PROCESS FOR PRODUCING PAPER AND CARDBOARD

PCT No. PCT/EP97/03574 Sec. 371 Date Jan. 8, 1999 Sec. 102(e) Date Jan. 8, 1999 PCT Filed Jul. 7, 1997 PCT Pub. No. WO98/01623 PCT Pub. Date Jan. 15, 1998Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first (a) polyethyleneimi...

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Main Authors MEIXNER, HUBERT, DIRKS, BERND, DYLLICK-BRENZINGER, RAINER, BAUMANN, PETER, LINHART, FRIEDRICH, MOENCH, DIETMAR, GERBER, KLAUS-DIETER
Format Patent
LanguageEnglish
French
German
Published 28.04.1999
Edition6
Subjects
IMPREGNATING OR COATING OF PAPER
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Summary:PCT No. PCT/EP97/03574 Sec. 371 Date Jan. 8, 1999 Sec. 102(e) Date Jan. 8, 1999 PCT Filed Jul. 7, 1997 PCT Pub. No. WO98/01623 PCT Pub. Date Jan. 15, 1998Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first (a) polyethyleneimines having a molar mass Mw of more than 500,000 or polymers containing vinylamine units and having a molar mass of from 5000 to 3 million and then (b) cationic polyacrylamides or polymers containing vinylamine units, the molar masses Mw of the polymers each being at least 4 million, are added to the pulps, and the pulp is then subjected to at least one shearing stage and is flocculated by adding bentonite, colloidal silica or clay.
Bibliography:Application Number: EP19970930506