EP0402041B1 - Wärmeempfindliche Aufzeichnungsschicht - Google Patents

Wärmeempfindliche Aufzeichnungsschicht Download PDF

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Publication number
EP0402041B1
EP0402041B1 EP19900305927 EP90305927A EP0402041B1 EP 0402041 B1 EP0402041 B1 EP 0402041B1 EP 19900305927 EP19900305927 EP 19900305927 EP 90305927 A EP90305927 A EP 90305927A EP 0402041 B1 EP0402041 B1 EP 0402041B1
Authority
EP
European Patent Office
Prior art keywords
heat
sheet
color
dry
recording sheet
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.)
Revoked
Application number
EP19900305927
Other languages
English (en)
French (fr)
Other versions
EP0402041A1 (de
Inventor
Kenji Noguchi
Shigemi Iijima
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.)
New Oji Paper Co Ltd
Original Assignee
Oji Paper Co Ltd
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
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Application filed by Oji Paper Co Ltd filed Critical Oji Paper Co Ltd
Publication of EP0402041A1 publication Critical patent/EP0402041A1/de
Application granted granted Critical
Publication of EP0402041B1 publication Critical patent/EP0402041B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • B41M5/41—Base layers supports or substrates

Definitions

  • the present invention relates to a heat-sensitive recording sheet. More particularly, the present invention relates to a heat-sensitive recording sheet having a superior resistance to curling, even under variations of the ambient humidity, and a high heat-sensitivity.
  • Those heat-sensitive recording sheets are widely utilized for measurement recorders, terminal recorders of computers and communicators, facsimile printers and printers of automatic ticket vending machines.
  • the printers and recorders are provided with a heating element, for example, a thermal head or thermal pen, and colored images are produced on the recording sheet by imagewise heating the recording sheet through the heating element.
  • the heat-sensitive recording sheet must have a significantly enhanced heat-sensitivity, compared with conventional recording sheets.
  • the contents of the dye precursor, color-developing agent and sensitizing agent are increased, and the color-forming components in the recording sheet are fused and form a colored image upon heating by the heating elements of the recorder or printer.
  • the content of the color-forming components in the recording sheet is large, a portion of the fused components adheres to the heating element to form thermal head deposits thereon; the higher the total amount of color-forming components, the larger the amount of the thermal head deposits.
  • Thermal head deposits causes difficulties in the continuous supply of recording sheets, sticking of recording sheets, loud printing noises, and the formation of undesirable line-shaped stains and defective images.
  • fine inorganic particles for example, fine particles of calcium carbonate, magnesium carbonate, talc, clay, silica, calcium silicate or aluminum silicate are added to the heat-sensitive color-forming layer. Nevertheless, the addition of the inorganic particles does not completely prevent the formation of thermal head deposits from high heat-sensitive recording sheets having a large amount of color-forming component in the heat-sensitive color-forming layer.
  • the heat-sensitive recording sheet When a facsimile machine is used at home, the heat-sensitive recording sheet must have a high resistance to curling, because the facsimile machine is often used without air-conditioning and under an environment wherein the humidity varies over a wide range.
  • the substrate sheet in the recording sheet absorbs moisture and thus is elongated, whereas the heat-sensitive color-forming layer does not absorb moisture and is not elongated. Accordingly, the recording sheet curls inward so that the heat-sensitive color-forming layer forms an inside face of the curled sheet, and when tightly curled, the flat recording sheet assumes the shape of a cylinder.
  • the substrate sheet when the heat-sensitive recording sheet is exposed to a very dry atmosphere, the substrate sheet is becomes excessively dry and is shrunk in such a way that the recording sheet curls so that the substrate sheet forms an inside face of the curled recording sheet.
  • An object of the present invention is to provide a heat-sensitive recording sheet able to be employed without curling even in a non-air conditioned environment, a high humidity atmosphere or a very dry atmosphere, and having a satisfactory heat-sensitivity.
  • the heat-sensitive recording sheet of the present invention which comprises a substrate sheet and a heat-sensitive color-forming layer formed on at least one surface of the substrate sheet and comprising a substantially colorless dye precursor, a color-developing agent reactive with the dye precursor upon heating to develop a color, and a binder
  • the substrate sheet consisting essentially of a paper sheet produced from a dry pulp beaten to a freeness of from 250 ml to 550 ml, determined in accordance with the Canadian Standard Freeness (CSF) Test Method.
  • pulp is produced by delignifying (pulping) and bleaching a raw cellulosic material, for example, wood, bagasse, and rice straw.
  • a raw cellulosic material for example, wood, bagasse, and rice straw.
  • this type of pulp is referred to as a wet pulp or a slush pulp.
  • bleached pulp fibers are dried to provide a pulp sheet before supply to the paper-forming procedure, through a procedure in which the pulp sheet is preliminarily loosened in water to form a pulp slurry and then subjected to a beating procedure, this dried pulp is referred to as a dry pulp.
  • the substrate sheet must consist essentially of a paper sheet which has been produced from a dry pulp beaten to a freeness of from 250 ml to 550 ml determined in accordance with the Canadian Standard Freeness (CSF) Test Method.
  • CSF Canadian Standard Freeness
  • the above-mentioned specific substrate sheet of the present invention makes a great contribution to the exhibiting by the resultant heat-sensitive recording sheet of a superior resistance to curling and a high sensitivity to thermal color-formation.
  • the dry pulp fibers in the resultant paper sheet are brought into contact with each other at a relatively small number of contact points, in comparison with wet pulp fibers having a relatively low stiffness.
  • the pulp fibers in a usual machine-made paper sheet are orientated mostly in the longitudinal direction of the paper sheet.
  • the orientated pulp fibers are spaced from each other and are wetted with water, the expansion in the cross sectional area of the pulp fibers is absorbed by the gaps between the pulp fibers, and thus the paper sheet does not elongate in the transversal direction thereof.
  • the orientated pulp fibers are brought into intimate contact with each other in the paper sheet, the cross-sectional expansion of the wetted pulp fibers results in a certain elongation in the transversal direction of the paper sheet.
  • the dimensional change in the transversal direction of the paper sheet depends on the contacting conditions of the pulp fibers in the paper sheet. Namely, the dimensional change in the transversal direction of the paper sheet increases with an increase in the number of mutual contact points of the pulp fibers.
  • the dry pulp fibers in the paper sheet are brought into contact with each other at a relatively small number of contact points, in comparison with the wet pulp fibers in the paper sheet made therefrom, and thus the dimensional change in the transversal direction of the paper sheet when wetted or dried is relatively small in comparison with that of the wet pulp paper sheet.
  • the paper sheet made from the dry pulp is dimensionally stable even in a very wet or dry atmosphere.
  • a curling of a multiple layer sheet is caused by a difference in the dimensional changes of the front surface layer and the back surface layer.
  • both the substrate sheet and the heat-sensitive color-forming layer are dimensionally stable, even under a wet or dry condition, and thus the heat-sensitive recording sheet of the present invention exhibits a superior dimensional stability and a superior resistance to curling even under high humidity or dry conditions.
  • the heat-sensitive recording sheet of the present invention containing a substrate sheet made of a dry pulp exhibits a higher heat-sensitivity for thermal color formation than that made from a wet pulp, and the reasons for this high heat sensitivity are assumed to be as follows.
  • the total volume of the pores in the dry pulp paper sheet is larger than that in the wet pulp paper sheet.
  • the pores in the paper sheet effectively increase the thermal insulating property of the paper sheet.
  • the substrate sheet of the present invention having an enhanced thermal insulating property effectively prevents a useless diffusion of the heat through the substrate sheet layer, and therefore, the heat-sensitive recording sheet of the present invention exhibits a high heat-sensitivity for the thermal color-formation.
  • the dry pulp is beaten to a freeness (CSF) of 250 ml to 550 ml.
  • the resultant beaten dry pulp fibers are excessively entangled with each other, and the number of contacting points between the pulp fibers becomes undesirably large. Therefore, the resultant substrate sheet exhibits an increased dimensional change, particularly in the transversal direction, when wetted or dried, and a lower number of pores are formed among the pulp fibers, and thus the resultant heat-sensitive recording sheet does not have a satisfactory in the resistance to curling or a satisfactors heat-sensitivity.
  • the dry pulp is insufficiently beaten to a freeness (CSF) of more than 550 ml
  • CSF freeness
  • the number of the contacting points between the pulp fibers in the resultant paper sheet is excessively small, and the too many pores are formed the resultant paper sheet, and thus the resultant heat-sensitive recording sheet exhibits an unsatisfactory heat-sensitivity.
  • the excessively small number of contacting points of the pulp sheet and the excessive pores formed in the substrate sheet result in the following disadvantages.
  • the coating liquid for the heat-sensitive color-forming layer when a coating liquid for the heat-sensitive color-forming layer is applied to a surface of the porous substrate sheet by using a coating device consisting of a coating liquid-applying roller and backing rollers, the coating liquid easily permeates the porous substrating sheet and is deposited and accumulated on the backing rollers. Also, the porous substrate sheet has a poor mechanical strength, and thus is often broken during the coating operation.
  • the dry pulp to be formed as the substrate sheet of the present invention must have a freeness (CSF) of from 250 ml to 550 ml, preferably from 300 ml to 500 ml.
  • CSF freeness
  • the dry pulp usable for the present invention is selected from soft wood dry pulps (dry N pulps), hard wood dry pulps (dry L pulps), and mixtures of the dry N pulps and the dry L pulps.
  • the dry pulp may contain, as a minor component, a pulp recovered from waste paper.
  • the dry pulps may be separately beaten and the beaten dry pulps then mixed together, or the dry pulps may be mixed together and the mixture then subjected to the beating procedure.
  • the dry pulp may be blended with a small amount of a wet pulp, but in view of the object of the present invention, the amount of the wet pulp should be 20% or less, preferably 15% or less, based on the total weight of the dry pulp and the wet pulp.
  • the substrate sheet of the present invention optionally contains an additive comprising at least one member selected from the group consisting of dry paper strength reinforcers, for example, cationic starches, cationic polyacrylamides, and anionic polyacrylamides; sizing agents, for example, fatty acid salts, alkylketene dimer, alkenyl succinic acid, rosin, maleic acid-modified rosin, cationic sizing agents, and reactive sizing agents; fillers, for example, clay, talc, kaolin, and calcium carbonate; wet paper strength reinforcers, for example, melamine-formaldehyde resins and epoxidized polyamide resins; fixing agents, for example, aluminum sulfate and cationic starches; and pH-adjusting agents, for example, caustic soda and sodium carbonate.
  • dry paper strength reinforcers for example, cationic starches, cationic polyacrylamides, and anionic polyacrylamides
  • sizing agents for example, fatty acid
  • the substrate sheet is optionally tubsized or size-pressed by a treating liquid containing a water-soluble polymer, for example, polyvinyl alcohol or starch, or another polymeric material, for example, a SBR latex or stylene-maleic anhydride copolymer.
  • a water-soluble polymer for example, polyvinyl alcohol or starch
  • another polymeric material for example, a SBR latex or stylene-maleic anhydride copolymer.
  • the substrate sheet usable for the present invention preferably has a basis weight of from 30 to 200 g/m2.
  • At least one surface of the substrate sheet is coated with the coating liquid directly or through an intermediate layer comprising a pigment, a binder, and optionally, a surfactant, for example, a dispersant a waterproofing agent or a defoaming agent, and having a thickness of 1 to 15 »m.
  • a surfactant for example, a dispersant a waterproofing agent or a defoaming agent, and having a thickness of 1 to 15 »m.
  • the heat-sensitive color-forming layer comprises a substantially colorless dye precursor, a color-developing agent, and a binder.
  • the substantially colorless dye precursor can be selected from the leuco basic dyes usually employed for a conventional heat-sensitive color-forming layer, for example, triphenylmethane leuco dyes, triphenylmethanephthalide leuco dyes, fluoran leuco dyes, diphenylmethane leuco dyes, leuco Auramine, dyes, spiropyran leuco dyes, leuco indolyl dyes, and leuco indigo dyes.
  • the leuco basic dyes usually employed for a conventional heat-sensitive color-forming layer
  • the leuco basic dyes for example, triphenylmethane leuco dyes, triphenylmethanephthalide leuco dyes, fluoran leuco dyes, diphenylmethane leuco dyes, leuco Auramine, dyes, spiropyran leuco dyes, leuco indolyl dyes, and leuco indigo dyes.
  • the dye precursor are: crystal violet lactone, 3-(N-ethyl-N-isopentylamino)-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-(o-, and p-dimethylanilino)fluorans, 3-(N-ethyl-p-toluidino)-6-methyl-7-anilinofluoran, 3-pyrrolidino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-anilinofluoran, 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-anilinofluoran, 3-diethylamino-7-(o-chloroanilino)fluoran, 3-diethylamino-7-(m-trifluoromethylanilino)fluoran, 3-diethylamino-6
  • the dye precursor is usually present in the heat-sensitive color-forming layer in an amount of 5 to 20% by weight.
  • the color developing agent is usually present in the heat-sensitive color-forming layer in an amount of 10 to 40% by weight, and can be selected from conventional color developing agents.
  • the color-developing agent comprises at least one member selected from the group consisting of phenol compounds and organic acid compounds, for example, bisphenol A (2,2-bis(4-hydroxyphenyl)propane), p-hydroxybenzoic acid derivatives (Japanese Unexamined Patent Publication No. 52-140,483), phthalic acid derivatives, naphthoic acid derivatives bisphenol S, 4-hydroxy-4′-isopropyloxydiphenylsulfone (Japanese Unexamined Patent Publication No.
  • phenol compounds and organic acid compounds for example, bisphenol A (2,2-bis(4-hydroxyphenyl)propane), p-hydroxybenzoic acid derivatives (Japanese Unexamined Patent Publication No. 52-140,483), phthalic acid derivatives, naphthoic acid derivatives bisphenol S, 4-hydroxy-4′-isopropyloxydiphenylsulfone (Japanese Unexamined Patent Publication No.
  • the heat-sensitive color-forming layer of the present invention contains a binder in an amount of 5% to 20% by weight.
  • the binder can be selected from conventional binders and preferably comprises at least one member selected from the group consisting of water-soluble polymeric materials, for example, polyvinyl alcohols having various molecular weights; starch and derivatives thereof; cellulose derivatives, for example, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, methylcellulose and ethylcellulose; and water-soluble synthetic polymeric materials, for example, sodium polyacrylate, polyvinylpyrrolidone, acrylamide-acrylic acid ester copolymers, acrylamide-acrylic acid ester-methacrylic acid terpolymers, styrene-maleic anhydride copolymer sodium salts, polyacrylamide, sodium alginate, gum arabic, geratine, and casein; and latexes of water-insoluble polymeric materials, for example, polyvinyl acetate, poly
  • the heat-sensitive color-forming layer of the present invention optionally contains an additional heat fusible sensitizing agent consisting of at least one conventional heat-fusible substance having a melting point of from 80°C to 110°C, for example, phenyl 1-hydroxy-2-naphthoate, p-benzyl-biphenyl, benzyl naphthyl ether or dibenzylterephthalate.
  • the additional sensitizing agent is preferably contained in an amount of 5 to 20%, based on the weight of the color developing agent.
  • the heat-sensitive color-forming layer of the present invention optionally further contains 10 to 50% by weight of a white pigment comprising fine particles of at least one member selected from inorganic pigments, for example, calcium carbonate, silica, zinc oxide, titanium dioxide, aluminum hydroxide, zinc hydroxide, barium sulfate, clay, calcined clay, talc, and surface-treated calcium carbonate and silica; and organic pigments, for example, urea-formaldehyde resins, styrene-methacrylic acid copolymers, and polystyrene.
  • inorganic pigments for example, calcium carbonate, silica, zinc oxide, titanium dioxide, aluminum hydroxide, zinc hydroxide, barium sulfate, clay, calcined clay, talc, and surface-treated calcium carbonate and silica
  • organic pigments for example, urea-formaldehyde resins, styrene-methacrylic acid copolymers, and polys
  • the heat-sensitive color-forming layer optionally also contains a defoaming agent for preventing the foaming of the coating liquid in the coating procedure, or a surface active agent for enhancing the coating property of the coating liquid.
  • the heat-sensitive color-forming layer of the present invention optionally furthermore contain 5 to 30% by weight of a wax substance as a lubricant, releasing agent or sensitivity-controlling agent which can be selected from conventional animal, vegetable and mineral wax materials, and preferably, comprises at least one member selected from, for example, paraffin waxes, microcrystalline waxes, polyolefin waxes, and carnouba wax, higher fatty acids, metal salts of higher fatty acids, and condensation products of higher fatty acids and amine compounds.
  • the heat-sensitive color-forming layer of the present invention is preferably in a dry weight of 1 to 15 g/m2 more preferably 2 to 10 g/m2.
  • a paper sheet having a basis weight of 45 g/m2 was prepared from a pulp slurry containing 0.5% by weight of a mixture of 20 parts by weight of a dry NBKP, 80 parts by weight of a dry LBKP, one part, by weight of rosin, and 2 parts by weight of aluminum sulfate, by a usual paper-forming method.
  • the dried pulp mixture was beaten to the freeness (CSF) as shown in Table 1.
  • An aqueous dispersion (A) of a dye precursor was prepared from the following composition:
  • Each of the dispersions (A) and (B) were separately treated in a sand grinder to pulverize the dye precursor particles and the color-developing agent particles to an average size of 1 »m.
  • the resultant dispersions (A) and (B) were mixed with other materials in the amounts as shown below, to provide a coating liquid for a heat-sensitive color-forming layer.
  • the coating liquid was coated on a surface of the substrate sheet to an extent such that, after drying and solidifying, the resultant dry coating layer had a weight of 7 g/m2, and thereafter, the coated liquid layer was dried to form a heat-sensitive color-forming layer, and thus a heat-sensitive recording sheet was obtained.
  • the recording sheet was treated by a super calender to smooth the surface of the heat-sensitive colorforming layer until it exhibited a Bekk smoothness of 800 seconds.
  • the resultant recording sheet was subjected to heat-sensitivity test procedures for thermal recording, and for the resistance thereof to curling, in the following manner.
  • the heat-sensitive color-forming layer of the recording sheet was locally heated by using a heat inclination tester (available from Toyo Seiki Co.) at a temperature of 120°C under a pressure of 2.5 kg/cm2 for 100 m seconds.
  • the color density of the resultant colored image was measured by a color density tester (available under a trademark of Macbeth Densitometer Tester RD-914, from Kollmorgen Co.).
  • the recording sensitivity of the recording sheet was represented by the measured value of the color darkness.
  • the measured darkness was 1.20 or more.
  • An A4-size test piece was prepared from the recording sheet in such a manner that the longitudinal side of the test piece was in parallel to the longitudinal direction of the recording sheet.
  • test piece was placed on a horizontal plate in such a manner that the heat-sensitive color-forming layer faced upward and left to stand under the conditions as shown in Table 1 for 10 minutes, to allow the test piece to freely curl.
  • test piece When placed in a dry, cool atmosphere at a temperature of 10°C and at a relative humidity (RH) of 20%, the test piece was curled outward so that the substrate sheet formed an inside surface of the curled test piece.
  • RH relative humidity
  • test piece When placed in a wet, hot atmosphere at a temperature of 35°C and at a relative humidity of 85%, the test piece was curled inward so that the heat-sensitive color-forming layer formed an inside face of the curled test piece.
  • Example 2 The same procedures as those mentioned in Example 1 were carried out except that the dry NBKP and the dry LBKP were beaten to a freeness (CSF) of 230 ml.
  • CSF freeness
  • Example 2 The same procedures as in Example 2 were carried out except that the dry NBKP was replaced by 20 parts by weight of a wet NBKP, the dry LBKP was replaced by 80 parts by weight of a wet LBKP, and these wet pulps were beaten to a freeness (CSF) of 380 ml.
  • CSF freeness

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (4)

  1. Wärmeempfindliche Aufzeichnungsfolie, welche aufweist:
       eine Substratfolie; und
       eine wärmeempfindliche, farbbildende Schicht, welche auf mindestens einer Oberfläche der Substratfolie gebildet ist und einen im wesentlichen farblosen Farbstoffvorläufer, ein bei Erwärmung mit dem Farbstoffvorläufer reaktives Farbentwicklungsmittel zur Entwicklung einer Farbe, sowie ein Bindemittel aufweist,
    wobei die Substratfolie im wesentlichen aus einem Papierbogen besteht, welcher aus einer Trockenpulpe zu einem gemäß dem CSF (Canadian Standard Freeness)-Prüfverfahren festgestellten Entwässerungsgrad von 250 bis 550 ml geschlagen wurde.
  2. Wärmeempfindliche Aufzeichnungsfolie nach Anspruch 1, wobei die geschlagene Trockenpulpe einen Entwässerungsgrad von 300 bis 500 ml aufweist.
  3. Wärmeempfindliche Aufzeichnungsfolie nach Anspruch 1, wobei die Substratfolie ein Gewicht von 30 bis 200 g/m² aufweist.
  4. Wärmeempfindliche Aufzeichnungsfolie nach Anspruch 1, wobei die Substratfolie einen Zusatz enthält, welcher mindestens ein Mitglied der aus Trockenpapier-Festigkeitsverstärkern, Schlichtemitteln, Füllmitteln und Feuchtpapier-Festigkeitsverstärkern bestehenden Gruppe umfaßt.
EP19900305927 1989-06-06 1990-05-31 Wärmeempfindliche Aufzeichnungsschicht Revoked EP0402041B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1142128A JPH0818463B2 (ja) 1989-06-06 1989-06-06 感熱記録紙
JP142128/89 1989-06-06

Publications (2)

Publication Number Publication Date
EP0402041A1 EP0402041A1 (de) 1990-12-12
EP0402041B1 true EP0402041B1 (de) 1994-06-22

Family

ID=15308031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900305927 Revoked EP0402041B1 (de) 1989-06-06 1990-05-31 Wärmeempfindliche Aufzeichnungsschicht

Country Status (3)

Country Link
EP (1) EP0402041B1 (de)
JP (1) JPH0818463B2 (de)
DE (1) DE69010084T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316402A (en) * 1991-12-13 1994-05-31 Tombow Pencil Co., Ltd. Penholder cap
DE10014351A1 (de) 2000-03-24 2001-09-27 Mitsubishi Hitec Paper Flensbu Aufzeichnungspapier zum rückseitigen Bedrucken

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869091A (ja) * 1981-10-22 1983-04-25 Fuji Photo Film Co Ltd 感熱記録紙用紙支持体
JPS62218183A (ja) * 1986-03-20 1987-09-25 Fuji Photo Film Co Ltd 感熱記録紙
JPS63203378A (ja) * 1987-02-19 1988-08-23 Fuji Photo Film Co Ltd 感熱記録紙
JPS63209990A (ja) * 1987-02-27 1988-08-31 Fuji Photo Film Co Ltd 感熱記録紙

Also Published As

Publication number Publication date
DE69010084D1 (de) 1994-07-28
JPH0818463B2 (ja) 1996-02-28
JPH039879A (ja) 1991-01-17
EP0402041A1 (de) 1990-12-12
DE69010084T2 (de) 1994-10-13

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R26 Opposition filed (corrected)

Opponent name: THE WIGGINS TEAPE GROUP LIMITED

Effective date: 19950313

Opponent name: STORA FELDMUEHLE AGFORSCHUNG UND ENTWICKLUNG

Effective date: 19950217