EP2480415A1 - Wärmeempfindliches aufzeichnungsmaterial mit rückseitenbeschichtung - Google Patents
Wärmeempfindliches aufzeichnungsmaterial mit rückseitenbeschichtungInfo
- Publication number
- EP2480415A1 EP2480415A1 EP10728224A EP10728224A EP2480415A1 EP 2480415 A1 EP2480415 A1 EP 2480415A1 EP 10728224 A EP10728224 A EP 10728224A EP 10728224 A EP10728224 A EP 10728224A EP 2480415 A1 EP2480415 A1 EP 2480415A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- sensitive recording
- layer
- calcium carbonate
- recording material
- 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
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
- B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
Definitions
- the invention relates to a heat-sensitive recording material having a substrate carrying on its first side at least one heat-sensitive recording layer and on its second side a calcium carbonate-containing backcoat.
- the heat-sensitive recording layer has at least one dye precursor and at least one color acceptor, which react color-forming with one another under the action of heat.
- the desired back printing of a heat-sensitive recording material in offset and flexographic printing is the reason for the task in WO 99/14056 A 1 after a backside coating, compared to the substances used in offset and flexographic printing, in particular organic solvents, as well as Plasticizers, oils and fats has a good barrier effect.
- the backside coating of the known recording material comprises a mixture containing starch, a non-styrene or vinyl acetate acrylate copolymer having a film formation temperature less than 5 ° C and preferably less than 2 ° C and an alkaline catalyst such as calcium carbonate.
- the object of the present invention is therefore to provide the public with a heat-sensitive recording material with a backside coating available that is easy to print in offset and flexographic printing and also possible in inkjet printing without problems and in which the backside coating an extraordinarily print allowed for art reproduction.
- At least one heat-sensitive recording layer having at least one dye precursor and at least one color acceptor, the dye precursor and color acceptor reacting in a color-forming manner under the action of heat,
- the backside coating is formed at least two layers, wherein a first layer closer to the substrate and a second layer are applied more remote from the substrate, and
- the first layer contains a first calcium carbonate
- the second layer contains a second calcium carbonate different from the first calcium carbonate.
- the first layer of the backcoat layer contains as pigment, most preferably as a single pigment, a preferably natural calcium carbonate having an average particle size preferably in a range of 1, 35 ⁇ to 2.1 ⁇ , most preferably in a range of 1, 4 ⁇ to 1, 8 ⁇ .
- the mean particle size is determined by means of the device "Sedigraph 5100" from Micromeritics GmbH, Erftstrasse 54, 41238 Moenchengladbach, Germany
- 60% of the calcium carbonate particles should have a particle size smaller than 2 ⁇ m.
- styrene-butadiene latex As a binder of the first layer of the backcoat styrene-butadiene latex is preferred as, preferably complements with styrene-acrylate copolymer and Acrylesterpf ropf polymers.
- the second layer of the backside coating may be natural or particularly preferably precipitated calcium carbonate as the preferred single inorganic pigment with an average particle size preferably in a range from 0.85 ⁇ m to 1, 25 ⁇ m, very particularly preferably in a range from 0.9 ⁇ m to 1.2 ⁇ m.
- the mean particle size is determined by means of the Seigraph 5100.
- the mean particle size of the calcium carbonate of the first layer of the backside coating differs from the mean particle size of the calcium carbonate of the second layer of the backside coating In the first layer, preference is given to naturally ground calcium carbonate, and in the second layer, precipitated calcium carbonate is particularly preferred.
- the precipitated calcium carbonate which is particularly preferably used in the second layer of the backside coating, is also the particle shape, in which a platelet-like particle shape as advantageous for the subsequent gloss of the back and thus for a particularly convincing appearance of the back of the invention heat-sensitive recording material was detected.
- the second layer of the backcoat layer additionally contains, as pigment, preferably organic, so-called hollow-body pigments. It is particularly advantageous if the pigment mixture within the second layer of the backcoat to 10 to 80 wt .-%, preferably 35 to 50 wt .-% and most preferably from 38 to 45 wt .-% of organic and 90 to 20 wt .-%, preferably to 65 to 50 wt .-% and most preferably to 62 to 55 wt .-% of calcium carbonate, wherein the wt .-% on the total amount of pigment in the second layer of the backside coating Respectively.
- binder of the second layer of the backcoat a combination of (carboxy) methylcellulose and styrene-butadiene-latex is preferred, ideally supplemented by corn starch.
- Another possible binder for the second layer of the backside coating is polyvinyl alcohol.
- the basis weight of the first layer of the backcoat layer is preferably between 7 and 15 g / m 2, and more preferably between 8.5 and 11.5 g / m 2 .
- the basis weight of the second layer of the backcoat layer is preferably between 10 and 2 g / m 2 and more preferably between 6 and 3 g / m 2 .
- the order of the two layers can be done wet-on-wet with subsequent drying, as well as a possible application in which the first layer is applied and dried and only then carried out and drying the second layer. This option is preferred in view of the achieved gloss values.
- the back is calendered after application and drying of both layers, wherein
- a line pressure in a range of 1 10 to 180 bar at a temperature of the heat-sensitive recording material in the inlet of the calender of 30 ° C to 45 ° C.
- gloss values could be achieved which are in a preferred range of 60 to 90%, most preferably in a range of 70 to 90%, measured according to Tappi 450 or ISO 2813 with a reflection angle of 75 °.
- the heat-sensitive recording layer comprising at least one dye precursor and at least one color acceptor, wherein the dye precursor and color acceptor under the action of heat responsive color-forming with each other, according to a first embodiment, preferred as the color acceptor is at least 33 1/3 wt .-%, most preferably to 100 wt .-%, based on the total content of F a rb a PCU pto re oxen thermosensitive recording layer, N- (p-toluensulphonyl) -N '-3- (p-toluensulphonyl-oxy-phenyl) -urea on.
- the color acceptor then makes up to 32% by weight, but preferably in the range of 15 to 30% by weight, and more preferably 18 to 28.5% by weight, of the heat-sensitive recording layer out.
- N- (p-toluensulphonyl) -N '-3- (p-toluensulphonyl-oxy-phenyl) -urea which is available as Pergafast ® 201 from Ciba Specialty Chemicals Inc., is also represented as the following formula ( 1), although the two CH 3 end molecules are frequently omitted in the literature:
- the heat-sensitive recording layer of the heat-sensitive recording material instead of N- (p-toluenesulphonyl) -N ' -3- (p-toluenesulphonyl-oxy-phenyl) urea other color acceptors, in particular selected from the list, comprising: 2,2 bis (4- hydroxyphenyl) propane, 4 - [(4- (1 -methylethoxy) phenyl) sulfonyl] -phenol, 4-hydroxy-4 '- isopropoxydiphylsulfon, 4,4'-dihydroxy-diphenyl sulfone, 2,4'-dihydroxy-diphenyl sulfone, N- (2-hydroxyphenyl) -2 - [(4-hydroxyphenyl) thio] acetamide.
- the inventors recognized with reference to the stated object that the recording layer can include virtually all known dye precursors, and combinations of a plurality of dye precursors are also possible.
- dye precursors particular preference is given to:
- 3-dibutylamino-6-methyl-7-anilinofluoran is considered the most suitable dye precursor used singly or in combination with other dye precursors, preferably selected from the dye precursors mentioned above.
- the recording layer of the heat-sensitive recording material of the present invention may also preferably contain sensitizers having a melting point of preferably from 60 ° C to 180 ° C, more preferably having a melting point of from 80 ° C to 140 ° C, to increase the thermal responsiveness.
- Such sensitizers are, for example: benzyl p-benzyloxybenzoate, stearamide, N-methylol stearamide, p-benzylbiphenyl, 1,2-di (phenoxy) ethane, 1,2-di (m-methylphenoxy) ethane, Terphenyl, dibenzyl oxalate, benzyl naphthyl ether and diphenyl sulfone, with benzyl naphthyl ether, diphenyl sulfone, 1, 2-di (m-methylphenoxy) ethane and 1, 2-di (phenoxy) ethane are considered preferred.
- sensitizer is also valid 2- (2H-benzotriazol-2-yl) -p-cresol according to the following formula (2):
- Suitable binders for incorporation into the heat-sensitive recording layer are, for example, water-soluble binders such as starch, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, gelatin, casein, polyvinyl alcohols, modified polyvinyl alcohols, sodium polyacrylates, acrylamide-acrylate copolymers, acrylamide-acrylate-methacrylate Terpolymers, alkali salts of styrene-maleic anhydride copolymers or ethylene-maleic anhydride copolymers, which can be used alone or in combination with one another; also water-insoluble Latex binders such as styrene-butadiene copolymers, acrylonitrile-butadiene copolymers and methyl acrylate-butadiene copolymers are useful as binders for incorporation into the heat-sensitive recording layer.
- water-soluble binders such as starch, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, ge
- polyvinyl alcohol alone or in combination with acrylate copolymer, is considered to be a particularly preferred binder, which is incorporated in a proportion of from 12 to 27.5% by weight, based on the total weight of the recording layer, in the heat-sensitive recording layer.
- the coating composition for forming the heat-sensitive recording layer may further contain lubricants and release agents such as metal salts of higher fatty acids, for example, zinc stearate, calcium stearate and waxes such as paraffin. oxidized paraffin, polyethylene, polyethylene oxide, stearamides and castor wax.
- Further constituents of the recording layer are, for example, pigments, preferably inorganic pigments such as, for example, aluminum (hydr) oxide, silica and calcium carbonate, in which case calcium carbonate, preferably in an amount of from 10 to 45% by weight, based on the total weight of the recording layer, in the recording layer is to be included as being preferred.
- the basis weight of the heat-sensitive recording layer is preferably between 2.5 and 12 g / m 2 and more preferably between 3 and 6.5 g / m 2 .
- a brush for applying the heat-sensitive recording layer in particular, offer a doctor blade and (roll) doctor blade coater, curtain coater and air brush.
- the coating color used to form the recording layer is aqueous.
- the subsequent drying of the coating color can be done by means of microwave irradiation. Usually and proven it is just as much to supply heat, as happens by hot-air floatation dryer or contact dryer. Also conceivable is a combination of the listed dry processes.
- a pigmented intermediate layer is arranged between the heat-sensitive recording layer and the substrate of the heat-sensitive recording material according to the invention.
- the intermediate layer is applied in a preferred embodiment with leveling coating devices, such as, for example, roller coater, doctor blade or doctor blade coaters, the intermediate layer can also make a positive contribution to equalization of the substrate surface, thus increasing the amount of coating material necessarily to be applied to the substrate heat-sensitive recording layer reduced.
- leveling coating devices such as, for example, roller coater, doctor blade or doctor blade coaters
- the intermediate layer can also make a positive contribution to equalization of the substrate surface, thus increasing the amount of coating material necessarily to be applied to the substrate heat-sensitive recording layer reduced.
- For the basis weight of the intermediate layer a preferred range between 5 and 20 g / m 2 and even better between 7 and 12 g / m 2 has proven.
- inorganic oil-absorbing pigments are incorporated into the intermediate layer located between the recording layer and the substrate, these pigments can absorb the wax components of the heat-sensitive recording layer liquefied by heat from the thermal head in the case of typeface formation and thus promote a still safer and faster functioning of the heat-induced recording, which is why such embodiment is considered preferred.
- inorganic pigment for the pigmented intermediate layer is calcined kaolin, which is alone or in combination with other inorganic pigments selected from the list, comprising calcium carbonate, silica, bentonite and alumina, and especially boehmite integrated.
- the ratio between organic and inorganic pigment is a compromise of the effects caused by the two types of pigments, which is particularly advantageously dissolved when the pigment mixture to 5 to 30 wt .-% or better to 8 to 20 wt .-% of consists of organic and 95 to 70 wt .-% or better to 92 to 80 wt .-% of inorganic pigment.
- Pigment mixtures of different organic pigments are conceivable.
- Calcined kaolin although not limited to it, when mixed with organic pigments, is the preferred inorganic pigment.
- pigment mixtures of different inorganic pigments are also conceivable here.
- the pigmented intermediate layer contains at least one binder preferably based on a synthetic polymer, wherein, for example, styrene-butadiene latex gives particularly good results.
- a synthetic binder with the admixture of at least one natural polymer, particularly preferably starch, is a particularly suitable embodiment.
- a binder to pigment ratio within the pigmented intermediate layer between 3: 7 and 1: 9, in each case based on wt .-%, a particularly suitable embodiment is present.
- a protective layer is preferably applied on the heat-sensitive recording layer. It is considered to be particularly preferred if the protective layer comprises at least 60% by weight, based on the total amount of binder in the protective layer, of diacetone-modified polyvinyl alcohol as binder.
- the protective layer of the heat-sensitive recording material according to the invention comprises, in addition to the diacetone-modified polyvinyl alcohol in a first possible embodiment, further binders, in particular mixtures of different carboxyl or silanol-modified polyvinyl alcohols. These then make up a maximum of 40 wt .-%, preferably at most 15 wt .-%, - based on the total amount of binder in the protective layer - from.
- the protective layer of the heat-sensitive recording material according to the invention has as binders exclusively diacetone-modified polyvinyl alcohol.
- diacetone-modified polyvinyl alcohol is the sole binder in the protective layer covering the heat-sensitive recording layer
- the binder content in the Protective layer in a range of 35 to 65 wt .-%, based on the total weight of the protective layer.
- Suitable crosslinking aids in the protective layer are in particular those which are selected from the group comprising: boric acid, polyamine, epoxy resin, dialdehyde, formaldehyde oligomers, epiochlorohydrin resin, adipic dihydrazide, dimethylurea, melamine-formaldehyde. It is also possible to use mixtures of different crosslinking aids.
- the ratio of the% by weight of the binder, in particular of the diacetone-modified polyvinyl alcohol, to the crosslinking aid in a range from 20: 1 to 5: 1 and particularly preferably in a range from 12: 1 to 7: 1.
- the protective layer additionally and preferably contains an inorganic pigment.
- the inorganic pigment is selected from the group comprising silica, aluminum hydroxide, bentonite, calcium carbonate, kaolin or a mixture of said inorganic pigments.
- roller coater, knife coater, curtain coater or air brush are particularly suitable as coating devices for applying the protective layer covering the heat-sensitive recording layer.
- the basis weight of the protective layer is preferably between 1, 0 and 3.0 g / m 2 and more preferably between 1, 6 and 2.3 g / m 2 .
- films and paper and here very particularly preferably a base paper with base sizing are suitable, but without being limited in any way.
- the substrate is a paper web with a proportion of recycled fibers of at least 70 wt .-%, based on the total pulp content in the paper web.
- a paper pulp of bleached eucalyptus pulps and softwood pulps is added together with water in a mixing chest. Further constituents of the pulp are also resin size for engine sizing with an amount of 0.6% by weight (atro), based on the total weight of the pulp, and optionally further customary additives, such as, for example, pigments and / or optical brighteners. After completion of the pulp this is then fed to a fourdrinier paper machine, where it is processed into a paper web with a basis weight of 69 g / m 2 .
- a heat-sensitive recording layer each having a basis weight of 4.8 g / m 2 .
- the coating composition to form the heat-sensitive recording layer - the same for all examples - the following recipe:
- N- (p-toluensulphonyl) -N '-3- (p-toluensulphonyl-oxy-phenyl) - urea according to formula (1), which is Pergafast ® 201 of Ciba Specialty Chemicals Inc. (color acceptor )
- BNE benzyl naphthyl ether
- the coating composition for the formation of the protective layer the same for all examples - the following recipe:
- a paper web produced in accordance with the descriptions of the previous paragraphs [0044] to [0047] is now provided with different backcoats with one or two uses of a roller doctor coater, so as to obtain samples of heat-sensitive recording materials for one of the two examples according to the invention to obtain the other of the four comparative examples.
- the following backside coatings are applied:
- Example 1 according to the invention second layer, order: 3.2 g / m 2 recipe ⁇
- Example 2 according to the invention second layer, application: 3.2 g / m 2 formulation ⁇
- Table 1 in conjunction with the two paragraphs [0049] and [0051], shows that only samples of examples 1 and 2 according to the invention have a two-layer backcoat whose two layers have different calcium carbonates.
- the difference between the calcium carbonates in the two layers is thus on the one hand in particular that the average particle size of the respective calcium carbonate in the two layers is different, namely in the first layer greater than in the second layer, and on the other with regard to the inventive example 1 in the first layer of natural calcium carbonate, in the second layer of precipitated calcium carbonate.
- Samples of Comparative Examples 1 and 4 have only a single-layer back coating, samples of Comparative Example 3 no back coating at all.
- the samples of Comparative Example 2 have a two-layer back coating, but the two layers have the same calcium carbonates.
- the calender used for this purpose has 2 nips with a central steel roller and two adjacent polymer rollers, with a line pressure of 150 bar in each Nip is set.
- the inlet temperature in the calender is measured at 36 ° C.
- the examples demonstrate the superiority of the backside coating according to the invention from at least two layers, wherein a first layer is applied closer to the substrate and a second layer more remote from the substrate, and
- the first layer contains a first calcium carbonate
- the second layer contains a second calcium carbonate, which is different from the first calcium carbonate.
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009041998 | 2009-09-21 | ||
PCT/EP2010/059258 WO2011032738A1 (de) | 2009-09-21 | 2010-06-30 | Wärmeempfindliches aufzeichnungsmaterial mit rückseitenbeschichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2480415A1 true EP2480415A1 (de) | 2012-08-01 |
EP2480415B1 EP2480415B1 (de) | 2013-08-14 |
Family
ID=42199274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10728224.6A Not-in-force EP2480415B1 (de) | 2009-09-21 | 2010-06-30 | Wärmeempfindliches aufzeichnungsmaterial mit rückseitenbeschichtung |
Country Status (3)
Country | Link |
---|---|
US (1) | US8637431B2 (de) |
EP (1) | EP2480415B1 (de) |
WO (1) | WO2011032738A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57146686A (en) | 1981-03-05 | 1982-09-10 | Ricoh Co Ltd | Thermal recording type label sheet |
SE500916C2 (sv) | 1986-06-16 | 1994-10-03 | Ricoh Kk | Termokänsligt registreringsmaterial med registreringsskikt innehållande fluorescensfärgämneskomposition |
JPS63209990A (ja) | 1987-02-27 | 1988-08-31 | Fuji Photo Film Co Ltd | 感熱記録紙 |
WO1999014056A1 (de) | 1997-09-12 | 1999-03-25 | Stora Spezialpapiere Gmbh | Wärmeempfindlicher aufzeichnungsbogen mit einer rückseitenbeschichtung, die stärke, ein acrylatcopolymer und einen alkalischen katalysator enthält |
-
2010
- 2010-06-30 EP EP10728224.6A patent/EP2480415B1/de not_active Not-in-force
- 2010-06-30 WO PCT/EP2010/059258 patent/WO2011032738A1/de active Application Filing
- 2010-06-30 US US13/497,232 patent/US8637431B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011032738A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011032738A1 (de) | 2011-03-24 |
EP2480415B1 (de) | 2013-08-14 |
US8637431B2 (en) | 2014-01-28 |
US20120225774A1 (en) | 2012-09-06 |
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