| 摘要 |
523,626. Golf &c. balls DUNLOP RUBBER CO., Ltd.. TWISS, D. F., and NEALE, A. E. T. Jan. 11, 1939, No. 911. [Class 132 (ii)] In the manufacture of a golf or other ball, a resilient core of specific gravity greater than unity is produced by disintegrating a vulcanized composition of rubber, vulcanizing agents and powdered mineral fillers, wetting the disentegrated particles with a liquid medium sufficient to fill the interstitial spaces between the particles and enclosing the wetted material in a rubber container. For example, a rubber compound of high specific gravity formed from a vulcanized mixture of lead powder, rubber, sulphur, zinc oxide, mercapto benzthiazole and stearic acid is disintegrated and wetted with water containing 1 per cent. of commercial sodium lauryl sulphate, the resulting mixture being filled into golf ball centre bags. The small particles may be formed by cutting up a fine thread of rubber compound. In making a modified filling a vulcanized mass of lead powder and rubber composition is disintegrated, wetted with a wetting agent, covered with potassium formate solution, boiled gently and the excess of liquid decanted. In a further preparation, lead powder is mixed into a paste with water containing 2 per cent. of sodium lauryl sulphate and the mixture is added to latex. Solutions of sodium silicate and ammonium alum are stirred in until the compounded latex settles out in the form of discrete particles of coagulate. The particles are filtered off, dried and vulcanized. The vulcanized particles are treated with potassium formate solution, boiled gently and decanted.
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