US Pat. No. 10,106,928

PAPER COMPOSITION

FiberLean Technologies Li...

1. A paper product comprising high energy thermomechanical pulp (TMP), low energy TMP, and microfibrillated cellulose, wherein the paper product comprises at least about 30% by weight high energy TMP and low energy and between 0.1% to 5% by weight of said microfibrillated cellulose TMP, based on the total weight of the paper product; wherein the weight ratio of high energy TMP to low energy TMP is from about 55:45 to about 50:50; wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50; wherein the low energy TMP has a Canadian standard freeness of from about 80 to about 130 cm3, and wherein the high energy TMP has a Canadian standard freeness of from 10 to 60 cm3; further wherein the paper product has a Bendtsen porosity of less than about 300 cm3 min?1.
US Pat. No. 10,100,467

PROCESS FOR THE MANUFACTURE OF STRUCTURED MATERIALS USING NANO-FIBRILLAR CELLULOSE GELS

FiberLean Technologies Li...

1. A process for manufacturing a structured material comprising the steps of:(a) providing cellulose fibres;
(b) providing at least one filler comprising calcium carbonate;
(c) combining the cellulose fibres of step a) and the at least one filler of step b) at a weight ratio of fibres to filler on a dry weight basis of from 1:33 to 10:1;
(d) fibrillating the cellulose fibres in an aqueous environment in the presence of the at least one filler from step c) until a nano-fibrillar gel is formed; wherein the formation of the gel is verified by monitoring the viscosity of the mixture in dependence of the shearing rate, wherein the viscosity decrease of the mixture upon step-wise increase of the shearing rate is larger than the corresponding viscosity increase upon subsequent step-wise reduction of the shearing rate over at least part of the shear rate range as shearing approaches zero;
(e) providing additional non-fibrillated fibres in the form of a fibre web;
(f) combining the nano-fibrillar gel of step d) with the non-fibrillated fibres in the form of a fibre web of step e), so that the combination of the nano-fibrillar gel and the non-fibrillated fibres includes 0.5 to 20 wt. % of the nano-fibrillar gel, expressed by the cellulosic content of the nano-fibrillar gel, on a dry/dry basis; and
(g) manufacturing a structured material from the combination of the nano-fibrillar gel and non-fibrillated fibres in the form of a fibre web.

US Pat. No. 10,294,371

PROCESS FOR THE PRODUCTION OF NANO-FIBRILLAR CELLULOSE GELS

FiberLean Technologies Li...

1. A nano-fibrillar cellulose gel obtained by the process comprising the steps of:(a) providing cellulose fibres contained in pulps selected from the group consisting of eucalyptus pulp, spruce pulp, pine pulp, beech pulp, hemp pulp, cotton pulp, or any mixture thereof;
(b) providing a filler;
(c) combining the cellulose fibres of step (a) and the filler; and
(d) fibrillating the cellulose fibres in an aqueous environment in the presence of the filler from step (c) until a nano-fibrillar cellulose gel is formed;
wherein the formation of the gel is verified by monitoring the viscosity of the mixture in dependence of the shearing rate, wherein the viscosity decrease of the mixture upon step-wise increase of the shearing rate is stronger than the corresponding viscosity increase upon subsequent step-wise reduction of the shearing rate over at least part of the shear rate range as shearing approaches zero;
wherein the filler is natural ground calcium carbonate,
wherein in step (d) the weight ratio of fibres to filler on a dry weight basis is from 1:33 to 10:1, wherein the Brookfield viscosity of the nano-fibrillar cellulose gel formed in step (d) is lower than the Brookfield viscosity of a corresponding nano-fibrillar cellulose suspension having been fibrillated in the absence of the filler.

US Pat. No. 10,214,859

PAPER AND PAPERBOARD PRODUCTS

FiberLean Technologies Li...

1. A method of making a paper or board product, the method comprising:(a) providing a wet web of pulp;
(b) providing a top ply slurry onto the wet web of pulp using an applicator suitable to form a film through a non-pressurized or pressurized slot opening on top of a wet substrate on the wire of the wet end of a paper machine, wherein:
the top ply slurry is provided in an amount ranging from 15 g/m2 to 40 g/m2;
(ii) the top ply slurry comprises a sufficient amount of microfibrillated cellulose to obtain a product having a top ply comprising at least about 5 wt. % to about 30 wt. % microfibrillated cellulose, based on the total weight of the top ply; and
(iii) the top ply slurry comprises a sufficient amount of inorganic particulate material to obtain a product having a top ply comprising at least 67 wt. % inorganic particulate material, based on the total weight of the top ply, wherein the inorganic particulate material has a particle size distribution in which at least 20 wt. % to at least 95 wt. % of the particles have an equivalent spherical diameter (e.s.d.) of less than 2 ?m.
US Pat. No. 10,053,817

PROCESS FOR THE MANUFACTURE OF STRUCTURED MATERIALS USING NANO-FIBRILLAR CELLULOSE GELS

FiberLean Technologies Li...

1. A process for manufacturing a structured material comprising the steps of:(a) providing cellulose fibres;
(b) providing at least one filler comprising calcium carbonate;
(c) combining the cellulose fibres of step a) and the at least one filler of step b) at a weight ratio of fibres to filler on a dry weight basis of from 1:33 to 10:1;
(d) fibrillating the cellulose fibres in an aqueous environment in the presence of the at least one filler from step c) until a nano-fibrillar cellulose gel is formed; wherein the formation of the gel is verified by monitoring the viscosity of the mixture in dependence of the shearing rate, wherein the viscosity decrease of the mixture upon step-wise increase of the shearing rate is larger than the corresponding viscosity increase upon subsequent step-wise reduction of the shearing rate over at least part of the shear rate range as shearing approaches zero;
(e) providing additional non-fibrillated fibres in the form of a fibre web; wherein before, during or after the addition of further non-fibrillated fibres in the form of a fibre web in step e), but after step d) and before step f), at least one further filler is added, wherein the at least one further filler and/or pigment comprises at least a fraction of particles having a median diameter d50 in the nanometer range;
(f) combining the nano-fibrillar gel of step d) with the non-fibrillated fibres in the form of a fibre web of step e), so that the combination of the nano-fibrillar cellulose gel and the non-fibrillated fibres in the form of a fibre web includes 0.5 to 20 wt. % of the nano-fibrillar cellulose gel, expressed by the cellulosic content of the nano-fibrillar cellulose gel, on a dry/dry basis; and
(g) manufacturing a structured material from the combination of the nano-fibrillar cellulose gel and non-fibrillated fibres in the form of a fibre web.

US Pat. No. 10,100,464

PAPER FILLER COMPOSITION

FiberLean Technologies Li...

11. A method for preparing an aqueous suspension comprising microfibrillated cellulose, the method comprising:providing a fibrous substrate comprising cellulose, wherein the fibrous substrate comprises cellulose having a Canadian Standard freeness equal to or less than 450 cm3;
microfibrillating the fibrous substrate in an aqueous environment by grinding in the presence of a grinding medium consisting essentially of mullite;
wherein the grinding is performed in a stirred media detritor,
wherein the grinding is carried out in the absence of grindable inorganic particulate material;
wherein the grinding medium is present in an amount of at least about 10% by volume of the aqueous environment, and
wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50.

US Pat. No. 10,301,774

PROCESS FOR THE PRODUCTION OF NANO-FIBRILLAR CELLULOSE SUSPENSIONS

FiberLean Technologies Li...

1. A nano-fibrillar cellulose suspension wherein cellulose fibres are at least partially broken down to primary fibrils obtained by the process comprising the steps of:(a) providing cellulose fibres contained in pulps selected from the group consisting of eucalyptus pulp, spruce pulp, pine pulp, beech pulp, hemp pulp, cotton pulp, or any mixture thereof;
(b) providing a filler, wherein the filler is natural ground calcium carbonate, and further wherein the filler has a median particle size of from 0.03 to 15 ?m;
(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) until the cellulose fibres are partially broken down to primary fibrils and the Schopper Riegler degree is increased at least 4° SR; wherein the fibrillating in step (d) is carried out by a device selected from an ultra-fine friction grinder, a refiner, or a homogenizer, and wherein in step (d) the weight ratio of fibres to filler on a dry weight basis is from 1:10 to 10:1.
US Pat. No. 10,253,457

COMPOSITIONS

FiberLean Technologies Li...

1. A paper product comprising a functional paper and a coating comprising at least about 5 wt. % of a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50.
US Pat. No. 10,309,060

PAPER COMPOSITION

FIBERLEAN TECHNOLOGIES LI...

1. A process for preparing a paper product, the process comprising: (i) combining high energy thermomechanical pulp (TMP), low energy TMP, and microfibrillated cellulose in appropriate amounts to form a papermaking composition; and (ii) forming the paper product from the papermaking composition; wherein the paper product comprises at least about 30% by weight high energy TMP and low energy and between 0.1% to 5% by weight of said microfibrillated cellulose TMP, based on the total weight of the paper product; wherein the weight ratio of high energy TMP to low energy TMP is from about 55:45 to about 50:50; wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50; wherein the low energy TMP has a Canadian standard freeness of from about 80 to about 130 cm3, and wherein the high energy TMP has a Canadian standard freeness of from 10 to 60 cm3; further wherein the paper product has a Bendtsen porosity of less than about 300 cm3 min?1.