Patent GB-350450-A (GB)
Title: Improvements in or relating to the manufacture of goods of rubber or similar material
IPC: C08C1/15
Filed: 1930-03-10
Abstract: Granular dispersions of rubber and the like are used to coat articles with a surface ranging from a smooth matt finish to a coarse granular texture as desired.  The granular dispersions may be produced by effecting the coagulation of aqueous dispersions of rubber and the like during stirring by precipitation in situ of compounding ingredients formed by the double decomposition of water soluble reagents having normally no coagulating effect with subsequently added water soluble reagents an ion of which may incidentally possess coagulating influences.  Examples of water soluble reagents of the first class are carbonates, sulphates or silicates of the alkali metals or of ammonium.  Examples of reagents of the second class which interact with reagents of the first class to produce compounding ingredients are soluble salts of magnesium, aluminium, calcium, barium, or zinc.  The size of the aggregates may be varied by a suitable choice of the reagents.  The granular dispersion may be washed with water to remove the water soluble products of the reaction.  Example: To 60 parts of a suitable mix is added 50 parts of a 7 per cent solution of sodium silicate, and then with stirring 45 parts of a 7 per cent solution of magnesium sulphate containing 0,5 per cent glue.  A granular dispersion is obtained which is filtered to separate large granules.  These granular dispersions may be used to provide non-slip soles for shoes, handles for sports implements, or a roughened surface to surgeons' gloves. Specifications 219,635 and 290,313, [both in Class 70, Indiarubber &c.], are referred to.ALSO:Granular dispersions of rubber and the like are used to coat articles with a surface ranging from a smooth matt finish to a coarse granular texture as desired.  The granular dispersions may be produced by effecting the coagulation of aqueous dispersions of rubber and the like during stirring by precipitation in situ of compounding ingredients formed by the double decomposition of water soluble reagents having normally no coagulating effect with subsequently added water soluble reagents an ion of which may incidentally possess coagulating influences.  Examples of water-soluble reagents of the first class are carbonates, sulphates or silicates of the alkali metals or of ammonium. Examples of reagents of the second class which interact with reagents of the first class to produce compounding ingredients are soluble salts of magnesium, aluminium, calcium, barium, or zinc. The size of the aggregates may be varied by a suitable choice of the reagents.  The granular dispersion may be washed with water to remove the water soluble products of the reaction.  Example.  To 60 parts of a suitable mix is added 50 parts of a 7 per cent solution of sodium silicate, and then with stirring 45 parts of a 7 per cent solution of magnesium sulphate containing 0.5 per cent glue.  A granular dispersion is obtained which is filtered to separate large granules. These granular dispersions may be used to provide non-slip soles for shoes, handles for sports implements, or a roughened surface to surgeons gloves. Specifications 219,635 and 290,313, [both in Class 70, Indiarubber &c.], are referred to.