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US 2019/0135985 A1Published application
Polyoxymethylene and Siloxane Block Copolymers and Process For Making Same
AssigneeCelanese Sales Germany GmbH
InventorAndré Hebel
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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.
Claims24
A polyoxymethylene-polydimethylsiloxane block copolymer comprising a polymer having the following formula:
- wherein n is from about 5 to about 1500, m is from 2 to 10, p is from 5 to 500, and wherein
- and wherein y is from about 5 to about 50;
- or
- wherein n is from about 5 to about 1500, m is from 2 to 10, p is from 5 to 500, and wherein
- and wherein y is from about 5 to about 50.
2 more elements
A process for producing a polyoxymethylene and siloxane block copolymer comprising:
- combining a first monomer that forms —CH2—O— units with a second monomer comprising a siloxane including carbinol groups or ethylene oxide groups;
- and
- polymerizing the first monomer with the second monomer to form a polyoxymethylene-siloxane block copolymer.
Dependencies are inferred from the claim text.