THERMOPLASTIC COMPOSITION BASED ON SYNTHETIC CIS-1,4-ISOPRENE RUBBER AND POLYOLEFIN AND A METHOD OF ITS PREPARING Russian patent published in 1996 - IPC

FIELD: rubber and related branches of industry. SUBSTANCE: composition is prepared in the melt. Method involves mixing, mas. p.: rubber "СКИ-3" 75; low-pressure polypropylene 25; zinc oxide 3-5; stearic acid 1-2; sulfenamide 3-5; sulfur 0.2-0.6, and antioxidant 0.8-1.0. Rubber and antioxidant were mixed firstly followed by addition of zinc oxide, stearic acid, sulfenamide and sulfur to mixture. Then low-pressure polypropylene is added. Properties of composition before and after threefold processing: 10.6-17.5 MPa and 10.0-17.3 MPa; relative elongation - 375-580% and 380-575%; relative residual elongation - 72-95% and 70-96%; residual elongation after 100% stretching for 10 min and loading release - 23-28%. EFFECT: enhanced quality of composition. 11 ex, 3 cl, 1 tbl