Phosphate ester pigment dispersant
First Claim
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1. An aqueous pigment dispersion comprising a pigment and a dispersing agent having the formula:
- ##STR9## wherein;
R and R'"'"' are the same or different, linear or branched alkyl groups of 2 to 12 carbon atoms;
k and l are the same or different integers having a value of 1 or 2;
x and y are the same or different integers having values of greater than 1 but less than 13; and
,M is a cation.
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Abstract
An aqueous pigment dispersion containing as the dispersing agent a phosphate ester salt having the general formula: ##STR1## wherein: R and R'"'"' are the same or different linear or branched alkyl groups of 2 to 12 carbon atoms;
k and l are the same or different integers having a value of 1 or 2;
x and y are the same or different integers having values of greater than 1 but less than 13; and,
M is a cation selected from the group consisting of potassium, sodium and ammonium. The dispersing agent is especially useful to disperse azo type pigments. The resulting pigment dispersion exhibits improved stability.
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15 Claims
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1. An aqueous pigment dispersion comprising a pigment and a dispersing agent having the formula:
- ##STR9## wherein;
R and R'"'"' are the same or different, linear or branched alkyl groups of 2 to 12 carbon atoms;k and l are the same or different integers having a value of 1 or 2; x and y are the same or different integers having values of greater than 1 but less than 13; and
,M is a cation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- ##STR9## wherein;
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15. A method of preparing an aqueous pigment dispersion, comprising stirring a mixture of pigment, water and a dispersing agent having the formula:
- ##STR10## wherein;
R and R'"'"' are the same or different, linear or branched alkyl groups of 2 to 12 carbon atoms;k and l are the same or different integers having a value of 1 or 2; x and y are the same or different integers having values of greater than 1 but less than 13; and
,M is a cation.
- ##STR10## wherein;
Specification