Method of stabilizing polyoxymethylene copolymer
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Nov 13, 1987
filing date -
Nov 14, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method of stabilizing a polyoxymethylene copolymer, which comprises (1) heat-melting a crude copolymer of trioxane and a cyclic ether and/or a cyclic acetal to form a first stabilized copolymer having a decomposition ratio (D.sub.220.sup.60), determined when it is heated at 220.degree. C. for 60 minutes in vacuum, of up to 2% by weight, and then (2) bringing the first stabilized copolymer into contact with steam containing 0.01 to 5% by weight of a basic compound at a temperature of at least 100.degree. C. but not exceeding the melting point of the copolymer to form a second stabilized copolymer.
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