GB815939A - Vulcanizing compositions comprising chlorinated butyl rubber - Google Patents

Abstract

Chlorinated butyl rubber is vulcanized by compounding with an organic nitrogen-containing compound having (1) at least one -NH2 group, (2) at least one -NH2 group and at least one -NH- group, (3) at least two -NH-groups, or (4) a compound which under vulcanizing conditions, forms the nitrogen groups in situ; or mixtures thereof, and curing in the absence of sulphur. The butyl rubber contains a major proportion of iso-olefines, e.g. isobutylene, 2-methyl butene-1, and a minor proportion of diolefines, e.g. isoprene, dimethyl butadiene, piperylene, cyclopentadiene, myrcene, 1-vinylcyclohexene-1,3, and dimethyl fulvene, chlorinated to contain at least 0.5 wt. per cent of combined chlorine but not more than one combined atom of chlorine per double bond in the copolymer. The nitrogen-containing organic compounds may be present in an amount of from 0.1 to 20 weight per cent based on the weight of the chlorinated rubber, and examples are monofunctional primary amines, such as hexyl-, octyl-, decyl-, hexadecyl-, dodecyl-, dimethyl pentyl-, pentamethyl hexyl-, methyl octyl-, diethyl heptyl-, 9-hexadecyl-, a - or b -phenyl ethyl-amines; and naphthyl- and hydrogenated naphthylamines; phenyl-, ethyl-, t-butyl and 2,4,6-trimethyl anilines; toluidines; formaldehyde-p-toluidine reaction products; 2-amino- and 2-methylamino-4-chlorotoluene, 5-amino-1- and 5-methylamino-1-naphthols; o-m- and p-amino-, 2-amino-4-nitro, 2-amino-4-phenyl-, and 2-methylamino-4-phenyl phenols; p-methyl, p-amino and p-methylamino phenyl-acetic acids; p-methyl and p-methylaminophenylacetonitriles; p-amino and p-isopropylamino propriophenones; 4-chloro-, 4-nitro-, 4-chloro-N-methyl-, and 4-nitro-N-methyl anilines, 2-amino-, 2-amino-3-methyl-, 2-amino-4-methyl-, 2-amino-5-methyl-, 2-amino-6-methyl-, 2 - methylamino - 3 - methyl -, 2 - ethylamino - 4 - methyl -, 2 - hexylamino - 5 - methyl -, 2 - methylamino - 6 - methyl -, and 2 - methylamino - pyridines; 3-amino-, 8-amino-, 3-methylamino-, 8-heptylamino-quinolines; ethanolamine and N-methyl ethanolamine; glycine and N-methyl glycine; b -alanine and N-methyl b -alanine; 4-nitro- and N-methyl-4-nitrobenzylamine; b -aminoproprionitrile; a -aminoacetamide; m-(p-anilinophenylazo)- and p-amino-benzene sulphonic acid; b -chloroethylamine; and N-methyl anthranilic and sulphanilic acids. Optional ingredients may be zinc, magnesium, calcium and lead oxides or basic metallo-organic lead stearate or mixtures thereof; pigments and fillers such as titanium dioxide, clays, ultramarine blue, carbon black, silica, calcium carbonate, ferric hydroxide, chrome yellow, and Prussion blue; tackifiers such as phenol or p-toluidine formaldehyde resins; accelerators and calcium silicate and the composition may be vulcanized at from 270-400 DEG F. The vulcanized composition may be used in tyres, electrical insulation, tyre curing bags, car window channels and tie-ply compositions, and proofed goods.