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Use of a polyguanidine compound for treating or shaping the hair, especially for straightening or permanent-waving itRelated Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Live Hair Or Scalp Treating Compositions (nontherapeutic), Hair Coloring (nondyeing), MascaraUse of a polyguanidine compound for treating or shaping the hair, especially for straightening or permanent-waving it description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070071702, Use of a polyguanidine compound for treating or shaping the hair, especially for straightening or permanent-waving it. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a divisional of U.S. patent application Ser. No. 10/265,913, filed on Oct. 8, 2002, which claims priority to France Patent Application No. 0112973, filed on Oct. 9, 2001, each of which is hereby incorporated by reference in its entirety. [0002] The present invention relates to the use of polyguanidines or physiologically acceptable salts thereof for the protection of keratin fibres during permanent-shaping treatments or hair-straightening operations. [0003] The invention also relates to a cosmetic treatment process for permanently shaping or straightening keratin fibres, such that it consists in applying to the keratin fibres a composition containing a compound derived from polyguanidines. [0004] Polyalkylene guanidines are copolymers obtained by condensation of guanidine hydrochloride with an alkylenediamine. Such compounds and the preparations thereof from hexamethylenediamine have been known since 1975 by Zh. Prikl. Khim. (Leningrad) (1975), 48 (8), 1833-6, from Gembitskii, P. A. et al. [0005] Polyalkylene guanidines are known for their antibacterial activity, and this use is especially described in patents RU 2 143 905 and SU 1 687 261. More recently, the use of polyalkylene guanidines for skin care has been described. Thus, patents SU 1 803 099 and RU 2 106 859 describe the cicatrizing and emollient properties of these compounds. [0006] Patent application SU 857 257 describes the highly detergent properties of compositions based on polyhexamethylene guanidines. [0007] Various processes are known for synthesizing these polyalkylene guanidine derivatives. [0008] Patent applications EP 0 439 698, WO 99/54291 or RU 2 052 453 present alternatives to the processes for synthesizing polyalkylene guanidines described in the publication by Gembitskii et al. cited above. [0009] Advantageously and surprisingly, the inventors have discovered that compounds derived from poly-alkylene guanidines of formula (I) that will be defined below can be used in cosmetics to care for keratin fibres during permanent-shaping treatments. [0010] Preferably, the compound derived from polyguanidines will form part of the reducing composition used during the permanent-shaping operation. [0011] It is known that hair that is regularly subjected to permanent-waving operations loses its mechanical properties. This permanent-waved hair is more brittle and harder to shape, and furthermore it is difficult to obtain a uniform coloration on permanent-waved hair. [0012] It has also been noted that cosmetic treatments intended to straighten keratin materials, and in particular the hair, also have the consequence of adversely affecting the mechanical properties of the keratin materials. [0013] The inventors have thus shown that the use of compositions containing compounds derived from polyguanidines, during permanent-shaping or hair-straightening operations, makes it possible to limit or even nullify the degradative effects of permanent-waving operations. [0014] The compounds derived from polyguanidine that may be used in the context of the present invention correspond to formula (I) below: in which: [0015] X, R.sub.1, R.sub.2 and R.sub.3, independently of each other, are chosen from the group formed by a hydrogen atom, a hydroxyl radical and a linear or branched, saturated or unsaturated, optionally hydroxylated C.sub.1 to C.sub.16 and preferably C.sub.1 to C.sub.8 alkyl radical, [0016] Y denotes a radical NHR, in which R is chosen from the group formed by a hydrogen atom, a hydroxyl radical and a linear or branched, saturated or unsaturated, optionally hydroxylated C.sub.1 to C.sub.16 and preferably C.sub.1 to C.sub.8 alkyl radical, [0017] A denotes a linear or branched, saturated or unsaturated, C.sub.1 to C.sub.16 and preferably C.sub.1 to C.sub.12 alkylene radical optionally substituted with at least one radical chosen from a hydroxyl, carboxyl (--COOH) or carboxylate radical and a halogen, the said alkylene radical possibly containing at least one amine (--NH--), ether (--O--), thioether (--S--), ester (--(CO)O-- or --O(CO)--), amide (--CONR-- or --NRCO-- in which R is hydrogen or a C.sub.1 to C.sub.8 alkyl radical), carbamate (--NH(CO)O-- or --O(CO)NH--) or urea (--NH(CO)NH--) function, a C.sub.6 aryl or C.sub.3 to C.sub.8 cyclanyl ring optionally substituted with a C.sub.1-C.sub.8 alkyl, hydroxyl or halogen; or A denotes one or more C.sub.6 or C.sub.7 aryl or C.sub.5 to C.sub.7 cyclanyl rings optionally substituted with a C.sub.1-C.sub.8 alkyl, a hydroxyl group or a halogen or are unsubstituted; or A denotes a C.sub.10 to C.sub.14 polyaryl or C.sub.6 to C.sub.10 polycyclanyl chain, which may be interrupted with at least one C.sub.1 to C.sub.8 alkylene radical, an amine (--NH--), amide (--CONR-- or NRCO in which R is a C.sub.1 to C.sub.8 alkyl radical), ether (--O--), thioether (--S--), a hydrogen atom, carbamate (--NH(CO)O-- or --O(CO)NH--) or urea (--NH(CO)NH--) function; and [0018] n is an integer between 2 and 5 000 and preferably between 2 and 200, and the physiologically acceptable salts thereof. [0019] For the purposes of the present application, the term "carboxylate" means an addition salt of a carboxylic acid with a base chosen especially from sodium hydroxide, potassium hydroxide, aqueous ammonia, amines or alkanolamines or alternatively an ampholytic internal salt with a guanidinium group in the chain. [0020] For the purposes of the present application, the expression "C.sub.6 aryl ring" means a benzene nucleus, this nucleus possibly being substituted with one or two C.sub.1 or C.sub.8 alkyl radicals, OH or halogen. [0021] For the purposes of the present application, the expression "C.sub.10 to C.sub.14 polyaryl chain" means a chain containing 2 or 3 aromatic nuclei, each optionally being substituted with one or two C.sub.1 to C.sub.8 alkyl radicals, OH or halogen. [0022] Preferably, they will more particularly be derivatives of formula (I) defined above, in which A denotes a linear or branched, saturated or unsaturated C.sub.1 to C.sub.6 alkylene radical, optionally substituted with at least one radical chosen from hydroxyl, carboxyl and carboxylate radicals or halogens (fluorine, chlorine, bromine or iodine). [0023] As compounds derived from polyguanidines, either homopolymers or heteropolymers may be used. [0024] For the purposes of the present patent application, the term "homopolymer" means a polymer chain consisting of (--N(R.sub.1)--C(NR.sub.3)--N(R.sub.2)--A) units, in which R.sub.1, R.sub.2, R.sub.3 and A are always identical, and the term "heteropolymer" means a polymer for which at least one of the units R.sub.1, R.sub.2, R.sub.3 and A is different from the others. Continue reading about Use of a polyguanidine compound for treating or shaping the hair, especially for straightening or permanent-waving it... 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