EP2291408A1 - Process for forming a pigment product from a cellulose derivative - Google Patents

Process for forming a pigment product from a cellulose derivative

Info

Publication number
EP2291408A1
EP2291408A1 EP09754025A EP09754025A EP2291408A1 EP 2291408 A1 EP2291408 A1 EP 2291408A1 EP 09754025 A EP09754025 A EP 09754025A EP 09754025 A EP09754025 A EP 09754025A EP 2291408 A1 EP2291408 A1 EP 2291408A1
Authority
EP
European Patent Office
Prior art keywords
process according
pigment product
cellulose derivative
cellulose
product
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09754025A
Other languages
German (de)
French (fr)
Other versions
EP2291408A4 (en
Inventor
Sami Turunen
Nina PYKÄLÄINEN
Tarja Sinkko
Kaisa Putkisto
Hannu Mikkonen
Soili Peltonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UPM Kymmene Oy
Original Assignee
UPM Kymmene Oy
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 UPM Kymmene Oy filed Critical UPM Kymmene Oy
Publication of EP2291408A1 publication Critical patent/EP2291408A1/en
Publication of EP2291408A4 publication Critical patent/EP2291408A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/005—Crosslinking of cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
    • C08G18/6484—Polysaccharides and derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B61/00—Dyes of natural origin prepared from natural sources, e.g. vegetable sources
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
    • C09B67/006—Preparation of organic pigments
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/26—Cellulose ethers
    • C08J2301/28—Alkyl ethers
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments

Definitions

  • Known from the prior art is the formation of organic pigments from starch-based materials and pure cellulose. In these cases, the pigment is usually present in a mixture with some other material or in a dispersion.
  • Also known from the prior art is the production of organic pigments from oil-based materials. As mineral fillers and coating pigments are replaced by materials of organic origin either partly or completely, the environmental load can be reduced.
  • fillers or pigments of organic origin e.g. in papermaking, the recycling of paper is enhanced and the deinking sludge is easier to process further or dispose of. This allows the application of used paper e.g. in the production of biofuels.
  • the strength of paper can be improved by organic fillers, and smoothness of the paper surface during calendering can be improved by organic pigments .
  • the objective of the invention is to disclose a novel process for producing a pigment product from a cellulose derivative. Another objective of the invention is to provide an industrially applicable process for industrial production of a cellulose-based pigment product .
  • the invention is based on a process for pro- ducing an organic pigment product from a cellulose derivative.
  • a selected cellulose derivative containing at least one OH group is crosslinked by a hydroxyl-active crosslinker to form a substantially insoluble pigment product.
  • the pigment product may be in the form of particles, a particle cluster, a dispersion or a foam.
  • the provided pigment product is pulverized to microparticles .
  • microparticles refer to micro- or nanoscale particles in the size class of preferably less than 50 ⁇ m, more preferably less than 10 ⁇ m.
  • the particles may be of any shape, e.g. spherical.
  • the microparticles are formed substantially in connection with the production of the pigment product. In one embodiment, the microparticles are formed substantially after the production of the pigment product.
  • pulverization refers to any pulverization, grinding, crushing or disintegration of a material to a desired particle size.
  • Operation of the pulverizing devices, preferably mills, is typically based on application of pressure, cutting, rubbing, compression and/or the effect of an impact provided by blowing, or an equivalent principle of operation. Most mills operate as a combination of many principles of operation.
  • the crosslinker is selected from the group of divinyl sul- phones, dianhydrides, dialdehydes, formaldehydes, gly- oxal, diisocyanates, ethylene glycol, diglycidyl ether, oxalic and citric acids and inorganic salts, e.g. aluminum sulphate.
  • the solubility of the cellulose derivative may be adjusted by crosslinkers .
  • the crosslinkers are preferably selected so as to obtain a substantially insoluble pigment product, preferably insoluble in water, with a cellulose derivative.
  • the crosslinker is used in an amount of 4 to 15% by weight of the amount of cellulose derivative.
  • the crosslinking reaction is activated by at least one activator selected from the group of heat, pH, catalyst, drying and radiation.
  • the catalyst is an aluminum sulphate catalyst.
  • metal catalysts such as inorganic salts of aluminum, magnesium and zinc, as the catalyst.
  • acid catalysts as the catalyst, in particular for dialdehyde and glyoxal crosslinkers.
  • ⁇ lulose derivative is dissolved prior to crosslinking in a selected solvent, in one preferred embodiment in water. Any suitable solvent may be used as the solvent.
  • the combination of the cellulose derivative and the solvent is in the form of a solution, sludge, suspension or dispersion. In one embodiment, the solid content in the solution of the cellulose derivative or the like is less than 10% by weight.
  • a surface-active agent is added to the cellulose derivative prior to crosslinking.
  • the surface-active agent may be selected from the group of dispersing agents, non- ionic and anionic tensides .
  • other suitable additive required by the use is added to the cellulose derivative.
  • a preferably light-scattering porous foam structure of the pigment product is formed by foaming, e.g. heavy stirring.
  • the resultant foam structure is stabilized, e.g. by crossbinding.
  • the crosslinker is added in the step of foaming the cellulose derivative.
  • the crosslinker is added in the step of stabilizing the structure.
  • the crosslinker is added to the cellulose derivative prior to foaming.
  • the cellulose derivative is heated to provide the foam.
  • the foaming may be provided chemi- cally and/or mechanically.
  • the pulveriza- tion is performed after drying.
  • the resultant pigment product is cured by heat.
  • the invention is also based on the pigment product formed in a manner described above and on the use thereof.
  • the provided pigment product may be used in the surface treatment, such as coating and covering, of a substrate, e.g. paper, and/or as a filler in a substrate, such as paper.
  • the pigment product and process for the pro- duction thereof according to the invention are applicable in the paper industry, e.g. in fine papers, newsprints, printing papers and soft tissues, in the cosmetics industry, e.g. in toothpastes, in the paint industry, hygiene product industry, plastics industry, coating industry, composite product industry, sheeting industry or in an equivalent application.
  • paper refers to any fiber- based paper or fiber product or the like.
  • the paper may have been made from chemical pulp, mechanical pulp, chemimechanical pulp, recycled pulp, and/or mixtures thereof or the like.
  • the paper may contain suitable fillers and additives and different kinds of surface treatment and coating agents.
  • the paper may be in the form of a web or a sheet, or in other form suit- able for the purpose.
  • the pigment product formed according to the invention may be used either alone or in a mixture with other agents in different kinds or pigments, pigment precursors, mixtures, compounds or the like.
  • the pigment product or particles thereof formed according to the invention may be modified e.g. by crosslinking and functionalizing in the manner required by the use.
  • the product is provided with different functional properties. Properties of the product may be tailored in terms of e.g. opacity, lightness, printing properties and oil absorption.
  • the product may also be utilized as an additive or auxiliary agent in different uses.
  • the invention provides an excellent industrially applicable way of producing an organic pigment product .
  • the pigment product according to the invention is applicable in novel paper applications in which low specific gravity of the raw materials provides the end product, such as paper, with new functional properties and improves cost-efficiency in the product supply chain from the producer to the customer.
  • the hydroxy propyl celluloses were crosslinked in an aqueous solution with glyoxal . Samples were prepared in portions of 10 to 5Og. The aqueous solution was prepared by first mixing 5Og of HPC powder mixture in hot water of a temperature of about 50 to 60 0 C, with the solid content of 8% by weight.
  • the homogenized dispersion was diluted in cold water (about 5 to 10 0 C, pH 4 to 5) under constant stirring so that the final solid content of the resultant aque- ous solution was 5% by weight.
  • Glyoxal solution (40% by weight in water)
  • a few drops of a surface-active agent (TISKO, Farmos) and an aluminum sulphate catalyst were added to the solution at room temperature under heavy stirring in a blade type mixer so as to ensure sufficient access of air to the resultant product.
  • Glyoxal was added in an amount of 10% by weight of the amount of HPC and the catalyst was added in an amount of 5% by weight of the amount of HPC.
  • the resultant product was in a foam form.
  • the resultant foam product was dried at 90°C in an oven so as to remove water and obtain a foam structure which was insoluble in water.
  • the short dwell time of the product in contact with the aqueous phase which was removed reduced film formation and softening in the structure of the foam product, improving the quality properties of the product.
  • Highly substituted high molecular weight hydroxy propyl cellulose is a non-ionic derivative which is soluble in cold water and forms a gelatinous medium at an elevated temperature of the solution and is resoluble during cooling.
  • a reaction with a hydroxyl- active glyoxal crosslinker produces a stable foam structure which is insoluble in water.
  • Dried HPC-glyoxal foam structures were pul- verized to microparticles in an air jet pulverizer with a classifier speed of lOOOOrpm. Particle sizes of the microparticles were in the range of 2 to lOO ⁇ m, and on average 8 to 25 ⁇ m.
  • the hydroxy propyl cellulose was crosslinked in aqueous solutions with methyl diphenyl diisocyanate (MDI) with different concentrations of the crosslin- ker.
  • Samples were prepared in portions of 5 to 1Og.
  • the aqueous solution was prepared by first mixing 50/1Og of HPC powder in hot water at a temperature of about 50 to 60 0 C, with a solid content of 8% by weight.
  • the homogenized dispersion was diluted in cold water (about 5 to 10 0 C, pH 7) under constant stirring so that the final solid content of the resultant aqueous solution was 6% by weight.
  • the MDI solution (about 30% by weight in ethanol) in an amount of either 50, 30 or 10% by weight of the amount of HPC and a few drops of a surface-active agent (TISKO, Farmos) were added to the solution at room temperature under heavy stirring in a blade type mixer so as to ensure sufficient access of air to the resultant product.
  • the resultant product was in a foam form.
  • the resultant foam products were dried at 90 2 C in an oven so as to remove water and obtain a foam structure which was insoluble in water.
  • Reaction of the MDI in the presence of moisture produced active bubble formation in connection with drying which was preserved as fine-divided porosity in the dried foam structure.
  • the dried foam structures were opaquely white, rigidly fragile and porous, which improved the quality properties of the product.
  • a reaction of HPC with a hy- droxyl-active diisocyanate crosslinker produces a sta- ble foam structure which is insoluble in water and which could be ground to particles.
  • the refractive index of the particles in the HPC-MDI foam structure was estimated to be in the range of 1.50 to 1.55, be- ing thus higher than that of the equivalent untreated HPC (1.45 to 1.50) .
  • the process according to the invention is applicable in different embodiments for use in producing the most different kinds of pigment products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Paper (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

The invention relates to a process for producing a pigment product from a cellulose derivative. According to the invention, a selected cellulose derivative containing at least one OH group is crosslinked by using a hydroxyl-active crosslinker to form a substantially insoluble pigment product. Further, the invention relates to the corresponding product and to the use of the product.

Description

PROCESS FOR FORMING A PIGMENT PRODUCT FROM A CELLULOSE DERIVATIVE
FIELD OF THE INVENTION The invention relates to the process for forming a pigment product from a cellulose derivative as defined in the preamble of claim 1, to the pigment product as defined in the preamble of claim 14 and to the use of a pigment product as defined in the pream- ble of claim 15.
BACKGROUND OF THE INVENTION
Known from the prior art are different kinds of cellulose derivatives and processes for their pro- duction.
Also known from the prior art are different kinds of pigments and fillers of mineral and organic origin and processes for their production. Known from the prior art is the formation of organic pigments from starch-based materials and pure cellulose. In these cases, the pigment is usually present in a mixture with some other material or in a dispersion. Also known from the prior art is the production of organic pigments from oil-based materials. As mineral fillers and coating pigments are replaced by materials of organic origin either partly or completely, the environmental load can be reduced. By using fillers or pigments of organic origin e.g. in papermaking, the recycling of paper is enhanced and the deinking sludge is easier to process further or dispose of. This allows the application of used paper e.g. in the production of biofuels. Also, in the typi¬ cal cases, the strength of paper can be improved by organic fillers, and smoothness of the paper surface during calendering can be improved by organic pigments .
A problem with oil-based organic pigments is their price which follows the development of the oil price, and high production costs.
A problem with the known starch-based organic pigments and those formed from pure cellulose is often the complexity of their preparation due to many production steps and therefore the scarcity of industrial production.
OBJECTIVE OF THE INVENTION
The objective of the invention is to disclose a novel process for producing a pigment product from a cellulose derivative. Another objective of the invention is to provide an industrially applicable process for industrial production of a cellulose-based pigment product .
SUMMARY OF THE INVENTION
The process and the pigment product according to the invention are characterized by what has been presented in the claims.
The invention is based on a process for pro- ducing an organic pigment product from a cellulose derivative. According to the invention, a selected cellulose derivative containing at least one OH group is crosslinked by a hydroxyl-active crosslinker to form a substantially insoluble pigment product. The pigment product may be in the form of particles, a particle cluster, a dispersion or a foam.
The invention is specifically based on reprocessing cellulose and a derivative thereof to a higher degree of processing. In this context, a pigment product refers to a material or agent providing a substrate or a surface with color or other optical property. The pigment may be translucent or opaque.
In one embodiment of the invention, the provided pigment product is pulverized to microparticles . In this context, microparticles refer to micro- or nanoscale particles in the size class of preferably less than 50μm, more preferably less than 10μm. The particles may be of any shape, e.g. spherical.
In one embodiment, the microparticles are formed substantially in connection with the production of the pigment product. In one embodiment, the microparticles are formed substantially after the production of the pigment product.
In this context, pulverization refers to any pulverization, grinding, crushing or disintegration of a material to a desired particle size. Operation of the pulverizing devices, preferably mills, is typically based on application of pressure, cutting, rubbing, compression and/or the effect of an impact provided by blowing, or an equivalent principle of operation. Most mills operate as a combination of many principles of operation.
Pulverization may be performed by any suitable process known per se. In one embodiment, the pig- ment product is pulverized by air jet pulverization, preferably an air jet mill. In one embodiment, the pulverization is performed as Cryo-pulverization. The pulverization may be performed as wet or dry pulverization. In one embodiment of the invention, the cellulose derivative is cellulose ether. In one embodiment, the cellulose derivative is hydroxy propyl cellulose (HPC) . In one embodiment, the cellulose derivative is selected from the group of hydroxy ethyl cellulose and carboxy methyl cellulose. In a preferred embodiment, the cellulose derivative is selected so as to be solu- ble in water. In one embodiment, the cellulose derivative has substantially high molecular weight. The cellulose derivative may be a mixture of a number of cellulose compounds. The cellulose derivative may contain small amounts of compounds which are not cellulose- based.
In one embodiment of the invention, the crosslinker is selected from the group of divinyl sul- phones, dianhydrides, dialdehydes, formaldehydes, gly- oxal, diisocyanates, ethylene glycol, diglycidyl ether, oxalic and citric acids and inorganic salts, e.g. aluminum sulphate. The solubility of the cellulose derivative may be adjusted by crosslinkers . The crosslinkers are preferably selected so as to obtain a substantially insoluble pigment product, preferably insoluble in water, with a cellulose derivative.
In one embodiment of the invention, the crosslinker is used in an amount of 4 to 15% by weight of the amount of cellulose derivative. In one embodiment of the invention, the crosslinking reaction is activated by at least one activator selected from the group of heat, pH, catalyst, drying and radiation. In one embodiment, the catalyst is an aluminum sulphate catalyst. In one embodiment, it is possible to use metal catalysts, such as inorganic salts of aluminum, magnesium and zinc, as the catalyst. In an alternative embodiment, it is possible to use acid catalysts as the catalyst, in particular for dialdehyde and glyoxal crosslinkers. In one embodiment of the invention, the cel-
■ lulose derivative is dissolved prior to crosslinking in a selected solvent, in one preferred embodiment in water. Any suitable solvent may be used as the solvent. The combination of the cellulose derivative and the solvent is in the form of a solution, sludge, suspension or dispersion. In one embodiment, the solid content in the solution of the cellulose derivative or the like is less than 10% by weight.
In one embodiment, the crosslinker may be in liquid form and dissolved in a suitable solvent, e.g. water or ethanol.
In one embodiment of the invention, a surface-active agent is added to the cellulose derivative prior to crosslinking. The surface-active agent may be selected from the group of dispersing agents, non- ionic and anionic tensides . In one embodiment, other suitable additive required by the use is added to the cellulose derivative.
In one embodiment of the invention, a preferably light-scattering porous foam structure of the pigment product is formed by foaming, e.g. heavy stirring. In a preferred embodiment, the resultant foam structure is stabilized, e.g. by crossbinding. In one embodiment, the crosslinker is added in the step of foaming the cellulose derivative. In one embodiment, the crosslinker is added in the step of stabilizing the structure. In one embodiment, the crosslinker is added to the cellulose derivative prior to foaming. In one embodiment, the cellulose derivative is heated to provide the foam. The foaming may be provided chemi- cally and/or mechanically.
In one embodiment of the invention, the resultant pigment product is dried. In one embodiment, drying is performed at a temperature of 70 to 1000C, more preferably at a temperature of about 80 to 9O0C. Crosslinking may be completed during drying. During drying of the pigment product, if not earlier, the crosslinking generates between the polymer chains bonds which are insoluble in water.
In one preferred embodiment, the pulveriza- tion is performed after drying. In one embodiment of the invention, the resultant pigment product is cured by heat.
The invention is also based on the pigment product formed in a manner described above and on the use thereof. The provided pigment product may be used in the surface treatment, such as coating and covering, of a substrate, e.g. paper, and/or as a filler in a substrate, such as paper.
The pigment product and process for the pro- duction thereof according to the invention are applicable in the paper industry, e.g. in fine papers, newsprints, printing papers and soft tissues, in the cosmetics industry, e.g. in toothpastes, in the paint industry, hygiene product industry, plastics industry, coating industry, composite product industry, sheeting industry or in an equivalent application.
In this context, paper refers to any fiber- based paper or fiber product or the like. The paper may have been made from chemical pulp, mechanical pulp, chemimechanical pulp, recycled pulp, and/or mixtures thereof or the like. The paper may contain suitable fillers and additives and different kinds of surface treatment and coating agents. The paper may be in the form of a web or a sheet, or in other form suit- able for the purpose.
The pigment product formed according to the invention may be used either alone or in a mixture with other agents in different kinds or pigments, pigment precursors, mixtures, compounds or the like. The pigment product or particles thereof formed according to the invention may be modified e.g. by crosslinking and functionalizing in the manner required by the use. The product is provided with different functional properties. Properties of the product may be tailored in terms of e.g. opacity, lightness, printing properties and oil absorption. The product may also be utilized as an additive or auxiliary agent in different uses.
The invention provides an excellent industrially applicable way of producing an organic pigment product .
The process according to the invention provides a porous pigment product with lower specific gravity than in the previously known mineral-based pigments . Another advantage of the pigment product according to the invention is recyclability. This permits the reduction of waste problems.
The pigment product according to the invention is applicable in novel paper applications in which low specific gravity of the raw materials provides the end product, such as paper, with new functional properties and improves cost-efficiency in the product supply chain from the producer to the customer.
DETAILED DESCRIPTION OF THE INVENTION
The invention is described in more detail by the following example.
Example 1
In this example, crosslinking a commercial hydroxy propyl cellulose (HPC) and production of the pigment product according to the invention were stud- ied.
Two types of commercial hydroxy propyl cellulose were used in the tests in a 50/50 mixture; a) Klucel H (Mw = 1150000, solution = 1% in water, viscosity = 1275 to 3500mPas) and b) Klucel M (Mw = 850000, solution = 2% in water, viscosity = 3500 to 7500mPas) . The hydroxy propyl celluloses were crosslinked in an aqueous solution with glyoxal . Samples were prepared in portions of 10 to 5Og. The aqueous solution was prepared by first mixing 5Og of HPC powder mixture in hot water of a temperature of about 50 to 600C, with the solid content of 8% by weight. The homogenized dispersion was diluted in cold water (about 5 to 100C, pH 4 to 5) under constant stirring so that the final solid content of the resultant aque- ous solution was 5% by weight. Glyoxal solution (40% by weight in water) , a few drops of a surface-active agent (TISKO, Farmos) and an aluminum sulphate catalyst were added to the solution at room temperature under heavy stirring in a blade type mixer so as to ensure sufficient access of air to the resultant product. Glyoxal was added in an amount of 10% by weight of the amount of HPC and the catalyst was added in an amount of 5% by weight of the amount of HPC. The resultant product was in a foam form. The resultant foam product was dried at 90°C in an oven so as to remove water and obtain a foam structure which was insoluble in water. The short dwell time of the product in contact with the aqueous phase which was removed reduced film formation and softening in the structure of the foam product, improving the quality properties of the product.
Highly substituted high molecular weight hydroxy propyl cellulose is a non-ionic derivative which is soluble in cold water and forms a gelatinous medium at an elevated temperature of the solution and is resoluble during cooling. A reaction with a hydroxyl- active glyoxal crosslinker produces a stable foam structure which is insoluble in water.
Dried HPC-glyoxal foam structures were pul- verized to microparticles in an air jet pulverizer with a classifier speed of lOOOOrpm. Particle sizes of the microparticles were in the range of 2 to lOOμm, and on average 8 to 25μm.
It was discovered that with smaller amounts of cellulose derivative it was possible to use the crosslinker in an amount of 4 to 5% by weight of the amount of HPC. A relatively high solution viscosity of the cellulose derivative had a positive effect on foaming.
In the tests it was discovered that the re- sultant pigment product is applicable for use both as a pigment and as a filler.
Example 2
In this example, crosslinking a commercial hydroxy propyl cellulose (HPC) and production of the pigment product according to the invention were studied.
Commercial hydroxy propyl cellulose Klucel G (Mw = 370000, solution = 2% in water, viscosity = 125 to 450mPas) was used in the tests.
The hydroxy propyl cellulose was crosslinked in aqueous solutions with methyl diphenyl diisocyanate (MDI) with different concentrations of the crosslin- ker. Samples were prepared in portions of 5 to 1Og. The aqueous solution was prepared by first mixing 50/1Og of HPC powder in hot water at a temperature of about 50 to 600C, with a solid content of 8% by weight. The homogenized dispersion was diluted in cold water (about 5 to 100C, pH 7) under constant stirring so that the final solid content of the resultant aqueous solution was 6% by weight. The MDI solution (about 30% by weight in ethanol) in an amount of either 50, 30 or 10% by weight of the amount of HPC and a few drops of a surface-active agent (TISKO, Farmos) were added to the solution at room temperature under heavy stirring in a blade type mixer so as to ensure sufficient access of air to the resultant product. The resultant product was in a foam form.
The resultant foam products were dried at 902C in an oven so as to remove water and obtain a foam structure which was insoluble in water. Reaction of the MDI in the presence of moisture produced active bubble formation in connection with drying which was preserved as fine-divided porosity in the dried foam structure. In all applied concentrations of the MDI the dried foam structures were opaquely white, rigidly fragile and porous, which improved the quality properties of the product. A reaction of HPC with a hy- droxyl-active diisocyanate crosslinker produces a sta- ble foam structure which is insoluble in water and which could be ground to particles.
By liquid immersion process the refractive index of the particles in the HPC-MDI foam structure was estimated to be in the range of 1.50 to 1.55, be- ing thus higher than that of the equivalent untreated HPC (1.45 to 1.50) .
The process according to the invention is applicable in different embodiments for use in producing the most different kinds of pigment products.
The invention is not limited merely to the example referred to above; instead, many variations are possible within the scope of the inventive idea defined by the claims .

Claims

1. A process for producing a pigment product from a cellulose derivative, c h a r a c t e r i z e d in that a selected cellulose derivative containing at least one OH group is crosslinked by using a hydroxyl- active crosslinker to form a substantially insoluble pigment product .
2. The process according to claim 1, c h a r - a c t e r i z e d in that the provided pigment product is pulverized to microparticles .
3. The process according to claim 1 or 2, c h a r a c t e r i z e d in that the cellulose derivative is cellulose ether.
4. The process according to any one of claims
1 to 3, c h a r a c t e r i z e d in that the cellulose derivative is hydroxy propyl cellulose (HPC) .
5. The process according to any one of claims 1 to 4, c h a r a c t e r i z e d in that the cellulose derivative is selected from a group of hydroxy ethyl cellulose and carboxy methyl cellulose.
6. The process according to any one of claims 1 to 5, c h a r a c t e r i z e d in that the crosslinker is selected from a group of divinyl sulphones, di- anhydrides, dialdehydes, formaldehydes, glyoxal, diisocyanates, ethylene glycol, diglycidyl ether, oxalic and citric acids and inorganic salts.
7. The process according to any one of claims 1 to 6, c h a r a c t e r i z e d in that the amount of crosslinker is 4 to 15% by weight of the amount of cellulose derivative.
8. The process according to any one of claims 1 to 7, c h a r a c t e r i z e d in that the crosslink- ing reaction is activated by at least one activator selected from a group of heat, pH, catalyst, drying and radiation.
9. The process according to any one of claims 1 to 8, c h a r a c t e r i z e d in that the cellulose derivative is dissolved in a selected solvent prior to crosslinking.
10. The process according to any one of claims 1 to 9, c h a r a c t e r i z e d in that a surface-active agent is added to the cellulose derivative prior to crosslinking.
11. The process according to any one of claims 1 to 10, c h a r a c t e r i z e d in that a porous foam structure of the pigment product is formed.
12. The process according to any one of claims 1 to 11, c h a r a c t e r i z e d in that the provided pigment product is dried.
13. The process according to any one of claims 1 to 12, c h a r a c t e r i z e d in that the provided pigment product is cured by heat.
14. A cellulose-based pigment product, c h a r a c t e r i z e d in that it is formed by the process according to any one of claims 1 to 13.
15. Use of a pigment product formed by the process according to any one of claims 1 to 13, c h a r a c t e r i z e d in that the provided pigment product is used in surface-treatment of a substrate and/or in fillers.
EP09754025.6A 2008-05-30 2009-05-26 PROCESS FOR FORMING A PIGMENTARY PRODUCT FROM A CELLULOSE DERIVATIVE Withdrawn EP2291408A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20085526A FI123642B (en) 2008-05-30 2008-05-30 Process for forming a pigment product of a cellulose derivative, pigment product and its use
PCT/FI2009/050434 WO2009144372A1 (en) 2008-05-30 2009-05-26 Process for forming a pigment product from a cellulose derivative

Publications (2)

Publication Number Publication Date
EP2291408A1 true EP2291408A1 (en) 2011-03-09
EP2291408A4 EP2291408A4 (en) 2013-05-29

Family

ID=39523177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09754025.6A Withdrawn EP2291408A4 (en) 2008-05-30 2009-05-26 PROCESS FOR FORMING A PIGMENTARY PRODUCT FROM A CELLULOSE DERIVATIVE

Country Status (3)

Country Link
EP (1) EP2291408A4 (en)
FI (1) FI123642B (en)
WO (1) WO2009144372A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101734853B1 (en) 2010-06-08 2017-05-12 다우 글로벌 테크놀로지스 엘엘씨 Method for the preparation of a particulate reversibly crosslinked polymeric material
WO2012092813A1 (en) * 2011-01-07 2012-07-12 佛山市优特医疗科技有限公司 Wound dressing with high moisture absorption and capable of being removed as a whole
EP3055454A4 (en) 2013-10-11 2017-07-12 UPM-Kymmene Corporation Method for manufacturing a paper, a paper and its use, a furnish and a wood based composition
CN113116747A (en) * 2020-01-14 2021-07-16 罗盖特公司 Natural and porous starches as white pigments in toothpaste

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848327A (en) 1953-02-19 1958-08-19 Screen Engineering Co Glass fabric resin impregnated base coated with a light sensitive layer
US3489719A (en) 1967-07-05 1970-01-13 Dow Chemical Co Surface treatment of finely-divided water-soluble polymers
EP0909766A3 (en) 1997-10-15 1999-09-29 Borchers GmbH Urethane-modified non ionic celluloses, a process for their production and their use as thickening additive
JP2000015922A (en) 1998-06-30 2000-01-18 Daicel Chem Ind Ltd Ink image receiving sheet and method of manufacturing the same
DE10308109A1 (en) 2003-02-26 2004-09-09 Wolff Cellulosics Gmbh & Co. Kg Water-dispersible polysaccharide derivatives with reduced glyoxal content and a process for lowering the glyoxal content in glyoxal cross-linked polysaccharide derivatives
FI122073B (en) * 2003-10-02 2011-08-15 Teknologian Tutkimuskeskus Vtt Porous filler or coating pigments for paper and paperboard and their preparation

Also Published As

Publication number Publication date
WO2009144372A1 (en) 2009-12-03
FI123642B (en) 2013-08-30
EP2291408A4 (en) 2013-05-29
FI20085526A0 (en) 2008-05-30
FI20085526L (en) 2009-12-01

Similar Documents

Publication Publication Date Title
Österberg et al. Spherical lignin particles: a review on their sustainability and applications
Osong et al. Processing of wood-based microfibrillated cellulose and nanofibrillated cellulose, and applications relating to papermaking: a review
Aulin et al. Multilayered alkyd resin/nanocellulose coatings for use in renewable packaging solutions with a high level of moisture resistance
CN112004833B (en) Sulfonated pulp fiber and method for producing same, sulfonated microfine cellulose fiber and method for producing same
US9175442B2 (en) Process for manufacturing coated substrates
JP6713590B1 (en) Method for producing dry solid containing fine cellulose fibers
WO2011065371A1 (en) Filmy material, method for producing same, and aqueous dispersion for forming filmy material
Wu et al. Integrated and sustainable preparation of functional nanocellulose via formic acid/choline chloride solvents pretreatment
EP2740685A1 (en) Method for producing a coated packaging material and packaging material with at least one barrier layer for hydrophobic compositions
Wang et al. Ultraviolet light enhanced sodium persulfate oxidation of cellulose to facilitate the preparation of cellulose nanofibers
CN103320003A (en) Preparation method for nanometer cellulose composite waterborne polyurethane paint film on wood surface
Liu et al. Nanocellulose, a renewable biobased functional/reinforcement additive for composite coating materials: a review
Imani et al. Coupled effects of fibril width, residual and mechanically liberated lignin on the flow, viscoelasticity, and dewatering of cellulosic nanomaterials
EP2291408A1 (en) Process for forming a pigment product from a cellulose derivative
WO2019189776A1 (en) Paper containing carboxymethylated cellulose nanofibers
JP2020097733A (en) Dry solid containing fine cellulose fibers, fine cellulose fiber redispersion
JPWO2018012629A1 (en) Cellulose nanofiber containing cellulose fiber and method for producing
JP5665487B2 (en) Membrane and method for producing the same
US20220010492A1 (en) Surface treatment composition
JP2001131891A (en) Water resistant paper, method for producing the same, and paper container
JP7232072B2 (en) MODIFIED CELLULOSE NANOFIBER, GAS BARRIER MATERIAL AND GAS BARRIER MOLDED PRODUCT
CN114846204A (en) Dispersion of cellulose fibers and method for producing the same
WO2020129855A1 (en) Production method for dry solid containing fine cellulose fibers, dry solid containing fine cellulose fibers, redispersion of fine cellulose fibers
Antony et al. Sizing of paper with sucrose octaacetate using liquid and supercritical carbon dioxide as a green alternative medium
JP2012097236A (en) Aqueous dispersion for formation of gas-barrier filmy material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20101229

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA RS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UPM-KYMMENE CORPORATION

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20130425

RIC1 Information provided on ipc code assigned before grant

Ipc: C08B 11/20 20060101ALI20130419BHEP

Ipc: C08K 5/00 20060101ALI20130419BHEP

Ipc: C08G 18/76 20060101ALI20130419BHEP

Ipc: D21H 19/42 20060101ALI20130419BHEP

Ipc: C08J 3/28 20060101ALI20130419BHEP

Ipc: C08J 3/24 20060101ALI20130419BHEP

Ipc: C08J 3/12 20060101ALI20130419BHEP

Ipc: C08J 9/00 20060101ALI20130419BHEP

Ipc: D21H 17/25 20060101ALI20130419BHEP

Ipc: D21H 19/52 20060101ALI20130419BHEP

Ipc: C08B 15/00 20060101AFI20130419BHEP

Ipc: D21H 17/67 20060101ALI20130419BHEP

Ipc: C09B 67/20 20060101ALI20130419BHEP

Ipc: C09B 61/00 20060101ALI20130419BHEP

Ipc: C08G 18/64 20060101ALI20130419BHEP

17Q First examination report despatched

Effective date: 20140210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20161201