Abstract: To provide a lactic acid polymer composition excellent in transparency, heat resistance and productivity, a molded article, a sheet and a multilayer sheet each of which comprises the composition, a thermoformed article obtained by secondary-forming the sheet or the multilayer sheet, and a process for producing the thermoformed article with excellent productivity. The lactic acid polymer composition of the invention comprises 100 parts by weight of a lactic acid polymer (A), 0.1 to 3 parts by weight of an organic crystal nucleating agent (B) comprising an aliphatic carboxylic acid amide having an amide bond, and 0.1 to 7 parts by weight of a crystallization accelerator (C). The thermoformed article of the invention is obtained with excellent production efficiency by thermoforming the sheet comprising the composition of the invention at a temperature of 60 to 130° C.

Abstract: A biodegradable resin composition that exhibits excellent antistatic properties and antifogging properties while maintaining its molecular weight to such a degree as to provide practically satisfactory strength of a molded article molded even according to a kneading process.

Abstract: To provide a lactic acid polymer composition excellent in transparency, heat resistance and productivity, a molded article, a sheet and a multilayer sheet each of which comprises the composition, a thermoformed article obtained by secondary-forming the sheet or the multilayer sheet, and a process for producing the thermoformed article with excellent productivity. The lactic acid polymer composition of the invention comprises 100 parts by weight of a lactic acid polymer (A), 0.1 to 3 parts by weight of an organic crystal nucleating agent (B) comprising an aliphatic carboxylic acid amide having an amide bond, and 0.1 to 7 parts by weight of a crystallization accelerator (C). The thermoformed article of the invention is obtained with excellent production efficiency by thermoforming the sheet comprising the composition of the invention at a temperature of 60 to 130° C.

Abstract: [Object] To provide a biodegradable resin composition that exhibits excellent antistatic properties and antifogging properties while maintaining its molecular weight to such a degree as to provide practically satisfactory strength of a molded article molded even according to a kneading process.

Abstract: Provided is a lactic acid-based resin composition that comprises a lactic acid-based resin (component (A)), and an ethylene-unsaturated carboxylic acid copolymer (component (B)) and/or an ethylene-unsaturated carboxylic acid copolymer ionomer (component (C)). The lactic acid-based resin composition has good physical properties in melt and can be efficiently formed into films and laminates through casting or extrusion lamination. The paper laminates obtained through extrusion lamination with the resin composition have good moisture barrier property, and have the advantages of good antibacterial ability, good biodegradability and low combustion heat. And the moldings obtained from the resin composition of the invention have a characteristic which is excellent in impact strength. Further, the films and sheets formed of the resin composition have good low-temperature heat-sealability and hot-tack sealability, and the resin composition well serves as a sealant.

Abstract: The invention provides an aliphatic polyester resin composition that contains 100 parts by weight of an aliphatic polyester resin and from 10 to 60 parts by weight of at least one compound of a formula (1): wherein n indicates an integer of from 1 to 9, R1 to R4 each independently represent an alkyl group having from 1 to 17 carbon atoms, and when n is 2 or more, R3 may differ in different units, a film formed of the composition, and packages with the film. The aliphatic polyester film of the invention keeps the degradability in the natural environment that is intrinsic to lactic acid-based polymer, and has good heat resistance, flexibility, transparency and adhesiveness, and, in addition, the plasticizer does not migrate to the surface of the film.

Abstract: Provided is a lactic acid-based resin composition that comprises a lactic acid-based resin (component (A)), and an ethylene-unsaturated carboxylic acid copolymer (component (B)) and/or an ethylene-unsaturated carboxylic acid copolymer ionomer (component (C)). The lactic acid-based resin composition has good physical properties in melt and can be efficiently formed into films and laminates through casting or extrusion lamination. The paper laminates obtained through extrusion lamination with the resin composition have good moisture barrier property, and have the advantages of good antibacterial ability, good biodegradability and low combustion heat. And the moldings obtained from the resin composition of the invention have a characteristic which is excellent in impact strength. Further, the films and sheets formed of the resin composition have good low-temperature heat-sealability and hot-tack sealability, and the resin composition well serves as a sealant.

Abstract: A resin composition (AA) comprising an aliphatic polyester or aliphatic polyamide (component (A)), a plastic having a melting point or glass transition temperature (Tg) of ?10° C. or more (component (B)) and a radical generating agent (C), wherein the compounding ratio of the component (A), the component (B) and the radical generating agent (C), based on the total weight thereof, is: 1 to 98.995% by weight of the component (A), 98.995 to 1% by weight of the component (B), and 0.005 to 5% by weight of the radical generating agent (C), and an aliphatic unsaturated polybasic acid (a) is contained in the polymer constituent of the component (A) and/or the component (B). The resin composition is suitable as a starting material of biodegradable material which maintains transparency, is free of bleeding of a plasticizer, is endowed with flexibility and has other advantageous characteristics so that it can be used in various fields.

Abstract: A lactic acid-based resin composition containing a mixture of (A) a mixture of (a1) polylactic acid and (a2) an aliphatic polyester, and (B) an aliphatic block co-polyester having a polylactic acid segment and an aliphatic polyester segment, wherein the aliphatic block co-polyester (B): (1) contains a lactic acid component in an amount of from 20 to 80 wt % in terms of monomer, (2) has a weight average molecular weight of 1,000 or more and less than 60,000, and (3) has a weight average molecular weight of the polylactic acid segment of from 500 to 55,000 and a weight average molecular weight of the aliphatic polyester segment of from 500 to 55,000. A molded article formed from the composition can be a film, a sheet, a filament.

Abstract: A resin composition comprising: 30 to 95 parts by weight of a biodegradable polylactic acid resin (A), and 70 to 5 parts by weight of a specified polyalkylene carbonate (B), providing that the sum of components (A) and (B) is 100 parts by weight. The invention provides an excellent resin composition which is biodegradable, transparent, flexible and has gas barrier properties and which is free from the occurrence of bleedout with the passage of time. Further, the resin composition of the invention is excellent in moldability, so that a variety of molded articles can be produced by various molding techniques and put to practical use. The resultant molded articles, when disposed of after use, exhibit high biodegradability in natural environment.

Abstract: The invention provides an aliphatic polyester resin composition that contains 100 parts by weight of an aliphatic polyester resin and from 10 to 60 parts by weight of at least one compound of a formula (1): 1

Abstract: The invention is to provide a multi-layered polyester film having good heat-sealability and transparency and suitable to secondary working into bags, etc. The film comprises a layer (layer A) that contains a polyhydroxycarboxylic acid-type aliphatic polyester (polyester A) and a layer (layer B) that contains a diol-dicarboxylic acid polycondensation-type polyester (polyester B).

Abstract: A resin composition comprising: 30 to 95 parts by weight of a biodegradable polylactic acid resin (A), and 70 to 5 parts by weight of a specified polyalkylene carbonate (B), providing that the sum of components (A) and (B) is 100 parts by weight. The invention provides an excellent resin composition which is biodegradable, transparent, flexible and has gas barrier properties and which is free from the occurrence of bleedout with the passage of time. Further, the resin composition of the invention is excellent in moldability, so that a variety of molded articles can be produced by various molding techniques and put to practical use. The resultant molded articles, when disposed of after use, exhibit high biodegradability in natural environment.

Abstract: The present invention provides a lactic acid-based resin composition comprising a mixture of (A) a mixture of (a1) polylactic acid and (a2) an aliphatic polyester, and (B) an aliphatic block co-polyester having a polylactic acid segment and an aliphatic polyester segment, wherein the aliphatic block co-polyester (B): (1) contains a lactic acid component in an amount of from 20 to 80 wt % in terms of monomer, (2) has a weight average molecular weight of 1,000 or more and less than 60,000, and (3) has a weight average molecular weight of the polylactic acid segment of from 500 to 55,000 and a weight average molecular weight of the aliphatic polyester segment of from 500 to 55,000. The lactic acid-based resin composition of the invention has transparency and flexibility because the respective compositional resins are effectively dispersed.

Abstract: An aliphatic polyester formed item having transparency and crystallinity in combination by crystallizing, in the course of or after processing, an aliphatic polyester composition comprising aliphatic polyester and one or more transparent nucleating agent selected from the group consisting of aliphatic carboxylic acid amide, aliphatic carboxylic acid salt, aliphatic alcohol and aliphatic carboxylic acid ester having a melting point of 40-300° C.

Abstract: The invention provides an aliphatic polyester formed item having transparency and crystallinity in combination by crystallizing, in the course of or after processing, an aliphatic polyester composition comprising aliphatic polyester and one or more transparent nucleating agent selected from the group consisting of aliphatic carboxylic acid amide, aliphatic carboxylic acid salt, aliphatic alcohol and aliphatic carboxylic acid ester having a melting point of 40-300° C.

Abstract: A polylactic acid-based resin composition composed of a high molecular ingredient (A) comprising polylactic acid (a1) and an aliphatic polyester (B), and a film, particularly an inflation film, prepared from the resin composition. The film comprising the polylactic acid-based resin composition of the invention is biodegradable and excellent in flexibility and resistance to blocking of film and bleeding-out of plasticizer, has no anisotropy in tear strength, and can be suitably used for an agricultural multi-film and garbage bag. When the film of the invention is used for food wrapping, the film prevents fungus growth and contamination of color or odor, and thus can be suitably used.

Abstract: A biodegradable lubricative resin composition which withstands use as a material for sliding parts, and slide bearings and gears made from such a resin composition. The resin composition contains an aliphatic polyester which is a monopolymer or copolymer of a hydroxy-carboxylic acid or an aliphatic polyhydroxy alcohol and an aliphatic polybase, the aliphatic polyester preferably containing 50-100 wt % lactic acid, and a lubricant which is a lubricating oil or a solid lubricant. Slide bearings and gears molded from such a resin composition are also proposed.

Abstract: A thermal resistant resin composition comprising 100 parts by weight of polyester (A) having 25-75% by weight of a lactic acid component consisting of 25-75% by weight of a lactic acid-based polymer (a1) and 25-75% by weight of other aliphatic polyester (a2) having a melting point of 100-250.degree. C., and 0.1-70 parts by weight of a crystalline inorganic filler (B) containing 10% by weight or more of SiO.sub.2. The thermal resistant resin composition of the invention performs following function:1) injection molding can be carried out at a mold temperature of Tg or less or around room temperature with a short molding-cycle,2) quick crystallization velocity and satisfactory crystallinity can be attained in the molding step, and3) the molded articles have, as a result, excellent thermal resistance and generate properties of low deterioration of a high polymer component and slow embrittlement in use.

Abstract: A preparation process of polyhydroxycarboxylic acid comprising conducting dehydration polycondensation of hydroxycarboxylic acid or an oligomer of the same in a reaction mixture containing said hydroxycarboxylic acid or the oligomer of the same and an organic solvent substantially in the absence of water to give polyhydroxycarboxylic acid having an weight average molecular weight of 50,000 or more, successively mixing the reaction mixture containing said polyhydroxycarboxylic acid with at least one binder selected from the group consisting of (1) polyisocyanate compound, (2) polybasic acid anhydride, (3) cyclic imino ester, (4) cyclic imino ether, (5) aromatic hydroxycarboxylic acid, (6) polyamino compound, (7) polyhydric alcohol, (8) epoxy compound, (9) polyfunctional aziridine compound, (10) lactam, (11) lactone, and (12) diethylene glycol bischloroforate, and reacting to obtain polyhydroxycarboxylic acid having a weight average molecular weight of 100,000 or more the polyhydroxycarboxylic acid which is obt