Patent ID: 7144928

Claim:
A UV-transparent pressure sensitive adhesive having a UV transparency at 300 nm of more than 95%, comprising: (a) a copolymer of (a1) from 75 to 99.8% by weight of acrylic esters and/or methacrylic esters of the formula CH 2 ═CH(R 1 )(COOR 2 ), where R 1 is H or CH 3 and R 2 is an alkyl chain having 1 to 20 carbon atoms; (a2) from 0 to 10% by weight of acrylic acid and/or methacrylic acid of the formula CH 2 ═CH(R 1 )(COOH), where R 1 is H or CH 3 ; (a3) from 0.2 to 5% by weight of olefinically unsaturated monomers which contain at least one UV-crosslinking functional group per monomer; and (a4) from 0 to 20% by weight of olefinically unsaturated monomers which are different than the olefinically unsaturated monomers (a3) and which contain at least one functional group per monomer; said copolymer having a molecular weight Mw of less than 300,000 g/mol and (b) from 2 to 20% by weight, based on the weight of the copolymer, of a silicate filler, the silicate filler having a maximum particle diameter of 50 nm; the U-V-transparent pressure sensitive adhesive having a residual solvent fraction of less than 1%, based on the weight of the U-V transparent pressure sensitive adhesive.