US 10,982,387 B2
Process for the production of nano-fibrillar cellulose suspensions
Patrick A. C. Gane, Rothrist (CH); Joachim Schoelkopf, Killwangen (CH); Daniel Gantenbein, Elnesvagen (NO); Michel Schenker, Schönenwerd (CH); Michael Pohl, Villach (AT); and Beat Kübler, Oberwil (CH)
Assigned to FiberLean Technologies Limited, Par (GB)
Filed by FiberLean Technologies Limited, Par (GB)
Filed on Apr. 11, 2019, as Appl. No. 16/381,754.
Application 16/381,754 is a continuation of application No. 14/474,705, filed on Sep. 2, 2014, granted, now 10,301,774, issued on May 28, 2019.
Application 14/474,705 is a continuation of application No. 13/138,647, granted, now 8,871,057, issued on Oct. 28, 2014, previously published as PCT/EP2010/054231, filed on Mar. 30, 2010.
Claims priority of provisional application 61/212,108, filed on Apr. 6, 2009.
Claims priority of application No. 09156683 (EP), filed on Mar. 30, 2009.
Prior Publication US 2019/0234017 A1, Aug. 1, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. D21C 9/00 (2006.01); D21D 1/00 (2006.01); D21H 11/18 (2006.01); D21B 1/16 (2006.01); D21H 17/67 (2006.01); D21H 15/04 (2006.01)
CPC D21C 9/007 (2013.01) [D21B 1/16 (2013.01); D21D 1/00 (2013.01); D21H 11/18 (2013.01); D21H 17/675 (2013.01); D21H 15/04 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A process for the production of a nano-fibrillar cellulose suspension comprising the steps of:
(a) providing cellulose fibres, wherein all or part of the cellulose fibres may be obtained from a recycled pulp;
(b) providing a filler; wherein the filler is selected from the group consisting of precipitated calcium carbonate (PCC); natural ground calcium carbonate (GCC); dolomite; talc; bentonite; clay; magnesite; satin white; sepiolite, huntite, diatomite; silicates; and mixtures thereof;
(c) combining the cellulose fibres from step (a) and the filler from step (b); and
(d) fibrillating the cellulose fibres and the filler from step (c) to obtain a nano-fibrillar cellulose suspension,
wherein in step (d) the weight ratio of fibres to filler on a dry weight basis is from 1:10 to 10:1.