Patent ID: 6703441
Filing Date: 2004-03-09
Classification: C08F,C08L,C09J,Y10T

Abstract:
A pressure sensitively adhesive system comprising a pressure sensitive adhesive which is comprised of at least one block copolymer, the weight fraction or fractions of said at least one block copolymer totaling at least 50% of the pressure sensitive adhesive, wherein if said at least one block copolymer is one block copolymer, said one block copolymer is formed at least in part of (meth)acrylic acid derivatives and comprises the unit P(A)-P(B)-P(A), and wherein if said at least one block copolymer is more than one block copolymer at least one of said more than one block copolymers is formed at least in part of (meth)acrylic acid derivatives, and at least one of said more than one block copolymers comprises at least the unit P(A)-P(B)-P(A), said unit P(A)-P(B)-P(A) comprising at least one polymer block P(B) and at least two polymer blocks P(A), whereP(A) independently of one another represent homopolymer blocks or copolymer blocks of monomers A, the polymer blocks P(A) each having a softening temperature in the range from +20Â° C. to +175Â° C., P(B) represents a homopolymer block or copolymer block of monomers B, the polymer block P(B) having a softening temperature in the range from âˆ’130Â° C. to +10Â° C., the polymer blocks P(A) and P(B) are not homogeneously miscible with one another, wherein the pressure sensitively adhesive system is oriented, possessing a preferential direction, with the refractive index nMD measured in the preferential direction being greater than the refractive index nCD measured in a direction perpendicular to the preferential direction.