| Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof -> Monitor Keywords |
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Tenside composition containing gemini tensides and co-amphiphiles and production and use thereofRelated Patent Categories: Colloid Systems And Wetting Agents; Subcombinations Thereof; Processes Of, Continuous Liquid Or Supercritical Phase: Colloid Systems; Compositions An Agent For Making Or Stabilizing Colloid Systems; Processes Of Making Or Stabilizing Colloid Systems; Processes Of Preparing The Compositions (e.g., Micelle; Thickening Agent; Protective Colloid Agent; Composition Containing An Emulsifying Agent With No Dispersant Disclosed; Organic Liquid Emulsified In Anhydrous Hf), Primarily Organic Continuous Liquid Phase (e.g., Organic Liquid Emulsified In An Organic Liquid), Discontinuous Phase Primarily Inorganic Liquid (e.g., Water-in-oil Emulsion, W/o), The Agent Contains Organic Compound Containing Nitrogen, Except If Present Solely As Nh4+Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080051472, Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a surfactant composition of gemini surfactants and one or more co-amphiphile(s), to a process for preparing such composition, and to its uses, especially as emulsifiers and dispersants. [0003] 2. Description of the Prior Art [0004] Mixtures of surfactants and co-amphiphiles and their use in emulsions or dispersions are well known. These mixtures have been designed for optimising the surfactant molecules pattern at the phase boundaries. When making emulsions, it is often intended to form liquid-crystalline, lamellar phases, which can be utilised to stabilise the emulsion. [0005] Proportionate mixtures of special surfactants and co-amphiphiles are employed according to their applications. For those applications which require a high electrolyte content in aqueous solutions or emulsions/dispersions, ionic surfactants have up to now been considered to be largely unsuitable. In order to improve the selection of appropriate surfactants, efforts have been made to quantify or classify their polarities, thus enabling a more reliable assessment of the properties and application patterns. The HLB concept and its variations is mentioned here as an example of a simple approach. [0006] Gemini surfactants, both as nonionic and cationic variants, have been known for more than twenty years, but it was not earlier than in the '90s that they stirred up a deeper interest. For a survey of the state of the art, see R. Zana, "Dimeric (Gemini) Surfactants" in Novel Surfactants Preparation, Applications and Biodegradability, C. Holmberg (ed.), Marcel Dekker (1998), p. 241. [0007] Most of the recent publications deal with ionic gemini surfactants because these materials significantly enhance the interfacial activity, for instance expressed in terms of the critical micelle formation constant or the reduction in surface tension of water, in comparison with conventional surfactants. [0008] At first gemini surfactants were mainly recommended for use in detergents and cleaning products. [0009] JP-A 08/268,865 also describes the use of gemini surfactants in cosmetic preparations. In the formulations disclosed therein conventional anionic surfactants have been exchanged for anionic gemini surfactants, which are considerably less irritant to the skin, without laborious modification of the formulations. [0010] EP-A-0 697 244 discloses amphoteric gemini surfactants, which can also be mixed with other anionic, nonionic, cationic, or amphoteric surfactants. Said surfactants are reported to be useful in detergents. The gemini surfactants (gemini amides) described in WO 95/19953 can be employed among others as components in customary cleaning preparations. In WO 95/19955 gemini polyethers have been disclosed as another class of gemini surfactants, which are useful for the same application mentioned hereinbefore. Mixtures of alkoxylated bisalkylphenol gemini surfactants and other surfactants are known from WO 97/23449. [0011] In JP-A 11/60430 and JP-A 11/60437 the use of anionic gemini surfactants in cosmetics has been described. Reportedly, these surfactants can also be combined with other surfactants. [0012] However, in contrast to what might be expected due to the substantial improvement in interfacial activity, no significant increase in efficiency or distinct improvement of application characteristics has been brought about by gemini surfactants as direct substitutes for conventional surfactants. The meagre advantage of such surfactant substitution cannot justify the effort of incorporating an additional building element in the basic structure. SUMMARY OF THE INVENTION [0013] It is an object of the present invention to provide a composition containing gemini surfactants and auxiliaries (hereinafter termed "surfactant composition"), which will allow to utilise the known benefits of gemini surfactants in special uses in the broadest possible spectrum of applications, thus opening up a commercially interesting larger field. [0014] According to the present invention, the problem has been solved by providing surfactant compositions of at least one gemini surfactant and at least one co-amphiphile having an HLB value of less than 6, said surfactant composition containing from 1 to 70 wt % of gemini surfactant and from 99 to 30 wt % of coamphiphile, referring to the total quantity of gemini surfactant and co-amphiphile. The preferred embodiments of the invention are set out in the subordinate claims. DESCRIPTION OF THE PREFERRED EMBODIMENT [0015] It has been found that the surfactant compositions of the invention containing gemini surfactants and co-amphiphiles not only optimise specific application characteristics, but also present considerable multifunctionality and greater efficiency, when compared to mixtures of conventional (non-gemini) surfactants and co-amphiphiles. [0016] Multifunctionality is expressed for example by the surprising fact that it is possible to disperse a hydrophilic or hydrophobic pigment both in an oil phase and in a water phase (emulsifying and dispersing effect), when using the very same mixture of gemini surfactant and co-surfactant. With several of the surfactant compositions of the invention the degree of multifunctionality is even so high that one and the same surfactant composition is both an excellent emulsifier and dispersant without the need to adjust the respective emulsifier/dispersant system to the particular application. With respect to its emulsifying effect, the surfactant composition of the invention may be termed a gel network emulsifier. [0017] The oil-in-water (O/W) emulsions prepared with the aid of the surfactant compositions of the invention are characterised by a substantially smaller oil drop size, when applying the "phase transfer temperature" method during production. [0018] The surfactant compositions of the invention impart to the emulsions or dispersions prepared therefrom a degree of electrolyte stability which up to now has been unknown even with nonionic systems. In comparison with known complex emulsifiers, an electrolyte quantity which is greater by the factor 5 to 10 and which results in the breakdown of conventional emulsions will not produce this effect if the emulsions contain the components of the invention. The emulsions or dispersions prepared from the surfactant compositions of the invention remain stable at pH values within a range from 3 to 12. [0019] Furthermore, the surfactant compositions of the invention have film-forming properties, which are particularly favourable regarding the large variety of applications, for example skin creams, UV protectants, or hair care products. [0020] In addition to their technical functionality, the products are exceptionally mild. For example, by addition of the surfactant compositions of the invention to alkylether sulfates, alkylbenzene sulfonates, and other anionic surfactants the irritation potential of these substances can be distinctly reduced. The surfactant compositions are also distinguished by their high affinity for various types of interfaces. Besides the technical advantages gained when formulating different products, also application benefits have been found, such as improved combability of wet/dry hair, antistatic features, and silky touch of the skin. [0021] This surprising multifunctionality or universal applicability has up to now been unknown both in individual surfactants and combinations of conventional surfactants and co-surfactants. It is now possible to distinctly simplify formulations, shorten formulation development work, and improve logistics. Furthermore, the application formulations thus made are much more efficient. Continue reading about Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof... Full patent description for Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Tenside composition containing gemini tensides and co-amphiphiles and production and use thereof patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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