Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1994-04-15
1995-11-21
Berman, Susan W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 65, 522 66, 522 67, 522 68, 522 26, 522 28, 522 29, 522904, 522177, 522178, 522182, C08F 248, C08F 444, C08F 1808, C08F 2018
Patent
active
054687853
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.
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Arvanitopoulos Labros D.
Greuel Michael P.
Harwood H. James
Berman Susan W.
University of Akron
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