EP 0464993 B1 19950222 - process for control of pitch deposition from pulps in papermaking systems.
Title (en)
process for control of pitch deposition from pulps in papermaking systems.
Title (de)
Verfahren für Pechkontrolle in Papierherstellungssystemen.
Title (fr)
Procédé pour contrÔler le dépÔt de poix dans les systèmes pour fabriquer du papier.
Publication
Application
Priority
US 54237590 A 19900622
Abstract (en)
[origin: EP0464993A1] An improved process for controlling natural pitch deposition in pulp and papermaking aqueous systems involves the use of ampholytic polymers containing diallyl dimethyl ammonium quaternary salts and also containing (meth) acrylic acid salts and optionally containing (alkyl) acrylic acid esters or hydroxy esters. These ampholytic polymers give improved results in terms of control of natural pitch in the manufacture of pulp and paper.
IPC 1-7
IPC 8 full level
D21C 9/18 (2006.01); D21C 9/08 (2006.01); D21H 17/37 (2006.01); D21H 17/43 (2006.01); D21H 17/45 (2006.01); D21H 21/02 (2006.01)
CPC (source: EP)
D21H 17/37 (2013.01); D21H 17/43 (2013.01); D21H 17/455 (2013.01); D21H 21/02 (2013.01)
Citation (examination)
EP 0444788 A1 19910904 - NALCO CHEMICAL CO [US]
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0464993 A1 19920108; EP 0464993 B1 19950222; AT E118846 T1 19950315; AU 634054 B2 19930211; AU 7536991 A 19920102; CA 2040337 A1 19911223; CA 2040337 C 20031014; DE 69107529 D1 19950330; DE 69107529 T2 19950817; ES 2071216 T3 19950616; FI 106056 B 20001115; FI 911884 A0 19910418; FI 911884 A 19911223; JP 2955388 B2 19991004; JP H04241184 A 19920828
DOCDB simple family (application)
EP 91304199 A 19910509; AT 91304199 T 19910509; AU 7536991 A 19910423; CA 2040337 A 19910412; DE 69107529 T 19910509; ES 91304199 T 19910509; FI 911884 A 19910418; JP 10256491 A 19910508