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1. US20080200639 - Unstable terminal group decomposer, and stabilized polyacetal resin, manufacturing method, composition and molded article using the same

Office United States of America
Application Number 11886153
Application Date 07.03.2006
Publication Number 20080200639
Publication Date 21.08.2008
Grant Number 07928184
Grant Date 19.04.2011
Publication Kind B2
IPC
C08C 1/14
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
CTREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
1Treatment of rubber latex
14Coagulation
C08G 69/00
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
69Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
Applicants Polyplastics Co., Ltd.
Inventors Harashina Hatsuhiko
Nakao Hiroaki
Agents Nixon & Vanderhye P.C.
Title
(EN) Unstable terminal group decomposer, and stabilized polyacetal resin, manufacturing method, composition and molded article using the same
Abstract
(EN)

The present invention provides a method of manufacturing a stabilized polyacetal resin, comprising the step of applying a heat treatment to a polyacetal resin having an unstable terminal group in the presence of an unstable terminal group decomposer selected from the following Group I, Group II and Group III, thereby decreasing the unstable terminal group:

    • unstable terminal group decomposer of Group I:
      • (I) a quaternary ammonium salt of an acidic cyclic amide compound,
    • unstable terminal group decomposer of Group II:
      • (II) a quaternary ammonium salt of a polycarboxylic acid intramolecularly having four or more carboxyl groups and/or a quaternary ammonium salt of an aminocarboxylic acid intramolecularly having one or more carboxyl group(s),
    • unstable terminal group decomposer of Group III:
      • (III) a quaternary ammonium salt, wherein a compound providing a counter-anion of a quaternary ammonium salt is at least one selected from the group consisting of the following (i) to (v):
      • (i) a carbonic acid monoester and/or a metal bicarbonate,
      • (ii) an acidic enol-based compound,
      • (iii) a phenol-based and/or an alcohol-based compound,
      • (iv) an acidic azole-based compound, and
      • (v) at least one non-carboxylic acid-based compound selected from the group consisting of an organic sulfur compound, an organic phosphorus compound and an organic boron compound.

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