Process for improving the adhesion of shaped structures made from polyesters to rubber elastomers

摘要

An impregnating bath for improving the adhesion of shaped articles of polyesters to rubber elastomers comprises an aqueous dispersion of a latex of rubber elastomer and a finely divided organic compound having a plurality of isocyanate groups and enveloped by a film-forming compound which is inert to the isocyanate and stable to water at temperatures of up to 50 DEG C. Suitable encapsulated isocyanates are described in Specification 1,053,500. In exemplified compositions the rubber latex is a latex of a copolymer of butadiene, styrene and vinyl pyridine and the bath also contains a water-soluble resorcinol formaldehyde condensate, formaldehyde, ammonia, polyvinyl methyl ether and naphthalene-1,5-diisocyanate which has been encapsulated by polystyrene, substituted phenol/xylene/formaldehyde condensation product, polyvinyl decahydronaphthyl ether or chlorinated rubber.ALSO:The adhesion of polyester cords and fabrics to rubber is improved by impregnating the cords and fabrics with an aqueous dispersion of a rubber latex and a finely divided organic compound having a plurality of isocyanate groups and enveloped by a film-forming compound which is inert to the isocyanate and stable to water at temperatures of up to 50 DEG C. Suitable film-forming compounds include polystyrene, phenol-xylene-formaldehyde resin, chlorinated rubber, and polyvinyl decahydronaphthyl ether. The aqueous compositions may also contain a water-soluble resorcinal-formaldehyde condensate, formaldehyde, ammonia, and polyvinyl methyl ether. The exemplified isocyanate is naphthalene- 1, 5- düsocyanate and the exemplified rubber is a terpolymer of butadiene, styrene, and vinyl pyridine.