Polyoxymethylene composition
AssigneePolyplastics Co., Ltd.
InventorsHanlong Tsai, Hiroyuki Hase
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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).
Claims4
A polyoxymethylene composition comprising 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 the group consisting of 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 the group consisting of propylene glycol, trimethylol propane and pentaerythritol with a higher fatty acid (C8-C29).
Dependencies are inferred from the claim text.