Patent GB-599173-A (GB)
Title: Improvements in or relating to the vulcanisation of synthetic rubbers
IPC: C08K5/32
Filed: 1945-09-14
Abstract: Butadiene elastomers which are produced by emulsion polymerization of polymerizable materials comprising at least 15 per cent of butadiene-1 : 3 hydrocarbons are vulcanized by incorporating 0.1 to 3.0 parts of a m- or p-dinitrosobenzene per 100 parts of elastomer and subsequently applying vulcanizing conditions.  The dinitrosobenzenes may have up to three alkyl, cycloalkyl, aralkyl, alkoxy or halogen groups, specified compounds are the following dinitrosobenzenes: P-; 2-methyl-1 : 4-; 2-fluoro-1 : 4-; 5-methoxy-1 : 3-; 2-methyl-5-isopropyl-1 : 4-; 5-chloro-1 : 3-; 2-benzyl-1 : 4 and 2-cyclohexyl-1 : 4-dinitrosobenzene.  The elastomers may be polymers of butadiene, 1 : 3-isoprene or chloroprene or copolymers of these substances with styrene, acrylonitrile, methacrylic nitrile, vinylidene chloride, methyl vinyl ketone, dialkyl vinylethynyl carbinols and the acrylic and methacrylic esters such as ethyl methacrylate. Many examples are given to illustrate the effect of these dinitroso benzenes on mixes which may contain an activator such as red lead, lead dioxide, zinc peroxide, lead chromate or N-nitroso diphenylamine or substances such as sulphur, channel black, semi-reinforcing furnace black, zinc oxide or stearic acid as well as one or more accelerators from 2-mercaptobenzthiazole, 2-mercaptothiazole, tetramethyl thiuram mono- and di-sulphides, benzthiazyl-cyclohexyl sulphenamide, piperidinium pentamethylene dithiocarbamate, zinc diethyl dithiocarbamate, diphenyl quanidine, tetramethyl-ammonium formate, butyraldehyde-aniline condensation product, tetramethylenepentamine and phenyl a -naphthylamine.ALSO:Butadiene elastomers which are produced by emulsion polymerization of polymerizable materials comprising at least 15 per cent. of butadiene 1:3 hydrocarbons are vulcanized by incorporating 0.1 to 3.0 parts of a m- or p-dinitrosobenzene per 100 parts of elastomer and subsequently applying vulcanizing conditions. The dinitrosobenzenes may have up to 3 alkyl, cyloalkyl, aralkyl, alkoxy, or halogen groups, specified compounds are the following dinitrosobenzenes:-p.-; 2-methyl-1:4-; 2-fluoro-1:4-; 5-methoxy-1:3-; 2-methyl-5- isopropyl-1:4-; 5-chloro-1:3; 2-benzyl-1:4- and 2-cyclohexyl-1:4-dinitrosobenzene. The elastomers may be polymers of butadiene 1:3, isoprene or chloroprene or copolymers of these substances with styrene, acrylonitrile, methacrylic nitrile, vinylidene chloride, methyl vinyl ketone, dialkyl vinylethynyl carbinols and the acrylic and methacrylic esters such as ethyl methacrylate.  Many examples are given to illustrate the effect of these dinitrosobenzenes on mixes which may contain an activator such as red lead, lead dioxide, zinc peroxide, lead chromate or N-nitroso-diphenylamine or substances such as sulphur, channel black, semi-reinforcing furnace black, zinc oxide, or stearic acid as well as one or more accelerators from the list 2-mercaptobenzthiazole, 2-mercaptothiazoline, tetramethyl thiuram mono- and di-sulphides, benzthiazylcyclohexyl-sulpheneamide, piperidinium pentamethylene-dithiocarbamate, zinc diethyl dithiocarbamate, diphenyl guanidine, tetramethylammonium formate, butyraldehyde-aniline condensation product, tetraethylenepentamine, and phenyl a-naphthylamine.