Bleaching and dyeing; fluid treatment and chemical modification – Color protecting process for dyed product
Patent
1997-09-15
1999-06-22
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Color protecting process for dyed product
8490, 8685, 8688, 8690, 8661, 8566, 8570, 8589, D06P 362
Patent
active
059144440
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 direct dyes in the presence of at least one 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 climes, for example in Australia or America, however, the rate of skin damage due to UV radiation has lately been increasing. Accordingly, more attention is paid in these countries to protecting the skin from the sun's rays.
It has therefore been proposed that not only to protect the skin directly, but also to reduce the UV transmissivity of the clothing and also of other sun protection articles fabricated from cellulosic fibre materials, such as awnings or parasols. Most undyed fibre materials are at least partially transparent to UV radiation, so that the mere wearing of clothes does not offer adequate protection to the skin from damage due to UV radiation.
However, the results achieved hitherto 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 direct dyes and 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 direct dye and at least one UV absorber.
In the process of the present invention, the amounts in which the direct 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 UV absorbers 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 UV absorber used depends on the total amount of dye used. For instance, the amount of UV absorber used is from 0.2 to 5% by weight, in particular from 0.2 to 2% by weight, based on the weight of the fibre material, in the case of pale shades, from 0.05 to 0.2% 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 to 10% by weight, in particular from 2 to 5% by weight.
In a particularly preferred embodiment of the process of the present invention, the amount of direct dye used is from 0.2 to 2.0% by weight, based on the weight of the fibre material, and the amount of UV absorber used is from 0.05 to 0.2% 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 direct dye used is from 0.001 to 0.2% by weight, based on the weight of the fibre material, and the amount of UV absorber used is from 0.2 to 2% 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 factor being a sun protection factor with a value of at least 25.
Advantageously, the amount of direct dye used is selected so as to result in an increase of the sun protection factor of cellulosic fibre materials by at leas
REFERENCES:
patent: 3041330 (1962-06-01), Coleman et al.
patent: 3042669 (1962-07-01), Boyle et al.
patent: 4770667 (1988-09-01), Evans et al.
patent: 4775386 (1988-10-01), Reinert et al.
patent: 4831068 (1989-05-01), Reinert et al.
patent: 5197991 (1993-03-01), Rembold
patent: 5637348 (1997-06-01), Thompson et al.
patent: 5700295 (1997-12-01), Fuso et al.
patent: 5700394 (1997-12-01), Isharani et al.
Trotman, Dyeing and Chemical Technology of Textile Fibres, 6th edition, 1984, p. 353.
Fuso Francesco
Hilfiker Rolf
Reinert Gerhard
Ciba Specialty Chemicals Corporation
Crichton David R.
Einsmann Margaret
Mansfield Kevin T.
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