PROCESS FOR PRODUCING POLYHYDROXY POLYESTER

WIPO Patent Application WO/2010/041509

A1

A process for producing a polyhydroxy polyester which, when molded into a molded object, can be inhibited from causing the molding failure which occurs due to carbon dioxide generation attributable to terminal carboxy groups.  The process needs no by-product removal step and hence needs none of a solvent, a recovery device, and the like.  The process can efficiently yield the polyester while attaining a reduction in environmental burden.  In particular, a linear polyester as a by-product is used to form a radial polyhydroxy polyester, whereby the by-product is effectively utilized.  The polyhydroxy polyester is hence produced in satisfactory yield.  A nucleus-forming polyhydroxy compound having two or more hydroxy groups and an oxy acid are used to grow a polyester and thereby obtain a polyhydroxy polyester and, as a by-product, a linear polyester having a carboxy group at an end.  A carboxy-blocking agent is then added to the reaction system to bond the carboxy-blocking agent to the terminal carboxy group of the linear polyester.

WO/2005/015309	ALKALI-DEVELOPABLE RADIATION CURABLE COMPOSITION
JP6621237	Process for preparing polymer products with 2,5-flange carboxylate moieties within polymer backbones used in bottle, film or textile applications
JP3278914	POLYETHYLENE NAPHTHALATE COMPOSITION AND ITS PRODUCTION

INOUE KAZUHIKO (JP)
SHIMURA MIDORI (JP)

PCT/JP2009/063719

April 15, 2010

August 03, 2009

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NEC CORP (JP)
INOUE KAZUHIKO (JP)
SHIMURA MIDORI (JP)

C08G63/78; C08G63/91

JPH08100057A	1996-04-16
JP2007126653A	2007-05-24
JP2008094887A	2008-04-24

MIYAZAKI, Teruo et al. (JP)
Akio Miyazaki (JP)

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