CHLORINE-FREE BLEACHING OF CHEMICAL PULP INVOLVING A TWO STAGE TREATMENT WITH CHELATING AGENT - Patent 0720675

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EP 0 720 675 A1

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(43)	Date of publication:
	10.07.1996 Bulletin 1996/28

(21)	Application number: 94928521.0

(22)	Date of filing: 22.08.1994

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International Patent Classification (IPC):

D21C 9/ 10^{( . )}
D21C 9/ 16^{( . )}

D21C 9/ 153^{( . )}

(86)	International application number:
	PCT/SE1994/000758

(87)	International publication number:
	WO 1995/008666 (30.03.1995 Gazette 1995/14)

(84)	Designated Contracting States:
	AT DE ES FR PT SE

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Priority:

21.09.1993 SE 19930003066

(71)	Applicant: SUNDS DEFIBRATOR INDUSTRIES AKTIEBOLAG
	S-851 94 Sundsvall (SE)

(72)	Inventors:
	DAHL, M rten S-852 34 Sundsvall (SE) NORD N, Solveig S-860 20 Njurunda (SE)

(74)	Representative: Sundqvist, Hans
	Sunds Defibrator Industries Aktiebolag Patents Dept. Strandbergsgatan 61 S-112 51 Stockholm S-112 51 Stockholm (SE)

(54)	CHLORINE-FREE BLEACHING OF CHEMICAL PULP INVOLVING A TWO STAGE TREATMENT WITH CHELATING AGENT