The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 1995
Filed:
Mar. 15, 1994
Akhtar Osman, Sarnia, CA;
Bayer Rubber Inc., Sarnia, CA;
Abstract
A halogenated butyl rubber is prepared by a process wherein a monomer charge comprising isobutylene and conjugated diolefin having the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 which may be the same or different are a methyl group or a hydrogen atom and X is bromine or chlorine together with an initiator having the formula ##STR2## wherein each R.sub.4 is an alkyl, aryl or aralkyl group, Y is preferably an alkoxy, hydroxy, carboxyl or halide, and n is a positive whole number from 1 to 3 are introduced into a suitable reaction vessel in a specified ratio at a temperature of from about -90.degree. to -10.degree. C., a solution of a Lewis acid is added and the monomers are copolymerized at said temperature to form said halogenated butyl rubber, and the halogenated rubber is recovered from solution.