Patent ID: 8921471
Filing Date: 2014-12-30
Classification: C08K

Abstract:
1. A method for reducing formaldehyde emission from a polymeric composition containing a polyacetal resin, the method comprising: heating and molding the polymeric composition to produce a molded polymeric article, the polymeric composition comprising a polyacetal resin combined with an aluminum pigment, the polyacetal resin having an initial formaldehyde content of from about 20 ppm to about 150 ppm, wherein the polyacetal resin further comprises hemiformal terminal groups in amounts greater than 1.5 mmol/kg, the aluminum pigment comprising elemental aluminum, the polymeric composition further comprising an unhindered phenol polymer, the aluminum pigment being present in the polymeric composition in an amount sufficient to reduce formaldehyde emission, the molded polymeric article exhibiting a formaldehyde emission pursuant to VDA 275 of from about 1 ppm to about 7 ppm.