Crosslinkable Silicone Compositions

Abstract

The invention relates to crosslinkable compositions (V) containing (A) linear organopolysiloxanes (A) having alkenyl groups,(B) linear organopolysiloxanes (B) which have diorganosilyloxy units and Si—H groups and are obtainable by a cohydrolysis process in which diorganodichlorosilanes and monochlorosilanes and optionally dichlorosilanes, at least the monochlorosilanes or dichlorosilanes containing Si—H groups, are hydrolyzed with water, and(C) catalysts (C) promoting the addition of Si—H groups at an aliphatic carbon-carbon double bond.

Description

Claims

1. A crosslinkable composition (V) containing (a) at least one alkenyl group-containing organopolysiloxane (A) of the formula 1

2. The crosslinkable composition of claim 1, wherein the linear organopolysiloxanes (B) have the formula 2 R33SiO(SiR32O)x(SiR12O)ySiR33   (2)whereinR3 is hydrogen or a C1-18 hydrocarbon radical optionally substituted by halogen or cyano radicals,R′ is a C1-18 hydrocarbon radical optionally substituted by halogen or cyano radicals,x is an integer from 0 to 1000 andy is an integer from 1 to 1000,with the proviso that at least one radical R3 is hydrogen.

3. The crosslinkable composition of claim 1, wherein organopolysiloxanes (B) have a viscosity of from 5 to 150 mPa·s at 25° C.

4. The crosslinkable composition of claim 1, wherein organopolysiloxanes (A) have an average viscosity of from 100 to 10,000 mPa·s at 25° C.

5. The crosslinkable composition of claim 1, wherein the radicals R″ are radicals having a terminal aliphatic carbon-carbon double bond with 2 to 10 carbon atoms.

6. A molding produced by crosslinking the composition (V) of claim 1.

7. The molding of claim 6, which is a coating.

8. The molding of claim 6, which is a covering repelling tacky substances.

9. A process for the production of coatings, comprising applying a crosslinkable composition (V) of claim 1 to a surface to be coated, and subsequently crosslinking the composition.