Patent ID: 7649071

Claim:
A branched polysiloxane composition resulting from copolymerizing under hydrosilylation conditions a component mixture comprising: (a) one or more organosilicon compounds containing at least two unsaturated hydrocarbon functional groups per molecule, said unsaturated hydrocarbon functional groups capable of undergoing a hydrosilylation reaction with a silylhydride-containing compound under hydrosilylation conditions, provided that when said component (a) is a polysiloxane, it contains at least one D or T silicone unit that contains at least one unsaturated hydrocarbon functional group; and (b) one or more silylhydride-containing compounds containing at least two silylhydride functional groups per molecule; provided that (i) at least one component (a) or (b) contains at least three functional groups per molecule; (ii) one component (a) or (b) has a higher number of functional groups per molecule and is in a lower molar amount than another component (a) or (b) having a lower number of functional groups per molecule; and (iii) unsaturated hydrocarbon compounds are excluded from the component mixture.