| 摘要 |
Vulcanized rubbery compositions are prepared by heating, at 200 DEG -400 DEG F. for 5 minutes to 3 hours, a copolymer of 70-99,5 parts by weight of an isoolefin having 4-7 carbon atoms and 30-0,5 parts by weight of an aliphatic conjugated diolefin having 4-8 carbon atoms, in admixture with a 2, 6-dimethylol-4-hydrocarbon phenol and at least 3 parts by weight per 100 parts of copolymer of a coniferous softener which comprises rosins, hydrogenated rosins, hydroabietyl alcohols, polymeric hydrogenated rosins, glycol, glycerine and pentaerythritol esters of rosin acids, pine tar, pine oil, rosin based terpenes and dipentenes. The copolymer is preferably derived from isobutylene and isoprene. The phenol may be 2, 6-dimethylol-4-octyl phenol. The compositions may also contain carbon black and may be used in making bags for curing tyres. U.S.A. Specifications 1,996,069, 2,364,192 and 2,808,618 are referred to. |
