Controllable filler prefloculation using a dual polymer system
US8747617B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2012 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Apr 18, 2032 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of a first flocculating agent to an aqueous dispersion of filler particles followed by shearing of the dispersion, followed by addition of a second flocculating agent to the dispersion and further shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution. In addition, a neutralizing coagulant can be added to the dispersion to partially or completely neutralize the charge of the filler before the first flocculating agent is added.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.