G - Physics – 03 – G
Patent
G - Physics
03
G
96/209, 402/397,
G03G 9/12 (2006.01) C08F 2/22 (2006.01) C08F 212/06 (2006.01) C08F 220/10 (2006.01) G03G 5/14 (2006.01) G03G 5/147 (2006.01) G03G 8/00 (2006.01) G03G 9/13 (2006.01)
Patent
CA 1272549
CROSSLINKED VINYL POLYMER PARTICLES AND ELECTROGRAPHIC ELEMENTS AND LIQUID DEVELOPERS CONTAINING SUCH PARTICLES Abstract The invention provides new crosslinked vinyl polymer particles, new coating compositions containing such particles, new liquid electrographic developers containing such particles, new electro- graphic elements containing one or more layers comprising such particles, and new electrographic records containing toner images and/or layers comprising such particles. Each of the inventive particles has an average diameter less than one micrometer and is characterized in that it comprises a crosslinked vinyl addition copolymer obtainable by aqueous emulsion polymerization of a mixture of monomers wherein: 1.5-15 percent by weight of the mixture of monomers comprises polyfunctional vinyl addition- polymerizable monomers in order to form crosslinking structural units in the copolymer; 85-98.5 percent by weight of the mixture of monomers comprises monofunctional vinyl addition-polymerizable monomers selected such that: A. 0-98.5 percent by weight of the mixture of monomers comprises monofunctional monomers, the homopolymers of which would be insoluble in but swellable by an isoparaffinic hydrocarbon liquid; B. from 0 to less than 85 percent by weight of the mixture of monomers comprises mono- functional monomers, the homopolymers of which would be soluble in the isoparaffinic hydrocarbon liquid; and C. 0-60 percent by weight of the mixture of monomers comprises monofunctional monomers, the homopolymer of which would be insoluble in and not swellable by the isoparrafinic hydrocarbon liquid; with the provisos that: I. if more than 0 percent by weight of the mixture of monomers comprises the monomers of part C., above, then more than 0 percent by weight of the mixture of monomers comprises the monomers of part B., above; II. if more than 9 percent by weight of the mixture of monomers comprises the monomers of part C., above, then less than 10 percent by weight of the mixture of monomers comprises the monomers of part A., above; and III. all of the polyfunctional and monofunctional monomers and amounts thereof are selected such that the copolymer would be insoluble in the isoparaffinic hydrocarbon liquid but would be swellable by that liquid.
530531
Alexandrovich Peter S.
Berwick Martin A.
Goebel William K.
Myers Drewfus Y. Jr.
Pearce Glenn T.
Borden Ladner Gervais Llp
Eastman Kodak Company
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