Patent ID: 7381260

Claim:
A trans-thiazineindigo pigment dispersant represented by Formula (1): where: R 1 denotes a group required to form an aromatic or aliphatic carbocyclic ring or a heterocyclic ring which may have a substituent other than the -(E) p - group; R 2 denotes a group required to form an aromatic or aliphatic carbocyclic ring or a heterocyclic ring which may have a substituent other than the -(E) p - group; E denotes a basic group substituted on the carbocyclic ring or heterocyclic ring including R 1 and/or on the carbocyclic ring or heterocyclic ring including R 2 and is represented by Formula (3): X denotes —S—, —O—, —SO 2 —, —SO 2 NR—, —NRSO 2 —, —CH 2 NRCOCH 2 NR— or —(CH 2 ) m NH—, wherein each R independently denotes a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, which may have a substituent, an alkenyl group having 2 to 20 carbon atoms, which may have a substituent, or an aryl group having 6 to 20 carbon atoms, which may have a substituent, and m denotes an integer of 1 to 10; a denotes 0 or 1; Y denotes an alkylene group having 1 to 20 carbon atoms, which may have a substituent, an alkenylene group having 2 to 20 carbon atoms, which may have a substituent, an arylene group having 6 to 20 carbon atoms, which may have a substituent, or a heterocyclic group containing a nitrogen, oxygen or sulfur atom, or two or more of these groups may be bonded together directly or through a linking group selected from —NR—, —O—, —SO 2 — and —CO—, wherein R is as defined above; b denotes 0 or 1; R 3 and R 4 each independently denotes an alkyl group having 1 to 30 carbon atoms, which may have a substituent, or an alkenyl group having 2 to 30 carbon atoms, which may have a substituent, or R 3 and R 4 , taken together, may form a heterocyclic group containing a nitrogen, oxygen or sulfur atom; and p denotes an integer of 1 to 6.