GB806933A - Improved rubbery composition and article made therefrom - Google Patents

Abstract

A rubbery composition suitable for use in the bonding of rubber to metal comprises a vulcanizable rubbery material and a partially calcined metal-organic compound in an amount of up to 10 per cent by weight based on the weight of the rubbery material. The metal organic compound may be a cobalt, copper, iron, lead, mercury or nickel salt of an organic acid containing only carbon, hydrogen and oxygen. Specified compounds are cobaltous acetate, cobaltous butyrate, cobaltous citrate, cobaltous formate, cobaltous oleate, cobaltous tartrate, cupric acetate, cupric benzoate, cupric butyrate, cupric stearate, ferric acetate, ferric benzoate, ferric formate, lead acetate, lead citrate, lead palmitate, mercuric acetate, mercuric benzoate, mercuric propionate, nickel acetate, nickel oxalate, nickel propionate, nickel stearate, silver acetate and silver stearate. The compound may be heated for from 150-170 DEG C. for 24-72 hours. The rubbery material may be natural rubber or polymers of butadiene-1,3; isoprene; 2,3-dimethyl butadiene-1,3; 1,4-dimethyl butadiene-1,3; piperylene; chlorobutadiene-1,3; and copolymers of these monomers with isobutylene, styrene, methyl styrene, chlorostyrene, acrylonitrile, methacrylonitrile, alpha chloroacrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and 2-vinyl pyridine, or interpolymers of 3 or more monomers such as that of butadiene-1,3 with styrene and acrylonitrile; rubbery olefin polysulphide polymers, rubbery polyacrylates, rubber polymers containing a curable -COOH or -COOR group formed from a diene and an unsaturated carboxylic acid and the reaction products of a diisocyanate with an hydroxyl terminated polyester. Compounding ingredients such as phenyl-beta-naphthylamine, aldol-alpha-naphthylamine, 2-mercapto benzothiazole disulphide, polymerized trimethyl dihydroquinoline, N-cyclo-hexyl-2-mercaptobenxothiazole sulphene amide, polyaralkylated phenols, 2-mercaptobenzothiazole, precipitated silicon dioxide, precipitated calcium silicate, zinc salt of mercaptobenzothiazole, red iron oxide, zinc oxide, magnesia, titanium dioxide, yellow iron oxide, arc silica, silicon monoxide, clay, carbon black, stearic acid, cellulose flock, hexamethylene tetramine, sulphur, pine tar oil, paraflux heavy oil, tetramethyl thiuram disulphide, calcium hydroxide, triethyl trimethylene triamine, triethylene tetramine, sodium meta silicate, red lead, paraquinone dioxime, rosins and resins may also be added. In a modification the partially calcined metal organic compound can be deposited as a thin layer on the metal or rubber surfaces, and rubber or metal applied and the whole assembly then vulcanized.