GB737447A - Improvements in or relating to partially hydrohalogenated interpolymers - Google Patents

Abstract

Partially hydrohalogenated interpolymers are derived from rubbery interpolymers of a major proportion of an isoolefin containing from 4 to 8 carbon atoms and a terminal methylene group with a minor proportion of a polyolefinic hydrocarbon, said hydrohalogenated interpolymer retaining some olefinic unsaturation and having a halogen content of from 0.1 per cent of fluorine, chlorine or bromine up to 1.0 per cent equivalent of fluorine, in the structure <FORM:0737447/IV (a)/1> Isoolefins specified are isobutylene, 3-methyl or 2-ethyl butene-1, 4-methyl or 4-ethyl pentene-1 or mixtures and polyolefins tabulated include acyclic and alicyclic conjugated and non-conjugated diolefins, acyclic and alicyclic triolefins, tetra- and penta-olefins and polyolefinic hydrocarbons containing aromatic nuclei. Other monomers such as styrene, chlorostyrene and acrylyl and methallyl chlorides may be copolymerized with the isoolefin and the polyolefin. The hydrohalogenation may be carried out in solution, dispersion or cement or by passing gaseous hydrogen chloride or bromide over the solid interpolymer. Solvents specified are toluene, chlorobenzene, methyl and ethyl chlorides, trichloroethane, carbon tetrachloride, butane, hexane and heptane. Solvents may be subsequently removed by running the solution, e.g. stabilized with an epoxidized diester of cotton seed fatty acid, into water containing a colloidal protective agent such as zinc stearate. The products may be admixed, by blending dispersions, latices or solutions, with natural or synthetic rubbers and these mixtures or the products alone may be compounded and vulcanized with the usual ingredients, particularly by means of zinc oxide and carbon black. The hydrohalogenated interpolymers may be used as adhesives, for the manufacture of inner tubes and tyre curing bags and in bonding non-hydrohalogenated interpolymers, natural rubber and synthetic rubbers such as butyl rubber.ALSO:A composition comprises natural rubber and a partially hydrohalogenated interpolymer of a major proportion of an isoolefin containing from 4 to 8 carbon atoms and a terminal methylene group, with a minor proportion of a polyolefin, said hydrohalogenated interpolymer retaining some olefinic unsaturation and having a halogen content of from 0.1 per cent of fluorine, chlorine or bromine up to 1.0 per cent equivalent of fluorine, in the structure <FORM:0737447/V/1> The compositions may be obtained by blending dispersions, latices or suspensions and may be compounded and vulcanized with the usual ingredients and also with bivalent metal oxides, in particular zinc oxide in the presence of carbon black, to give products of improved physical properties. Examples 11 to 15 describe the use of the hydrohalogenated interpolymers as adhesives (in heptane solution) for bonding butyl rubber to natural rubber.