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US 2019/0135986 A1Published application
Polyoxymethylene and Siloxane Copolymers and Process For Making Same
AssigneeCelanese Sales Germany GmbH
InventorsAndré Hebel, Nicolai Papke
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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.
Claims20
A polyoxymethylene polymer composition comprising a branched polyoxymethylene-polydimethylsiloxane copolymer having the following structure:
- III. or mixtures of I and II
- wherein m is from 2 to 40, n is from 5 to 2500, and o is from 1 to 150, and wherein Y has the following structure:
- and wherein l is from 1 to 100 and p is greater than m and is from 10 to 1,000.
A process for producing polyoxymethylene copolymers comprising:
- reacting a monomer comprising trioxane with a α,ω-epoxy terminated polydimethylsiloxane in the presence of an initiator, the initiator comprising an acid that is boron free to produce at least one polyoxymethylene copolymer containing polydimethylsiloxane units.
Dependencies are inferred from the claim text.