ELECTROPHORETIC PARTICLES AND PROCESSES FOR THE PRODUCTION THEREOF
First Claim
Patent Images
1. A process for producing a polymer-coated pigment particle, which process comprises:
- (a) reacting the particle with a reagent having a functional group capable of reacting with, and bonding to, the particle, and also having a group which provides an initiating site for atom transfer radical polymerization, thereby causing the functional group to react with the particle surface and attach the initiating site thereto; and
(b) reacting the product of step (a) with at least one monomer or oligomer capable of undergoing atom transfer radical polymerization under conditions effective to cause such polymerization, thereby causing the formation of polymer bonded to the particle.
0 Assignments
0 Petitions
Accused Products
Abstract
Polymer-coated pigment particles produced using atom transfer radical polymerization provide electrophoretic media having improved bistability without requiring addition to the electrophoretic fluid of additives which increase switching time.
-
Citations
35 Claims
-
1. A process for producing a polymer-coated pigment particle, which process comprises:
-
(a) reacting the particle with a reagent having a functional group capable of reacting with, and bonding to, the particle, and also having a group which provides an initiating site for atom transfer radical polymerization, thereby causing the functional group to react with the particle surface and attach the initiating site thereto; and (b) reacting the product of step (a) with at least one monomer or oligomer capable of undergoing atom transfer radical polymerization under conditions effective to cause such polymerization, thereby causing the formation of polymer bonded to the particle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A process for producing a polymer-coated pigment particle, which process comprises:
-
(a) reacting the particle with a reagent having a functional group capable of reacting with, and bonding to, the particle, and also having a polymerizable or polymerization-initiating group, thereby causing the functional group to react with the particle surface and attach the polymerizable group thereto; and (b) reacting the product of step (a) with at least one monomer or oligomer under conditions effective to cause reaction between the polymerizable or polymerization-initiating group on the particle and the at least one monomer or oligomer, thereby causing the formation of polymer bonded to the particle, the at least one monomer or oligomer comprising at least one atom transfer radical polymerizable initiating monomer; and (c) stopping the polymerization of step (a), and thereafter treating the particle with at least one monomer or oligomer capable of undergoing atom transfer radical polymerization under conditions effective to cause such polymerization, thereby causing the formation of additional polymer attached to the particle. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A process for producing a polymer-coated pigment particle, which process comprises:
-
(a) reacting the particle with a reagent having a functional group capable of reacting with, and bonding to, the particle, and also having a polymerizable or polymerization-initiating group, thereby causing the functional group to react with the particle surface and attach the polymerizable group thereto; (b) reacting the product of step (a) with at least one monomer or oligomer under conditions effective to cause reaction between the polymerizable or polymerization-initiating group on the particle and the at least one monomer or oligomer, thereby causing the formation of polymer bonded to the particle; (c) reacting the product of step (b) with at least one monomer or oligomer comprising at least one atom transfer radical polymerizable initiating monomer under conditions effective to cause attachment of the monomer or oligomer to the particle; and (d) reacting the product of step (b) with at least one monomer or oligomer capable of undergoing atom transfer radical polymerization and different from the monomer or oligomer used in step (c), under conditions effected to cause the monomer or oligomer to undergo atom transfer radical polymerization and become attached to the particle. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
Specification