Treating agent for decomposing unstable terminal group, stabilized polyacetal resin produced with the same, production process, composition, and molded object

A polyacetal resin and terminal group technology, applied in the fields of unstable terminal group decomposition treatment agents, stabilized polyacetal resins using the same, manufacturing, compositions and moldings, can solve environmental problems, Thermal instability, reduced residual amount of end groups, etc.

Active Publication Date: 2008-03-12
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of the molecular ends of the obtained polyacetal resin are hemiacetal groups or formyl groups, which are unstable to heat, and formaldehyde is generated by thermal decomposition during molding. Oxidation into formic acid causes the following problems: decomposition of polyacetal resin, foaming of molded products, and occurrence of silver streaks due to outgassing
[0020] However, there is no description in this technique except for the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0256] The present invention will be described below by way of examples, but the present invention is not limited by these examples.

[0257] Hereinafter, the cases of using the quaternary ammonium salt of (I), the quaternary ammonium salt of (II), and the quaternary ammonium salt of (III) are divided into cases, and further, for each case, it is divided into examples of production and comparison of stabilized polyacetal resins. Production examples, examples and comparative examples of compositions using stabilized polyacetal resins and molded articles thereof will be described.

[0258] Example using the quaternary ammonium salt of (I)

[0259] (1) Implementation and Comparative Production Examples of Stabilized Polyacetal Resin (Copolymer)

[0260] [Preparation of Crude Polyacetal Copolymer (A) for Stabilization Treatment]

[0261] Use a cylinder with a partially overlapping cross-sectional shape of two circles, a jacket with a hot (cold) medium passing through the outside...

Embodiment manufacture example 1-1～7

[0265] 0.3 parts by weight of triethylene glycol [3-(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], and 2 parts by weight of an aqueous solution of a quaternary ammonium salt of the following acidic cyclic amide compound adjusted to a predetermined concentration as a decomposition treatment agent (in terms of quaternary ammonium nitrogen, with respect to 1 kg of crude polyacetal copolymer, the addition of the quaternary ammonium salt rate of 1.4mmol) and uniformly mixed.

[0266] Then, the mixture was supplied to a twin-screw extruder (diameter 30mm) provided with one exhaust port, under an exhaust vacuum degree of 2.7kPa (20mmHg), a barrel temperature of 200°C, and an average residence time of 300 seconds. , the volatile matter is removed from the (exhaust port) degassing port, and melt kneading simultaneously to obtain a pellet-like stabilized polyacetal copolymer (implementation of manufacturing example 1-1 (a-1) to implementation of manufacturing example 1-7 (a-7)). ...

Embodiment manufacture example 1-8

[0277] 0.3 parts by weight of triethylene glycol [3-(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], and 2 parts by weight of an aqueous solution of the quaternary ammonium salt (A-1) of the above-mentioned acidic cyclic amide compound adjusted to a predetermined concentration as a decomposition treatment agent (in terms of quaternary ammonium nitrogen, with respect to every 1 kg of crude polyacetal copolymer, quaternary Ammonium salt was added at a rate of 0.7 mmol) and mixed uniformly.

[0278] Next, it melt-kneaded with the twin-screw extruder similarly to the above-mentioned production example, and obtained the pellet form stabilized polyacetal copolymer (a-8).

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Abstract

A process for producing a stabilized polyacetal resin which comprises heating a polyacetal resin having unstable terminal groups in the presence of a treating agent for unstable-terminal-group decomposition selected from the following groups (I), (II), and (III) to thereby diminish the unstable terminal groups. Treating agents for unstable-terminal-group decomposition in group (I) Group (I): quaternary ammonium salts of acid cyclic amide compounds Treating agents for unstable-terminal-group decomposition in group (II) Group (II): quaternary ammonium salts of polycarboxylic acids having four or more carboxy groups per molecule and/or quaternary ammonium salts of aminocarboxylic acids having one or more carboxy groups per molecule Treating agents for unstable-terminal-group decomposition in group (III) Group (III): quaternary ammonium salts in which the counter anions are ones derived from at least one compound selected from the group consisting of the following (i) to (v): (i) carbonic acid monoesters and/or metal hydrogen carbonates; (ii) acid enol compounds; (iii) phenolic compounds and alcoholic compounds; (iv) acid azole compounds; and (v) at least one noncarboxylic acid compound selected from the group consisting of organosulfur compounds, organophosphorus compounds, and organoboron compounds.

Description

technical field [0001] The present invention relates to an unstable terminal group decomposition treatment agent of a specific quaternary ammonium salt, a method for producing a stabilized polyacetal resin with a reduced unstable terminal group by heat treatment in the presence of the decomposition treatment agent, and the obtained stable polyacetal resin. Polyacetal resin, its composition and molding. Background technique [0002] Polyacetal resin has an excellent balance of mechanical properties, chemical resistance, sliding properties, etc., and is easy to process. As a representative engineering plastic, it is mainly used for electrical and electronic parts, automobile parts, and other various mechanical parts. is widely used. [0003] There are homopolymers and copolymers in polyacetal resins. The former uses formaldehyde or its cyclic polymers as raw materials, and the latter uses formaldehyde or its cyclic polymers as the main monomer to form cyclic esters and / or cyc...

Claims

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Application Information

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IPC IPC(8): C08G2/30C08K5/00C08J5/00C08L59/00C08K3/22
Inventor 原科初彦中尾弘明
Owner POLYPLASTICS CO LTD
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