| 摘要 |
The inverse emulsion polymerization of a monomer of the formula <CHEM> wherein R and R<1> 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 10<6> average molecular weight, the emulsion having a viscosity less than 10 cps, at 15% solids, 60 rpm Brookfield and 20 DEG C. Also disclosed is the preparation of poly(vinylamines) of at least 10<6> average molecular weight by acid or base hydrolysis of the homopolymer emulsion. Also disclosed are enhanced oil recovery compositions, 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. |
