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)

Priority Applications (14)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (2)

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• 2001
  • 2001-12-18 FR FR0116417A patent/FR2833625B1/fr not_active Expired - Fee Related
• 2002
  • 2002-12-17 CN CNB028253558A patent/CN100347375C/zh not_active Expired - Fee Related
  • 2002-12-17 RU RU2004121956/12A patent/RU2294998C2/ru not_active IP Right Cessation
  • 2002-12-17 CA CA2469016A patent/CA2469016C/fr not_active Expired - Fee Related
  • 2002-12-17 MX MXPA04005869A patent/MXPA04005869A/es active IP Right Grant
  • 2002-12-17 KR KR1020047009271A patent/KR100956864B1/ko not_active IP Right Cessation
  • 2002-12-17 KR KR1020087026912A patent/KR20080107481A/ko not_active Application Discontinuation
  • 2002-12-17 AU AU2002364844A patent/AU2002364844B2/en not_active Ceased
  • 2002-12-17 BR BRPI0207323-4A patent/BR0207323B1/pt not_active IP Right Cessation
  • 2002-12-17 EP EP02801137A patent/EP1458930B1/fr not_active Expired - Lifetime
  • 2002-12-17 HU HU0600861A patent/HUP0600861A2/hu unknown
  • 2002-12-17 NZ NZ533961A patent/NZ533961A/en not_active IP Right Cessation
  • 2002-12-17 ES ES02801137T patent/ES2372815T3/es not_active Expired - Lifetime
  • 2002-12-17 US US10/498,066 patent/US20050031851A1/en not_active Abandoned
  • 2002-12-17 WO PCT/FR2002/004378 patent/WO2003052203A2/fr active Application Filing
  • 2002-12-17 JP JP2003553068A patent/JP4669223B2/ja not_active Expired - Fee Related
  • 2002-12-17 PT PT02801137T patent/PT1458930E/pt unknown
  • 2002-12-17 AT AT02801137T patent/ATE526455T1/de not_active IP Right Cessation
• 2003
  • 2003-08-11 NO NO20033545A patent/NO20033545D0/no not_active Application Discontinuation
  • 2003-08-13 ZA ZA2003/06262A patent/ZA200306262B/en unknown
• 2005
  • 2005-09-20 HK HK05108237A patent/HK1076133A1/xx not_active IP Right Cessation

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