INHIBITION OF PULP AND PAPER YELLOWING USING HYDROXYLAMINES AND OTHER COADDITIVES - Patent 1131483

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EP 1 131 483 A1

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(43)	Date of publication:
	12.09.2001 Bulletin 2001/37

(21)	Application number: 99953767.3

(22)	Date of filing: 11.10.1999

(51)	International Patent Classification (IPC)⁷: D21C 9/00, D21H 21/14, D21H 17/07

(86)	International application number:
	PCT/EP9907/594

(87)	International publication number:
	WO 0024/963 (04.05.2000 Gazette 2000/18)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

22.10.1998 US 177016
20.01.1999 US 234253
20.01.1999 US 116688 P

(71)	Applicant: Ciba Specialty Chemicals Holding Inc.
	4057 Basel (CH)

(72)	Inventors:
	SELTZER, Raymond New City, NY 10956 (US) DEVORE, David Nyack, NY 10960 (US) CUNKLE, Glen, Thomas Stamford, CT 06903 (US) HEITNER, Cyril Pierrefonds, Quebec H9H 2L2 (CA) SCHMIDT, John, Alois L'ile Bizard, Quebec H9C 1L2 (CA) MCGARRY, Peter, Francis L'ile Bizard, Quebec H9C 1L2 (CA) WOLF, Jean-Pierre CH-4464 Maisprach (CH) NELSON, Randall, Bruce Seattle, WA 98122 (US)

(54)	INHIBITION OF PULP AND PAPER YELLOWING USING HYDROXYLAMINES AND OTHER COADDITIVES