Patent ID: 8871692

Claim:
A method of performing an oil field application comprising using a water-soluble polymer in the oil field application, wherein the water-soluble polymer is anionic, is partially or totally neutralized with at least one organic counter-ion, is obtainable from a polymerization mixture containing at least one non-ionic monomer and at least one anionic monomer, wherein more than 1% of the anionic groups present in the polymer are neutralized with said organic counter-ions, wherein the organic counter-ion is added before or during the polymerization of the polymerization mixture, and wherein at least one organic counter-ion is selected from the group consisting of + NH 3 (CH 3 ), + NH 2 (CH 3 ) 2 , + NH(CH 3 ) 3 , + NH 3 (CH 2 CH 3 ), + NH 2 (CH 2 CH 3 ) 2 , + NH(CH 2 CH 3 ) 3 , + NH 3 (CH 2 CH 2 OH), + NH 2 (CH 2 CH 2 OH) 2 , + NH(CH 2 CH 2 OH) 3 , methylbis(polyoxyethylene (15)) octadecyl quaternary ammonium, cations derived from N,N-Diethanolamine, N,N,N-triethanolamine, N-ethanolamine, N,N-di-isopropylamine, N,N-diethylamine, N,N-dipropylamine, N,N-dimethylaminopropylamine (DMAPA), N-propylamine, N-isopropylamine, N-isobutylamine, N,N-di-isobutylamine, N,N-dibutylamine and N-butylamine.