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US 10,767,070 B2Granted
Process for preparing multi-color dispersions and multi-color dispersions made thereof
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsDong Yun, Yujiang Wang, Jian Sun, Peng Xu, Fei Guo
Life of this patent
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Abstract
This invention relates to a process for preparing multi-color dispersions and the multi-color dispersions made thereof.
Claims9
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.
14 more elements
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.
15 more elements
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.
19 more elements
Dependencies are inferred from the claim text.