Vulcanisable rubber mixts. with improved bonding to reinforcement

摘要

Vulcanisable rubber mixts. (I), with improved adhesion to steel cord- or textile fibre-based reinforcements, are claimed, together with the vulcanisation of such mixts.; (I) contain vulcanisable rubber, adhesion promoters (II), vulcanising agents, hardening agents, fillers and the usual additives; the novelty is that (II) is a modified novolak which is obtd. by simultaneous reaction of a polyhydric phenol with an aldehyde and an unsatd. hydrocarbon (III) at elevated temp. in the presence of an acid catalyst, and which contains no residual free phenol. (II) is produced from resorcinol, 1-10C aldehyde (pref. formaldehyde or a source thereof) and (III) (pref. a vinylaromatic cpd.), with mol. ratio resorcinol:(III):aldehyde = (1:0.1:0.3)-(1:1.5:0.95), pref. (1:0.4:0.5)-(1:1.1:0.8); (I) contain up to 20 wt.% (II).