FIELD: rubber industry. SUBSTANCE: composition contains at least one microcapsulated additive, said additive being selected from curing chemicals and coated by coating material. The latter is not soluble in rubber or rubber compounds at temperatures 120-140 C and selected from group composed of waxes, paraffins, ethylene/vinyl acetate copolymer with particle size between 1 and 75 mcm. Additive composition contains 40 to 99% additive and 1 to 60% coating material. EFFECT: improved additive- rubber compatibility and distribution of additive in rubber material, increased stability of additive upon storage and during rubber processing at temperatures below about 130 C. 11 cl, 7 ex
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