Liposomogenic UV absorber

Preferred liposomogenic UV Absorbers according to the invention which contain a triazine radical as the UV chromophore are those of the formula ##STR27## in which A1 is a radical of the formula ##STR28## or of the formula O--(CH2)ts --CH3 (17b)

and t3 and t4 independently of one another are a number from 5 to 13.

Further preferred liposomogenic UV absorbers according to the invention which contain a triazine radical as the UV chromophore are those of the formula ##STR29## in which R1 ' is hydrogen, hydroxyl, C1 -C15 alkyl or C1 -C15 alkoxy and

R12 ' is hydrogen or C1 -C15 alkoxy;

A1 ' and A2 ' independently of one another are C8 -C22 alkyl; and Hal is halogen.

Preferred liposomogenic UV absorbers according to the invention which contain a benzylidenecamphor as the UV chromophore are those of the formula ##STR30## or of the formula ##STR31## in which A1 and A2, W and Z, are as defined in formula (1).

The liposomogenic UV absorbers employed according to the invention are distinguished by the fact that they have

a high substantivity for human hair

and guarantee a high UV protection for hair.

The invention also relates to a hair cosmetics preparation comprising at least 0.25 to 5% by weight, based on the total weight of the composition, of a liposomogenic UV absorber of the formula (1) and at least one auxiliary which is tolerated by the skin and hair.

The hair cosmetics composition can be prepared by physical mixing of the liposomogenic UV absorber or absorbers with the auxiliary or auxiliaries by the usual methods, for example by simple stirring together of the individual components.

For use in hair cosmetics, the UV absorbers according to the invention usually have an average particle size in the range from 0.02 to 2, preferably 0.05 to 1.5, and especially from 0.1 to 1.0 μm, provided that they are not water-soluble. The insoluble UV absorbers according to the invention can be brought to the desired particle size by customary methods, for example grinding with, for example, a jet, ball, vibratory or hammer mill. Grinding is preferably carried out in the presence of 0.1 to 30, preferably 0.5 to 15% by weight, based on the UV absorber, of a grinding aid, for example an alkylated vinylpyrrolidone polymer, a vinylpyrrolidonelvinyl acetate copolymer, an acylglutamate or, in particular, a phospholipid.

Any emulsifier which can be employed conventionally can be used for the preparation of the hair cosmetics formulations according to the invention, for example one or more ethoxylated esters of naturally occurring derivatives, for example polyethoxylated esters of hydrogenated castor oil; or a silicone oil emulsifier, for example silicone polyol; a nonethoxylated or ethoxylated fatty acid soap; an ethoxylated fatty alcohol; a nonethoxylated or ethoxylated sorbitan ester; an ethoxylated fatty acid or an ethoxylated glyceride.