Rhone-poulenc Specialites Chimiques

Rhone-poulenc Industries

Chloe Chimie

Michel Peignier

Claude Renault

Marie-Madeleine Besnard

Pierre Gagne

Dominique Lespinasse

Michel Garcia

Jean-Bernard Chaux

Alain Senechal

Suspensions of solid particulates in aqueous media, useful, e.g., as thickeners in a wide variety of foodstuff and industrial applications, are sedimentations stabilized by incorporating therein a stabilizing amount of xanthan/carob gum, optionally starch admixture.

Stable suspensions of solid particulates in aqueous media

Stable oil-in-water emulsions are prepared containing a relatively high concentration of from 8 to 60% by weight of a heteropolysaccharide bipolymer, e.g., xanthan gum preferably, the emulsions contain greater than 15 up to 60% biopolymer, 40 to 99 parts of an aqueous phase containing 10 to 60% by weight biopolymer and 40% to 90% by weight water, 1 to 60 parts oil and 1 to 40% with respect to the aqueous phase and oil of a surface active agent. The emulsions are prepared by combining powdered biopolymer with water, oil and surfactant or by concentrating an oil-in-water emulsion containing the biopolymer such as by ultrafiltration. A fermentation wort containing the biopolymer may be used in preparing the emulsion.

Oil-in-water emulsions containing heteropolysaccharide biopolymers

Storage-stable, pumpable, concentrated polymer suspensions, well adapted for use as thickening and flocculating agents, are comprised of (i) a water-soluble polymer, (ii) at least one water-soluble surfactant, and (iii) water, the amount of water being less than about 30% by weight of the total weight thereof.

Storage-stable, pumpable concentrated suspensions of water-soluble

Process for preventing soil redeposition onto textile articles made of natural, synthetic or artificial fibers or a blend thereof, during dry cleaning operations using stabilized perchloroethylene. It is characterized in that a sufficient amount of at least one C.sub.4 to C.sub.6 alcohol, chosen from amongst those having a boiling point of between 95.degree. and 140.degree. C. and those forming, with the perchloroethylene, an azeotrope having a boiling point of between 80.degree. and 130.degree. C., is incorporated into this perchloroethylene.

Process for preventing the redeposition of soil during dry cleaning, and

Process for anti-redeposition of staining substances on textiles of natural, synthetic or artificial fibers or mixtures thereof in the course of operations of dry cleaning or de-oiling by means of suitably stabilized perchloroethylene in which a sufficient amount of an additive represented by at least one monoketone compound having a boiling point below or equal to 160.degree. C. and, preferably lower than 140.degree. C., is added as an anti-redeposition additive.

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Versailles, France

Michel Peignier