Bisulfite terminated oligomers as dispersing agents
AssigneeUniroyal, Inc.
InventorsJohn T. O'Brien, Woodrow W. White
Life of this patent
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Abstract
This invention relates to the use of bisulfite-terminated oligomers as dispersants for solid particulate matter, i.e., low molecular weight bisulfate-terminated polymers containing carboxylate groups and either cyano or carbomethoxy moieties are improved dispersants for solid particulate matter like pigments such as titanium dioxide, clay, calcium carbonate, talc, and zinc oxide, as well as for organic pigments. Particularly, these dispersants have been found useful for stabilizing paper coating compositions.
Claims40
A method of dispersing insoluble solid particulate matter selected from the group consisting of inorganic pigments, extenders, and fillers in aqueous systems containing 25 to 85% by weight solid particulate matter comprising adding, in an amount effective to disperse the solid particulate matter, an oligomer having the formula:
- ##STR4## wherein M is a water soluble cation;
- X is selected from --CN and --COOCH.sub.3 ;
- M' is based on a cation selected from the group consisting of ammonia, an amine, and an alkali metal;
- a + b is from 4 to 250;
- and a/a + b is from 0.0 to 0.6.
A chemical composition comprising (a) 25 to 85% by weight insoluble solid particulate matter selected from the group consisting of inorganic pigments, extenders, and fillers, (b) water, and (c) an oligomeric dispersing agent having the formula:
- ##STR5## wherein M is a water soluble cation;
- X is selected from --CN and --COOCH.sub.3 ;
- M' is based on a cation selected from the group consisting of ammonia, an amine, and an alkali metal;
- a + b is from 4 to 250;
- and a/a + b is from about 0.0 to 0.6.
Dependencies are inferred from the claim text.