# US 10,767,070 B2 · Process for preparing multi-color dispersions and multi-color dispersions made thereof

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- Number: US 10,767,070 B2
- Document ID: US10767070B2
- Status: Granted
- Kind: B2
- Application number: 14/403,695
- Filed: 2012-06-06
- Published: 2015-05-28
- Granted: 2020-09-08
- Earliest claimed: 2012-06-06
- Assignees: Dow Global Technologies LLC; Rohm and Haas Company
- Applicants: Dong Yun; Yujiang Wang; Jian Sun; Peng Xu; Fei Guo
- Inventors: Dong Yun; Yujiang Wang; Jian Sun; Peng Xu; Fei Guo
- Web page: https://patentgrep.com/patent/US10767070B2

## CPC

- C09D 7/41: Organic pigments; Organic dyes
- C09B 67/0013: {with polymeric coatings}
- C09B 67/0033: {Blends of pigments; Mixtured crystals; Solid solutions}
- C09B 67/0085: {Non common dispersing agents}
- C09D 7/61: inorganic
- C09D 17/001: {in aqueous medium (C09D17/003, C09D17/004 take precedence)}
- C09D 17/002: {in organic medium (C09D17/003, C09D17/004 take precedence)}
- C09D 105/00: Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
- C09D 105/04: Alginic acid; Derivatives thereof
- C09D 189/00: Coating compositions based on proteins; Coating compositions based on derivatives thereof
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)

## Abstract

This invention relates to a process for preparing multi-color dispersions and the multi-color dispersions made thereof.

## Claims

### Claim 1

A process for making a multi-color dispersion comprising:
i) contacting together
a first colorant,
a first aqueous dispersion of polymer particles comprising a polymerized product of at least one ethylenically unsaturated nonionic monomer comprising (meth)acrylic esters,
two or more of a first polysaccharide selected from the group consisting of guar, pectin, and carrageenan, and
two or more of a second polysaccharide selected from the group consisting of gelatin, methyl cellulose, and hydroxpropyl methyl cellulose to make a first colorant dispersion;
wherein the first colorant dispersion comprises from 0.1 wt. % to 5 wt. % of the first colorant, from 1 wt. % to 60 wt. % of the first aqueous dispersion of polymer particles, and from 0.1 wt. % to 10 wt. % each independently of the first and second polysaccharide;
ii) contacting the first colorant dispersion with a composition comprising
a) a second aqueous dispersion of polymer particles comprising a polymerized product of at least one ethylenically unsaturated nonionic monomer and
b) an ionic complexing agent to obtain a dispersion of protected first colorant particles;
wherein the composition comprises from 0.5 wt. % to 75 wt. % of the second aqueous dispersion of polymer particles, and from 0.1 wt. % to 5 wt. % of the ionic complexing agent, and wherein the ionic complexing agent comprises a phosphate, a hydrogen phosphate, a sulfate, borate, a citrate, or a chloride salt of Mg2+, Ca2+, Zn2+, or Ti4+, sodium borate, or boric acid;
iii) repeating steps i) and ii) with a second colorant that is different from the first colorant to obtain a dispersion of protected second colorant particles; and
iv) mixing the dispersions of protected first and second colorant particles to obtain a multi-color dispersion;
wherein the weight: weight ratio of the first polysaccharide to the second polysaccharide is from 1:3 to 3:1; and
wherein all weight percents are based on the total weight of the multi-color dispersion.

### Claim 2 (depends on 1)

The process for making the multi-color dispersion according to claim 1 wherein the first colorant dispersion further comprises from 0.1 wt. % to 1.6 wt. %, based on the total weight of the first colorant dispersion, an alginate, wherein the amount of the alginate is less than that of the second polysaccharide.

### Claim 3

A multi-color dispersion comprising a dispersion of protected first colorant particles and a dispersion of protected second colorant particles, wherein the multi-color dispersion comprises:
a) a first aqueous dispersion of polymer particles comprising from 1 wt. % to 60 wt. %, based on the total weight of the multi-color dispersion, of polymer particles comprising a polymerized product of at least one ethylenically unsaturated nonionic monomer comprising (meth)acrylic esters;
b) from 0.1 wt. % to 10 wt. %, based on the total weight of the multi-color dispersion, of two or more of a first polysaccharide selected from the group consisting of guar, pectin, and carrageenan;
c) from 0.1 wt. % to 10 wt. %, based on the total weight of the multi-color dispersion, of two or more of a second polysaccharide selected from the group consisting of gelatin, methyl cellulose, and hydroxpropyl methyl cellulose;
d) from 0.1 wt. % to 5 wt. %, based on the total weight of the multi-color dispersion, of an ionic complexing agent, wherein the ionic complexing agent comprises a phosphate, a hydrogen phosphate, a sulfate, borate, a citrate, or a chloride salt of Mg2+, Ca2+, Zn2+, or Ti4+, sodium borate, or boric acid;
e) from 0.1 wt. % to 5 wt. %, based on the total weight of the multi-color dispersion, of a first colorant; and
f) from 0.1 wt. % to 5 wt. %, based on the total weight of the multi-color dispersion, of a second colorant;
wherein the weight: weight ratio of the first polysaccharide to the second polysaccharide is from 1:3 to 3:1,
wherein cosolvents are absent from the multi-color dispersion, and
wherein the multi-color dispersion is prepared by:
(i) contacting together the first colorant, the first aqueous dispersion of polymer particles, the first polysaccharide, and the second polysaccharide to make a first colorant dispersion;
(ii) contacting the first colorant dispersion with a composition comprising
(a) a second aqueous dispersion of polymer particles comprising a polymerized product of at least one ethylenically unsaturated nonionic monomer comprising (meth)acrylic esters and
(b) the ionic complexing agent to obtain a dispersion of protected first colorant particles;
(iii) repeating steps (i) and (ii) with the second colorant to obtain a dispersion of protected second colorant particles; and
(iv) mixing the dispersions of protected first and second colorant particles to obtain a multi-color dispersion.

### Claim 4 (depends on 3)

The multi-color dispersion according to claim 3 wherein it further comprises from 0.1 wt. % to 1 wt. % based on the total weight of the multi-color dispersion, an alginate, and the amount of the alginate is less than that of the second polysaccharide.

### Claim 5 (depends on 3)

A coating composition comprising the multi-color dispersion according to claim 3.

### Claim 6 (depends on 3)

The multi-color dispersion according to claim 3, wherein the ionic complexing agent is a borate salt of Mg2+, Ca2+, Zn2+, or Ti4+, sodium borate, or boric acid.

### Claim 7

A multi-color dispersion comprising a dispersion of protected first colorant particles and a dispersion of protected second colorant particles, wherein the dispersion of protected first colorant particles comprises:
a first colorant dispersion comprising:
from 0.1 wt. % to 5 wt. % of a first colorant;
from 0.5 wt. % to 75 wt. % of first polymer particles;
from 0.1 wt. % to 10 wt. % of two or more of a first polysaccharide selected from the group consisting of guar, pectin, and carrageenan; and
from 0.1 wt. % to 10 wt. % of two or more of a second polysaccharide selected from the group consisting of gelatin, methyl cellulose, and hydroxpropyl methyl cellulose;
from 0.5 wt. % to 75 wt. % of a second aqueous dispersion of polymer particles; and
from 0.1 wt. % to 10 wt. % of an ionic complexing agent comprising a phosphate, a hydrogen phosphate, a sulfate, borate, a citrate, or a chloride salt of Mg2+, Ca2+, Zn2+, or Ti4+, sodium borate, or boric acid; and
the dispersion of protected second colorant particles comprises:
a second colorant dispersion comprising:
from 0.1 wt. % to 5 wt. % of a second colorant;
from 0.5 wt. % to 75 wt. % of first polymer particles;
from 0.1 wt. % to 10 wt. % of two or more of a first polysaccharide selected from the group consisting of guar, pectin, and carrageenan; and
from 0.1 wt. % to 10 wt. % of two or more of a second polysaccharide selected from the group consisting of gelatin, methyl cellulose, and hydroxpropyl methyl cellulose;
from 0.5 wt. % to 75 wt. % of a second aqueous dispersion of polymer particles; and
from 0.1 wt. % to 10 wt. % of an ionic complexing agent comprising a phosphate, a hydrogen phosphate, a sulfate, borate, a citrate, or a chloride salt of Mg2+, Ca2+, Zn2+, or Ti4+, sodium borate, or boric acid,
wherein the weight: weight ratio of the first polysaccharide to the second polysaccharide is from 1:3 to 3:1.

### Claim 8 (depends on 7)

The multi-color dispersion according to claim 7 wherein the multi-color dispersion further comprises from 0.1 wt. % to 1 wt. % based on the total weight of the multi-color dispersion, of an alginate, and the amount of the alginate is less than the amount of the second polysaccharide.

### Claim 9 (depends on 7)

A coating composition comprising the multi-color dispersion according to claim 7.