Patent ID: 8623792

Claim:
A treatment fluid comprising: an aqueous liquid and an associative polymer additive, wherein the associative polymer additive comprises a hydrophobic alkoxylated aminoplast polymer having at least one alkenyl unit as part of the hydrophobic modification; wherein the associative polymer additive increases the plastic viscosity (PV) of an aqueous liquid by more than at least 50% and wherein the associative polymer additive increases the yield point (YP) by no more than about 30% of the corresponding increase in the PV relative to an aqueous liquid without the associative polymer additive; wherein the associative polymer additive comprises hydrophobic segments and wherein the hydrophobic segments on the associative polymer additive comprise from 10% to 40% by weight of the total associative polymer; and, wherein the viscosity of the aqueous liquid comprising the associative polymer additive is capable of maintaining a viscosity of greater than about 20 cP for at least 20 minutes at temperatures higher than about 275° F.