Surfactant responsive micro-gels

摘要

A stable, aqueous composition containing a crosslinked, nonionic, amphiphilic polymer capable of forming a yield stress fluid in the presence of a surfactant is disclosed. The yield stress fluid is capable of suspending insoluble materials in the form of particulates and/or droplets requiring suspension or stabilization.

主权项

1. A yield stress fluid composition comprising water, at least one nonionic amphiphilic polymer and at least one surfactant wherein the concentration of said polymer ranges from 0.5to 5 wt. % and the concentration of said surfactant ranges from 1to 30 wt. % (active basis), based on the total weight of the composition, and wherein said amphiphilic polymer has a composite solubility parameter (δc) ranging from above about 19.3MPa1/2 to about 21.0 MPa1/2, wherein δc is defined as follows:
dc=Σxidi where xi , is the mole fraction of a monomer polymerized into the amphiphilic polymer backbone and δi is the solubility parameter of the homopolymer based on that monomer defined as:
di2 =dD2 +dP2 +dH2 where δD, δP, and δH, respectively, are the Hansen dispersion, polar and hydrogen bonding variables of the solubility parameter.