Thermal stabilization of acetal polymers
AssigneeCelanese Corporation
InventorsAndrew B. Auerbach, Tom C. Yu
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Abstract
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.
Claims11
A method of preparing a stabilized acetal polymer composition comprising forming an intimate dispersion of a stabilizer selected from the group consisting of cyanoguanidine and melamine in a carrier resin at a temperature above the softening point of said resins and compounding said dispersion with said acetal polymer, said carrier resin melting or softening at or below about 160.degree. C. and being inert to said acetal polymer as well as to the other additives present.
Dependencies are inferred from the claim text.