| abstract |
A compound of general formula I ** (See formula) ** wherein R1, R2, R3, R4, R7 and R8 are independently selected from hydrogen, C1-C4 alkyl, C1-C2 alkanol or hydroxyl; A is O, O (CH2CH2O) v or [SiR5R6O] wSiR5R6, wherein R5 and R6 are independently selected from C1-C4 alkyl or phenyl, and v is 1 to 20 and w is 0 to 60; m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6; and X and Y are independently selected from O or NR9, where R9 is hydrogen, C1-C4 alkyl, or C1-C2 alkanol. |