Bleaching and dyeing; fluid treatment and chemical modification – Dye or potential dye composition – additive – treatment,... – Sulfur dye or vat dye
Patent
1995-04-04
1997-03-04
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Dye or potential dye composition, additive, treatment,...
Sulfur dye or vat dye
8922, 8924, 8925, 8926, 8921, D06P 122, D06P 324, D06P 340, D06P 352
Patent
active
056074832
ABSTRACT:
A method is provide for dyeing a non-cellulosic organic material with a dye, preferably a vat dye, comprising (a) treating the material with a dye in the presence of a reducing agent and an alkali and (b) oxidising the treated material produced in step (a) characterised in that the concentration of reducing agent used in step (a) is increased above that used for conventional vat dyeing such that the resultant dyed material has a lightfastness of 5 or more by BS1006 B01 and B02 (1978) and/or has a washfastness of 5 or more by British Standard Test BS1006 CO6.C2 (1981). Preferably the step (a) is carried out in the presence of an alkali in concentration of greater than 0.1 molar, more preferably a concentration of 0.2 molar or more and most preferably greater than 1 molar.
The method provides vat dyed non-cellulosic organic materials having a reflectance of infra-red light of wavelength 400 nm to 680 nm of less than 15%.
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patent: 4283194 (1981-08-01), Teague et al.
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patent: 4699627 (1987-10-01), Bailey
patent: 5244470 (1993-09-01), Onda et al.
Baumgarte Melliand Textile Reports, Mar. 1987, pp. 189-195 "Reduction and Oxidation processes in Dyeing with Vat Dyes".
Baumgarte Melliand Textile Reports 68 (1987) pp. 187-195 "Reduction and Oxidation processes in Dyeing with Vat Dyes".
Baumgarte 4052 Review of Progress in . . . 17 (1987) "Developments in Vat Dyes and in their appication 1974-1986".
Aspland 2248 Textile Chemist and Colorist 24 (1992) Jan., No. 1, Triangle Park, NC "Chapter 3: Vat Dyes and their Application".
Brown Philip J.
Burkinshaw Stephen M.
Einsmann Margaret
The Secretary of State for Defence in her Britannic Majesty's Go
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