EP 4323585 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 2103910 A 20210415
- EP 2022059953 W 20220413
Abstract (en)
[origin: WO2022219085A1] 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 fibrous suspension, b) forming a sheet of paper or cardboard, 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 solid particles, P1 being made up of at least one non-ionic monomer chosen from acrylamide, methacrylamide, N,N-dimethylacrylamide and acrylonitrile, the polymer P1 being subjected to a reaction Re to form a polymer P2, the reaction Re including adding and dissolving the solid polymer P1 particles in an aqueous solution M1 of: (i) an alkaline hydroxide and/or an alkaline-earth hydroxide, (ii) an alkaline hypohalide and/or an alkaline-earth hypohalide, prior to a reaction time of 10 seconds to 5 hours.
IPC 8 full level
D21H 17/37 (2006.01); C08F 8/00 (2006.01); D21H 17/45 (2006.01); D21H 21/10 (2006.01)
CPC (source: EP)
C08F 8/00 (2013.01); C08F 8/12 (2013.01); C08F 120/56 (2013.01); D21H 17/375 (2013.01); D21H 17/45 (2013.01); D21H 21/10 (2013.01)
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 2022219085 A1 20221020; AU 2022258761 A1 20231026; BR 112023021159 A2 20231219; CN 117396647 A 20240112; EP 4323585 A1 20240221; FR 3121941 A1 20221021
DOCDB simple family (application)
EP 2022059953 W 20220413; AU 2022258761 A 20220413; BR 112023021159 A 20220413; CN 202280028579 A 20220413; EP 22723052 A 20220413; FR 2103910 A 20210415