JPH01180381A - Thermal recording sheet - Google Patents
Thermal recording sheetInfo
- Publication number
- JPH01180381A JPH01180381A JP63005405A JP540588A JPH01180381A JP H01180381 A JPH01180381 A JP H01180381A JP 63005405 A JP63005405 A JP 63005405A JP 540588 A JP540588 A JP 540588A JP H01180381 A JPH01180381 A JP H01180381A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- recording sheet
- particles
- sensitive
- zno
- 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.)
- Pending
Links
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000004040 coloring Methods 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000010419 fine particle Substances 0.000 abstract description 5
- 238000002834 transmittance Methods 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 abstract 1
- 238000001454 recorded image Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- KJCVRFUGPWSIIH-UHFFFAOYSA-N 1-naphthol Chemical compound C1=CC=C2C(O)=CC=CC2=C1 KJCVRFUGPWSIIH-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- -1 and if necessary Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 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
- B41M5/40—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
-
- 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
- B41M5/46—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 characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は感熱ヘッドを用いて記録を行う感熱記録シート
に関する。
〔従来の技術〕
この種、感熱記録シートは加熱によって発色画像を形成
するものであるが、記録方式が簡単および印字品質が良
効であることなど、種々の分野で広範囲に使われている
。この種感熱記録シートとしては例えば、無色または淡
色のロイコ染料等の発色性物質とこの発色性物質を熱特
発色させるためのホウ酸、酒石酸等の酸性物質又はナフ
トール、レゾルシン等のフェノール性物質等の顕色性物
質および結着剤さらには、必要に応じて炭酸カルシウム
などの顔料、ワックス類、消泡剤など、の添加剤を適当
な溶剤を用いて混合し、感熱塗液を形成し、例えばシー
ト状支持体に〜１０ｇ／ｍ”の量が塗布されている。
しかしながら、この種の感熱記録シートはポリ塩化ビニ
ールなどのプラスチックあるいは指紋、蛍光ペン等によ
りたやすく消色し°たり、又はアルコールなどの有機溶
剤などで未発色部がたやすく発色し、いわゆる保存安定
性が不十分であった。
このため、保存安定性を向上させるための種々の方策が
講じられてきた。この方策の代表的なものとしては、上
述のようにして形成した感熱発色層をおおう保護層（オ
ーバーコート層）を設けている。このような保護層を設
けることにより、発色部の退色あるいは未発色部の発色
などを防止する耐溶剤性の向上あるいはサーマルへラド
等の保護性能の向上が計られてきた。
〔発明が解決しようとする問題点〕 。
しかしながら、上述したような感熱記録シートの発色部
を退色させる要因として、前述した溶剤の他に光特に紫
外線によるものがある。
例えば、上述のようにして形成した感熱記録紙に所定の
印字を行い直射光を照射した場合、経時的に大きく退色
し、長時間経過後では判読が不可能になる欠点があった
。
これは、光特に紫外線により、発色成分等に影響を及ぼ
すためである。
〔問題点を解決するための手段〕
このため、この発明においては、紫外線を遮断するため
、極めて微粒子に形成したＺｎＯ粒子を用いたものであ
る。
そして、このための手段としてこのＺｎＯ粒子を含有す
る紫外線遮断層を感熱発色層上に形成するかあるいは、
感熱発色層に直接このＺｎＯ粒子を分散させた。
〔作用〕
ＺｎＯ粒子はその粒径が０．０１ μｎ〜０．１ ｕｎ
の極めて微細に形成されているため、塗膜形成あるいは
発色層中に混合した場合、紫外線は遮断するが可視光線
は良効に通す。本発明によれば、光の透過率は約８０％
であり、記録された印字を良効に視認する。
〔実施例〕
以上のように、本発明はＺｎＯ微粒子により紫外線を効
率よく遮断し、耐光性を向上している。
以下、実施例および比較例を示し、本発明の詳細な説明
する。
まず、本発明の第１の実施例について説明する。
上記したＡ液、Ｂ液、Ｃ液およびポリビニルアパコール
をそれぞれ１：４：１：２の割合で混合し、感熱清液と
し、市販の上質紙上に塗布しまず感熱発色層を形成した
。
次に粒径０．０１ ｕｍ〜ｏ、ｌ １１ｍのＺｎＯ粒子
３０重量部、５％ポリビニルアルコール水溶液１００重
量部を混合し、塗液とし、この塗液を上述した感熱発色
層上に塗布し本発明により感熱記録シート（実施例）を
得た。
次に本発明の第２の実施例について説明する。
ゝ水 ９０重量部上記
したＡ液、Ｂ液、Ｃ液およびポリビニルアパルコールを
それぞれ１：４：１：２の割合で混合し感熱塗液を形成
し、市販の上質紙上に塗布し、本発明による感熱記録シ
ート（実施例２）を形成した。
なお、上記した実施例の比較例として、ＺｎＯ粒子を除
いた上述したとほぼ同様の方法で形成した感熱記録シー
トを用いた。
試験
上述した３つの感熱記録シートそれぞれについて熱ペン
レコーダにより印字した。
次に、それぞれ印字された感熱記録シートを蛍光灯（５
０００ｗａｔｔ）で１００時間照写し、退色の度合いを
測定した。
この測定結果を図に示す。
〔発明の効果〕
以上、説明したようにＺ ｎ Ｏ９粒子を感熱記録紙上
に分散あるいは塗膜形成したので紫外線を遮断し、耐光
性のある感熱記録シートを形成することができる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat-sensitive recording sheet on which recording is performed using a heat-sensitive head. [Prior Art] This type of heat-sensitive recording sheet forms a colored image by heating, and is widely used in various fields because of its simple recording method and good print quality. This type of heat-sensitive recording sheet includes, for example, a color-forming substance such as a colorless or light-colored leuco dye, an acidic substance such as boric acid or tartaric acid, or a phenolic substance such as naphthol or resorcinol to cause the color-forming substance to develop a specific color under heat. A color developing substance and a binder, and if necessary, additives such as pigments such as calcium carbonate, waxes, antifoaming agents, etc. are mixed using a suitable solvent to form a heat-sensitive coating liquid, For example, a sheet-like support is coated with an amount of ~10 g/m''.However, this type of heat-sensitive recording sheet is easily discolored by plastics such as polyvinyl chloride, fingerprints, highlighters, etc. Uncolored areas easily develop color with organic solvents such as alcohol, resulting in insufficient storage stability.For this reason, various measures have been taken to improve storage stability. Typically, a protective layer (overcoat layer) is provided to cover the heat-sensitive coloring layer formed as described above.Providing such a protective layer prevents discoloration of colored areas or uncolored areas. Efforts have been made to improve solvent resistance to prevent coloration, etc., or to improve protection against thermal radiation, etc. [Problems to be solved by the invention]. In addition to the above-mentioned solvents, factors that cause discoloration include light, especially ultraviolet rays.For example, if the heat-sensitive recording paper formed in the manner described above is printed in a prescribed manner and exposed to direct light, the color will fade significantly over time. However, there was a drawback that it became impossible to read after a long period of time. This is because light, especially ultraviolet light, affects the coloring components. [Means to solve the problem] For this reason, this method In the invention, ZnO particles formed into extremely fine particles are used to block ultraviolet rays.As a means for this purpose, an ultraviolet blocking layer containing these ZnO particles is formed on the heat-sensitive coloring layer, or ,
These ZnO particles were directly dispersed in the heat-sensitive coloring layer. [Function] ZnO particles have a particle size of 0.01 μn to 0.1 un
Because it is formed in extremely fine particles, when it is mixed into a paint film or coloring layer, it blocks ultraviolet rays but allows visible rays to pass through effectively. According to the invention, the light transmittance is about 80%
This allows the recorded print to be visually recognized with good effect. [Example] As described above, the present invention efficiently blocks ultraviolet rays using ZnO fine particles and improves light resistance. EXAMPLES Hereinafter, the present invention will be explained in detail by showing Examples and Comparative Examples. First, a first embodiment of the present invention will be described. The above-mentioned liquids A, B, C and polyvinyl apacol were mixed in a ratio of 1:4:1:2, respectively, to form a heat-sensitive liquid, which was coated on a commercially available high-quality paper to form a heat-sensitive coloring layer. Next, 30 parts by weight of ZnO particles with a particle size of 0.01 um to 11 m and 100 parts by weight of a 5% polyvinyl alcohol aqueous solution were mixed to form a coating liquid, and this coating liquid was applied onto the above-mentioned heat-sensitive coloring layer. A thermosensitive recording sheet (Example) was obtained according to the invention. Next, a second embodiment of the present invention will be described. 90 parts by weight of water The above-mentioned liquids A, B, C and polyvinyl aparcoal were mixed in a ratio of 1:4:1:2 to form a heat-sensitive coating liquid, which was coated on commercially available high-quality paper. A heat-sensitive recording sheet (Example 2) was formed. In addition, as a comparative example of the above-mentioned example, a heat-sensitive recording sheet formed by substantially the same method as described above except for the ZnO particles was used. Test Printing was performed using a thermal pen recorder on each of the three heat-sensitive recording sheets described above. Next, each printed heat-sensitive recording sheet was exposed to fluorescent light (5
000 watt) for 100 hours, and the degree of discoloration was measured. The measurement results are shown in the figure. [Effects of the Invention] As explained above, since the Z n O9 particles are dispersed or formed into a coating film on the heat-sensitive recording paper, it is possible to block ultraviolet rays and form a light-resistant heat-sensitive recording sheet.
図は本発明による感熱記録シートと比較例による感熱記
録シートの光により退色の度合いを示す説明図である。
特許出願人 グラフチック株式会社
Ｓ、ｖ 崎閤The figure is an explanatory diagram showing the degree of color fading caused by light in a heat-sensitive recording sheet according to the present invention and a heat-sensitive recording sheet according to a comparative example. Patent applicant: Graphic Co., Ltd. S, v Sakikan
Claims (2)
において、 前記感熱発色層上に粒径が０．０１μｍ〜０．１μｍの
ＺｎＯ粒子を含有する紫外線遮断層を設けたことを特徴
とする感熱記録シート。(1) A heat-sensitive recording sheet having a heat-sensitive coloring layer on a support, characterized in that an ultraviolet blocking layer containing ZnO particles having a particle size of 0.01 μm to 0.1 μm is provided on the heat-sensitive coloring layer. A thermosensitive recording sheet.
て、 前記感熱発色層に粒径が０．０１μｍ〜０．１μｍのＺ
ｎＯ粒子を分散せしめたことを特徴とする感熱記録シー
ト。(2) In a heat-sensitive sheet having a heat-sensitive coloring layer on a support, the heat-sensitive coloring layer contains Z having a particle size of 0.01 μm to 0.1 μm.
A heat-sensitive recording sheet characterized by dispersing nO particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63005405A JPH01180381A (en) | 1988-01-13 | 1988-01-13 | Thermal recording sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63005405A JPH01180381A (en) | 1988-01-13 | 1988-01-13 | Thermal recording sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01180381A true JPH01180381A (en) | 1989-07-18 |
Family
ID=11610231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63005405A Pending JPH01180381A (en) | 1988-01-13 | 1988-01-13 | Thermal recording sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01180381A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5804529A (en) * | 1996-05-10 | 1998-09-08 | Mitsubishi Paper Mills Ltd. | Heat-sensitive recording material and process for the production thereof |
-
1988
- 1988-01-13 JP JP63005405A patent/JPH01180381A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5804529A (en) * | 1996-05-10 | 1998-09-08 | Mitsubishi Paper Mills Ltd. | Heat-sensitive recording material and process for the production thereof |
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