EP 0268729 B1 19920513 - PRODUCTION OF HIGH BULK CALENDERED PAPER CONTAINING VESICULATED BEADS
Title (en)
PRODUCTION OF HIGH BULK CALENDERED PAPER CONTAINING VESICULATED BEADS
Publication
Application
Priority
US 92851586 A 19861110
Abstract (en)
[origin: EP0268729A1] A high bulk calendered paper comprises from 2% to about 6% of the weight of the paper of highly cross-linked, titanium dioxide-pigmented, polymeric vesiculated beads having a volume average particle size of at least about 5 microns up to about 35 microns. The calendered paper preferably has a basis weight of from about 20 to about 40 pounds per ream, and the vesiculated beads are preferably used in an amount of from 4% to 6%. As a feature of the invention, it is found that the carboxyl-functional cross-linked beads used herein when used in aqueous suspension thickened with a neutralized polycarboxylic acid polymer thickener, enhance the retention of fines in the papermaking process when used in conjunction with anionic retention aids, especially carboxyl-functional acrylamide copolymers, and particularly when used in an aqueous furnish having a pH of from 4 to 6.
IPC 1-7
IPC 8 full level
D21G 1/00 (2006.01); D21H 17/37 (2006.01); D21H 17/53 (2006.01); D21H 17/67 (2006.01); D21H 17/69 (2006.01); D21H 21/54 (2006.01)
CPC (source: EP)
D21H 17/375 (2013.01); D21H 17/53 (2013.01); D21H 17/69 (2013.01); D21H 21/54 (2013.01)
Designated contracting state (EPC)
BE DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0268729 A1 19880601; EP 0268729 B1 19920513; CA 1286061 C 19910716; DE 3779055 D1 19920617; FI 872207 A0 19870520; FI 872207 A 19880511; FI 88734 B 19930315; FI 88734 C 19930628; JP S63126996 A 19880530
DOCDB simple family (application)
EP 87105030 A 19870404; CA 533890 A 19870406; DE 3779055 T 19870404; FI 872207 A 19870520; JP 11438187 A 19870511