fillers (fillers), plasticizers, antistatic agents, antioxidants, light stabilizers, ultraviolet absorbers, dyes, pigments, hydrolysis inhibitors, and the like.
- Various additives, synthetic resin such as polycaprolactone, polyamide, polyvinyl alcohol, cellulose ester, animal / plant material fine powder such as starch, cellulose, paper, wood powder, chitin / chitosan, coconut shell powder, walnut shell powder, etc.
- a mixture thereof may be included as “other components”. These can be arbitrarily used as long as the effects of the present invention are not impaired. These may be used alone or in combination of two or more.
- the amount of these additives is usually 0.01% by weight or more and 40% by weight based on the total amount of the biodegradable resin composition in order not to impair the physical properties of the biodegradable resin composition. It is preferable that it is below wt%.
- Lubricant For example, when a lubricant is included in the resin composition according to the present invention, the moldability when the resin composition is made into a film and then molded into a bag can be improved. Moreover, the opening of the bag can be easily opened, and the usability of the bag can be improved. Furthermore, if the opening of the bag is easy to open, the inspection at the time of manufacturing the bag becomes easy.
- paraffins such as paraffin oil and solid paraffin, higher fatty acids such as stearic acid and palmitic acid, higher alcohols such as palmityl alcohol and stearyl alcohol, calcium stearate, zinc stearate, barium stearate, aluminum stearate, Metal salts of fatty acids such as magnesium stearate and sodium palmitate, fatty acid esters such as butyl stearate, glycerin monostearate and diethylene glycol monostearate, stearamide, methylene bisstearamide, ethylene bisstearamide, oxystearic acid Waxes such as fatty acid amides such as ethylenediamide, methylolamide, oleylamide, stearic acid amide, erucic acid amide, carnauba wax, montan wax, etc.
- paraffins such as paraffin oil and solid paraffin
- higher fatty acids such as stearic acid and palmitic acid
- alcohols such as palmityl alcohol and ste
- a lubricant and wax may be used individually by 1 type, and may be used 2 or more types by arbitrary ratios and combinations. Of these, erucic acid amide is particularly preferred. These lubricants are usually used in an amount of 0.01 to 2% by weight, preferably 0.05 to 0.5% by weight in the resin composition.
- the resin composition according to the present invention contains a filler, it can contribute to the stabilization of the film formation by improving the fluidity and crystallization speed of the resin composition, and the reduction of the anisotropy of film mechanical properties. it can. Moreover, when a resin composition is used as a film, blocking between films can be prevented. Alternatively, when the film is formed into a bag, the opening of the bag can be easily opened. Furthermore, the film and the bag can be colored to improve the light shielding property and the light reflecting property.
- the filler there are fibrous, powdery, plate-like, and needle-like fillers, and powdery and plate-like fillers are particularly preferable.
- the particulate filler mineral particles such as talc, zeolite, diatomaceous earth, kaolin, clay, silica, quartz powder, metal carbonate particles such as calcium carbonate, magnesium carbonate, heavy calcium carbonate, calcium silicate, aluminum silicate, silicic acid
- Metal silicate particles such as magnesium, metal oxide particles such as alumina, silica, zinc oxide and titanium oxide, metal hydroxide particles such as aluminum hydroxide, calcium hydroxide and magnesium hydroxide, barium sulfate and calcium sulfate Examples thereof include metal sulfate particles and carbon particles such as carbon black.
- mica is mentioned as a plate-shaped filler.
- talc calcium carbonate, or silica is preferably used.
- Carbon black or titanium oxide may be used.
- the dispersion state of the filler in a molded article such as a film or the resin composition is 0.08 to 25 ⁇ m, more preferably 0.1 to 5 ⁇ m in terms of number average particle diameter. When it deviates from this range, the addition effect of the said filler will become low.
- a filler may be used individually by 1 type and may be used in mixture of 2 or more types. These fillers are generally used in the range of 0.05 to 40% by weight in the resin composition.
- the surface-treated filler may be used.
- the filler is improved in dispersibility, the fluidity of the resin composition is improved, and the smoothness and opening of the film are improved. Can be improved.
- additives such as a plasticizer to be blended in the resin composition are reduced by surface treatment.
- a surface treatment method for the filler it is common to mix the surface treatment agent and the filler by a generally known method, but the method is not limited to the treatment method.
- the surface treatment agent include straight chain fatty acids having 6 to 40 carbon atoms, branched chain fatty acids, and ester compounds thereof.
- the particle size of the filler to be used is not particularly limited, but the average particle size is preferably 0.5 ⁇ m or more, more preferably 0.6 ⁇ m or more, and still more preferably 0.8 ⁇ m or more for reasons of improving film properties and handling. 7 ⁇ m or more. Moreover, it is preferable that an average particle diameter is 7 micrometers or less for the reason of a film physical property improvement, More preferably, it is 2 micrometers or less, More preferably, it is 1.0 micrometer or less.
- the measurement method of the average particle diameter is not particularly limited, but specific examples of the measurement method include obtaining a specific surface area value per gram of powder measured with a powder specific surface area measuring device SS-100 type (constant pressure air permeation method) manufactured by Shimadzu Corporation. From the measurement result of the specific surface area by the air permeation method according to JIS M-8511, the average particle diameter of the filler is calculated by the following formula.
- the aspect ratio when the needle filler is used usually has an upper limit of 1000 or less and a lower limit of 1 or more, preferably an upper limit of 500 or less and a lower limit of 10 or more. Most preferably, the upper limit is 100 or less and the lower limit is 15 or more. If this ratio is too low, the expected physical properties such as rigidity and heat resistance tend not to be expressed, and if it is too high, there is a tendency for poor appearance and a decrease in film physical properties.
- the aspect ratio here is the ratio of the major axis to the minor axis of the filler.
- the aspect ratio of the particles is the arithmetic average value of the ratio of the longest diameter to the shortest diameter of at least 10 particles observed in an electron micrograph having a field of view of 100 ⁇ m ⁇ 100 ⁇ m.
- the measuring method of the volume average particle diameter is not particularly limited, but the particles dispersed in the dispersion medium can be measured by a sedimentation method, measured by a laser scattering analysis, or measured by a laser Doppler method. More specifically, it is a value measured based on the sedimentation rate (Stokes's law) of particles using a centrifugal sedimentation type particle size distribution analyzer SA-CP4L manufactured by Shimadzu Corporation and an automatic particle size distribution measuring apparatus RS-1000 manufactured by Shimadzu Corporation. .
- the hardness of the filler there is no particular limitation on the hardness of the filler to be used, but if the hardness is too low, physical properties such as rigidity and heat resistance tend to be low, and if it is too high, it tends to cause poor appearance and reduced physical properties of the film strength. Therefore, it is preferable that the hardness is not too high or too low.
- the upper limit of the hardness (Mohs hardness) of the filler used is preferably 9 or less, and the lower limit is 1 or more, more preferably the upper limit is 8 or less, and the lower limit is 2 or more, and the upper limit is particularly preferably 7 or less. Is 3 or more.
- the Mohs hardness here refers to a value obtained by rubbing a standard substance with a sample substance and measuring the hardness with or without scratches.
- the standard substances are as follows. Hardness 1) talc, hardness 2) gypsum, hardness 3) calcite, hardness 4) fluorite, hardness 5) apatite, hardness 6) feldspar, hardness 7) crystal, hardness 8) yellow jade, hardness 9) corundum (steel ball) ), Hardness 10) diamond.
- talc, calcium carbonate, silica, titanium oxide, barium sulfate or the like can be used as the filler.
- talc calcium carbonate
- silica titanium oxide
- barium sulfate or the like can be used as the filler.
- talc calcium carbonate
- examples of calcium carbonate include NITREX30P, NITREX23P, NS # 100, NCC series NITREX30PS, NCC # 2310, NCC # 1010, NCC-V2300, NCC-V1000 manufactured by Nitto Flour, and Whiscal A manufactured by Maruo Calcium.
- silica particles include Nippon Aerosil Co., Ltd., Aerosil 200, Aerosil 300, and the like.
- titanium oxide CR-60, CR-80, CR-68 manufactured by Ishihara Sangyo Co., Ltd. can be used.
- Plasticizer If the flowability of the resin composition is poor, a plasticizer may be added. In particular, when a filler is included in the resin composition, the viscosity of the resin composition may increase and the flowability of the resin composition may deteriorate, and this is improved by adding a plasticizer to the resin composition. be able to.
- a known plasticizer can be used without any particular limitation.
- Antistatic agent when an antistatic agent is included in the resin composition according to the present invention, it is possible to improve moldability when the resin composition is formed into a bag after being formed into a film. In addition, handling of the film and the resin becomes easy. Any antistatic agent can be used as long as the effects of the present invention are not significantly impaired. As a specific example, a surfactant type nonionic, cationic or anionic type is preferable.
- Nonionic antistatic agents include glycerin fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, alkyldiethanolamine, hydroxyalkyl monoethanolamine, polyoxyethylene alkylamine, polyoxyethylene alkylamine fatty acid ester alkyldiethanol Amides and the like are listed. Of these, alkyldiethanolamines are preferred.
- Examples of cationic antistatic agents include tetraalkylammonium salts and trialkylbenzylammonium salts.
- Examples of the anionic antistatic agent include alkyl sulfonates, alkyl benzene sulfonates, and alkyl phosphates. Of these, alkylbenzene sulfonate is preferable. This is because the kneadability with the resin is good and the antistatic effect is high.
- the amount of the antistatic agent used is arbitrary as long as the effect of the present invention is not significantly impaired, but is usually 0.5% by weight or more, preferably 1% by weight or more, and usually 5% by weight with respect to the biodegradable resin composition. % By weight or less, preferably 3% by weight or less. If it exceeds the above range, the biodegradable resin composition will have surface stickiness and the product value tends to be reduced. On the other hand, if it is below the above range, the effect of improving antistatic properties tends to be reduced.
- starch examples include corn starch, waxy corn starch, high amylose corn starch, wheat starch, rice starch, potato starch, sweet potato starch, tapioca starch, and pea starch. These are unmodified and modified products. Either can be used. Modification includes all modification methods such as chemical, physical, and biological, and chemical modification includes esterification, etherification, oxidation, reduction, or partial or all of the structural units of carbohydrates (polysaccharides). It shows that it is modified by a chemical reaction such as coupling, dehydration, hydrolysis, dehydrogenation, halogenation, etc., and particularly shows that a hydroxyl group is etherified or esterified.
- Physical modification means changing physical properties such as changing the crystallinity.
- Biological degeneration refers to changing a chemical structure or the like using a living organism.
- Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-1 (octyloxy) -4-piperidinyl) ester decanoate, a reaction product of 1,1-dimethylethyl hydroperoxide and octane, bis ( 1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butyl malonate, bis (1,2,2 , 6,6-pentamethyl-4-piperidyl) sebacate, methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di-tert-butyl) Ru-4-
- the amount of the light-resistant agent to be mixed is usually 100 ppm or more, preferably 200 ppm or more, and usually 5 parts by weight or less, preferably 1 part by weight or less, more preferably, on a weight basis with respect to the biodegradable resin composition. 0.5 parts by weight or less. Below this range, the effect of the light resisting agent tends to be small. Moreover, when it exceeds this range, the manufacturing cost tends to be high, the heat resistance of the biodegradable resin composition tends to be inferior, and the light-proofing agent tends to bleed out.
- ultraviolet absorbers examples include 2- (2H-benzotriazol-2-yl) -4-6-bis (1-methyl-1-phenylethyl) phenol, 2- (4,6-diphenyl-1,3,5 -Triazin-2-yl) -5-[(hexyl) oxy] phenol and the like.
- the ultraviolet absorber it is particularly preferable to use two or more different types of ultraviolet absorbers in combination.
- the amount of the ultraviolet absorber to be mixed is arbitrary as long as the effects of the present invention are not significantly impaired.
- the biodegradable resin composition is usually 100 ppm or more, preferably 200 ppm or more, and usually 5 wt. % Or less, preferably 2% by weight or less, more preferably 0.5% by weight or less. Below this range, the effect of the ultraviolet absorber tends to decrease. Moreover, when it exceeds this range, the manufacturing cost tends to be too high, the heat resistance of the biodegradable resin composition is inferior, or the ultraviolet absorber bleeds out.
- heat stabilizer examples include dibutylhydroxytoluene (BHT; 2,6-di-t-butyl-4-methylphenol), 2,2′-methylenebis (4-methyl-6-t-butylphenol), pentaerythritol tetrakis [ 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 3,3 ′, 3 ′′, 5,5 ′, 5 ′′ -hexa-tert-butyl-a, a ′, a ′′ -(Mesitylene-2,4,6-triyl) tri-p-cresol, octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-tris [(4 -Tert-butyl-3-hydroxy-2,6-xylyl) methyl] -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -
- the amount of the heat stabilizer to be mixed is usually 100 ppm or more, preferably 200 ppm or more, and usually 5 parts by weight or less, preferably 1 part by weight or less, more preferably on a weight basis with respect to the biodegradable resin composition. Is 0.5 parts by weight or less. Below this range, the effect of the heat stabilizer tends to be small. On the other hand, if it exceeds this range, the manufacturing cost tends to be high, and the bleedout of the thermal stabilizer may occur.
- End-capping agents used mainly for the purpose of suppressing hydrolysis due to moisture in the atmosphere include carbodiimide compounds, epoxy compounds, oxazoline compounds, etc.
- carbodiimide compounds as monocarbodiimide compounds, Examples include dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, t-butylisopropylcarbodiimide, diphenylcarbodiimide, di-t-butylcarbodiimide, di- ⁇ -naphthylcarbodiimide, and the like.
- dicyclohexylcarbodiimide and diisopropylcarbodiimide are preferred because they are easily available industrially.
- polycarbodiimide compounds for example, US Pat. No. 2,941,956, Japanese Patent Publication No. 47-33279, J. Pat. Org. Chem. 28, p2069-2075 (1963), and Chemical Review 1981, 81, No. 4, p. What was manufactured by the method described in 619-621 etc. can be used.
- organic diisocyanates that are raw materials for producing polycarbodiimide compounds include aromatic diisocyanates, aliphatic diisocyanates, alicyclic diisocyanates, and mixtures thereof. Specifically, 1,5-naphthalene diisocyanate, 4, 4'-diphenylmethane diisocyanate, 4,4'-diphenyldimethylmethane diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,4- A mixture of tolylene diisocyanate and 2,6-tolylene diisocyanate, hexamethylene diisocyanate, cyclohexane-1,4-diisocyanate, xylylene diisocyanate, isophorone diisocyanate And dicyclohexylmethane-4,4′-diisocyanate,
- Examples of the carbodiimidization catalyst used in the decarboxylation condensation reaction of organic diisocyanate include organophosphorus compounds and organometallic compounds represented by the general formula M (OR) n (where M is titanium, sodium, potassium, vanadium, tungsten, hafnium).
- a metal atom such as zirconium, lead, manganese, nickel, calcium or barium, R represents an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, and n can be a metal atom M. Is preferred).
- phospholene oxides are preferable for organic phosphorus compounds, and alcosides of titanium, hafnium, or zirconium are preferable for organometallic compounds.
- phospholene oxides include 3-methyl-1-phenyl-2-phospholene-1-oxide, 3-methyl-1-ethyl-2-phospholene-1-oxide, and 1,3-dimethyl-2.
- -Phospholene-1-oxide, 1-phenyl-2-phospholene-1-oxide, 1-ethyl-2-phospholene-1-oxide, 1-methyl-2-phospholene-1-oxide and their double bond isomers Can be illustrated.
- 3-methyl-1-phenyl-2-phospholene-1-oxide which is easily available industrially, is particularly preferred.
- a desired degree of polymerization can be controlled by using an active hydrogen-containing compound capable of reacting with monoisocyanate or other terminal isocyanate groups.
- Compounds used for such purposes include monoisocyanate compounds such as phenyl isocyanate, tolyl isocyanate, dimethylphenyl isocyanate, cyclohexyl isocyanate, butyl isocyanate and naphthyl isocyanate, methanol, ethanol, phenol, cyclohexanol, N-methylethanolamine, Hydroxyl group-containing compounds such as polyethylene glycol monomethyl ether and polypropylene glycol monomethyl ether, amino group-containing compounds such as diethylamine, dicyclohexylamine, ⁇ -naphthylamine and cyclohexylamine, carboxyl group-containing compounds such as succinic acid, benzoic acid and cyclohexane acid, ethyl
- carbodiimide compounds may be used alone or in combination of two or more.
- it is particularly preferable to use a polycarbodiimide compound and the degree of polymerization of the lower limit is 2 or more, preferably 4 or more, and the upper limit is usually 40 or less, preferably 20 or less.
- the amount of carbodiimide used is usually 0.1 to 5% by weight based on the entire resin composition.
- the resin composition according to the present invention comprises the polyester resin (A), the polyester resin (B), and the polyester resin (C), and is derived from succinic acid in the polyester resin (A). It is characterized in that the amount of the structural unit is within a predetermined range and the blending ratio of the resins (A) to (C) is within a predetermined range.
- the tear strength of the film is improved and the impact strength is excellent.
- the resin composition according to the present invention it is possible to obtain a bag that is less likely to tear due to tearing and less likely to tear due to impact.
- a known method can be applied as a production method of the resin composition according to the present invention.
- blended polyester resin (A), polyester resin (B) and polyester resin (C) raw material chips are melt-mixed in the same extruder, each is melted in a separate extruder and then mixed.
- the extruder a single screw or a twin screw extruder can be used.
- the polyester resins (A) to (C) are mixed and heated and melted, other components can be added and blended.
- blending oil or the like can be used for the purpose of uniformly dispersing other components.
- each raw material chip relating to the polyester resins (A) to (C) can be directly supplied to a molding machine to prepare a resin composition, and at the same time, a molded body such as a film can be obtained as it is.
- the resin composition according to the present invention can be formed into a film by various molding methods applied to general-purpose plastics.
- the effects of the present invention are particularly prominent when molded by extrusion molding or inflation molding. More specifically, for example, a method of cooling and solidifying a film, sheet or cylinder extruded to a predetermined thickness from a T die, I die or round die with a cooling roll, water, compressed air, etc. Is mentioned. Under the present circumstances, it is also possible to set it as the laminated
- the film-like molded body thus obtained may then be uniaxially or biaxially stretched by a roll method, a tenter method, a tubular method or the like.
- the stretching temperature is usually in the range of 30 ° C. to 110 ° C.
- the stretching ratio is in the range of 0.6 to 10 times in the longitudinal and lateral directions.
- heat treatment may be performed by a method of blowing hot air, a method of irradiating infrared rays, a method of irradiating microwaves, a method of contacting on a heat roll, or the like.
- Multi film It is still more preferable when the resin composition according to the present invention is molded into a multi film for agriculture or the like. A known method as described above may be used for forming the multifilm.
- the multifilm obtained by molding the resin composition according to the present invention has the following effects. In the case of a multi-film, it can be said that a film excellent in tear strength is preferably used. In this respect, the multi-film obtained by molding the resin composition according to the present invention has improved tear strength and excellent impact strength. Therefore, in the laid multi film, it can suppress that a film tears and a defect part becomes large, and can also prevent that a multi film is torn by an impact.
- the resin composition according to the present invention has components such as aliphatic polyester, aromatic aliphatic copolymer polyester, and aliphatic oxycarboxylic acid as main components, it is problematic even if it is embedded in the soil as it is after using a multi-film. There is no.
- Bag The film obtained as described above may be formed into a bag.
- a known method can be applied for forming the bag.
- it can be molded by heat-sealing the end of a blown tubular body.
- the film constituting the bag has an improved impact strength and an improved impact strength. If the film is excellent in tear strength, it becomes possible to prevent the bag from tearing. In addition, since the impact strength is excellent, it is possible to prevent the bag from tearing when the bag is opened or when an object is packed in the bag.
- the melting point was measured by using a differential scanning calorimeter manufactured by Perkin Elmer Co., Ltd., product name: DSC7, and 10 mg sample was heated and melted in a nitrogen stream at a flow rate of 50 mL / min, and then 10 ° C / min. After cooling at a rate of 1, the melting peak temperature at the time of heating at a rate of 10 ° C./min was used.
- This mixed solution was transferred to an eggplant-shaped flask and concentrated under reduced pressure by an evaporator in an oil bath at 60 ° C. After 1 hour, most of the ethanol was distilled off, leaving a translucent viscous liquid. The temperature of the oil bath was further increased to 80 ° C., and further concentration was performed under a reduced pressure of 5 Torr. The viscous liquid gradually changed from the surface to a powder form, and was completely powdered after 2 hours. Furthermore, a powdery catalyst was dissolved in 1,4-butanediol to prepare a titanium atom having a concentration of 10,000 ppm.
- polyester resin was obtained.
- this polyester resin may be referred to as “resin 1”.
- the obtained polyester resin had a melting point of 114 ° C., an MFR value of 4.4 g / 10 min, and the succinic acid unit in the dicarboxylic acid unit constituting the aliphatic polyester resin was 100 mol%.
- polyester resin 2 this polyester resin may be referred to as “resin 2”.
- the obtained polyester resin had a melting point of 88 ° C., an MFR value of 4.2 g / 10 min, and a succinic acid unit in the dicarboxylic acid unit constituting the polyester resin was 79 mol%.
- Production Example 3 In Production Example 1, polymerization was carried out in the same manner as in Production Example 1 except that 100 parts by weight of succinic acid, 31.0 parts by weight of adipic acid, 143 parts by weight of 1,4-butanediol, and 0.345 parts by weight of malic acid were obtained. A polyester resin was obtained. Hereinafter, this polyester resin may be referred to as “resin 3”. The obtained polyester resin had a melting point of 91 ° C., an MFR value of 3.7 g / 10 min, and a succinic acid unit in the dicarboxylic acid unit constituting the polyester resin was 80 mol%.
- Production Example 4 In Production Example 1, polymerization was performed in the same manner as in Production Example 1, except that 100 parts by weight of succinic acid, 43.6 parts by weight of adipic acid, 155 parts by weight of 1,4-butanediol, and 0.382 parts by weight of malic acid were obtained. A polyester resin was obtained. Hereinafter, this polyester resin may be referred to as “resin 4”.
- the obtained polyester resin (resin 4) had a melting point of 83.8 ° C., an MFR value of 3.2 g / 10 min, and a succinic acid unit in the dicarboxylic acid unit constituting the polyester resin was 74 mol%. .
- Production Example 5 In the same manner as in Production Example 2, 100 parts by weight of succinic acid, 44.6 parts by weight of sebacic acid, 112 parts by weight of 1,4-butanediol, 0.472 parts by weight of malic acid, and 1% by weight of germanium oxide were dissolved in advance. 7.0 parts by weight of 90% DL lactic acid aqueous solution was charged. While stirring the contents of the vessel, nitrogen gas was introduced, the reaction was started from 160 ° C. under a nitrogen gas atmosphere, the temperature was raised to 220 ° C. over 1 hour, and held for 1 hour. Thereafter, the temperature was raised to 230 ° C.
- polyester resin this polyester resin may be referred to as “resin 5”.
- the obtained polyester resin (resin 5) had a melting point of 87.8 ° C., and the succinic acid units in the dicarboxylic acid units constituting the polyester resin were 79 mol%.
- Filler 3 Calcium carbonate NITREX23PS (Nitto Flour Chemical Co., Ltd. average particle size: 0.96 ⁇ m, specific gravity: 2.7, specific surface area: 23000 cm 2 / g, fatty acid treatment)
- Filler 4 Calcium carbonate NCC # 1010 (Nitto Flour Chemical Industries average particle size: 1.2 ⁇ m, specific gravity: 2.7, specific surface area: 19000 cm 2 / g, untreated)
- Filler 5 calcium carbonate NS # 100 (manufactured by Nitto Flour Industry Co., Ltd. average particle size: 2.1 ⁇ m, specific gravity: 2.7, specific surface area: 10500 cm 2 / g, untreated)
- the films according to Examples 1 to 9 were obtained from the polyester resin (A), the amount of structural units derived from succinic acid, the polyester resin (A), the polyester resin (B), and the polyester resin.
- the composition ratio of (C) is within the range specified in the present invention, it has a tear strength of 10 N / mm or more and 3.6 ⁇ 10 4 [J / m] or more. It can be seen that it has excellent impact strength and mechanical strength.
- the tear strengths of the films according to Comparative Examples 1 to 9 are all below 11 N / mm.
- the films according to Examples 10 to 23 were obtained from the polyester resin (A), the amount of structural units derived from succinic acid, the polyester resin (A), the polyester resin (B), and the polyester resin.
- the composition ratio of (C) is within the range specified in the present invention, and the composition to which the filler is added has a tear strength of 20 N / mm or more and 1.1 ⁇ 10 It has an impact strength of 4 [J / m] or more, and also has good moldability, openability and surface appearance, and is excellent in mechanical strength and moldability.
- the resin composition according to the present invention comprises a polyester resin (A), a polyester resin (B), and a polyester resin (C), and the amount of structural units derived from succinic acid in the polyester resin (A). Is within the predetermined range, and the blending ratio of the resins (A) to (C) is within the predetermined range.
- the tear strength of the film is improved and the impact strength is excellent.
- the resin composition according to the present invention it is possible to obtain a bag that is less likely to tear due to tearing and less likely to tear due to impact.
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Abstract
Description
また、芳香族脂肪族共重合ポリエステル系樹脂を用いてフィルムを成形した場合、柔軟性は十分となるものの、引張強度が弱く、いわゆる腰のないフィルムとなってしまう場合があり、特許文献2に記載の技術を利用した場合でも、フィルムの引き裂き強度に劣る場合があり、また、衝撃強度についても改善の余地があった。
[1]
脂肪族ジオール単位と脂肪族ジカルボン酸単位とを含む脂肪族ポリエステル系樹脂であって、全脂肪族ジカルボン酸単位中、コハク酸単位を5モル%以上86モル%以下含有するポリエステル樹脂(A)、
脂肪族ジオール単位、脂肪族ジカルボン酸単位、および芳香族ジカルボン酸単位を含む芳香族脂肪族共重合ポリエステル系樹脂であって、全ジカルボン酸単位中、芳香族ジカルボン酸単位を5モル%以上95モル%以下含有するポリエステル樹脂(B)、および
脂肪族オキシカルボン酸を含むポリエステル樹脂(C)を含有するポリエステル樹脂組成物であって、
ポリエステル樹脂(A)およびポリエステル樹脂(B)の合計に対して、ポリエステル樹脂(A)を10~89重量%、ポリエステル樹脂(B)を11~90重量%含有し、且つ、
ポリエステル樹脂(A)、ポリエステル樹脂(B)およびポリエステル樹脂(C)の合計に対してポリエステル樹脂(C)を1~40重量%含有する、ポリエステル樹脂組成物。
[2]
ポリエステル樹脂(A)を構成する脂肪族ジカルボン酸単位が、炭素数2以上40以下の脂肪族ジカルボン酸単位を含有する、上記[1]に記載の樹脂組成物。
[3]
さらに滑材を含有する、上記[1]または[2]に記載の樹脂組成物。
[4]
さらにフィラーを含有する、上記[1]から[3]のいずれか1つに記載の樹脂組成物。
[5]
上記[1]から[4]のいずれか1つに記載の樹脂組成物を成形して得られるフィルム。
[6]
上記[1]から[4]のいずれか1つに記載の樹脂組成物を成形して得られるマルチフィルム。
[7]
上記[5]に記載のフィルムを成形して得られる袋。
本発明の樹脂組成物は、ポリエステル樹脂(A)、ポリエステル樹脂(B)およびポリエステル樹脂(C)を特定量含有する事を特徴とする樹脂組成物であって、ポリエステル樹脂(A)およびポリエステル樹脂(B)の合計に対して、ポリエステル樹脂(A)を10~89重量%、ポリエステル樹脂(B)を11~90重量%含有し、且つ、ポリエステル樹脂(A)、ポリエステル樹脂(B)およびポリエステル樹脂(C)の合計に対してポリエステル樹脂(C)を1~40重量%含有する、ポリエステル樹脂組成物である。
本発明に用いられるポリエステル樹脂(A)は脂肪族ジオール単位、脂肪族ジカルボン酸単位とを含む脂肪族ポリエステル系樹脂であって、全脂肪族ジカルボン酸由来単位中、コハク酸由来単位を5モル%以上86モル%以下含有する。ポリエステル樹脂(A)は、コハク酸単位の量が異なるポリエステル樹脂の混合物であってもよく、例えば、コハク酸由来以外のジカルボン酸構造単位を含まない脂肪族ポリエステル系樹脂と、コハク酸由来以外の構造単位を含む脂肪族ポリエステル系樹脂とをブレンドして、ポリエステル樹脂(A)におけるコハク酸由来の構造単位量を上記所定範囲内に調整して使用する事も可能である。
-O-R1-O- (1)
-OC-R2-CO- (2)
式(1)中、R1は、2価の脂肪族炭化水素基を表す。ポリエステル樹脂(A)が共重合体である場合には、ポリエステル樹脂(A)中に2種以上の式(1)で表される脂肪族ジオール単位が含まれていてもよい。上記式(2)中、R2は、2価の脂肪族炭化水素基を表す。上記式(1)、(2)で表される脂肪族ジオール単位、脂肪族ジカルボン酸単位は、石油から誘導された化合物由来であっても、植物原料から誘導された化合物由来であってもかまわないが、植物原料から誘導された化合物を含む事が望ましい。ポリエステル樹脂(A)が共重合体である場合には、ポリエステル樹脂(A)中に2種以上の式(2)で表される脂肪族ジカルボン酸単位が含まれていてもよい。そして、式(2)で表される脂肪族ジカルボン酸単位には、コハク酸に由来する構造単位が、全脂肪族ジカルボン酸単位に対して5モル%以上86モル%以下含まれている。ポリエステル樹脂(A)におけるコハク酸由来の構造単位量を所定範囲内とすることで、引き裂き強度が向上されるとともに衝撃強度にも優れたフィルムを得ることが可能となる。そして同様の理由から、コハク酸に由来する構造単位は、全脂肪族ジカルボン酸単位に対して好ましくは10モル%以上、より好ましくは50モル%以上、更に好ましくは64モル%以上、特に好ましくは68モル%以上であり、好ましくは83モル%以下、より好ましくは81モル%以下、特に好ましくは79モル%以下含まれている。
本発明に用いられるポリエステル樹脂(B)は、脂肪族ジオール単位、脂肪族ジカルボン酸単位、および芳香族ジカルボン酸単位を含む芳香族脂肪族共重合ポリエステル系樹脂である。具体的には、例えば、下記式(3)で表される脂肪族ジオ-ル単位、下記式(4)で表される脂肪族ジカルボン酸単位、および、下記式(5)で表される芳香族ジカルボン酸単位からなる芳香族脂肪族共重合ポリエステルを主成分とするものが好ましく、生分解性を有することが好ましい。
式(3)中、R3は2価の脂肪族炭化水素基を表す。ポリエステル樹脂(B)が共重合体である場合には、ポリエステル樹脂(B)中に2種以上のR3が含まれていてもよい。
式(4)中、R4は2価の脂肪族炭化水素基を表す。ポリエステル樹脂(B)が共重合体である場合には、ポリエステル樹脂(B)中に2種以上のR4が含まれていてもよい。
式(5)中、R5は2価の芳香族炭化水素基を示す。ポリエステル樹脂(B)が共重合体である場合には、ポリエステル樹脂(B)中に2種以上のR5が含まれていてもよい。
本発明に用いられるポリエステル樹脂(C)は、脂肪族オキシカルボン酸単位からなるポリエステル樹脂を主成分とする。
本発明に係る樹脂組成物には、滑剤、フィラー(充填剤)、可塑剤、帯電防止剤、酸化防止剤、光安定剤、紫外線吸収剤、染料、顔料、加水分解防止剤等の各種添加剤や、ポリカプロラクトン、ポリアミド、ポリビニルアルコール、セルロースエステル等の合成樹脂や、澱粉、セルロース、紙、木粉、キチン・キトサン質、椰子殻粉末、クルミ殻粉末等の動物/植物物質微粉末、或いはこれらの混合物が「その他の成分」として含まれていてもよい。これらは、本発明の効果を損なわない範囲で任意に使用できる。これらは1種を単独で用いてもよく、2種以上を混合して使用してもよい。これら添加剤の添加量は、通常、生分解性樹脂組成物の物性を損なわないために、混合する物質の総量が、生分解性樹脂組成物の総量に対して、0.01重量%以上40重量%以下であることが好ましい。
例えば、本発明に係る樹脂組成物に滑剤を含ませると、樹脂組成物をフィルムとしたのち袋に成形する際の成形性を向上させることができる。また、袋の口を開き易くすることができ、袋の使用性を向上させることができる。さらに、袋の口が開き易くなると、袋製造時の検査も容易となる。
本発明に係る樹脂組成物にフィラーを含ませると、樹脂組成物の流動性と結晶化速度の改良によるフィルム成形時の安定化、フィルム機械物性の異方向性の低減にも寄与させることができる。また、樹脂組成物をフィルムとした場合にフィルム同士のブロッキングを防止することができる。或いは、フィルムを袋に成形した場合に袋の口を開き易くすることもできる。さらに、フィルムや袋を着色し、遮光性や光反射性を向上させることもできる。
用いるフィラーの粒径に特に制限は無いが、フィルム物性向上、ハンドリングの理由から平均粒子径が0.5μm以上であることが好ましく、より好ましくは0.6μm以上であって、更に好ましくは0.7μm以上である。また、フィルム物性向上の理由から平均粒子径が7μm以下であることが好ましく、より好ましくは2μm以下であって、更に好ましくは1.0μm以下である。平均粒子径の測定方法は特に限定されないが、測定法の具体例は島津製作所製 粉体比表面積測定装置 SS-100型(恒圧式空気透過法) で測定した粉末1gあたりの比表面積値を求め、 JIS M-8511 に準じた空気透過法による比表面積の測定結果から、下記式によりフィラーの平均粒子径を計算する。
尚、樹脂組成物の流れ性が悪い場合は、可塑剤を加えるとよい。特に、樹脂組成物にフィラーを含ませた場合、樹脂組成物の粘度が上昇して樹脂組成物の流れ性が悪くなる場合があり、樹脂組成物に可塑剤を加えることによって、これを改善することができる。
また、本発明に係る樹脂組成物に帯電防止剤を含ませると、樹脂組成物をフィルムとした後に袋に成形する場合の成形性を向上させることができる。また、フィルムや樹脂の取り扱いも容易となる。帯電防止剤としては、本発明の効果を著しく損なわない限り任意のものを用いることができる。具体例としては、界面活性剤型のノニオン系、カチオン系、アニオン系が好ましい。
ノニオン系の帯電防止剤としては、グリセリン脂肪酸エステル、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル、アルキルジエタノールアミン、ヒドロキシアルキルモノエタノールアミン、ポリオキシエチレンアルキルアミン、ポリオキシエチレンアルキルアミン脂肪酸エステルアルキルジエタノールアマイド類等があげられる。中でもアルキルジエタノールアミン類等が好ましい。
澱粉としては、具体的にはコーンスターチ、ワキシーコーンスターチ、ハイアミロースコーンスターチ、小麦澱粉、米澱粉、馬鈴薯澱粉、甘藷澱粉、タピオカ澱粉、エンドウ澱粉等が挙げられ、これらは未変性品、変性品どちらも使用できる。変性とは化学的、物理的、生物学的等のあらゆる変性方法を含み、化学的変性としては、炭水化物(多糖類)の構成単位の一部または全部をエステル化、エーテル化、酸化、還元、カップリング、脱水、加水分解、脱水素、ハロゲン化等の化学反応により変性することを示し、特には、水酸基をエーテル化、エステル化することを示す。また、物理的変性は、結晶化度を変化させること等、物理的性質を変化させることを示す。また、生物学的変性は、生物を用いて化学構造等を変化させることを示す。
本発明に係る樹脂組成物の製造方法としては、公知の手法を適用することができる。例えば、ブレンドしたポリエステル樹脂(A)、ポリエステル樹脂(B)およびポリエステル樹脂(C)の原料チップを同一の押出機で溶融混合する方法、各々別々の押出機で溶融させた後に混合する方法等が挙げられる。押出機としては、単軸または2軸押出機が利用できる。また、ポリエステル樹脂(A)~(C)を混合して加熱溶融させたところに、その他成分を添加して配合することもできる。この際、その他成分を均一に分散させる目的で、ブレンド用オイル等を使用することもできる。一方、ポリエステル樹脂(A)~(C)に係る各々の原料チップを直接成形機に供給して、樹脂組成物を調製すると同時に、そのままフィルム等の成形体を得ることも可能である。
本発明に係る樹脂組成物は、汎用プラスチックに適用される各種成形法によりフィルム状に成形することができる。成形法に関しては、特に、押し出し成形やインフレーション成形によって成形すると、本発明の効果が顕著に現れる。より具体的には、例えば、Tダイ、Iダイまたは丸ダイ等から所定の厚みに押し出したフィルム状、シート状物または円筒状物を、冷却ロールや水、圧空等により冷却、固化させる方法等が挙げられる。この際、本発明の効果を阻害しない範囲で、数種の組成物を積層させた積層フィルムとすることも可能である。
本発明に係る樹脂組成物を成形して農業用等のマルチフィルムとすると尚好ましい。マルチフィルムの成形については、上記したような公知の方法を用いればよい。本発明に係る樹脂組成物を成形して得られたマルチフィルムは以下の効果を奏する。マルチフィルムにあっては、引き裂き強度に優れるものが好適に用いられると言える。この点、本発明に係る樹脂組成物を成形して得られるマルチフィルムは、引き裂き強度が向上されたものであり、且つ、衝撃強度にも優れている。よって、敷設したマルチフィルムにおいて、フィルムが裂けて欠陥部分が大きくなることを抑制することができ、また、衝撃によってマルチフィルムが裂けることも防止することができる。尚、本発明に係る樹脂組成物は、脂肪族ポリエステル、芳香族脂肪族共重合ポリエステル、脂肪族オキシカルボン酸といった成分を主成分としているため、マルチフィルムを使用後、そのまま土中に埋め込んでも問題がない。
上記のようにして得られるフィルムを成形して袋としてもよい。袋の成形については、公知の方法を適用することができる。例えば、インフレーション成形した筒状体の末端をヒートシールすることによって成形可能である。ここで、上述したように、袋を構成するフィルムは引き裂き強度が向上されるとともに優れた衝撃強度を有している。フィルムが引き裂き強度に優れると、袋の縦裂けを防止することが可能となる。また、衝撃強度に優れることで、袋を開ける際や袋に物を詰める際、袋の裂けを防止することが可能となる。
・MFR値の測定
MFR値は、JIS K7210(1990)に基づき、メルトインデクサーを用いて190℃、荷重2.16kgにて測定した。
・1H-NMRの測定
1H-NMRの測定では、試料約30mgを外径5mmのNMR試料管に量り取り、重クロロホルム0.75mLに加えて溶かした後に、Bruker社製AVANCE400分光計を用い、室温で1H-NMRスペクトルを測定した。化学シフトの基準は、テトラメチルシラン(TMS)を0.00ppmとした。
・融点の測定
融点の測定は、パーキンエルマー(株)製示差走査熱量計,製品名:DSC7を用い、10mgのサンプルを流量50mL/分の窒素気流下で加熱溶融させた後、10℃/分の速度で冷却後、引き続き10℃/分の速度で昇温する際の融解ピーク温度を使用した。
[重縮合用触媒の調製]
撹拌装置付きのガラス製ナス型フラスコに酢酸マグネシウム・4水和物を100重量部入れ、更に400重量部の無水エタノール(純度99重量%以上)を加えた。更にエチルアシッドホスフェート(モノエステル体とジエステル体の混合重量比は45:55)を65.3重量部加え、23℃で撹拌を行った。15分後に酢酸マグネシウムが完全に溶解したことを確認後、テトラ-n-ブチルチタネートを122.2重量部添加した。更に10分間撹拌を継続し、均一混合溶液を得た。この混合溶液を、ナス型フラスコに移し、60℃のオイルバス中でエバポレーターによって減圧下で濃縮を行った。1時間後に殆どのエタノールが留去され、半透明の粘稠な液体が残った。オイルバスの温度を更に80℃まで上昇させ、5Torrの減圧下で更に濃縮を行った。粘稠な液体は表面から粉体状へと徐々に変化し、2時間後には完全に粉体化した。更に、粉体状の触媒を1,4-ブタンジオールに溶解させ、チタン原子として10,000ppmとなるように調製した。
攪拌装置、窒素導入口、加熱装置、温度計および減圧用排気口を備えた反応容器に、原料としてコハク酸100重量部、1,4-ブタンジオール99.2重量部、リンゴ酸0.24重量部を仕込み、窒素-減圧置換によって系内を窒素雰囲気下にした。
次に、系内を撹拌しながら1時間かけて230℃まで昇温し、この温度で1時間反応させた。その後、前記の触媒溶液を添加した。添加量は得られるポリエステル樹脂あたりチタン原子として50ppmとなる量とした。30分かけて250℃まで昇温し、同時に1時間30分かけて0.06×103Paになるように減圧し、更に0.06×103Paの減圧下で4.2時間反応させポリエステル樹脂を得た。以下、このポリエステル樹脂を、樹脂1と呼ぶことがある。
得られたポリエステル樹脂の融点は114℃で、MFR値は4.4g/10分であり、脂肪族ポリエステル系樹脂を構成するジカルボン酸単位中のコハク酸単位は100モル%であった。
攪拌装置、窒素導入口、加熱装置、温度計および減圧用排気口を備えた反応容器に、原料としコハク酸100重量部、アジピン酸32.2重量部、1,4-ブタンジオール111重量部、DLリンゴ酸0.31重量部、酸化ゲルマニウムを予め1重量%溶解させた90%DL乳酸水溶液7.0重量部を仕込んだ。容器内容物を攪拌下、窒素ガスを導入し、窒素ガス雰囲気下120℃から反応を開始し、1時間40分かけて200℃まで昇温した。引き続き、1時間25分かけて230℃に昇温すると同時に1mmHg(133Pa)まで減圧し、230℃、1mmHg(133Pa)にて4時間重合を行い、ポリエステル樹脂を得た。以下、このポリエステル樹脂を、樹脂2と呼ぶことがある。
得られたポリエステル樹脂の融点は88℃で、MFR値は4.2g/10分、ポリエステル樹脂を構成するジカルボン酸単位中のコハク酸単位は79モル%であった。
製造例1において、コハク酸100重量部、アジピン酸31.0重量部、1,4-ブタンジオール143重量部、リンゴ酸0.345重量部とした以外は製造例1と同様に重合を行い、ポリエステル樹脂を得た。以下、このポリエステル樹脂を、樹脂3と呼ぶことがある。
得られたポリエステル樹脂の融点は91℃で、MFR値は3.7g/10分、ポリエステル樹脂を構成するジカルボン酸単位中のコハク酸単位は80モル%であった。
製造例1において、コハク酸100重量部、アジピン酸43.6重量部、1,4-ブタンジオール155重量部、リンゴ酸0.382重量部とした以外は製造例1と同様に重合を行い、ポリエステル樹脂を得た。以下、このポリエステル樹脂を、樹脂4と呼ぶことがある。
得られたポリエステル系樹脂(樹脂4)の融点は83.8℃であり、MFR値は3.2g/10分、ポリエステル樹脂を構成するジカルボン酸単位中のコハク酸単位は74モル%であった。
製造例2と同様にして、コハク酸100重量部、セバシン酸44.6重量部、1,4-ブタンジオール112重量部、リンゴ酸0.472重量部、酸化ゲルマニウムを予め1重量%溶解させた90%DL乳酸水溶液7.0重量部を仕込んだ。容器内容物を攪拌下、窒素ガスを導入し、窒素ガス雰囲気下160℃から反応を開始し、1時間かけて220℃まで昇温し、1時間保持した。その後、1時間25分かけて230℃に昇温すると同時に1mmHg(133Pa)まで減圧し、230℃、1mmHg(133Pa)にて4時間重合を行いポリエステル樹脂を得た。以下、このポリエステル樹脂を樹脂5と呼ぶことがある。得られたポリエステル樹脂(樹脂5)の融点は87.8℃であり、ポリエステル樹脂を構成するジカルボン酸単位中のコハク酸単位は79モル%であった。
製造例1~5で製造した、ポリエステル樹脂(A)に該当する各樹脂と、ポリエステル樹脂(B)に該当する芳香族脂肪族共重合ポリエステル系樹脂として以下に示すEcoflexを、ポリエステル樹脂(C)に該当する脂肪族オキシカルボン酸からなるポリエステル樹脂として以下に示すレイシアH-400、フィラー(D)として以下に示す炭酸カルシウムを用いて、下記表1、表2に記載された組成比となるように配合し、200℃において二軸混練機(池貝鉄鋼社製PCM30)にて混練し、175℃でインフレーション成形し、21μm厚みのフィルムを作成した。
・レイシアH-400(ポリ乳酸、三井化学社製)
・フィラー(D)
フィラー1:炭酸カルシウム NITREX 30P (日東粉化工業製 平均粒子径:0.76μm、比重:2.7、比表面積:30000cm2/g、無処理)
フィラー2:炭酸カルシウム NCC V2300 (日東粉化工業製 平均粒子径:0.96μm、比重:2.7、比表面積:23000cm2/g、脂肪酸処理と有機化合物処理)
フィラー3:炭酸カルシウム NITREX23PS (日東粉化工業製 平均粒子径:0.96μm、比重:2.7、比表面積:23000cm2/g、脂肪酸処理)
フィラー4:炭酸カルシウム NCC#1010 (日東粉化工業製 平均粒子径:1.2μm、比重:2.7、比表面積:19000cm2/g、無処理)
フィラー5:炭酸カルシウム NS#100 (日東粉化工業製 平均粒子径:2.1μm、比重:2.7、比表面積:10500cm2/g、無処理)
<エルメンドルフ引き裂き強度>
JIS K7128-2(1998)に準拠して、フィルム成形時のフィルム流れ方向の引き裂き強度を測定した。
東洋精機社製フィルムインパクトテスターを用い、直径50mmのフィルムの打ち抜き衝撃強度をJIS P8134(1998)に準じて測定した。尚、インパクトテスター打ち抜き部先端には直径25.4mmの半球状金属製治具を取り付けて評価を行った。
40mmの押出し機、直径60mmの丸ダイを有するインフレーション成型機にて、ブロー比2.5mm、厚み20ミクロンとし、吐出量8kg/h、エアブロー一定にて、成型性(バブル、フロストの状態)、フィルムの口開き性、表面外観を評価した。
〔成型性の評価基準〕
○:フロストラインが低く、成型性が良好
△:フロストラインは少し高いが、成型性に問題ない状態
×:バブルが安定しなく成型できない状態
〔口開き性の評価基準〕
○:抵抗なくフィルムが開く状態
△:少し抵抗はあるが開く状態
×:抵抗があり、開きにくい状態
〔表面外観の評価基準〕
○:表面状態が平滑で、極めて良好な状態
△:少し凹凸があるが、良好な状態
×:凹凸がひどく表面が荒れた状態
Claims (7)
- 脂肪族ジオール単位と脂肪族ジカルボン酸単位とを含む脂肪族ポリエステル系樹脂であって、全脂肪族ジカルボン酸単位中、コハク酸単位を5モル%以上86モル%以下含有するポリエステル樹脂(A)、
脂肪族ジオール単位、脂肪族ジカルボン酸単位、および芳香族ジカルボン酸単位を含む芳香族脂肪族共重合ポリエステル系樹脂であって、全ジカルボン酸単位中、芳香族ジカルボン酸単位を5モル%以上95モル%以下含有するポリエステル樹脂(B)、および
脂肪族オキシカルボン酸を含むポリエステル樹脂(C)を含有するポリエステル樹脂組成物であって、
ポリエステル樹脂(A)およびポリエステル樹脂(B)の合計に対して、ポリエステル樹脂(A)を10~89重量%、ポリエステル樹脂(B)を11~90重量%含有し、且つ、
ポリエステル樹脂(A)、ポリエステル樹脂(B)およびポリエステル樹脂(C)の合計に対してポリエステル樹脂(C)を1~40重量%含有する、ポリエステル樹脂組成物。 - ポリエステル樹脂(A)を構成する脂肪族ジカルボン酸単位が、炭素数2以上40以下の脂肪族ジカルボン酸単位を含有する、請求項1に記載の樹脂組成物。
- さらに滑材を含有する、請求項1または請求項2に記載の樹脂組成物。
- さらにフィラーを含有する、請求項1から請求項3のいずれか1項に記載の樹脂組成物。
- 請求項1から請求項4のいずれか1項に記載の樹脂組成物を成形して得られるフィルム。
- 請求項1から請求項4のいずれか1項に記載の樹脂組成物を成形して得られるマルチフィルム。
- 請求項5に記載のフィルムを成形して得られる袋。
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