Thermally stable polyoxymethylene copolymer

Details Thermally stable polyoxymethylene copolymer Thermally stable polyoxymethylene copolymer

1997-02-24

1998-11-17

Truong, Duc

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528232, 528240, 528241, C08L 6102, C08G 400, C08G 600

Patent

active

058377816

ABSTRACT:
A polyoxymethylene copolymer prepared by copolymerizing a mixture comprising trioxane and 1,3-dioxolane in the presence of at least one polymerization catalyst selected from the group consisting of boron trifluoride, a boron trifluoride hydrate and a coordination complex compound of an organic compound containing an oxygen atom or a sulfur atom with boron trifluoride, wherein the 1,3-dioxolane has a 2-methyl-1,3-dioxolane content of not more than 500 ppm by weight and a 1,3-dioxolane peroxide content of not more than 15 ppm by weight in terms of hydrogen peroxide, and contains at least one hindered phenol in an amount of from 10 to 500 ppm by weight, each based on the weight of the 1,3-dioxolane.

REFERENCES:
patent: 4579935 (1986-04-01), Kasuga et al.

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