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:
Sep. 05, 1995
Filed:
Oct. 07, 1994
Michael C Baird, Kingston, CA;
Queen's University at Kingston, Kingston, CA;
Abstract
Iso-butylene based polymers and particularly butyl rubber may be polymerised from iso-butylene or iso-butylene/isoprene mixtures respectively using a metallocene type catalyst. In particular, polymerization or co-polymerization takes place very rapidly under anhydrous and anaerboic conditions at temperatures between -100.degree. C. and -20.degree. C. in the presence an initiator co-initiator system comprising Cp'MXX'X'/BRR'R' in an organic solvent such as toluene, where Cp' is a .pi.-bonded cyclopentadienyl or substituted cyclopentadienyl ligand; M is selected from titanium, zirconium and hafnium; XX' and X' are the same or different anionic groups containing 1-20 nonhydrogen groups; B is boron; and R, R' and R' are the same or different anionic groups containing 1-30 nonhydrogen groups.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile