Mitsubishi Chemical Corporation

Hiroyuki Kaneko

Hiroshi Nakano

Takayuki Aoshima

Tomohide Yoshida

Toyomasa Hoshino

Toshiyuki Hamano

Shinichiro Matsuzono

Tarou Amano

Tadashi Ueda

Atsushi Kusuno

Masanobu Miwa

An object of the present invention is to provide a resin composition improved in film formability and/or mechanical property, particularly tensile elastic modulus or tearing strength, of the film. The present invention provides a resin composition including at least (A) an aliphatic polyester-based resin and (C) a starch, the aliphatic polyester-based resin (A) forming a matrix phase and the starch (C) forming a dispersed phase, wherein the average particle diameter of the dispersed phase is 1 &#x3bc;m or less.

Resin composition, film, bag product and production process of resin composition

A method of producing an aliphatic polyester resin by continuously esterifying and melt polycondensing an aliphatic dicarboxylic acid and an aliphatic diol; and at least one aliphatic hydroxycarboxylic acid; and at least one of an aliphatic unsaturated dicarboxylic acid and cis- and trans-isomers of aliphatic unsaturated tricarboxylic acids, wherein the total amount of the at least one aliphatic hydroxycarboxylic acid and the at least one of aliphatic unsaturated dicarboxylic acid and cis- and trans-isomers of aliphatic unsaturated tricarboxylic acids is from 0.0010 to 0.50 mol % of the total amount of the aliphatic polyester resin; and the total amount of the at least one aliphatic hydroxycarboxylic acid is from 1.0 to 7.0 in terms of a molar ratio to the total amount of the at least one of aliphatic unsaturated dicarboxylic acid and cis- and trans-isomers of aliphatic unsaturated tricarboxylic acids.

Aliphatic polyester resin and its production method

The present invention relates to a polyester resin composition comprising: (A) a polyester resin containing 5% by mole or more and not more than 86% by mole of a succinic acid unit in the whole of an aliphatic dicarboxylic acid unit; (B) a polyester resin containing 5% by mole or more and not more than 95% by mole of an aromatic dicarboxylic acid unit in all of dicarboxylic acid units; and (C) a polyester resin containing an aliphatic oxycarboxylic acid, wherein the polyester resin composition contains from 10 to 89% by weight of the resin (A) and from 11 to 90% by weight of the resin (B) relative to a total sum of the resins (A) and (B) and contains from 1 to 40% by weight of the resin (C) relative to a total sum of the resins (A), (B) and (C).

Polyester resin composition

An aliphatic polyester resin having excellent moldability and its production method are provided. When the amount of specific structural units contained in an aliphatic polyester resin is adjusted to an optimum amount, an aliphatic polyester resin having sufficient melt tension at the time of molding and excellent moldability than in the past and its production method is provided.

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Mie, Japan

Hiroyuki Kaneko