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:
Feb. 24, 1976
Filed:
Jun. 12, 1974
Bridgestone Tire Company Limited, Tokyo, JA;
Abstract
A method for manufacturing a high molecular weight, elastic and random type butadiene-propylene copolymer whose propylene content is in the range of 3 to 45 mol%, which comprises copolymerizing butadiene and propylene in the molar ratio ranging from 1/10 to 10/1 at a temperature in the range of 0.degree. to 80.degree.C in the presence of a catalyst system consisting of (1) at least one compound selected from the group consisting of titanium tetrachloride, titanium tetrabromide and vanadyl trichloride, (2) an organoaluminum compound having the general formula, ALR.sup.1 R.sup.2 R.sup.3 wherein R.sup.1, R.sup.2 and R.sup.3 represent a hydrocarbon radical and (3) phosgene, in which said components (2) and (3) are mixed at room temperature prior to the addition of other catalyst components and of monomers. The resulting random butadiene-propylene copolymer is highly elastic and superior to cis-1,4-polybutadiene in resistance to thermal aging.