Process for dispersing pigments with polyoxyalkylated ethers
AssigneePetrolite Corporation
InventorTimothy J. Baker
Life of this patent
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Abstract
A process of dispersing a pigment consists of agitating a pigment in water with a polyoxyalkylated ether dispersant. The polyoxyalkylated ether comprises Units of the formulae A and B wherein Unit A is an alkyl group of the formula: ##STR1## and; Unit B is an oxyalkylate of the formula: (OCH.sub.2 CHR.sub.2).sub.y OR.sub.3 (IB) wherein R and R.sub.1 individually represent hydrogen or a C.sub.1 -C.sub.10 alkyl group; R.sub.2 is --H or a C.sub.1 -C.sub.5 alkyl group; x represents a number from about 9 to about 75; R.sub.3 is --H or a C.sub.1 -C.sub.5 alkyl group; and y is between about 1 to about 475.
Claims29
A method of dispersing a pigment in an aqueous medium which comprises agitating an aqueous mixture of
- (a) water;
- (b) a polyoxyalkylated ether having the Units A and B
- wherein Unit A is an alkyl group of the formula:
- ##STR13## and R and R.sub.1 independently are hydrogen or a C.sub.1 -C.sub.10 alkyl group;
- and x represents a number of from about 9 to about 75;
- and
- Unit B is of the formula:
- (OCH.sub.2 CHR.sub.2).sub.y OR.sub.3
- wherein R.sub.2 is hydrogen or a C.sub.1 -C.sub.5 alkyl group;
- y is between from about I to about 475;
- R.sub.3 is hydrogen or a C.sub.1 -C.sub.5 alkyl group provided that when R.sub.3 is hydrogen, the weight ratio of B/A+B is between about 75 to about 95;
- and
- (c) grinding resin:
- and
- (d) a pigment
- until the pigment is uniformly distributed in the aqueous medium.
A method of dispersing a pigment in an aqueous medium which comprises agitating an aqueous mixture of
- (a) water;
- (b) a reaction product of (i) a solid polymer derived from a polyolefin and an ethylenically unsaturated carboxylic acid or ester or anhydride thereof and (ii) an alkyl end-capped polyalkylene glycol of the formula
- H(OCH.sub.2 CHR.sub.2).sub.y --O--R.sub.3
- wherein R.sub.2 is hydrogen or a C.sub.1 -C.sub.5 alkyl group, y is from about 8 to about 475 and R.sub.3 is a C.sub.1 -C.sub.5 alkyl group;
- and
- (c) grinding resin:
- and
- a pigment
- until the pigment is uniformly distributed in the aqueous medium.
A method of dispersing a pigment which comprises:
- (a) grinding a solid polyoxyalkylated ether having the Units A and B
- wherein Unit A is an alkyl group of the formula:
- ##STR17## and R and R.sub.1 individually are hydrogen or a C.sub.1 -C.sub.10 alkyl group;
- and x represents a number of from about 9 to about 75;
- and
- Unit B is of the formula:
- --(OCH.sub.2 CHR.sub.2).sub.y OR.sub.3--
- wherein R.sub.2 is hydrogen or a C.sub.1 -C.sub.10 alkyl group;
- y is between from about 1 to about 475;
- R.sub.3 is hydrogen or a C.sub.1 -C.sub.5 alkyl group provided that when R.sub.3 is hydrogen, the weight ratio of B/A+B is between about 75 to about 95;
- a grinding resin;
- and
- a solid pigment
- in an aqueous medium;
- and
- (b) agitating the aqueous medium until the pigment is uniformly distributed.
A method of dispersing a pigment in an aqueous medium which comprises:
- (a) preparing an aqueous dispersion of a polyoxyalkylated ether having the Units A and B
- wherein Unit A is an alkyl group of the formula:
- ##STR20## and R and R.sub.1 individually are hydrogen or a C.sub.1 -C.sub.10 alkyl group;
- and x represents a number of from about 9 to about 75;
- and
- Unit B is of the formula:
- (OCH.sub.2 CHR.sub.2).sub.y OR.sub.3
- wherein R.sub.2 is hydrogen or a C.sub.1 -C.sub.10 alkyl group;
- y is between from about 1 to about 475;
- R.sub.3 is hydrogen or a C.sub.1 -C.sub.5 alkyl group provided that when R.sub.3 is hydrogen, the weight ratio of B/A+B is between about 75 to about 95;
- and
- (b) combining the product of step (a) with either (i) a solid pigment and grinding resin or (ii) a pigment concentrate;
- and
- (c) dispersing the pigment in the resultant product of step (b) by agitation.
Dependencies are inferred from the claim text.