| abstract |
The invention provides a co-polymer having a hub portion from which radiate from 3 to 8 arms where the hub portion is the residue of a tri-functional to octa-functional thiol and each arm is an addition polymer comprising structural units and functional units that are mutually compatible, the functional units including crosslinking substituents capable of undergoing a crosslinking reaction with a crosslinking agent or the same or a complimentary substituent in functional units in another molecule of the same polymer and optionally compatible auxiliary functional units that contain wetting groups. |