GB903387A - Non-slip structures - Google Patents

Abstract

Sheet material suitable as floor covering has a non-smooth wearing surface of cured resilient rubber, exemplified by polychloroprene, butadiene-acrylonitrile copolymer, butadiene-styrene copolymer and natural rubbers, in which are trapped randomly scattered protruding particles, of size 10-40 mesh U.S. Standard Sieve, of cork or a material, such as rubber or sponge rubber, similar in compressibility, resilience and flexibility to cork. According to an example, cotton drill cloth was impregnated with polyvinyl acetate and coated with curable phenolformaldehyde resin, this cloth was coated with a blend of polychloroprene rubber, phenyl beta naphthylamine as antioxidant therefor, kaolin as filler, the calcium salt of the product formed by coupling diazotized o-chloro-p-toluidine m-sulphonic acid with beta-hydroxy naphthoic acid as red pigment, magnesium oxide, zinc oxide and 2-mercaptoimidazoline as curing agents, toluene and oil-soluble, heatadvancing p-butyl phenol-formaldehyde resin, into the coating were dropped cork particles which had been coloured red by a 1-amino-4-hydroxyanthraquinone dye, and the assembly was cured by heating in 30 min. to 230 DEG -250 DEG F., maintaining this temperature for 30 min. and allowing cooling in 30 min. Alternative stains for the cork are 1,4,5,8-tetraminoanthraquinone blue and alizarine cyanine green; alternative rubber pigments are copper phthalocyanine and carbon black. Thin films of polythene or nylon may be sprayed on the surface to follow the irregularities. According to another example, cork particles were mixed into a blend of polychloroprene, sodium acetate, magnesium oxide, zinc oxide, phenyl alpha naphthylamine, p-butyl phenol-formaldehyde resin, paracoumarone-indene resin, ethyl alcohol and toluene, the mixture was applied to polyethylene-coated kraft paper, cork particles were dropped on, and coating was dried and then cured by heating for one hour in a forced air oven at 150 DEG F.