Patent ID: 7521519

Claim:
An amphiphilic block copolymer of formula wherein A is a hydrophobic polysiloxane or perfluoroalkyl polyether segment; B is a surface-modifying hydrophilic segment having a weight average molecular weight of ≧100 that is devoid of a crosslinkable group; Q is a moiety comprising at least one crosslinkable ethylenically unsaturated group; (alk) is C 2 -C 20 -alkylene which is unsubstituted or substituted by hydroxy; L 1 , L 2 and L 3 are each independently of the other a linking group; p1 and q1 are each independently of the other an integer from 1 to 12; and either t is 0 and p and q are each independently of the other an integer from 2 to 20; or t is an integer from 1 to 8 and p and q are each 0.