Crosslinkable graft polymer dispersion of organopolysiloxanes containing hydrogen-siloxane groups and Si-vinyl groups
AssigneeBayer Aktiengesellschaft
InventorsHeinrich Alberts, Helmut Steinberger
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Abstract
A graft copolymer dispersion is produced by polymerizing a mixture comprising by weight approximately (a) 1 to 99% of an organopolysiloxane mass containing Si-H groups and vinyl groups, and (b) 99 to 1% of a polymerizable vinyl monomer. Polymerization initiators and/or molecular weight controllers may also be present. The product is not crosslinked as produced but can be blended with a crosslinking agent, applied to a textile as a coating and the crosslinked.
Claims12
A process for producing a stable graft polymer dispersion comprising polymerizing a mixture comprising by weight approximately
- (a) 1 to 99% of an organopolysiloxane mass containing Si-H groups and Si-vinyl groups, and
- (b) 99 to 1% of a polymerizable vinyl monomer.
A process for producing a stable graft polymer dispersion comprising polymerizing in the presence of a free radical initiator a mixture comprising
- (a) 1 to 99% of a mixture of at least two different organopolysiloxanes, and
- (b) 99 to 1% of a polymerizable vinyl monomer selected from the group consisting of an olefin, a vinyl ester of an aliphatic or aromatic acid, an .alpha.,.beta.-unsaturated monocarboxylic or dicarboxylic acid or an ester, amide, nitrile, anhydride or fluoro-substitution product thereof, a vinyl aromatic, vinyl chloride, vinylidene chloride, vinylidene fluoride, tetrafluoroethylene, perfluoropropylene, an N-alkenoyl-perfluorosulphonamide, a vinyl ether, allyl alcohol, allyl acetate, isobutene diacetate, 2-methylenepropene-1,3-diol, allylethyl carbonate and allylphenyl carbonate,
- (c) being made up of about 5 to 85% of an Si-H containing polymethylhydrogensiloxane of the formula ##STR6## wherein a denotes an integer between 0 and 120,
- b denotes an integer between 0 and 140 and
- X denotes a methyl group or hydrogen,
- and about 95 to 15% of an Si-vinyl containing polysiloxane of the formula ##STR7## wherein R.sup.1 is so chosen from alkyl radicals having 1 to 24 carbon atoms, aryl radicals, vinyl radicals and fluoroalkyl radicals having 1 to 24 carbon atoms that the polymer contains 0.0002 to 3% by weight of vinyl groups and
- c has a value which is such that the viscosity of the polymer varies between 100 and 1,000,000 mPa at 25.degree. C.
Dependencies are inferred from the claim text.