Patent GB-453299-A (GB)
Title: Improvements in or connected with the production of rubber compositions
IPC: C08L95/00
Filed: 1935-06-13
Abstract: Rubber - bituminous compositions, which when diluted with water may be used as a paint, are prepared from rubber latex and aqueous bituminous emulsions, each containing a stabilizing agent such as casein, by incorporating with the latex and with the emulsion separately finely-divided solid non-colloidal mineral filling material in such proportion that each becomes of a plastic consistency and then mixing together in the cold the two resulting plastics.  Filling materials specified are talc, loomite, burnt fireclay, barytes, slate dust, whinstone flour; different filling materials may be added to the latex and to the emulsion.  Up to about 60 per cent by weight of filling material may be added to the latex and up to about 40 per cent may be added to the emulsion.  The latex plastic and the bitumen plastic may be mixed in proportions varying from 50--50 per cent to 90--10 per cent by weight, although the amount of bitumen plastic present may exceed the amount of latex plastic.  A quantity of latex may be added to the bitumen plastic before mixing with the latex plastic.  It is stated that the compositions may be stored indefinitely in their plastic state if kept out of contact with air.  According to the Provisional Specification (a) filling materials need not be mixed with the latex prior to admixture with the bitumen plastic, but the bitumen plastic should contain a small proportion, e.g. 2 per cent of inert fibrous material such as asbestos fibre; (b) a colloidal clay such as bentonite may be added to the latex; (c) creosote or pine tar may be used as a stabilizer for the bitumen emulsion.ALSO:Rubber-bituminous compositions are prepared from rubber latex and aqueous bituminous emulsions, each containing a stabilizing agent such as casein, by incorporating with the latex and with the emulsion separately finely divided solid non-colloidal mineral filling material in such proportion that each becomes of a plastic consistency and then mixing together in the cold the two resulting plastics.  Filling materials specified are talc, loomite, burnt fireclay, barytes, slate dust, whinstone flour; different filling materials may be added to the latex and to the emulsion.  Up to about 60 per cent by weight of filling material may be added to the latex and up to about 40 per cent may be added to the emulsion.  The latex plastic and the bitumen plastic may be mixed in proportions varying from 50-50 per cent to 90-10 per cent by weight, although the amount of bitumen plastic present may exceed the amount of latex plastic.  A quantity of latex may be added to the bitumen plastic before mixing with the latex plastic.  It is stated that the compositions may be stored indefinitely in their plastic state if kept out of contact with air. The compositions with or without admixture with cement, colouring material and/or aggregate may be used as flooring, deck covering, or road surfacing material.  The compositions may be diluted with water and applied as a paint.  According to the Provisional Specification, (a) filling materials need not be mixed with the latex prior to admixture with the bitumen plastic, but the bitumen plastic should contain a small proportion, e.g. 2 per cent of inert fibrous material such as asbestos fibre; (b) a colloidal clay such as bentonite may be added to the latex; (c) creosote or pine tar may be used as a stabilizer for the bitumen emulsion; (d) the composition when thinned with water may be used as an adhesive.