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Current content: 159 679 824 patent documents

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164 112 new documents added

576 445 documents amended

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EP 0141355 B1 19880601 - PROCESS FOR BLEACHING GROUND WOOD PULP

Title (en)

PROCESS FOR BLEACHING GROUND WOOD PULP

Publication

EP 0141355 B1 19880601 (DE)

Application

EP 84112648 A 19841019

Priority

DE 3338260 A 19831021

Abstract (en)

[origin: EP0141355A1] 1. Process for the bleaching of mechanical wood pulp in peroxide solutions, characterized in that one carries out the bleaching procedure without silicates in the presence of 1.phosphonic acids or their salts, 2. gluconic acid, citric acid, N,N-dihydroxyethyleneglycine, DTPA, EDTA, NTA or their mixtures or salts and 3. phosphoric acid or its salts.

IPC 1-7

D21C 9/10

IPC 8 full level

C11D 3/39 (2006.01); D21C 9/10 (2006.01)

CPC (source: EP)

C11D 3/394 (2013.01); D21C 9/1042 (2013.01)

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0141355 A1 19850515; EP 0141355 B1 19880601; AT E34790 T1 19880615; DE 3338260 C1 19850725; DE 3471705 D1 19880707

DOCDB simple family (application)

EP 84112648 A 19841019; AT 84112648 T 19841019; DE 3338260 A 19831021; DE 3471705 T 19841019