Aqueous pigment dispersions with components to interact with cellulose
View Patent ↗Aqueous pigment dispersions having components in the dispersant capable of interacting with cellulose are described. These components include a heterocycle substituted to the oxygen atom of an acrylate ester. The heterocycle is selected based on its Hansen solubility parameters.
1. An aqueous pigment dispersion comprising a dispersed pigment, an aqueous carrier and a polymeric dispersant; wherein said polymeric dispersant is a random or structured polymer and comprising at least three monomers A, B and C; wherein monomer A is a hydrophobic acrylate monomer, monomer B is a hydrophilic acrylic monomer, and monomer C is an acrylate monomer with the O atom on the ester bonding, either directly or via a linking group containing 1-10 carbon atoms, to a carbon or heteroatom of a monocylic or bicyclic heterocycle containing N, S or O atoms on the ring, wherein said heterocycle is selected from the group consisting of imidazole, oxazolidinone, thiazolidinone, benzimidazole, triazole, thiazole, benzothiazole, pyrimidine, pyridazine and glycoside, and wherein the carbon atoms on the ring of said heterocycle are optionally substituted with one or more R 1 , OR 2 , SR 2 or NR 3 R 4 , and the N atom or atoms on the ring of said heterocycle are optionally substituted with R 1 or —R 5 OR 2 ;
each R 1 is independently C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl or C 6 -C 40 aryl;
each R 2 is independently H, C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl or C 6 -C 40 aryl; and
each R 3 and R 4 are independently H, C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl or C 6 -C 40 aryl; and
each R 5 is C 1 -C 5 alkyl.
2. The aqueous pigment dispersion of claim 1 wherein the polymeric dispersant has between 10 to 80 weight % of monomer A, between 5 to 50 weight % of monomer B and between 5 to 50 weight % of monomer C.
3. The aqueous pigment dispersion of claim 1 wherein said heterocycle is imidazole.
4. The aqueous pigment dispersion of claim 1 wherein said heterocycle is oxazolidinone.
5. The aqueous pigment dispersion of claim 1 wherein said heterocycle is thiazolidinone.
6. The aqueous pigment dispersion of claim 1 wherein said heterocycle is benzimidazole.
7. The aqueous pigment dispersion of claim 1 wherein said heterocycle is triazole.
8. The aqueous pigment dispersion of claim 1 wherein said heterocycle is thiazole.
9. The aqueous pigment dispersion of claim 1 wherein said heterocycle is benzothiazole.
10. The aqueous pigment dispersion of claim 1 wherein said heterocycle is pyrimidine.
11. The aqueous pigment dispersion of claim 1 wherein said heterocycle is pyridazine.
12. The aqueous pigment dispersion of claim 1 wherein said heterocycle is glycoside.