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1. WO2007139980 - POLYMERIC DISPERSANTS

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[ EN ]

What is claimed is:

1. A dispersant which is the reaction product of at least one dianhydride with at least two reactants which are different from each other, each of which reactants contains a primary or secondary amino, hydroxyl or thiol functional group, and at least one of which reactants is polymeria

2. The dispersant of claim 1 in which the dianhydride is of the formula



wherein Q is a carbon-containing linking group.

3. The dispersant of claim 2 in which Q is aromatic, and at least one reactant is an amine-terminated polymer.

4. The dispersant of claim 3 in which all reactants have at least one primary or secondary amino group.

5. The dispersant of claim 3 in which at least one reactant has at least one hydroxyl group.

6. The dispersant of claim 3 in which at least one reactant has at least one thiol group.

7. The dispersant of claim 1 which is a material comprising a unit of the structure

or combination thereof, wherein Q is a carbon-containing linking group; each Xi and X2 are independently NZ, O or S; each Ri, R2 and Z are independently hydrogen or a linear, branched or cyclic aliphatic or aromatic carbon-containing group or a combination thereof, each Vi and V2 independently are hydrogen or the residue of an entity reactive with a -CO2H group, provided that at least one is polymeric; and m is an integer from 1 to 10.

8. The dispersant of claim 7, wherein m is more than 1 and at least two C=O moieties of the dianhydrides are linked by a symmetric or asymmetric difunctional reactant having a primary or secondary amino, hydroxyl or thiol functional group, or a combination thereof.

9. The dispersant of claim 7 wherein Q is arylene, and Xi and X2 are NZ.

10. The dispersant of claim 7 wherein Q is arylene, and one of Xi and X2 is NZ and the other is S or O.

11. The dispersant of claim 7, wherein at least one of Xi-Ri or X2-R2 is a member selected from the group consisting of
poly(oxyalkylene)amino and poly (isobutylene) amino.

12. The dispersant of claim 7, wherein at least one of X1-R1 or X2-R2 is of poly(oxyalkylene) diamine.

13. The dispersant of claim 1 or claim 7 which comprises a unit comprising the structure

or

or mixture thereof wherein Q is a linking group; each X2 is NZ, O or S; and each Ri, R2 and Z are independently hydrogen or a linear, branched or cyclic aliphatic or aromatic carbon containing group or a combination thereof, and each V2 independently is hydrogen or the residue of an entity reactive with a -CO2H group, provided that at least one is polymeric; and m is an integer from 1 to 10.

14. The dispersant of claim 13, wherein m is more than 1 and at least two C=O moieties of the dianhydrides are linked by a difunctional reactant having a primary or secondary amino, hydroxyl or thiol functional group, or combination thereof.

15. The dispersant of claim 13 wherein Q is arylene, and Xi and

X2 are NZ.

16. The dispersant of claim 13, wherein at least one of Xi-Ri or X2-R2 is a member selected from the group consisting of
poly(oxyalkylene)amino and poly (isobutylene) amino.

17. The dispersant of claim 13 wherein Q is arylene, and one of Xi and X2 is NZ and the other is S or O.

18. The dispersant of any one of claims 1 to 17 in combination with a pigment.

. 19. The dispersant of any one of claims 1 to 17 in combination with a pigment and with at least one of a solvent, ink vehicle, coating vehicle or plastic.

20. The dispersant of any one of claims 1 to 17 in combination with a pigment and an ink jet vehicle.

21. A method of preparing the dispersant of any one of claims 1 to 17 which comprises reacting at least one dianhydride with at least two reactants which are different from each other in a substantially anhydrous solvent, wherein each reactant comprises at least one functional group independently selected from the group consisting of amine, hydroxyl and thiol, and at least one of which reactants is polymeric.

22. A method of dispersing a pigment which comprises combining a liquid or plastic material, pigment and dispersant of any one of claims 1 to 17.

23. A process which comprises heating a pigmented composition containing a dispersant of any one of claims 1 to 17 above about 70°C.

24. A substrate having the combination of any one of claims 18 to 20 on at least one surface thereof.

25. An article comprising the substrate of claim 24.

26. A process of coloring a surface of a substrate which comprises applying the combination of any one of claims 18 to 20 on the surface.