Patent ID: 7541075
Filing Date: 2009-06-02
Classification: C08G,C08K,C08L,C09K,G02F

Abstract:
1. A sealant composition for a plastic liquid crystal display cell comprising a one-component epoxy resin composition containing the following (1) to (6), and (I) to (IV): (1) from 15 to 84% by weight of an epoxy resin having from 1.7 to 6 in weight average of epoxy groups in one molecule and an ionic conductivity of an aqueous solution obtained by extraction separation by contact mixing with 10 times by weight of pure water at from 40 to 80° C. of 2 mS/m or less, (2B) from 10 to 50% by weight of a curing agent containing one or a mixture of two or more selected from (2B-1) micro-encapsulated imidazole compounds and (2B-2) methyl methacrylate adducts of alicyclic diamines, having an ionic conductivity of an aqueous solution obtained by extraction separation by contact mixing with 10 times by weight of pure water at from 40 to 80° C. of 0.6 mS/m or less, (3) from 0.01 to 15% by weight of a curing accelerator (4) from 5 to 50% by weight of an inorganic filler, (5) from 0.1 to 5% by weight of a silane coupling agent, and (6) from 1 to 25% by weight of rubbery polymer fine particles having a softening temperature of 0° C. or less and an average particle diameter of primary particles of from 0.01 to 5 μm; and wherein the resin composition has the following properties: (I) when mixed with 10 times by weight water at 40°-80° C. creates a mixture having ionic conductivity of 1 mS/m or less; and, when cured, has: (II) water vapor permeability less than 200 g/m (III) heat deformation temperature (Tg) of 0° to 85° C., and (IV) storage modulus at room temperature of 0.5×10 wherein the epoxy resin (1) is a mixed composition of (1-1) an aliphatic and/or alicyclic epoxy resin and (1-2) an aromatic epoxy resin, and the aliphatic and/or alicyclic epoxy resin (1-1) is selected from the group consisting of: higher alcohol monoglycidyl ether; polyoxyalkylene glycol diglycidyl ether; 1,6-hexanediol diglycidyl ether; neopentyl glycol diglycidyl ether; glycerin triglycidyl ether; and combinations thereof; and the aromatic epoxy resin (1-2) is selected from the group consisting of: bisphenol A type epoxy resins or an alkylene oxide adduct type epoxy resin thereof; a bisphenol F type epoxy resin or an alkylene oxide adduct type epoxy resin thereof; a bisphenol S type epoxy resin; a bisphenol AD type epoxy resin; and combinations thereof; and wherein the curing accelerator (3) is selected from the group consisting of alkyl urea derivative; trisdimethylamino methylphenol salt; 1,8-diazabicyclo(5,4,0)-7-undecene salt; and combinations thereof.