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
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
  • D21H17/57—Polyureas; Polyurethanes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • B41M5/5281—Polyurethanes or polyureas
• • 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
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
  • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
  • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
• • 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
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
• • 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
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
  • Y10T428/249971—Preformed hollow element-containing
  • Y10T428/249974—Metal- or silicon-containing element
• • 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 coated fine paper writing, packaging and / or printing, in particular offset, and its method of preparation.
• papers can be distinguished by their use, each use corresponding to customers having a particular type of printer and corresponding to a specific market.
• a customer of the paper industry therefore chooses among the various papers offered one that is printable with the type of printer he wants to use and that best meets his needs in terms of quality and cost.
• printer or printing There are several types of printer or printing including desk top inkjet, continuous inkjet, black-white offset (eg for newspaper printing), offset 4 color (four-color process), digital offset, thermal offset, electrophotography (photocopier, laser printer), rotogravure, screen printing, and sublimation.
• inks used for printing a paper depend on the type of printing.
• Inks for inkjet printing include volatile solvents or water as the vehicle, while inks for offset printing use vegetable oils or petroleum distillates as the vehicle.
• coated paper For 4-color offset printing, two types of paper can be used: coated paper and fine paper.
• a coated paper comprises a conventional paper on which is deposited a layer comprising a binder and pigments. The fibers of the paper are then masked by the layer so that they are no longer visible.
• the paper serves only as a support for the layer that is designed to give the coated paper a very good quality printing. The coated paper of the coated paper is therefore not visible in the final product and may be of relatively low quality.
• a coated paper has a low value hand (generally less than 1.04 cm 3 / g, and the pulp used for its manufacture comprises cellulosic fibers of more or less good quality, a binder, and a relatively large amount of fillers (generally greater than 15% by dry weight relative to the total dry weight of the paper).
• the pigmented layer is generally deposited on the support paper at a rate of 18 to 35 g / m 2 per side, by a smoothing coating technique such as the blade, which gives the coated paper a dish which masks the imperfections of the paper such as that the epair and the roughness brought by the fibrous mat of the support paper.
• the production of a coated paper is made at low cost with machines of several meters in width ranging from sheet speeds to winding typically greater than 1000m / min.
• the paper first receives a primer which is a first generally pigmented coating layer which is deposited in line at a rate of a few g / m 2 , receives the aforementioned pigmented layer defining the printability of the final product, and is calendered into end of line.
• a fine paper is a precious or quality paper which differs from a conventional paper or support used for the preparation of a coated paper, in particular by its hand, the composition of the paper pulp which is used for its manufacture, and its manufacturing cost which is higher. Fine paper is generally marked or naturally textured due to the manufacturing process employed and / or by a treatment applied to it, such as graining.
• a fine paper has a hand greater than or equal to 1.10 3 / g, and the paper pulp which is used for its manufacture comprises good quality cellulosic fibers, a binder, and a low proportion of fillers and / or adjuvants, such as starch.
• An important characteristic of a thin paper is its printability, and in particular the drying time of the inks used for its printing. When a thin paper is printed for example by an offset printing process, it is important that the drying time of the inks used is relatively short so that the inks deposited on the front of a thin paper do not stain by the reverse side. another thin paper when stacked on top of one another, or that same thin paper when it is rolled up on itself.
• Fine papers used in 4-color offset printing are mostly untreated.
• the inks are deposited directly on the fibers which are only coated with usual adjuvants.
• the paper has no pigments on the surface and the fibers of the paper are apparent and are clearly distinguishable after printing.
• the eucalyptus fibers of a fine paper are visible to the naked eye by forming small glossy dots on the surface of the fine paper.
• the visible textured appearance of the fine paper gives a relief to the printed surface and results in a final impression after printing of the very aesthetic fine paper, which is appreciated by the customers.
• Another significant difference between a thin paper and a coated paper is that when a coated paper has a certain surface roughness, it is due to the layer deposited on the paper, while the surface roughness of a paper end is mainly due to its own texture.
• a thin paper is indeed in general textured or marked, its texture may be natural and / or forced, that is to say in this case obtained by a graining process or marking or by a similar process.
• the graining of a thin paper can be carried out during the manufacture of the paper (for example by means of, for example, an adequate drip cloth of the paper pulp or embossing or marking rolls) or after it.
• a grained fine paper comprises recessed and / or raised patterns on at least one of its faces, giving for example to the final product after printing textures such as curved lines or geometric figures.
• a coated paper has a smooth surface that does not show the fibrous mat or a marking of the support by an element of the manufacturing process.
• the fine paper can be laid and include shepherds made for example by means of a watermarking roll.
• the fine papers of the current art suffer from a relatively low print quality, in particular because the drying time of the inks used is very long.
• the fibers of the fine paper do not fix enough printing inks and therefore do not allow the inks to dry quickly.
• the dishes are not uniform because they depend on the fibrous mat of fine paper which, by its very structure, is not uniform.
• a coating composition comprising pigments and a binder is then deposited at a rate of 8 to 16 g / m 2 on one side of the thin paper to improve its printability.
• coating compositions used in the present art are unsatisfactory in particular because they modify the properties of fine papers coated with these compositions, and in particular their hand or mechanical strength and their feel.
• the mechanical strength of paper is an important feature for thin paper.
• the finer the fine paper the greater the mechanical strength, and the higher the quality of the fine paper felt by a customer holding the paper in his hands.
• Touch is also an important feature of thin paper. Indeed, the purpose of a thin paper is usually to be held by the hands of a client to convey information in written form or printed or carry an object as part of a package. By physical contact with the client's hands, sensory information is added to the written message or to the apprehension of the packaged object, to form a global perception of the object.
• a thin paper usually made of short fibers of cellulose, has the particularity of being soft to the touch.
• a fine paper made of cotton fibers is also very soft. This softness may vary somewhat depending on the fibrous composition of the paper, the amount of fillers used in the paper and the final roughness of the paper. Nevertheless, fine papers have the particularity of presenting a soft surface particularly pleasant to the touch.
• fine paper coated with a pigment composition of the present art has a softer (rougher) feel than the same fine paper before coating.
• the removal, even in small quantities, of a coating composition of the current technique on a thin paper modifies the feel of this paper, which becomes rougher, in particular because of the presence of the pigments in the coating composition.
• the present invention overcomes this problem by means of a coating composition for fine paper which gives this paper a softness close to that of the paper before coating. It also aims to improve the printability of a thin paper, especially offset printing, while preserving its texture.
• a thin paper for writing, packaging and / or printing, in particular offset comprising a fibrous mat having a hand greater than or equal to 1.10 cm 3 / g and at least one layer whose dry deposit on one or each face of the fibrous mat is between 3 and 10 g / m 2 and which comprises:
• the coated fine paper has a similar feel to that of the fibrous mat.
• the fine paper according to the invention has a hand greater than or equal to 1.10 cm 3 / g, preferably greater than 1.2 cm 3 / g, and for example greater than 1.25 cm 3 / g. It has a thickness of between 0.1 and 0.5 mm for example, and preferably between 0.15 and 0.35 mm, and / or a grammage of between 100 and 300 g / m 2 , and preferably between 120 and 240 g / m 2 .
• the hand of a thin paper is obtained by the ratio of its thickness on its grammage.
• the fibrous mat of the fine paper according to the invention is preferably formed of cellulose fibers, a binder, and fillers the amount of which is less than 22%, and preferably less than 15%, by dry weight relative to total dry weight of the paper. It can also be textured in a natural way and / or forced by a method of the aforementioned type, and include patterns in relief and / or hollow, the aforementioned layer does not change or little that texture on said face. These patterns generally have dimensions of at least several tens of microns.
• the depositing of the coating composition on the or each face of the fibrous mat is relatively low (between 3 and 10 g / m 2 , preferably between 5 and 7 g / m 2 , and more preferably of the order of 5 or 6 g / m 2 2 ) not to mask the texture of the paper and have a small influence on his hand, and thus retain the tactile, visual and mechanical properties of the original fibrous mat.
• the coated fine paper has an appearance, a touch and a brightness close to those of the original fibrous mat.
• the fine paper according to the invention has good printing uniformity (due to the absence of marbling or "mottling").
• the presence of inorganic pigments in the coating composition makes it possible to improve the printability of the fine paper, notably by accelerating the drying time of the inks used during printing.
• the inorganic pigments are preferably present (in terms of weight) in the deposited layer. They may represent more than 50% by weight, preferably between 60 and 95% by weight, more preferably between 70 and 90% by weight, and for example between 80 and 90% by weight, of the deposited layer. They may be deposited at a rate of 2 to 9 g / m 2 , preferably 4 to 8 g / m 2 , and more preferably 4 to 7 g / m 2 , on the fibrous mat.
• the binder of the or each layer is a latex, for example based on styrene-butadiene copolymer (s) and / or styrene-acrylic copolymer (s).
• the or each layer may comprise a quantity of latex of between 1 and 10% by dry weight relative to the total dry weight of this layer.
• the aqueous polyurethane dispersion gives the fine paper the desired soft feel, which is similar to that of this fine paper before coating.
• the amount of this dispersion in the layer is relatively small (0.5 to 8%, preferably 1 to 6%, and more preferably 1 to 5%, by dry weight relative to the total dry weight of pigment (s) in this layer) because too much of this dispersion would give this layer a sticky surface.
• the polyurethane used in the or each layer may be composed of diisocyanate and polyether. It is advantageously nonionic in order to facilitate its mixing with the other constituents of this layer. It preferably has a glass transition temperature below -40 ° C, for example of the order of -55 ° C, so as to have a soft consistency at room temperature.
• the aqueous dispersion of nonionic polyurethane marketed by LAMBERTI under the trademark ESACOTE PAD® may be used to prepare the fine paper according to the invention.
• the degree of gloss of the or each coated surface of the fine paper according to the invention may be between 2 and 7% and preferably between 3 and 6%. It is for example less than 6%.
• the degree of gloss of the or each coated side of the fine paper after printing can be between 4 and 12%, and preferably between 6 and 9%. It is for example less than 8%.
• the degree of gloss of the fine paper is measured at 75 ° according to the Tappi®T480 standard, the printing ink used being a 100% black ink (such as the ink: K + E® NOVAVIT® "Supreme Bio” series ").
• the or each layer comprises calcium carbonate and / or kaolin.
• Calcium carbonate has the advantage of being relatively cheap and of bringing whiteness to fine paper.
• Calcium carbonate is preferably the majority pigment in the layer.
• the or each layer may comprise 50 to 95%, preferably 60 to 90%, and more preferably 60 to 70%, by dry weight of calcium carbonate relative to the total dry weight of pigments of this layer.
• Calcium carbonate marketed by the company IMERYS under the CARBITAL® brand may be used to prepare the fine paper according to the invention.
• the or each layer may further comprise talc and / or porous amorphous silica.
• Talc has the advantage of being soft to the touch and improving the feel of fine coated paper.
• the or each layer may comprise 5 to 50%, preferably 15 to 40%, and more preferably 20 to 30% by dry weight of talc relative to the total dry weight of pigments of this layer.
• the amount of talc in the or each layer is relatively low because too much, for example greater than 50%, reduce the whiteness of the layer and make it too bright.
• the talc particles preferably have a size of between 1 and 5 ⁇ m.
• Talc marketed by MONDO MINERALS under the trademark FINNTALC® can be used to prepare the fine paper according to the invention.
• the or each layer may comprise from 1 to 15%, preferably from 4 to 12%, and more preferably from 6 to 10%, by dry weight of porous amorphous silica relative to the total dry weight of pigments of this layer.
• Silica makes it possible to reduce the drying time of the inks during printing, in particular offset, and to give the coated fine paper a gloss similar to that of uncoated fine paper.
• the silica marketed by GRACE under the trademark SYLOID® may be used to prepare the fine paper according to the invention.
• the or each layer may further comprise at least one dye, and / or at least one optical brightener, and / or at least one wax, and / or starch, and / or at least one polyvinyl alcohol (as binder), and / or at least one crosslinker, and / or at least one thickener, and / or calcium stearate.
• at least one dye and / or at least one optical brightener, and / or at least one wax, and / or starch, and / or at least one polyvinyl alcohol (as binder), and / or at least one crosslinker, and / or at least one thickener, and / or calcium stearate.
• the layer may comprise a quantity of crosslinking agent of between 0.2 and 0.6%, preferably between 0.3 and 0.5%, and for example of the order of 0.4%, by dry weight relative to total dry weight of the layer.
• the crosslinking agent can be used to crosslink the latex and / or the polyvinyl alcohol and thus improve the resistance of the layer, in particular to water.
• the layer may comprise an amount of polyvinyl alcohol of between 1 and 10%, preferably between 3 and 8%, and for example between 4 and 6% by dry weight relative to the total dry weight of the layer. It may comprise a quantity of thickener of between 0.8 and 1.2%, and preferably of the order of 0.8-1% by dry weight relative to the total dry weight of the layer. This thickener may be carboxyl methyl cellulose. It may comprise between 0.3 to 3%, and preferably between 1 and 2%, calcium stearate by dry weight relative to the total dry weight of pigments of the layer.
• the paper comprises a layer according to the invention on each of its faces and is therefore of the symmetrical type.
• the fine paper according to the invention preferably comprises at least one layer comprising:
• the or each layer may comprise between 20 and 30% by dry weight of talc relative to the total dry weight of pigments of this layer.
• the or each layer comprises at least 90% by dry weight of calcium carbonate relative to the total dry weight of pigments of this layer.
• the coated fine paper according to the invention can have a Bendtsen roughness of between 50 and 400 ml / min. This roughness is preferably greater than 100 ml / min and / or less than or equal to 200 ml / min.
• the present invention also relates to a method for preparing a thin paper as described above, characterized in that it comprises a step of depositing the or each layer on the fibrous mat by curtain coating, with the blade of air, or by means of a Meyer bar.
• Thin paper can be calendered after coating.
• the curtain and air knife coating techniques do not smooth the thin paper but simply deposit the diaper on the paper end, this layer following the texture of the fine paper.
• the layer deposited by these techniques has a more uniform thickness and the outer surface of the layer is less flat and therefore more marked, which contributes in particular to the final rendering after printing.
• Fine coated papers were prepared from Conqueror Velin® fine papers marketed by the applicant. A coating composition was deposited on one side of each fine paper, and the resulting coated fine papers were then tested for their feel as well as the drying time of the inks after printing. The table below shows the composition of these fine coated papers and the results obtained from these tests.
• the gloss of an uncoated paper (fibrous mat) Conqueror Velin® is between 5 and 7%.
• the gloss of this paper after printing (with a printing ink 100% black ink, density 1, 5, such as ink: K + E® NOVAVIT® series "Supreme Bio") is between 6 and 9%.
• the dynamic coefficient of friction of each side of the fine paper was measured according to standard NF-Q-03-082 with a pad of 200 g, and is 0.86.
• Examples 1 to 4 relate to coated fine papers not related to the invention.
• the layer deposited on the fine paper in each of these examples comprises as calcium pigments calcium carbonates (mostly) and porous amorphous silica.
• Each layer comprises a latex as a binder, polyvinyl alcohol, a crosslinking agent and a thickener.
• the layers of Examples 1 to 4 are free of an aqueous polyurethane dispersion and include a wax for improving the slippage of fine papers in forming machines.
• the amount of layer deposited on one side of each fine paper is 5 g / m 2 .
• the coating of the fine papers in Examples 1 to 4 causes an increase in their roughness, and this significantly in the case of Examples 3 and 4 (increase greater than or equal to 70 ml / min after coating).
• the Bekk smoothness of the fine papers decreased relatively significantly after coating (from 24 to 18s in the case of Example 1), which reflects an increase in the roughness of these fine papers.
• the relatively large increase in the roughness of the fine papers after coating in the case of Examples 1 to 4 (illustrated by the increase in their roughness Bendtsen or the decrease in their smoothness Bekk) reflects a change in their feel.
• Examples 5 to 8 relate to coated fine papers according to the invention.
• the layers deposited on the fine papers include as calcium mineral pigments and porous amorphous silica in Examples 5 and 6, and further talc in Examples 7 and 8.
• the layers of Examples 5 and 6 comprise a latex as a binder, polyvinyl alcohol, a crosslinking agent, a thickener, and an aqueous polyurethane dispersion.
• the layers of Examples 7 and 8 further comprise calcium stearate.
• the amount of layer deposited on one side of each fine paper is 5 or 6 g / m 2 in Examples 5 to 8.
• Example 7 The presence of the aqueous polyurethane dispersion in the pigment layers gives the coated fine papers of Examples 5 to 8 a soft feel very similar to that of the original fine papers. Moreover, the 4-color offset printing of these coated fine papers is of good quality in the case of Examples 7 and 8.
• the dynamic coefficient of friction of the coated fine paper in Example 7 is 0.67 (measured according to standard NF-Q-03-082 with a 200g pad).
• the Bendtsen roughness of the fine papers of Examples 5 to 8 is not or is slightly modified after coating (increase of at most 1 ml / min in Example 8, or decrease after coating).
• the Bekk smoothness of these papers decreased slightly after coating in the case of Examples 5 and 6 and even increased in the case of Examples 7 and 8. This increase in Bekk smoothness in the case of Examples 7 and 8 could explain by the sleeping technique used, which is the air space.
• the slight differences in the roughness or smoothness of the fine papers before and after coating in Examples 5 to 8 mean that the coated papers are similar in feel to the original fibrous mattresses.
• Example 9 relates to a coated fine paper outside the invention.
• the layer deposited on the fine paper does not comprise an aqueous dispersion of polyurethane, and the coated fine paper has a different feel from the base fine paper (which is illustrated by a significant increase in its Bendtsen roughness of 52 ml / min).
• the coated fine papers according to the invention have a Bendtsen roughness and a Bekk smoothness close to those of thin paper or uncoated fibrous mat and thus retain their original soft touch.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)

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• 2010
  • 2010-06-03 FR FR1054343A patent/FR2960889B1/fr not_active Expired - Fee Related
• 2011
  • 2011-05-27 JP JP2013512974A patent/JP2013527340A/ja not_active Withdrawn
  • 2011-05-27 EP EP11726920.9A patent/EP2576904A1/fr not_active Withdrawn
  • 2011-05-27 US US13/701,650 patent/US20130157021A1/en not_active Abandoned
  • 2011-05-27 CA CA 2804326 patent/CA2804326A1/fr not_active Abandoned
  • 2011-05-27 WO PCT/FR2011/051226 patent/WO2011151581A1/fr active Application Filing
  • 2011-05-27 KR KR1020137000166A patent/KR20130096694A/ko not_active Application Discontinuation
  • 2011-05-27 CN CN2011800380255A patent/CN103052749A/zh active Pending
  • 2011-05-27 BR BR112012030421A patent/BR112012030421A2/pt not_active Application Discontinuation

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