EP 4323586 A1 20240221 - METHOD FOR MANUFACTURING PAPER AND CARDBOARD
Title (en)
METHOD FOR MANUFACTURING PAPER AND CARDBOARD
Title (de)
VERFAHREN ZUR HERSTELLUNG VON PAPIER UND KARTON
Title (fr)
PROCEDE DE FABRICATION DE PAPIER ET DE CARTON
Publication
Application
Priority
- FR 2103912 A 20210415
- EP 2022059954 W 20220413
Abstract (en)
[origin: WO2022219086A1] The present invention relates to a method for manufacturing a sheet of paper or cardboard from a fibrous suspension, comprising the following steps: a) injecting a polymer P2 into a suspension of cellulose fibres; b) forming a sheet of paper or cardboard; and c) drying the sheet of paper or cardboard, the polymer P2 being prepared, prior to step a), from a water-soluble polymer P1 in the form of an invert emulsion, P1 consisting of at least one non-ionic monomer selected from acrylamide, methacrylamide, N,N-dimethylacrylamide and acrylonitrile, the polymer P1 being subjected to a reaction Re to give a polymer P2, the reaction Re consisting of adding the polymer P1 in the form of an invert emulsion in an aqueous solution M1 of: (i) an alkali hydroxide and/or an alkaline earth hydroxide, (ii) an alkali hypohalide and/or an alkaline earth hypohalide before a reaction time of 10 seconds to 5 hours.
IPC 8 full level
D21H 17/37 (2006.01); C08F 2/32 (2006.01); C08F 8/00 (2006.01); D21H 17/45 (2006.01); D21H 21/10 (2006.01)
CPC (source: EP US)
C08F 2/10 (2013.01 - EP); C08F 8/06 (2013.01 - EP); C08F 120/56 (2013.01 - EP US); D21H 17/375 (2013.01 - EP US); D21H 17/45 (2013.01 - EP); D21H 21/10 (2013.01 - EP US); D21H 21/18 (2013.01 - US); D21H 23/04 (2013.01 - US); C08F 2810/00 (2013.01 - US)
C-Set (source: EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2022219086 A1 20221020; AU 2022256771 A1 20231026; BR 112023021202 A2 20231219; CN 117203392 A 20231208; EP 4323586 A1 20240221; FR 3121942 A1 20221021; US 2024200270 A1 20240620
DOCDB simple family (application)
EP 2022059954 W 20220413; AU 2022256771 A 20220413; BR 112023021202 A 20220413; CN 202280028578 A 20220413; EP 22723053 A 20220413; FR 2103912 A 20210415; US 202218555480 A 20220413