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:
Nov. 21, 1995
Filed:
Apr. 15, 1994
Michael P Greuel, White Bear Twp, MN (US);
Labros D Arvanitopoulos, Akron, OH (US);
H James Harwood, Stow, OH (US);
University of Akron, Akron, OH (US);
Abstract
The invention relates to the use of cobaloximes and related cobalt(II) complexes which have essentially planar equatorially coordinated ligands and a pair of axially coordinated ligands which have at least one carbon-cobalt bond, as photoinitiators for free radical polymerizations. By selection of the appropriate cobaloximes and related complexes, it is possible to prepare polymers which have useful terminal functionality at both the head and the tail ends of the growing polymer chain. The process also teaches the photochemical polymerization and copolymerizations whereby the alkyl cobaloximes and related compounds, which are used as the photoinitiators, have alkyl groups, which may in essence, be polymers with carbon-cobalt chain ends, thereby allowing grafting reactions to occur to the polymer backbone. While it is possible to synthesize the cobaloxime and related compounds initially, for subsequent addition to a monomer, it is also taught within this invention that the cobalt complex can be prepared 'in-situ', such as by the routes which include: (1) Cobalt-hydride plus monomer addition; (2) free radical initiator plus monomer plus cobalt complex, the ratio of free radical initiator to cobalt complex being essentially 1:1; and (3) the reaction of Co(II) with an alkyl halide.