POWDERED RUBBERS (COMPOUNDS) AND A METHOD FOR PREPARATION THEREOF Russian patent published in 2003 - IPC

FIELD: rubber industry. SUBSTANCE: invention relates to powdered rubbers containing other components to give curable rubber compounds. Fine rubber powder contains rubber matrix and, additionally, one or several white and/or black fillers optionally modified by one or several organosilicon compounds of formulas I, II or III: or R1n

(RO)_3-nSi-(alkenyl) (III),, in which B represents -SCN, -SH, -Cl, -NH₂ (when q= 1), or -S_x- (when q=2); R and R¹, the same or different, represent branched or unbranched C1-C4-alkyl group or phenyl, preferably alkyl group; n= 0,1, or 2; Alk represents bivalent linear or branched C1-C5-hydrocarbon residue; m= 0 or 1; Ar is C6-C12-alylene residue; p=0 or 1 provided that p and m cannot simultaneously represent 0; x=2-8; alkyl denotes monovalent linear or branched saturated hydrocarbon residue with 1-20 carbon atoms, preferably 2-8 carbon atoms; and alkenyl denotes monovalent linear or branched unsaturated hydrocarbon residue with 2-20 carbon atoms, preferably 2-8 carbon atoms. Rubber is supplemented by one or several known additives to give vulcanizate. Filler are added in two steps. Solid residue is separated by known ways, rinsed, and dried. EFFECT: increased flowability of rubber so facilitating its processing. 15 cl, 10 ex _