EP 1173641 A1 20020123 - AN ACID COLLOID IN A MICROPARTICLE SYSTEM USED IN PAPERMAKING
Title (en)
AN ACID COLLOID IN A MICROPARTICLE SYSTEM USED IN PAPERMAKING
Title (de)
SAURES KOLLOID IN EINEM MIKROTEILCHENSYSTEM FÜR DIE PAPIERHERSTELLUNG
Title (fr)
COLLOIDE ACIDE DANS UN SYSTEME MICROPARTICULAIRE UTILISE EN PAPETERIE
Publication
Application
Priority
- US 9920766 W 19990908
- US 10137798 P 19980922
Abstract (en)
[origin: WO0017451A1] A microparticle system for use as a retention and drainage aid in the production of alkaline and acid paper products comprises a HMW flocculant polymer (6), an acid colloid (7), and a coagulant or a MMW flocculant (5). The acid colloid (7) comprises an aqueous solution of a water soluble polymer or copolymer of melamine aldehyde, preferably melamine formaldehyde, and is present in an amount ranging between 0.0005 % to 0.5 % by weight based on the dry weight of the solids in the furnish. The HMW flocculant polymer (6) may be added to stock or furnish after the fan pump; and prior to the pressure screen (2); the acid colloid (7) may be added to the stock after the pressure screen (2), and the coagulant/MMW flocculant (5) may be added prior to the fan pump (1). Alternatively, this sequence of chemical additions can be changed, i.e. the acid colloid (7) can be added prior to or after the fan pump (1) or prior to the pressure screen (2). Addition of the microparticle system to the paper furnish improves retention, drainage and sheet formation during the papermaking process.
IPC 1-7
D21H 21/10; D21H 23/02; D21H 17/45; D21H 17/47; D21H 17/51; D21H 17/55; D21H 17/63; D21H 17/68; C02F 5/10; D21H 23/76
IPC 8 full level
B01D 21/01 (2006.01); D21H 17/47 (2006.01); D21H 17/51 (2006.01); D21H 21/10 (2006.01); D21H 23/14 (2006.01); D21H 17/49 (2006.01); D21H 17/55 (2006.01); D21H 17/56 (2006.01); D21H 17/68 (2006.01); D21H 23/04 (2006.01)
CPC (source: EP KR)
D21H 21/10 (2013.01 - EP KR); D21H 17/49 (2013.01 - EP); D21H 17/51 (2013.01 - EP); D21H 17/55 (2013.01 - EP); D21H 17/56 (2013.01 - EP); D21H 17/68 (2013.01 - EP); D21H 23/04 (2013.01 - EP); D21H 23/14 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0017451 A1 20000330; AU 5917399 A 20000410; AU 761303 B2 20030605; BR 9913992 A 20010703; CN 1318121 A 20011017; EP 1173641 A1 20020123; EP 1173641 A4 20020123; ID 29633 A 20010906; JP 2002526681 A 20020820; KR 20010075219 A 20010809; NO 20011442 D0 20010321; NO 20011442 L 20010522; NZ 510318 A 20030725
DOCDB simple family (application)
US 9920766 W 19990908; AU 5917399 A 19990908; BR 9913992 A 19990908; CN 99810866 A 19990908; EP 99946856 A 19990908; ID 20010669 A 19990908; JP 2000574346 A 19990908; KR 20017003546 A 20010320; NO 20011442 A 20010321; NZ 51031899 A 19990908