Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1997-06-16
1998-11-17
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8506, 8520, 86371, D06P 302
Patent
active
058370137
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improved process for preparing colored melamine-formaldehyde condensation products by mixing pigments or dyes into a reaction mixture comprising starting compounds for preparing the melamine-formaldehyde condensation products.
The present invention further relates to colored melamine-formaldehyde condensation products and to their use for producing colored articles, in particular fibers and webs.
EP-A 523485 describes melamine-formaldehyde condensation products produced with or without inclusion in the reaction mixture of additives such as pigments or dyes. The disadvantage of this unspecific procedure is that inhomogeneously colored condensation products are obtained for some applications, in particular in fiber and web manufacture. Furthermore, from experience to date, the spinning solutions frequently contain fisheyes which can cause blockage of the pipework and orifices.
It is an object of the present invention to provide an improved process for preparing colored melamine-formaldehyde condensation products that is free of the abovementioned disadvantages.
We have found that this object is achieved by a process for preparing colored melamine-formaldehyde condensation products by mixing pigments or dyes into a reaction mixture comprising starting compounds for preparing the melamine-formaldehyde condensation products, which comprises ##STR2## where X.sup.1, X.sup.2 and X.sup.3 are each selected from the group consisting of --NH.sub.2, --NHR.sup.1 and --NR.sup.1, R.sup.2, and X.sup.1, X.sup.2 and X.sup.3 are not all --NH.sub.2, and R.sup.1 and R.sup.2 are each selected from the group consisting of hydroxy-C.sub.2 -C.sub.10 -alkyl, hydroxy-C.sub.2 -C.sub.4 -alkyl-(oxa-C.sub.2 -C.sub.4 -alkyl ).sub.n, where n is from 1 to 5, and amino-C.sub.2 -C.sub.12 -alkyl, or mixtures of melamines I, and ratio of formaldehyde to melamines I within the range from 40:1 to 0, from the group consisting of C.sub.1 -C.sub.9 -alkyl and hydroxyl, C.sub.1 -C.sub.4 -alkanes substituted by 2 or 3 phenol groups, di(hydroxyphenyl) sulfones or mixtures thereof, 30% by weight, based on (a) and (b), and the phenol in an amount within the range from 0 to 5 mol %, based on (a) and (b), .gtoreq.1 .mu.m, further phenol, substituted melamine I and formaldehyde or formaldehyde-donating compounds, the amounts being chosen so that the molar ratio of melamines (melamine and (a)) to (b) is within the range from 1:1.15 to 1:4.5, the pigment or dye is present in an amount within the range from 0.01 to5% by weight, based on melamine and (a) and (b), and the phenol is present in an amount within the range from 0 to 5 mol %, based on melamine and (a) and (b), and then condensing in a conventional manner.
We have also found colored melamine-formaldehyde condensation products and their use for producing colored articles, in particular fibers and webs.
First step (A) of the process for the present invention comprises dispersing a mixture consisting essentially of ##STR3## where X.sup.1, X.sup.2 and X.sup.3 are each selected from the group consisting of --NH.sub.2, --NHR.sup.1 and --NR.sup.1 R.sup.2, and X.sup.1, X.sup.2 and X.sup.3 are not all --NH.sub.2, and R.sup.1 and R.sup.2 are each selected from the group consisting of hydroxy-C.sub.2 -C.sub.10 -alkyl, hydroxy-C.sub.2 -C.sub.4 -alkyl-(oxa-C.sub.2 -C.sub.4 -alkyl).sub.n, where n is from 1 to 5, and amino-C.sub.2 -C.sub.12 -alkyl, or mixtures of melamines I, and ratio of formaldehyde to melamines I within the range from 40:1 to 0, preferably from 25:1 to 0, from the group consisting of C.sub.l -C.sub.9 -alkyl and hydroxyl, C.sub.1 -C.sub.4 -alkanes substituted by 2 or 3 phenol groups, di(hydroxyphenyl) sulfones or mixtures thereof, the pigment or dye being added in an amount within the range from 0.01 to 30, preferably from 0.5 to 15,% by weight, based on (a) and (b), and the phenol in an amount within the range from 0 to 5, preferably from 0.2 to 2, mol %, based on (a) and (b), by intensive stirring until there are no longer any pigment agglomerates .gtoreq.1 .mu
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Guenther Erhard
Reuther Wolfgang
BASF - Aktiengesellschaft
Einsmann Margaret
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