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US 4,070,526 AGranted
Radiation-curable coating compositions comprising mercaptoalkyl silicone and vinyl monomer, method of coating therewith and coated article
AssigneeDow Corning Corporation
InventorsJoseph A. Colquhoun, Robert E. Kalinowski
Life of this patent
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Abstract
Fluid compositions are disclosed which are useful as coatings on solid substrates. The compositions comprise a mercaptoalkyl-substituted polydiorganosiloxane fluid and a vinyl monomer. The compositions may further comprise a methylvinylpolysiloxane and/or a photosensitizing compound. The compositions, applied and cured on a substrate such as paper, provide improved release of adhesive materials.
Claims18
A radiation-curable composition consisting essentially of a mixture of
- A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25.degree. C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH.sub.2).sub.n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms or phenyl,
- B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being from none to an amount sufficient to provide up to 10.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition, and from about 1 to 50 parts by weight for every 100 parts by weight of (A) of
- C. a vinylic monomer.
A method for treating a solid substrate to improve the release of adhesive materials therefrom, said method comprising
- I. applying to the solid substrate a composition obtained by mixing components consisting essentially of
- A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25.degree. C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH.sub.2).sub.n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms and phenyl,
- B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being from none to an amount sufficient to provide up to 10.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition, and from about 1 to 50 parts by weight for every 100 parts by weight of (A) of
- C. a vinylic monomer,
- Ii. exposing the applied composition to energetic radiation, and
- Iii. recovering an article comprising the solid substrate having adhered thereto a cured polydiorganosiloxane that will provide controllably variable release of adhesives therefrom.
3 more elements
Dependencies are inferred from the claim text.