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US 2021/0230372 A1Published application
Polysiloxane resin-polyolefin copolymer and methods for the preparation and use thereof
AssigneeDow Silicones Corporation
InventorsSteven Swier, John Horstman
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Abstract
A polysiloxane resin—polyolefin copolymer may be prepared using either a hydrosilylation catalyst or a Lewis Acid catalyst. The copolymer may have polyorganosilicate or silsesquioxane resin blocks. The copolymer may have polyethylene or poly(ethylene/octene) blocks.
Claims26
A method for preparing a polysiloxane resin—polyolefin copolymer comprising:
- 1) combining starting materials comprising:
- A) a polyolefin having a silicon bonded hydrogen functional group of formula
- where each R1 is an independently selected monovalent hydrocarbon group and subscript a is 1 or 2;
- B) a polysiloxane resin having, per molecule, at least one silicon bonded group reactive with silicon bonded hydrogen of starting material A);
- and
- C) a catalyst.
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A polysiloxane resin—polyolefin copolymer comprising:
- I) a polyolefin block,
- II) a polysiloxane resin block, and
- III) a divalent linking group comprising a first silicon atom and a first oxygen atom, where the first silicon atom in the linking group is bonded to a carbon atom in the polyolefin block and the first oxygen atom in the linking group is bonded to a silicon atom in the polysiloxane resin block.
- the linking group has formula
- where subscript a is 1 or 2, R1 is a monovalent hydrocarbon group, R24 is a monovalent hydrocarbon group or a hydrolyzable group, with the proviso that at least some instances of R4 are monovalent hydrocarbon groups, RL is a divalent hydrocarbon group, and subscript S is 0, 1, or 2.
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A polysiloxane resin—polyolefin copolymer comprising:
- A) a polyolefin block of unit formula
- where each R25 is independently selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon group of 1 to 18 carbon atoms, and a monovalent halogenated hydrocarbon group of 1 to 18 carbon atoms, each D1 is independently a divalent hydrocarbon group, and subscripts M and N have values such that M≥1 and N≥1;
- B) a polysiloxane resin block comprising units of formula (R243SiO1/2)W(R242SiO2/2)X(R24SiO3/2)Y(SiO4/2)Z, where each R24 is independently selected from the group consisting of a monovalent hydrocarbon group of 1 to 30 carbon atoms, a hydrolyzable group, and an aliphatically unsaturated group;
- subscripts W, X, Y, and Z have values such that W≥0, X≥0, and (Y+Z)>0;
- C) a linking group comprising a silicon atom and an oxygen atom, where the silicon atom in the linking group is bonded to D1 in the polyolefin block and the oxygen atom in the linking group is bonded to a silicon atom in the polysiloxane resin block, where the linking group has formula
- where subscript a is 1 or 2, each R1 is an independently selected monovalent hydrocarbon group, RL is a divalent hydrocarbon group, subscript S is 0, 1, or 2.
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Dependencies are inferred from the claim text.