EP1792009A2 - Procédé de fabrication de substrats enduits une ou plusieurs fois à l'aide d'une composition d'enduit colorée contenant un liant à fort pouvoir d'adhérence - Google Patents

Procédé de fabrication de substrats enduits une ou plusieurs fois à l'aide d'une composition d'enduit colorée contenant un liant à fort pouvoir d'adhérence

Info

Publication number
EP1792009A2
EP1792009A2 EP05787450A EP05787450A EP1792009A2 EP 1792009 A2 EP1792009 A2 EP 1792009A2 EP 05787450 A EP05787450 A EP 05787450A EP 05787450 A EP05787450 A EP 05787450A EP 1792009 A2 EP1792009 A2 EP 1792009A2
Authority
EP
European Patent Office
Prior art keywords
styrene
coating composition
binder
butadiene
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05787450A
Other languages
German (de)
English (en)
Inventor
Erich Krumbacher
Oliver Birkert
Martin Schachtl
Christoph Hamers
Martin Tietz
Uwe Froehlich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP1792009A2 publication Critical patent/EP1792009A2/fr
Withdrawn legal-status Critical Current

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
    • 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
    • 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
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper
    • 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
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31931—Polyene monomer-containing
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31935—Ester, halide or nitrile of addition polymer

Definitions

  • the invention relates to a process for the production of single and / or multi-coated substrates, such as paper or cardboard, excluding photographic papers and self-adhesive label papers, which are especially suitable for printing, packaging and labeling, wherein the substrate is coated in particular with one or more free-falling liquid curtains, wherein the free-falling liquid curtains are formed by a coating composition comprising a binder having a particularly high binding force.
  • curtain coating is a well known process for coating substrates.
  • the emulsions or liquids used so far as coating have a low solids content and a low viscosity;
  • the speed of application is very low, which is currently below 600 m / min.
  • graphic papers in contrast to the suspensions used in the photographic industry, pigmented suspensions with a high solids content are obtained and high viscosities used.
  • graphic papers are mostly produced by blade coating or film presses at speeds significantly above 1000 m / min.
  • Both the blade application method and the film press application method each have specific disadvantages that affect the quality of the resulting coated substrates, such as base paper or paperboard.
  • the aggregation of particles, induced by the high shear rates under the blade can lead to streaks on the paper coating which worsen the paper or board surface quality obtained.
  • the coating colors used in the graphic arts industry require the blade to be strong enough to require frequent replacement to ensure consistent line quality.
  • the line distribution on the paper or board surface is influenced by the unevenness of the substrate.
  • the film press application method hitherto used for the production of graphic papers requires a narrowly dimensioned operation window, which is essentially determined by the factors substrate surface property, substrate porosity (Wegschlag ⁇ behavior) and coating color solid content.
  • This narrow operating window is for each web speed, i. for each job speed and for each stroke weight.
  • Non-optimized coating color receptors used in the film press application process can result in an uneven film splitting pattern on the surface of the substrate, be it paper or cardboard, which in turn has poor printability.
  • small drops can dissolve when painted and thus lead to quality losses.
  • the maximum achievable application weight by means of the film application method is significantly lower. This limitation of the maximum coating weight is particularly pronounced at high application speeds.
  • both of the outlined methods of application both the film press application method and the blade application method, suffer from the disadvantage that the application weight is distributed unevenly between ridges and valleys (mountains and valleys) which has the surface of the paper substrate, so that the ink acceptance is also uneven spread, which can lead to the above-mentioned Mottling effect (cloudiness of the pressure).
  • both methods provide a relatively high application speed, well above 600 m / min, both the film press application method and the blade application method are very widely used in the production of graphic papers.
  • JP 94-89437, JP 93-311931 JP 03-177816, JP 93-131718, JP 92-298683, JP 92-51933, JP 01-298229, JP 90-217327, JP 8-310110 and EP-A 517 223 and EP-A 1 249 533 already disclose the Use of the existing coating method to coat a substrate with one or more pigmented coating colors.
  • a curtain coating method is disadvantageous because at elevated application speeds and low application weights the applied liquid tends to instability. Added to this is the fact that when coating the coating composition applied by curtain coating on the surface of the paper substrate, the coating color is deflected from the free fall by approximately 90 ° and thereby accelerated to the substrate speed, which is too local very high shear and strain rates in the coating fluid. The fluid can be stressed too much in extreme cases that tearing of the film may occur due to cavitation bubbles. The risk of rupture of the applied coating color curtain increases with increasing speed of the substrate and represents the upper operating limit for the curtain application method.
  • a coating composition which can be applied by curtain coating is added to a styrene-butadiene based binder.
  • the binder is selected on the basis of styrene-butadiene latex binder, styrene-acrylate latex binder, styrene-butadiene-acrylonitrile latex binder, styrene-maleic acid hydride binder and styrene-acrylate maleic anhydride binder having a particle size ⁇ 130 nm.
  • Synthetic polymers are, of course, suitable as binders admixed with the coating composition according to the invention.
  • Starch may be mentioned as the natural polymer, and synthetic polymers are, in particular, those polymers which are obtained by free-radical polymerization of ethylenically unsaturated compounds (monomers).
  • the binder is preferably a polymer which consists of at least 40% by weight, preferably at least 60% by weight, and particularly preferably at least 80% by weight, of main monomers.
  • the main monomers are selected from C 1 -C 20 -alkyl (meth) acrylates, vinyl esters of carboxylic acids containing up to 20 carbon atoms, vinylaromatics having up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of 1 alcohols containing up to 10 carbon atoms, aliphatic hydrocarbon having 2 to 8 carbon atoms and one or two double bonds or mixtures of these monomers.
  • alkyl (meth) acrylates having a C 1 -C 6 -alkyl radical such as methyl methacrylate, methyl acrylate, n-butyl acrylate, ethyl acrylate and 2-ethylhexyl acrylate.
  • (meth) acrylic acid alkyl esters may also be suitable.
  • vinyl esters of carboxylic acids having 1 to 20 carbon atoms for example vinyl laurate, vinyl stearate, vinyl propionate, versatic acid vinylester and vinyl acetate.
  • Suitable vinylaromatic compounds are vinyltoluene, ⁇ - and p-methylstyrene, ⁇ -butylstyrene, 4-n-butylstyrene, 4-n-decylstyrene and preferably styrene.
  • nitriles mention may be made of acrylonitrile and methacrylonitrile.
  • Vinyl halides are ethylenically saturated compounds substituted by chlorine, fluorine or bromine, vinyl chlorite and vinylidene chloride in particular being mentioned.
  • vinyl ethers mention may be made of e.g. Vinyl ethyl ether and vinyl isobutyl ether. Preference is given to using vinyl ethers containing alcohols having from 1 to 4 carbon atoms.
  • Suitable hydrocarbons having 2 to 8 carbon atoms and one or two olefinic double bonds are ethylene-propylene butadiene isopropene and chloropropene.
  • Preferred principal monomers are C 1 -C 1 o-alkyl (meth) acrylates and mixtures of the alkyl (meth) acrylates with vinyl aromatics, particularly styrene or hydrocarbons with double bonds, especially butadiene or mixtures of such hydrocar- sererstoffen with vinylaromatics, in particular styrene.
  • the ratio may be, for example, between 10:90 to 90:10, in particular 20:80 to 80:20.
  • Preferred main monomers are butadiene and the above mixtures of butadiene and styrene (polystyrene butadiene for short) or C 1 -C 10 -alkyl (meth) acrylates or mixtures thereof with styrene (polyacrylates for short).
  • the polymer may contain other monomers, e.g. Monomers with carboxylic acid, sulfonic acid or phosphonic acid groups. Preferably, carboxylic acid groups are used. Called e.g. Acrylic acid, methacrylic acid, itaconic acid, maleic acid or fumaric acid. The content of ethylenically unsaturated acids in the emulsion polymer is generally less than 5 wt .-%.
  • monomers are, for example, hydroxyl containing monomers, in particular C 1 - C 1 o-hydroxyalkyl (meth) acrylates and (meth) acrylamide.
  • the preparation of the polymers is carried out according to a preferred embodiment by emulsion polymerization, therefore, it is an emulsion polymer.
  • the preparation can also be carried out by solution polymerization and subsequent dispersion in water.
  • ionic and / or nonionic emulsifiers and / or protective colloids or stabilizers are used as surface-active compounds.
  • the surfactant is usually used in amounts of 0.1 to 10 wt .-% based on the monomers to be polymerized.
  • Water-soluble initiators for the emulsion polymerization are two ammonium and alkali metal salts of peroxydisulphuric acid, e.g. Sodium peroxidisulfate peroxide or organic peroxides e.g. TERT-butyl hydroperoxide. Also suitable are so-called reduction-oxidation (redox) initiator systems.
  • the amount of initiators is generally 0.1 to 10%, preferably 0.5 to 5 wt .-% based on the monomers to be polymerized. It is also possible to use a plurality of different initiators in the emulsion polymerization. In the polymerization, it is possible to use regulators, for example in amounts of from 0 to 0.8 part by weight, based on 100 parts by weight of the monomers to be polymerized, which reduce the molecular weight.
  • Suitable compounds are, for example, compounds with a thiol group such as tert-butylmercaptan, thioglycolic acid ethylacrylic ester, mercaptoethynol, mercaptopropyltrimethoxylane or tert-dodecylmercaptan.
  • emulsion polymerization is generally carried out at 30 0 C to 130 0 C, preferably 50 0 C to 90 0 C.
  • the polymerization medium may be composed either of water alone or of mixtures of water and water-miscible liquids such as methanol. Preferably, however, only water is used.
  • the emulsion polymerization can be carried out both as a batch process and in the form of a feed process, including strig ⁇ or gradient mode.
  • the feed process in which part of the polymerization batch is initially introduced, is preferably heated to the polymerization temperature, then polymerized, and then the remainder of the polymerization batch, usually via a plurality of spatially separate feeds, one or more of the monomers or in emulsified form Containing form, continuously feeding stepwise or under siege of a concentration gradient while maintaining the polymerization of the polymerization.
  • the polymerization it is also possible, for example for the purpose of better adjustment of the particle size, to initially introduce a polymer.
  • the manner in which the initiator is added to the polymerization vessel in the course of the free-radical aqueous emulsion polymerization is known. It can be introduced either completely into the polymerization vessel or used continuously or in stages according to its consumption in the course of the free-radical aqueous emulsion polymerization. In detail, this depends on the chemical nature of the initiator system and on the polymerization temperature. Preferably, a part is initially charged and the remainder is fed in accordance with the consumer in the polymerization zone.
  • aqueous dispersions of the polymer are generally obtained with solids contents of from 15% by weight to 75% by weight, preferably from 40% by weight to 75% by weight.
  • the binder composition added to the coating composition based on styrene-butadiene latex binder, styrene-acrylate latex binder, styrene-butadiene-acrylonitrile-latex binder, styrene-maleic anhydride binder, styrene-acrylate maleic anhydride binder, polyvinyl acetate has a particle size of ⁇ 130 nm.
  • FIG. 1 shows a diagram which shows the dependence of the binding force on the particle size
  • Figure 2 shows the influence of the particle size of the binder on the color density after a defined period of time.
  • the coating composition (percentages and parts by weight) proposed according to the invention comprises a slurry of calcium carbonates CaCO 3 having a particle size of 2 ⁇ m, which makes up 95% of the slurry (for example Hydrocarb 95 ME available from OMYA, Oftringen, Switzerland) with a dry weight fraction of 77% and an Amazon Premium Clay Slurry with a particle size of 2 ⁇ m, which makes up 98% of the slurry (eg Amazon Premium available from Kaolin International) with a dry weight fraction of 74.6%.
  • a slurry of calcium carbonates CaCO 3 having a particle size of 2 ⁇ m which makes up 95% of the slurry (for example Hydrocarb 95 ME available from OMYA, Oftringen, Switzerland) with a dry weight fraction of 77%
  • an Amazon Premium Clay Slurry with a particle size of 2 ⁇ m, which makes up 98% of the slurry (eg Amazon Premium available from Kaolin International) with a dry weight fraction of 74.6%.
  • the coating composition is mixed with different binders A, B, C, D, E, F, G, H, I in the following examples.
  • Binder A was styrene-butadiene latex (Styronal D 536 from BASF AG) with a particle size of 130 nm, Tg 0 0 C and 50% in water. Tg was the glass transition temperature, the gel content was 83%.
  • Binder B was styrene-butadiene-acrylonitrile latex (Styronal D 627 from BASF AG) having a particle size of 140 nm, Tg 13 ° C., 50% in water. Tg indicated the glass transition temperature, the gel content was 80%.
  • the binder C used was styrene-butadiene latex (Styronal D 808 from BASF AG) with a particle size of 160 nm, Tg 22 ° C. and 50% in water.
  • Tg denoted the glass transition temperature
  • the gel content was 72%.
  • Styrene-butadiene latex having a particle size of 130 nm, Tg 0 0 C, 50% in water was used as a further binder, namely binder D, neutralized in sodium hydroxide solution.
  • Styrene-butadiene latex with a particle size of 165 nm was used as binder E, a Tg of 16 ° C., 50% in water. Tg denotes the glass transition temperature.
  • binder F Another binder, binder F, was prepared by styrene-butyl acrylate latex, which presented a particle size of 175 nm, a Tg of 20 0 C and 50% in water dar ⁇ .
  • Binder G Another binder, Binder G, was represented by styrene-butadiene latex, which had a particle size of 115 nm, a Tg O 0 C, a solids content of 50%, the gel content was 85%.
  • binder H Another binder, binder H, was represented by styrene-butadiene latex, which had a particle size of 100 nm, a Tg 0 0 C, a solids content of 50%, the gel content was 76%.
  • Another coating composition contained a binder I, namely styrene-butadiene-acrylonitrile latex having a particle size of 80 nm, glass transition temperature Tg of -12 ° C and 50% in water, the gel content being 86%.
  • a binder I namely styrene-butadiene-acrylonitrile latex having a particle size of 80 nm, glass transition temperature Tg of -12 ° C and 50% in water, the gel content being 86%.
  • compositions with the different binders A to I as additive A were a polyacrylamide thickener (composition 40 mol .-% acrylic acid, 60 mol .-% acrylamide, 44 million molecular weight Mn) added and a surfactant, namely an aqueous solution of Natriumdialkylsulphosuccinate (Lumiten I-DS 3525), available from BASF AG as well as an optical brightener such as Blancophor P available from Bayer AG, Leverkusen, added.
  • a polyacrylamide thickener composition 40 mol .-% acrylic acid, 60 mol .-% acrylamide, 44 million molecular weight Mn
  • a surfactant namely an aqueous solution of Natriumdialkylsulphosuccinate (Lumiten I-DS 3525), available from BASF AG as well as an optical brightener such as Blancophor P available from Bayer AG, Leverkusen, added.
  • the pH of the pigmented coating compositions was adjusted to 8.7 by addition of 10% NaOH.
  • Solids content Coating formulations were adjusted by dilution with water.
  • the formulations 1 to 9 of the coating color composition each differ from one another by the added binders A, B, C, D, E, F, G, H, I.
  • the Brookfield viscosity of Formulations 1-9 was measured using a Brookfield RVT Viscometer (available from Brookfield Engineering Laboratories, USA) at room temperature of 25 ° C. For the measurement, 600 ml of the dispersion were placed in a 1 1 beaker and the viscosity was measured at a spindle No. 4 at a conversion rate of 100 n -1 .
  • the coating composition according to Formulations 1 to 9 were coated on substrates according to the examples given below. The properties of the contained substrates, whether paper or cardboard, were determined by the following test protocols.
  • Paper gloss was measured at an angle of incidence of 75 ° according to DIN 54 502
  • Particle size The particle size of the dispersions was determined according to DEST ISO 13321.
  • the glass transition temperature of dispersion films was determined according to DIN ISO 53765.
  • the test device includes a MZ II Printability tester, a test-pattern inking roller, metal pressure discs each 40 mm wide, a dispenser with 0.01 ml can be dosed and another 0.001 ml dispenser can be dosed, as well as a long-run sample holder and a stopwatch ,
  • the ink used was Novavit 4F 713 Cyan (Kat & Ehinger). From the papers to be tested, samples having a size of 240 ml were cut out to 46 ml in the longitudinal direction. Samples were stored separately in a climate room for at least 15 hours prior to testing.
  • the device was switched on, wherein 0.3 ml of the printing ink was applied to one of the inking rollers and then a run of one minute took place. Then a pressure disk was inserted into a holder provided for this purpose and inked for 30 seconds. For each additional printing plate, 0.03 ml of the ink was applied to the inking roller, followed by a 30 second run before staining.
  • the colored inking roller can only be used for a certain period of time.
  • a strip of paper was stretched on a print sample carrier and placed in the channel all the way to the right printing unit.
  • the inked pressure disk was placed on the right-hand printing core and actuated by the operation of the Start button was the start of the printing process. If the coverage point was not reached with the above-listed amount of printing ink, the quantity of printing ink and its supplement of 0.4 and 0.04 ml or 0.5 and 0.05 ml had to be increased. Only when the cover point was reached with the paper strip, was the continuation of the test. The print sample carrier was brought to the starting position with the printed paper strip. Care must be taken that the strip is not touched with fingers or other objects. After a fixed period of time, generally 10 seconds, the printing process was restarted without replacing the pressure disk. This was repeated a total of five times.
  • the roughness of the coated substrates was determined by means of a Parker PrintSurf roughness tester. A sample of coated paper was clamped between a Cork-Melinex plate and a measuring head at a pressure of 1,000 kPa. Compres- sed air was applied to the substrate at a defined pressure of 400 kPa and then the leakage of the air between the measuring head and the paper surface was measured. High air leakage indicates high paper roughness of the coated substrate, be it paper or cardboard.
  • the coating weight of the coating material to be spread on the substrate, whether paper or cardboard, by means of the curtain coating method was determined by the volume flow of the coating curtain through a curtain coating die nozzle, the paper web speed, the density of the coating composition and the width of the coating determined substrate.
  • the coated substrates were then calendered with a Janus calender (Voith) under the following conditions:
  • a film having about 1 to 2 mm film thickness was cast. This film was dried at room temperature for 72 hours. Then, 3 squares of 1 cm side length were cut out from the obtained film and weighed. Each piece was placed in a closed vessel containing 30 ml of THF. The films were freed from solvent after 48 hours on a balanced metal screen. Subsequently, the sieve was dried with the polymer film, which was carried out at 80 0 C for 2 h and the individual films were re-weighed. From the weight quotient (weight after washing / original weight), the gel content was determined.
  • the assessment can also be done by color density measurement. If the ink transfer on a counter-stripe has no cloudy structures, the color density of individual segments on it is measured with the densitometer at 10 points in each case. Optionally, a graphic plot of the color density versus the strike time can be made at a time after printing in which the backsheet has been printed. As a result of evaluation with a densitometer, the relative color density RF in% is obtained. According to the following relationship
  • DV average value of the measured values of the color density of the printed counterstrip. The result is represented by the color density on the printed counterstrip with two decimal places, against the travel time (time interval in s.).
  • Formulation 1 with binder A was applied to a wood free, 58 g / m heavy base paper by simple curtain coating on this substrate.
  • the application weight was 15 g / m 2 at a substrate web speed of 1,000 m / min.
  • Example 2 Formulation 2 of the coating composition with binder B was applied to a wood-free substrate weighing 58 g / m 2 by simple curtain coating on its surface at a coating weight of 15 g / m 2 at a paper web speed of 1,000 m / min.
  • the coating composition according to Formulation 3 with binder C was also applied to a wood-free, 58 g / m 2 heavy substrate by means of simple Vorvorstrei ⁇ Chen on its surface.
  • the application weight was 15 g / m 2 at a paper speed of also 1,000 m / min.
  • a coating composition according to Formulation D was applied by simple curtain coating on a wood-free, 58 g / m 2 heavy Rohsub ⁇ strat with an application weight of 15 g / m 2 , wherein the Substratbahnge- speed was also 1,000 m / min.
  • a coating composition of Formulation F according to Table 1 was applied to a wood-free, 58 g / m 2 heavy raw substrate by means of simple curtain coating on the surface of the binder E, wherein a coating weight of 15 g / m 2 was set and the substrate web speed was 1,000 m / min.
  • Example 6
  • Example 7 a coating composition according to Formulation 7 with binder F was applied to a wood-free, 58 g / m 2 heavy raw substrate by means of simple curtain coating on the surface, wherein a coating weight of 15 g / m 2 was set and the substrate web speed also 1,000 m / min fraud.
  • a coating composition according to Formulation 8 with binder G was applied to a wood-free, 58 g / m 2 heavy crude substrate by means of ein ⁇ fold curtain coating on the surface, thedemandge ⁇ weight to 15 g / m 2 at a substrate web speed of 1,000 m / min was set.
  • a coating composition according to Formulation 9 with binder H was applied to a wood-free, 58 g / m 2 heavy raw substrate by means of simple curtain coating on the substrate surface with a coating weight of 15 g / m 2 , wherein a substrate web speed of 1,000 m / min was set.
  • a coating composition according to Formulation 10 with binder I was applied to a wood-free, 58 g per square meter raw substrate by simple curtain coating on the substrate surface with aquestge ⁇ weight of 15 g per square meter, with a substrate web speed of 1000 m per min was set.
  • the substrates coated according to Examples 1 to 9 were then calendered with a Janus calender (Voith) under the following conditions:
  • Table 4 gives an overview of a formulation applied to a substrate by the blade coating method.
  • Comparative Example 1 Formulation No. 1 was applied to a wood-free 58 g / m 2 raw paper by means of a conventional blade application method to the substrate at a coating weight of 15 g / m at a paper web speed of 1200 m / min ,
  • FIG. 1 shows a diagram from which the relationship between particle size and the resulting binding force of a coating composition is obtained.
  • the ordinate indicates the number of passes of a paper sample in accordance with the test construction offset mentioned above, up to which a first picking occurs.
  • the illustration according to FIG. 1 shows that the binding force of a coating composition drops with increasing particle size.
  • the coating composition containing a styrene-butadiene-acrylonitrile (SBAN) based binder having a particle size of 80 nm achieves a higher number of passes before plucking occurs (over six passes), while a paint composition containing a stain Binder (SBAN) with a particle size of 140 nm, only four passes (10 s) reached and then begins the plucking.
  • FIG. 1 shows that the binding force of a coating composition drops with increasing particle size.
  • the coating composition containing a styrene-butadiene-acrylonitrile (SBAN) based binder having a particle size of 80 nm achieves
  • binders with a small particle size of less than 130 nm can be used because the curtain coating process does not impose a pressure pulse on a substrate, which leads to a migration into the base paper, and thus a poorer binding force and less binding to the substrate Episode has. Due to the absence of a pressure pulse during the curtain coating process, the coating composition is not pressed into the base paper.
  • the color density is plotted after 120 s Wegschlagzeit, while on the x-axis (abscissa) the particle sizes of the binder used are plotted. It can be seen from the graph of FIG. 2 that the color density remains substantially below the color density after 120 seconds of strike time in coating compositions containing a binder based on styrene-butadiene-acrylonitrile (SBAN) with a particle size of 140 nm of a coating composition comprising a binder (SBAN) having a particle size of 80 nm.
  • SBAN styrene-butadiene-acrylonitrile
  • the achievable color density after 120 seconds for the coating composition having a particle size of 100 nm is about 0.3, while the coating composition comprising a SB binder having a particle size of 130 nm, significantly darun ⁇ ter.
  • SB styrene-butadiene

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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Composition d'enduit colorée qui peut être appliquée sur des substrats à recouvrir tels que par exemple du papier brut ou du carton, selon un procédé d'enduction à rideau liquide. Le substrat, pour lequel il peut s'agir de papier brut ou de carton, est enduit à l'aide d'un ou plusieurs rideaux liquides tombant librement, un liant étant ajouté au liquide d'enduction. Le liant est choisi dans le groupe contenant les liants latex styrène-butadiène, les liants latex styrène-acrylate, les liants latex styrène-butadiène-acrylonitrile, les liants styrène-anhydride de l'acide maléique ainsi que les liants styrène-acrylate-anhydride de l'acide maléique, ledit liant possédant une taille de particules inférieure à 130 nm.
EP05787450A 2004-09-17 2005-09-16 Procédé de fabrication de substrats enduits une ou plusieurs fois à l'aide d'une composition d'enduit colorée contenant un liant à fort pouvoir d'adhérence Withdrawn EP1792009A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410045172 DE102004045172A1 (de) 2004-09-17 2004-09-17 Verfahren zur Herstellung von ein- oder mehrfach gestrichenen Substraten mit einer ein Bindemittel vor Haftung umfassenden Streichfarbenzusammensetzung
PCT/EP2005/009980 WO2006029883A2 (fr) 2004-09-17 2005-09-16 Procédé de fabrication de substrats enduits une ou plusieurs fois à l'aide d'une composition d'enduit colorée contenant un liant à fort pouvoir d'adhérence

Publications (1)

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EP1792009A2 true EP1792009A2 (fr) 2007-06-06

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EP05787450A Withdrawn EP1792009A2 (fr) 2004-09-17 2005-09-16 Procédé de fabrication de substrats enduits une ou plusieurs fois à l'aide d'une composition d'enduit colorée contenant un liant à fort pouvoir d'adhérence

Country Status (9)

Country Link
US (2) US20070212532A1 (fr)
EP (1) EP1792009A2 (fr)
JP (1) JP2008513617A (fr)
CN (1) CN101057035A (fr)
AU (1) AU2005284219B2 (fr)
BR (1) BRPI0515410A (fr)
CA (1) CA2580255A1 (fr)
DE (1) DE102004045172A1 (fr)
WO (1) WO2006029883A2 (fr)

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Also Published As

Publication number Publication date
AU2005284219B2 (en) 2011-02-10
US20100080919A1 (en) 2010-04-01
DE102004045172A1 (de) 2006-03-23
WO2006029883A2 (fr) 2006-03-23
BRPI0515410A (pt) 2008-07-22
JP2008513617A (ja) 2008-05-01
AU2005284219A1 (en) 2006-03-23
CA2580255A1 (fr) 2006-03-23
WO2006029883A3 (fr) 2007-02-15
US20070212532A1 (en) 2007-09-13
CN101057035A (zh) 2007-10-17

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