WO2003052203A2 - Coated paper with silky feel - Google Patents

Coated paper with silky feel Download PDF

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Publication number
WO2003052203A2
WO2003052203A2 PCT/FR2002/004378 FR0204378W WO03052203A2 WO 2003052203 A2 WO2003052203 A2 WO 2003052203A2 FR 0204378 W FR0204378 W FR 0204378W WO 03052203 A2 WO03052203 A2 WO 03052203A2
Authority
WO
WIPO (PCT)
Prior art keywords
paper
coating composition
coated
equal
pigments
Prior art date
Application number
PCT/FR2002/004378
Other languages
French (fr)
Other versions
WO2003052203A3 (en
Inventor
Gaël DEPRES
Original Assignee
Arjo Wiggins Dessin Et Papiers Fins
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
Priority to EP02801137A priority Critical patent/EP1458930B1/en
Priority to CA2469016A priority patent/CA2469016C/en
Application filed by Arjo Wiggins Dessin Et Papiers Fins filed Critical Arjo Wiggins Dessin Et Papiers Fins
Priority to BRPI0207323-4A priority patent/BR0207323B1/en
Priority to KR1020047009271A priority patent/KR100956864B1/en
Priority to AU2002364844A priority patent/AU2002364844B2/en
Priority to AT02801137T priority patent/ATE526455T1/en
Priority to US10/498,066 priority patent/US20050031851A1/en
Priority to HU0600861A priority patent/HUP0600861A2/en
Priority to NZ533961A priority patent/NZ533961A/en
Priority to JP2003553068A priority patent/JP4669223B2/en
Priority to MXPA04005869A priority patent/MXPA04005869A/en
Publication of WO2003052203A2 publication Critical patent/WO2003052203A2/en
Priority to NO20033545A priority patent/NO20033545D0/en
Priority to ZA2003/06262A priority patent/ZA200306262B/en
Publication of WO2003052203A3 publication Critical patent/WO2003052203A3/en
Priority to HK05108237A priority patent/HK1076133A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
    • 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
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape
    • D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
    • 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
    • D21H19/72—Coated paper characterised by the paper substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/254—Polymeric or resinous material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • Y10T428/277—Cellulosic substrate

Definitions

  • the present invention relates to a coating composition comprising microbeads of polyurethane and to paper coated on at least one side of said coating composition, and advantageously on both sides.
  • Papers of various types or compositions can be coated so as to increase the quality of their surface.
  • a coating composition conventionally used for this purpose is a dispersion comprising pigments, which can be organic or inorganic.
  • the coating composition may also contain other additives.
  • Papers for printing such as papers for books, magazines, brochures, or annual reports, or papers for packaging are often made by coating a backing paper with one or more units bedding, sometimes followed by calendering.
  • the final product must generally have improved surface characteristics for the use that is made of it.
  • the Applicant therefore proposed to provide a characteristic which evokes the destination, namely the skin, that is to say the touch, the softness of the skin.
  • the desired feel could be obtained by applying to the surface of the sheet a layer which included expandable thermoplastic microspheres.
  • This patent aimed inter alia to solve the problems of machinability of these sheets during printing, in particular the problems of separation of sheets in the stacks due to the anti-slip properties of the added microspheres.
  • coated fine papers often raise serious problems during printing or during processing operations, the most common being in the context of offset printing: dusting and smudging.
  • Powdering corresponds to the detachment of the layer in the form of dry powder during printing, a phenomenon which can be accentuated with successive passages of the sheet in printing or processing machines.
  • This phenomenon comes from a poor binder / pigment dosage, the pigment being too high in percentage relative to the binder.
  • the smearing corresponds to the transfer of printing from one sheet to another during a stacking in particular.
  • Paper can contribute to this phenomenon because a paper that is not suitable for ink may have poor ink reception capacity and that paper with an irregular surface finish requires too much ink for printing. correct.
  • a first object of the invention is therefore to provide a coating composition for coated papers intended to be offset printed, characterized in that the pigments used in the layer are microbeads of polyurethanes having an average size of less than 10 micrometers, and advantageously close to 7 micrometers.
  • the invention is characterized in that the binder used in the layer is an aqueous polyurethane emulsion, and preferably a soft polyurethane having a rate of elongation greater than or equal to 500%.
  • the invention is characterized in that the level of binder relative to the pigments is greater than or equal to 40% by dry weight, and preferably greater than or equal to 200%.
  • Another object of the invention is to provide a coated paper having a silky feel, comprising at least one face coated with a coating composition as defined above, and advantageously these two faces.
  • Said paper is characterized by the fact that it can be printed in offset with smudging and little or no dusting.
  • the paper is based on cellulose fibers, and has a basis weight between 70 and 500 g / m, preferably between 100 and 300 g / m.
  • the paper is transparent or translucent. More particularly, the paper constitutes a tracing paper.
  • Tracing paper is understood to mean paper as defined by the international standard ISO 4046-1978 in point 6.94.
  • the invention is characterized in that the said paper is a tracing paper, in particular obtained by a thorough refining of the cellulose fibers composing it.
  • the invention is characterized by the fact that the weight of said layer on at least one of the faces is between 2 and 10 g / m 2 in dry conditions, preferably between 3 and 6 g / m.
  • Said paper is also characterized by a dynamic coefficient of friction between its front side coated and its other back side also coated less than or equal to 1.0, measurement made according to standard NF-Q-03-082 with a pad of 200 g.
  • the dynamic friction coefficient reflects the ability of the sheet to block at the start of a movement; the higher it is, the more difficult it will be to start a movement of a leaf in a pile.
  • composition comprising polyurethane microbeads of different sizes, as mentioned in Table 1, is applied using an air knife coater, at a rate of approximately 5 g / m per side.
  • composition comprising polyurethane microbeads is produced in an aqueous medium and contains by dry weight: 24.7 parts of water 0.1 part of wetting agent
  • composition comprising polyurethane microbeads of average size close to 7 micrometers at a rate of approximately 5 g / m 2 in dryness per side, by varying the rate of binder relative to the weight of pigment as mentioned in table 2.
  • the composition comprising polyurethane microbeads is produced in an aqueous medium and contains, by dry weight: variable dry parts of an aqueous emulsion of polyurethane Rolflex PAD
  • the feel of the face comprising the layer of polyurethane microbeads is manually appreciated.
  • the response of the virgin paper to the dusting test is determined so as to demonstrate the propensity of the layer to disintegrate during a machine pass.
  • the dusting test is carried out as follows: a) a 40 mm X 40 mm pad weighing 2 kg is applied mounted on a carriage and covered with a black felt fabric (mixture of 70% wool , 30% polyamide) on one or more sheets of paper coated with said layer, b) a single pass is made on the paper so as to cover a total length of 6 mc) the felt is removed from the pad d) the reflectivity is measured felt using an ELREPHO device (the measured value being approximately 1, 4 for the raw fabric) the response of the printed paper to the smearing test is determined so as to demonstrate the propensity of the paper to cause smearing during machine stacking.
  • ELREPHO device the measured value being approximately 1, 4 for the raw fabric
  • the smear test is carried out as follows: a) specimens of the test paper 48 mm wide and 250 mm long are prepared b) a PRUFB AU test apparatus is used having a printing station n ° 1 and a station n ° 2 for printing transfer c) the pressure of station n ° 1 is adjusted to 1000 N and the pressure of station n ° 2 to 400 N d) the speed of the machine is adjusted to 0.5 m / sec e) the inking roller of station n ° l is inked for 30 sec with blue ink of the HUBER 408010 type f) a conveyor with a test tube is placed in front of station n ° lg) a wheel is placed not inked on station no.
  • the test piece is printed on station no. li) the stopwatch is started immediately after printing j) a test piece of the same paper is placed on an adhesive sheet blank wheel of station n ° 2 k) once 120 seconds have elapsed on the stopwatch, the transporter with the printed test tube is engaged up to the blank level chet
  • test piece from station 2 is immediately separated from its wheel m) the optical density of the cyan transferred to the blank test piece is measured using an XRITE densitometer.
  • Figures 1 and 2 There is shown in Figures 1 and 2 a view to a scanning electron microscope of a paper having from the point of view of the applicant a silky touch.
  • This paper was obtained by depositing on a CONQUEROR CX 22 support paper having a grammage of 100 g / m the following layer composition on these two faces:
  • the paper obtained was then calendered.
  • the photographs respectively represent a top view magnified 200 times and a section view magnified 2000 times.
  • the paper obtained actually has a silky feel on these two sides.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention concerns a coating composition for coated paper designed to be offset printed, characterized in that the coating pigments are polyurethane microbeads having a size less than 10 micrometers, and advantageously, close to 7 micrometers. The invention also concerns a paper having a silky feel, comprising at least one side coated with said coating composition, and advantageously, both sides. Said paper is characterized in that it can be offset printed with little, even without, set-off or powdering.

Description

PAPIER COUCHE POSSEDANT UN TOUCHER SOYEUX COATING PAPER HAVING A SILKY TOUCH
La présente invention se rapporte à une composition de couchage comprenant des microbilles de polyurethane et au papier enduit sur au moins une face de ladite composition de couchage, et de manière avantageuse sur ses deux faces.The present invention relates to a coating composition comprising microbeads of polyurethane and to paper coated on at least one side of said coating composition, and advantageously on both sides.
Des papiers de types ou de compositions diverses peuvent être couchés de façon à accroître la qualité de leur surface.Papers of various types or compositions can be coated so as to increase the quality of their surface.
Une composition de couchage utilisée de manière conventionnelle dans ce but est une dispersion comprenant des pigments, lesquels peuvent être organiques ou minéraux.A coating composition conventionally used for this purpose is a dispersion comprising pigments, which can be organic or inorganic.
La composition de couchage peut également comporter d'autres additifs. Des papiers destinés à l'impression, tels que des papiers pour livres, magazines, brochures, ou rapports annuels, ou encore des papiers destinés à l'emballage sont souvent fabriqués en enduisant un papier support à l'aide d'une ou plusieurs unités de couchage, suivis parfois d'un calandrage.The coating composition may also contain other additives. Papers for printing, such as papers for books, magazines, brochures, or annual reports, or papers for packaging are often made by coating a backing paper with one or more units bedding, sometimes followed by calendering.
Le produit final doit en général posséder des caractéristiques de surface améliorées pour l'usage qui en est fait.The final product must generally have improved surface characteristics for the use that is made of it.
Ces caractéristiques de surface se traduisent pour l'essentiel par une modification de l'aspect visuel du papier soit par accroissement de sa blancheur, de sa brillance, ou encore de son opacité.These surface characteristics essentially translate into a change in the visual appearance of the paper, either by increasing its whiteness, its gloss, or its opacity.
La recherche d'un certain toucher de surface pour la feuille recouverte de la couche est en soi assez nouveau.The search for a certain surface feel for the sheet covered with the layer is in itself quite new.
Dans le brevet antérieur FR 2791368, la Demanderesse s'était intéressée à fournir une feuille d'emballage qui comporterait une caractéristique qui rappellerait l'une des caractéristiques essentielles du produit à emballer, en particulier pour les produits cosmétiques à appliquer sur la peau.In the previous patent FR 2791368, the Applicant was interested in providing a packaging sheet which would include a characteristic which would recall one of the essential characteristics of the product to be packaged, in particular for cosmetic products to be applied to the skin.
La Demanderesse proposait donc de fournir une caractéristique qui évoque la destination, à savoir la peau, c'est-à-dire le toucher, la douceur de la peau.The Applicant therefore proposed to provide a characteristic which evokes the destination, namely the skin, that is to say the touch, the softness of the skin.
Le toucher recherché pouvait être obtenu en appliquant à la surface de la feuille une couche qui comportait des microsphères thermoplastiques expansibles. Ce brevet visait entre autre à résoudre les problèmes de machinabilité de ces feuilles lors de l'impression, notamment les problèmes de séparation de feuilles dans les piles du fait des propriétés anti glisse des microsphères ajoutées.The desired feel could be obtained by applying to the surface of the sheet a layer which included expandable thermoplastic microspheres. This patent aimed inter alia to solve the problems of machinability of these sheets during printing, in particular the problems of separation of sheets in the stacks due to the anti-slip properties of the added microspheres.
D'une manière générale, les papiers fins couchés soulèvent souvent de sérieux problèmes lors de l'impression ou lors d'opérations de transformation, les plus courants étant dans le cadre d'une impression offset : le poudrage et le maculage.In general, coated fine papers often raise serious problems during printing or during processing operations, the most common being in the context of offset printing: dusting and smudging.
Le poudrage correspond au détachement de la couche sous forme de poudre sèche durant l'impression, phénomène qui peut s'accentuer avec les passages successifs de la feuille dans les machines d'impression ou de transformation.Powdering corresponds to the detachment of the layer in the form of dry powder during printing, a phenomenon which can be accentuated with successive passages of the sheet in printing or processing machines.
Ce phénomène vient d'un mauvais dosage liant/pigment, le pigment étant en pourcentage trop important par rapport au liant.This phenomenon comes from a poor binder / pigment dosage, the pigment being too high in percentage relative to the binder.
Il peut provenir également de la taille et de la forme des particules de pigment. Le maculage correspond au report d'impression d'une feuille à l'autre lors d'une mise en pile notamment.It can also come from the size and shape of the pigment particles. The smearing corresponds to the transfer of printing from one sheet to another during a stacking in particular.
On observe ainsi souvent au verso d'une feuille des tâches d'encre plus ou moins intenses qui proviennent de l'encre du recto de la feuille du dessous.We often observe on the back of a sheet more or less intense ink stains that come from the ink on the front of the sheet below.
Lorsque l'on défait la pile, on entend plus ou moins fort le crissement des feuilles. Ce phénomène, s'il est faible, se nomme le maculage.When you undo the stack, you can hear the screeching of the leaves more or less loudly. This phenomenon, if it is weak, is called smudging.
C'est du piquetage si des éléments de papier participent au décollement. C'est du collage en pile si on ne peut plus séparer les feuilles les unes des autres.It is picketing if pieces of paper participate in detachment. It is collage in a pile if we can no longer separate the sheets from each other.
Le papier peut participer à ce phénomène du fait qu'un papier non adapté à l'encre peut avoir une mauvaise capacité d'accueil de l'encre et qu'un papier possédant un état de surface irrégulier demande trop d'encre pour une impression correcte.Paper can contribute to this phenomenon because a paper that is not suitable for ink may have poor ink reception capacity and that paper with an irregular surface finish requires too much ink for printing. correct.
Au vu de ces considérations, la Demanderesse s'est attachée à fournir un papier ayant un toucher soyeux, couchés de préférence sur ces deux faces et ne présentant pas les problèmes d'imprimabilité et de machinabilité énoncés ci-dessus. Un premier but de l'invention est donc de fournir une composition de couchage pour papiers couchés destinés à être imprimés en offset, caractérisée par le fait que les pigments utilisés dans la couche sont des microbilles de polyuréthanes possédant une taille moyenne inférieure à 10 micromètres, et de manière avantageuse proche de 7 micromètres.In view of these considerations, the Applicant has endeavored to provide a paper having a silky feel, preferably coated on these two faces and not exhibiting the printability and machinability problems set out above. A first object of the invention is therefore to provide a coating composition for coated papers intended to be offset printed, characterized in that the pigments used in the layer are microbeads of polyurethanes having an average size of less than 10 micrometers, and advantageously close to 7 micrometers.
En particulier, l'invention se caractérise par le fait que le liant utilisé dans la couche est une émulsion aqueuse de polyurethane, et de préférence un polyurethane mou possédant un taux d'élongation supérieur ou égal à 500 %.In particular, the invention is characterized in that the binder used in the layer is an aqueous polyurethane emulsion, and preferably a soft polyurethane having a rate of elongation greater than or equal to 500%.
En particulier, l'invention se caractérise par le fait que le taux de liant par rapport aux pigments est supérieur ou égal à 40 % en poids sec, et de préférence supérieur ou égal à 200 %.In particular, the invention is characterized in that the level of binder relative to the pigments is greater than or equal to 40% by dry weight, and preferably greater than or equal to 200%.
Un autre but de l'invention est de fournir un papier couché possédant un toucher soyeux, comportant au moins une face enduite d'une composition de couchage telle que définie ci-dessus, et de manière avantageuse ces deux faces. Ledit papier se caractérise par le fait qu'il peut être imprimé en offset avec un maculage et un poudrage faible, voire inexistant.Another object of the invention is to provide a coated paper having a silky feel, comprising at least one face coated with a coating composition as defined above, and advantageously these two faces. Said paper is characterized by the fact that it can be printed in offset with smudging and little or no dusting.
Le papier est à base de fibres de cellulose, et possède un grammage compris entre 70 et 500 g/m , de préférence entre 100 et 300 g/m .The paper is based on cellulose fibers, and has a basis weight between 70 and 500 g / m, preferably between 100 and 300 g / m.
Selon un cas particulier, le papier est transparent ou translucide. Plus particulièrement, le papier constitue un papier calque.According to a particular case, the paper is transparent or translucent. More particularly, the paper constitutes a tracing paper.
On entend par papier calque, un papier tel que défini par la norme internationale ISO 4046-1978 au point 6.94.Tracing paper is understood to mean paper as defined by the international standard ISO 4046-1978 in point 6.94.
Plus particulièrement, l'invention se caractérise par le fait que le dit papier est un papier calque, en particulier obtenu par un raffinage poussé des fibres de cellulose le composant.More particularly, the invention is characterized in that the said paper is a tracing paper, in particular obtained by a thorough refining of the cellulose fibers composing it.
En particulier, l'invention se caractérise par le fait que le poids de ladite couche sur au moins l'une des faces est compris entre 2 et 10 g/m2 en sec, de préférence entre 3 et 6 g/m .In particular, the invention is characterized by the fact that the weight of said layer on at least one of the faces is between 2 and 10 g / m 2 in dry conditions, preferably between 3 and 6 g / m.
Ledit papier se caractérise également par un coefficient de frottement dynamique entre sa face recto couchée et son autre face verso également couchée inférieur ou égal à 1,0, mesure faite selon la norme NF-Q-03-082 avec un patin de 200 g.Said paper is also characterized by a dynamic coefficient of friction between its front side coated and its other back side also coated less than or equal to 1.0, measurement made according to standard NF-Q-03-082 with a pad of 200 g.
Le coefficient de frottement dynamique reflète l'aptitude de la feuille à se bloquer au départ d'un déplacement ; plus il est élevé, plus l'amorce d'un mouvement d'une feuille dans une pile sera difficile.The dynamic friction coefficient reflects the ability of the sheet to block at the start of a movement; the higher it is, the more difficult it will be to start a movement of a leaf in a pile.
Des exemples comparatifs et des exemples non limitatifs de réalisation de l'invention et d'autres avantages, éventuellement, sont décrits ci-après.Comparative examples and nonlimiting examples of embodiment of the invention and other advantages, if any, are described below.
EXEMPLES :EXAMPLES:
Exemples 1 à 5 :Examples 1 to 5:
Sur une feuille de papier support ayant un grammage de 100 g/m , plus spécifiquement la référence CONQUEROR CX 22 commercialisé par laOn a sheet of support paper having a grammage of 100 g / m, more specifically the reference CONQUEROR CX 22 marketed by
Demanderesse, on applique, à l'aide d'une coucheuse à lame d'air, une composition comprenant des microbilles de polyurethane de différentes tailles comme mentionné dans le tableau 1 , à raison de 5 g/m environ par face.Applicant, a composition comprising polyurethane microbeads of different sizes, as mentioned in Table 1, is applied using an air knife coater, at a rate of approximately 5 g / m per side.
La composition comprenant des microbilles de polyurethane est réalisée en milieu aqueux et contient en poids sec : 24,7 parts d'eau 0,1 part d'agent mouillantThe composition comprising polyurethane microbeads is produced in an aqueous medium and contains by dry weight: 24.7 parts of water 0.1 part of wetting agent
33,3 parts d'une émulsion aqueuse de polyurethane Witcobond 290 H 20 parts de microbilles de polyurethane - 0,5 part de régulateur de pH33.3 parts of a Witcobond 290 H polyurethane aqueous emulsion 20 parts of polyurethane microbeads - 0.5 part of pH regulator
1 part d'épaississant.1 part thickener.
Exemples 6 à 13 :Examples 6 to 13:
Sur une feuille de papier support ayant un grammage de 100 g/m2, plus spécifiquement la référence CONQUEROR CX 22 commercialisé par la Demanderesse, on applique, à l'aide d'une coucheuse à lame d'air, une composition comprenant des microbilles de polyurethane de taille moyenne voisine de 7 micromètres à raison de 5 g/m en sec environ par face, en faisant varier le taux de liant par rapport au poids de pigment comme mentionné dans le tableau 2. La composition comprenant des microbilles de polyurethane est réalisée en milieu aqueux et contient en poids sec : parts sèches variables d'une émulsion aqueuse de polyurethane Rolflex PADOn a sheet of support paper having a grammage of 100 g / m 2 , more specifically the reference CONQUEROR CX 22 sold by the Applicant, we apply, using an air layer coater, a composition comprising polyurethane microbeads of average size close to 7 micrometers at a rate of approximately 5 g / m 2 in dryness per side, by varying the rate of binder relative to the weight of pigment as mentioned in table 2. The composition comprising polyurethane microbeads is produced in an aqueous medium and contains, by dry weight: variable dry parts of an aqueous emulsion of polyurethane Rolflex PAD
20 parts de microbilles de polyurethane Daiplacoat RHU 5070 - 0,5 part de régulateur de pH20 parts of Daiplacoat RHU 5070 polyurethane microbeads - 0.5 part of pH regulator
1 part d'un épaississant1 part of a thickener
REALISATION DES TESTS :PERFORMING TESTS:
On apprécie manuellement le toucher de la face comportant la couche de microbilles de polyurethane. - On détermine la réponse du papier vierge au test de poudrage de façon à mettre en évidence la propension de la couche à se déliter lors d'un passage machine. Le test de poudrage se fait de la manière suivante : a) on applique un patin de 40 mm X 40 mm et d'un poids de 2 kg monté sur un chariot et recouvert d'un feutre noir en tissu (mélange de 70 % laine, 30 % polyamide) sur une ou plusieurs feuilles de papier enduites de ladite couche, b) on effectue un seul passage sur le papier de façon à couvrir une longueur totale de 6 m c) on retire le feutre du patin d) on mesure la réflectivité du feutre à l'aide d'un appareil ELREPHO ( la valeur mesurée étant d'environ 1 ,4 pour le tissu brut) on détermine la réponse du papier imprimé au test de maculage de façon à mettre en évidence la propension du papier à provoquer un maculage lors d'un empilage machine. Le test de maculage se fait de manière suivante : a) on prépare des éprouvettes du papier à tester faisant 48 mm de large et 250 mm de long b) on utilise un appareil de test PRUFB AU possédant un poste n° 1 d'impression et un poste n°2 de report d'impression c) on règle la pression du poste n°l à 1000 N et la pression du poste n°2 à 400 N d) on règle la vitesse de l'appareil à 0,5 m/sec e) on encre le rouleau d'encrage du poste n°l durant 30 sec avec une encre bleue de type HUBER 408010 f) on place un transporteur muni d'une eprouvette devant le poste n°l g) on place une molette non encrée sur le poste n°2 h) on imprime l' eprouvette sur le poste n°l i) on déclenche le chronomètre immédiatement après l'impression j) on place à l'aide d'une bande adhésive une eprouvette du même papier sur la molette vierge du poste n°2 k) une fois que 120 sec se sont écoulées sur le chronomètre, on engage le transporteur muni de l'éprouvette imprimée jusqu'au niveau du blanchetThe feel of the face comprising the layer of polyurethane microbeads is manually appreciated. - The response of the virgin paper to the dusting test is determined so as to demonstrate the propensity of the layer to disintegrate during a machine pass. The dusting test is carried out as follows: a) a 40 mm X 40 mm pad weighing 2 kg is applied mounted on a carriage and covered with a black felt fabric (mixture of 70% wool , 30% polyamide) on one or more sheets of paper coated with said layer, b) a single pass is made on the paper so as to cover a total length of 6 mc) the felt is removed from the pad d) the reflectivity is measured felt using an ELREPHO device (the measured value being approximately 1, 4 for the raw fabric) the response of the printed paper to the smearing test is determined so as to demonstrate the propensity of the paper to cause smearing during machine stacking. The smear test is carried out as follows: a) specimens of the test paper 48 mm wide and 250 mm long are prepared b) a PRUFB AU test apparatus is used having a printing station n ° 1 and a station n ° 2 for printing transfer c) the pressure of station n ° 1 is adjusted to 1000 N and the pressure of station n ° 2 to 400 N d) the speed of the machine is adjusted to 0.5 m / sec e) the inking roller of station n ° l is inked for 30 sec with blue ink of the HUBER 408010 type f) a conveyor with a test tube is placed in front of station n ° lg) a wheel is placed not inked on station no. 2 h) the test piece is printed on station no. li) the stopwatch is started immediately after printing j) a test piece of the same paper is placed on an adhesive sheet blank wheel of station n ° 2 k) once 120 seconds have elapsed on the stopwatch, the transporter with the printed test tube is engaged up to the blank level chet
1) on sépare immédiatement l'éprouvette du poste n°2 de sa molette m) on mesure à l'aide d'un densitomètre XRITE la densité optique du cyan reporté sur l'éprouvette vierge.1) the test piece from station 2 is immediately separated from its wheel m) the optical density of the cyan transferred to the blank test piece is measured using an XRITE densitometer.
RESULTATS :RESULTS:
Les résultats des tests pour les exemples 1 à 5 sont présentés dans le tableau 1. On constate que, même si la plupart des papiers ont une réponse aux tests de maculage et de poudrage plutôt satisfaisant, seules des tailles de microbilles inférieures à 10 micromètres permettent d'obtenir un toucher soyeux acceptable. Les résultats des tests pour les exemples 6 à 13 permettent de conclure qu'en choisissant une taille de microbilles permettant d'obtenir le toucher soyeux voulu, il est nécessaire ensuite de choisir un taux de liant supérieur ou égal à 40 % pour avoir un poudrage correct et supérieur ou égal à 200 % pour avoir un maculage correct. En effet, le poudrage est jugé satisfaisant en dessous de 2 et le maculage en dessous de 0, 1.The results of the tests for Examples 1 to 5 are presented in Table 1. It can be seen that, even if most of the papers have a fairly satisfactory response to smudging and dusting tests, only microbead sizes of less than 10 micrometers allow to obtain an acceptable silky touch. The results of the tests for Examples 6 to 13 allow to conclude that by choosing a size of microbeads allowing to obtain the desired silky feel, it is then necessary to choose a binder content greater than or equal to 40% in order to have a powdering correct and greater than or equal to 200% for correct smearing. Indeed, the dusting is considered satisfactory below 2 and the smudging below 0, 1.
On a représenté sur les figures 1 et 2 une vue au Microscope Electronique à Balayage d'un papier présentant du point de vue de la demanderesse un toucher soyeux.There is shown in Figures 1 and 2 a view to a scanning electron microscope of a paper having from the point of view of the applicant a silky touch.
Ce papier a été obtenu en déposant sur un papier support CONQUEROR CX 22 ayant un grammage de 100 g/m la composition de couche suivante sur ces deux faces :This paper was obtained by depositing on a CONQUEROR CX 22 support paper having a grammage of 100 g / m the following layer composition on these two faces:
2,8 kg d'eau, 0,03 kg d'agent mouillant TEXAPON Z95P,2.8 kg of water, 0.03 kg of TEXAPON Z95P wetting agent,
81 kg de liant ROLFLEX PAD commercialisé par LAMBERTI, 6,1 kg de microbilles de polyurethane DAIPLACOAT RHU 5070 commercialisé par PROMECOME,81 kg of ROLFLEX PAD binder marketed by LAMBERTI, 6.1 kg of polyurethane microbeads DAIPLACOAT RHU 5070 marketed by PROMECOME,
1 kg d'un épaississant CMC BLANOSE 7M65 à 2,5 % commercialisé par AQUALON, à raison de 5,4 g/m en poids sec par face, les quantités étant exprimées en poids commercial.1 kg of a 2.5% CMC BLANOSE 7M65 thickener sold by AQUALON, at a rate of 5.4 g / m dry weight per side, the quantities being expressed in commercial weight.
Le papier obtenu a été ensuite calandre.The paper obtained was then calendered.
Les photographies représentent respectivement une vue de dessus grossie 200 fois et une vue en coupe grossie 2000 fois.The photographs respectively represent a top view magnified 200 times and a section view magnified 2000 times.
Le papier obtenu présente effectivement un toucher soyeux sur ces deux faces. En mesurant le coefficient de frottement dynamique du papier couché sur lui- même selon la norme NF-Q-03-082 avec un patin de 200 g, on obtient une valeur de 0,8 susceptible d'assurer une bonne machinabilité des feuilles sur les machines d'impression ou de transformation. The paper obtained actually has a silky feel on these two sides. By measuring the dynamic friction coefficient of the paper coated on itself according to standard NF-Q-03-082 with a pad of 200 g, we obtain a value of 0.8 capable of ensuring good machinability of the sheets on the printing or converting machines.
Figure imgf000010_0001
Figure imgf000010_0001
Tableau n°lTable n ° l
Figure imgf000010_0002
Figure imgf000010_0002
Tableau n°2 Table 2

Claims

REVENDICATIONS
1) Composition de couchage pour papiers couchés destinés à être imprimés en offset comprenant des pigments et un liant, caractérisée en ce que les pigments de couchage sont des microbilles de polyurethane possédant une taille inférieure à 10 micromètres, et, de manière avantageuse, proche de 7 micromètres.1) Coating composition for coated papers intended for offset printing comprising pigments and a binder, characterized in that the coating pigments are polyurethane microbeads having a size of less than 10 micrometers, and, advantageously, close to 7 micrometers.
2) Composition de couchage selon la revendication 1, caractérisée en ce que le liant utilisé est une émulsion aqueuse de polyurethane, possédant de préférence un taux d'élongation supérieur ou égal à 500 %.2) coating composition according to claim 1, characterized in that the binder used is an aqueous polyurethane emulsion, preferably having an elongation rate greater than or equal to 500%.
3) Composition de couchage selon la revendication 2, caractérisée en ce que le taux de liant par rapport aux pigments est supérieur ou égal à 403) coating composition according to claim 2, characterized in that the level of binder relative to the pigments is greater than or equal to 40
% en poids, et de préférence supérieur ou égal à 200 %.% by weight, and preferably greater than or equal to 200%.
4) Papier possédant un toucher soyeux, comportant au moins une face enduite d'une composition de couchage selon l'une des revendications précédentes, et de manière avantageuse ces deux faces.4) Paper having a silky feel, comprising at least one side coated with a coating composition according to one of the preceding claims, and advantageously these two faces.
5) Papier selon la revendication précédente, caractérisé en ce que le coefficient de frottement dynamique entre la face recto couchée et l'autre face verso également couchée de ce papier est inférieur ou égal à 1,0, mesure faite selon la norme NF-Q-03-082 avec un patin de 200 g.5) Paper according to the preceding claim, characterized in that the dynamic coefficient of friction between the front side coated and the other back side also coated with this paper is less than or equal to 1.0, measurement made according to standard NF-Q -03-082 with a 200 g pad.
6) Papier selon l'une des revendications 4 ou 5, caractérisé en ce que le poids de la couche appliquée sur au moins une face est compris entre 2 et 10 g/m en poids sec, et de préférence compris entre 3 et 6 g/m2. ) Papier selon l'une des revendications 4 à 6, caractérisé en ce qu'il constitue un papier calque, en particulier obtenu par un raffinage poussé des fibres de cellulose le composant. 6) Paper according to one of claims 4 or 5, characterized in that the weight of the layer applied to at least one face is between 2 and 10 g / m dry weight, and preferably between 3 and 6 g / m 2 . ) Paper according to one of claims 4 to 6, characterized in that it constitutes a tracing paper, in particular obtained by a thorough refining of the cellulose fibers composing it.
PCT/FR2002/004378 2001-12-18 2002-12-17 Coated paper with silky feel WO2003052203A2 (en)

Priority Applications (14)

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NZ533961A NZ533961A (en) 2001-12-18 2002-12-17 Coated paper with silky feel
HU0600861A HUP0600861A2 (en) 2001-12-18 2002-12-17 Coated paper with silky feel
BRPI0207323-4A BR0207323B1 (en) 2001-12-18 2002-12-17 Coating composition for coated papers and coated paper having a silky feel.
CA2469016A CA2469016C (en) 2001-12-18 2002-12-17 Coated paper with silky feel
AU2002364844A AU2002364844B2 (en) 2001-12-18 2002-12-17 Coated paper with silky feel
AT02801137T ATE526455T1 (en) 2001-12-18 2002-12-17 COATED PAPER WITH A SOFT IMPRESSION
JP2003553068A JP4669223B2 (en) 2001-12-18 2002-12-17 Coated paper with silk feel
EP02801137A EP1458930B1 (en) 2001-12-18 2002-12-17 Coated paper having a silky tactile impression
KR1020047009271A KR100956864B1 (en) 2001-12-18 2002-12-17 Coated paper with silky feel
US10/498,066 US20050031851A1 (en) 2001-12-18 2002-12-17 Coated paper possessing silky feel
MXPA04005869A MXPA04005869A (en) 2001-12-18 2002-12-17 Coated paper with silky feel.
NO20033545A NO20033545D0 (en) 2001-12-18 2003-08-11 Coated paper with silk-like grip
ZA2003/06262A ZA200306262B (en) 2001-12-18 2003-08-13 Coated paper with silky feel
HK05108237A HK1076133A1 (en) 2001-12-18 2005-09-20 Coated paper with silky feel

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FR01/16417 2001-12-18
FR0116417A FR2833625B1 (en) 2001-12-18 2001-12-18 COATING PAPER HAVING A SILKY TOUCH

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