Patent ID: 7572491
Filing Date: 2009-08-11
Classification: C08G,C08L,C09J,C09K

Abstract:
1. An electrophoretic display comprising display cells, wherein said display cells are sandwiched between two electrode layers, filled with a display fluid comprising charged pigment particles dispersed in a dielectric solvent and top-sealed with a top-sealing layer formed from a sealing composition comprising a functionalized polyurethane and a radiation curable composition and said top-sealing layer has a thickness of about 1 micron to about 8 microns, and said functionalized polyurethane has a dielectric constant in a range of about 3 to 15 measured at 18° C. to 27° C. and at 60 Hz, which is higher than that of the dielectric solvent, and has a functional group selected from a group consisting of —OH, —SH, —NCO, —NCS, —NHR, —NRCONHR, —NRCSNHR, and epoxide, wherein R is hydrogen, alkyl, aryl, alkylaryl or arylalkyl of up to 20 carbon atoms.