Abstract: The disclosed a pressure sensitive adhesive for polarizing plates which has a storage elastic modulus (G?) at 23° C. of at least 0.3 MPa; a polarizing plate having a pressure sensitive adhesive; a process for producing the above polarizing plate which comprises sticking a polarizing plate on a tacky adhesive material layer formed on a releasing layer of a releasing sheet, and thereafter irradiating with an active energy beam from the releasing sheet side; an optical film which comprises a polarizing plate and a phase difference plate; and a process for producing the above optical film. The pressure sensitive adhesive and polarizing plate having the pressure sensitive adhesive are characterized in that they are capable of sticking with high durability, the polarizing plate to a and phase difference plate, and the resultant liquid crystal display unit is less liable to cause light leakage under the conditions of high temperature.

Abstract: There is disclosed pressure sensitive adhesive composition for polarization films use in the case of pasting the polarization films by means of crossed Nicols at ?0 and 90 degrees to the front and rear sides of a liquid crystal cell which composition comprises an acrylic copolymer (A) of a(meth) acrylic ester and a monomer having a cross-linkable functional group in the molecule each as a monomer component and a cross-linking agent (B), wherein the storage elasticity of the composition after cross-linking at 0 to 50° C. is in the range of 105 to 109 Pa, and the glass transition temperature (Tg) thereof is minus 20° C. or higher. The pressure sensitive adhesive composition is capable of providing optically functional films which are imparted with very excellent light leakage resistance without the occurrence floating peeling of films under the condition of high temperature and high humidity, when used for pasting polarization films by means of crossed Nicols at ?0 and 90 degrees.

Abstract: There are disclosed a pressure-sensitive adhesive for polarizing plates which is formed by irradiating a pressure-sensitive adhesive material with an active energy beam, the material containing an acrylic copolymer (A) and an acrylic copolymer bearing an active energy beam-polymerizable group on a side chain (B), and which has a storage elastic modulus (G?) at 23 ° C. in the range of 0.3 to 10 MPa: a polarizing plate which is having a pressure-sensitive adhesive, and which comprises a layer composed of the above pressure-sensitive adhesive; and a process for the production of the polarizing plate having a pressure-sensitive adhesive, which comprises sticking a polarizing plate on a pressure-sensitive adhesive material layer formed on a releasing layer of a releasing sheet, and thereafter irradiating the polarizing plate with an active energy-beam from the releasing sheet side.

Abstract: The disclosed a pressure sensitive adhesive for polarizing plates which has a storage elastic modulus (G?) at 23° C. of at least 0.3 MPa; a polarizing plate having a pressure sensitive adhesive; a process for producing the above polarizing plate which comprises sticking a polarizing plate on a tacky adhesive material layer formed on a releasing layer of a releasing sheet, and thereafter irradiating with an active energy beam from the releasing sheet side; an optical film which comprises a polarizing plate and a phase difference plate; and a process for producing the above optical film. The pressure sensitive adhesive and polarizing plate having the pressure sensitive adhesive are characterized in that they are capable of sticking with high durability, the polarizing plate to a and phase difference plate, and the resultant liquid crystal display unit is less liable to cause light leakage under the conditions of high temperature.

Abstract: A pressure sensitive adhesive composition for polarization films used for the front and rear sides of a liquid crystal cell of a system such as IPS (In-Plane Switching), MVA (Multi-Domain Alignment) and the like. The pressure sensitive adhesive composition is made up of: 1) an acrylic copolymer of a (meth)acrylic ester and a monomer having a crosslinkable functional group; and 2) a crosslinking agent; where the storage elasticity of the composition after crosslinking at 0 to 50° C. is in the range of 105 to 109 Pa, and the glass transition temperature (Tg) is ?20° C. or higher. The pressure sensitive adhesive composition provides optically functional films imparted with excellent light leakage resistance. Films adhered with the pressure sensitive adhesive composition do not experience floating peeling under conditions of high temperature and high humidity when the composition is used for pasting polarization films by means of crossed Nicols at ?0 and 90 degrees.