LOW-EMISSION COLORED POLYOXYMETHYLENE MOLDING COMPOSITION
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United States of America Patent
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app pub date -
Jun 6, 2008
filing date -
Aug 6, 1999
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Abandoned
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Abstract
Colored molding compositions made from polyacetal copolymer, where the polyacetal copolymer essentially consists of oxymethylene units and oxyethylene units, and a strong protonic acid was used as initiator during preparation of the polyacetal copolymer, have lower formaldehyde emission than that from a comparable molding composition for which the polyacetal copolymer was prepared using a Lewis acid as initiator. The formaldehyde emission is generally less than 20 mg/kg, preferably less than 10 mg/kg.
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