Thermal stabilization of acetal polymers

摘要

Stabilized acetal polymer molding compositions are formed by first preparing an intimate dispersion of cyanoguanidine or melamine in a carrier resin, e.g. a non-ionic carrier resin such as an ethylene/ethyl acrylate copolymer, and compounding the dispersion with the acetal polymer. The resulting composition is found in many cases to have improved thermal stability over compositions prepared by adding the cyanoguanidine or melamine as pure crystals.