WO2011051882A1 - Process for production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process - Google Patents

Process for production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process Download PDF

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Publication number
WO2011051882A1
WO2011051882A1 PCT/IB2010/054839 IB2010054839W WO2011051882A1 WO 2011051882 A1 WO2011051882 A1 WO 2011051882A1 IB 2010054839 W IB2010054839 W IB 2010054839W WO 2011051882 A1 WO2011051882 A1 WO 2011051882A1
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WO
WIPO (PCT)
Prior art keywords
fibers
extruder
microfibrillated cellulose
slurry
process according
Prior art date
Application number
PCT/IB2010/054839
Other languages
French (fr)
Inventor
Isto Heiskanen
Ali Harlin
Kaj Backfolk
Risto Laitinen
Original Assignee
Stora Enso Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to US13/503,871 priority Critical patent/US8747612B2/en
Priority to EP10826211.4A priority patent/EP2494107B1/en
Priority to BR112012009802A priority patent/BR112012009802A2/en
Publication of WO2011051882A1 publication Critical patent/WO2011051882A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres

Definitions

  • the invention relates to process for the production of microfibrillated cellulose by the aid of an extruder.
  • Cellulosic fibers are multi-component structures made from cellulose polymers, i.e. cellulose chains. Lignin, pentosans, hemicelluloses and other components known in art may also be present.
  • the cellulose chains in the fibers are attached to each other to form elementary fibrils.
  • Several elementary fibrils are bound to each other to form microfibrils and several microfibrils form aggregates.
  • the links between the cellulose chains, elementary- and microfibrils are hydrogen bonds .
  • Microfibrillated cellulose also known as MFC
  • nanocellulose is a material made from wood cellulose fibers, agricultural raw materials or waste products, where the individual microfibrils have been partly or totally detached from each other. Other raw materials can also be used to produce nano or microfibrils.
  • MFC is normally very thin (-20 nm) and the length is often between 100 nm to 10 ⁇ . However, the microfibrils may also be longer, for example between 10-100 ⁇ but lengths up to 200 ⁇ can also be used. Fibers that has been fibrillated and which have microfibrils on the surface and microfibrils that are separated and located in a water phase of a slurry are included in the definition MFC.
  • MFC can be produced in a number of different ways. It is possible to mechanically treat cellulosic fibers so that microfibrils are formed. However, it is very energy consuming method to for example shred or refine the fibers and it is therefore not often used without combining the treatment with a pre- or post- treatment.
  • WO2007091942 In the method described in WO20070912942, the MFC is produced by the aid of refining in combination with addition of an enzyme.
  • the invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, conducting the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. In this way it has been shown that microfibrillated cellulose can be produced in a very energy efficient way.
  • At least one modifying chemical is preferably added to the extruder during treatment of the slurry, so that modified microfibrillated cellulose is formed.
  • the use of an extruder for defibrillation of the fibers makes it possible to add a modifying chemical during defibrillation, i.e. at the same time.
  • the design of the extruder thus allows both defibrillation of the fibers and mixing of the fibers with a chemical. Modified or functionalized microfibrillated cellulose can thus be produced in an improved and energy efficient way in a single process step.
  • the added modifying chemical will preferably modify the surface of the microfibrillated cellulose and/or the modifying chemical will be incorporated into the treated fibers.
  • the fibers being treated in the extruder will soften and/or expand and the addition of a chemical will thus react with the fibers either by modifying the fibers on the surface or by being incorporated into the softened and/or expanded fibers.
  • the modifying chemical is preferably any of carboxymethyl cellulose (CMC), methyl cellulose, polyvinyl alcohol, calcium stearate, alcohols, different specific and non-specific salts, starch, surfactants, tensides and/or AKD or other hydrophobic chemicals .
  • the modifying chemical may also be an oxidative chemical, preferably hydrogen peroxide.
  • the extruder is preferably a conical extruder.
  • the use of a conical extruder is beneficial since the defibrillation of the fibers and mixing with an eventual chemical is very good and efficient.
  • the solid content of the slurry comprising the fibers being treated in the extruder may be above 30wt%, preferably above 50wt%. Due to the flow dynamics in the extruder, above all in a conical extruder, it is possible to increase the dry content of the slurry comprising the fibers to be treated.
  • the fibers of the slurry may be pre-treated before being conducted to the extruder. It is preferred that the fibers are pre-treated with an enzyme before being conducted and further treated in the extruder.
  • the invention further relates to microfibrillated
  • the extruder can be of any kind, for example a single screw, twin screw or conical extruder. It is preferred to use a conical extruder since it has been shown that the high shear forces in a conical extruder results in the production of microfibrillated cellulose in a very energy efficient way.
  • the conical extruder also makes it possible to control the length of the produced microfibrillated cellulose in a good way.
  • Conical extruders are traditionally used for application of single or multilayer polymer layers on a co-axial products, profiles and multi-layered films. It can also be used for mixing materials together, such as wood plastics and natural fiber compounds with polymers but not typically targeting actual process of dispersive compounding.
  • the typical design of the conical extruder is that its rotor (screw) is in the form of a cone. The temperature during the treatment is increased and the optimal temperature depends both on the material used and on the time needed for the fibers to pass the extruder.
  • the dry solid content of the fibers fed into the extruder can be very high, typically above 30wt% and even preferably above 50wt%.
  • the produced MFC will thus have increased dry content. This often is beneficial in later usage of the microfibrillated cellulose. If it is
  • the produced MFC it is advantageous to have a high dry content in order to avoid transporting large amounts of water. Also, if the produced MFC is added to surface of for example a paper or board web it is preferred to have high dry content in order to reduce the drying demands of the paper or board.
  • the fibers are preferably modified.
  • the modification is preferably done by addition of a modifying chemical.
  • Cellulosic fibers can be modified in many different ways in order to alter the properties of the fibers, i.e. to functionalize the fibers.
  • the fibers can for example be carboxylized, oxidized or be made cationic.
  • Surface modification can either be made by a direct surface reaction resulting in a modification or by indirect modification through adsorption of one or several polymers.
  • modified fibers By addition of a modifying chemical to the extruder according to the invention it is possible to modify the fibers at the same time as defibrillation, i.e. in an already existing process step. The modification can thus be done much faster and in a more energy efficient way.
  • Another advantage by using an extruder when modifying the fibers is that it is possible to modify both the inner and outer regions of the fibers in the extruder at the same time as the fibers are defibrillated and MFC is produced.
  • a normal chemical modification step of microfibrillated cellulose may have the disadvantage of producing varying quality grade fibers partly because of preferred adsorption of chemical to the outer fiber surfaces.
  • the modification is done by addition of the appropriate chemical to the extruder.
  • the fibers which are treated in the extruder are softened and expanded during the treatment and the addition of a chemical will result in a reaction between the fiber and the chemical.
  • the reaction will result in that the fiber is modified, either by modifying the surface of the fibers and/or the chemical may be incorporated into the softened and expanded fiber.
  • CMC carboxymethyl cellulose
  • methyl cellulose polyvinyl alcohol
  • calcium stearate alcohols
  • alcohols different specific and non-specific salts
  • starch starch
  • surfactants and/or AKD or other hydrophobic chemicals.
  • modification chemical agents might be used and or process chemical aids such as tensides or alcohol or electrolytes (salts) . Some of the chemicals like CMC might also have dual effects such as surface modification and lubrication effect. It is also possible to oxidize the produced fibers by addition of an oxidative chemical, for example by addition of hydrogen peroxide, sodium hypochlorite, calcium hypochlorite, ammonium persulfate. It is also possible to use acids in order to modify the fibers, for example hydrochloric acid or sulphuric acid. The mentioned chemicals may either be added alone or in combination with one or more chemicals.
  • starch may be pre-cooked or uncooked. If the fibers comprises starch, either naturally, e.g. potato fibers or by addition the present starch may be cooked during the treatment in the extruder. In these cases it is thus preferred to add uncooked starch.
  • cationization, carboxymethylation etc. can be done in an extruder. Also chemical breaching of cellulose can be done.
  • fibers are cationized it is possible to use the produced modified MFC both as a strength enhancement and as a retention chemical.
  • a cationized MFC might also be of advantage when used in the size press. Here its cationic nature might have positive effect on the interaction with certain inks, such as anionic dye or pigment based inkjet inks.
  • modified MFC can be used for hydrofobization of papers and board or composites.
  • Other additives may also be used. These additives fed to the extruder may have affinity against cellulose and have ability to reduce internal friction of the fibers by means of organizing itself efficiently on cellulose surfaces enabling plasticization and elongations flow of the fibers under shear.
  • Another big advantage with the present invention is that it is possible to produce a composite in one process step. It is possible to add a waste material and fibers to the extruder and thereafter treat the mixture in the extruder producing a composite comprising of waste material and microfibrillated cellulose.
  • the waste material may be filler, clay, polymer, sawdust and/or recycled fiber based package, such as liquid package waste comprising polymer and/or aluminum.
  • the fibers which are added to the extruder may be pre- treated, for example by refining or addition of chemicals or enzymes . It is preferred that the fibers are enzymatic pre-treated before being fed to the extruder. It is also possible to add enzymes during the treatment in the extruder. However, the temperature must then be kept low and it is also necessary to increase the time in the extruder so that the enzymes can decompose the fibers in the desired way.
  • microfibrillated cellulose after the extruder in order to produce an even finer material, such as small nanocellulose . It is much easier and less energy demanding to treat the fibers, for example mechanically, after they have passed the extruder and being both defibrillated and optionally also modified.
  • the fibers are preferable cellulosic fibers. Both hardwood and/or softwood cellulosic fibers may be treated. Other raw materials such as cotton, agricultural or fibers from cereals can also be used. However, the fibers may also be other type of fibers such as agricultural fibers for example potato fibers.
  • microfibrillated cellulose produced according to the process results in more curled microfibrillated cellulose.
  • the fibers, and above all the larger microfibrillated cellulose fibers tend to curl which depending on the end use may be beneficial .

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Artificial Filaments (AREA)
  • Paper (AREA)

Abstract

The present invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, adding the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. The invention further relates to a microfibrillated cellulose produced.

Description

Process for production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process
Field of the invention
The invention relates to process for the production of microfibrillated cellulose by the aid of an extruder.
Background
Cellulosic fibers are multi-component structures made from cellulose polymers, i.e. cellulose chains. Lignin, pentosans, hemicelluloses and other components known in art may also be present. The cellulose chains in the fibers are attached to each other to form elementary fibrils. Several elementary fibrils are bound to each other to form microfibrils and several microfibrils form aggregates. The links between the cellulose chains, elementary- and microfibrils are hydrogen bonds .
Microfibrillated cellulose (MFC) (also known as
nanocellulose ) is a material made from wood cellulose fibers, agricultural raw materials or waste products, where the individual microfibrils have been partly or totally detached from each other. Other raw materials can also be used to produce nano or microfibrils. MFC is normally very thin (-20 nm) and the length is often between 100 nm to 10 μπι. However, the microfibrils may also be longer, for example between 10-100 μιη but lengths up to 200μιτι can also be used. Fibers that has been fibrillated and which have microfibrils on the surface and microfibrils that are separated and located in a water phase of a slurry are included in the definition MFC.
MFC can be produced in a number of different ways. It is possible to mechanically treat cellulosic fibers so that microfibrils are formed. However, it is very energy consuming method to for example shred or refine the fibers and it is therefore not often used without combining the treatment with a pre- or post- treatment.
One example of production of MFC is described in
WO2007091942. In the method described in WO20070912942, the MFC is produced by the aid of refining in combination with addition of an enzyme.
However, there is still a need for an improved process for the production of MFC.
Summary of Invention
It is an object of the present invention to provide a process for the production of microfibrillated cellulose in an improved way.
This object, as well as other objects and advantages, is achieved by the process according to claim 1. The invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, conducting the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. In this way it has been shown that microfibrillated cellulose can be produced in a very energy efficient way.
At least one modifying chemical is preferably added to the extruder during treatment of the slurry, so that modified microfibrillated cellulose is formed. The use of an extruder for defibrillation of the fibers makes it possible to add a modifying chemical during defibrillation, i.e. at the same time. The design of the extruder thus allows both defibrillation of the fibers and mixing of the fibers with a chemical. Modified or functionalized microfibrillated cellulose can thus be produced in an improved and energy efficient way in a single process step.
The added modifying chemical will preferably modify the surface of the microfibrillated cellulose and/or the modifying chemical will be incorporated into the treated fibers. The fibers being treated in the extruder will soften and/or expand and the addition of a chemical will thus react with the fibers either by modifying the fibers on the surface or by being incorporated into the softened and/or expanded fibers. The modifying chemical is preferably any of carboxymethyl cellulose (CMC), methyl cellulose, polyvinyl alcohol, calcium stearate, alcohols, different specific and non-specific salts, starch, surfactants, tensides and/or AKD or other hydrophobic chemicals .
The modifying chemical may also be an oxidative chemical, preferably hydrogen peroxide.
The extruder is preferably a conical extruder. The use of a conical extruder is beneficial since the defibrillation of the fibers and mixing with an eventual chemical is very good and efficient.
The solid content of the slurry comprising the fibers being treated in the extruder may be above 30wt%, preferably above 50wt%. Due to the flow dynamics in the extruder, above all in a conical extruder, it is possible to increase the dry content of the slurry comprising the fibers to be treated. The fibers of the slurry may be pre-treated before being conducted to the extruder. It is preferred that the fibers are pre-treated with an enzyme before being conducted and further treated in the extruder.
The invention further relates to microfibrillated
cellulose produced according to the process described above.
Detailed description of the invention
It has been shown that production of MFC may be done in a extruder. It is thus possible to disintegrate the fibers into microfibrillated cellulose of different length in an easy and efficient way. The extruder can be of any kind, for example a single screw, twin screw or conical extruder. It is preferred to use a conical extruder since it has been shown that the high shear forces in a conical extruder results in the production of microfibrillated cellulose in a very energy efficient way. The conical extruder also makes it possible to control the length of the produced microfibrillated cellulose in a good way.
Conical extruders are traditionally used for application of single or multilayer polymer layers on a co-axial products, profiles and multi-layered films. It can also be used for mixing materials together, such as wood plastics and natural fiber compounds with polymers but not typically targeting actual process of dispersive compounding. The typical design of the conical extruder is that its rotor (screw) is in the form of a cone. The temperature during the treatment is increased and the optimal temperature depends both on the material used and on the time needed for the fibers to pass the extruder.
Because of unique flow dynamics in the extruder,
especially the conical extruder, the dry solid content of the fibers fed into the extruder can be very high, typically above 30wt% and even preferably above 50wt%. The produced MFC will thus have increased dry content. This often is beneficial in later usage of the microfibrillated cellulose. If it is
necessary to transport the produced MFC it is advantageous to have a high dry content in order to avoid transporting large amounts of water. Also, if the produced MFC is added to surface of for example a paper or board web it is preferred to have high dry content in order to reduce the drying demands of the paper or board.
The fibers are preferably modified. The modification is preferably done by addition of a modifying chemical. Cellulosic fibers can be modified in many different ways in order to alter the properties of the fibers, i.e. to functionalize the fibers. The fibers can for example be carboxylized, oxidized or be made cationic. Surface modification can either be made by a direct surface reaction resulting in a modification or by indirect modification through adsorption of one or several polymers.
In prior art, surface modification techniques such as surface deposition using e.g. corona, flame, atomic layer deposition, plasma treatment or similar treatments are done in a separate process step. The use of a separate modification step increases the production time and the cost for the
production of modified fibers. By addition of a modifying chemical to the extruder according to the invention it is possible to modify the fibers at the same time as defibrillation, i.e. in an already existing process step. The modification can thus be done much faster and in a more energy efficient way. Another advantage by using an extruder when modifying the fibers is that it is possible to modify both the inner and outer regions of the fibers in the extruder at the same time as the fibers are defibrillated and MFC is produced. A normal chemical modification step of microfibrillated cellulose may have the disadvantage of producing varying quality grade fibers partly because of preferred adsorption of chemical to the outer fiber surfaces. By this invention, it is possible to both modify the fibers and produce MFC in a single process step. Especially beneficial is the short residence time under intensive mixing combined with residence time distribution control to avoid unnecessary hornification of the fibers.
The modification is done by addition of the appropriate chemical to the extruder. The fibers which are treated in the extruder are softened and expanded during the treatment and the addition of a chemical will result in a reaction between the fiber and the chemical. The reaction will result in that the fiber is modified, either by modifying the surface of the fibers and/or the chemical may be incorporated into the softened and expanded fiber.
All different kinds of known modifying chemicals may be used, such as carboxymethyl cellulose (CMC) , methyl cellulose, polyvinyl alcohol, calcium stearate, alcohols, different specific and non-specific salts, starch, surfactants and/or AKD or other hydrophobic chemicals. Both direct surface
modification chemical agents might be used and or process chemical aids such as tensides or alcohol or electrolytes (salts) . Some of the chemicals like CMC might also have dual effects such as surface modification and lubrication effect. It is also possible to oxidize the produced fibers by addition of an oxidative chemical, for example by addition of hydrogen peroxide, sodium hypochlorite, calcium hypochlorite, ammonium persulfate. It is also possible to use acids in order to modify the fibers, for example hydrochloric acid or sulphuric acid. The mentioned chemicals may either be added alone or in combination with one or more chemicals.
If starch is used as an additive or if the fibers comprise starch, the starch may be pre-cooked or uncooked. If the fibers comprises starch, either naturally, e.g. potato fibers or by addition the present starch may be cooked during the treatment in the extruder. In these cases it is thus preferred to add uncooked starch.
Similar type of modifications, as to chemical substitution of starch, such as esterfication, etherification,
cationization, carboxymethylation etc. can be done in an extruder. Also chemical breaching of cellulose can be done.
If the fibers are cationized it is possible to use the produced modified MFC both as a strength enhancement and as a retention chemical. A cationized MFC might also be of advantage when used in the size press. Here its cationic nature might have positive effect on the interaction with certain inks, such as anionic dye or pigment based inkjet inks.
If the fibers are hydrofobized, for example with akd, modified MFC can be used for hydrofobization of papers and board or composites. Other additives may also be used. These additives fed to the extruder may have affinity against cellulose and have ability to reduce internal friction of the fibers by means of organizing itself efficiently on cellulose surfaces enabling plasticization and elongations flow of the fibers under shear.
Another big advantage with the present invention is that it is possible to produce a composite in one process step. It is possible to add a waste material and fibers to the extruder and thereafter treat the mixture in the extruder producing a composite comprising of waste material and microfibrillated cellulose. The waste material may be filler, clay, polymer, sawdust and/or recycled fiber based package, such as liquid package waste comprising polymer and/or aluminum.
The fibers which are added to the extruder may be pre- treated, for example by refining or addition of chemicals or enzymes . It is preferred that the fibers are enzymatic pre-treated before being fed to the extruder. It is also possible to add enzymes during the treatment in the extruder. However, the temperature must then be kept low and it is also necessary to increase the time in the extruder so that the enzymes can decompose the fibers in the desired way.
It is also possible to further treat the produced
microfibrillated cellulose after the extruder in order to produce an even finer material, such as small nanocellulose . It is much easier and less energy demanding to treat the fibers, for example mechanically, after they have passed the extruder and being both defibrillated and optionally also modified. The fibers are preferable cellulosic fibers. Both hardwood and/or softwood cellulosic fibers may be treated. Other raw materials such as cotton, agricultural or fibers from cereals can also be used. However, the fibers may also be other type of fibers such as agricultural fibers for example potato fibers.
The microfibrillated cellulose produced according to the process results in more curled microfibrillated cellulose. The fibers, and above all the larger microfibrillated cellulose fibers tend to curl which depending on the end use may be beneficial .
In view of the above detailed description of the present invention, other modifications and variations will become apparent to those skilled in the art. However, it should be apparent that such other modifications and variations may be effected without departing from the spirit and scope of the invention .

Claims

Claims
1. A process for the production of microfibrillated cellulose, which process comprises the steps of:
providing a slurry comprising fibers,
adding the slurry to an extruder and
treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed .
2. The process according to claim 1 wherein at least one modifying chemical is added to the extruder during treatment of the slurry, so that modified microfibrillated cellulose is formed.
3. The process according to any of the preceding claims wherein the modifying chemical will modify the surface of the microfibrillated cellulose and/or the modifying chemical will be incorporated into the treated fibers.
4. The process according to any of the preceding claims wherein the modifying chemical is any of carboxymethyl cellulose (CMC) , methyl cellulose, polyvinyl alcohol, calcium stearate, alcohols, different specific and nonspecific salts, starch, surfactants, tensides and/or AKD or other hydrophobic chemicals.
5. The process according to any of the preceding claims wherein the modifying chemical is an oxidative chemical, preferably hydrogen peroxide.
6. The process according to any of the preceding claims wherein the extruder is a conical extruder.
7. The process according to any of the preceding claims wherein the solid content of the slurry comprising the fibers being treated in the extruder is above 30wt%, preferably above 50wt%.
8. The process according to any of the preceding claims wherein the fibers of the slurry is pre-treated before being conducted to the conical extruder.
9. The process according to claim 8 wherein the pre- treatment is an enzymatic treatment.
10. Microfibrillated cellulose produced according to the process of claims 1-9.
PCT/IB2010/054839 2009-10-26 2010-10-26 Process for production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process WO2011051882A1 (en)

Priority Applications (3)

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US13/503,871 US8747612B2 (en) 2009-10-26 2010-10-26 Process for the production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process
EP10826211.4A EP2494107B1 (en) 2009-10-26 2010-10-26 Process for production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process
BR112012009802A BR112012009802A2 (en) 2009-10-26 2010-10-26 process for the production of microfibrillated cellulose and microfibrillated cellulose produced in accordance with

Applications Claiming Priority (2)

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US25488709P 2009-10-26 2009-10-26
US61/254,887 2009-10-26

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WO (1) WO2011051882A1 (en)

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EP2660388A1 (en) 2012-05-03 2013-11-06 Saica Pack, S.L. Procedure for obtaining nanofibrillated cellulose from recovered paper
CN103534408A (en) * 2011-05-13 2014-01-22 斯托拉恩索公司 Process for treating microfibrillated cellulose and microfibrillated cellulose treated according to the process
WO2014202354A1 (en) * 2013-06-20 2014-12-24 Basf Se Process for the production of a microfibrillated cellulose composition
US9157189B2 (en) 2011-09-12 2015-10-13 Stora Enso Oyj Method of controlling retention and an intermediate product used in the method
WO2015157168A1 (en) * 2014-04-11 2015-10-15 Georgia-Pacific Consumer Products Lp Fibers with filler
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US9359724B2 (en) 2011-11-14 2016-06-07 Kemira Oyj AKD composition and manufacture of paper and paperboard
US9399838B2 (en) 2011-01-20 2016-07-26 Upm-Kymmene Corporation Method for improving strength and retention, and paper product
US9777143B2 (en) 2014-04-11 2017-10-03 Georgia-Pacific Consumer Products Lp Polyvinyl alcohol fibers and films with mineral fillers and small cellulose particles
WO2018046497A1 (en) * 2016-09-06 2018-03-15 Papiertechnische Stiftung Compound containing dry matter
US10087477B2 (en) 2013-12-18 2018-10-02 Teknologian Tutkimuskeskus Vtt Oy Process for producing fibrillated cellulose material
US20190085233A1 (en) * 2016-03-04 2019-03-21 Halliburton Energy Services, Inc. Improved hydration performance of microcellulose in cement
US10329359B2 (en) * 2014-10-29 2019-06-25 Kemira Oyj Method for producing microfibrillated cellulose and microfibrillated cellulose
US10689564B2 (en) 2015-11-23 2020-06-23 Schlumberger Technology Corporation Fluids containing cellulose fibers and cellulose nanoparticles for oilfield applications
US10731298B2 (en) 2012-06-15 2020-08-04 University Of Maine System Board Of Trustees Release paper and method of manufacture
US10815414B2 (en) 2015-05-20 2020-10-27 Schlumberger Technology Corporation Water control agent for oilfield application
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US8747612B2 (en) 2014-06-10
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