Nisshinbo Industries, Inc.

Hirotaka Iida

Ikuo Takahashi

Norimasa Nakamura

Yasushi Takagi

Yuichi Yanai

Masayoshi Oba

Takeo Ishikawa

Kazuhiko Harada

Kiyoshi Ikeda

Takayuki Hirai

Tsuyoshi Takeuchi

Yoshihiro Yamazaki

Osamu Hasegawa

Kazuhiko Arakawa

Ken-ichi Yanagisawa

Ryuichi Ito

Masazumi Ii

Yuzo Nakamura

Provided are: a biodegradable plastics composition which controls a biodegradation rate with a synergistic controlling effect on three components, adjusts a hydrolysis rate, and shows significantly improved weatherability; a molded article of the composition; and a method of controlling the biodegradation rate of a biodegradable plastics. The biodegradable plastics composition includes: a biodegradable plastics; and a carbodiimide compound, an ultraviolet ray absorbent, and an antioxidant to be blended as essential ingredients into the biodegradable plastics, and the molded article of the composition is also provided.

Biodegradable plastics composition, molded article of the composition, and method of controlling biodegradation rate

A carbodiimide composition having an improved heat resistance which meets conventional requirements for a carbodiimide compound to be compounded in an ester-group-containing resin or a biodegradable plastic, and exhibiting no coloring problems due to yellowing, and having a superior stabilizing effect agains hydrolysis. The carbodiimide composition comprises a carbodiimide compound (A) and an antioxidant (B), having a 5% weight loss temperature not lower than 250&#xb0; C. as determined by a thermogravimetric (TG) method, wherein an antioxidant (B) is dispersed and present in the composition by admixing during synthesis of a carbodiimide compound (A), a stabilizer against hydrolysis mainly comprising the carbodiimide composition and a thermoplastic resin composition containing the same.

Carbodiimide composition with suppressed yellowing, a stabilizer against hydrolysis and a thermoplastic resin composition

A biodegradable plastic composition which can be stably adjusted in biodegradation rate, and has greatly improved resistance to hydrolysis and weather, in particular the former, and durability resulting from the improved resistances; a molded article thereof; and a method for controlling biodegradation rate using the same composition. The biodegradable plastic composition comprising (A) 100 parts by weight of biodegradable plastic, (B) 0.01 to 10 parts by weight of a carbodiimide compound and (C) 0.01 to 10 parts by weight of at least one compound selected from the group consisting of benzotriazole-, triazine- and hydroxylamine-based compounds; the molded article thereof; and the method for controlling biodegradation rate using the same composition.

Aliphatic polyester composition, a molded article thereof and a method for controlling biodegradation rate using the same composition

A stabilizer against hydrolysis, which can solve conventional problems of a carbodiimide compound compounded in an ester-group-containing resin or a biodegradable plastic as a stabilizer against hydrolysis, such as poor heat resistance and a coloring problem due to yellowing, and can provide enhanced resistance against hydrolysis, and a thermoplastic resin composition of an ester-group-containing resin or a biodegradable plastic containing the same. Specifically, that the stabilizer against hydrolysis includes a carbodiimide composition comprising an aliphatic carbodiimide compound (A) and a phosphorus antioxidant (B), preferably the stabilizer contains a carbodiimide composition wherein a phosphorus antioxidant (B) is dispersed and present in the carbodiimide composition by admixing the phosphorus antioxidant (B) during synthesis of the aliphatic carbodiimide compound (A), and a thermoplastic resin composition having a superior stability against hydrolysis, characterized in that said stabilizer against hydrolysis is compounded in an easily hydrolysable resin (C).

Stabilizer against hydrolysis for an ester-group-containing resin and a thermoplastic resin composition

A fiber article having excellent hydrolysis resistance, characterized in that the article is fiber structure composed of 10 to 90% by weight of a fiber (A) comprised of a biodegradable plastic formulated with a carbodiimide compound as a stabilizer against hydrolysis and 90 to 10% by weight of at least one fiber (B) selected from a natural fiber, a regenerated fiber, a semi-synthetic fiber and a synthetic fiber, which fiber structure has been subjected to at least one treatment processing selected from scouring processing, bleaching processing, liquid ammonium processing, mercerization processing, biological processing, dyeing processing, or resin treatment, and concentration of total terminal carboxyl groups derived from the fiber (A) in said fiber article is not higher than 30 equivalents/ton based on the fiber (A), etc. It is an object of the present invention to solve conventional problems of a fiber or a fiber article comprising a biodegradable plastic, such as poor hydrolysis resistance, poor heat resistance, strength reduction and coloring by yellowing, and in particular to provide a fiber article superior in hydrolysis resistance, alkali resistance and dyeing resistance.

Fiber article comprising a biodegradable plastic

A biodegradable plastic composition enabling to stably adjust biodegradation rate, improve hydrolysis resistance and heat resistance, and retain transparency, molded articles thereof and a method for controlling biodegradation rate of the biodegradable plastic. In more detail, a biodegradable plastic composition, characterized in that said composition is made by compounding 100 parts by weight of a biodegradable plastic (A), in particular, an aliphatic type polyester with 0.01 to 5 parts by weight of a carbodiimide compound (B) and 0.01 to 3 parts by weight of an antioxidant (C), in particular, a hindered phenol type antioxidant with a molecular weight of not less than 400 alone or mixed antioxidants of said hindered phenol type antioxidant and a phosphite type antioxidant, a molded article thereof and a method for controlling biodegradation rate of the biodegradable plastic.

Biodegradable plastic composition, a molded article thereof and a method for controlling biodegradation rate

A method for shrink-proofing a cellulosic fiber textile that involves liquid ammonia treatment, hot water or alkali treatment under tension or under no tension, and with optional resin treatment.

Shrink-proof treatment of cellulosic fiber textile

Creases are formed in a cellulosic fiber textile by treating the fiber textile with liquid ammonia, creasing the fiber textile, and treating the fiber textile with hot water or alkaline solution substantially simultaneous with or subsequent to the creasing step. Fully durable creases are formed in the cellulosic fiber textile without detracting from strength.

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Chiba, Japan

Hirotaka Iida