Patent ID: 6458966
Filing Date: 2002-10-01
Classification: C09B

Abstract:
A dye having the formula whereinn represents 0, 1 or 2, B1 represents H, or â€ƒrepresents C1-C10 alkyl, aryl or aralkyl, each of which is either unsubstituted or substituted by a group to modify solubility, or a group to modify electronic and/or spectral properties, or a functional linking group, or Cl, Br or F, B2 and B3 independently represent C1-C10 alkyl, aryl or aralkyl, each of which is either unsubstituted or substituted by a group to modify solubility, or a group to modify electronic and/or spectral properties, or a functional linking group, B1 and B2 and/or B1 and B3 may be linked to form a one or two fused ring system, each ring containing 5 or 6 atoms, which is carbocyclic or heterocyclic, wherein said system can be either aromatic or aliphatic which is unsubstituted or substituted by a group to modify solubility, or a group to modify electronic and/or spectral properties, or a functional linking group; R1 represents â€”RaRb, where Ra is C1-C10 alkylene or aralkylene which may optionally contain 1 to 4 oxygen, nitrogen or sulphur atoms in a straight or branched chain, and Rb is carboxy, R2, R3, R4 and R5 independently represent H; or â€ƒC1-C10 alkyl or aralkyl which may optionally contain 1 to 4 oxygen, nitrogen or sulphur atoms in a straight or branched chain; or â€ƒRc where Rc is a group to modify solubility, or a group to modify electronic and/or spectral properties, or a functional linking group; or â€ƒâ€”RaRc wherein Ra and Rc are herein defined as above, or R4â€”R5 or R2â€”R4 or R2-R3 are linked to form a single six membered ring system, which is carbocyclic or heterocyclic, wherein said system can be either aromatic or aliphatic which is unsubstituted or substituted by a group to modify solubility, or a group to modify electronic and/or spectral properties, or a functional linking group.