RUBBER COMPOUND Russian patent published in 2008 - IPC C08L21/00 C08K13/02 C08K3/24 

FIELD: rubber industry.

SUBSTANCE: invention is directed to preparation of rubber compounds based on general- and special-destination rubbers using naturally occurring wollastonite as filler and can be used in manufacture of technical-destination rubber goods, elastomeric compositions, polymeric rolled roofing and waterproof materials, and the like. Rubber compound is prepared by mixing general- or special-destination rubber, sulfur-containing vulcanization agent, extender: carbon black, zinc oxide, stearin. Functional additive is further added in the form of organosilane-modified wollastonite or wollastonite having needle structure with characteristic ratio from 10:1 to 20:1 and diameters of equivalent sphere D50=3-15 μm, D98=20-100 μm, D10=1-4 μm. Rubber compound may also contain 5 wt parts of paraffin-naphtene oil or 0.1 wt parts of stabilizer.

EFFECT: improved complex of technological and user's properties of rubber compound: strength, elasticity, and tear resistance.

14 tbl, 13 ex