COMPOSITION OF RUBBER MIXTURE FOR TYRE UNDERTREAD AND METHODS OF ITS APPLICATION Russian patent published in 2009 - IPC C08L21/00 C08K5/18 B29D30/54 C08J3/20 

FIELD: chemistry.

SUBSTANCE: invention relates to field of elastomer compositions, in particular to quickly hardened compositions of rubber mixtures, for rubber products, such as tyres, tyre breakers, hoses and tyre treads. Composition of rubber mixture contains diene caoutchouc, vulcanisation ultra-accelerator and from 3 to 10 phr (per 100 weight parts of caoutchouc by mass) the following compound: R1-NHphenyl-NH-R2, where amine fragments occupy 1^st and 4^th positions in phenyl cycle and R1 and R2 are selected from group including: H, C1-C3-alkyl groups with straight or branched chain, C4-C5-alkyl groups with straight or branched chain and C6-C15-alkyl groups with straight or branched chain, and where R1 and R2 can be similar or different; and where increased stability during storing is expressed in that value t₉₀ of time required for 90% completion of hardening, isothermal at 125°C, after 28 days of ageing at 40°C constitutes within the limit of 30% of isothermal t₉₀ value for unaged composition. Invention also includes method of tyre tread recovering using said composition as binding rubber mixture and method of tyre repair.

EFFECT: prevention of premature hardening of rubber mixture.

16 cl, 2 dwg, 7 tbl, 5 ex