Patent ID: 8304077

Claim:
Metallic effect pigments with a platelet-shaped metallic substrate, the metallic pigments comprising at least one metal oxide layer having a surface, wherein the surface of the metal oxide layer has covalently bonded thereto polysiloxane of the formula I: where R 1 is selected from the group consisting of a saturated or unsaturated, straight-chain or branched alkyl radical having 1 to 30 carbon atoms and an aryl radical, alkylaryl radical and arylalkyl radical having 6 to 30 carbon atoms; each of R 2 , R 3 , R 4 and R 5 independently of one another is selected from the group consisting of saturated or unsaturated, straight-chain or branched alkyl radicals having 1 to 6 carbon atoms and aryl radicals, alkylaryl radicals and arylalkyl radicals having 6 to 12 carbon atoms; x=1 to 200, y=2 to 30; A is (CH 2 ) n , O, S, (OCH 2 CH 2 ) m or C 6 R 6 4 , where n=0 or 1 and m=0 to 30 and R 6 is selected from the group consisting of H and alkyl having 1 to 6 carbon atoms; B is (CH 2 ) z or (OCH 2 CH 2 ) w , z=0 or 30 and w=0 to 30; and R 7 and R 8 independently of one another are selected from the group consisting of O, a saturated or unsaturated, straight-chain or branched alkyl radical having 1 to 6 carbon atoms, an aryl radical, alkylaryl radical and arylalkyl radical having 6 to 9 carbon atoms, where X is O or OH and is attached to the pigment surface.