SE303990B - - Google Patents

Abstract

In the manufacture of rubber articles from saturated amorphous copolymers of ethane and propene or butene (1) satisfactory adhesion of the rayon cord threads or fabrics used for reinforcement is obtained by a process comprising (1) impregnating the rayon cord thread or fabric with an aqueous dispersion containing (a) a reactive di- or polymethylol phenol resin obtained from a phenol and formaldehyde and (b) a partially unsaturated amorphous copolymer optained by reacting a copolymer of ethene and propene or butene (1) with an N-bromodicarboxylic acid imide, e.g. N-bromo-succinimide, or an N-bromo-carboxylic acid amide, (2) embedding the impregnated materials after drying in a vulcanizable mixture of a partially unsaturated amorphous copolymer of the kind described under (1) (b) which also contains sulphur and accelerators, (3) applying to the composite structure a vulcanisable mixture of the saturated amorphous copolymer of ethene and propene or butene-(1) and at least one peroxide, e.g. dicumyl peroxide or tert, butyl cumyl, peroxide, and sulphur to bring about cross-linking and (4) vulcanizing the composite-structure while imparting to it a final shape. The mixture of the partially unsaturated amorphous copolymer used in step (2) of the process may also contain active or inactive fillers, process oils, pigments and tackifiers. Suitable vulcanization accelerators are zinc dimethyl dithiocarbaminate, 2-mercapto benzothiazole, N-cyclohexyl-2-benzothiazyl sulphene amide, tetramethyl thiuram mono- or di-sulphide, di-phenyl guanidine, morpholine or morpholine disulphide. The di or polymethylol phenol resin may be made from phenol, an alkyl phenol, pyrogallol or resorcinol and may be added as the resin precondensate or formed in situ.