Browse Prior Art Database

Method of colouring porous material

IP.com Disclosure Number: IPCOM000033397D
Publication Date: 2004-Dec-09
Document File: 134 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

Process of colouring porous material, which comprises a) applying to the material being coloured at least one capped diazonium compound,and b) then causing the capped diazonium compound present on the material to react with the hair. In addition, novel dyeing compounds and compositions thereof are claimed.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 1% of the total text.

HP/5-22888

Method of colouring porous material

The present invention relates to a method of colouring porous material, for example metal, wood or keratin-containing fibres, especially human hair, using capped diazonium compounds.

For colouring hair oxidation dyes are used in most cases; however, they too are not capable of satisfying all requirements. The fastness to washing properties are often inadequate and, in addition, the colouring conditions required often cause a greater or lesser amount of damage to the hair. There has therefore been a need for a colouring method which does not have the mentioned disadvantages or which has them to an insignificant degree.

The present invention relates to a process of colouring porous material, which comprises

a) applying to the material being coloured at least one capped diazonium compound,

and

b) then causing the capped diazonium compound present on the material to react with the hair.

The colorations obtained are distinguished by outstanding fastness to washing properties, and there is virtually no damage to the hair. Moreover, there is no staining of the scalp, because the dye components do not penetrate into the skin and non-fixed dye can be washed off readily.

Suitable capped diazonium compounds include, for example, compounds of formula (1), (2), (3), (4) or (5)

                             (1)

                                                        

                 (2)

                  (3)

                                                                                  (4)       

                                  (5)

wherein

Q is a radical of an organic compound, preferably an unsubstituted or substituted non-ionic, cationic, amphoteric, zwitterionic or anionic radical of an organic compound,

R is the radical of an unsubstituted or substituted, water-soluble aliphatic or aromatic amine, and

T is an unsubstituted or substituted, aliphatic or aromatic residue,

wherein at least one of the groups must contain a radical imparting water solubility.

Suitable radicals R imparting water solubility include, for example, SO3H, COOH, OH, a quaternised ammonium radical of formula

wherein R1, R2 and R3 are each independently of the others unsubstituted or substituted alkyl, and An is an anion;

or

a quaternised nitrogen radical, which is part of a cationic heterocycle.

According to the invention, alkyl groups R, R1, R2, R3 and R4 are to be understood as being generally open-chain or branched alkyl radicals, for example methyl, ethyl, n- or iso-propyl and n-, sec- or tert-butyl.

Such alkyl radicals may be mono- or poly-substituted, for example by hydroxy, carboxy, halogen, cyano or by C1-C4alkoxy.

Preferably, the alkyl groups are unsubstituted and each has from 1 to 4, especia...