Patent ID: 7758933

Claim:
A pressure-sensitive adhesive system comprising a first optically transparent substrate bonded to a second optically transparent substrate with pressure-sensitive adhesive, wherein the first optically transparent substrate is a film adapted to be used with a liquid-crystal-based display module and the second optically transparent substrate is the liquid-crystal-based display module, wherein the pressure-sensitive adhesive is based on at least 50% of one or more block copolymers, at least one block copolymer being composed at least in part on the basis of (meth)acrylic acid derivatives, the at least one block copolymer comprising at least the unit P(A)-P(B)-P(A), comprising at least one polymer block P(B) and at least two polymer blocks P(A), where P(A) independently of one another represent homopolymer or copolymer blocks made up of monomers of group A, the (co)polymer blocks P(A) each having a softening temperature in the range from 0° C. to +175° C., P(B) represents a homopolymer or copolymer block comprising monomers of group B, the (co)polymer block P(B) having a softening temperature in the range from −130° C. to +10° C., and the (co)polymer blocks P(A) and P(B) are not homogeneously miscible with one another at 25° C., and wherein the pressure sensitive adhesive has a refractive index n d,a of n d,a ≧1.52 at 25° C., at least one of the (co)polymer blocks P(A) has a refractive index n d,A of n d,A ≧1.58 at 25° C., and the (co)polymer block P(B) has a refractive index n d,B of n d,B ≧1.43 at 25° C.