Jsp Corporation

Director-general of Agency of Industrial Science and Technology

Mitsubishi Gas Chemical Company, Inc.

Akira Iwamoto

Yutaka Tokiwa

Masahiro Harada

Kenichi Takase

Toru Kino

Kiyoshi Takeda

Takashi Kawada

Teizi Urakami

Yoshiaki Momose

Shigeki Imagawa

Makoto Matsumura

An object of the present invention is to provide a multi-layered polylactic acid resin foamed body of a crystalline polylactic acid resin which has good appearance and excellent mechanical strength such as bending strength and compressive strength and which is capable of being imparted with excellent heat resistance, and to provide a multi-layered polylactic acid resin foamed molded article having excellent appearance, heat resistance and mechanical strengh. The multi-layered polylactic acid resien foamed body of the present invention is a laminate having a polylactic acid resin foamed layer and a thermoplastic resin layer provided at least one side of the foamed layer, wherein the foamed layer has a cell shape satisfying specific conditions, wherein the difference (&#x394;H&#x2212;&#x394;H) between an endothermic calorific value (&#x394;H) and an exothermic calorific value (&#x394;H) of the foamed layer as measured by heat flux differential scanning calorimetry at a heating rate of 2&#xb0; C./min is less than 40 J/g, and wherein the endothermic calorific value (&#x394;H) is at least 10 J/g and the exothermic calorific value (&#x394;H) is at least 3 J/g.

Multi-layered polylactic acid resin foamed body and multi-layered polylactic acid resin foamed molded article

A foamed sheet of a base resin containing 50 to 100% by weight of a polylactic acid resin and having an apparent density of 63 to 630 kg/m, a thickness of 0.5 to 7 mm and endothermic and exothermic calorific values of &#x394;Hand &#x394;H, respectively, as measured by heat flux differential scanning calorimetry at a heating rate of 2&#xb0; C./min. The endothermic calorific value &#x394;His at least 10 J/g and the difference (&#x394;H&#x2212;&#x394;H) between the endothermic calorific value &#x394;Hand the exothermic calorific value &#x394;His less than 40 J/g. A foam molding such as a receptacle is prepared by thermoforming the foamed sheet.

Foamed sheet of polylactic acid resin, foam molding of polylactic acid resin and method of preparing foam molding

A biodegradable plastic composition for forming biodegradable shaped bodies which includes a poly-.beta.-hydroxybutyrate having a viscosity of n.sub.A at 185.degree. C. and a polycaprolactone having a viscosity of n.sub.B at 185.degree. C., wherein the poly-.beta.-hydroxybutyrate is present in an amount C.sub.A of 10-45 or 55-85% by weight based on the total weight of the poly-.beta.-hydroxybutyrate and the polycaprolactone, and wherein n.sub.A, n.sub.B and C.sub.A satisfy the following condition:

Biodegradable plastic composition and biodegradable plastic shaped body

Biodisintegrable thermoplastic resin moldings and a process for producing same are disclosed, the biodisintegrable thermoplastic resin moldings being comprised of a thermoplastic aliphatic polyester resin as a matrix resin having dispersed therein an other type of thermoplastic resin in a proportion of 40-75 weight % based on the whole resin. The biodisintegrable thermoplastic resin moldings is easily disintegrable after disposal in an environment where microorganisms exist so that the moldings can be reduced in bulkness and give no harmful effect on the life of natural plants and animals. Thus, the present invention affords an effective means for solving various problems in the treatment of disposed plastic articles.

Biodisintegrable thermoplastic resin moldings and a process for

A biodegradable plastic composition is disclosed which includes a polycaprolactone and a poly-.beta.-hydroxybutyrate. Disclosed also is a biodegradable plastic shaped body formed of such a composition. The shaped body may be produced by melt-mixing a blend of a polycaprolactone, a poly-.beta.-hydroxybutyrate and a copolymerization catalyst to copolymerize a portion of the polycaprolactone with a portion of the poly-.beta.-hydroxybutyrate, thereby to obtain a caprolactone/.beta.-hydroxybutyric acid copolymer-containing melt, which is subsequently shaped into a desired form.

Biodegradable plastic composition, biodegradable plastic shaped body and

A biodisintegrable thermoplastic resin foam and a process for producing same are disclosed, the biodisintegrable thermoplastic resin foam being comprised as a substrate thereof a mixed resin comprising 5-40 weight % of a thermoplastic resin decomposable by microorganisms and 95-60 weight % of a thermoplastic resin not decomposable by microorganisms and being characterized in that the individual aerial cells constituting the foam have an average cell wall thickness of 1-100 .mu.m and an apparent density of 0.5 g/cm.sup.3 or less than 0.5 g/cm.sup.3. The biodisintegrable thermoplastic resin foam is easily disintegrable after disposal in an environment where microorganisms exist so that it can be reduced in bulkness and gives no harmful effect on the life of natural plants and animals. The foam incorporated with a filler can be promoted in disintegration by microorganisms. Thus the present invention affords an effective means for solving various problems in the treatment of disposed materials.

Biodisintegrable thermoplastic resin foam and a process for producing

A biodisintegrable thermoplastic resin foam and a process for producing same are disclosed, the biodisintegrable thermoplastic resin foam being comprised as a substrate thereof a mixed resin comprising 5-40 weight % of a thermoplastic resin decomposable by microorganisms and 95-60 weight % of a thermoplastic resin not decomposable by microorganisms and being characterized in that the individual aerial cells constituting the foam have an average cell wall thickness of 1-100 .mu.m and an apparent density of 0.5 g/cm.sup.3 or less than 0.5 g/cm.sup.3. The biodisintegrable thermoplastic resin foam is easily disintegrable after disposal in an environment where microorganisms exist so that it can be reduced in bulkness and gives no harmful effect on the life of natural plant and animals. The foam incorporated with a filler can be promoted in disintegration by microorganisms. Thus the present invention affords an effective means for solving various problems in the treatment of disposed materials.

A transparent gas-barrier multilayer structure comprising (A) at least one layer of a polyamide composition comprising (a) 30 to 80 parts by weight of a first polyamide composed of an aromatic dicarboxylic acid as a main acid component and an aliphatic diamine as a main diamine component and (b) 70 to 20 parts by weight of a second polyamide composed of an aliphatic dicarboxylic acid as a main acid component and m-xylylenediamine as a main diamine component, the total amount of the first polyamide and the second polyamide being 100 parts by weight, and (B) at least one layer of a thermoplastic resin other than the polyamide composition, said at least one layer (A) being bonded to said at least one layer (B).

Transparent gas-barrier multilayer structure

A gas-barrier multilayered structure comprising (A) at least one layer of a copolyamide composed of (a) a dicarboxylic acid component composed of 55 to 70 mole % of an aliphatic dicarboxylic acid component and 45 to 30 mole % of an aromatic dicarboxylic acid component consisting substantially of 20 to 30 mole % of isophthalic acid and 5 to 20 mole % of terephthalic acid, and (b) a diamine component composed substantially of a m-xylylenediamine component, and (B) at least one layer of a thermoplastic resin other than the copolyamide. Instead of the layer (A), there can be used (A') at least one layer of a mixture of 40 to 60 % by weight of a first copolyamide composed of (a) a dicarboxylic acid component composed of 55 to 70 mole % of an aliphatic dicarboxylic acid component and 45 to 30 mole % of an aromatic dicarboxylic acid component consisting substantially of 20 to 30 mole % of isophthalic acid and 5 to 20 mole % of terephthalic acid and (b) a diamine component composed substantially of m-xylylenediamine and 60 to 40 % by weight of a second polyamide composed of a dicarboxylic acid component consisting substantially of an aliphthalic dicarboxylic acid component and a diamine component consisting substantially of a m-xylylenediamine component.

Growing community of inventors

Tsukuba, Japan

Akira Iwamoto