GB1052546A - - Google Patents

Abstract

1,052,546. Coated articles. UNITED STATES RUBBER CO. March 2, 1965 [March 18, 1964], No. 8774/65. Heading B2K. The friction coefficient of a dip moulded elastomeric article is reduced by giving it a slip coating comprising a blend of an elastomer and a resin. In making a rubber glove, the form is coated with a release agent and dipped on to an aqeuous dispersion of rubber latex and a latex of an alkyl acrylate resin stabilized against coagulation and containing a polyvalent metal salt coagulant. The form is withdrawn, dried and dipped in a latex glove compound, the thickly deposited rubber being subsequently dried and the coagulant leached out. The article may be further heated to vulcanize the rubber. Alternatively the form is dipped first in a rubber latex and the coagulant leached out, before dipping in the mixture of elastomer latex and resin latex. A girdle with a flocked inner surface is made by dipping the girdle form in the mixed rubber-resin latices (suitably stabilized) containing a coagulant, dipping in rubber latex sensitive to the coagulant and thereafter flocking the exterior surface to give it moisture absorbant properties. The elastomer latex may be any conventional latex suitable for dipping, natural rubber, polychloroprene, polyisoprene S.B.R. and mixtures thereof being preferred; the substrate will generally be the same as the elastomer of the slip coat for optimum adhesion. The latex of the substrate may be pre-cured. Copolymers of dienes with copolymerizable monomers may also be used. The preferred resins are the alkyl acrylates especially copolymers of alkyl acrylate or methacrylate with acrylic or methacrylic acids; vinyl acetate polymers; polyethylene; polyvinyl acetals; vinylchloride polymers and copolymers; styrene acrylonitrile; and high styrene-butadiene copolymers. A non- ionic surfactant is used as a stabilizer for the mixed latices and a polyvalent metal (Ca Mg Al Dc) salt (nitrate chloride or sulphate) or an acid (acetic formic or lactic) may be the coagulant for the thick rubber coating. The release coating is talc in alcohol or acetone.