EP3430199A1 - Procédé de fabrication de papier imprégné par un fluide à pression supercritique - papier imprégné, notamment coloré - Google Patents
Procédé de fabrication de papier imprégné par un fluide à pression supercritique - papier imprégné, notamment coloréInfo
- Publication number
- EP3430199A1 EP3430199A1 EP17716947.1A EP17716947A EP3430199A1 EP 3430199 A1 EP3430199 A1 EP 3430199A1 EP 17716947 A EP17716947 A EP 17716947A EP 3430199 A1 EP3430199 A1 EP 3430199A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- copolymers
- latex
- fibers
- dye
- 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.)
- Pending
Links
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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
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- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
-
- 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
- D21H19/10—Coatings without 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/22—Polyalkenes, e.g. polystyrene
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/42—Paper being at least partly surrounded by the material on both sides
- D21H23/44—Treatment with a gas or vapour
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
Definitions
- the invention relates to the field of papermaking and more particularly relates to a method of manufacturing a paper impregnated with a molecule of interest, in particular a colored paper and the associated product, that is to say a impregnated paper and in particular a colored paper whose color does not disintegrate in contact with water, in other words a paper whose molecules of interest, especially dyes, are stable in the paper in contact with the paper water.
- the means according to the invention and in particular the paper, in particular the colored paper produced can be implemented in many fields of application including packaging in general, papers intended for food contact (packaging paper, absorbent papers and especially napkins, tablecloths), papers used in the field of hygiene, wiping, papers intended for outdoor use such as advertising posters, envelopes, and also printing papers , including the fields of communication, advertising, publishing, arts and creative hobbies, secure papers such as banknotes, technical papers especially intended for scientific use such as membrane filters, papers intended for example medical tests, labels.
- the colored papers currently produced present problems of disgorging dyes when they are wet. This is particularly troublesome for applications in the fields of packaging, particularly in the field of luxury, but also in the field of food packaging, the field of absorbent papers, papers for hygiene or technical papers.
- the principle of papermaking has evolved very little since its invention. From an aqueous suspension of cellulosic fibers, a sheet is formed on a fabric by dripping: this fibrous mat is then pressed and dried to remove excess water.
- the manufacture of the colored paper then consists in adding to the fibrous suspension dyes themselves soluble or dispersed in water and having sufficient affinity with the fibers so that a large part remains in the fibrous mat during the dewatering . Fixatives are used most of the time to improve the bond between the fibers and the dyes.
- the colored papers are obtained by coloring the surface of the paper for example using the size-press. In the same way white papers can be treated with brighteners.
- Adding dyes to the dough is the most common method used to obtain colored papers.
- the dyes are generally added to the dough, either in the pulper or in the mixing vat.
- dyes such as basic dyes (anionic dyes), direct dyes, or acid dyes.
- fixing agents and other adjuvants are used to improve dye fixation and obtain better results. Despite this, a significant amount of dye is lost in the water circuits.
- these hydrophilic dyes tend to disgorge when the paper is wet.
- the colored paper manufacturing process further generates a portion of dyes simply trapped in the fibrous network. These dyes will disgorge more easily that they have not created chemical bonds with the fibers.
- the colorants are added to the "sauce" of the press. Surface coloration is therefore limited to certain special cases because it is difficult to obtain an even coloring of the paper. But this method has the advantage of eliminating the presence of dyes in the water circuits.
- a 1931 patent [12] describes calender staining with an acidic dye to which is added a compound of the group of guanidines in excess of the theoretical amount necessary for the precipitation of the dye and this in order to improve the character not disgorging paper.
- the document [13] also describes a post-coloring process: the paper roll is unwound in order to be dipped in a coloring bath; the surplus is removed and the paper is dried. The dye is then fixed by a size-press treatment. The paper is finally dried, calendered and rewound.
- Document [14] describes a dye composition containing both pigments ( ⁇ 200 nm) and a polymeric binder in the form of particles.
- This composition makes it possible to form a thin coloring layer on the surface of the support, having good properties in terms of color and strength. These techniques all have the advantage of being economic and ecological. On the other hand, they lead to obtaining a non-uniformly colored paper in the thickness of the sheet.
- the present invention proposes a solution to the problem of the observed bleeding of colored papers when they are brought into contact with water, which makes it possible to use commercially available dyes and uses an impregnation dyeing mode by means of dyeing. a fluid under supercritical pressure.
- the process according to the invention uses dyes which may be hydrophobic (so-called disperse dyes) which, insofar as they have no or low affinity with water, will not tend to migrate into the water at all. its contact if they are properly trapped within a hydrophobic polymeric network contained in the fibrous mat of the paper or on the surface of the paper.
- a first step of the method consists in manufacturing on a traditional paper machine a white sheet containing a polymeric additive in bulk and / or surface added in the form of latex, and preferably added in bulk during the manufacture of paper.
- This white sheet is then impregnated, in particular stained with hydrophobic dyes, by impregnation with fluid (in particular with CO 2 ) at supercritical pressure.
- the coloring of a paper medium by means of a supercritical fluid has been the subject of rare studies.
- the document [16] describes, inter alia, the impregnation of a paper with hydrophobic dyes via the use of a supercritical fluid.
- the substrate described in this document is any paper whose constituent elements, essentially cellulose fibers, have no particular affinity for the hydrophobic dye. This results in a low intensity coloration where the dye is precipitated without any fixation within the fibrous network.
- the patent application [17] proposes a process for staining the cellulose fibers in a supercritical CO 2 medium with a hydrophobic and uncharged dye comprising at least one step of bringing said fibers into contact with an effective amount of at least one mono primary organo-urea under conditions conducive to the establishment of covalent bonds of carbamate type between the cellulose and the molecules of said organourea.
- This method has several disadvantages. Firstly, the reaction between the mono-organo-urea and the cellulose involves a gassing of NH3 which generates a risk of overpressure in the reactor.
- the document [18] relates to the production of a colored paper by supercritical CO 2 impregnation following the manufacture of a white sheet containing amphiphilic molecules.
- the product described in this document does not offer a totally satisfactory solution to the disgorging problem insofar as the amphiphilic molecules themselves having a hydrophilic character will tend to be entrained during contact with water and take the coloring molecules, although hydrophobic, with them.
- such a paper containing a substantial proportion of surfactant will have a degraded mechanical strength and poor resistance to penetration of water.
- the original solution proposed according to the invention consists in impregnating, in particular in dyeing, a paper containing a polymeric additive introduced in latex form (hereinafter also referred to as "latex") introduced in bulk and / or applied on the surface. If it is known to use latex in the papermaking field, it is with the aim of modifying the properties specific to the paper produced and in particular its mechanical properties, on the one hand, and under conditions of contribution that stand out those proposed in the context of the invention, on the other hand.
- latex a polymeric additive introduced in latex form
- Latexes are thus most often used on the surface of the paper as binders of a pigmented layer, which is deposited by size-press or with the aid of a coater which makes it possible to improve various properties such as appearance ( brightness, whiteness, opacity), print rendering (contrast, definition of the image), reducing roughness and surface porosity or even providing the paper with specific properties such as barrier properties, insulating properties, etc. They can also be used to chemically consolidate nonwoven products.
- the latices are then introduced into the support by various techniques: impregnation (size-press or baths), spraying or coating according to the expected result.
- the consolidation action then develops in a dryer or a suitable oven.
- [19] and [20] both relate to a procedure for adding latex to the paper mass and its retention via cationic flocculation agents to improve the mechanical strength properties. of the product obtained.
- the document [21] relates to a fibrous substrate (containing at least 50% of cellulose) saturated with a latex in order to produce a paper that can be used in an environment that must remain free of contamination.
- the document [22] describes the addition of latex in the mass of a tracing paper to improve its mechanical properties of resistance to folding and traction, while the document [23] proposes the addition of a copolymer obtained by polymerizing one or more unsaturated monomers and a carbohydrate compound to improve the mechanical strength.
- a hydrophobic planar support comprising at least the following elements: a fibrous mattress based on cellulose fibers and glass fibers, a fluorinated resin conferring hydrophobic properties on the fibrous mat, a polymer-type binder latex form for bonding glass fibers to cellulose fibers.
- the colored paper or impregnated with a supercritical pressure fluid after a process implemented after the manufacture of paper and using an impregnation step by means of a supercritical pressure fluid when said paper has been made from a pulp incorporating, in its core, a polymer-based composition in the form of a latex, or when the manufactured paper has, on the surface, a layer of such a polymer, has a very high intensity of coloration and also a homogeneity of the coloration in the thickness when said polymer is introduced in bulk, equivalent mechanical properties or even improved compared to a conventional impregnated or colored paper, as well as a resistance to disgorging at remarkable water.
- the subject of the invention is therefore, according to a first aspect, a process for impregnating paper by means of a supercritical pressure fluid, in particular such a process for coloring paper and a method of manufacturing impregnated paper, especially colored paper.
- a supercritical pressure fluid in particular such a process for coloring paper and a method of manufacturing impregnated paper, especially colored paper.
- an impregnated paper in particular colored, uniformly throughout its thickness and / or its surface and whose color does not disintegrate in contact with water.
- the invention makes it possible to produce an impregnated paper, in particular colored paper, in a more ecological way (without releasing molecules, in particular dyes in the waters of the paper machine, wasting dye, incorporating easy recycling of the CO 2 used as a dyeing vector) but also economical by eliminating the color campaign operation in paper mills, thereby reducing the need for stockpiling and enabling on-demand production on minimum quantities well below what is possible to propose to date.
- the subject of the invention is therefore a process for impregnating a paper, in particular a coloring process, by means of a supercritical pressure fluid, characterized in that it comprises a step of impregnation by placing in contact with one another.
- a paper with molecules of interest in the presence of a fluid in the supercritical or subcritical state said paper comprising, (i) at heart, a polymeric additive introduced in latex form and / or, (ii) ) at the surface, a polymeric additive applied in latex form, identical to or different from the polymer of the latex possibly present in the core and / or a molecule, in particular a polymer, which can be impregnated with a molecule of interest, in particular a hydrophobic molecule by means of the supercritical pressure fluid.
- the paper intended to be brought into contact with the molecule of interest comprises, in the middle and / or on the surface, a polymeric additive introduced in latex form.
- the paper intended to be brought into contact with the molecule of interest comprises at heart a polymeric additive introduced in latex form.
- the coloring process is carried out on dry paper.
- the paper is in the form of a sheet, said sheet being able to take the form of a continuous strip or a coil.
- the additional surface treatments possibly applied to the sheet produced as well as the finishing operations were carried out prior to its impregnation, in particular prior to its coloring.
- the supercritical pressure fluid used in the staining process is carbon dioxide.
- said fluid is used in the supercritical state for the impregnation stage or alternatively in the subcritical state.
- the carbon dioxide is mixed with an organic solvent, for example an alcohol, in particular ethanol.
- an organic solvent for example an alcohol, in particular ethanol.
- the supercritical pressure fluid is CO 2 mixed with 1 to 20% by weight of ethanol.
- the fluid is chosen from ethylene, propylene, ethane, propane, butane, nitrous oxide, fluorocarbons or is a mixture of one of these fluids with a fluid.
- suitable organic solvent such as an alcohol, for example ethanol.
- supercritical pressure fluid or for convenience in the absence of reference to the specific conditions described below as “supercritical fluid” in the context of the invention, a compound chosen for its ability to solubilize the molecules of interest , in particular hydrophobic molecules and preferably dyes, when it is brought to a supercritical state or alternatively to the sub-critical state.
- supercritical state only the pressure is supercritical.
- temperature and pressure are supercritical.
- the temperature is greater than or equal to 70 ° C. or 100 ° C. It is preferably less than 200 ° C, for example less than or equal to 150 ° C, especially in a range of 70 ° C to 130 ° C.
- the pressure of the supercritical fluid is greater than or equal to 200 bars. This pressure is advantageously less than 1000 bar and in particular less than or equal to 400 bar.
- the supercritical CO 2 is obtained within the scope of the invention, at 100 ° C. and 300 bar.
- the carbon dioxide in the subcritical state is obtained at a temperature below 31 ° C and at a pressure above 74 bar. To do this the temperature can in particular be lower than 31 ° C and the pressure be greater than or equal to 200 bars.
- the pressure is advantageously less than 400 bar and advantageously of the order of 300 bar.
- the transition to the supercritical fluid state of CO 2 is described in the examples.
- the supercritical state is reached by gradually increasing the pressure in the reactor.
- the C02 can be prepared in the subcritical state or any other supercritical pressure fluid among the examples given, by applying similar conditions for a temperature and a pressure determined according to the fluid.
- the temperature and pressure conditions of the fluid in the supercritical state can also be adjusted by those skilled in the art, depending on the solubility of the molecules used in particular for the coloration and, if appropriate, as a function of their sensitivity to the operating conditions, for example at a high temperature.
- the method thus used makes it possible to obtain impregnated papers, in particular colored papers which show a stable impregnation and in particular do not disgorge in contact with water.
- the paper is treated with the supercritical pressure fluid to be colored, dye molecules or reactive disperse dyes are advantageously used.
- the coloring molecules are constituted by a dispersed hydrophobic dye or a mixture of dispersed hydrophobic dyes, the dye (s) being optionally pretreated to remove the dispersing agents, the dye (s) being brought (s) from 0.1% to 10%, for example from 1 to 10%, in particular from 1% to 5%, in particular from approximately 2.5% to 5% by dry weight of dye (s) relative to the weight of the paper or, if the dispersing agents are present, from 0.1 to 20%, in particular from 2 to 10% by dry weight of dye (s) relative to the weight of the paper.
- the dyes employed are advantageously commercially available dyes, such as those illustrated in the examples. These are hydrophobic dyes presented or prepared by the operator in the form of dispersible powder in water or liquid already dispersed in water and which is used as such or after treatment (for example by extraction with acetone) to remove dispersants.
- the formulation usually comprises 50% dispersants relative to the total weight of said dye formulation (s).
- the dyes of the disperse dye type can be used in the context of the dyeing process, these dyes being characterized by the absence of solubilization groups and a low molecular weight.
- These dyes may be simple azo compounds, anthraquinone compounds, methine-, nitro- and naphthoquinone-type dyes.
- the relative amount of dye supplied to the reactor for carrying out the dyeing process according to the invention varies according to the amount of paper to be treated and, if appropriate, the properties of the paper.
- the dye or the mixture of dyes is provided at a level of from 0.1% to 10%, for example from 2% to 10% by dry weight.
- dye (s) relative to the weight of the paper in particular 2.5 to 5% by dry weight of dye (s) relative to the weight of the paper or, if the dispersing agents are present, at a level of 0 , 1 to 20%, in particular from 2 to 10% by dry weight of dye (s) relative to the weight of the paper.
- hydrophobic molecules may further be added or substituted for the dyes for impregnating the paper by means of the impregnation process, such as optical brighteners, fluorophores, antioxidants, ultraviolet absorbing molecules, surfactants, polymers, especially polymers adapted to the transparency of paper, that is to say polymers soluble in CO 2 SC (having a low molecular weight) and whose refractive index is close to that of the cellulose (1.47) paraffin waxes and other molecules with special functional characteristics such as conductive or insulating electrical products, conductive products or thermal insulators.
- optical brighteners such as fluorophores, antioxidants, ultraviolet absorbing molecules, surfactants, polymers, especially polymers adapted to the transparency of paper, that is to say polymers soluble in CO 2 SC (having a low molecular weight) and whose refractive index is close to that of the cellulose (1.47) paraffin waxes and other molecules with special functional characteristics such as conductive or insulating electrical products, conductive products or thermal insul
- an intense coloration is obtained when it is measured by its K / S value (determined by the Kubelka-Munk equation), for example a coloration whose K / S is greater than or equal to 3, advantageously greater than or equal to 5.
- the impregnation process, in particular staining, according to the invention is advantageously a two-phase process or steps: the first step is that of impregnating the paper with the dye or the molecule of interest chosen and the second stage is a scan with clean supercritical pressure fluid (that is to say, not loaded with dye, respectively molecule of interest to impregnate) so as to remove the dye, respectively the molecule not impregnated paper.
- the first step is that of impregnating the paper with the dye or the molecule of interest chosen and the second stage is a scan with clean supercritical pressure fluid (that is to say, not loaded with dye, respectively molecule of interest to impregnate) so as to remove the dye, respectively the molecule not impregnated paper.
- the process for impregnating a paper, in particular with a dye or a mixture of dyes by means of a supercritical pressure fluid comprises the steps of: a) Loading in a reactor, dry paper to be impregnated and a determined amount of molecule of interest, in particular dye or mixture of dyes, followed by closure of the reactor,
- the fluid is said to be "clean" insofar as it has not been used in the context of steps b) to d) above and is therefore not loaded with the molecule of interest to be impregnated.
- the supercritical pressure fluid is carbon dioxide and the temperature during the supercritical pressure impregnation phase is greater than or equal to the ambient temperature and in particular less than or equal to 200 ° C. C, for example less than or equal to 150 ° C, in particular between 70 ° C and 130 ° C and the pressure during the supercritical pressure impregnation phase is greater than or equal to 75 bar and less than 1000 bars, in particular in a range from 150 bar to 500 bar, preferably 300 bar.
- the stage of passage of the fluid in the supercritical state or in the subcritical state can be done by a progressive increase of the pressure in the reactor or, alternatively, by a rapid increase of the pressure to reach the supercritical pressure.
- the heating and / or pumping step can be arranged depending on the supercritical or sub-critical conditions to be reached. If heating and pumping are done, they can be done in any order. For example, it is possible to achieve temperature conditions of 100 ° C. and a pressure of 75 bars without a pumping step. The conditions of temperature lower than 31 ° C and pressure of 300 bars can be achieved without carrying out the heating step.
- the pumping of the fluid is also advantageously implemented when the paper is introduced into the reactor in the form of a coil: the pumping allows the circulation of the supercritical fluid (forced flow) in the reactor and thus promotes the coloration in the thickness of the reactor. the coil radially from the inside out to the heart of the paper.
- a paper pulp based on cellulose fibers suspended in the water is prepared according to the methods well known to those skilled in the art.
- water and is incorporated in the mass in the suspension a polymeric additive in the form of latex composition.
- the polymeric additive is formulated in the form of a latex, from hydrophobic polymer.
- the polymer molecules are stabilized by means of a surfactant in water and form on drying a water insoluble polymeric network.
- the latex is only to be provided on the surface of the paper, it is for example applied by a size-press step during a processing step after the preparation of the paper sheet.
- the paper can be obtained from a pulp comprising: i) a fibrous suspension based on cellulose fibers in water at a cellulose fiber concentration of 2 to 50 g / l preferably from 15 to 25 g / l, the cellulose fibers being optionally composed of a mixture of cellulose fibers different in their origin and / or by their size, said suspension being refined to at least 17 ° S, preferably 20 ° SR to 45 ° SR, for example 30 to 35 ° SR.
- a polymeric additive in latex form said latex being added to the fibrous suspension in a proportion of 0.5 to 50% by weight of dry product, in particular of 0.5 to 20% by weight of dry product, so preferred from 1 to 15% by weight of dry product and even more preferably from 1 to 10%, del to 5% or from 5 to 10% by weight of dry product, based on the dry weight of the cellulose fibers.
- the paper can be obtained: i) from a paper pulp comprising a fibrous suspension based on cellulose fibers in water at a concentration of cellulose fibers of 2 to 50 g / l preferably at 25 g / l, the cellulose fibers being optionally composed of a mixture of cellulose fibers different in origin and / or size, said suspension being refined to at least 17 ° SR, for example 20 SR at 45 ° SR, preferably 30 ° SR at 35 ° SR, and optionally a polymeric additive in latex form, said latex being added to the fibrous suspension in a proportion of 0.5 to 50% by weight of product dry, in particular from 0.5 to 20% by weight of dry product, preferably from 1 to 15% by weight of dry product and even more preferably from 1 to 10% or from 1 to 5% by weight or from 5 to 10% by weight of dry product, based on the dry weight of the cellulose fiber
- a papermaking process comprising a step of depositing on the surface of the paper a polymeric additive in the form of latex in a proportion by weight of 0.5 to 25%, in particular of 0.5 to 15% or of 0.5 at 10%, based on the weight of the paper.
- the latex used in the context of the invention is an aqueous dispersion of polymer, in particular of copolymer, or an aqueous polymer emulsion, in particular particular copolymer.
- the latex is an ionic dispersion of polymer, in particular of copolymer.
- the latex is a nonionic dispersion of polymer, in particular of copolymer.
- a polymer or copolymer for the preparation of the latex may be hydrocarbon, fluorocarbon or be of organosiloxane type; the monomers constituting the polymer may or may not be organized in the form of a three-dimensional network, before or after the implementation of the papermaking process. It is therefore an example of thermoplastic polymers.
- a latex used in the context of the invention may be crosslinkable (for example thermally crosslinkable or self-crosslinking) and used in crosslinked form.
- the polymer particles consist of monomers or prepolymers capable of thermally polymerizing or via a polymerization initiator. chemical content in the particle.
- the latex obtained can then be in the form of an emulsion, as is for example the fluororesin latex.
- the latex is an aqueous ionic dispersion of polymer particles, in particular of copolymer, optionally crosslinked or crosslinkable, in particular thermally crosslinkable or thermoplastic or self-crosslinking, in particular of which the chains comprise basic groups in the Lewis sense, for example ether, carbonyl, carboxyl or phenyl groups, or mixtures thereof, said polymer or copolymer having a glass transition temperature of less than 100 ° C., preferably in the range of -20 ° C. ° C at 90 ° C, in particular from 0 ° C to 60 ° C for example from 30 to 35 ° C.
- the latex is obtained from a copolymer of which at least one of the monomers is chosen from ether monomers, vinyl, styrene and acrylic monomers, in particular methacrylic and urethane monomers. and dienic.
- the latex is a polymer chosen from the group of copolymers based on acrylate or acrylic ester, copolymers of styrene butadiene, copolymers of ethylene and vinyl acetate polyurethane or ether-urethane copolymers, copolymers of vinyl chloride and ethylene.
- the latex is a polymer selected from the group of styrene-butadiene copolymers, in particular a carboxylated styrene-butadiene copolymer of styrene-acrylic copolymers, for example a styrene-acrylic ester copolymer, copolymers of styrene-butadiene copolymers, acrylic-acrylonitrile ester, copolymers of vinyl ethylene acetate, ether-urethane copolymers.
- Vinyl chloride-vinyl acetate copolymers and copolymers of vinyl chloride-vinyl acetate-ethylene are also disclosed.
- the invention can be carried out using a copolymer of styrene and acrylate (in particular butyl acrylate), a copolymer of acrylic ester and acrylonitrile, a copolymer of acrylate and vinyl acetate, a polyacrylate or a copolymer of acrylic ester, styrene and acrylonitrile.
- a copolymer of styrene and acrylate in particular butylacrylate
- copolymers of acrylic ester and acrylonitrile and copolymers of acrylate and vinyl acetate will be chosen.
- the copolymers are, for example, chosen from copolymers of styrene and acrylate (in particular butylacrylate), copolymer of acrylic ester and acrylonitrile, copolymers of acrylate and of vinyl acetate, styrene-butadiene copolymers, copolymers of ethylene and vinyl acetate, polyacrylates, ether-urethane copolymers, copolymers of acrylic ester, styrene and acrylonitrile, polyurethanes, copolymers of vinyl chloride and ethylene.
- copolymers of styrene and acrylate in particular butylacrylate
- copolymers of acrylic ester and acrylonitrile and copolymers of acrylate and of vinyl acetate copolymers of styrene butadiene
- copolymers of ethylene and vinyl acetate The inventors have observed that the latexes selected advantageously have the capacity to swell in the supercritical pressure fluid, in particular in the CO 2 SC and consequently, they are all the better impregnated in the paper with the chosen molecule and in particular with the dye. Swelling is also promoted when the polymers have a low molecular weight, and / or have a large free volume, and / or a low crystallinity, and / or a low degree of crosslinking.
- the polymer in the form of latex has a low glass transition temperature, and lower than the temperature of the supercritical conditions applied, especially less than 100 ° C and for example preferably comprised in the range from -20 ° C. to 90 °, especially from 0 ° C. to -60 ° C., for example from 30 ° to 35 ° C.
- the latex used is advantageously chosen so as not to negatively affect the mechanical properties, the aging and / or the printability of the paper sheet. It is also advantageously chosen so as not to hinder the manufacture of the paper sheet in the paper machine.
- the invention advantageously makes it possible to prepare papers having a satisfactory degree of water absorption translated by the Cobb value and satisfactory mechanical strength properties, in particular measured in terms of burst index (corresponding to ratio burst / grammage), tear index (corresponding to the ratio tear / basis weight) and breaking length. Values are provided for illustration in the Examples below.
- the pulp or latex composition may further comprise a retention agent consisting of a cationic compound capable of binding the latex to the cellulosic fibers.
- the latex Since the cellulose fibers are of a slightly anionic character, if the latex is also anionic, it creates ionic bonds with the cellulosic fibers via a cationic agent. Under these conditions, the latex is fixed (retained) in the mat or fibrous network during the dewatering step during the manufacture of the paper. When the latex is - more rarely - cationic it is able to attach itself spontaneously to the cellulose fibers.
- Such a retention agent is, for example, a cationic compound chosen from cationic flocculation agents, cationic resins capable of reacting with cellulosic fibers, in particular crosslinkable resins on cellulosic fibers, and cationic starch.
- a cationic resin which is a polyamide-amine-epichlorohydrin resin (also called PAAE or PAE).
- the cellulose fibers of the pulp are a mixture of fibers of different lengths selected from short fibers of length contained in the range of 0, there 0.49 mm, the medium fibers of length contained in the range of 0.5 to 1.5 mm and long fibers of length contained in the range of 1.6 to 3 mm.
- the proportion of cellulosic fibers of a first determined length is 40 to 50% and the proportion of cellulosic fibers of a second determined length is 60 to 50%, in particular the mixture consists of 40% long fibers and 60% short fibers or consists of 50% long fibers and 50% short fibers.
- the ratio retention agent / latex expressed as a percentage of dry retention agent / dry mass of latex is chosen in a range of 0.1% to 20%, in particular of 0 , 1 to 15% and preferably from 0.1% to 13%.
- the cationic retention agent is PAAE
- said ratio can be in a range of 5% to 13% when the latex is anionic and in particular selected from the group of styrene-butadiene copolymers, in particular a styrene copolymer.
- carboxylated butadiene styrene-acrylic copolymers, acrylic-acrylonitrile ester copolymers, vinyl ethylene acetate copolymers, ether-urethane copolymers and vinyl chloride-vinyl acetate copolymers ethylene, in particular is a latex as illustrated in the examples.
- Other compounds may be added to the pulp to adjust the composition depending on the paper to be prepared. These compounds are commonly used in the paper industry. It can be fillers (calcium carbonates, kaolin, talc, titanium dioxide), pigments, bonding agent, dry strength agent, wet strength agent, fluorescent agent, liquid or gas barrier product flame retardant.
- the subject of the invention is also a method of manufacturing paper impregnated with a molecule of interest, in particular colored paper, comprising the following steps: a. Preparation in a pulper of a paper pulp according to the modalities described above or in the examples which follow and preparation of the sheet of paper, b. Loading the paper, the molecule of interest, in particular the dye and the fluid into the reactor, the said fluid being in particular CO 2 , at the fluid storage pressure,
- the invention also relates to the manufacture of a paper impregnated by means of a supercritical pressure fluid, in particular colored paper, comprising the following steps: a. Preparation in a pulper of a pulp as described here,
- step d Spinning for example by means of a press composed of rolls and possibly of felts and drying for example by means of steam-heated cylinders of the sheet obtained in step c. to obtain a leaf with a moisture content of 7% or less
- a surface treatment is applied to the dried sheet, for example a sizing with a sauce or a bath of determined composition, provided by a sizing machine,
- the manufacture of the paper may comprise a step of physicochemical surface treatment of the paper sheet, in particular treatment by application, in particular by coating, of a polymer in latex form (identical or different from the latex incorporated in the mass ) or another polymer. This step can further improve the retention of the impregnated molecules in the paper, particularly that of the colorant in the paper when it has been colored.
- a particular colored paper according to the invention is a colored paper by means of a supercritical pressure fluid, the color of which is stable in a water disgorging test and having for example a composition of short fibers and long fibers in a ratio of 50/50, said paper being for example refined to 30-35 ° SR and comprising a polymeric additive in latex form in a proportion as defined above and in the Examples, in particular comprising from 1 to 5% of polymer introduced in bulk in latex form retained in the fibers by means of a cationic retention agent and having on the surface a layer of a polymeric additive according to the proportions defined above or in the Examples, in particular comprising from 0 to 20 %, preferably from 10 to 15% or from 0.5 to 15% or from 0.5 to 10% by dry weight of polymer in latex form relative to the dry weight of paper, said polymeric additive at the surface being identical or diff rent of polymeric additive introduced mass
- the paper according to the invention has in particular mechanical properties preserved after impregnation and especially after staining such that at least one of the following properties: a Satisfactory degree of water absorption, reflected by the Cobb value, satisfactory mechanical strength properties, in particular measured in terms of burst index (corresponding to burst / grammage ratio), tear index (corresponding to ratio tear / grammage) and breaking length. Values are provided for illustration in the Examples below.
- FIG. 1 depicts the diagram of the supercritical CO 2 impregnation assembly.
- the references numbered 1 to 7 denote valves whose operation is illustrated in the following examples.
- R is the minimum value of the reflectance curve, which is measured over the wavelength range between 400 and 700 nm using a spectrophotometer.
- K / S proportional to the dye concentration, makes it possible to evaluate the intensity of the coloration.
- the chosen composition is a mixture of long fibers (Sodra Black R ® ) and short fibers (Cenibra ® ).
- the fibers of the Cenibra ® type are cellulosic wood fibers derived from eucalyptus, with an average length in the range of 0.5 to 1.5 mm
- the fibers of the Sodra Black R ® type are long cellulosic wood fibers derived from softwood, with an average length in the range of 1.5 to 3 mm.
- each latex Prior to use, each latex was diluted to a solids content of about 10%, controlled and recalculated by a measure of solids.
- the pH of each latex was also adjusted to the pH of the fibrous suspension is about 7.1 and visual control is performed after a few hours or days to detect a possible destabilization of the solution. iii. Preparation of the retention agent
- the retention agent used is a cationic polyelectrolyte: a PAE resin (cationic polyamide-epichlorohydrin), Kymene 617.
- PAE resin cationic polyamide-epichlorohydrin
- Kymene 617 cationic polyamide-epichlorohydrin
- the PAE is diluted and its pH is adjusted to 7.1.
- the amount of PAE necessary for the total retention of each latex on the fibers is defined as follows:
- Bottles suitable for centrifugation are filled with a known and identical amount of fibrous suspension.
- the paper thus produced was colored by a staining or impregnation process using a supercritical fluid which is supercritical CO 2 .
- a supercritical fluid which is supercritical CO 2 .
- the paper was placed inside a closed reactor in which was added a known amount of disperse dye (preferably previously treated Soxhlet extraction to remove the majority of dispersants).
- the dye used was Foron Blue RD-E (Archroma Company) which was pretreated by Soxhlet extraction with acetone. It was then dried to remove all traces of solvent before being finely ground. Thus, 1 g of this pretreated dye was added to the bottom of the reactor.
- This reactor was equipped with an accessory to guide the flow of CO 2 through the paper.
- This accessory consists of a hollow and threaded rod, which is connected to the internal nozzle of the reactor corresponding to the flow inlet. This rod is then welded to a metal cylinder whose internal diameter is 3 cm and whose lower pierced portion can be detached from the assembly in order to introduce the samples to be impregnated.
- the closed reactor was then charged with liquid CO 2 to about 80-90 bar.
- the valves (1), (2), (3), and (4) are open, while the valves (5), (6) and (7) are closed.
- the whole was heated and conditions adjusted to 100 ° C-300bars.
- an overpressure is generated in the reactor core by starting up the pump so that the supercritical CO 2 , then charged with coloring, passes through the reactor. paper for 2 hours.
- the excess pressure thus generated is discharged continuously thanks to the weir set at 300 bar. At the end of 2 hours, we scan the paper with clean CO 2 .
- valves (1), (3) and (4) are closed, the valve (2) remains open and the valves (5) and (6) are open.
- the sweep is maintained for 5 to 10 minutes and then the assembly depressurized (under a light flow of clean CO2) through the valve (7).
- Depressurization makes it possible, on the one hand, for the dye to precipitate at the bottom of the reactor and, on the other hand, for the fluid to pass from the supercritical state to the gaseous state and thus to obtain at the end of the dyeing process.
- impregnation paper samples perfectly dry and colored on the surface as at heart.
- R is the minimum value of the reflectance curve, which is measured over the wavelength range between 400 and 700 nm using a spectrophotometer.
- K / S proportional to the dye concentration
- the colored paper samples were tested in contact with water according to EN NF 646. Thus, two sheets of uncolored glass fiber paper were immersed in the test liquid: distilled water. After saturation, the latter are freed of excess liquid by wiping them on the edge of the container.
- a sheet of uncolored fiberglass paper was deposited, smooth face upward, on a glass plate.
- the test specimen paper sample tested
- Another glass plate was placed on the second sheet of uncoloured fiberglass paper and then the assembly was wrapped in a polyethylene film to prevent drying of the edges. The assembly was placed under a load of 1kg and left standing for 24 hours away from direct penetration of light.
- the assembly was undone.
- the unstained fiberglass paper sheets were placed on three adjacent glass rods, the face having respectively been in contact with the specimen facing upwards.
- the sheets of fiberglass paper were protected from light by being covered without contact, and then left to air-dry at room temperature.
- the coloring of the glass fiber papers was then evaluated against a control, a new uncolored fiberglass paper. In all cases, no staining was observed, which corresponds to a total absence of disgorging.
- the paper thus produced was colored by the dyeing method described in Example 1, paragraph e.
- Disgorging tests were conducted according to the protocol described in Example 1, paragraph f. In all cases, no coloration was observed after 24 hours on non-colored glass fiber papers, which corresponds to a total absence of disgorging.
- Example 3 a) Paper Manufacturing A pulp was prepared in a pulper by mixing fibers in water.
- the composition of the cellulosic fiber mixture is 50% by dry weight of short cellulosic fibers of Cenibra type (eucalyptus-derived wood fibers) and 50% by dry weight of long cellulosic fibers, of the Pacifico type (wood fibers derived from Softwood).
- the dough thus prepared was refined to a Schopper degree of between 30 and 35.
- the dough thus prepared was sent into the headbox of the paper machine and was uniformly distributed on the moving web of the flat table, where it was driped through the mesh of the fabric, by gravity and by suction using suction boxes, to achieve a sheet, as is known to those skilled in the art.
- the paper sheet passed through the press section of the paper machine, and then a dryer made of a series of steam heated cylinders.
- a dryer made of a series of steam heated cylinders.
- the sheet was subjected to surface sizing treatment by passing through a sizing press, composed for example of two rollers arranged side-by-side horizontally to form a bowl fed by a sauce of determined composition.
- the sheet is then passed between the rollers so as to coat its two opposite faces.
- the composition of the sauce was as follows:
- the sheet is finally passed into a so-called post-drying section, into which it has come into contact again with one or more steam-heated rollers, up to a temperature of the order of 120 ° C. b) Characterization of paper properties
- the paper thus produced was colored by a staining or impregnation process using a supercritical fluid which is supercritical CO 2 .
- a paper reel was placed inside a closed reactor in which a known quantity of disperse dye (preferably previously treated with Soxhiet extraction in order to eliminate most of the dispersants) was added.
- the reactor used is designed so that the flow of CO 2 is guided through the thickness of a paper roll. After loading the paper, a quantity of dye equivalent to 2.5 to 5% of the weight of the paper to be impregnated was placed in the reactor. Once the reactor closed, the first step was to charge the reactor with CO 2 at the storage pressure (40-50 bar) and simultaneously the reactor was heated and CO 2 pumped to reach the working conditions: a temperature between 100 and 115 ° C and a pressure between 270 and 300 bar. Circulation was ensured by means of a pump. Thus, the supercritical CO 2 charged with dissolved dye was sent through the thickness of the coil, radially from the inside to the outside.
- Disgorging tests were conducted according to the protocol described in Example 1, paragraph f. In all cases, regardless of the dye or the mixture of dyes used, no coloration was observed after 24 hours on non-colored glass fiber papers, which corresponds to a total absence of disgorging.
- Example 4 a) Paper Manufacturing
- a pulp is prepared in a pulper by mixing fibers in water.
- the composition of the cellulosic fiber mixture is 3/5 of short cellulosic fibers of the Cenibra type (eucalyptus wood fibers) and 2/5 of long cellulosic fibers, of the Sodra Black type (softwood fibers).
- the dough thus prepared is refined to a Schopper degree of between 40 and 42.
- To this mixture is added, based on the dry weight of the cellulose fibers, 3% of cationic starch (Solvitose PVL prepared at 3% in water). The mixture is stirred for about 1 hour.
- calcium carbonate type fillers (Calprec PA) are introduced into the mixture at a level of 8% by dry weight relative to the dry weight of the fibers and stirred for 20 minutes.
- a defined amount of latex is then added.
- the papers No. 1, 2, 3 and 4 correspond to the addition respectively of 0, 1, 5 and 10% dry relative to the weight of the fibers of a latex of butyl acrylate and styrene, the Acronal S 996 S.
- the mixture is then homogenized for 10 to 20 minutes before being sent to the headbox.
- the composition of this paste is adjusted by continuously adding 0.15% by dry weight relative to the weight of the fibers of an AKD type bonding agent (alkylketene dimers). ).
- an AKD type bonding agent alkylketene dimers.
- Aquapel F215 is used.
- the dough thus prepared is sent into the headbox of the paper machine and is evenly distributed on the moving web of the flat table, where it will undergo drainage through the mesh of the fabric, by gravity and by suction. using suction boxes, to achieve a sheet of 80g / m 2 , as known to those skilled in the art.
- the sheet of paper passes through the section of the presses of the paper machine, then a dryer composed of a series of steam heated cylinders.
- a post-treatment is performed in the laboratory.
- the sheet undergoes surface sizing treatment by passing through a laboratory sizing machine, consisting of two rollers arranged horizontally side-by-side to form a bowl fed with a sauce of specific composition.
- the sheet then passes between the rollers so as to coat its two opposite faces.
- This post-treatment is representative of a press-gluing treatment on an industrial paper machine.
- compositions of the sauces are as follows:
- the paper thus produced is colored by the dyeing process described in Example 1, paragraph e.
- Papers made without depositing latex on the surface are stained homogeneously throughout the thickness.
- the intensity of the color being dependent on the amount of latex added, it is thus possible to produce papers whose hues vary from a pastel tone to a very intense color.
- the adjustment of the latex ratio between the mass and the surface makes it possible in certain cases to increase the intensity of coloration while keeping the homogeneity of the coloring in the thickness of the paper. This is the case, for example, of paper No. 3 containing 5% of latex in mass and on which we have produced a surface deposit of 2.7 g / m 2 .
- this allows for low-end papers by limiting the amount of latex used.
- the latter for example paper No. 2 on which a deposit of 3.76 g / m 2 of latex is produced, then have a high intensity of surface coloration but a color gradient is visible during the tear.
- a colored paper was produced according to the teaching of the patent application F 3,015,988 using amphiphilic molecules (CTAB and AOT in an equimolar mixture) as additives for the preparation of paper. a) Paper manufacturing
- the paper thus produced is colored by the dyeing process described in Example 1, paragraph e.
- Disgorging tests were conducted according to the protocol described in Example 1, paragraph f. In the case of an intense blue commercial paper whose coloring is obtained by a standard papermaking process, a large disgorging is observed already after 1 hour on the non-colored glass fiber papers.
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Application Number | Priority Date | Filing Date | Title |
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FR1652246A FR3048982B1 (fr) | 2016-03-16 | 2016-03-16 | Procede de fabrication de papier impregne par un fluide a pression supercritique - papier impregne, notamment colore |
PCT/FR2017/050607 WO2017158302A1 (fr) | 2016-03-16 | 2017-03-16 | Procédé de fabrication de papier imprégné par un fluide à pression supercritique - papier imprégné, notamment coloré |
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EP3430199A1 true EP3430199A1 (fr) | 2019-01-23 |
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EP17716947.1A Pending EP3430199A1 (fr) | 2016-03-16 | 2017-03-16 | Procédé de fabrication de papier imprégné par un fluide à pression supercritique - papier imprégné, notamment coloré |
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US (1) | US11091878B2 (fr) |
EP (1) | EP3430199A1 (fr) |
FR (1) | FR3048982B1 (fr) |
WO (1) | WO2017158302A1 (fr) |
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WO2020102605A1 (fr) * | 2018-11-15 | 2020-05-22 | The Regents Of The University Of California | Fibres revêtues de vésicules et leurs procédés de fabrication et d'utilisation |
FR3102478B1 (fr) | 2019-10-29 | 2021-09-24 | Commissariat Energie Atomique | Procédé de préparation d’un composé comprenant au moins une fonction imine par une réaction de condensation spécifique et application particulière de ce procédé au domaine de la coloration |
CN111622018B (zh) * | 2020-05-14 | 2021-12-31 | 仙鹤股份有限公司 | 一种大墨位印刷圣经纸的生产方法 |
FR3120638A1 (fr) * | 2021-03-11 | 2022-09-16 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede d’impregnation sequentielle d’un substrat cellulosique, le dispositif ainsi obtenu, et ses utilisations |
CN116161764B (zh) * | 2023-02-14 | 2024-07-23 | 重庆大学 | 一种低压紫外光引发的环保型阴离子淀粉基絮凝剂及其制备方法 |
CN116377768A (zh) * | 2023-04-24 | 2023-07-04 | 深圳市山峰智动科技有限公司 | 竹浆餐具直压式生产方法 |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
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US1926614A (en) | 1931-07-24 | 1933-09-12 | Du Pont | Fixation of dyes on colored paper |
DE1155203B (de) | 1958-12-19 | 1963-10-03 | Du Pont | Verfahren zur Herstellung von polymeren Farbstoffen von kettenartiger Molekularstruktur |
DE1802467A1 (de) | 1968-10-11 | 1970-05-27 | Bayer Ag | Pigmentfarbstoffe |
DE2123963A1 (en) | 1971-05-14 | 1972-11-23 | Farbenfabriken Bayer Ag, 5090 Leverkusen | Anthraquinone pigments - and vat dyes, for cellulose fibres, paints, printing inks and plastics |
DE2138014A1 (de) | 1971-07-29 | 1973-02-08 | Bayer Ag | Disazofarbstoffe |
CH585249A5 (en) | 1974-10-04 | 1977-02-28 | Sandoz Ag | Soluble anionic trisazo dyes of aromatic series - for natural and synthetic fibres, esp. leather (BE020476) |
CH585244A5 (fr) | 1973-10-05 | 1977-02-28 | Sandoz Ag | |
DE2659676C2 (de) | 1976-12-30 | 1987-02-05 | Bayer Ag, 5090 Leverkusen | Azoanthrachinonpigmente, deren Herstellung und Verwendung |
DE2805234A1 (de) | 1978-02-08 | 1979-08-09 | Sandoz Ag | Pigmentfarbstoffe der isoindolinonreihe |
CH638548A5 (de) | 1978-07-21 | 1983-09-30 | Ciba Geigy Ag | Kationische oxazinfarbstoffe. |
DE3044563A1 (de) | 1980-11-26 | 1982-07-08 | Basf Ag, 6700 Ludwigshafen | Imidazolylmethylengruppen enthaltende farbstoffe und deren verwendung |
DE3041838A1 (de) | 1980-11-06 | 1982-07-01 | Basf Ag, 6700 Ludwigshafen | Verfahren zum faerben von papierstoffen |
US4510019A (en) | 1981-05-12 | 1985-04-09 | Papeteries De Jeand'heurs | Latex containing papers |
US4612251A (en) | 1982-07-30 | 1986-09-16 | Arjomari-Prioux | Paper sheet having a very high proportion of latex, process for preparing same and applications thereof particularly as a substitution product for impregnated glass webs |
US5895557A (en) | 1996-10-03 | 1999-04-20 | Kimberly-Clark Worldwide, Inc. | Latex-saturated paper |
FR2795082B1 (fr) * | 1999-06-01 | 2002-07-12 | Essilor Int | Procede d'impregnation d'un latex par un additif, latex obtenu et son application en optique |
JP3971770B2 (ja) | 2005-04-18 | 2007-09-05 | 三菱鉛筆株式会社 | 着色剤組成物及び着色方法 |
FR2916769B1 (fr) | 2007-05-31 | 2009-08-28 | Arjowiggins Licensing Soc Par | Feuille de papier transparente ou translucide, son procede de fabrication et emballage le contenant |
BR112012029267A2 (pt) | 2010-05-17 | 2016-07-26 | Basf Se | método para fabricação de papel, e, folha de papel |
CN102877363B (zh) | 2012-10-12 | 2014-12-24 | 上海典旗材料科技有限公司 | 浸染式纸张染色方法 |
FR3005320B1 (fr) | 2013-05-02 | 2015-11-20 | Arjo Wiggins Fine Papers Ltd | Support plan hydrophobe |
EP2876203A1 (fr) | 2013-11-25 | 2015-05-27 | CEPI aisbl | CO2 supercritique |
FR3015988B1 (fr) * | 2013-12-27 | 2022-11-11 | Arjo Wiggins Fine Papers Ltd | Impregnation d'un papier a l'aide d'un fluide supercritique |
FR3018832B1 (fr) * | 2014-03-21 | 2016-04-01 | Commissariat Energie Atomique | Procede de coloration de la cellulose |
-
2016
- 2016-03-16 FR FR1652246A patent/FR3048982B1/fr not_active Expired - Fee Related
-
2017
- 2017-03-16 US US16/085,794 patent/US11091878B2/en active Active
- 2017-03-16 EP EP17716947.1A patent/EP3430199A1/fr active Pending
- 2017-03-16 WO PCT/FR2017/050607 patent/WO2017158302A1/fr active Application Filing
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FR3048982A1 (fr) | 2017-09-22 |
US11091878B2 (en) | 2021-08-17 |
US20190330801A1 (en) | 2019-10-31 |
FR3048982B1 (fr) | 2020-09-25 |
WO2017158302A1 (fr) | 2017-09-21 |
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