Aqueous dispersions containing cyclopolymer dispersants

• US 5,571,850 A
• Filed: 01/25/1996
• Issued: 11/05/1996
• Est. Priority Date: 07/30/1993
• Status: Expired due to Fees

• Current Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education), E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Ma, Sheau-Hwa, Moad, Graeme, Rizzardo, Ezio, Thang, San Hoa
• Primary Examiner(s): YOON, TAE H
• Application Number:
  US08/586,852
• Time in Patent Office: 285 Days
• Field of Search: 523/160, 523/161, 524/499, 524/571, 106/20 D, 106/23 C
• US Class Current: 523/160
• CPC Class Codes: C07C 69/604 Polycarboxylic acid esters, the acid moiety containing more than two carboxyl groups
• CPC Class Codes: C07C 69/618 having unsaturation outside the six-membered aromatic ring
• CPC Class Codes: C07C 69/65 of unsaturated acids
• CPC Class Codes: C07D 239/62 Barbituric acids
• CPC Class Codes: C07D 319/06 not condensed with other rings
• CPC Class Codes: C07F 9/4015 Esters of acyclic unsaturated acids
• CPC Class Codes: C08F 36/20 unconjugated
• CPC Class Codes: C09D 11/326 characterised by the pigment dispersant

Abstract

Aqueous dispersions which are particularly well suited for use as aqueous jet ink compositions having an aqueous carrier medium which comprises water or a mixture of water and at least one organic solvent, a particulate solid, preferably a pigment, and a cyclopolymer dispersant.

Claims

1. A dispersion comprising an aqueous carrier medium, a particulate solid, and a cyclopolymer dispersant consisting essentially of at least one cyclopolymer having the formula:

##STR4## with the proviso that either (i) R₁ and R₂ are hydrophobic groups, and X and Y are hydrophilic groups, or (ii) R₁ and R₂ are hydrophilic groups, and X and Y are hydrophobic groups; and

n is selected such that the weight average molecular weight of the cyclopolymer is in the range of 1,000 to 50,000.

2. The dispersion of claim 1 wherein R₁ and R₂ are hydrophobic groups independently selected from the groups consisting of COOR, CN, C(O)NHR₄ and C(O)NR₅ R₆ wherein R, R₄, R₅, and R₆ are independently selected from the group consisting of alkyl, substituted alkyl, aryl, or substituted aryl groups having 1 to 18 carbon atoms, wherein the substituted group is a substituent that does not interfere with the polymerization process.

3. The dispersion of claim 2 wherein X and Y are hydrophilic groups independently selected from the group consisting of COOH, PO₃ H, SO₃ H, COOR₇, C(O)NHR₈, C(O)NR₉ R₁₀, and R₁₁ CO wherein R₇, R₈, R₉, R₁₀ and R₁₁ are independently selected from the group consisting of alkyl, aryl, aralkyl or alkylaryl group containing 1 to 30 carbon atoms and sufficient hydrophilic groups to render X and Y as a whole hydrophilic.

4. The dispersion of claim 1 wherein R₁ and R₂ are hydrophilic groups independently selected from the group consisting of COOH, COOR₇, C(O)NHR₈, and C(O)NR₉ R₁₀ wherein R₇, R₈, R₉ and R10 are independently selected from the group consisting of alkyl, aryl, aralkyl or alkylaryl group containing 1 to 30 carbon atoms and sufficient hydrophilic groups to render the R₁ and R₂ as a whole hydrophilic.

5. The dispersion of claim 4 wherein X and Y are hydrophobic groups independently selected from the group consisting of COOR, CN, R₃ CO, C(O)NHR₄, and C(O)NR₅ R₆ wherein R, R₄, R₅, and R₆ are independently selected from the group consisting of alkyl, substituted alkyl, aryl, or substituted aryl groups having 1 to 18 carbon atoms and R₃ is an alkyl group containing 1 to 6 carbon atoms, wherein the substituted group is a substituent that does not interfere with the polymerization process.

6. The dispersion of claim 1 wherein said particulate solid is a pigment.

7. The dispersion of claim 6 wherein said pigment has a particle size in the range of 0,005 to 15 microns.

8. The dispersion of claim 1 wherein said dispersion is an ink jet ink containing 70 to 96% aqueous carrier medium, up to 30% by weight of an organic pigment, up to 75% by weight of an inorganic pigment, and 0.1 to 30% by weight cyciopolymer dispersant.

9. The dispersion of claim 1 containing at least one additive selected from the group consisting of organic solvents, polymeric binders, water-soluble polymers, water-dispersible latex emulsions, thickeners, coalescing agents, surfactants, biocides, sequestering agents, thixotropic agents and coating aids.