METHOD OF PREPARING THERMOPLASTIC RUBBER COMPOSITION Russian patent published in 1998 - IPC

FIELD: industrial rubber industry. SUBSTANCE: claimed method is carried out in two stages: in first stage, carboxy containing butadiene-nitrile rubber latex is mixed with plastic latex based on copolymer comprising 20.0-27.3 wt % acrylonitrile units; 23.0-31.0 wt % butadiene units and 48.0-52.0 wt % styrene (methyls styrene) units, and with amine or phenol type antioxidant in 1-10:1:0.02-0.30 ratio by dry matter, respectively. Polymeric mixture is isolated from latex and dehydrated. In second stage, divalent metal oxide or hydroxide selected from group consisting of zinc, magnesium , calcium, plasticizer and further butadiene (isoprene) styrene thermoplastic material with melt index of 4-14 g/10 min, is added to polymeric mixture on rolls or in rubber mixer at 80-130 C at 190 C in amount of 1-10 wt parts per 100 wt parts of polymeric mixture. In second stage, amine antioxidant is further added, in amount of 0.5-3.0 wt parts per 100 wt parts of polymeric mixture. Carboxy-containing butadiene-nitrile rubber includes copolymer comprising 14-30 wt % acrylonitrile units; 10- 30 wt % styrene units; 48-54 wt butadiene units; and 2-10 methacrylic acid units. EFFECT: simplified technology for preparing thermoplastic rubber composition and improved casting properties thereof. 3 cl, 3 tbl