Patent ID: RE44769

Claim:
A dispersant of general Formula 1 T—(A) n (B) p —Z (1) wherein T is hydrogen or a polymerisation terminating group; Z is an acidic or basic group or a moiety containing either an acidic or basic group where the basic group or moiety containing the basic group represented by Z is attached to T—(A) n (B) p — by an amide and/or salt link and where the acidic group is selected from sulphate, sulphonate, phosphate and phosphonate; A and B are each, independently, oxyalkylene carbonyl groups derived from δ-valerolactone , or ε-caprolactone or alkyl substituted ε-caprolactone provided that both are not ε-caprolactone or δ-valerolactone , the group —(A) n (B) p — being derived from the copolymerisation of δ-valerolactone and ε-caprolactone ; n and p are integers; and n+p is from 2 to 100; including salts thereof.