Process for the preparation of novel high chlorinated butyl rubber and vulcanizable composition thereof
AssigneeNippon Oil Co., Ltd.
InventorsShozo Tsuchiya, Yoshikazu Murai, Saburo Matubara
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Abstract
A process for preparation of a highly chlorinated isobutylene-multiolefin copolymer, such as butyl rubber, containing more than one but not exceeding two chlorine atoms per double bond of the copolymer by chlorinating such copolymer in the presence of an aliphatic diamine derivative, such as ethylene diamine, propylene diamine, piperazine, triethylene diamine or bis-N,N-ethylene-ethylene diamine. A vulcanizable composition containing such chlorinated copolymer has has improved rate of vulcanization, covulcanizability with highly unsaturated rubber and adhesiveness.
Claims8
A process for the preparation of a chlorinated isobutylene-multiolefin copolymer having a multiolefin unit containing 4 to 6 carbon atoms, which comprises contacting a chlorinating agent with a solution of an isobutylene-multiolefin copolymer composed of 80 to 99.5 mol percent of isobutylene units and 20 to 0.5 mol percent of the multiolefin units in an inert organic solvent at a temperature of 0.degree. to 100.degree.C. and in the presence of 0.01 to 10 parts by weight per 100 parts by weight of the copolymer of an aliphatic diamine derivative of the formula ##EQU6## wherein X is an aliphatic hydrocarbon residue of 2 - 6 carbon atoms, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a member selected from the group of hydrogen and an alkyl group of 1 - 3 carbon atoms, any two of which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 taken together may form an aliphatic hydrocarbon residue of 2 - 6 carbon atoms, said chlorination reaction being carried out to such an extent that from 1.5 to 1.9 chlorine atoms per double bond contained in the copoloymer are introduced into the copolymer.
Dependencies are inferred from the claim text.