RUBBER MIXTURE Russian patent published in 2019 - IPC C08L9/02 C08L31/04 E21B33/12 C09K3/10 C08K3/11 C08K3/13 C08K3/14 C08K3/22 C08K3/28 C08K5/09 C08K5/40 

FIELD: technological processes.

SUBSTANCE: invention relates to rubber industry and can be used for external layer of sealing elements in water-swellable packers used in oil and gas industry. Rubber mixture contains butadiene-nitrile rubber with nitrile of acrylic acid content of 17–20 %, isoprene rubber SKI-3, ethylene-propylene rubber SKEPT-40, sevylene 11808-340, sulfur, 2,2'-dibenzothiazole disulphide, guanide F, zinc white, stearic acid, acetonanil H, technical carbon P 514, rosil 175, talc, finely powdered mineral powder of schungite, rosin, needle-punched fabric "Oxipan", polyacrylamide AK 639, sodium polyacrylate and reagent "Cometa-R".

EFFECT: improved index of relative elongation at break of rubber and increased degree of its volumetric swelling in water.

1 cl, 2 tbl