| 摘要 |
PROBLEM TO BE SOLVED: To prepare an optical tacky adhesive compsn. which can prevent light leakage by incorporating a plasticizer and a crosslinking agent into a tacky adhesive based on an acrylic resin. SOLUTION: A crosslinking agent, such as a polyisocyanate compd., is added in an amt. of 0.001 to 10 pts.wt. (hereinafter referred to as 'pts.') to 100 pts. copolymer, having a wt.-average mol.wt. of 1,200,000 to 1,500,000, prepd by copolymerizing about 50 to 98wt.% (hereinafter referred to as '%') alkyl (meth) acrylate with about 2 to 50% other polymerizable monomer, such as a carboxyl- contg. monomer, a hydroxyl-contg. monomer, or an amide-contg. monomer, to prepare an acrylic resin (A). Similarly, a crosslinking agent is added to a copolymer having a wt.-average mol.wt. of 500,000 to 900,000 to prepare an acrylic resin (B). Subsequently, the acrylic resin (A) and the acrylic resin (B) are mixed together in a wt. ratio of (6:4) to (4:6), and a predetermined amt. of a plasticizer, such as a phthalic ester, is added thereto, followed by kneading. A solvent, such as methyl ethyl ketone, is added to dilute the kneaded product so that the nonvolatile content is about 10 to 20%, thus preparing an optical tacky adhesive compsn. based on an acrylic resin. |
