Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-01-27
1996-03-12
Dodson, Shelley A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
424 47, 424 701, 424 7011, 424 7016, 528176, 528271, 528282, 528290, 528291, 528292, 528293, C08G 6312, A61K 706
Patent
active
054986907
DESCRIPTION:
BRIEF SUMMARY
RELATED APPLICATIONS
This application was filed as PCT International application Ser. No. PCT/EP 93/01887 on Jul. 17, 1993.
In cosmetics, hair treatment compositions which, for example, are in the form of styling lotion or hair spray, are used to hold, improve the structure of and style the hair. The hair treatment compositions predominantly consist of a solution of film-forming resins or synthetic polymers. Hitherto mainly the following film-formers have been used in hair treatment compositions: shellac, homopolymers and copolymers of N-vinylpyrrolidone and copolymers of vinyl ethers/maleic acid half-esters, of (meth)acrylic acid or the esters and amides thereof and crotonic acid with vinyl esters. The solvent used is in the main ethanol. The polymer solution is applied to the hair by spraying. After the solvent has dried, the hair is fixed in the desired style by the polymers. The polymers should on the one hand be sufficiently hydrophilic that they can easily be washed out of the hair and, on the other hand, they should be hydrophobic, so that the hair treated with polymers holds its style even when atmospheric humidity is high, and so that individual hairs do not stick together.
However, the polymer film-formers disclosed hitherto, such as polyvinylpyrrolidones, usually have the disadvantage that the absorption of water is too high in the case of increased atmospheric humidity. As already stated, this characteristic leads to undesired sticking together of the hairs and to a loss in strength and thus the collapse of the style. If, on the other hand, the resistance to high atmospheric humidity is improved, for example in the case of copolymers of N-vinylpyrrolidone and vinyl acetate, the elasticity of the film suffers and the brittleness of these films can even lead to unpleasant dusting and a flaky coating following hair treatment. In addition, the polymers become, in particular, very much more difficult to wash out. Moreover, because of their hydrolysis-resistant C--C chains, the polymers are not biodegradable.
Shellac, on the other hand, is biodegradable, but has many disadvantages. Thus its properties as a hair treatment composition are poorer than those of the homopolymers and copolymers of N-vinylpyrrolidone, in particular in respect to the tackiness, solubility in water and rigidity. Since shellac is a natural product, its properties are also subject to substantial fluctuations.
The patents U.S. Pat. No. 4,300,580, U.S. Pat. No. 3,734,874, DE 26 33 418 B2 and WO 89/07118 disclose NaSO.sub.3 -containing polyesters, the main chain of which has been synthesized by a condensation reaction and of which it is to be expected that they can be degraded to shorter segments by hydrolysis of the ester groups. A disadvantage of these NaSO.sub.3 -containing polyesters is, however, the poor ethanol compatibility, the result of which is that the polyesters can be used only in water or water/ethanol mixtures, which, of course, dry only poorly.
Water-soluble or water-dispersible polymers, for example polyesters, polyamides or polyurethanes, are becoming increasingly important because their product properties can easily be adjusted by means of suitable starting materials. It is known that maleic anhydride and trimellitic anhydride can be used to prepare water-soluble polyesters. The anhydride group provides carboxyl groups for the solubility in water. The solubility is achieved by neutralization with the aid of amines, metal hydroxides or metal carbonates. It is known from DE-A 26 37 167 and U.S. Pat. No. 3,523,998 that polycarboxylic acids and their anhydrides make a contribution similar to that of maleic anhydride and trimellitic anhydride toward rendering polyesters soluble in water. Water-soluble polymers of this type have not been disclosed hitherto for cosmetic purposes.
The present invention relates to the use of carboxyl-containing polycondensation products having glass transition temperatures T.sub.G .gtoreq.20.degree. C. obtained from anhydrides of tricarboxylic or tetracarboxylic acids and diols, diamine
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Kim Son N.
Sanner Axel
Sperling-Vietmeier Karin
BASF - Aktiengesellschaft
Dodson Shelley A.
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