EP 0362770 A2 19900411 - Dry strength additive for paper.
Title (en)
Dry strength additive for paper.
Title (de)
Trockenfestigkeitszusatz für Papier.
Title (fr)
Additif de résistance à sec pour papier.
Publication
Application
Priority
US 25233388 A 19881003
Abstract (en)
A mixture of cationic and anionic polymers useful as a strengthening additive in papermaking processes that comprises a water-soluble, linear, cationic polymer having a reduced specific viscosity greater than 2 dl/g and a charge density of 0.2 to 4 meq/g, and a water-soluble, anionic polymer having a charge density of less than 5 meq/g that is reactable in the presence of water with the cationic polymer to form a polyelectrolyte complex, processes for making the mixture, and its use, are disclosed.
IPC 1-7
D21H 17/32; D21H 17/42; D21H 17/45; D21H 17/72; D21H 21/18; D21H 23/02
IPC 8 full level
C08L 101/00 (2006.01); D21H 17/23 (2006.01); D21H 17/24 (2006.01); D21H 17/25 (2006.01); D21H 17/32 (2006.01); D21H 17/37 (2006.01); D21H 17/42 (2006.01); D21H 17/43 (2006.01); D21H 17/45 (2006.01); D21H 21/16 (2006.01); D21H 21/18 (2006.01); D21H 21/50 (2006.01)
CPC (source: EP)
D21H 17/32 (2013.01); D21H 17/42 (2013.01); D21H 17/43 (2013.01); D21H 17/455 (2013.01); D21H 21/18 (2013.01)
Designated contracting state (EPC)
AT BE DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0362770 A2 19900411; EP 0362770 A3 19910109; EP 0362770 B1 19940727; AT E109230 T1 19940815; AU 4252389 A 19900405; AU 619599 B2 19920130; BR 8905018 A 19900508; DE 68917069 D1 19940901; DE 68917069 T2 19941208; ES 2059664 T3 19941116; FI 894684 A0 19891003; FI 894684 A 19900404; FI 98941 B 19970530; FI 98941 C 19970910; JP 2862913 B2 19990303; JP H02251696 A 19901009; KR 0159921 B1 19990115; KR 900006615 A 19900508; RU 2040618 C1 19950725; ZA 897516 B 19900926
DOCDB simple family (application)
EP 89118245 A 19891002; AT 89118245 T 19891002; AU 4252389 A 19891003; BR 8905018 A 19891003; DE 68917069 T 19891002; ES 89118245 T 19891002; FI 894684 A 19891003; JP 25534389 A 19891002; KR 890014136 A 19890930; SU 4742293 A 19891002; ZA 897516 A 19891003