| 摘要 |
A contact adhesive system having a predetermined property profile without additional crosslinking which remains constant over time can be obtained when the system is oriented, i.e. has a preferred direction, and the refractive is higher in this direction than in that at right angles to it. <??>A contact adhesive system containing a contact adhesive composition based on at least one block copolymer where the wt. proportion of the block copolymer is at least 50% of the composition, at least one block copolymer is at least partially based on (meth)acrylic acid derivatives and at least one block copolymer has at least one unit P(A)-P(B)-P(A) from at least one polymer block P(B) and at least two polymer blocks P(A), where P(A) is a homo or copolymer block of monomers A, and polymer block P(A) has a softening temperature in the region of +20 degrees C to +175 degrees C, P(B) is a homo or copolymer from monomers, where the polymer block P(B) has a softening temperature in the region of -130 degrees C to +10 degrees C, and polymer blocks P(A) and P(B) are not homogeneously miscible. The contact adhesive system is oriented, i.e. it has a preferred direction, and the refractive nMD is higher in this direction than in that at right angles to it nCD. An Independent claim is also included for preparation of the composition as above but coated from the melt (sic). |
