Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product

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(11)

EP 1 591 578 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.01.2007 Bulletin 2007/04

(43)	Date of publication A2:
	02.11.2005 Bulletin 2005/44

(21)	Application number: 05008983.8

(22)	Date of filing: 25.04.2005

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International Patent Classification (IPC):

D06B 19/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR LV MK YU

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Priority:

28.04.2004 US 833450

(71)	Applicant: Gaston Systems, Incorporated
	Stanley, North Carolina 28164-2011 (US)

(72)	Inventors:
	Aurich Walter Clemson, South Carolina 29631 (US) Zeiffer Dieter Friedrich Iron Station, North Carolina 28080 (US) Neupert Hermann A. Belmont, North Carolina 28012 (US)

(74)	Representative: Patentanwälte Ruff, Wilhelm, Beier, Dauster & Partner
	Kronenstrasse 30 70174 Stuttgart 70174 Stuttgart (DE)

(54)	Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product

(57) Dyeing a cellulosic textile substrate (58) with reduced indigo dye (14) in a leuco state after foaming with an inert gas to maintain the dye (14) isolated from oxidizing substances. Following application of the foam to the substrate (58), it is exposed to the adjacent atmosphere, with the oxygen in the atmosphere oxidizing the reduced indigo dye (14) to regenerate it and cause it to affix to the textile substrate (58). A product can be produced using the method and apparatus of the present invention that has different dye characteristics on opposite surfaces of the substrate by applying the indigo dye foam to one surface and another dye, either an indigo dye or some other dye to the opposite surface.

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