GB590933A - Improvements in or relating to the manufacture of rubber transformation products - Google Patents

Abstract

The rubber transformation product obtained by mechanically working vulcanised natural or synthetic rubber, 10-50 per cent. of a monohydric phenol and sulphuric or an aromatic sulphuric acid at a temperature below the boiling point of the phenol (see Groups IV and V) is converted into a coating composition by dissolving or dispersing the product in solvents such as petroleum naphtha, benzene or xylene, and adding fillers, plasticisers pigments such as titanium dioxide, and also oil soluble red dyes and natural and synthetic resins such as tert.-butyl phenol-formaldehyde resin.ALSO:A modified synthetic rubber is obtained by forming a plastic mixture of a vulcanized copolymer of a diolefine such as a butadienestyrene copolymer, a monohydric phenol such as phenol or a - or b -naphthol and sulphuric or an aromatic sulphuric acid, the amount of the phenol being between 10 and 50 per cent of that of the copolymer and subjecting the mixture to mechanical working while maintaining it at a reaction temperature below the boiling point of the phenol. This temperature may lie between 70 and 125 DEG C., the optimum temperature being about 100 DEG C. The product may be converted into coating compositions by dissolving or dispersing in solvents such as petroleum naphtha, benzene or xylene, to which may be added fillers, plasticizers, pigment such as titanium dioxide, and also oil soluble red dyes and natural and synthetic resins such as tert.-butyl-phenol-formaldehyde resins. The Provisional Specification describes also the preparation of corresponding derivatives from unvulcanized diolefine copolymers.ALSO:A rubber transformation product is obtained by forming a plastic mixture of vulcanized natural or synthetic rubber, a monohydric phenol such as phenol or a - or b -naphthol, and sulphuric or an aromatic sulphuric acid, the amount of the phenol being between 10 and 50 per cent. that of the rubber, and subjecting the mixture to mechanical working while maintaining it at a reaction temperature below the boiling point of the phenol. The synthetic rubber may be a polymer or copolymer of a diolefine. In one of several examples, the vulcanized rubber contains sulphur, ceresine wax, mineral rubber, a condensation product of aniline with acetaldehyde and formaldehyde and NN1 dibutanaphthyl paraphenylene diamine. The reaction temperature may be between 70 DEG and 125 DEG C., the optimum temperature usually being about 100 DEG C. The product may be converted into coating composition by dissolving or dispersing in solvents such as petroleum naphtha, benzene or xylene. These compositions may be used to join sheets of unvulcanized synthetic rubber such as the copolymer of butadiene with styrene together, as a priming material in bonding rubber flooring, linoleum fabrics or paint to concrete, and also as a resistant coating against water, acid and alkali, to be applied to steel, wood and concrete. The Provisional Specification describes also the preparation of a corresponding derivative from unvulcanized rubber.