Nippon Carbide Industries Co., Inc.

Shuhei Masuda

Hiroto Nakano

Naomi Furue

Akira Kamoi

Shinya Hattori

Hideki Miyazaki

Masahito Saito

Yasuhisa Hagiwara

A pressure-sensitive adhesive composition which is excellent in durability under high temperature and humidity conditions and can thus inhibit bright defect even when applied to a large-sized optical film; a pressure-sensitive adhesive; and an optical film. A pressure-sensitive adhesive composition including an acrylic copolymer (A) bearing a reactive functional group, an acrylic copolymer (B) and an isocyanate compound (C), wherein the quantity of the isocyanate compound (C) is 5 to 30 parts by weight per 100 parts by weight of a mixture of the acrylic copolymer (A) and the acrylic copolymer (B) and the elongation at break and 200% modulus as determined at 25 degrees C. by the tensile test are 300 to 1000% and 0.2 to 3 N/mmrespectively.

Pressure-sensitive adhesive composition, pressure-sensitive adhesive and optical film

Provided is an adhesive composition for polarizing plates, which is used for adhering polarizing plates, and which exhibits excellent durability even under high-temperature and high-moisture conditions, and which minimizes the occurrence of white streaks. Also provided are a polarizing plate with adhesive and liquid crystal display device using said adhesive composition. The adhesive composition for polarizing plates contains the following: (A) carboxyl group [CG]-containing (meth)acrylic copolymer [MACP] using 1.5 to 3 wt % CG-containing (meth)acrylic monomer [MAM] and 97 to 98.5% MAM not having a reactive functional group; (B) CG- and hydroxyl group [HG]-containing MACP using 0.5 to 3 wt % CG-containing MAM, 0.3 to 1 wt % HG-containing MAM, and 96 to 99.2 wt % MAM not having a reactive functional group; (C) toluene diisocyanate-type isocyanate compound; and (D) a silane coupling agent. The respective weight average molecular weight of (A) and (B) fall within the range of 950,000 to 1,050,000, the weight ratio of (A)/(B) falls within the range of 70/30 to 90/10, and (C) is contained in a ratio of 10 to 20 parts by weight with respect to 100 parts by weight of the total weight of MACP.

Adhesive composition for polarizing plates, polarizing plate with adhesive using same, and liquid crystal display device using same

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Tochigi, Japan

Shuhei Masuda