Toray Industries, Inc.

Tatsuya Nagano

Hiroyuki Ome

Katsushige Yamada

Kenji Sawai

Kenji Kawamura

Hideki Sawai

Takashi Mimitsuka

Shin-ichi Minegishi

Izumi Nakagawa

Bo Yu

Masateru Ito

Xiao Ping Guo

Yong Gen He

Masatoshi Aoyama

Yoshitake Takahashi

Keisuke Honda

Kunihiro Morimoto

Tsuyoshi Tanaka

Pujing Zuo

Tomoko Nasuno

Kexin Zhu

Ito Masateru

Minoru Fujimori

Shin-Ichi Minegishi

Yong He

Lactic acid is obtained by a method including (A) a step of continuous fermentation wherein a fermentation culture medium of a microorganism having an ability of lactic acid fermentation is filtered through a porous membrane having an average pore size of not less than 0.01 &#x3bc;m and less than 1 &#x3bc;m with a transmembrane pressure difference within the range of 0.1 to 20 kPa, and the permeate is collected, while retaining the non-permeated liquid in or returning the non-permeated liquid to the culture, and adding a fermentation feedstock to the culture; (B) a step of filtering the permeate obtained in Step (A) through a nanofiltration membrane; and (C) a step of distilling the permeate obtained in Step (B) under a pressure of not less than 1 Pa and not more than atmospheric pressure, at 25&#xb0; C. to 200&#xb0; C. to recover lactic acid.

Method for producing lactic acid and method for producing polylactic acid

Provided is a method of recovering gaseous hydrocarbons and/or liquid hydrocarbons from underground, characterized by using a polylactic acid) resin comprising an a poly-L-lactic acid component and a poly-D-lactic acid component and having a heat of fusion at 190&#xb0; C. or higher, as measured by differential scanning calorimetry, of 20 J/g or more, wherein the underground is at a depth of 3,000 m or deeper. According to the recovery method of the present invention, shale gas, shale oil, and the like can be recovered efficiently.

Method for recovery of gaseous hydrocarbons and/or liquid hydrocarbons from underground

A method of producing a poly(lactic acid) resin includes carrying out direct polycondensation using lactic acid as a main raw material to prepare a crystallized prepolymer having a weight average molecular weight of 5,000 to 25,000, an enthalpy of fusion &#x394;Hm of 50 to 65 J/g and an acid value A mol/ton satisfying (1) below:450/(Mw/10,000&#x2212;0.14)&#x3c;&#x3c;950/(Mw/10,000&#x2212;0.14)&#x2003;&#x2003;(1)(wherein Mw represents weight average molecular weight of the crystallized prepolymer); and subjecting the crystallized prepolymer to solid-phase polymerization.

Process for production of poly(lactic acid)-type resin, and poly(lactic acid)-type prepolymer

A method for producing an aliphatic polyester resin including a melt polymerization step and a subsequent solid phase polymerization step, using a sulfonic acid group-containing compound as a catalyst, wherein the addition amount of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a raw material monomer calculated as sulfur atoms, the content of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a produced polymer calculated as sulfer atoms, and a residual rate of the sulfonic acid group-containing compound after solid phase at polymerization is more than 50.

Method for producing aliphatic polyester resin, and an aliphatic polyester resin composition

In a polyester production method, a titanium compound having a radical selected from a carbonyl group, a carboxyl group, or an ester group, and a phosphorous compound having a structure illustrated in Formula (I), are added  This yields a polyester composition which does not exhibit increased filter pressure when forming, which has excellent filament and film forming properties, and which has a polymer color tone superb to that of conventional products.

Polyester production method, polyester composition, and polyester fiber

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Nagoya, Japan

Tatsuya Nagano