A melamine free composite additive used in polyoxymethylene is provided. The composite additive includes an amine stabilizer and antioxidant. The composition of the amine stabilizer is 0.01 to 3 parts by weight per 100 parts by weight of the polyoxymethylene. The composition of the antioxidant is 0.05 to 3 parts by weight per 100 parts by weight of the polyoxymethylene. The composite additive enhances the light stability and thermal stability of the polyoxymethylene.

Melamine free composite additive for polyoxymethylene

PROBLEM TO BE SOLVED: To preserve molten trioxane in a good state by adding a specific hindered amine-based compound to the trioxane. SOLUTION: Trioxne is preserved by adding preferably 0.5-50 ppm of a hindered amine-based compound expressed by the formula (R1 is H or a 1-30C monovalent organic residue; R2 to R5 are each a 1-5C alkyl; n is >=1: R6 is a n-valent organic residue), [preferably bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate]. Further, a sterically hindered phenol-based compound, preferably triethylene glycol bis[3-(3-t-butyl-5- methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-t-butyl-4- hydoxyphenyl)propionate] are preferably added.

Method for preserving trioxane, oxymethylene copolymer obtained by polymerizing the trioxane and its production

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Method for preserving trioxane, oxymethylene copolymer obtained by polymerizing the trioxane and its production