Showa Highpolymer Co., Ltd.

Showa Denko K.k.

Nippon Kayaku Kabushiki Kaisha

Taisei Corporation

Showa Highpower Co., Ltd.

Showa Highpoymer Co., Ltd.

Eiichiro Takiyama

Ryosuke Kamei

Toshiaki Hanyuda

Akira Nakamura

Tetuya Takahashi

Takashi Fujimaki

Mitsuhiro Imaizumi

Takao Hokari

Shigenori Terazono

Takeshi Takahashi

Katsuhisa Morita

Toshio Taka

Toshiaki Sugimoto

Yuichiro Yasukawa

Ryushi Ogura

Yoshitaka Hatano

Yositaka Hatano

Yoshihiro Moteki

Hideharu Kimura

Masataka Kotani

Noriaki Harigai

Tadayuki Hosogane

Haruhiko Kondo

Shigekatu Seki

Yasuji Komatsu

Isamu Niikura

Kenji Sugimoto

Takeshi Iwasa

Akira Yokoyama

Yasushi Ichikawa

Hitoshi Uda

Jun Suzuki

Ryutaro Fujihira

Kojiro Mori

Susumu Nagao

Hiroshi Nakajima

Tohei Horishima

Yasushi Morohashi

Tetsuo Yasuda

Toshiaki Hino

Katsutoshi Muramatsu

Jun Hasegawa

Haruyuki Kanehiro

Goichi Yamaguchi

Hiroshi Danbara

Yorikatsu Hohokabe

Seiichi Takano

Toshikazu Tsukui, Deceased

Nobutaka Fujiwara

Yukiharu Euruichi

A urea-resin composition comprising a urea-formaldehyde reaction product, cellulose material, and at least one substance selected from the group cosisting of .alpha.-amino acid, powdered collagen and gelatin. The present invention provides urea-resin compositions which, having a property to harden under heating, are themselves biodegradable and have sufficient physical properties to be applied for practical purposes.

Biodegradable thermosetting urea-resin compositions

Aliphatic polyester resin and method for producing same

An aliphatic polyester resin composition having a low combustion beat, characterized in that a filler is mixed with an aliphatic polyester having a number-average molecular weight of at least 10,000, synthesized from glycol and aliphatic polybasic acid or acid derivative thereof. A sheet formed from the composition bas excellent tensile strength, stiffness and impact strength as well as being biodegradable.

Polyester resin composition

Nonwoven fabrics made of an aliphatic polyester having a melt viscosity of 5.0.times.10.sup.2 -2.times.10.sup.4 poises at a temperature of 190.degree. C. at a shear rate of 100 sec.sup.-1 and a melting point of 70.degree.-190.degree. C. The nonwoven fabric has biodegradability when it is buried in the ground and it is also excellent in tensile strength and tear propagation strength. Thus, the nonwoven fabric of the present invention is useful for sanitary materials, medical materials, packaging materials, agricultural covering materials, filters, oil absorption materials, materials for a daily life, padding cloth materials for clothes, cell separators, drain sheets for constructions and the like.

Nonwoven polyester fabric

Thermo-curable resin composition, and a method for producing a

Method of producing a high molecular weight aliphatic polyester and film

Injection-molded articles consisting of an aliphatic polyester having a melt viscosity of 6.times.10.sup.2 -2.times.10.sup.4 poises at a temperature of 190.degree. C. at a shear rate of 1000 sec.sup.-1 and a melting point of 70.degree.-190.degree. C. The present invention provides injection-molded articles excellent in heat stability and mechanical strength as well as having biodegradability which can be used for industrial parts, automotive members, food and beverage containers, gardening pots and the like.

Polyester injection-molded articles

A biodegradable disposable diaper comprising a combination of a liquid absorbing material, a liquid permeable surface material and an leakproof backing material, said liquid permeable material being formed of an aliphatic polyester resin obtained by reacting an aliphatic saturated polyester prepolymer having an end group which is materially a hydroxyl group with a coupling agent or formed of said aliphatic polyester resin and an aliphatic saturated polyester resin which has not been treated by said coupling agent. The disposable diaper has excellent mechanical strength, softness, feel of touch, productivity as well as biodegradability, air permeability and waterproofness.

Biodegradable disposable diaper

An unsaturated alkyd having a number-average molecular weight of at least 5000 and having terminal carboxyl groups is provided by esterification and then deglycolization reaction of an .alpha.,.beta.-unsaturated polybasic acid or an polyhydroxy alcohol followed by reaction with polybasic acid anhydride to substitute more than 10 mole % of terminal hydroxyl groups with carboxyl groups. High molecular weight unsaturated polyester resin is also provided by formulating the unsaturated alkyd with a copolymerizable monomer such as styrene. The polyester resin can be widely used in a various applications by employing the excellent physical properties thereof.

High-molecular unsaturated polyester resin

Foamed thin materials such as foamed film and foamed fibrillated materials produced by extruding a composition consisting of 100 parts by weight of aliphatic polyester having a melt viscosity of 1.0.times.10.sup.3 -1.0.times.10.sup.5 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-200.degree. C., and 0.2-5 parts by weight of foaming agent. These foamed thin materials has biodegradability, excellent mechanical, insulating, touch and aesthetic properties. They are useful materials as insulating, packaging, oil absorbing materials and filters.

Polyester foamed thin materials

Polyester laminates formed by coating by melt-extruding an aliphatic polyester having a melt viscosity of 1.0.times.10.sup.3 -1.0.times.10.sup.5 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-200.degree. C. on to paper or cloth. The resin can be coated on paper or cloth at a low temperature with firm adherency, and the sheet thus formed is biodegradable.

Polyester laminates

Polyester fiber consisting of an aliphatic polyester having a melt viscosity of 1.0.times.10.sup.2 -1.0.times.10.sup.4 poises at a temperature of 190.degree. C. at a shear rate of 1000 sec.sup.-1 and a melting point of 70-190.degree. C. The polyester fiber of the present invention exhibits biodegradability when buried in the ground. The amount of combustion heat generated on incineration is smaller than that of polyethylene and polypropylene. The polyester fiber of the present invention has excellent physical properties.

Polyester fibers

Flat and split yarn formed by extrusion molding, comprising as a main component an aliphatic polyester having a melt viscosity of 2.0.times.10.sup.3 -4.0.times.10.sup.4 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-190.degree. C. The present invention provides flat and split yarn having excellent in heat stability and mechanical strength as well as having biodegradability.

Polyester flat and split yarn

Blow-molded articles consisting of an aliphatic polyester having a melt viscosity of 3.0.times.10.sup.3 -2.0.times.10.sup.5 poises at a temperature of 190.degree. C. at a shear rate of 100 sec.sup.-1 and a melting point of 70.degree.-190.degree. C. The present invention provides blow-molded articles excellent in heat stability and mechanical strength as well as having biodegradability which can be used for containers of detergents, cosmetics and the like, and industrial parts.

Polyester blow-molded articles

An aliphatic polyester film which is synthesized from a glycol and an aliphatic polybasic acid having a melt viscosity of 2,000-100,000 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-200.degree. C. The film is excellent in heat stability and mechanical strength as well as biodegradability when buried in the earth; and has low combustion heat than polyethylene and polypropyrene.

Polyester film

Growing community of inventors

Kamakura, Japan

Eiichiro Takiyama