Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-09-22
1977-12-06
Woodberry, Edward M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
536107, 536108, C08L 306
Patent
active
040616118
ABSTRACT:
This invention is directed to aqueous compositions and the process for preparing same and more specifically to aqueous coating compositions comprising polymeric resin binders and pigments dispersed in an aqueous system with starch ester dispersants. The dispersant consists of mixed esters of starch derived from (a) low molecular weight hydrolyzed starch having a plurality of anhydroglucose units or a derivative of said starch and (b) at least about 0.5 mole of acylating agent for each anhydroglucose unit of the hydrolyzed starch or its derivative. The acylating agent is a combination of anhydrides or acyl compounds consisting of (i) from about 0.1 to 2.9 moles of at least one anhydride of a polycarboxylic acid and (ii) from 0.1 to 2.9 moles of at least one compound selected from the class consisting of anhydrides of monocarboxylic acids and the acyl halides of monocarboxylic acids.
REFERENCES:
patent: 2891947 (1959-06-01), Paschall et al.
patent: 3557091 (1971-01-01), Martin et al.
patent: 3652542 (1972-03-01), Hjermstad et al.
patent: 4011392 (1977-03-01), Rudolph et al.
Bierwagen Gordon Paul
Glowaky Raymond Charles
Rudolph Stephen Edward
DuChez Neil A.
Smith Richard G.
The Sherwin-Williams Company
Tura James V.
Woodberry Edward M.
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