Manufacture of high molecular weight poly (n-vinylamides)...

Details Manufacture of high molecular weight poly (n-vinylamides)... Manufacture of high molecular weight poly (n-vinylamides)...

C - Chemistry, Metallurgy

08

L

31/30, 400/9319

C08L 39/00 (2006.01) C08F 8/12 (2006.01) C08F 126/02 (2006.01)

Patent

CA 1321440

186-P-US03278 ABSTRACT The inverse emulsion polymerization of a monomer of the formula Image wherein R and R1 represent hydrogen or a C1-C4 alkyl group, using a surfactant system having a hydrophilic-lipophilic balance value from 4 to 9, an azo-type free radical initiator and certain hydrocarbon liquids to yield a water-in-oil emulsion of a homopolymer of at least 106 average molecular weight, the emulsion having a viscosity less than 10 cps, at 15% solids, 60 rpm Brookfield and 20°C. Also disclosed is the preparation of poly(vinylamines) of at least 106 average molecular weight by acid or base hydrolysis of the homopoly- mer emulsion. Also disclosed are drilling mud compositions, cements for drilling holes, completion fluids, acidized fracturing fluids. and wet-end paper additives containing the poly(vinylamines) and demonstrating superior properties.

547786

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