EP2953797A1 - Heat sensitive recording material - Google Patents
Heat sensitive recording materialInfo
- Publication number
- EP2953797A1 EP2953797A1 EP14716224.2A EP14716224A EP2953797A1 EP 2953797 A1 EP2953797 A1 EP 2953797A1 EP 14716224 A EP14716224 A EP 14716224A EP 2953797 A1 EP2953797 A1 EP 2953797A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nanoparticles
- recording material
- material according
- starch
- crosslinked
- 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.)
- Granted
Links
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- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- JHOKTNSTUVKGJC-UHFFFAOYSA-N n-(hydroxymethyl)octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCO JHOKTNSTUVKGJC-UHFFFAOYSA-N 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 235000019809 paraffin wax Nutrition 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 230000026731 phosphorylation Effects 0.000 description 1
- 238000006366 phosphorylation reaction Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 description 1
- 150000005846 sugar alcohols Chemical class 0.000 description 1
- 239000003774 sulfhydryl reagent Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000001226 triphosphate Substances 0.000 description 1
- 235000011178 triphosphate Nutrition 0.000 description 1
- 125000002264 triphosphate group Chemical class [H]OP(=O)(O[H])OP(=O)(O[H])OP(=O)(O[H])O* 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
- 235000021119 whey protein Nutrition 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
- B41M5/337—Additives; Binders
- B41M5/3372—Macromolecular compounds
-
- 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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
-
- 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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/04—Direct thermal recording [DTR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
Definitions
- the invention relates to a heat-sensitive recording material
- thermo paper with a flat carrier (thermal paper), a
- Thermal reaction layer on at least one side of the sheet carrier and optionally one between the sheet carrier and the respective
- Thermore counseling formed intermediate layer (thermal insulation layer) and optionally with other layers.
- the invention also relates to a
- Heat-sensitive recording materials of the type described above are known for example from US-A-6,759,366 and WO 2008/006474 AI.
- US Pat. No. 6,759,366 describes a heat-sensitive recording material which has in each case a thermal reaction layer on the top and the bottom side of a carrier substrate.
- the carrier substrate is preferably based on cellulose and is thermally insulating. This ensures that the thermal pulse generated during thermal printing largely for the development of
- Thermal reaction layer is available. Preferably is between
- Carrier substrate and thermal reaction layer a so-called primer layer formed, through which a better adhesion of the layers and the thermal insulation necessary for the thermal printing is achieved.
- WO 2008/006474 A1 likewise discloses a heat-sensitive thermosensitive material
- Recording material having a flat support, a thermal reaction layer on at least one side of the planar support and an intermediate layer formed between the sheet-like support and the respective thermal reaction layer, which contains embedded in a binder hollow sphere pigments, and optionally with further layers and / or top layers, wherein the Hollow sphere pigments are present as a composite pigment, and wherein nano-scale pigment particles adhere to the surface of an organic hollow sphere pigment.
- the recording material known from WO 2008/006474 A1 shows in particular improved insulating properties.
- As an intermediate layer a material is applied, the said pigments in a suitable
- the binder serves in particular to the
- Binders are synthetic and / or natural polymers used.
- Dispersion medium containing water as a main component, and the intermediate layer contains a heat-insulating organic pigment which is in the form of hollow or cup-shaped particles.
- Binders are of great importance in heat-sensitive recording materials. They are used to fix pigments and other components, such as color formers, coreactants, sensitizers and lubricants and other additives. Binders also favor the bonding of the different layers to one another. As binders are usually starches, Polyvinyl alcohol or synthetic binders, such as styrene / butadiene latices and Stryol / acrylate latices used. Binder can be applied in a pure form directly on one or both sides of the base paper as a surface sizing or introduced in the so-called sump operation on the paper surface in the paper (impregnation).
- thermosensitive recording materials have various disadvantages, such as in terms of
- the object of the present invention is therefore to provide a heat-sensitive recording material which overcomes the disadvantages of the known heat-sensitive recording materials.
- heat-sensitive recording materials are to be provided which have improved properties in terms of aging resistance and laying behavior.
- this object is achieved by a heat-sensitive thermosensitive material
- Nanoparticles is used.
- the crosslinked biopolymeric material in the form of nanoparticles has a degree of swelling of less than 2, preferably of less than 1. The degree of swelling was determined as described in DE 11 2007 002 203 T5:
- the degree of swelling refers to volume expansion when the crosslinked biopolymeric material swells in water in the form of nanoparticles.
- a sample of anhydrous amount of 2 g is added to 200 ml of pure water, dispersed therein and immediately thereafter, this is heated in a well-boiling water bath for 30 minutes and cooled to room temperature.
- the part of the water which has been evaporated is added and the sample is redispersed and 100 ml of the dispersion are added exactly to a graduated cylinder.
- the measuring cylinder is allowed to stand at room temperature for 24 hours, and a precipitate is visually measured for its amount (ml), and this value is taken as a degree of swelling.
- the choice of material of the sheet carrier is not critical. However, it is preferred that the sheet carrier is based on cellulose fibers, a synthetic paper carrier whose fibers are wholly or partly made of synthetic fibers, or a plastic film.
- the flat carrier is preferably used with a basis weight of about 20 to 600 g / m 2 , in particular from about 30 to 300 g / m 2 .
- the selection of the materials of the thermal reaction layer (s) are no special requirements. Suitable materials are color formers, color developers, other binders, pigments, melt aids,
- the thermal reaction layer therefore contains the essential functional components which are ultimately responsible for the development of a typeface or an image.
- color formers in the form of 2-anilino-3-methyl-6-diethylamino-fluoran, 2-anilino-3-methyl-6-di-n-butylamino-fluoran, 2-anilino-3-methyl-6 - (N-ethyl-, N -pentino-amino-amino) -fluoran, 2-anilino-3-methyl-6- (N-methyl-, N-propyl-amino) -fluoran, 2-anilino-3-methyl-6 - (N-ethyl, N-isopentyl-amino) -fluoran and / or 3,3-bis (4-dimethylamino-phenyl) -6-dimethyl-amino-phthalide present and the color developer in the form of phenol or
- Urea derivatives such as 2,2-bis (4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) - sulfone, 4-hydroxy-4 '-iso-propoxy-diphenyl sulfone, bis (3-allyl-4- hydroxyphenyl) sulfone, 2,2-bis (4-hydroxyphenyl) -4-methyl-pentane, N- (toluenesulfonyl) -N ' - (3-p-toluenesulfonyl-oxy-phenyl) -urea and zinc salts of Derivatives of
- Thermore syndromes nor various other properties favoring substances or auxiliaries may be included. These may be, for example, sensitizing melt aids, lubricants,
- the sensitizing melt aids are e.g. in the form of 2-benzyloxy-naphthalene (BON), p-benzylbiphenyl (PBBP), oxalic acid dibenzyl ester, oxalic acid di- (p-methylbenzyl) ester, 1,2-bis- (phenoxy-methyl) -benzene, 4- (4-Tolyloxy) - biphenyl, ethylene glycol diphenyl ether, ethylene glycol m-tolyl ether and 1,2-bis (3,4-dimethylphenyl) ethane and the lubricant in the form of fatty acid amides, such as. B.
- BON 2-benzyloxy-naphthalene
- PBBP p-benzylbiphenyl
- oxalic acid dibenzyl ester oxalic acid di- (p-methylbenzyl) ester
- 1,2-bis- (phenoxy-methyl) -benzene
- stearic acid amide fatty acid alkanolamides, such as.
- stearic acid methylolamide stearic acid methylolamide
- ethylene-bis-alkanoylamides such as.
- synthetic waxes such as ethylene bis-stearoylamide
- Ethylene waxes propylene waxes of different hardness or natural waxes, such as. As carnauba wax and / or fatty acid metal soaps, such as.
- As zinc stearate, calcium stearate or behenate salts the rheology aids in the form of water-soluble hydrocolloids, such as starches, starch derivatives, sodium alginates, polyvinyl alcohols, methylcelluloses, hydroxyethyl or hydroxypropylmethylcelluloses, carboxymethylcelluloses, poly (meth) acrylates, the optical brighteners in the form of whiteners z.
- B. from the substance groups diaminostilbene-disulfonic acid, distyryl-biphenyls, benzoxazole derivatives, the fluorescent substances in the form of daylight fluorescent pigments of different hues or fluorescent fibers, the
- Anti-aging agents in the form of sterically hindered phenols such as 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexyl-phenyl) -butane, l, l, 3-tris (2-methyl-4 hydroxy-5-tert-butylphenyl) butane, l l'-bis (2-methyl-4-hydroxy-5-tert-butylphenyl) butane and 1,1-bis- (4, - hydroxyphenyl) cyclohexane.
- 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexyl-phenyl) -butane such as 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexyl-phenyl) -butane, l, l, 3-tris (2-methyl-4 hydroxy-5-tert-butylphenyl) butane, l l'-bis (2-methyl-4-hydroxy-5-tert-butylphenyl)
- the thermal reaction layer (s) having a basis weight of about 1 to 8 g / m 2 , in particular from about 2 to 6 g / m 2 is used.
- an intermediate layer (s) can (can) (usual) intermediate layer (s) are used.
- the interlayer increases the image quality, prevents heat conduction into the base paper and supports the function and sensitivity properties of the thermal reaction layer. In particular, it also contributes to a sufficient fixation of the fusible components in the writing process and thus ensures a good runnability in the thermal printer.
- Suitable materials of the intermediate layer (s) are those which allow the adhesion of the thermal reaction layer to the planar support or serve for the protection or insulation of the thermal reaction layer.
- Nanoparticles other binders, pigments, rheological aids,
- the binders are in the form of synthetic and / or natural polymers.
- the pigments are preferably organic hollow-sphere pigments or inorganic pigments, such as, for example, calcined kaolin. Mixtures of these pigments, but also CaC0 3 or Ca silicates or others can be used.
- the respective intermediate layer is preferably used with a basis weight of about 1 to 14 g / m 2 and in particular of about 2 to 9 g / m 2 .
- additional layers can be used.
- an outer layer (topcoat) can be applied, which is the
- a protective layer Function of a protective layer has.
- film-forming polymers such as polyvinyl alcohols, modified
- the function of the protective layer is particularly favorable when the film-forming polymer is substantially crosslinked.
- cross-linking agents during drying of the coating used in forming the protective coating.
- backcoat also on the back of another layer may be present (backcoat), the additional protection, for example, when printing, laminating, etc. brings.
- the essence of the invention is that in at least one of the layers, preferably in the / the thermal reaction layer (s) and / or the /
- the crosslinked biopolymeric material in the form of nanoparticles is preferably prepared according to the method described in US-A-6,677,386, after which a biopolymeric material, such as starch, containing amylose and amylopectin, or both, is mixed with a plasticizer. This mixture is mixed under the action of high shear forces to plasticize the biopolymer material and form a thermoplastic melt phase, preferably in a co-rotating, fully intermeshing twin-screw extruder, thereby losing the crystalline structure of the biopolymer material.
- To network the nanoparticles during the Mixing added a crosslinking agent.
- the nanoparticles leave the extruder as a strand, which is ground to a fine powder. In the powder, the nanoparticles are agglomerated and can be dispersed in an aqueous medium.
- the biopolymer material may be starch or other
- Polysaccharides act like cellulose and plant gums as well as proteins (eg gelatin, whey protein).
- the biopolymeric material may be previously modified, e.g. With cationic groups, with carboxymethyl groups, by acylation, phosphorylation, hydroxyalkylation, oxidation or the like.
- Starches, starch derivatives and mixtures of other polymers containing at least 50% starch are preferred.
- the starch, either as a single component or in a mixture with other polymers, and the starch derivatives preferably have a molecular weight of at least 10,000 g / mol, and are not dextran or dextrin.
- Particularly preferred are waxy starches, such as waxy maize starch.
- the biopolymic material preferably has a dry weight of at least about 50% by weight at the beginning of the process.
- the process is preferably carried out at at least about 40 ° C but below the decomposition temperature of the biopolymeric material, for example at about 200 ° C.
- the shear forces may be such that 100 J of specific mechanical energy per g of biopolymeric material act. Depending on the equipment used, the minimum energy may be higher; even if non-gelatinized material is used, the specific mechanical energy may be higher, e.g. B.
- the plasticizer may be water or a polyol
- the total amount of plasticizer is preferably between about 15 and 50%.
- Lubricants such as lecithin, other phospholipids or monoglycerides may, if may be added, for example, in an amount of about 0.5 to 2.5% by weight.
- An acid preferably a solid or semi-solid organic acid, such as maleic acid, citric acid, oxalic acid, lactic acid, gluconic acid or a carbohydrate degrading enzyme, such as amylase, may be present in an amount of about 0.01 to 5% by weight, based on the biopolymeric material, to be present.
- the acid or enzyme aids in the slight depolymerization that is beneficial in producing nanoparticles of defined size.
- the crosslinking is preferably reversible, which can be partially or completely canceled after the mechanical processing.
- Suitable reversible crosslinking agents preferably include those which form chemical bonds at low water concentration and re-dissociate or hydrolyze in the presence of a higher water concentration. This type of crosslinking results in a temporarily high viscosity during the process followed by a lower viscosity after completion of the process.
- Examples of reversible crosslinking agents are dialdehydes and polyaldehydes,
- Acid anhydrides and mixed anhydrides and the like form (e.g., succinate and acetic anhydride).
- Suitable dialdehydes and polyaldehydes are
- Glyoxal is a particularly suitable crosslinking agent.
- crosslinking agents can be used alone or as a mixture of reversible and non-reversible crosslinking agents.
- Crosslinking agents such as epichlorohydrin and other epoxies, triphosphates, divinyl sulphone can be used as non-reversible cross-linking agents for polysaccharide-based biopolymeric material. Dialdehydes, thiol reagents and the like can be used for protein-based biopolymers.
- the crosslinking can take place in acid or base catalysis. The amount of crosslinking agent may be between about 0.1 and 10 weight percent, relative to the biopolymeric material.
- the crosslinking agent may be present at the beginning of the mechanical reaction, but in the case of a non-pregelatinized biopolymeric material, such as granular starch, it is preferable to that the crosslinking agent is added later, for example during the mechanical reaction.
- a latex preferably in the form of a latex by dispersing it in a suitable solvent, usually in water and / or another hydroxylic solvent such as alcohol, at a concentration of between about 4 and 50% by weight, more preferably between about 10 and 40% by weight.
- a cryogenic milling operation Prior to dispersion, a cryogenic milling operation may be performed, but stirring at a slightly elevated temperature may also be effective. This processing results in a gel that takes the form of a latex either spontaneously or after induction by water adsorption.
- Viscosity behavior can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles, such as improved mixing behavior. If desired, this can be used for the application of the particles
- the extrudate is characterized in that it swells in an aqueous solvent, for example in water or a mixture containing at least about 50% water together with a water-miscible solvent such as an alcohol, and after
- Viscosity drop forms a dispersion of nanoparticles.
- crosslinked biopolymeric material in the form of nanoparticles n it is also possible to use conjugates thereof.
- This is the above-described crosslinked biopolymeric material in the form of nanoparticles, which are chemically or physically connected to a further additive.
- suitable additives are titanium dioxide, aluminum oxide, aluminum trihydrate, sodium aluminum phosphate, aluminum phosphate, sodium aluminum magnesium silicate, fly ash, zeolites, sodium aluminum silicate,
- the crosslinked biopolymeric material in the form of nanoparticles is preferably in the thermal reaction layer / s and / or the /
- Intermediate layer (s) used is particularly preferred.
- Particularly preferred is its use in the / the intermediate layer (s), as achieved by the remaining bar porosity an increase in the insulation and thus the thermal
- Reaction sensitivity could be improved.
- this favors the absorption of fusible components in the writing process, which is particularly advantageous for heat-sensitive recording materials without topcoat with respect to the laying behavior on the thermal bar.
- the crosslinked biopolymeric material in the form of nanoparticles is starch, a starch derivative or a polymer blend having at least about 50% by weight of starch or
- Starch derivative with starch and starch derivatives being particularly preferred. Most preferred is starch, especially a crosslinked starch that has not been otherwise modified.
- the mean average particle size of the nanoparticles is preferably between about 10 nm and 600 nm, more preferably between about 40 nm and 400 nm, and most preferably between about 40 nm and 200 nm.
- the crosslinked biopolymer material may be, for example, Ecosphere 2240 Biolatex Binder, Ecosphere 92240 , 92273, X282 Biolatex Binder and Ecosphere 2202 (all available from EcoSynthetix Inc.).
- the biopolymeric material in the form of nanoparticles is preferably present in the respective layer (s) in an amount of about 1 to 50% by weight, more preferably in an amount of about 2 to 40% by weight, and most preferred in an amount of about 2 to 30 wt .-%, based on the total weight of the dry mass of the respective layer before. Too low amounts have the disadvantage that the connection of the adjacent layers is not satisfactory.
- the sheet carrier has a basis weight of about 20 to 600 g / m 2 , in particular from about 30 to 300 g / m 2
- the respective (n) intermediate layer (s) has a basis weight of about 1 to 14 g / m 2 , in particular from about 2 to 9 g / m 2 and / or the thermal reaction layer (s) has a basis weight of about 1 to 8 g / m 2 , in particular from about 2 to 6 g / m 2 .
- At least one further binder is also present in the layer (s) in which or in which the crosslinked biopolymeric material is in the form of nanoparticles.
- the invention is substantially free, provided that the properties of the heat-sensitive recording material are not impaired thereby.
- At least one further binder in the form of water-soluble starches, starch derivatives, hydroxyethylcelluloses, polyvinyl alcohols, modified polyvinyl alcohols, acrylamide / (meth) acrylate copolymers and / or acrylamide / acrylate / methacrylate terpolymers is preferred. Such materials result in a coating that
- Polymethacrylate esters styrene / acrylate ester copolymers, styrene / butadiene copolymers, polyurethanes, acrylate / butadiene copolymers, polyvinyl acetates and / or acrylonitrile / butadiene copolymers, and the like. It is located in
- the at least one further binder may be present in all layers, preferably in the thermal reaction layer (s) and / or the intermediate layer (s), the use of which in the intermediate layer (s) being particularly preferred since this results in the desired Properties can be particularly improved.
- Another binder is understood here to mean a binder which, in addition to the crosslinked biopolymeric material, is used in the form of nanoparticles in the layer (s) in which the crosslinked biopolymeric material in the form of nanoparticles is present. It goes without saying that one or more conventional binders may be present in those layers in which the crosslinked biopolymeric material in the form of nanoparticles n is not used.
- one or more conventional binders may be completely or partially replaced by a crosslinked biopolymeric material in the form of nanoparticles. This applies to all layers.
- the heat-sensitive recording material according to the invention is a heat-sensitive recording material having a flat support, a thermal reaction layer on at least one side of the planar support and a formed between the flat support and the respective thermal reaction layer
- Nanoparticles is used.
- the heat sensitive comprises
- biopolymeric material in the form of nanoparticles including at least one Pigment, preferably at least one hollow sphere pigment, and at least one co-binder, preferably polyvinyl alcohol, latex or starch (this is a different strength than the starch as the crosslinked biopolymer
- Material in the form of nanoparticles can be used, for example, to natural enzymatically or oxidatively degraded starches, starch esters or
- Starch ethers more preferably polyvinyl alcohol.
- a Holkugelpigments also an inorganic pigment or a mixture of both can be used.
- Particularly suitable hollow sphere pigments are styrene / acrylate copolymers.
- the crosslinked biopolymeric material in the form of nanoparticles in this case is preferably in an amount of about 1 to 40% by weight, particularly preferably in an amount of 2 to 30 wt .-%, the
- Pigment (mixture) preferably in an amount of about 50 to 95% by weight, more preferably in an amount of about 60 to 90% by weight, and the co-binder preferably in an amount of about 0 to 10% by weight. %, more preferably about 1 to 9 wt .-%, before.
- the crosslinked biopolymeric material is obtainable in the form of nanoparticles by means of a method in which
- biopolymer material is plasticized using shear forces and in the presence of a crosslinking agent and optionally subsequently dispersed in a hydroxylic solvent, preferably water.
- both sides of the carrier substrate can be provided simultaneously with the coating compound for forming the intermediate layers. It is also possible first to provide the one and then the other side of the carrier substrate with intermediate layers. The respective order procedure is thus subject to no restrictions and can be carried out in the usual way. The same applies to the formation of the thermal reaction layer, in which an aqueous dispersion containing the necessary and promoting constituents, applied in a conventional manner and is dried. The skilled person therefore requires no further technical instructions.
- the present invention also relates to a process for the preparation of the above-described heat-sensitive recording material, in which a crosslinked biopolymer material in the form of nanoparticles, preferably as a powder, particularly preferably directly in the dye batch, is used.
- Streichleiterfeststoffgehalte can be provided without this, the theological properties are adversely affected.
- the heat-sensitive recording material according to the invention can be used in many fields, for example as paper for fax printing, the printing of receipts or receipts, parking tickets, admission and travel tickets, medical examination protocols and barcode labels.
- Binders or presumably especially their low molecular weight accompanying substances from all layers, can impair the aging resistance. These negative effects increase with increasing storage time of the paper at elevated temperatures and increased ambient humidity, as is the case for example in the tropics. Migration processes, in particular the low molecular weight impurities probably play a role here. In particular, the use of synthetic latexes has a negative impact on writing performance and writing stability.
- biopolymeric material in the form of nanoparticles leads to a
- thermal paper also with regard to the so-called laying behavior on the thermal bar. This is an important feature of thermal paper, which reflects the degree of contamination of a thermal bar in the application.
- Thermal printer it comes to a melting process, wherein the forming melt can lead to deposits on the thermal bar of the printer.
- thermal melt is sufficiently fixed in the thermal function layers.
- a central role here assumes the absorption capacity of the intermediate layer, with a porous line structure is very helpful.
- the use of a crosslinked biopolymeric material in the form of nanoparticles in the intermediate layer leads to such a bar porosity, whereby a reduced tendency to fouling of the
- Thermal printhead can be achieved, especially when using a little absorptive hollow sphere pigment as a pigment in the intermediate layer.
- thermosensitive recording material of the present invention is less expensive to produce and the use of synthetic binders which must be obtained from fossil raw materials can be reduced.
- An interlayer formulation according to Table 1 (formulation 1) or an interlayer formulation according to Table 2 (formulation 2) was applied with a dry application of about 3 g / m 2 by means of a doctor blade to a conventional flat support (thermal paper) with a respective basis weight of 44 g / m 2 applied and dried.
- the paper substrates thus prepared were coated with a thermal coating compound according to Table 3 (recipe 3).
- the coat application was about 4.5 g / m 2 (otro) by means of a doctor blade.
- the coating dispersion A mentioned there was obtained by milling 30 parts by weight of 2-anilino-3-methyl-6-di-n-butylamino-fluoran with 55 parts by weight of a 15% aqueous polyvinyl alcohol solution in a ball mill to an average particle size of 1.5 ⁇ produced.
- Coating Dispersion B was prepared by milling 65 parts by weight of 2,2-bis (4-hydroxyphenyl) propane together with 35 parts by weight of benzyl naphthyl ether 75 parts by weight of a 15% polyvinyl alcohol aqueous solution and 90 parts Parts by weight of water in egg ner mill to an average particle size of 1.5 ⁇ produced.
- the heat-sensitive recording materials thus obtained were subjected to an aging test (aging according to inscription) at two defined climates over a period of several weeks. Image permanence was determined weekly. For this purpose, a typeface was generated on a thermal printer and its optical density determined before aging. Thereafter, the material was aged free-hanging in different climates over a period of time. climates were dry heat (50 ° C) and wet heat (40 ° C / 80% RH) each over a period of 1, 2, 4, 6 and 9 weeks. After aging, the
- thermosensitive recording material using Formulation 2 shows a more stable aging behavior of the thermosensitive recording material using Formulation 2 as compared with a thermosensitive recording material using Formulation 1.
- the increased stability of the background can be seen especially with a longer storage period. This trend is particularly strong under warm, humid climatic conditions.
- Table 5 shows the evaluation of the deposit on the thermal bar:
- thermosensitive recording material with formulation 2 showed a significantly better deposition behavior than the heat-sensitive
- a conventional thermal paper was brought with its thermal reaction layer (reference paper) in contact with a pure binder layer, which was applied to a base paper (counter paper).
- the reference or counterfeit paper was a standard POS paper (available from Textilfabrik August Koehler SE).
- the binder to be tested was provided as a solution or as a dispersion.
- the binder solution or dispersion was on a Thermohar paper applied by knife and dried.
- the coating weight was in the range of 2 to 3 g / m 2 (dry).
- the paper was then stored at 35 ° C / 75% r. F. stored between plexiglass plates at a defined pressure of 7kg.
- thermosensitive recording material using a crosslinked biopolymer material in the form of nanoparticles (No. 2) a significantly improved storage stability compared to heat-sensitive
- SB latex 1 XZ34946.01 styrene-butadiene copolymer (Styron)
- SB latex 2 Synthomer 76M 10 (Synthomer)
- SB latex 3 Litex PX9366 (from Polymer Latex)
- SB latex 4 XZ9182.00 (from Styron)
- PV-OH low viscosity polyvinyl alcohol
- Fa. Kuraray insect-like polyvinyl alcohol
- ecosphere 2240 crosslinked starch
- EcoSphere ® quality Fa. Ecosynthetix
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013002297.5A DE102013002297A1 (en) | 2013-02-08 | 2013-02-08 | Heat-sensitive recording material |
PCT/DE2014/100043 WO2014121788A1 (en) | 2013-02-08 | 2014-02-07 | Heat sensitive recording material |
Publications (2)
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EP2953797A1 true EP2953797A1 (en) | 2015-12-16 |
EP2953797B1 EP2953797B1 (en) | 2020-05-06 |
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EP14716224.2A Active EP2953797B1 (en) | 2013-02-08 | 2014-02-07 | Heat sensitive recording material |
Country Status (8)
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US (1) | US9676218B2 (en) |
EP (1) | EP2953797B1 (en) |
KR (1) | KR102242986B1 (en) |
CN (1) | CN105050825B (en) |
BR (1) | BR112015018636B1 (en) |
DE (2) | DE102013002297A1 (en) |
ES (1) | ES2805368T3 (en) |
WO (1) | WO2014121788A1 (en) |
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WO2015141497A1 (en) | 2014-03-17 | 2015-09-24 | 日本製紙株式会社 | Heat-sensitive recording material |
DE102018111495B4 (en) | 2018-05-14 | 2020-04-09 | Papierfabrik August Koehler Se | Thermoresponsive paper coatings based on cellulose derivatives |
JP2021146642A (en) * | 2020-03-19 | 2021-09-27 | 株式会社リコー | Thermosensitive recording medium, method for producing thermosensitive recording medium, and article |
PL3957489T3 (en) * | 2020-08-19 | 2023-03-20 | Mitsubishi Hitec Paper Europe Gmbh | Developer-free thermosensitive recording material |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS62170386A (en) * | 1986-01-24 | 1987-07-27 | Fuji Photo Film Co Ltd | Thermosensible recording material |
JP3083895B2 (en) * | 1991-11-25 | 2000-09-04 | 株式会社リコー | Thermal recording material |
MX220923B (en) | 1999-01-25 | 2004-06-11 | Ato Bv | Biopolymer nanoparticles. |
US6759366B2 (en) | 2001-12-18 | 2004-07-06 | Ncr Corporation | Dual-sided imaging element |
DE602007000133D1 (en) * | 2006-03-15 | 2008-11-06 | Ricoh Kk | Reversible thermosensitive recording medium, reversible thermosensitive recording label, reversible thermosensitive element, image processing apparatus and image processing method |
DE102006032521B3 (en) | 2006-07-12 | 2008-04-03 | Papierfabrik August Koehler Ag | Heat-sensitive recording material |
BRPI0716663B1 (en) | 2006-08-15 | 2019-08-27 | Ecosynthetix Inc | process to produce a biopolymer nanoparticle product |
US8183175B2 (en) * | 2006-09-19 | 2012-05-22 | Mitsubishi Paper Mills Limited | Thermal recording material |
JP4726987B2 (en) * | 2007-03-29 | 2011-07-20 | 日本製紙株式会社 | Thermal recording material |
MX2011005791A (en) | 2008-12-03 | 2011-06-20 | Ecosynthetix Inc | Process for producing biopolymer nanoparticle biolatex compositions having enhanced performance and compositions based thereon. |
US8513160B2 (en) | 2009-03-02 | 2013-08-20 | Oji Holdings Corporation | Heat-sensitive recording material and method for producing same |
CN102917883B (en) * | 2010-03-30 | 2015-01-14 | 三菱制纸株式会社 | Method for manufacturing Heat-sensitive recording material |
-
2013
- 2013-02-08 DE DE102013002297.5A patent/DE102013002297A1/en not_active Withdrawn
-
2014
- 2014-02-07 WO PCT/DE2014/100043 patent/WO2014121788A1/en active Application Filing
- 2014-02-07 EP EP14716224.2A patent/EP2953797B1/en active Active
- 2014-02-07 CN CN201480009807.XA patent/CN105050825B/en active Active
- 2014-02-07 BR BR112015018636-0A patent/BR112015018636B1/en active IP Right Grant
- 2014-02-07 DE DE112014000727.7T patent/DE112014000727A5/en active Pending
- 2014-02-07 ES ES14716224T patent/ES2805368T3/en active Active
- 2014-02-07 KR KR1020157020888A patent/KR102242986B1/en active IP Right Grant
- 2014-02-07 US US14/766,540 patent/US9676218B2/en active Active
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See references of WO2014121788A1 * |
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Publication number | Publication date |
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ES2805368T3 (en) | 2021-02-11 |
BR112015018636A2 (en) | 2017-07-18 |
BR112015018636B1 (en) | 2021-12-07 |
US9676218B2 (en) | 2017-06-13 |
DE102013002297A1 (en) | 2014-08-14 |
CN105050825A (en) | 2015-11-11 |
DE112014000727A5 (en) | 2015-11-05 |
KR20150118118A (en) | 2015-10-21 |
EP2953797B1 (en) | 2020-05-06 |
KR102242986B1 (en) | 2021-04-21 |
CN105050825B (en) | 2017-10-31 |
WO2014121788A4 (en) | 2014-10-23 |
US20150367664A1 (en) | 2015-12-24 |
WO2014121788A1 (en) | 2014-08-14 |
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