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
  • B41M5/40—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
  • B41M5/443—Silicon-containing polymers, e.g. silicones, siloxanes
• • 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
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
  • B41M5/3333—Non-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
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
  • B41M5/3333—Non-macromolecular compounds
  • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
  • B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
• • 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
  • B41M5/3377—Inorganic compounds, e.g. metal salts of organic acids
• • 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
  • B41M2205/28—Storage stability; Improved self life
• • 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
  • B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
• • 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
  • B41M5/323—Organic colour formers, e.g. leuco dyes
  • B41M5/327—Organic colour formers, e.g. leuco dyes with a lactone or lactam ring
  • B41M5/3275—Fluoran compounds

Definitions

• the present invention relates to a pressure-sensitive heat-sensitive recording material comprising a support substrate, a heat-sensitive color-forming layer provided on one side of the support substrate comprising at least one non-phenolic color developer and at least one color former, a siliconized layer on top of the heat-sensitive color-forming layer applied to the support substrate. and an adhesive layer on the side of the carrier substrate remote from the heat-sensitive color-forming layer, a process for its production and its use.
• the invention also relates to a semi-finished product, its preparation and its use for the production of the self-adhesive heat-sensitive recording material.
• Self-adhesive thermosensitive recording materials for direct thermal printing applications which have a heat-sensitive color-forming layer (thermal reaction layer) applied to a support substrate and an adhesive layer on the other side of the support substrate, are known.
• a heat-sensitive color-forming layer thermo reaction layer
• a color former and a color developer are usually present, which react with one another under the action of heat and thus lead to a color development.
• These self-adhesive thermosensitive recording materials are usually applied to a release liner ("liner” or "liner”) so that the individual units of the pressure-sensitive thermosensitive recording material do not stick to each other.
• thermosensitive recording materials are so-called linerless self-adhesive thermosensitive recording materials.
• a siliconized layer is usually applied to the heat-sensitive color-forming layer.
• These materials are characterized in that they are not applied to a carrier material, but can be rolled onto themselves, so that the heat-sensitive color-forming layer, to which a siliconized layer is applied, is in direct contact with the adhesive layer.
• components of the adhesive layer, especially the plasticizers can attack the heat-sensitive color-forming layer, resulting in reduced writing performance
• these carrierless self-adhesive thermosensitive recording materials have a topcoat located between the heat-sensitive color-forming layer and the siliconized layer is.
• thermosensitive recording material comprising a substrate having a heat-sensitive layer on one side and an adhesive layer on the other side.
• a protective layer on top of the heat-sensitive layer is provided with a siliconized layer.
• the DE 19757589 B4 discloses a carrierless heat-sensitive recording adhesive sheet comprising a support, a heat-sensitive recording layer provided on one side of the support, a barrier layer provided on the heat-sensitive recording layer, a release layer provided on the barrier layer, and one on top of the other Side layer of the support, wherein the barrier layer is formed of a coating composition comprising colloidal silica, which is in the form of a colloid containing water as a dispersing medium, and at least one resin selected from water-soluble resins and water-dispersible resins.
• the US 5,840,657 discloses a multi-layered, carrierless recording material having a heat-sensitive layer containing a phenolic color developer on one side and an adhesive layer on the other side.
• a heat-sensitive layer containing a phenolic color developer on one side
• an adhesive layer on the other side
• two further layers, a base layer and a cover layer, of a polymer are applied to the heat-sensitive layer.
• the carrier material is only partially coated in order to make selected parts of the surface printable.
• the object of the present invention is to overcome the above-described disadvantages of the prior art.
• thermosensitive recording material should enable good siliconizability of the surface of the heat-sensitive color-forming layer.
• a pressure-sensitive heat-sensitive recording material which can be used without a support.
• an environmentally friendly recording material it is desirable to provide an environmentally friendly recording material.
• thermosensitive recording material comprising a carrier substrate, a heat-sensitive color-forming layer applied on one side of the carrier substrate comprising at least one non-phenolic color developer and at least one color former, a siliconized layer on top of the Carrier substrate applied heat-sensitive color-forming layer, and an adhesive layer on the heat-sensitive color-forming layer facing away from the Carrier substrate, which is characterized in that the siliconized layer rests directly on the heat-sensitive color-forming layer.
• the production of the self-adhesive heat-sensitive recording material according to the invention is associated with significantly lower costs and significantly lower costs.
• the heat-sensitive color-forming layer preferably additionally contains at least one platelet-shaped pigment.
• the at least one platelet-shaped pigment is preferably selected from the group consisting of kaolin, Al (OH) 3 and / or talc. Particularly preferred is the use of kaolin. Very particularly preferred is the use of a Streichkaolin. Such a material is available, for example, under the trade name Kaolin ASP 109 (BASF, Germany).
• platelet-shaped pigment is meant a pigment in which the diameter-to-thickness ratio is about 7 to 40 to 1, preferably about 15 to 30 to 1.
• the particle size of the platelet-shaped pigment is preferably adjusted so that at least about 70%, preferably at least about 85%, of the particles have a particle size of about ⁇ 2 ⁇ m (Sedigraph).
• the pH of the platelet-shaped pigment in aqueous solution is preferably 6 to 8.
• the at least one platelet-shaped pigment is preferably contained in the heat-sensitive color-forming layer of the self-adhesive thermosensitive recording material of the present invention in an amount of about 5 to about 60% by weight, more preferably in the amount of about 15 to about 55 wt .-%, based on the total solids content of the heat-sensitive layer before. If less than 5% by weight of the platelet-shaped pigment is present, this has the disadvantage that the good siliconizability is no longer present. The use of more than 60% by weight has the disadvantage that the propensity to deposit on the printhead increases and the writing power decreases because the relationships between pigments, binders, colorants and developers are adversely affected.
• the selection of the carrier substrate is not critical. However, it is preferred to use paper, synthetic paper and / or a plastic film as the carrier substrate.
• the self-adhesive thermosensitive recording material of the present invention is a linerless self-adhesive thermosensitive recording material.
• carrierless means that the self-adhesive heat-sensitive recording material according to the invention is not applied to a carrier material, but wound up on itself. This has the advantage that the manufacturing costs can be further reduced, more meters per roll are feasible, no disposal costs for disposal of the liner is necessary and more labels can be transported per specific cargo space volume.
• the at least one non-phenolic color developer is preferably a sulfonylurea and / or a compound of the formula (I) wherein Ar 1 and Ar 2 are a phenyl radical and / or a C 1 -C 4 alkyl-substituted phenyl radical.
• a compound of the formula (I) is very particularly preferred.
• the C 1 -C 4 -alkyl-substituted phenyl radical is preferably a methyl radical, more preferably a para-methyl radical.
• Ar 1 and Ar 2 are a para-methyl-substituted phenyl radical.
• Ar 1 is a phenyl radical and Ar 2 is a para-methyl-substituted phenyl radical.
• each of Ar 1 and Ar 2 is a phenyl radical, that is, the at least one color developer is N- (2- (3-phenylureido) phenyl) benzenesulfonamide (hereinafter also referred to as NKK 1304; Manufacturer: Nippon Soda Co. Ltd.).
• the sulfonyl urea contained in the color-forming heat-sensitive layer of the self-adhesive thermosensitive recording material of the present invention in addition to or in lieu of a color developer of formula (I) is preferably selected from the group consisting of N '- (p-toluenesulfonyl) -N'-phenyl-urea, N - (p-toluenesulfonyl) -N'-3- (p-toluenesulphonyl-oxy-phenyl) -urea, (trade name Pergafast 201 ®, manufactured by BASF PF201) and / or 4,4'-bis (p-tolylsulfonylureido) - diphenylmethane.
• the heat-sensitive color-forming layer comprises N- (2- (3-phenylureido) -phenyl) benzenesulfonamide (NKK 1304) and / or N- (p-toluenesulfonyl) - N'-3- (p-toluenesulphonyl-oxy-phenyl) urea (Pergafast 201 (PF201), from BASF) as a color developer.
• N- (2- (3-phenylureido) phenyl) benzenesulfonamide (NKK 1304) and / or N- (p-toluenesulfonyl) -N'-3- (p-toluenesulphonyl-oxy-phenyl) -urea (PF201) has the particular advantage that the writing performance is good even with prolonged storage.
• N- (2- (3-phenylureido) phenyl) benzenesulfonamide (NKK 1304), since its use leads to an even better writing performance even on prolonged storage.
• the sulfonyl urea and / or the compound of formula (I) are preferably present in an amount of from about 5 to about 40 weight percent, more preferably in an amount of from about 10 to about 25 weight percent, based on the total Solids content of the heat-sensitive layer, before. If the quantity of color developer drops below 5% by weight, this has the disadvantage that the writing power is no longer given. If the amount of 40% by weight of color developer is exceeded, this has the disadvantage that the economy suffers without the writing performance still appreciably increasing.
• the color former is preferably a triphenylmethane-type, fluoran-type, azaphthalide-type and / or fluorene-type dye.
• a most preferred color former is a fluoran-type dye, because of its availability and balanced application properties, it enables the provision of a recording material with an attractive price / performance ratio.
• the at least one color former is preferably present in an amount of from about 2 to about 20 weight percent, preferably from about 5 to about 15 weight percent, based on the total solids content of the heat-sensitive layer.
• a further color former is present, this is preferably present in an amount of from 0.5 to 5% by weight, based on the total solids content of the heat-sensitive layer.
• the self-adhesive thermosensitive recording material of the present invention may contain conventional additives such as sensitizers, stabilizers, binders, release agents and / or brighteners in the heat-sensitive color-forming layer.
• suitable sensitizing agents are substances whose melting point is between about 90 and about 150 ° C. and which in the molten state dissolve the color-forming components (color former and color developer) without disturbing the formation of the color complex.
• the sensitizer is a fatty acid amide such as stearamide, behenamide or palmitamide, an ethylene-bis-fatty acid amide such as N, N'-ethylene-bis-stearic acid amide or N, N'-ethylene-bis-oleic acid amide, a wax such as polyethylene wax or Montan wax, a carboxylic acid ester such as dimethyl terephthalate, dibenzyl terephthalate, benzyl p-benzyloxybenzoate, di (p-methylbenzyl) oxalate, di (p-chlorobenzyl) oxalate or di (p-benzyl) oxalate, an aromatic ether such as 1, 2-diphenoxy-ethane, 1,2-di (3-methylphenoxy) ethane, 2-benzyloxynaphthalene or 1,4-diethoxynaphthalene, an aromatic sulfone, such as diphenylsulfone, and / or an aromatic ether
• fatty acid amides since they are inexpensive to purchase.
• the stabilizer is preferably sterically hindered phenols, more preferably 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexyl-phenyl) -butane, 1,1,3-tris ( 2-methyl-4-hydroxy-5-tert-butylphenyl) -butane, 1,1-bis (2-methyl-4-hydroxy-5-tert-butyl-phenyl) -butane.
• At least one binder is present in the heat-sensitive color-forming layer.
• These are preferably water-soluble starches, starch derivatives, methylcellulose, hydroxyethylcellulose, carboxymethylcelluloses, partially or fully saponified polyvinyl alcohols, chemically modified polyvinyl alcohols or styrene maleic anhydride copolymers, styrene-butadiene copolymers, acrylamide (meth) acrylate copolymers, acrylamide acrylate Methacrylate terpolymers, polyacrylates, poly (meth) acrylic esters, acrylate-butadiene copolymers, polyvinyl acetates and / or acrylonitrile-butadiene copolymers.
• At least one release agent (anti-sticking agent) or lubricant is present in the heat-sensitive color-forming layer.
• These agents are preferably fatty acid metal salts, such as zinc stearate or calcium stearate, or else behenate salts, synthetic waxes, for example in the form of fatty acid amides such as stearic acid amide and behenic acid amide, fatty acid alkanolamides such as stearic acid methylolamide, paraffin waxes of various melting points, ester waxes different molecular weights, ethylene waxes, propylene waxes of different hardnesses and / or natural waxes, such as carnauba wax or montan wax.
• fatty acid metal salts such as zinc stearate or calcium stearate, or else behenate salts
• synthetic waxes for example in the form of fatty acid amides such as stearic acid amide and behenic acid amide, fatty acid alkanolamide
• optical brighteners may be incorporated in the heat-sensitive color-forming layer. These are preferably stilbenes.
• the area coat weight of the (dry) heat-sensitive color-forming layer of the self-adhesive heat-sensitive recording material of the present invention is preferably about 1 to about 10 g / m 2 , more preferably about 2 to about 6 g / m 2 . If a surface application weight of 1 g / m 2 is exceeded, this has the disadvantage that no functionality is given. If a surface application weight of 10 g / m 2 is exceeded, this has the disadvantage that this is uneconomical and negative properties, such as dropping the print head, increase.
• the siliconized layer of the self-adhesive heat-sensitive recording material according to the invention comprises a mixture of at least two siloxanes. Preference is given to a mixture of at least two acrylic-poly (organo) siloxanes. Examples of very particularly preferred siloxanes are siloxanes which are known under the trade names TEGO®RC902 and TEGO®RC711 (both from Evonik, Germany).
• the surface coverage of the siliconized layer is about 0.3 to about 2.5 g / m 2 , preferably about 0.5 to about 1.5 g / m 2 , and most preferably about 0.6 to about 1.0 g / m 2 . If a surface application weight of 0.3 g / m 2 is exceeded, this has the disadvantage that the release effect is no longer present. If a surface application weight of 2.5 g / m 2 is exceeded, then This has the disadvantage that the economy decreases and the risk of deposits on the thermal head of the printer increases.
• the siliconized layer is preferably anhydrous. It is also preferable that the siliconized layer does not contain Pt catalysts.
• the siliconized layer preferably contains an initiator, more preferably a photoinitiator. This serves for free radical curing of the silicone. This is very particularly preferably the TEGO® photoinitiator A18 (from Evonik, Germany).
• the siliconized layer may preferably contain further additives, such as matting agents and / or adhesion additives.
• the adhesive layer applied on the side of the carrier material facing away from the heat-sensitive color-forming layer comprises at least one adhesive, preferably a hotmelt adhesive.
• the hotmelt adhesive is a hot melt adhesive based on rubber and / or acrylate.
• hot-melt adhesives examples are known under the trade names TLH4280E (Bostik), PS8746 (Henkel / Technomelt), PS1212 (Novamelt) and / or L1945 (Collano).
• the surface application weight of the adhesive layer is preferably about 10 to about 40 g / m 2 , more preferably about 12 to about 25 g / m 2 . If a surface application weight of 10 g / m 2 is exceeded, this has the disadvantage that the adhesive effect no longer exists. If a surface application weight of 40 g / m 2 is exceeded, this has the disadvantage that the cost-effectiveness decreases and the risk of adhesion of deflection rollers and cutting blades in label dispensers increases.
• the self-adhesive heat-sensitive recording material according to the invention is unsupported, the at least one color developer is a sulfonylurea and the platelet-shaped pigment is a prankkaolin.
• the sulfonyl urea is present in an amount of from about 5 to about 40 percent by weight, based on the total solids content of the heat-sensitive Shift, in front.
• the flaky pigment in this most preferred embodiment is present in an amount of from about 5 to about 60 percent by weight, based on the total solids content of the heat-sensitive layer.
• the self-adhesive heat-sensitive recording material according to the invention is unsupported, the at least one color developer N- (2- (3-phenylureido) phenyl) benzenesulfonamide and the platelet-shaped pigment is a prankkaolin.
• the amounts of N- (2- (3-phenylureido) phenyl) benzenesulfonamide and platelet kaolin used in this embodiment are also about 5 to about 40 wt% and about 5 to about 60 wt%, respectively.
• the self-adhesive thermosensitive recording material of the present invention can be obtained by known production methods.
• the production method of the present invention is characterized in that an aqueous suspension containing the starting materials of the heat-sensitive color-forming layer is applied to a support substrate and dried, then the heat-sensitive color-forming layer is siliconized, and an adhesive layer is applied to the side of the support substrate remote from the heat-sensitive color-forming layer ,
• the self-adhesive heat-sensitive recording material of the present invention is obtained by a method of applying and drying an aqueous suspension containing the starting materials of the heat-sensitive color-forming layer to a support substrate, the aqueous application suspension having a solid content of about 20 to about 75% by weight. , preferably from about 25 to about 50% by weight, coated and dried by the curtain coating process at an operating speed of the coater of at least about 400 m / min, the heat-sensitive color-forming layer is subsequently siliconized, and that on the the heat-sensitive color-forming layer facing away from the carrier substrate, an adhesive layer is applied.
• This method is particularly advantageous from an economic point of view.
• the setting of the operating speed of the coater to at least about 400 m / min has both economic and technical advantages.
• the operating speed is particularly preferably at least about 750 m / min, very particularly preferably at least about 1000 m / min and very particularly preferably at least about 1500 m / min. It was particularly surprising that even at the latter speed, the resulting heat-sensitive recording material is impaired in any way, and that the operation is carried out optimally even at this high speed.
• the aqueous deaerated application suspension has a viscosity of about 100 to about 1000 mPas (Brookfield, 100 rpm, 20 ° C.). If the value of about 100 mPas is exceeded or exceeded the value of about 1000 mPas, then this leads to a poor runnability of the coating on the coating unit. More preferably, the viscosity of the aqueous deaerated application suspension is about 150 to about 700 mPas.
• the surface tension of the aqueous application suspension can be adjusted to about 30 to about 60 mN / m, preferably about 35 to about 50 mN / m (measured according to the static ring method according to Du Noüy, DIN 53914) ,
• the formation of the heat-sensitive color-forming layer can be done on-line or in a separate coating process off-line. This also applies to any subsequently applied layers or intermediate layers.
• the dried heat-sensitive color-forming layer is subjected to a smoothing action. It is advantageous here to adjust the Bekk smoothness, measured to DIN 53101, to about 150 to about 1500 seconds, preferably to about 250 to about 800 seconds.
• the present invention also relates to a self-adhesive thermosensitive recording material obtainable according to the above-described method of the present invention.
• the present invention further includes a process for producing a semifinished product characterized by applying and drying, on a supporting substrate, an aqueous suspension containing the starting materials of the heat-sensitive color-forming layer.
• the semi-finished product according to the invention is therefore analogous to the invention self-adhesive thermosensitive recording material produced, but still without subsequent siliconization and application of the adhesive layer.
• the present invention also encompasses the use of a semi-finished product comprising a carrier substrate, a heat-sensitive color-forming layer applied on one side of the carrier substrate, comprising at least one color developer and at least one color former for the preparation of a self-adhesive thermosensitive recording material as described above.
• thermosensitive recording material of the present invention is well suited for POS (point-of-sale) and / or label applications. It Also suitable for the production of stickers, labels and luggage tag trailers.
• the application of an aqueous application suspension for forming the heat-sensitive color-forming layer of a heat-sensitive recording paper was carried out on a laboratory scale by means of a bar blade on one side of a thermal base paper of 69 g / m 2 . After drying, a thermal recording sheet was obtained.
• the application amount of the heat-sensitive color-forming layer was from 4.0 to 4.5 g / m 2 .
• the aqueous application suspension was applied to a paper web having a basis weight of 64 g / m 2 by means of the curtain-coating process.
• the viscosity of the aqueous application suspension was 170-570 mPas (according to Brookfield, 100 rpm, 20 ° C.) (in the deaerated state).
• the coating was arranged in-line.
• the curtain coating process was operated at a speed of 450 m / min.
• the drying process of the coated paper support was carried out in a customary manner.
• the basis weight of the dry heat-sensitive layer was 4.0-4.5 g / m 2 .
• the following formulations were prepared by first mixing the dispersions A1, A2, B and C separately by milling the ingredients in a bead mill and then mixing these dispersions well together with the other components.
• BASF optical brightener (31.3%) 2.88 Blankophor PT anionic stilbene derivative PVA highly viscous, highly saponified (10%) 330 Poval 28-99, Kuraray polyvinyl alcohol Crosslinker, glyoxal based (42%) 11.29 Cartabond type, company Archroma rheology aids 0.83 Sterocoll type, BASF Polyacrylamide anionic modified Recipe 2b component Parts by weight Comment / trade name chem.
• BASF optical brightener (31.3%) 2.88 Blankophor PT anionic stilbene derivative PVA highly viscous, highly saponified (10%) 330 Poval 28-99, Kuraray polyvinyl alcohol Crosslinker, glyoxal based (42%) 11.29 Cartabond type, company Archroma rheology aids 0.83 Sterocoll type, BASF Polyacrylamide anionic modified Recipe 3 component Parts by weight Comment / trade name chem.
• BASF optical brightener (31.3%) 1.85 Blankophor PT anionic stilbene derivative PVA highly viscous, highly saponified (10%) 290 Poval28-99 polyvinyl alcohol Crosslinker, glyoxal based (42%) 9.94 Cartabond type, company Archroma rheology aids 1.61 Sterocoll type, BASF Polyacrylamide anionic modified
• TEGO RC902 For siliconization, a mixture of 50 parts TEGO RC902, 25 parts TEGO RC711 and 25 parts TEGO RC1772 (as matting agent) was prepared, plus 3 to 5 parts SR9051 as adhesion additive and 1.5 parts photoinitiator A18 (manufacturer: Evonik, Germany; SR9051 from Sartomer, Archema Group).
• the siliconization of the heat-sensitive color-forming layer was carried out by means of a five-fold roller application with prior corona treatment.
• thermosensitive recording materials based on the order suspensions listed in Tables 1 to 5 were unsupported and evaluated as described below. The results are shown in Tables 6 and 7.
• thermosensitive recording material siliconized on the upper side i.e., directly on the thermal reaction layer
• hot melt adhesives to simulate a roll winding (i.e., adhesive influence from the top and bottom).
• the adhesives used were Technomelt PS 8746 (Henkel) and Collano L1 945 (Collano). These were already coated on a carrier film available.
• the respective adhesive film was first laminated to the back of the thermal paper at room temperature and then thermally printed on a Atlantek 200 thermal printer, a checkerboard pattern with 10 energy gradings. From the printed image, the image density (optical density, OD) was measured by means of a SpectroEye Densitometer (X-Rite).
• the method used allows the determination of the force required to peel the release paper from the adhesive-coated facing. This allows for pre-evaluation of processing performance - very low values result in premature peel-off of labels during the manufacturing or dispensing process - high values lead to tearing in the punched grid deduction or dispensing problems with automatic dispensing.
• the slow release force is the force required to peel off a self-adhesive coated material from its release paper (or, conversely, the release liner from the self-adhesive material) at an angle of 180 ° and a nip speed of 300 mm / min.
• test strips were stored for 20 hours at 23 ⁇ 2 ° C between two flat metal plates under a pressure of 6.86 kPa (70 g / cm 2 ). This creates a good contact between release material and adhesive. After pressure bearing, the strips were removed between plates and conditioned for a minimum of four hours under standard conditions (23 ⁇ 2 ° C and 50 ⁇ 5% RH) prior to measurement.
• This test method allows a fast and accurate determination of the amount of silicone in a release coating with minimal sample preparation.
• the release coating is on a backing material such as is used to make release liners for self-adhesive labels or other release applications.
• the staining was rated on a scale from + to ++++, where ++++ represents a complete staining of the base paper, as in the base paper, and + a perfect color test with no apparent penetration.
• Table 6 Results of separation value determination and storage stability silicone order cutpoints cutpoints Write power% 60 ° C / 50% RH No. recipe (tesa 7475) (tesa 7476) Acrylatband Kautschukband Technomelt PS8746 Collano L1 945 (g / m 2 ) CN / in CN / in 1 week. 2 weeks. 4 weeks. 1 week. 2 weeks. 4 weeks. 1.
• Rec.1a (BPA and PCC) 0.84 splinted - - - n.b., blocked - - - Second Rec.1a (BPA and PCC) 1.34 509 355 - - - - - - Third Rec.1a (BPA and PCC) 1.05 966 464 - - - - - - 4th Rez.1b (BPA and kaolin) 0.75 35 - - - 37.4 - - - 5th Rez.1b (BPA and kaolin) 1.45 5 46 - - - - - - 6th Rez.1b (BPA and kaolin) 1.10 6 51 - - - - - 7th Ricoh Topcoat 150 UTB 0.78 9 - - - - - - - 7th Ricoh Topcoat 150 UTB 0.78 9 - - - - 98.7 - - - 8th.
• the formulations 7 and 8 correspond to a self-adhesive thermosensitive recording material on a carrier material (TopCoat) according to the prior art (manufacturer Fa. Ricoh, paper type 150 UTB).
• the formulations 9 to 12 are embodiments of the invention. Table 7: Results Methylene blue test No.
• the heat-sensitive recording material according to the invention has very good release values with medium silicone coating, very good writing performance even after storage for 4 weeks at 60 ° C. and 50% relative humidity. Moisture shows and is very easy siliconisable, which is reflected in the very low blue color after the methylene blue test.

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• Inorganic Chemistry (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
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• 2016
  • 2016-03-14 EP EP16160117.4A patent/EP3219507A1/de active Pending
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