Pressure sensitive adhesive, particularly for apolar surfaces

Abstract

A pressure sensitive adhesive based on block copolymers, said block copolymers having at least one unit composed of three successive polymer blocks, said three successive polymer blocks being chosen in alternation from the group of the polymer blocks P(A) and P(B), wherein P(A) represents a homopolymer or copolymer block obtainable from a component A which is composed of at least two monomers A1, A2, the polymer block P(A) having a softening temperature of from −80° C. to 0° C., at least one (A1) of the monomers of component A is an acrylic or methacrylic acid derivative of the general formula CH2═CH(RI)(COORII)  (I) in which RI═H or CH3 and RII is an aliphatic, linear, branched or cyclic, unsubstituted or substituted, saturated or unsaturated, alkyl radical having from 1 to 20 carbon atoms, at least one further (A2) of the monomers of component A is an acrylated macromonomer of the general formula CH2═CH(RIII)(COORIV)  (II) in which RIII═H or CH3 and RIV is an aliphatic, linear, branched or cyclic, unsubstituted or substituted, saturated or unsaturated alkyl radical having more than 30 carbon atoms, and the average molecular weight Mn of said at least one macromonomer is between 492 g/mol and 30 000 g/mol, P(B) represents a homopolymer or copolymer block obtainable from a component B which is composed of at least one monomer B1, the polymer block P(B) having a softening temperature of from 20° C. to 175° C., and the polymer blocks P(A) are not homogeneously miscible with the polymer blocks P(B).

Dependencies are inferred from the claim text.