Abstract:
A PREMIX IS MADE FOR INCORPORATION IN A NATURAL OR SYNRHETIC VULCANIZABLE RUBBER MIXTURE OF IMPROVED ADHESION TO TEXTILES BY CONGULATING AN AQUEOUS DISPERSION OF FINELY DIVIDED PRECIPITATED SILICIC ACID OR SILICATE AS A RUBBER LATEX AND MIXING RESORCINOL AND HEXAMETHYLENETETRAMINE AS RESIN-FORMING COMPONENTS INTO THE DRY COGULATE. THE INVENTION ALSO COMPRISES THE VULCANIZABLE PREMIX THUS MADE IN WHICH SPECIFIC AMOUNTS OF SYNTHETIC RUBBER, SILICIC ACID, RESORCINOL AND HEXAMETHYLENETETRAMINE ARE INCORPORATED.
Abstract:
METHOD OF IMPROVING THE ADHESION OF VULCANIZED RUBBER COMPOSITIONS TO METALS COMPRISING ADMIXING (1) ACTIVE REENFORCING EXTREMELY FINELY DIVIDED SILICAS AND/OR ALUMINUM SILICATE AND/OR CALCIUM SILICATED OR CALCIUM CARBONATE, IF DESIRED, BLENDED WITH CARBON BLACK, AND (2) COMPONENTS CAPABLE OF RESIN FORMATION WITH THE RUBBER COMPOSITION BEFORE IT IS VULCANIZED ON THE METAL. THE QUANTITY OF THE SILICAS OR SILICATES OR CALCIUM CARBONATE ALONE OR BLENDED WITH CARBON BLACK ADMIXED WITH THE RUBBER COMPOSITION IS 5 TO 100, PREFERABLY, 10 TO 50 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF RUBBER. A FURTHER IMPROVEMENT IN THE BOND OBTAINED CAN BE ACHIEVED BY ADMIXTURE OF HEAVY METAL OXIDES WITH THE RUBBER COMPONENTS PRIOR TO THE VULCANIZATION.
Abstract:
1,131,695. Rubber textile laminates. DEUTSCHE GOLDUND SILBERSCHEIDEANSTALT. 27 April, 1967 [6 July, 1966], No. 19434/67. Heading B5N. [Also in Division C3] To improve the adhesion of natural or synthetic rubber to textile fabrics, resin-forming components comprising an aldehyde or aldehyde donor and a phenol or amine are intimately mixed with a filler comprising extremely finely divided active silica and/or aluminium silicate and/or calcium silicate and/or calcium carbonate by grinding or adsorptively by applying the resin-forming components in solution in a solvent, working the resultant mixture into a rubber sheet and vulcanizing the thus prepared rubber sheet on to a textile fabric. The resinforming components are preferably resorcinol and hexamethylene tetramine, the weight ratio of resin-forming components to fillers being from 1: 5 to 5:1. Resorcinol may be ground with the filler, preferably silica, on a mill and the resulting master batch worked into a rubber mixture containing the hexamethylene tetramine. Alternatively resorcinol is applied in solution to the finely divided fillers and the resulting product is worked into the rubber mixture. The hexamethylene tetramine is either ground with the filler or applied by adsorption in the form of an aqueous solution, and the resulting product is worked into rubber with the master batch of resorcinol and silica.
Abstract:
The present invention provides a vulcanizable rubber mixture for tire treads which is based on rubbers capable of being cross-linked, silica filler, processing oil, sulphur-con-taining organosilanes and accelerator, said mixture comprising one or two polybutadiene rubbers in amounts of 20 to 100% by weight of the proportion of elastomer, one or two rubbers other than polybutadiene selected from synthetic rubbers and natural rubbers in amounts of 80 to 0% by weight of the proportion of elastomer in the rubber mixture, active silica filler in amounts of more than 80 parts by weight per 100 parts by weight of rubber, processing oil in amounts of 40 to 100 parts by weight per 100 parts of rubber, at least one bis-¢-alkoxy silyl alkyl!oligosulphide in amounts of 0.1 to 25% by weight per 100 parts by weight of rubber, sulphur in amounts totalling approximately 0.2 to 8 parts by weight per 100 g of rubber and at least one vulcanization accelerator in amounts of approximately 0.1 to 8 parts by weight per 100 parts by weight of rubber The present invention also includes a tire tread formed from said mixture.