| abstract |
An elastic boundary fluid composition comprising water, at least one nonionic amphiphilic polymer and at least one surfactant, wherein the concentration of said polymer ranges from 0.5 to 5% by weight and the concentration of said surfactant ranges from 1 at 30% by weight (active base), based on the total weight of the composition, and wherein said amphiphilic polymer has a compound solubility parameter (δc) that ranges from above 19.3 MPa1 / 2 to 21.0 MPa1 / 2, where δ c is defined as follows: ** Formula ** where xi is the molar fraction of a polymerized monomer in the amphiphilic polymer backbone and δl is the homopolymer solubility parameter based on said monomer defined as: * * Formula ** where δD, δP and δH, respectively, are the Hansen dispersion variables, hydrogen binding and polar variables of the solubility parameter. |