METHOD OF PREPARING STABILIZER AND POLYISOPRENE COMPOSITION CONTAINING THEREOF Russian patent published in 2004 - IPC

FIELD: rubber industry. SUBSTANCE: alkylphenol is mixed and heated to 130-140 C with hexamethylenetetramine and N-isopropyl-N'-phenyl-pphenylenediamine at their weight ratio (4-10):1:(1-3) to give product with softening temperature 60-75 C. The product is supplemented by 1-7 wt parts of maleic anhydride per 1 wt part of hexamethylenetetramine and heating at 130-140 C is continued. Before addition of maleic anhydride, toluene may be added at 50-60 C to form 30-60% solution followed by heating at 50-90 C until process is completed. Polyisoprene composition includes isoprene rubber and 0.5-2% of above-described stabilizer. EFFECT: increased cohesive resistance of rubber compounds, increased 300%-elongation engineering stress leading to better workability of rubber. 2 cl, 1 tbl, 8 ex