Global Patent Index - EP 0831177 B1

EP 0831177 B1 20070725 - Hydrophilic dispersion polymers for paper applications

Title (en)

Hydrophilic dispersion polymers for paper applications

Title (de)

Hydrophile Dispersionspolymere für Papieranwendungen

Title (fr)

Polymères hydrophiles en dispersion pour applications papetières

Publication

EP 0831177 B1 20070725 (EN)

Application

EP 97116538 A 19970923

Priority

US 71928396 A 19960924

Abstract (en)

[origin: EP0831177A2] A papermaking process comprising forming an aqueous cellulosic papermaking slurry and adding a hydrophilic dispersion polymer to the slurry to increase retention and/or drainage is disclosed. The hydrophilic dispersion polymer comprises (a) a cationic monomer and (b) a second monomer represented by (meth)acrylamide (in an aqueous solution of a polyvalent anionic salt), wherein the polymerization is carried out in the presence of either an organic high-molecular weight multivalent cation comprising a water-soluble polymer containing at least one (a) monomer and/or poly diallyl dimethyl ammonium chloride (DADMAC). After addition of the polymers, the slurry is drained to form a sheet, and the sheet is dried.

IPC 8 full level

D21H 23/04 (2006.01); D21H 17/37 (2006.01); D21H 21/10 (2006.01); D21H 17/29 (2006.01); D21H 17/45 (2006.01); D21H 17/66 (2006.01)

CPC (source: EP)

D21H 21/10 (2013.01); D21H 23/04 (2013.01); D21H 17/29 (2013.01); D21H 17/375 (2013.01); D21H 17/455 (2013.01); D21H 17/66 (2013.01)

Citation (examination)

EP 0821099 A1 19980128 - NALCO CHEMICAL CO [US]

Designated contracting state (EPC)

DE ES FI FR GB IT SE

DOCDB simple family (publication)

EP 0831177 A2 19980325; EP 0831177 A3 20000105; EP 0831177 B1 20070725; AU 3918297 A 19980326; BR 9704862 A 19990119; CA 2216242 A1 19980324; CA 2216242 C 20060314; DE 69737945 D1 20070906; DE 69737945 T2 20071206; ES 2290960 T3 20080216; ID 18321 A 19980326; MX 9707246 A 19980830; MY 136998 A 20081231; NO 324301 B1 20070917; NO 974381 D0 19970923; NO 974381 L 19980325

DOCDB simple family (application)

EP 97116538 A 19970923; AU 3918297 A 19970923; BR 9704862 A 19970924; CA 2216242 A 19970923; DE 69737945 T 19970923; ES 97116538 T 19970923; ID 973261 A 19970923; MX 9707246 A 19970923; MY PI9704423 A 19970923; NO 974381 A 19970923