Polyamino amides for protecting hair against atmospheric attack, and in particular against light, and process for protecting hair employing such polyaminoamides

Claim 1

A process for protecting hair keratin against light comprising applying to hair an effective quantity to protect said hair keratin against light of a cosmetic composition containing, in a cosmetically acceptable medium, at least one polyaminoamide selected from the group consisting of (I) a polyaminoamide (A) prepared by polycondensation of an acidic compound selected from the group consisting of (a) an organic dicarboxylic acid, (b) a double bonded aliphatic mono- or dicarboxylic acid, (c) an ester of the acid defined in (a) and (b), and (d) a mixture of the compounds defined in (a), (b) and (c), with a polyamine chosen from a mono- or bis-secondary bis-primary polyalkylenepolyamine, it being possible for 0 to 40 mol % of said polyalkylene polyamine being replaceable by a bis-primary amine or by a bis-secondary amine and it further being possible for 0 to 20 mol % of said polyalkylene polyamine being replaceable by hexamethylenediamine; (II) said polyaminoamide (A) of (I) crosslinked with a crosslinking agent selected from the group consisting of an epihalohydrin, a diepoxide, a dianhydride, an unsaturated anhydride and a bis-unsaturated derivative, said crosslinking agent being employed in an amount of 0.025 to 0.35 mole of crosslinking agent per secondary amine group of said polyaminoamide (A); (III) said crosslinked polyaminoamide (A) of (II) alkylated with an epoxide or an unsaturated derivative; (IV) a water-soluble crosslinked polyaminoamide obtained by crosslinking said polyaminoamide (A) defined in I above, with a crosslinking agent selected from the group consisting of: (1) a simple difunctional compound selected from the group consisting of (a) bishalohydrin, (b) a bisazetidinium, (c) a bishaloacyldiamine and (d) an alkyl bishalide; (2) an oligomer obtained by reaction of a compound (a) selected from the group consisting of (i) a bishalohydrin, (ii) a bisazetidinium, (iii) a bishaloacyldiamine, (iv) an alkyl bishalide, (v) an epihalohydrin, (vi) a diepoxide and (vii) a bis-unsaturated derivative with a compound (b) which is a difunctional compound reactive towards said compound (a); (3) the quaternization product of a compound selected from the group consisting of said compound (1) and said oligomer (2) and containing one or more tertiary amine groups capable of being completely or partially alkylated with an alkylating agent (c) selected from the group consisting of methyl or ethyl chloride, bromide, iodide, sulphate, mesylate and tosylate, benzyl chloride or bromide, ethylene oxide, propylene oxide and glycidol; the crosslinking being carried out by means of 0.025 and 0.35 mole of crosslinking agent per amine group of said polyaminoamide; (V) a water-soluble polyaminoamide derivative resulting from the condensation of a polyalkylene polyamine containing two primary amino groups, at least one secondary amino group and alkylene groups containing 2 to 4 carbon atoms with a dicarboxylic acid having the formula: HOOC--C.sub.m H.sub.2m --COOH in which m denotes an integer from 4 to 8, or with a functional derivative of said dicarboxylic acid, in a molar ratio of 0.8:1 to 1.2:1, followed by an alkylation in aqueous solution with a difunctional agent having the formula ##STR3## in which x denotes an integer from 0 to 7, Z denotes one of ##STR4## R 1 and R 2 each denote a lower alkyl group or a lower hydroxyalkyl group containing 1 to 4 carbon atoms, Y denotes an alkylene radical containing from 2 to 6 carbon atoms, a 2-hydroxy-1,3-propylene radical or one of --CH.sub.2 --CH.sub.2 --NH--CO--NH--CH.sub.2 --CH.sub.2 --and --CH.sub.2 --Ch.sub.2 --CH.sub.2 --NH--CO--NH--CH.sub.2 --CH.sub.2 --CH.sub.2 --, Q.sup.⊖ denotes halogen, sulphate or methosulphate, the quantity of said difunctional alkylating agent being chosen so that the alkylation product remains in solution; and (VI) a water-soluble polymer obtained by reaction of a polyalkylenepolyamine containing two primary amine groups and at least one secondary amine group with a dicarboxylic acid selected from diglycolic acid and a saturated aliphatic dicarboxylic acid containing 3 to 8 carbon atoms; the molar ratio of said polyalkylenepolyamine to said dicarboxylic acid being between 0.8:1 and 1.4:1; the resultant polyamide being reacted with epichlorohydrin in a molar ratio of epichlorohydrin to the secondary amine group of the said polyamide of between 0.5:1 and 1.8:1.