Patent GB-395430-A (GB)
Title: Improvements in or relating to the production of compositions containing derivatives of balata resins or gutta or similar resins
IPC: C08C19/10
Filed: 1932-02-03
Abstract: An adhesive suitable for bonding rubber to metal &c. surfaces is made by heating a polymerizable unsaturated hydrocarbon with balata-, gutta percha-, or rubberresins, and a condensing agent such as sulphuric, sulphonic, or phosphoric acids, or stannic chloride. Several examples are given, of which the following are typical: (1) 30 parts of smoked sheet are mixed with 70 parts of balata resin and heated to 100 DEG  C. until dissolved therein; 10-20 per cent of phenolsulphonic acid is added and the mixture is heated to 130 DEG C.  (2) 70 parts of balata resin, 50 parts of toluene and 30 parts of masticated smoked sheet are heated to 100 DEG  C. for three hours with stirring until dissolved.  The solution is heated to 110 DEG  C. and 4 parts of heated phenol sulphonic acid are stirred in, the temperature being maintained at 110 DEG  C. for 5-10 hours.  The solid adhesive or a solution may be dispersed in water by stirring with the addition of emulsifying agents, e.g. casein, oleic acid, ammonia.  Treatment of the hot reaction products with solid calcium hydroxide or magnesium oxide, or with a -naphthylamine, or a mixture of aldol, a  and b -naphthylamines enhances the keeping properties of the adhesive.  Silica, kieselguhr and vulcanizing agents may also be added.ALSO:An adhesive, suitable for bonding rubber to metal &c. surfaces, is made by heating a solution of a polymerizable unsaturated hydrocarbon such as rubber, in, or with balata-, gutta percha-, or rubber-resins, reclaim, turpentine, isoprene, or butadiene, with a condensing agent such as sulphuric-, sulphonic, phosphoric-, acid, or stannic chloride.  Suitable proportions are 5-30 per cent of rubber on the mixture.  The amount of condensing agent should be kept as low as possible, for example 3 1/2 per cent of sulphonic acid, and the temperature, 100-150 DEG  C., is preferably kept low for a longer time, than high for a shorter. Several examples are given, of which the following are typical : (1) 30 parts of smoked sheet is mixed with 70 parts of balata resin and heated to 100 DEG  C. until dissolved therein.  10-20 per cent of phenolsulphonic acid is added and the mixture is heated to 130 DEG C.  After 30 min. the mixture froths, when it is removed from the oven and stirred.  On subsidence of the frothing, the mass is cooled, crushed, and washed free from acid.  (2) 70 parts of balata resin, 50 parts of toluene, and 30 parts of masticated smoked sheet are heated to 100 DEG  C. for three hours with stirring until dissolved.  The solution is heated to 110 DEG  C. and 4 parts of heated phenol sulphonic acid are stirred in, the temperature being maintained at 110 DEG  C. for 5-10 hours.  The thermoplastic masses of both examples may be dissolved in toluene to yield a solution which is applied to a metal &c. plate: after evaporation of the solvent, a sheet of rubber is applied and vulcanized under pressure.  The solid adhesive or a solution may be dispersed in water by stirring with the addition of emulsifying agents, e.g. casein, oleic acid, ammonia. Treatment of the hot reaction products with solid calcium hydroxide or magnesium oxide, or with a -naphthylamine, or a mixture of aldol a and b -naphthylamines enhances the keeping properties of the adhesive. Silica, kieselguhr, and vulcanizing agents may also be added.