Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Carbohydrate doai
Patent
1991-06-07
1993-01-05
Brown, Johnnie R.
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Carbohydrate doai
514 23, 514970, 514975, 536114, 536123, 424 70, 106208, 8908, A61K 31715, A61K 3170, C08B 3700
Patent
active
051770660
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to stabilization of a composition containing an anionic surfactant. More particularly, the invention relates to a process for stabilizing a composition containing an anionic surfactant by use of a cationized xanthan gum, a stabilizer containing a cationized xanthan gum as a component for the anionic surfactant-containing composition, and a stabilized anionic surfactant-containing composition containing a cationized xanthan gum.
2. Background Art
Anionic surfactants have been used in various industrial fields for various purposes, for example, as assistants for washing, penetration and dyeing in textile industry, as dispersants for dyestuffs, pigments and inks in colorant industry, as a base of dispersants and spreaders for water-dispersible powders and flowable preparations in agricultural chemical industry, as consolidation inhibitors in fertilizer industry, as water-reducing agents and superplasticizers in building and civil engineering industry, as dispersants for paper processing in paper and pulp industry, as emulsifiers for emulsion polymerization in rubber and plastic industry, and as raw materials for hair care cosmetics and foaming agents for dentifrices in pharmaceutical and cosmetic industry. For the purpose of increasing viscosity or stabilizing suspension of compositions containing anionic surfactants, colloidal silica, bentonite and the like have hitherto been used, but no sufficient effect is obtained.
Xanthan gum is an anionic high molecular polysaccharide that pure cultured microorganism Xanthomonas Campestris accumulates extracellularly in fermentation step. The constituent monosaccharides thereof are glucose, mannose and glucuronic acid present in a glucose:mannose:glucuronic acid ratio of 2:2:1. Since xanthan gum shows a very pseudo-plasticity and a high viscosity and has a thickening property, a high suspension stabilizing property and special rheological properties, it has been used in various fields.
However, xanthan gum does not show its original viscosity in the presence of an anionic surfactant, and particularly, in a composition containing not less than 15% by weight of an anionic surfactant the xanthan gum is salted out or is insoluble, and it is present in the form of xanthan gum particles in the system. Since xanthan gum cannot exhibit the thickening or suspension-stabilizing characteristics for compositions containing anionic surfactants, it has not been able to be used as a stabilizer for the compositions.
Also, various modified xanthan gums are known. A cationized xanthan gum is disclosed in U.S. Pat. No. 3,244,695, Japanese Patent Publication Kokoku No. 47-2846 and Japanese Patent Publication Kokai No. 62-243601. In these publications, it is disclosed that cationized xanthan gum has a suspending property, a coagulating property and a resistance to decomposition by bacteria, but in general it shows behaviors similar to xanthan gum. Consequently, cationized xanthan gum has not been used for the purpose of thickening or suspension-stabilization of compositions containing anionic surfactants.
DISCLOSURE OF THE INVENTION
The present inventors have found that despite no difference from xanthan gum in properties such as viscosity, cationized xanthan gum unexpectedly exhibits excellent effects when used as a thickening agent or suspension-stabilizing agent for compositions containing anionic surfactants to which xanthan gum has not been able to be applied. Thus, they have accomplished the present invention.
The present invention provides a process for stabilizing a composition containing an anionic surfactant which comprises incorporating a cationized xanthan gum in the composition containing an anionic surfactant.
In accordance with another aspect of the present invention, there is provided a stabilizer suitable for use in a composition containing an anionic surfactant, which contains a cationized xanthan gum as a component.
In accordance with still another aspect of the present invention, there is provided a stabil
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Aoki Seiji
Ogawa Masazo
Shimohiro Yoshiyuki
Brown Johnnie R.
Dainippon Pharmaceutical Co., Ltd.
White Everett
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