Showa Denko K.k.

Showa Highpolymer Co., Ltd.

Other

Toppan Printing Co., Ltd.

Showa Denko Kabushiki Kaisha

Showa Highpower Co., Ltd.

Yoichi Hirose

Takashi Fujimaki

Eiichiro Takiyama

Kunio Komaki

Masaaki Yanagisawa

Yoshihiro Moteki

Mitsuhiro Imaizumi

Noriaki Harigai

Takao Hokari

Yoshitaka Hatano

Shigekatu Seki

Masayuki Taniguchi

Hideharu Kimura

Yasushi Ichikawa

Hiroshi Umeyama

Shigenori Terazono

Takeshi Takahashi

Jun Suzuki

Tadayuki Hosogane

Isamu Yamamoto

Ryutaro Fujihira

Toshiaki Hino

Thoru Watanabe

Aliphatic polyester resin and method for producing same

Stretched blow molding articles are prepared by using an aliphatic polyester composition having a melting point of at least 70.degree. C. including: 97.5 to 75 parts by weight of an aliphatic polyester copolymer (A) having a Mn of at least 50,000 which is obtained by reacting 100 parts by weight of a polyester diol (a) with 0.1 to 5 parts by weight of diisocyanate, wherein the polyester diol (a) is obtained by conducting a polycondensation of 1 mol of an acid component consisting of 70 to 90 mol % of succinic acid and 10 to 30 mol % of adipic acid, with 1 to 1.1 mol of glycol; and 2.5 to 25 parts by weight of potybutylene succinate (B) with a linear structure, (C) with a branched long chain structure, or (D) with a branched longer chain structure, which have an Mn of at least 50,000 and are composed from some of succinic acid, 1,4-butanediol, polyfunctional comonomer and di- or poly-functional coupling agents.

Stretched blow molding articles

Method of producing a high molecular weight aliphatic polyester and film

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

A method for manufacturing a biodegradable high molecular weight aliphatic polyester. This method comprises the steps of: [A] synthesizing an aliphatic polyester having a number average molecular weight of at least 5,000 and/or a weight average molecular weight of at least 30,000 by reacting aliphatic or alicyclic glycol with aliphatic dicarboxylic acid or its anhydride, applying a 0.001-0.5 part by weight of organic or inorganic metallic compound as a catalyst with respect to 100 parts by weight of aliphatic polyester to be produced; [B] adding a 0.01-3 parts by weight of organic or inorganic phosphorus compound with respect to 100 parts by weight of aliphatic polyester upon completion of the reaction; and [C] reacting a 0.1-5 parts by weight of polyvalent isocyanate compound with 100 parts by weight of the aliphatic polyester so that the polyester has a number average molecular weight of at least 10,000 and/or a weight average molecular weight of at least 50,000.

Method for manufacturing biodegradable high molecular aliphatic polyester

A composite diamond grain which comprises a heat-resistant grain as a nucleus and discrete diamond crystal particles distributed on the surface of the grain or diamond crystal films formed to cover the entire surface of the grain and a method for producing the composite diamond grain by the vapor-phase process are disclosed. For the filament method which is one form of the vapor-phase method, tantalum is useful as the material for the filament. Since tantalum is susceptible of embrittlement by hydrogen, a treatment to be performed on tantalum for the elimination of this drawback is also disclosed.

Composite diamond grain and method for production thereof

Composite diamond granules

Composite diamond grain

Growing community of inventors

Tokyo, Japan

Takashi Fujimaki