Modified colorants and inkjet ink compositions comprising modified colorants
AssigneeCabot Corporation
InventorsFeng Gu, James A. Belmont, Elizabeth G. Burns, Paul S. Palumbo, Barry B. Corden, Yuan Yu, Ervina Halim
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Abstract
The present invention relates to a modified colorant comprising a colorant having attached at least one organic group. Various embodiments of the organic group are disclosed. For each of these embodiments, preferably the organic group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions.
Claims31
A modified colorant comprising a colorant having attached at least one organic group, wherein the organic group has a calcium index value greater than a calcium index value of 1,2,3-benzene tricarboxylic acid, wherein the colorant is a pigment and wherein the organic group comprises at least one group selected from:
- (i) at least one hydroxamic acid group or salt thereof selected from at least one hydroxy pyridonyl group and at least one hydroxy quinolonyl group;
- (ii) at least one heterocyclic group having at least one OH group or salt thereof;
- (iii) at least one phosphonic acid group or a salt thereof and at least one second ionic, ionizable, or basic group vicinal or geminal to the phosphonic acid group or salt thereof;
- (iv) a heteroaryl group having at least one carboxylic acid group or salt thereof;
- (v) an aryl group having at least one nitroso group and at least one OH group or a salt thereof;
- and
- (vi) an azoarene group having at least two OH groups, at least two NH2 groups, or at least one OH group and at least one NH2 group and has the formula Ar1—N═N—Ar2, wherein Ar1 and Ar2, which can be the same or different, are an arylene group or an aryl group and at least one of Ar1 or Ar2 is an arylene group.
A modified colorant comprising a pigment having attached at least one organic group, wherein the organic group comprises
- i) at least one hydroxamic acid group or salt thereof selected from at least one hydroxy pyridonyl group and at least one hydroxy quinolonyl group,
- ii) at least one phosphonic acid group or salt thereof and at least one second ionic, ionizable, or basic group, or
- iii) an aryl group having at least one nitroso group and at least one OH group or a salt thereof.
A modified colorant comprising a pigment having attached at least one organic group, wherein the organic group comprises
- i) at least one heterocyclic group having at least one OH group or salt thereof,
- ii) at least one heteroaryl group having at least one carboxylic acid group or salts thereof, or
- iii) an azoarene group has at least one OH group, at least one NH2 group, or one OH group and one NH2 group and has the formula Ar1—N═N—Ar2, wherein Ar1 and Ar2, which can be the same or different, are an arylene group or an aryl group and at least one of Ar1 or Ar2 is an arylene group.
A modified colorant comprising a pigment having attached at least one organic group and at least one second organic group, wherein the organic group has a calcium index value greater than a calcium index value of phenylphosphonic acid and wherein the second organic group is a polymeric group.
Dependencies are inferred from the claim text.