Patent ID: 6548584
Filing Date: 2003-04-15
Classification: C08J

Abstract:
A process for the production of finely divided, pulverulent rubber powder containing filler, comprising:a) mixing &gE;50 wt. % of a filler with: (i) 0.1 to 6.5 parts by weight of water-soluble salts per 100 parts by weight of rubber, and (ii) a rubber latex or an aqueous emulsion of a rubber solution, b) reducing the pH value of the mixture formed in step a) to a value in the range from 5.5 to 4.5, c) adding the remainder of the filler as a filler suspension, and d) reducing the pH value to approximately 3.2 causing the precipitation of the rubber and the filler, wherein the filler suspension comprises water-soluble salts of a metal selected from group IIa, IIb, IIIa or VIII of the periodic table of elements.