Abstract: A composite molded article obtained by laser welding molded article composed of a polyester resin composition having a crystallinity of 15% or more as calculated with fast scanning calorimetry by a calculation method, wherein the calculation method includes using fast scanning calorimetry, the polyester resin composition is heated from 30° C. to 260° C. at 10000° C./second, then maintained at 260° C. for 0.1 second, then cooled to 80° C. at 5000° C./second, maintained at 80° C. for 0.1 second, then cooled to ?70° C. at 5000° C./second, and then heated to 260° C. at 1000° C./second, after which the curve obtained is used to calculate the crystallinity.

Abstract: A resin composition includes a polyolefin resin (a) and a polyamide resin (b) accounting for 100 wt % in total, the polyolefin resin (a) and the polyamide resin (b) accounting for 70 to 30 wt % and 30 to 70 wt %, respectively, and a surface of a molded resin product produced from the resin composition, analyzed by infrared microspectrometry, giving a spectrum peak intensity ratio of 3.0 to 5.0 as calculated by equation (1), wherein a melt viscosity ratio defined by equation (2) is 0.35 to 0.64 when measured at a shear rate of 1.216 second?1 and at a temperature of Tp+20° C., wherein Tp (° C.

Abstract: A composite molded article obtained by laser welding molded article composed of a polyester resin composition having a crystallinity of 15% or more as calculated with fast scanning calorimetry by a calculation method, wherein the calculation method includes using fast scanning calorimetry, the polyester resin composition is heated from 30° C. to 260° C. at 10000° C./second, then maintained at 260° C. for 0.1 second, then cooled to 80° C. at 5000° C./second, maintained at 80° C. for 0.1 second, then cooled to ?70° C. at 5000° C./second, and then heated to 260° C. at 1000° C./second, after which the curve obtained is used to calculate the crystallinity.

Abstract: A thermoplastic polyester resin composition has an excellent retention stability and is capable of producing a molded article excellent in mechanical properties and heat resistance as well as in long-term hydrolysis resistance; and the molded article. The thermoplastic polyester resin includes 100 parts by weight of a thermoplastic polyester resin (A) and 0.1 to 10 parts by weight of a biphenyl aralkyl-type epoxy resin or cyclopentadiene-type epoxy resin (B) of a specific type.

Abstract: A diol composition includes a diol as a major component and has an electrical conductivity of 0.6 to 30 mS/m.

Abstract: A thermoplastic polyester resin composition has an excellent retention stability and is capable of producing a molded article excellent in mechanical properties and heat resistance as well as in long-term hydrolysis resistance; and the molded article. The thermoplastic polyester resin includes 100 parts by weight of a thermoplastic polyester resin (A) and 0.1 to 10 parts by weight of a biphenyl aralkyl-type epoxy resin or cyclopentadiene-type epoxy resin (B) of a specific type.

Abstract: The present invention includes a flame-retardant thermoplastic polyester resin composition which provides a molded article having excellent tracking resistance and excellent mechanical characteristics, while maintaining high flame retardancy; and a molded article which is obtained by molding the flame-retardant thermoplastic polyester resin composition. A flame-retardant thermoplastic polyester resin composition of an embodiment of the present invention contains 1-70 parts by weight of two or more (C) phosphorus-containing flame retardants that are selected from the group consisting of (C-1) condensed phosphoric acid esters, (C-2) phosphazene compounds and (C-3) organic metal phosphinates and 1-90 parts by weight of (D) a nitrogen-containing flame retardant per 100 parts by weight of the total of 50-95 parts by weight of (A) a thermoplastic polyester resin and 5-50 parts by weight of (B) a methacrylic resin.

Abstract: A thermoplastic polyester resin composition has an excellent retention stability and is capable of producing a molded article excellent in mechanical properties and heat resistance as well as in long-term hydrolysis resistance; and the molded article. The thermoplastic polyester resin includes 100 parts by weight of a thermoplastic polyester resin (A) and 0.1 to 10 parts by weight of a biphenyl aralkyl-type epoxy resin or cyclopentadiene-type epoxy resin (B) of a specific type.

Abstract: The present invention includes a flame-retardant thermoplastic polyester resin composition which provides a molded article having excellent tracking resistance and excellent mechanical characteristics, while maintaining high flame retardancy; and a molded article which is obtained by molding the flame-retardant thermoplastic polyester resin composition. A flame-retardant thermoplastic polyester resin composition of an embodiment of the present invention contains 1-70 parts by weight of two or more (C) phosphorus-containing flame retardants that are selected from the group consisting of (C-1) condensed phosphoric acid esters, (C-2) phosphazene compounds and (C-3) organic metal phosphinates and 1-90 parts by weight of (D) a nitrogen-containing flame retardant per 100 parts by weight of the total of 50-95 parts by weight of (A) a thermoplastic polyester resin and 5-50 parts by weight of (B) a methacrylic resin.

Abstract: The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallized prepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (?Hma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance.

Abstract: A thermoplastic resin composition obtained by mixing 100 parts by weight of at least one thermoplastic resin (A) with 0.1 to 4 parts by weight of (B) a polyfunctional compound having three or more functional groups in which at least one of the terminal structures having the functional groups is a structure represented by formula (1): where R is an alkylene group with 1-15 carbon atoms; n is an integer of 1 to 10; and X is at least one functional group selected from the group consisting of hydroxyl group, aldehyde group, carboxyl group, sulfo group, amino group, isocyanate group, carbodiimide group, oxazoline group, oxazine group, amide group, silanol group and silyl ether group.

Abstract: A catalyst solution for polyester production includes a titanium compound (A) and an organic solvent (B), wherein particle diameter of particles included in the solution, which is measured by dynamic light scattering method and is subsequently determined by cumulant analysis method, is not greater than 200 nm.

Abstract: A diol composition includes a diol as a major component and has an electrical conductivity of 0.6 to 30 mS/m.

Abstract: A resin composition comprising a polylactic acid-based resin (A) and methacrylic resins (B), wherein the methacrylic resins having at least (a) a difference of 10° C. or more in glass transition temperature or (b) a difference of 3% or more in syndiotacticity; it is preferred that at least one of the methacrylic resins (B) is a methacrylic resin having a weight average molecular weight of 50,000 to 450,000, a glass transition temperature of 110° C. or higher and a syndiotacticity of 40% or more, and that the resin composition further contains a multilayer structure polymer formed as particles each consisting of a core layer and one or more shell layers covering it (C). A molded article made of said resin composition.

Abstract: A polylactic acid resin composition includes 0.15 to 0.90 parts by weight of an organic nucleating agent (B) in addition to 100 parts by weight of a polylactic acid resin (A) comprised of a poly-L-lactic acid component and a poly-D-lactic acid component. The polylactic acid resin composition satisfies (i) to (v): (i) amount of a linear oligomer of L-lactic acid and/or D-lactic acid is equal to or less than 0.3 parts by weight; (ii) rate of weight-average molecular weight retention is equal to or greater than 70% after the polylactic acid resin composition is retained in a closed state at 220° C. for 30 minutes; (iii) degree of stereocomplexation (Sc) exceeds 80%; (iv) stereocomplex crystal melting heat quantity ?Hmsc is equal to or greater than 30 J/g; and (v) cooling crystallization heat quantity (?Hc) is equal to or greater than 20 J/g.

Abstract: A resin composition comprising a polylactic acid-based resin (A) and methacrylic resins (B), wherein the methacrylic resins having at least (a) a difference of 10° C. or more in glass transition temperature or (b) a difference of 3% or more in syndiotacticity; it is preferred that at least one of the methacrylic resins (B) is a methacrylic resin having a weight average molecular weight of 50,000 to 450,000, a glass transition temperature of 110° C. or higher and a syndiotacticity of 40% or more, and that the resin composition further contains a multilayer structure polymer formed as particles each consisting of a core layer and one or more shell layers covering it (C). A molded article made of said resin composition.

Abstract: A thermoplastic resin composition includes 100 parts by weight of a thermoplastic resin including a polylactic acid resin (A); 10 to 50 parts by weight of a flame retardant (B); and 1 to 20 parts by weight of low melting point glass powder (C) having a median diameter (D50) in particle size distribution measurement of not greater than 6 ?m and a softening temperature of not higher than 600° C.

Abstract: The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallized prepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (?Hma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance.

Abstract: A resin composition includes a biodegradable resin (A), a polyolefin resin (B) and a dispersing agent (C), which has a sea-isle structure in which the biodegradable resin (A) is dispersed as isles in the polyolefin resin (B) existing as a sea component wherein the average dispersed particle size of the biodegradable resin (A) is 1 nm to 1000 nm.

Abstract: A resin composition is described that is excellent in strength, impact resistance, heat resistance and moldability, while further allowing for a reduction in the amount of CO2 needed for its production. The resin composition includes a styrene-based resin (A), an aliphatic polyester (B) and at least one species selected from a compatibilizer (C) and a dicarboxylic anhydride (D), wherein the compatibilizer is preferably at least one species selected from: (C-1) a methyl methacrylate polymer; (C-2) a vinyl-based polymer to which an epoxy unit or acid anhydride unit is copolymerized; (C-3) a graft polymer in which a methyl methacrylate unit is grafted to a rubbery polymer; and (C-4) a block copolymer having a polylactide segment and a vinyl-based polymer segment.