EP 0249891 B1 19900822 - PROCESS FOR PRODUCING PAPER AND CARDBOARD
Title (en)
PROCESS FOR PRODUCING PAPER AND CARDBOARD
Publication
Application
Priority
DE 3620065 A 19860614
Abstract (en)
[origin: US4772359A] Paper, board and cardboard are produced by draining a pulp slurry in the presence of high molecular weight, water-soluble polymers of N-vinylamides as drainage aids, retention agents and flocculants. These polymers are particularly effective in a pulp slurry which has a high content of interfering substances and other phenolic compounds.
IPC 1-7
IPC 8 full level
D21H 17/23 (2006.01); D21H 17/34 (2006.01); D21H 17/37 (2006.01); D21H 17/47 (2006.01); D21H 17/55 (2006.01); D21H 23/76 (2006.01)
CPC (source: EP US)
D21H 17/34 (2013.01 - EP US); D21H 17/37 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0249891 A1 19871223; EP 0249891 B1 19900822; AT E55789 T1 19900915; AU 586781 B2 19890720; AU 7418387 A 19871217; CA 1287453 C 19910813; DE 3620065 A1 19871217; DE 3764407 D1 19900927; FI 872610 A0 19870611; FI 872610 A 19871215; FI 88062 B 19921215; FI 88062 C 19930325; JP 2605043 B2 19970430; JP S62299600 A 19871226; NO 166735 B 19910521; NO 166735 C 19910828; NO 872454 D0 19870612; NO 872454 L 19871215; NZ 220553 A 19890106; US 4772359 A 19880920; ZA 874222 B 19890222
DOCDB simple family (application)
EP 87108446 A 19870611; AT 87108446 T 19870611; AU 7418387 A 19870612; CA 538060 A 19870527; DE 3620065 A 19860614; DE 3764407 T 19870611; FI 872610 A 19870611; JP 14541787 A 19870612; NO 872454 A 19870612; NZ 22055387 A 19870604; US 5535487 A 19870529; ZA 874222 A 19870612