Process for preparing transparent/semi-transparent color dispersions and the color dispersions made thereof

Patent metadata

Field	Value
Publication number	US-10030162-B2
Application number	US-201414477298-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	Sep 4, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

This invention relates to a process for preparing color dispersions comprising a first step of contacting water, a first colorant, and a polysaccharide selected from methylcellulose, hydropropylmethylcellulose, hydroxyethylmethylcellulose, hydroxybutylmethylcellulose, hydroxyethylethylcellulose, and the mixture thereof, to form a first colorant dispersion; a second step of contacting the first colorant dispersion with a protective composition comprising an aqueous dispersion of polymer particles, clay, and a peptizing agent to form a dispersion of protected first colorant particles; an optional third step of repeating the first step and the second step with a second colorant that is different from the first colorant to form a dispersion of protected second colorant particles; and an optional fourth step of mixing the dispersions of protected first and second colorant particles to form a multi-color dispersion. This invention also relates to a color dispersion comprising the first colorant dispersion, and a color coating comprising the color dispersion.

First claim

What is claimed is:

1. A transparent/semi-transparent aqueous color dispersion comprising a first colorant dispersion and a protective composition,
wherein the first colorant dispersion comprises, based on total weight of the first colorant dispersion,
from 0.05 wt. % to 10 wt. % of a first colorant;
from 0.05 wt. % to 10 wt. % of a polysaccharide selected from methylcellulose, hydroxypropylmethylcellulose, and a mixture thereof; and
water,
wherein the first colorant dispersion is an aqueous solution; and
wherein the protective composition comprises, based on the total weight of the protective composition:
from 10 wt. % to 70 wt. % of polymer particles;
from 0.05 wt. % to 10 wt. % of a clay; and
from 0.05 wt. % to 2 wt. % of a peptizing agent;

wherein the weight to weight ratio of the first colorant dispersion to the protective composition is from 1:30 to 5:1,
wherein the protective composition comprises an aqueous dispersion of polymer particles, and wherein the transparent/semi-transparent aqueous color dispersion contains substantially no organic solvent.

2. The transparent/semi-transparent color dispersion according to claim 1 wherein the first colorant dispersion further comprises based on total weight of the first colorant dispersion, from 0.5 wt. % to 75 wt. % of polymer particles.

3. The transparent/semi-transparent color dispersion according to claim 1 wherein the first colorant dispersion further comprises a biocide and/or a thickener.

4. The transparent/semi-transparent aqueous color dispersion of claim 1 , wherein
the polymer particles comprise the polymerization product of at least one ethylenically unsaturated nonionic monomer;
the clay is a hydrous phyllosilicate clay;
and the peptizing agent is a sodium, lithium, or potassium pyrophosphate, carbonate, polyphosphate, metaphosphate, polyacrylate, or hydroxide peptizing agent, or a combination comprising at least one of the foregoing.

5. The transparent/semi-transparent aqueous color dispersion of claim 4 , wherein the ethylenically unsaturated nonionic monomer is a (meth)acrylic ester; a (meth)acrylonitrile; a (meth)acrylamide; an amino-functional monomer; a ureido-functional monomer; an acetoacetate-functional monomer; a styrene; a butadiene; an ethylene, propylene, or α-olefin; a vinyl ester; a vinyl monomer, or a combination comprising at least one of the foregoing.

6. An aqueous color coating comprising the transparent/semi-transparent aqueous color dispersion according to claim 1 , wherein the aqueous color coating contains substantially no organic solvent.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Yun Dong
• Wang Yujiang
• Liu Hui
• Wang Caifeng
• Jiang Siyuan

Classifications

• C09D5/29

  for multicolour effects · CPC title

• C09D5/02

  Emulsion paints {including aerosols} · CPC title

• C09B67/0033

  Blends of pigments; Mixtured crystals; Solid solutions · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C09B67/0085

  Non common dispersing agents · CPC title