DESCRIZIONE
The present invention provides a copolymer comprising repeat units of formulae (A), (B1) and/or (B2) and optionally (C): [Image Omitted] [Image Omitted] wherein
in formula (A)
R is selected from H and C1-6 alkyl;
X1 is selected from COO, CONH and OCO;
m is 0 or 1;
R1 is selected from substituted or unsubstituted, linear or branched, C1-8 alkylene;
n is 0 or 1; and
R2 is a substituted or unsubstituted heterocyclyl, NRxRy, NHCORx or CONRxRy,
wherein Rx and Ry are independently selected from substituted or unsubstituted, linear or branched, C1-8 alkyl,
in formulae (B1) and (B2)
R is selected from H and C1-6 alkyl;
X2 is selected from COOR3 and OCOR3;
o is 0 or 1;
R3 is selected from substituted or unsubstituted, linear or branched, C1-8 alkylene;
each R4 is independently selected from C1-10 alkyl and C5-10 aryl;
in formula (B1)
q is an integer from 1 to 160,
and in formula (B2)
q is 0 or an integer from 1 to 80,
R5 is selected from C1-10 alkyl, C5-10 aryl or O-Si(R6)3, wherein R6 is independently selected from C1-10 alkyl and C5-10 aryl; and
in formula (C):
R is selected from H and C1-6 alkyl; and
X3 is selected from COOH, COOR7, OCOR7,OH or OR7 wherein R7 is selected from substituted or unsubstituted, linear or branched, C1-8 alkyl;
wherein said copolymer comprises 1-40 wt% of repeat unit (A), a total of 10-90 wt% of repeat units (B1) and/or (B2) and 0 to 70 wt% of repeat unit (C).