Bleaching and dyeing; fluid treatment and chemical modification – Color protecting process for dyed product
Patent
1997-08-11
1999-08-17
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Color protecting process for dyed product
8490, 8543, 8549, 8918, 8566, 8587, 8602, D06P 0366
Patent
active
059387939
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for increasing the sun protection factor of cellulosic fibre materials, which comprises treating the cellulosic fibre materials with reactive dyes in the presence of at least one reactive UV absorber.
The skin-damaging effect of UV radiation is known. Protection from strong sunlight is usually sought by applying a sun cream, a composition that contains a UV absorber, directly to the skin. In particularly sunny regions, for example in Australia or America, however, the rate of skin damage due to UV radiation is lately increasing dramatically. Accordingly, more attention is paid in these countries to protecting the skin from solar irradiation.
It has therefore been proposed that the skin should be protected not just directly, but also to reduce the UV transmissibility of the clothing and also of other sun protection articles fabricated from cellulosic fibre materials, such as awnings or parasols. Most cellulosic fibre materials, whether dyed or undyed, are at least partially transparent to UV radiation, so that the mere wearing of clothing does not offer adequate protection to the skin from damage due to UV radiation. A remedy is possible here by incorporating UV absorbers into the fibre material.
However, hitherto the results achieved in respect of the protection from UV radiation in the area of cellulosic fibre materials, in particular textile materials, have not been satisfactory and there therefore continues to be a need for improving the sun protection factor of these materials.
It has now been found, surprisingly, that even better sun protection can be achieved if cellulosic fibre materials are treated with a combination of reactive dyes with reactive UV absorbers.
The present invention accordingly provides a process for increasing the sun protection factor of cellulosic fibre materials, which comprises treating the cellulosic fibre materials with at least one reactive dye and at least one reactive UV absorber.
In the process of the present invention, the amounts in which the reactive dyes are used in the dyebaths may vary with the desired depth of shade; in general, advantageous amounts range from 0.001 to 10% by weight, in particular from 0.001 to 5% by weight, based on the weight of the fibre material.
The amounts of reactive UV absorber used in the process of the present invention can vary between 0.001 and 5% by weight, based on the weight of the fibre material.
In a preferred embodiment of the process of the present invention, the amount of reactive UV absorber used depends on the total amount of dye used. For instance, the amount of reactive UV absorber used is from 0.5 to 5% by weight, in particular from 0.5 to 1% by weight, based on the weight of the fibre material, in the case of pale shades, from 0.05 to 0.5% by weight in the case of medium shades and from 0.001 to 0.05% by weight in the case of deep shades. Pale shades are to be understood as meaning those where the amount of dye used is from 0.001 to 0.2% by weight, based on the weight of the fibre material. Medium shades are those where the amount of dye used is from 0.2 to 2.0% by weight and deep shades are those where the amount of dye used is from 2.0 to 10% by weight, in particular from 2.0 to 5% by weight.
In a particularly preferred embodiment of the process of the present invention, the amount of reactive dye used is from 0.2 to 2% by weight, based on the weight of the fibre material, and the amount of reactive UV absorber used is from 0.05 to 0.5% by weight, based on the weight of the fibre material.
In a very particularly preferred embodiment of the process of the present invention, the amount of reactive dye used is from 0.001 to 0.2% by weight, based on the weight of the fibre material, and the amount of reactive UV absorber used is from 0.5 to 1% by weight, based on the weight of the fibre material.
The process of the present invention makes it possible to achieve an adequate sun protection factor in fibre material dyed or printed in any desired shade, an adequate sun protection facto
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Fuso Francesco
Hilfiker Rolf
Reinert Gerhard
Ciba Specialty Chemicals Corporation
Crichton David R.
Einsmann Margaret
Levine Jacob M.
Mansfield Kevin T.
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