Substantive water-soluble bis-quaternary salts of cinnamidoalkylamines

Abstract

Substantive UV-absorbing water-soluble quaternary salts of cinnamidoalkylamine of formula I. Hair, skin and fabric care compositions containing the compounds of formula I. wherein R1 represents up to four substituents, same or different, selected from H, halo, -OH, -NH2, -NO2, -OCH3, -N(CH3)2, alkyl groups containing up to 6 carbon atoms, alkoxy groups containing up to 6 carbon atoms, alkylamino or N,N-dialkylamino groups containing up to 6 carbon atoms; R2 is selected from hydrogen, alkyl group containing up to 6 carbon atoms; R3 and R4 are independently selected from benzyl, alkyl group containing up to 6 carbon atoms; n is an integer from 1 to 6; m is an integer from 1 to 10; X- is a counter anion of quaternary centers selected from halides including chloride, bromide, iodide and methane sulphonate and its derivatives such as trifluoro methane sulphonate, benzene sulphonates including its p-bromo, nitro and methyl derivative.

Description

[0001] The invention relates to substantive water-soluble bis-quaternary salts of cinnamidoalkylamines. More particularly, the invention relates to novel, cationic, non-hydrolysable, non-irritating UV-absorbing bis-quaternary salts of cinnamidoalkylamines which are substantive to fabric, skin and hair. The invention also relates to a process of manufacture of the said compounds and further to their use in hair, skin and fabric care formulations.BACKGROUND AND PRIOR ART[0002] The harmful effects of solar UV-radiation on skin are well known. The UV-B (290-320 nm) portion of solar spectrum is largely responsible for erythema (sunburn) and cancer. [M. M. Rieger, Cosmet. Toiletries, 102 (3), 91, (1987); L. Taylor, Skin Cancer Foundation J., 4, (90) (1986)].[0003] Similarly, photodegradative effect of UV-radiation on human hair is well documented. Continuous exposure to sunrays makes human hair color and makes human hair rough, brittle and difficult to comb. UV rays are reported to damage...

AI Technical Summary

Problems solved by technology

The harmful effects of solar UV-radiation on skin are well known.

Continuous exposure to sunrays makes human hair color and makes human hair rough, brittle and difficult to comb.

UV rays are reported to damage the proteins of cuticles.

Prolonged irradiation results in diminished tensile strength due to breaking of disulphide bonds in keratin.

In addition, UV light is also known to fade garments.

However, all these molecules suffered from a major disadvantage of lack of substantivity.

However, they are slightly tacky, hygroscopic solids and difficult to handle and hence it is convenient to market or use these products as concentrated solutions.

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