EP 0301372 B1 19910918 - PROCESS FOR PRODUCING PAPER AND BOARD HAVING A GREAT DRY STRENGTH
Title (en)
PROCESS FOR PRODUCING PAPER AND BOARD HAVING A GREAT DRY STRENGTH
Publication
Application
Priority
DE 3724646 A 19870725
Abstract (en)
[origin: EP0301372A1] In the process, an agent which confers dry strength and can be obtained by mixing enzymatically degraded starch having a viscosity of 20 to 2,000 m Pa.s (determined on a 7.5% strength solution in water at 45 DEG C) with cationic polymers which contain, in copolymerised form, a) diallyldimethylammonium chloride b) N-vinylamine or c) optionally substituted N-vinylimidazolines as characteristic monomers, the K-value of the cationic polymers being at least 30, is added to the paper stock and the stock is dewartered, during sheet formation.
IPC 1-7
IPC 8 full level
D21H 17/34 (2006.01); D21H 17/28 (2006.01); D21H 17/45 (2006.01); D21H 21/18 (2006.01)
CPC (source: EP KR US)
D21H 17/28 (2013.01 - EP US); D21H 17/455 (2013.01 - EP US); D21H 21/14 (2013.01 - KR); D21H 21/18 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0301372 A1 19890201; EP 0301372 B1 19910918; AT E67538 T1 19911015; AU 1929488 A 19890127; AU 593422 B2 19900208; CA 1302021 C 19920602; DE 3724646 A1 19890202; DE 3864938 D1 19911024; DK 170826 B1 19960129; DK 407888 A 19890126; DK 407888 D0 19880721; ES 2024596 B3 19920301; FI 883504 A0 19880725; FI 883504 A 19890126; FI 92083 B 19940615; FI 92083 C 19940926; JP 2596593 B2 19970402; JP S6440694 A 19890210; KR 890002493 A 19890410; NO 172402 B 19930405; NO 172402 C 19930714; NO 883274 D0 19880722; NO 883274 L 19890126; NZ 225536 A 19890927; US 4940514 A 19900710
DOCDB simple family (application)
EP 88111572 A 19880719; AT 88111572 T 19880719; AU 1929488 A 19880722; CA 572015 A 19880714; DE 3724646 A 19870725; DE 3864938 T 19880719; DK 407888 A 19880721; DK 407888 D 19880721; ES 88111572 T 19880719; FI 883504 A 19880725; JP 18373288 A 19880725; KR 880009394 A 19880725; NO 883274 A 19880722; NZ 22553688 A 19880722; US 22333488 A 19880725