Papermaking process
US6007679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1998 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Oct 14, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/68
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a paper making process in which improved drainage and retention is obtained by the addition of an effective amount of a cationic dispersion polymer to an aqueous cellulosic paper making slurry prior to shearing the slurry; which cationic dispersion polymer is selected from a group of copolymers consisting of: PA1 i) a copolymer of about 10 mole % DMAEA.BCQ and about 90 mole % AcAm; PA1 ii) a copolymer of about 10 mole % DMAEA.MCQ and about 90 mole % AcAm; and PA1 iii) a copolymer of about 20 mole % DMAEA.MCQ and about 80 mole % AcAm; and PA1 adding to the slurry, after said cationic dispersion polymer is added and the slurry is sheared, PA1 a microparticle selected from the group consisting of PA2 a) copolymers of acrylic acid and acrylamide; PA2 b) bentonite; and PA2 c) dispersed silica.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.