Patent ID: 6822036
Filing Date: 2004-11-23
Classification: C08J,C08K,Y10T

Abstract:
A rubber powder, containing one or more oxidic or siliceous fillers, comprising at least one member selected from the group consisting of synthetic fillers in an amount of 400 phr to 5000 phr and naturally occurring fillers in an amount of 400 phr to 5000 phr; andcarbon black in an amount of 400 phr to 5000 phr, wherein the total amount of the fillers and carbon black does not exceed 5000 phr; wherein the surface of said oxidic or siliceous fillers is modified with one or more organosilicon compounds of the formulae: {R1n(RO)3-nSi-(Alk)m-(Ar)p}q{B1}â€ƒâ€ƒ(I), R1n(RO)3-nSi-(Alkyl)â€ƒâ€ƒ(II), or R1n(RO)3-nSi-(Alkenyl)â€ƒâ€ƒ(III), in which:B1: represents â€”SCN, â€”SH â€”Cl, NH2 (when q=1) or â€”Sxâ€” (when q=2), R: represents an alkyl group with 1 to 4 carbon atoms, branched or unbranched, or a phenyl group, wherein all the groups R, R1: represents a C1-C4-akyl or C1-C4-alkoxy group, branched or unbranched, or a phenyl group, wherein all the groups R1 may be identical or different, n: is 0, 1 or 2, Alk: represents a divalent straight or branched hydrocarbon group with 1 to 6 carbon atoms, m: is 0 or 1, Ar: represents an arylene group with 6 to 12 carbon atoms, p: is 0 or 1, with the proviso that p, m and n are not simultaneously 0, x: is a number from 2 to 8, Alkyl: represents a monovalent straight or branched saturated hydrocarbon group with 1 to 20 carbon atoms, Alkenyl: represents a monovalent straight or branched unsaturated hydrocarbon group with 2 to 20 carbon atoms, wherein said rubber powder is prepared by the addition of the fillers to latex in one step, wherein the fillers are added as a filler suspension with a suspension density of from 0.5% to 10% with respect to the fillers, and wherein said powder is coated with a layer of polystyrene, polystyrene/butadiene copolymers, polyethylenes or polypropylenes.