Patent ID: 7446135

Claim:
A dispersant comprising a block copolymer having both a hydrophilic moiety and a hydrophobic moiety and a hydrophobic substituent attached to a terminal end of said hydrophobic moiety, wherein said hydrophilic moiety comprises a repeating unit represented by Formula I below: wherein, R 1 is H or a C 1 -C 6 alkyl group; X is H, a substituted or unsubstituted C 1 -C 20 alkyl group, a C 1 -C 20 alkenyl group, a C 1 -C 20 alkynyl group, a C 1 -C 20 alkoxy group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group or a substituted or unsubstituted C 7 -C 20 arylalkyl group; Y is —OA, —COOA, —SO 2 A, —SO 2 NH 2 , —SO 2 NHCOT 1 , —T 2 SO 3 A, —SO 3 A, —PO 3 NH 2 , —PO 3 A 2 , —NH 2 or —N(T 1 ) 2 , wherein A is a hydrogen atom, an alkali metal, or N(Q 1 )(Q 2 )(Q 3 )(Q 4 ) in which Q 1 , Q 2 , Q 3 or Q 4 each independently represents a hydrogen atom, a C 1 -C 20 alkyl group or a C 6 -C 20 aryl group; T 1 is a C 1 -C 20 alkyl group, a C 6 -C 20 aryl group or a C 2 -C 20 heteroaryl group; T 2 is a C 1 -C 20 alkylene group, a C 6 -C 20 arylene group or a C 2 -C 20 heteroarylene group; and m is an integer of 2 to 150, wherein said hydrophobic moiety comprises a repeating unit represented by Formula II below: wherein R 2 is H or a C 1 -C 6 alkyl group; R 3 is a substituted or unsubstituted C 1 -C 20 alkyl group, a C 1 -C 20 alkenyl group, a C 1 -C 20 alkynyl group, a C 1 -C 20 alkoxy group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group or a substituted or unsubstituted C 7 -C 20 arylalkyl group; Z is H, a substituted or unsubstituted C 1 -C 20 alkyl group, a C 1 -C 20 alkenyl group, a C 1 -C 20 alkynyl group, a C 1 -C 20 alkoxy group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group or a substituted or unsubstituted C 7 -C 20 arylalkyl group; and n is an integer of 2 to 150, wherein the hydrophobic substituent is a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 2 -C 20 heteroaryl group, or a substituted or unsubstituted C 7 -C 20 arylalkyl group, wherein said hydrophobic substituent is included in an amount of 0.05 to 90 parts by weight based on total weight of said dispersant.