Surfactant stabilization of hygroscopic species
AssigneeEcolab USA Inc.
InventorsEmily Chen, Derrick Anderson, David Dotzauer, Erik C. Olson
Life of this patent
Estimating the term…
Abstract
Stable solid compositions employing a water conditioning agent, including hygroscopic species or non-hygroscopic species. In particular, solid compositions combining an ionic surfactant or an amphoteric surfactant with a water conditioning agent, preferably a polyacrylate water conditioning agent, are disclosed. The ionic surfactant or amphoteric surfactant beneficially stabilize the polymer and/or chelant water conditioning agent, preferably a polyacrylate water conditioning agent, to permit formulation into a solid composition and provide stability under harsh conditions, including humid environments. Applications of using the stable solid compositions are also disclosed.
Claims5
A method for stabilizing a water conditioning agent into a stable solid composition comprising:
- combining a water conditioning agent comprising from 22 wt-% to 26 wt-% of a chelant water conditioning agent comprising methylglycinediacetic acid (MGDA) and from 49 wt-% to 51 wt-% of a polycarboxylic acid polymer, copolymer and/or terpolymer (or salts thereof), and from 7.5 wt-% to 10 wt-% of a stabilizing surfactant comprising an amine oxide amphoteric surfactant to form a stable solid composition;
- wherein the stable solid composition is pressed, cast or extruded;
- wherein the stable solid composition does not comprise sodium carbonate;
- and
- maintaining the stable solid composition, wherein the stable solid composition has less than 5% change in thickness and diameter when heated to a temperature of 40° C. for two weeks with 65% humidity.
Dependencies are inferred from the claim text.