WO2020166444A1 - ポリブチレンテレフタレート樹脂組成物 - Google Patents
ポリブチレンテレフタレート樹脂組成物 Download PDFInfo
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- WO2020166444A1 WO2020166444A1 PCT/JP2020/004322 JP2020004322W WO2020166444A1 WO 2020166444 A1 WO2020166444 A1 WO 2020166444A1 JP 2020004322 W JP2020004322 W JP 2020004322W WO 2020166444 A1 WO2020166444 A1 WO 2020166444A1
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- terephthalate resin
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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
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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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
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
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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
- C08K5/16—Nitrogen-containing compounds
- C08K5/32—Compounds containing nitrogen bound to oxygen
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0869—Acids or derivatives thereof
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
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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
- C08L67/025—Polyesters derived from dicarboxylic acids and dihydroxy compounds containing polyether sequences
Definitions
- the present invention relates to a polybutylene terephthalate resin composition. More specifically, the present invention provides a polybutylene terephthalate resin composition having excellent impact properties, high fluidity, excellent mold releasability during molding, and excellent melt stability, which is suitable for thin-wall molding.
- Polybutylene terephthalate resin has excellent mechanical properties, electrical properties, other physical and chemical properties, and good processability, so it is used as an engineering plastic in a wide range of applications such as automobiles, electric and electronic parts. ing. In particular, due to its excellent electrical characteristics, it has been expanding for applications such as home appliances, office automation equipment, and automobiles. The tendency of these products to be light, thin, short and small is remarkable, for example, the outer shell parts thereof are extremely thin. However, the polybutylene terephthalate resin has a poor Charpy impact property and has a defect that it breaks particularly easily in a thin molded product. In addition, a material having higher fluidity than before is required.
- a polybutylene terephthalate resin composition having excellent Charpy impact properties is strongly desired.
- a method of improving the Charpy impact property of the polybutylene terephthalate resin a method of adding rubber is generally known.
- Patent Document 1 compatibility and impact resistance are improved by adding a core-shell rubber having a glycidyl group to a polybutylene terephthalate resin.
- Patent Document 2 shows that resin modification is possible while maintaining a comparative tracking index by adding an ethylene-alkyl acrylate-glycidyl methacrylate copolymer to a polybutylene terephthalate resin.
- the fluidity is lowered due to the reaction between the polybutylene terephthalate resin and the glycidyl group.
- Patent Document 3 by adding a rubber and a core-shell elastomer to a polybutylene terephthalate resin, impact resistance is improved, low warpage and weld strength are improved. However, in order to improve impact resistance, it is necessary to add a large amount of rubber and core shell elastomer, and it is considered that the fluidity is lowered.
- Patent Document 4 a polybutylene terephthalate resin is used in combination with a core-shell polymer and glass fiber to improve impact resistance and rigidity. However, it is expected that the combined use of glass fibers will increase the flow resistance and significantly reduce the flowability.
- Patent Document 5 an attempt has been made to achieve both impact properties and high fluidity by blending a polybutylene terephthalate resin with an elastomer having a glycidyl group and/or a carboxylic acid derivative terminal and a chain polyester oligomer.
- the chain polyester oligomer is easily gasified, there have been fundamental problems such as the cause of mold stains during injection molding and contamination of the inside of the product.
- the present invention is intended to solve the above problems, and an object thereof is to provide a polybutylene terephthalate resin composition having excellent impact properties and high fluidity.
- the present inventors have completed the present invention as a result of diligently studying the constitution and characteristics of a polybutylene terephthalate resin composition in order to solve the above problems.
- the present invention has the following configurations.
- a flow length (measurement condition: cylinder temperature 250° C., mold temperature 50° C., injection pressure 80 MPa) obtained by injection molding the polybutylene terephthalate resin composition is 150 mm or more.
- the polybutylene terephthalate resin composition further contains 0.05 to 1.5 parts by mass of a carbodiimide compound (D) based on 100 parts by mass of the components (A), (B) and (C).
- the modified olefin resin (B) is an ethylene copolymer obtained by copolymerizing maleic anhydride and/or glycidyl methacrylate in a total amount of 0.01 to 15% by mass.
- the polybutylene terephthalate resin composition according to any one of claims.
- the content (blending amount) of each component in the polybutylene terephthalate resin composition of the present invention is a polybutylene terephthalate resin (A), a modified olefin resin (B), and a polyester elastomer (C). Is expressed as an amount when the total of 100 parts by mass is 100 parts by mass.
- the blending amount of each component is the content as it is in the polybutylene terephthalate resin composition.
- the polybutylene terephthalate resin (A) is obtained by polycondensing a dicarboxylic acid containing terephthalic acid or its ester-forming derivative as a main component with a diol containing 1,4-butanediol or its ester-forming derivative as a main component. It is a polymer that can be obtained by a general polymerization method such as.
- the repeating unit of butylene terephthalate is preferably 80 mol% or more, more preferably 90 mol% or more, further preferably 95 mol% or more, and 100 mol%. Is particularly preferable.
- the polybutylene terephthalate resin (A) may contain other polymerization components in a range that does not impair the properties thereof, for example, about 20 mol% or less.
- polybutylene terephthalate resins containing other polymerization components include polybutylene (terephthalate/isophthalate), polybutylene (terephthalate/adipate), polybutylene (terephthalate/sebacate), polybutylene (terephthalate/decanedicarboxylate), polybutylene (terephthalate). /Naphthalate), poly(butylene/ethylene)terephthalate, and the like. These components may be used alone or in combination of two or more.
- the intrinsic viscosity (IV) of the polybutylene terephthalate resin (A) needs to be 0.60 to 0.95 dl/g. When the intrinsic viscosity (IV) is in this range, the fluidity, mechanical properties and chemical properties are good.
- the intrinsic viscosity (IV) of the polybutylene terephthalate resin (A) is preferably 0.65 to 0.90 dl/g, more preferably 0.68 to 0.88 dl/g, and 0.70 to More preferably, it is 0.85 dl/g. If the intrinsic viscosity (IV) is less than 0.60 dl/g, the mechanical strength and impact properties may deteriorate. If the intrinsic viscosity (IV) is more than 0.95 dl/g, sufficient fluidity cannot be obtained, and thin-wall molding tends to be difficult.
- the amount of terminal carboxyl groups of the polybutylene terephthalate resin (A) is not particularly limited.
- the hydrogen ion dissociated from the terminal carboxyl group plays a catalytic role in the hydrolysis reaction of the polyester, so that the hydrolysis reaction is accelerated as the amount of the terminal carboxyl group increases. From this viewpoint, it is preferable that the amount of terminal carboxyl groups is small.
- the reactive functional group such as glycidyl group of the modified olefin resin (B) can react with the terminal carboxyl group of the polybutylene terephthalate resin (A). In some cases, the reaction with the resin (B) becomes insufficient and sufficient impact properties cannot be obtained.
- the amount of terminal carboxyl groups (acid value) of the polybutylene terephthalate resin is preferably 40 eq/ton or less, more preferably 30 eq/ton or less, and further preferably 25 eq/ton or less. From the viewpoint of reactivity with glycidyl groups and the like, the lower limit of the amount of terminal carboxyl groups (acid value) is 5 eq/ton.
- the amount of terminal carboxyl groups (acid value) (unit: eq/ton) of the polybutylene terephthalate resin (A) is, for example, a predetermined amount of polybutylene terephthalate resin dissolved in benzyl alcohol, and 0.01 mol/mol of sodium hydroxide is used. It can be measured by titration using a 1-benzyl alcohol solution. As the indicator, for example, a phenolphthalein solution may be used.
- the content of the polybutylene terephthalate resin (A) is 70 to 97 parts by mass.
- the amount is preferably 75 to 96 parts by mass, more preferably 80 to 95 parts by mass.
- the modified olefin resin (B) used in the present invention is an olefin resin modified so as to have a functional group capable of reacting with the terminal group (carboxyl group, hydroxyl group) of the polybutylene terephthalate resin (A).
- the functional group capable of reacting is preferably an acid anhydride group and/or a glycidyl group.
- the modified olefin resin (B) is preferably an ethylene copolymer obtained by copolymerizing maleic anhydride and/or glycidyl methacrylate.
- the copolymerization amount of maleic anhydride and/or glycidyl methacrylate in the ethylene copolymer is preferably 0.01 to 15% by mass in total, and more preferably 0.05 to 10% by mass. ..
- the modified olefin resin (B) can be produced by a generally known method.
- the arrangement of the copolymerization components is not particularly limited and may be, for example, random copolymerization or graft copolymerization.
- the glass transition temperature of the modified olefin resin (B) is preferably ⁇ 30° C. or lower. This can also improve the impact resistance of the polybutylene terephthalate resin composition at ⁇ 30° C. or lower.
- the modified olefin resin (B) may be copolymerized with a reactive component such as maleic anhydride and/or glycidyl methacrylate as well as a non-reactive component such as vinyl acetate or acrylate.
- a reactive component such as maleic anhydride and/or glycidyl methacrylate as well as a non-reactive component such as vinyl acetate or acrylate.
- One or more selected from the group may be copolymerized.
- the copolymerization amount of these components is not particularly limited, but is preferably 50% by mass or less, and more preferably 40% by mass or less, based on 100% by mass of the modified olefin resin. By copolymerizing these components, the compatibility with the polybutylene terephthalate resin (A) can be further increased.
- the modified olefin resin (B) of the present invention may be used in combination with an unmodified olefin copolymer and a modified olefin copolymer.
- the glass transition temperature of at least one copolymer used is ⁇ 30° C. or lower. This can also improve the impact resistance of the polybutylene terephthalate resin composition at ⁇ 30° C. or lower.
- the unmodified olefin-based copolymer and the modified olefin-based copolymer are used in combination, the total of both is considered as the content of the modified olefin-based resin (B), and the maleic anhydride and/or glycidyl methacrylate is used.
- the copolymerization amount of is considered to be the copolymerization amount with respect to the total mass of both.
- the content of the modified olefin-based copolymer is preferably 50% by mass or more, more preferably 70% by mass or more, 80 It is more preferably at least mass%.
- the content of the modified olefin resin (B) is 2 to 15 parts by mass.
- the amount is preferably 2 to 12 parts by mass, more preferably 3 to 10 parts by mass, and further preferably 3 to 9 parts by mass.
- the polyester elastomer (C) used in the present invention includes a hard segment composed of an aromatic dicarboxylic acid and a polyester having an aliphatic and/or alicyclic glycol as a constituent component, an aliphatic polyether, an aliphatic polyester and a fat. It is preferably a polyester elastomer to which at least one soft segment selected from the group polycarbonate is bonded.
- polyester elastomer (C) used in the present invention as the aromatic dicarboxylic acid constituting the hard segment polyester, a general aromatic dicarboxylic acid is widely used and is not particularly limited, but specific examples include terephthalic acid and isophthalic acid. Acids, orthophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'-dicarboxylic acid, 4,4'-biphenyldicarboxylic acid, and these Functional derivatives of.
- terephthalic acid Preferred are terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and 4,4'-biphenyldicarboxylic acid, which tend to have high crystallization rate and good moldability.
- aliphatic dicarboxylic acids such as adipic acid, sebacic acid, succinic acid, glutaric acid, dimer acid and their functional derivatives
- alicyclic dicarboxylic acids such as hexahydroterephthalic acid, hexahydroisophthalic acid and cyclohexanedicarboxylic acid and The functional derivative may be used in an amount of less than 50 mol% in the dicarboxylic acid component constituting the hard segment polyester.
- Components other than the aromatic dicarboxylic acid are preferably less than 50 mol%, more preferably less than 40 mol%, still more preferably less than 30 mol%, and when it is 50 mol% or more, the crystallinity of the polyester elastomer tends to decrease, Moldability and heat resistance tend to decrease.
- polyester elastomer (C) used in the present invention as the aliphatic or alicyclic glycol constituting the hard segment polyester, general aliphatic or alicyclic glycols are widely used and are not particularly limited, but mainly Desirably, it is an alkylene glycol having 2 to 8 carbon atoms.
- Preferred are ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,6-hexanediol and 1,4-cyclohexanedimethanol, and particularly preferred are ethylene glycol and 1,4-butanediol. Is either.
- ethylene terephthalate unit a unit consisting of terephthalic acid and ethylene glycol
- butylene terephthalate unit a unit consisting of terephthalic acid and 1,4-butanediol
- the aromatic polyester is a normal polyester. It can be easily obtained according to the production method of. Further, such polyester preferably has a number average molecular weight of 10,000 to 40,000.
- the soft segment of the polyester elastomer (C) used in the present invention is at least one selected from aliphatic polyether, aliphatic polyester, and aliphatic polycarbonate.
- the aliphatic polyether include polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, polyoxyhexamethylene glycol, polyoxytrimethylene glycol, a copolymer of ethylene oxide and propylene oxide, ethylene oxide of polyoxypropylene glycol. Examples thereof include adducts and copolymers of ethylene oxide and tetrahydrofuran.
- the aliphatic polyester include poly( ⁇ -caprolactone), polyenanthlactone, polycaprylolactone, and polybutylene adipate.
- the aliphatic polycarbonate preferably consists mainly of an aliphatic diol residue having 2 to 12 carbon atoms.
- these aliphatic diols include ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2, 2-dimethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,4-diethyl-1,5-pentanediol, 1,9-nonanediol, 2-methyl-1,8- Examples include octanediol.
- an aliphatic diol having 5 to 12 carbon atoms is preferable from the viewpoints of flexibility and low temperature characteristics of the obtained polyester elastomer (C). Based on the cases described below, these components may be used alone or in combination of two or more as required.
- the aliphatic polycarbonate diol constituting the soft segment of the polyester elastomer (C) that can be used and has good low-temperature characteristics one having a low melting point (for example, 70° C. or lower) and a low glass transition temperature is used. preferable.
- an aliphatic polycarbonate diol composed of 1,6-hexanediol used for forming a soft segment of a polyester elastomer has a low glass transition temperature of about ⁇ 60° C. and a melting point of about 50° C. Will be good.
- the aliphatic polycarbonate diol obtained by copolymerizing the above aliphatic polycarbonate diol with, for example, 3-methyl-1,5-pentanediol in an appropriate amount has a glass transition point with respect to the original aliphatic polycarbonate diol. Is slightly higher, but the melting point is lowered or becomes amorphous, so that it corresponds to an aliphatic polycarbonate diol having good low-temperature characteristics.
- an aliphatic polycarbonate diol composed of 1,9-nonanediol and 2-methyl-1,8-octanediol has a melting point of about 30° C. and a glass transition temperature of about ⁇ 70° C. Corresponds to a good aliphatic polycarbonate diol.
- the polyester elastomer (C) used in the present invention is a copolymer containing terephthalic acid, 1,4-butanediol, and polyoxytetramethylene glycol as main components for reasons of economy, heat resistance, and cold resistance. Is preferred.
- terephthalic acid is preferably 40 mol% or more, more preferably 70 mol% or more, further preferably 80 mol% or more, and 90 mol%. % Or more is particularly preferable.
- the total of 1,4-butanediol and polyoxytetramethylene glycol is preferably 40 mol% or more, more preferably 70 mol% or more, and 80 mol. % Or more is more preferable, and 90 mol% or more is particularly preferable.
- the number average molecular weight of the polyoxytetramethylene glycol is preferably 500 to 4000. If the number average molecular weight is less than 500, it may be difficult to develop the elastomer properties. On the other hand, when the number average molecular weight is more than 4000, the compatibility with the polyester portion constituting the hard segment of the polyester elastomer (C) decreases, and it may be difficult to copolymerize in a block form.
- the number average molecular weight of polyoxytetramethylene glycol is more preferably 800 or more and 3000 or less, and further preferably 1000 or more and 2500 or less.
- the mass ratio of hard segment/soft segment is preferably 85/15 to 35/65, and more preferably 75. /25 to 50/50.
- the hardness (surface hardness) of the polyester elastomer (C) used in the present invention is not particularly limited, but a wide range of polyester elastomers from low hardness of about Shore D hardness 25 to high hardness of about Shore D hardness 75 are used. It is possible and is preferably a Shore D hardness of 30 to 65, more preferably a Shore D hardness of 35 to 60.
- the reduced viscosity of the polyester elastomer (C) used in the present invention is preferably 0.5 dl/g or more and 3.5 dl/g or less when measured by the measuring method described below. If it is less than 0.5 dl/g, durability as a resin is low, and if it exceeds 3.5 dl/g, moldability may be insufficient.
- the reduced viscosity of the polyester elastomer (C) is more preferably 1.0 dl/g or more and 3.0 dl/g or less, and further preferably 1.3 dl/g or more and 2.8 dl/g or less.
- the acid value is preferably 200 eq/t or less, more preferably 60 eq/t or less.
- the polyester elastomer (C) used in the present invention can be manufactured by a known method.
- a lower alcohol diester of a dicarboxylic acid, an excess amount of a low molecular weight glycol, and a soft segment component are subjected to transesterification reaction in the presence of a catalyst, and the resulting reaction product is polycondensed, or a dicarboxylic acid and an excess amount of glycol and
- a method in which a soft segment component is subjected to an esterification reaction in the presence of a catalyst, and the resulting reaction product is polycondensed, or a hard segment is prepared in advance, and a soft segment component is added to this to randomize it by transesterification Any method may be used, such as a method of connecting a hard segment and a soft segment with a chain linking agent, and when poly( ⁇ -caprolactone) is used as a soft segment, an addition reaction of ⁇ -caprolactone monomer to the hard segment may be performed.
- the content of the polyester elastomer (C) is 1 to 15 parts by mass, preferably 2 to 14 parts by mass, and more preferably 3 to 13 parts by mass.
- the group bonded to the carbodiimide group is not particularly limited, and an aliphatic group, an alicyclic group, an aromatic group, or a group to which these organic groups are bonded (for example, a benzyl group , Phenethyl group, 1,4-xylylene group, etc.) and the like.
- carbodiimide compounds preferably used in the present invention include aliphatic carbodiimide compounds in which an aliphatic group is linked to a carbodiimide group, an alicyclic carbodiimide compound in which an alicyclic group is linked to a carbodiimide group, and a carbodiimide group
- carbodiimide group examples thereof include aromatic carbodiimide compounds in which an aromatic group or a group containing an aromatic group is linked.
- the carbodiimide compound (D) may be used alone or in combination of two or more.
- aliphatic carbodiimide compound examples include diisopropylcarbodiimide and dioctyldecylcarbodiimide
- specific examples of the alicyclic carbodiimide compound include dicyclohexylcarbodiimide and poly(4,4′-dicyclohexylmethanecarbodiimide).
- aromatic carbodiimide compound examples include diphenylcarbodiimide, di-2,6-dimethylphenylcarbodiimide, N-tolyl-N′-phenylcarbodiimide, di-p-nitrophenylcarbodiimide, di-p-aminophenylcarbodiimide, diphenylcarbodiimide, and diphenylcarbodiimide.
- the carbodiimide compound (D) is preferably a polycarbodiimide compound. Use of the polycarbodiimide compound tends to improve retention stability during melting.
- the molecular weight of the polycarbodiimide compound is preferably 2000 or more.
- the carbodiimide compound (D) is not an essential component, but when it is contained, the content (blending) amount thereof is not particularly limited as long as the object of the present invention is not impaired, but the fluidity of the polybutylene terephthalate resin composition is not limited.
- a range that does not impair the above a range of 0.05 to 1.5 parts by mass is preferable, and a range of 0.1 to 1.2 parts by mass is more preferable.
- the carbodiimide compound (D) plays a role as a compatibilizing agent for the polybutylene terephthalate resin (A) and the polyester elastomer (C) by reacting them, and also has a role of improving hydrolysis resistance and reducing gas at the time of molding.
- the carbodiimide compound (D) is a polycarbodiimide compound, and the content thereof is in the range of 0.05 to 1.5 parts by mass, whereby the polybutylene terephthalate resin (A) and the polyester elastomer (C) are compatibilized.
- the polybutylene terephthalate resin composition of the present invention may contain various known additives, if necessary, within a range that does not impair the characteristics of the present invention.
- Known additives include, for example, colorants such as pigments, mold release agents, heat resistance stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, modifiers, antistatic agents, flame retardants, and dyes.
- the release agent include long-chain fatty acid or its ester, metal salt, amide compound, polyethylene wax, silicone, polyethylene oxide and the like.
- the long-chain fatty acid preferably has 12 or more carbon atoms, and examples thereof include stearic acid, 12-hydroxystearic acid, behenic acid, and montanic acid. Partial or total carboxylic acid is esterified with monoglycol or polyglycol. Or may form a metal salt.
- the amide compound include ethylene bis terephthalamide and methylene bis stearyl amide. These release agents may be used alone or as a mixture.
- These various additives can be contained in a total amount of up to 5 parts by mass, when the total of (A), (B) and (C) is 100 parts by mass. In the polybutylene terephthalate resin composition, it is preferable that the total amount of the essential components (A), (B) and (C) is 95% by mass or more.
- Polybutylene terephthalate resin composition As a production method for producing the polybutylene terephthalate resin composition of the present invention, after blending the above-mentioned blending composition in an arbitrary blending sequence, it is mixed with a tumbler or a Henschel mixer and melt-kneaded.
- a melt-kneading method any method known to those skilled in the art can be used, and a single-screw extruder, a twin-screw extruder, a kneader, a Banbury mixer, a roll, or the like can be used. Among them, the twin-screw extruder is used. It is preferable. Further, in order to remove a volatile component at the time of processing and a low molecular component generated by decomposition of the resin, it is desirable to perform suction by a vacuum pump from a vent port near the die head at the tip of the extruder.
- the flow length (measurement conditions: cylinder temperature 250° C., mold temperature 50° C., injection pressure 80 MPa) obtained by injection molding the polybutylene terephthalate resin composition of the present invention is preferably 150 mm or more.
- the flow length is measured by an injection molding machine using a flow length evaluation mold having a flow passage having a width of 10 mm and a thickness of 1 mm, and detailed conditions are as described in the section of Examples.
- the flow length can be set to 150 mm or more.
- the flow length is more preferably 155 mm or more.
- the Charpy impact strength of the molded product obtained by injection molding the polybutylene terephthalate resin composition of the present invention is preferably 4.5 kJ/m 2 or more.
- the Charpy impact strength is measured according to ISO-179, and the detailed conditions are as described in the section of Examples. By obtaining the polybutylene terephthalate resin composition with the above composition, the Charpy impact strength can be 4.5 kJ/m 2 or more.
- Charpy impact strength According to ISO-179, a Charpy impact tester (DG-CB manufactured by Toyo Seiki Co., Ltd.) was used to measure at 23° C. (weighing 4.0 J, hammer lifting angle 150°). The test piece was injection molded with an ISO dumbbell test piece (thickness: 4 mm) at a cylinder temperature of 250° C. and a mold temperature of 50° C., and then cut and notched with a notching tool (Toyo Seiki Co., A-4). processed.
- DG-CB Charpy impact tester manufactured by Toyo Seiki Co., Ltd.
- B Modified olefin resin
- B-1 Bond First 7M (Sumitomo Chemical Co., Ltd. ethylene/methyl acrylate/glycidyl methacrylate copolymer, glass transition temperature -33° C., glycidyl methacrylate content 6% by mass)
- B-2) Bondine AX-8390 (Arkema's ethylene/ethyl acrylate/maleic anhydride copolymer, glass transition temperature ⁇ 35° C., maleic anhydride content 1.3% by mass)
- Carbodiimide compound (D) (D-1) Carbodilite LA-1 (Alicyclic carbodiimide manufactured by Nisshinbo Chemical Inc.) (D-2) Stabaxol P (aromatic carbodiimide manufactured by Rhein Chemie)
- Antioxidant Irganox 1010 (manufactured by BASF)
- Release agent Ricolb WE40 (manufactured by Clariant Japan)
- Examples 1 to 12 Comparative Examples 1 to 9>
- the ingredients were blended as shown in Table 1, melt-kneaded with a co-direction twin-screw extruder set to a cylinder temperature of 250° C., and the obtained strand was water-cooled and pelletized. The obtained pellets were dried at 130° C. for 4 hours and used in the above-mentioned evaluation tests. The results are shown in Table 1.
- the polybutylene terephthalate resin compositions of Examples 1 to 12 of the present invention use a polybutylene terephthalate resin having an intrinsic viscosity within a specific range and specify a modified olefin resin and a polyester elastomer.
- a modified olefin resin and a polyester elastomer By containing the compounding ratio, high Charpy impact strength and high fluidity are both achieved. Further, it can be confirmed that the Charpy impact strength is further improved by adding the carbodiimide compound.
- the present invention since it is possible to obtain a polybutylene terephthalate resin composition having excellent impact characteristics and high fluidity, it can be suitably used for applications in which precision molding is a problem, in thin-wall molding, weight reduction, This will greatly contribute to the industrial world, since the degree of freedom in shape can be improved and a molded product can be obtained easily.
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Abstract
Description
特許文献2では、ポリブチレンテレフタレート樹脂にエチレン-アルキルアクリレート-グリシジルメタクリレート共重合体を添加することで、比較トラッキング指数を維持したまま樹脂改質が可能であることを示している。しかしながら、ポリブチレンテレフタレート樹脂とグリシジル基が反応することにより、流動性が低下することは容易に推察される。
特許文献4では、ポリブチレンテレフタレート樹脂にコアシェルポリマー、ガラス繊維を併用することで、耐衝撃性、剛性の改良を施している。しかしながら、ガラス繊維の併用で流動抵抗が大きくなり、流動性は著しい低下を示すことが予想される。
[1] 固有粘度(IV)が0.60~0.95dl/gであるポリブチレンテレフタレート樹脂(A)70~97質量部、変性オレフィン系樹脂(B)2~15質量部、ポリエステルエラストマー(C)1~15質量部((A)、(B)及び(C)成分の合計が100質量部である)を含有するポリブチレンテレフタレート樹脂組成物。
[2] 前記ポリブチレンテレフタレート樹脂組成物を射出成形して得られる流動長(測定条件:シリンダー温度250℃、金型温度50℃、射出圧力80MPa)が150mm以上であることを特徴とする、[1]に記載のポリブチレンテレフタレート樹脂組成物。
[3] 前記ポリブチレンテレフタレート樹脂組成物を射出成形して得られる成形品のシャルピー衝撃強度が4.5kJ/m2以上であることを特徴とする、[1]または[2]に記載のポリブチレンテレフタレート樹脂組成物。
[4] 前記ポリブチレンテレフタレート樹脂組成物が、前記(A)、(B)及び(C)成分の合計100質量部に対して、さらにカルボジイミド化合物(D)0.05~1.5質量部を含有する、[1]~[3]のいずれかに記載のポリブチレンテレフタレート樹脂組成物。
[5] 前記変性オレフィン系樹脂(B)が、無水マレイン酸および/またはメタクリル酸グリシジルを合計で0.01~15質量%共重合したエチレン共重合体である、[1]~[4]のいずれかに記載のポリブチレンテレフタレート樹脂組成物。
本発明のポリブチレンテレフタレート樹脂組成物中の各成分の含有量(配合量)は、特に但し書きをしない限り、ポリブチレンテレフタレート樹脂(A)、変性オレフィン系樹脂(B)、及びポリエステルエラストマー(C)の合計を100質量部としたときの量で表している。本発明において、各成分の配合量は、そのままポリブチレンテレフタレート樹脂組成物中の含有量となる。
ポリブチレンテレフタレート樹脂(A)は、テレフタル酸またはそのエステル形成性誘導体を主たる成分とするジカルボン酸と、1、4-ブタンジオールまたはそのエステル形成性誘導体を主たる成分とするジオールとを重縮合反応させるなどの一般的な重合方法によって得ることができる重合体である。ポリブチレンテレフタレート樹脂(A)は、ブチレンテレフタレートの繰返し単位が80モル%以上であることが好ましく、90モル%以上であることがより好ましく、95モル%以上であることがさらに好ましく、100モル%であることが特に好ましい。
ポリブチレンテレフタレート樹脂の末端カルボキシル基量(酸価)は、40eq/ton以下であることが好ましく、より好ましくは30eq/ton以下であり、さらに好ましくは25eq/ton以下である。グリシジル基などとの反応性の観点から、末端カルボキシル基量(酸価)の下限は5eq/tonである。
本発明で用いられる変性オレフィン系樹脂(B)は、ポリブチレンテレフタレート樹脂(A)の末端基(カルボキシル基、水酸基)と反応しうる官能基を有するように変性されたオレフィン系樹脂である。該反応しうる官能基としては、酸無水物基および/またはグリシジル基が好ましい。変性オレフィン系樹脂(B)は、無水マレイン酸および/またはメタクリル酸グリシジルを共重合したエチレン共重合体であることが好ましい。その共重合量は、エチレン共重合体中、無水マレイン酸および/またはメタクリル酸グリシジルを合計で0.01~15質量%とすることが好ましく、0.05~10質量%とすることがより好ましい。変性オレフィン系樹脂(B)は、通常公知の方法で製造することが可能である。共重合成分の配列については特に限定されず、たとえば、ランダム共重合でもグラフト共重合でもよい。
変性オレフィン系樹脂(B)のガラス転移温度は-30℃以下であることが好ましい。これによりポリブチレンテレフタレート樹脂組成物の-30℃以下での耐衝撃性をも向上することができる。
未変性のオレフィン系共重合体と変性オレフィン系共重合体の合計を100質量%とすると、変性オレフィン系共重合体の配合量は50質量%以上が好ましく、70質量%以上がより好ましく、80質量%以上がさらに好ましい。
本発明で使用するポリエステルエラストマー(C)とは、芳香族ジカルボン酸と脂肪族および/または脂環族のグリコールを構成成分とするポリエステルからなるハードセグメントと、脂肪族ポリエーテル、脂肪族ポリエステルおよび脂肪族ポリカーボネートから選ばれる少なくとも1種のソフトセグメントが結合したポリエステルエラストマーであることが好ましい。
また、脂肪族ポリエステルとしては、ポリ(ε-カプロラクトン)、ポリエナントラクトン、ポリカプリロラクトン、ポリブチレンアジペートなどが挙げられる。
本発明におけるカルボジイミド化合物(D)は、分子中にカルボジイミド基(-N=C=N-)を有する化合物であれば特に制限されない。本発明で用いるカルボジイミド化合物(D)において、カルボジイミド基に結合する基は特に制限されず、脂肪族基、脂環族基、芳香族基、またはこれらの有機基が結合した基(例えば、ベンジル基、フェネチル基、1,4-キシリレン基など)などが挙げられる。本発明において好適に使用されるカルボジイミド化合物の例としては、カルボジイミド基に脂肪族基が連結した脂肪族カルボジイミド化合物、カルボジイミド基に脂環族基が連結した脂環族カルボジイミド化合物、および、カルボジイミド基に芳香族基または芳香族基を含む基が連結した芳香族カルボジイミド化合物などが挙げられる。カルボジイミド化合物(D)は、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
その他、本発明のポリブチレンテレフタレート樹脂組成物には、必要に応じて、本発明としての特性を損なわない範囲において、公知の各種添加剤を含有させることができる。公知の添加剤としては、例えば顔料などの着色剤、離型剤、耐熱安定剤、酸化防止剤、紫外線吸収剤、光安定剤、可塑剤、変性剤、帯電防止剤、難燃剤、染料などが挙げられる。
離型剤としては、長鎖脂肪酸またはそのエステルや金属塩、アマイド系化合物、ポリエチレンワックス、シリコン、ポリエチレンオキシドなどが挙げられる。長鎖脂肪酸としては、特に炭素数12以上が好ましく、例えばステアリン酸、12-ヒドロキシステアリン酸、ベヘン酸、モンタン酸などが挙げられ、部分的もしくは全カルボン酸が、モノグリコールやポリグリコールによりエステル化されていてもよく、または金属塩を形成していても良い。アマイド系化合物としては、エチレンビステレフタルアミド、メチレンビスステアリルアミドなどが挙げられる。これら離型剤は、単独であるいは混合物として用いても良い。
これら各種添加剤は、前記(A)、(B)及び(C)の合計を100質量部とした時、合計で5質量部まで含有させることができる。ポリブチレンテレフタレート樹脂組成物中、前記(A)、(B)及び(C)の必須成分の合計で、95質量%以上占めることが好ましい。
本発明のポリブチレンテレフタレート樹脂組成物を製造する製造法としては、上記配合組成にて任意の配合順列で配合した後、タンブラー或いはヘンシェルミキサーなどで混合し、溶融混練される。溶融混練方法は、当業者に周知のいずれかの方法が可能であり、単軸押出機、二軸押出機、ニーダー、バンバリーミキサー、ロールなどが使用できるが、なかでも二軸押出機を使用することが好ましい。また、加工時の揮発成分、樹脂が分解して生じる低分子成分を除去するため、押出機先端のダイヘッドに近いベント口から真空ポンプによる吸引を行うことが望ましい。
0.1gのサンプルをフェノール/テトラクロロエタン(質量比6/4)の混合溶媒25mlに溶解し、ウベローデ粘度管を用いて30℃で測定した。(単位:dl/g)
(2)ポリエステルエラストマーの還元粘度
0.05gのサンプルを25mlの混合溶媒(フェノール/テトラクロロエタン=60/40(質量比))に溶解し、オストワルド粘度計を用いて30℃で測定した。(単位:dl/g)
ポリブチレンテレフタレート樹脂(ポリエステルエラストマー)0.5gをベンジルアルコール25mlに溶解し、水酸化ナトリウムの0.01モル/lベンジルアルコール溶液を使用して滴定することにより測定した。指示薬は、フェノールフタレイン溶液を用いた。(単位:eq/ton)
(4)ポリエステルエラストマーの硬度(表面硬度)
JIS K7215(-1986)に準じて測定した。試験片は、シリンダー温度240℃、金型温度50℃にて作製した射出成形品(長さ100mm、幅100mm、厚み2mm)を3枚重ねたものを使用し、測定圧5000g、タイプDの圧子を用いたデュロメーターにより測定し、測定開始5秒後の値をD硬度(ショアD硬度)とした。
東芝機械社製の射出成形機(EC-100)、幅10mm、厚み1mmの流路を有する流動長評価金型を用い、射出圧力80MPa、シリンダー温度250℃、金型温度50℃にて、射出速度40mm/s、射出時間5s、冷却時間12s、成形サイクル20sで連続して20ショット射出成形を実施し、20ショット目の流動長を測定した。
(6)曲げ強度、曲げ弾性率
ISO-178に準じて測定した。試験片は、シリンダー温度250℃、金型温度50℃の条件で射出成形した。
(7)シャルピー衝撃強度
ISO-179に準じて、シャルピー衝撃試験機(東洋精機社製、DG-CB)を用いて23℃で測定した(秤量4.0J、ハンマー持ち上げ角150°)。試験片は、シリンダー温度250℃、金型温度50℃の条件で、ISOダンベル試験片(厚さ4mm)を射出成形したのち、ノッチングツール(東洋精機社製、A-4)にて切削、ノッチ加工した。
ポリブチレンテレフタレート樹脂(A);
(A-1)ポリブチレンテレフタレート樹脂: 固有粘度0.80dl/g、酸価15eq/ton
(A-2)ポリブチレンテレフタレート樹脂: 固有粘度0.75dl/g、酸価12eq/ton
(A-3)ポリブチレンテレフタレート樹脂: 固有粘度1.05dl/g、酸価17eq/ton
(B-1):ボンドファースト7M(住友化学工業社製 エチレン/アクリル酸メチル/グリシジルメタクリレート共重合体、ガラス転移温度-33℃、グリシジルメタクリレート含有量6質量%)
(B-2):ボンダインAX-8390(アルケマ社製 エチレン/アクリル酸エチル/無水マレイン酸共重合体、ガラス転移温度-35℃、無水マレイン酸含有量1.3質量%)
(C-1)テレフタル酸(TPA)//1,4-ブタンジオール(BD)/ポリオキシテトラメチレングリコール(PTMG;数平均分子量1000)=100//93/7(モル%)のポリエステルエラストマー(ハードセグメント/ソフトセグメントの質量比=75/25): 融点210℃、還元粘度1.5dl/g、酸価50eq/ton
(C-2)テレフタル酸(TPA)//1,4-ブタンジオール(BD)/ポリオキシテトラメチレングリコール(PTMG;数平均分子量1000)=100//84/16(モル%)のポリエステルエラストマー(ハードセグメント/ソフトセグメントの質量比=57/43): 融点198℃、還元粘度1.9dl/g、酸価35eq/ton
(D-1)カルボジライトLA-1(日清紡ケミカル社製 脂環族カルボジイミド)
(D-2)Stabaxol P(ラインケミー社製 芳香族カルボジイミド)
酸化防止剤: Irganox1010(BASF社製)
離型剤: リコルブWE40(クラリアントジャパン社製)
表1に示した通りに配合し、シリンダー温度250℃に設定した同方向二軸押出機で溶融混練を行い、得られたストランドを水冷し、ペレット化した。得られた各ペレットを130℃で4時間乾燥し、上述の各評価試験に用いた。結果を表1に記す。
Claims (5)
- 固有粘度(IV)が0.60~0.95dl/gであるポリブチレンテレフタレート樹脂(A)70~97質量部、変性オレフィン系樹脂(B)2~15質量部、ポリエステルエラストマー(C)1~15質量部((A)、(B)及び(C)成分の合計が100質量部である)を含有するポリブチレンテレフタレート樹脂組成物。
- 前記ポリブチレンテレフタレート樹脂組成物を射出成形して得られる流動長(測定条件:シリンダー温度250℃、金型温度50℃、射出圧力80MPa)が150mm以上であることを特徴とする、請求項1に記載のポリブチレンテレフタレート樹脂組成物。
- 前記ポリブチレンテレフタレート樹脂組成物を射出成形して得られる成形品のシャルピー衝撃強度が4.5kJ/m2以上であることを特徴とする、請求項1または2に記載のポリブチレンテレフタレート樹脂組成物。
- 前記ポリブチレンテレフタレート樹脂組成物が、前記(A)、(B)及び(C)成分の合計100質量部に対して、さらにカルボジイミド化合物(D)0.05~1.5質量部を含有する、請求項1~3のいずれかに記載のポリブチレンテレフタレート樹脂組成物。
- 前記変性オレフィン系樹脂(B)が、無水マレイン酸および/またはメタクリル酸グリシジルを合計で0.01~15質量%共重合したエチレン共重合体である、請求項1~4のいずれかに記載のポリブチレンテレフタレート樹脂組成物。
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Also Published As
Publication number | Publication date |
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KR20210126058A (ko) | 2021-10-19 |
JP7400743B2 (ja) | 2023-12-19 |
CN113412305A (zh) | 2021-09-17 |
EP3926004A1 (en) | 2021-12-22 |
EP3926004A4 (en) | 2022-10-12 |
US20220098362A1 (en) | 2022-03-31 |
JPWO2020166444A1 (ja) | 2021-12-16 |
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