Bisulfite terminated oligomers as dispersing agents

Details Bisulfite terminated oligomers as dispersing agents Bisulfite terminated oligomers as dispersing agents

B - Operations, Transporting

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B01F 3/00 (2006.01) B01F 17/00 (2006.01) D21H 19/38 (2006.01) D21H 19/40 (2006.01) D21H 19/46 (2006.01) D21H 19/58 (2006.01)

Patent

CA 1056689

ABSTRACT OF THE DISCLOSURE This invention relates to the use of bisulfite- terminated oligomers as dispersants for solid particulate matter, i.e., low molecular weight bisulfite-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, talk, and zinc oxide, as well as for organic pigments. Particularly, these dispersants have been found useful for stabilizing paper coating compositions. Oligomers represented by the following formula have been found useful: Image wherein M is an alkali metal or ammonium cation; X is selected form -CN and -COOCH3; M1 is a cation based. on ammonia, an amine, or alkali metal; a+b is form 4 to 250 and a/a+b is from about 0 to not greater than 0.6.

214915

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