Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Patent
1998-12-02
2000-11-07
Shah, Mukund J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
25230123, 252600, 427158, 544206, C07D25168, C09K 1106
Patent
active
06143888&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for inhibiting (quenching) the effect of anionic fluorescent whitening agents on substrates, especially on fibre materials, by treating the substrates with certain triazine-based ultra-violet absorption agents (UVAs), some of which are new compounds.
The fluorescent whitening effect exerted by fluorescent whitening agents on fibre materials treated with the said by fluorescent whitening agents, provides a valuable and aesthetically appealing whiteness improvement in the appearance of fibre materials so treated.
Particularly in the paper industry, however, there are situations in which the fluorescent whitening effect exerted by fluorescent whitening agents can lead to problems. For example, many paper-producing machines are required to produce, alternately, whitened and non-whitened paper. Problems arise when, after the machine has been used to produce whitened paper, it is subsequently-required for the production of non-whitened paper. In these circumstances, residual fluorescent whitening agent from the production of whitened paper remains on the machine parts and contaminates the paper obtained in the subsequent production of non-whitened paper.
It is possible, of course, to thoroughly clean the paper machine and its associated recycling systems whenever it has been used to produce whitened paper and is then immediately to be used to produce non-whitened paper. Such thorough ceaning is expensive, however, and impairs production capacity.
It has already been proposed, in DE-A-2 448 293, to apply a quencher compound to paper material which is not be whitened before or after sheet formation. Such quencher compounds have also been suggested for addition to whitened used paper from which non-whitened paper is to be produced.
The quencher compounds used in DE-A-2 448 293 are water-soluble acid addition salts or quaternary ammonium salts of compounds which contain a group of formula: ##STR1## in which the substituents on the phenyl nucleus are in m- or p-position to one another.
Most modern paper-making processes, however, are operated under neutral pH conditions and the compounds of DE-A-2 448 293 are unsatisfactory for such use since they only partly absorb on to the fibre under neutral application conditions. As a consequence, non-absorbed quencher compound is undesirably discharged into the waste water. Moreover, the compounds of DE-A-2 448 293 tend to flocculate, which is disadvantageous for use in the "wet-end" (paper formation) part of the paper-making process.
Surprisingly, it has now been found that triazine-based ultra-violet absorption agents (UVAs), when used as quenchers in paper-making processes, provide better absorption on to the fibre, lower waste water contamination and lower influence on dispersion stability (lower tendency to flocculate), relative to the compounds of DE-A-2 448 293.
Accordingly, the present invention provides a process for the inhibition (quenching) of the effect of an anionic fluorescent whitening agents on a substrate, comprising treating the substrate with a triazine UVA compound.
One preferred class of triazine UV absorbers is that having the formula: ##STR2## in which at least one of R.sub.1, R.sub.2 and R.sub.3 is a radical of formula: ##STR3## in which R.sub.4, R.sub.5 and R.sub.6, independently, are hydrogen; C.sub.1 -C.sub.12 alkoxy; hydroxy; --O--CH.sub.2 --CO--NH--CH.sub.2 0H; SO.sub.3 M in which M is hydrogen, sodium, potassium, ammonium, mono-, di-, tri- or tetra-C.sub.1 -C.sub.4 alkylammonium, mono-, di- or tri-C.sub.1 -C.sub.4 hydroxyalkylammonium or ammonium that is di- or tri-substituted by a mixture of C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.4 hydroxyalkyl groups; or ##STR4## in which n is an integer from 2 to 6 and is preferably 2 or 3;
Y.sub.1 and Y.sub.2, independently, are C.sub.1 -C.sub.4 alkyl optionally substituted by halogen, cyano, hydroxy or C.sub.1 -C.sub.4 alkoxy or Y.sub.1 and Y.sub.2, together with the nitrogen atom to which they are each attached, form a 5-7 membered heterocyclic ring, preferably
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Hochberg Robert
Metzger Georges
Reinehr Dieter
Rohringer Peter
Balasubramanian Venkataraman
Ciba Specialty Chemicals Corporation
Mansfield Kevin T.
Shah Mukund J.
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