公开(公告)号：US20040171730A1

公开(公告)日：2004-09-02

申请号：US10733773

申请日：2003-12-12

Applicant: Polyplastics Co., Ltd.

Inventor： Hanlong Tsai ,  Hiroyuki Hase

IPC: C08K003/18 ,  C08K005/04

CPC classification number: C08K3/22 ,  C08L61/04

Abstract: The present invention relates to a polyoxymethylene composition that is excellent in heat stability and mold properties (mold release and mold cycle) and can be melt and held in a molding machine with the improved prevention of the resin from color change. The present invention provides the polyoxymethylene composition comprising: a polyoxymethylene; (a) 0.01-3.0% by weight (in the composition, hereinafter likewise) of a steric-hindered phenolic antioxidant; (b) 0.01-1.0% by weight of a compound selected from oxides or carboxylic acid salts of an alkali earth metal; and (c) 0.01-1.0% by weight of an ester of a polyhydric alcohol selected from propylene glycol, trimethylol propane and pentaerythritol and a higher fatty acid (C8-C29).

Abstract translation: 本发明涉及热稳定性和模具性能（脱模和模具循环）优异的聚甲醛组合物，并且可以将树脂熔化并保持在成型机中，从而改善树脂的颜色变化。 本发明提供了聚甲醛组合物，其包含：聚甲醛; （a）0.01-3.0重量％（在组合物中，下文同样）空间位阻酚类抗氧化剂; （b）0.01-1.0重量％的选自碱土金属的氧化物或羧酸盐的化合物; 和（c）0.01-1.0重量％的选自丙二醇，三羟甲基丙烷和季戊四醇的多元醇和高级脂肪酸（C8-C29）的酯。