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:
Jan. 10, 1978
Filed:
Oct. 07, 1974
Japan Synthetic Rubber Co., Ltd., Tokyo, JA;
Abstract
A catalyst composition consisting essentially of a reaction mixture of (A) at least one member selected from the group consisting of compounds of W, Mo, Re and Ta, (B) at least one member selected from the group consisting of organometallic compounds of elements of Groups IA, IIA, IIB and IIIA of the Deming Periodic Table, and (C) at least one member selected from the group consisting of compounds of V, Cr, Mn, and elements of Groups IVB and VIII of the Deming Periodic Table, has a very high activity in the ring-opening polymerization of norbornene derivatives having at least one polar substituent selected from the group consisting of ester groups, nitrile groups, amide groups, imide groups, carboxylic acid anhydride groups and halogens. The metal atom ratio of (C)/(A) is usually 0.001 - 50, and the molar ratio of (B)/(A) is usually 1 - 10. At least one said norbornene derivative and at least one cycloolefin other than cyclohexene can also successfully be subjected to ring-opening copolymerization with said catalyst.