Abstract: Long chain branched polyoxymethylene-polydimethylsiloxane copolymers are described. The copolymers have excellent impact properties, shear thinning and slip wear properties in comparison to a polyoxymethylene polymer not containing polydimethylsiloxane groups.

Abstract: Polyoxymethylene-polydimethysiloxane block copolymers are disclosed. In one embodiment, the siloxane monomer used to make the polymer is soluble in the polyoxymethylene monomers, namely trioxane. The polymer can be formed having relatively small particle sizes, such as less than about 350 microns, such as less than about 200 microns, which makes the polymer well suited for powder coating applications.

Abstract: A polyoxymethylene polymer is disclosed that contains long-chain alkylene glycol end groups. The polyoxymethylene polymer may be formed by using a Bis-oligo-alkylene glycol-formal as a chain transfer agent during production of the polymer. The end groups on the polyoxymethylene polymer may comprise ethylene oxide end groups and/or propylene oxide end groups. The resulting polymer has excellent flow characteristics and may be used as a flow additive for other thermoplastic polymers. Alternatively, the polymer may be used to form various molded articles with excellent tribological properties.

Abstract: A polyoxymethylene polymer is disclosed that contains long-chain alkyl end groups. The polyoxymethylene polymer may be formed by using a Bis-alkylformal as a chain transfer agent during production of the polymer. In one embodiment, the Bis-alkylformal is dissolved in a monomer, such as trioxane, during production of the polymer. In one embodiment, a branching agent may also be present with one or more monomers for producing a branched polyoxymethylene polymer. In this manner, greater amounts of alkyl end groups can be incorporated into the polymer. The resulting polymer has excellent flow characteristics. The polymer may be used to form various molded articles with excellent tribological properties.