ORIENTED ACRYLIC BLOCK COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive based on an oriented acrylic block copolymer. SOLUTION: The pressure sensitive adhesive based on the block copolymer is brought to be included in a pressure sensitive adhesive system in 50 wt.%. The block copolymer is constituted of a (meth)acrylic acid derivative as a base. Additionally, a unit P(A)-P(B)-P(A) [-P(A) expresses independently a homopolymer block or a copolymer block made of the monomer A and each having +20°C to +175°C softening temperature; -P(B) expresses a hompolymer block or an copolymer block made of the monomer (B) and each having -130°C to +10°C softening temperature; the polymer blocks P(A) and P(B) are not homogeneously compatible with each other] containing at least one polymer block P(B) and at least two polymer blocks P(A) (2) is brought to be included in the pressure sensitive adhesive system. The adhesive system is oriented to have an advantageous direction and the refractive index nMD in the advantageous direction is brought to be higher than the refractive index nCD in the direction cross to the advantageous direction. COPYRIGHT: (C)2003,JPO