JPH089269B2 - Thermal recording material - Google Patents
Thermal recording materialInfo
- Publication number
- JPH089269B2 JPH089269B2 JP1129772A JP12977289A JPH089269B2 JP H089269 B2 JPH089269 B2 JP H089269B2 JP 1129772 A JP1129772 A JP 1129772A JP 12977289 A JP12977289 A JP 12977289A JP H089269 B2 JPH089269 B2 JP H089269B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- polystyrene
- undercoat layer
- heat
- recording
- 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.)
- Expired - Fee Related
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
-
- 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
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は感熱記録紙に関するものであり、更に詳しく
は熱応答性の良く、感熱ヘッドへの柏付着量の少ない高
感度感熱記録紙に関するものである。TECHNICAL FIELD The present invention relates to a thermal recording paper, and more particularly to a high-sensitivity thermal recording paper having good thermal response and a small amount of sticking to the thermal head. Is.
［従来の技術］ 感熱記録紙は一般に紙、プラスチックフィルム、合成
紙等の支持体上に結着剤や熱発色性物質を主成分とした
単層又は多層の感熱発色層を設けてなるものである。[Prior Art] A thermal recording paper generally comprises a single-layer or multi-layer thermosensitive coloring layer containing a binder or a thermochromic substance as a main component on a support such as paper, plastic film or synthetic paper. is there.
感熱記録紙は単に加熱するだけで発色画像が得られ、
又、記録装置が比較的簡単でコンパクトなものにするこ
とができるなどの利点が好まれ、各種情報記録紙として
広範囲に利用されている。A color image can be obtained by simply heating the thermosensitive recording paper,
Further, it is preferred that the recording apparatus can be made relatively simple and compact, and is widely used as various information recording sheets.
特に近年、かかる感熱記録体を用いる感熱ファクシミ
リ、感熱プリンターは装置上の改良が進み、従来は難し
かった高速記録が可能となっている。このような機器、
ハード分野の高速化に伴い、使用される感熱記録紙も記
録感度の向上が要求されこれに関する多くの提案がなさ
れている。In particular, in recent years, thermal facsimiles and thermal printers using such a thermal recording material have been improved in the apparatus, and high-speed recording, which has been difficult in the past, has become possible. Such equipment,
With the increase in speed in the field of hardware, the thermal recording paper used is also required to have improved recording sensitivity, and many proposals have been made regarding this.
これまで感熱記録紙の記録感度向上の為には下塗り層
により、支持体を平滑化するとと共に、断熱性を持たせ
ることが有効であるとされてきた。Up to now, it has been considered effective to improve the recording sensitivity of the thermal recording paper by smoothing the support and providing heat insulation with an undercoat layer.
その方法として、下塗り層中に無機顔料よりも熱伝導
率の低い疎水性高分子粒子を含有させる（特開昭59−20
4595号公報、特開昭60−3697号公報）とか、更に空気の
断熱性を加味する為、中空微粒子を下塗り層に含有させ
る（特開昭59−171685号公報、特開昭59−225987号公
報）ことが提案されている。しかし、これらの方法は、
記録感度向上には効果があるが、実用上記録感度と同じ
くらい重要なサーマルヘッドへの粕付着の点からは、不
充分な技術であった。As a method for this, hydrophobic polymer particles having a lower thermal conductivity than that of the inorganic pigment are contained in the undercoat layer (JP-A-59-20).
4595 and JP-A-60-3697), or in order to further add heat insulating properties to air, hollow fine particles are contained in the undercoat layer (JP-A-59-171685 and JP-A-59-225987). Gazette) is proposed. But these methods
Although effective in improving the recording sensitivity, it was an insufficient technique in terms of adhesion of lees to the thermal head, which is as important as the recording sensitivity in practical use.
そこで高吸油性の酸化ケイ素を疎水性高分子粒子と組
み合せた層を下塗り層として設け、サーマルヘッドへの
粕付着を防止することが提案されている（特開昭61−89
883号公報）。しかし、このような高吸油性の酸化ケイ
素を添加すると、感熱発色層の発色溶融成分の下塗り層
中への吸収が多くなって、画像のしずみがおきてしま
う。Therefore, it has been proposed to provide a layer in which highly oil-absorbing silicon oxide is combined with hydrophobic polymer particles as an undercoat layer to prevent the adhesion of lees to the thermal head (JP-A-61-89).
No. 883). However, when such highly oil-absorbing silicon oxide is added, the amount of the color-melting component of the heat-sensitive color-developing layer absorbed in the undercoat layer is increased, and the image becomes dull.
［発明が解決しようとする課題］ 従って、本発明は、高い記録感度をもち、しかも粕付
着を有効に防止し、しかも、高エネルギーで発色させた
時の画像のしずみを防ぐことができる感熱記録紙を提供
することを目的とする。[Problems to be Solved by the Invention] Accordingly, the present invention has a high recording sensitivity, can effectively prevent adhesion of lees, and can prevent bleeding of an image when colored with high energy. Intended to provide paper.
［課題を解決するための手段］ 本発明は、電子供与性無色染料と電子受容性化合物と
を含む感熱記録層を支持体上に設けた感熱記録シートに
おいて、支持体と感熱発色層との間に平均粒子径５μｍ
以下のポリスチレンと、吸油量が50ml/100g以上100ml/1
00g未満の範囲にある顔料とを重量で1/4〜4/1の割合で
含ませた下塗り層を設けたことを特徴とする感熱記録材
料に関するものである。[Means for Solving the Problems] The present invention provides a thermosensitive recording sheet having a thermosensitive recording layer containing an electron-donating colorless dye and an electron-accepting compound provided on a support, and between the support and the thermosensitive coloring layer. Average particle size of 5 μm
The following polystyrene and oil absorption of 50ml / 100g or more 100ml / 1
The present invention relates to a heat-sensitive recording material characterized by comprising an undercoat layer containing a pigment in the range of less than 00 g in a weight ratio of 1/4 to 4/1.
本発明者らは、研究の結果、感熱発色層の下に下塗り
層を設けポリスチレンを下塗り層の充填剤として使うこ
とにより、無機顔料を充填剤として使用した場合よりも
高い記録感度を得られることを知った。しかしながら、
ポリスチレンを単体で使用した場合は、粕吸収性が不足
しており、望ましい感熱記録材料とはいえない。そこで
粕吸収性を向上させるため無機顔料を混在させることに
より高い記録感度と高い粕吸収性を有する望ましい感熱
記録材料を得ることができた。The inventors of the present invention have found that by providing an undercoat layer under a thermosensitive coloring layer and using polystyrene as a filler for the undercoat layer, higher recording sensitivity can be obtained than when an inorganic pigment is used as a filler. I knew However,
When polystyrene is used alone, it cannot be said to be a desirable heat-sensitive recording material because of its insufficient absorbency of lees. Therefore, by mixing an inorganic pigment in order to improve the absorptivity, it was possible to obtain a desirable heat-sensitive recording material having a high recording sensitivity and a high absorptivity.
ポリスチレンは熱伝導率が高く、高い記録感度を得る
ことができる。ポリスチレンは平均粒径が５μｍ以下、
好ましくは0.5〜２μｍの微粒子状のものを使用すると
よい。５μｍを超える大粒径のものは、平滑度の高い下
塗り層を形成できない。なお、0.5μｍより小さい粒径
のものは、粕吸収性をより低下させる傾向があることを
考慮しなければならない。Polystyrene has high thermal conductivity and can obtain high recording sensitivity. Polystyrene has an average particle size of 5 μm or less,
It is preferable to use fine particles having a particle size of 0.5 to 2 μm. If the particle size is larger than 5 μm, an undercoat layer having high smoothness cannot be formed. It should be taken into consideration that particles having a particle size smaller than 0.5 μm tend to further reduce the absorbency of lees.
下塗り層中にポリスチレンに混合使用されるべき顔料
は吸油量が50ml/100g以上100ml/100g未満（JIS k5101）
のものである。このような顔料の例としては、焼成クレ
ー、炭酸カルシウム、炭酸マグネシウム等を挙げること
ができる。この場合、吸油量が100ml/100g以上となる
と、粕吸収性は向上するが、高エネルギーで印字した際
印字濃度の低下が生じ適切ではない。The pigment to be mixed with polystyrene in the undercoat layer has an oil absorption of 50 ml / 100 g or more and less than 100 ml / 100 g (JIS k5101)
belongs to. Examples of such pigments include calcined clay, calcium carbonate, magnesium carbonate and the like. In this case, if the oil absorption amount is 100 ml / 100 g or more, the residue absorbency is improved, but when printing with high energy, the print density is reduced, which is not appropriate.
前記ポリスチレンと前記顔料とは、一般に1:4〜4:1
（重量比）の範囲で混合して使用する。1:4よりも前記
吸油量範囲の顔料を多くすると高い記録感度を維持する
ことができず、4:1よりポリスチレンを多くすると高い
粕吸収性が維持できない。The polystyrene and the pigment are generally 1: 4 to 4: 1.
Used by mixing in the range of (weight ratio). When the amount of the pigment in the oil absorption range is more than 1: 4, the high recording sensitivity cannot be maintained, and when the amount of the polystyrene is more than 4: 1, the high lees absorbency cannot be maintained.
前記ポリスチレンと前記顔料から成る下塗り層を形成
する場合、接着剤を使用する。接着剤の使用量は、ポリ
スチレンと顔料との合計量100部に対し１〜20部（重量
比）とする。使用する接着剤としては、一般に公知の水
溶性高分子水性エマルジョッが用いられ、具体的には例
えば以下に示すようなものが挙げられる。An adhesive is used when forming an undercoat layer comprising the polystyrene and the pigment. The amount of the adhesive used is 1 to 20 parts (weight ratio) based on 100 parts of the total amount of polystyrene and pigment. As the adhesive to be used, generally known water-soluble polymer aqueous emulsion is used, and specific examples thereof include those shown below.
ポリビニルアルコール、メチルセルロース、ヒドロキ
シエチルセルロース、デンプン、デンプン誘導体、スチ
レン−無水マレイン酸共重合体、イソブチレン−無水マ
レイン酸共重合体、ポリアミド、SBRラテックス、ポリ
スチレン−アクリル酸エステルエマルジョン、ポリ酢酸
ビニルエマルジョン等。Polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose, starch, starch derivative, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, polyamide, SBR latex, polystyrene-acrylic acid ester emulsion, polyvinyl acetate emulsion and the like.
ここに説明したようにポリスチレン、前記吸油量範囲
の顔料、及び接着剤を任意の順序で水性媒体中に分散、
混合して塗液を作成し、この塗液を支持体上に塗布量が
乾燥重量として１〜15g/m2となるように塗工して下塗り
層を形成する。塗工は通常の塗工機を使用して行うこと
ができる。As described here, polystyrene, the pigment in the oil absorption range, and the adhesive are dispersed in an aqueous medium in any order,
A coating liquid is prepared by mixing, and the coating liquid is coated on a support so that the coating weight is 1 to 15 g / m 2 as a dry weight, to form an undercoat layer. The coating can be performed using a usual coating machine.
なお支持体は、紙、プラスチックフィルム、合成紙、
金属箔など適当な材質のものから選択することができ
る。The support is paper, plastic film, synthetic paper,
It can be selected from those made of an appropriate material such as metal foil.
このようにして設けた下塗り層上に、感熱発色層を形
成する。A thermosensitive coloring layer is formed on the undercoat layer thus provided.
感熱発色層は常法によって形成すればよい。無色又は
淡色を帯びた電子供与性染料としては次の如きものが使
用可能である。The heat-sensitive coloring layer may be formed by an ordinary method. The following can be used as the colorless or light-colored electron donating dye.
クリスタルバイオレットラクトン３−（Ｎ−エチル−
Ｎ−イソペンチルアミノ）−６−メチル−７−アニリノ
フルオラン、 ３−ジエチルアミノ−６−メチル−７−アニリノフル
オラン、 ３−ジエチルアミノ−６−メチル−７−（o,p−ジメ
チルアニリノ）フルオラン、 ３−（Ｎ−エチル−ｐ−トルイジノ）−６−メチル−
７−アニリノフルオラン、 ３−ピロリジノ−６−メチル−７−アニリノフルオラ
ン、 ３−ジブチルアミノ−６−メチル−７−アニリノフル
オラン、 ３−（Ｎ−シクロヘキシン−Ｎ−メチルアミノ）−６
−メチル−７−アニリノフルオラン、 ３−ジエチルアミノ−７−（ｏ−クロロアニリノ）フ
ルオラン、 ３−ジエチルアミノ−７−（ｍ−トリフルオロメチル
アニリノ）フルオラン、 ３−ジエチルアミノ−６−メチル−７−クロロフルオ
ラン、 ３−ジエチルアミノ−６−メチルフルオラン、 ３−シクロヘキシルアミノ−６−クロロフルオラン、 電子受容性化合物（顕色剤）としてはその代表例とし
て下記の化合物を挙げられる。Crystal violet lactone 3- (N-ethyl-)
N-isopentylamino) -6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7- (o, p-dimethylani Rino) Fluoran, 3- (N-ethyl-p-toluidino) -6-methyl-
7-anilinofluoran, 3-pyrrolidino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-anilinofluoran, 3- (N-cyclohexyne-N-methylamino ) -6
-Methyl-7-anilinofluorane, 3-diethylamino-7- (o-chloroanilino) fluorane, 3-diethylamino-7- (m-trifluoromethylanilino) fluorane, 3-diethylamino-6-methyl-7- The following compounds are mentioned as typical examples of chlorofluorane, 3-diethylamino-6-methylfluorane, 3-cyclohexylamino-6-chlorofluorane, and electron-accepting compounds (developers).
ビスフェノールＡ、 ｐ−ヒドロキシ安息香酸ベンジル、 ジ（４−ヒドロキシフェニル）酢酸ｎ−ブチル、 ビスフェノールＳ、 ４−ヒドロキシ−４′−イソプロピルオキシジフェニ
ルスルホン、 1,1−ジ（４−ヒドロキシフェニル）シクロヘキサ
ン、 1,7−ジ（ヒドロキシフェニルチオ）−3,5−ジオキサ
ヘプタン、 この外通常感熱発色層に含まれることのできる物質は
任意に含有させてよい。たとえば、いわゆる増感剤とし
ては、公知の融点50〜150℃の熱可融性有機化合物が一
般に用いられ、以下の代表例を列挙することができる。Bisphenol A, benzyl p-hydroxybenzoate, n-butyl di (4-hydroxyphenyl) acetate, bisphenol S, 4-hydroxy-4′-isopropyloxydiphenyl sulfone, 1,1-di (4-hydroxyphenyl) cyclohexane, 1,7-di (hydroxyphenylthio) -3,5-dioxaheptane, in addition to this, substances which can be usually contained in the heat-sensitive color developing layer may be optionally contained. For example, as the so-called sensitizer, a heat-fusible organic compound having a known melting point of 50 to 150 ° C. is generally used, and the following representative examples can be enumerated.
ｐ−ヒドロキシナフトエ酸フェニルエステル、 ｐ−ベンジルビフェニル、 ベンジルナフチルエーテル、 ベンジルテレフタレート、 ｐ−ベンジルオキシ安息香酸ベンジル、 炭酸ジフェニル、 炭酸ジトリル、 又、有機又は無機の顔料としては、給油性等の制限は
なく、例えば、 炭酸カルシウム、シリカ、酸化亜鉛、酸化チタン、水
酸化アルミニウム、水酸化亜鉛、硫酸バリウム、クレ
ー、タルク、表面処理された炭酸カルシウムやシリカ等
の無機系微粉末の他、尿素−ホルマリン樹脂、スチレン
／メタクリル酸共重合体、ポリスチレン樹脂等の有機系
の微粉末などを必要に応じて用い得る。p-Hydroxynaphthoic acid phenyl ester, p-benzyl biphenyl, benzyl naphthyl ether, benzyl terephthalate, benzyl p-benzyloxybenzoate, diphenyl carbonate, ditolyl carbonate, and as organic or inorganic pigments, there are no restrictions such as oiling properties. In addition, for example, calcium carbonate, silica, zinc oxide, titanium oxide, aluminum hydroxide, zinc hydroxide, barium sulfate, clay, talc, inorganic fine powders such as surface-treated calcium carbonate and silica, and urea-formalin. Resins, styrene / methacrylic acid copolymers, organic fine powders such as polystyrene resins, and the like can be used as necessary.
この外種々のワックス類を必要に応じて含有すること
ができる。パラフィン、アミド系ワックス、ビスイミド
系ワックス、高級脂肪酸の金属塩など公知のものでよ
い。In addition to this, various waxes may be contained as required. Known materials such as paraffin, amide wax, bisimide wax, and metal salt of higher fatty acid may be used.
又、接着剤としては、種々の分子量のポリビニルアル
コール、デンプン及びその誘導体、メトキシセルロー
ス、カルボキシメチルセルロース、メチルセルロース、
エチルセルロース等のセルロース誘導体、ポリアクリル
酸ソーダ、ポリビニルピロリドン、アクリル酸アミド／
アクリル酸エステル共重合体、アクリル酸アミド／アク
リル酸エステル／メタクリル酸３元共重合体、スチレン
／無水マレイン酸共重合体アルカリ塩、ポリアクリルア
ミド、アルギン酸ソーダ、ゼラチン、カゼイン等の水溶
性高分子の他、ポリ酢酸ビニル、ポリウレタン、スチレ
ン／ブタジエン共重合体、ポリアクリル酸、ポリアクリ
ル酸エステル、塩化ビニル／酢酸ビニル共重合体、ポリ
ブチルメタクリレート、エチレン／酢酸ビニル共重合
体、スチレン／ブタジエン／アクリル系共重合体等のラ
テックスを用いることができる。Further, as the adhesive, polyvinyl alcohol of various molecular weights, starch and its derivatives, methoxycellulose, carboxymethylcellulose, methylcellulose,
Cellulose derivatives such as ethyl cellulose, sodium polyacrylate, polyvinylpyrrolidone, acrylic acid amide /
Acrylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid terpolymer, styrene / maleic anhydride copolymer alkali salt, polyacrylamide, sodium alginate, gelatin, casein, etc. Others, polyvinyl acetate, polyurethane, styrene / butadiene copolymer, polyacrylic acid, polyacrylic acid ester, vinyl chloride / vinyl acetate copolymer, polybutyl methacrylate, ethylene / vinyl acetate copolymer, styrene / butadiene / acryl A latex such as a system copolymer can be used.
［実 施 例］ 次に本発明を具体的に例により説明する。又特に断わ
らない限り例中の部及び％はそれぞれ重量部及び重量％
を示す。[Examples] Next, the present invention will be specifically described by way of examples. Unless otherwise specified, parts and% in the examples are parts by weight and% by weight, respectively.
Indicates.
実施例−１ 水 100部 焼成クレー（アンシレックス、エンゲルハート社製、吸
油量80ml/100g） 20部 ポリスチレン粒子分散物（旭化成製L8801（粒径0.5μ
ｍ）固形分48％） 40部 を５分間ホモジナイザーで分散した後、10％ポリビニル
アルコール（日本合成製G17）50部と混合して下塗液と
した。この下塗り層塗装液を50g/m2の上質紙に塗布量が
7g/m2となる様に塗布乾燥した。Example-1 Water 100 parts Calcined clay (Ansilex, manufactured by Engelhart, oil absorption 80 ml / 100 g) 20 parts Polystyrene particle dispersion (L8801 manufactured by Asahi Kasei (particle size 0.5 μ
m) Solid content 48%) 40 parts were dispersed by a homogenizer for 5 minutes and then mixed with 50 parts of 10% polyvinyl alcohol (G17 manufactured by Nippon Gosei Co., Ltd.) to prepare an undercoat liquid. The coating amount of this undercoat layer coating solution on 50 g / m 2 high-quality paper
It was applied and dried so that the amount became 7 g / m 2 .
一方感熱発色層用塗液として、 分散液Ａ ３−（Ｎ−イソペンチル−Ｎ−エチルアミノ）−６−メ
チル−７−アニリノフルオラン 20部 ポリビニルアルコール10％液 10部 水 70部 この組成物をサンドグラインダーで平均粒径２μｍま
で粉砕した。On the other hand, as a coating liquid for the thermosensitive coloring layer, dispersion A 3- (N-isopentyl-N-ethylamino) -6-methyl-7-anilinofluorane 20 parts Polyvinyl alcohol 10% liquid 10 parts water 70 parts Was pulverized with a sand grinder to an average particle size of 2 μm.
分散液 ｐ−ヒドロキシ安息香酸ベンジル 20部 ポリビニルアルコール10％液 10部 水 70部 この組成物をサンドグラインダーで平均粒径２μｍま
で粉砕した。Dispersion Benzyl p-hydroxybenzoate 20 parts Polyvinyl alcohol 10% liquid 10 parts Water 70 parts This composition was ground to an average particle size of 2 μm with a sand grinder.
感熱発色層の形成 Ａ液75部、Ｂ液125部、炭酸カルシウム30部、10％ポ
リビニルアルコール水溶液200部、30％パラフィン分散
液17部、30％ステアリン酸亜鉛分散液17部を混合撹拌し
塗液とした。得られた塗液を、前記により形成した下塗
り層上に、乾燥後の塗工量が4.5g/m2となるように塗布
乾燥し、感熱記録紙を得た。Formation of thermosensitive coloring layer 75 parts of solution A, 125 parts of solution B, 30 parts of calcium carbonate, 200 parts of 10% polyvinyl alcohol aqueous solution, 17 parts of 30% paraffin dispersion liquid, 17 parts of 30% zinc stearate dispersion liquid are mixed and stirred to apply. It was a liquid. The resulting coating liquid was applied and dried on the undercoat layer formed as described above so that the coating amount after drying was 4.5 g / m 2 to obtain a thermosensitive recording paper.
実施例−２ 水 100部 軽質炭酸カルシウム（白石中研製カルライトSA吸油量60
ml/100g） 20部 ポリスチレン粒子分散物（旭化成製L8801、固形分48
％） 40部 を５分間ホモジナイザーで分散した後、10％ポリビニル
アルコール（日本合成製G17）50部と混合して、下塗り
層塗液とした。この下塗り層塗液を50g/m2の上質紙に塗
布量が7g/m2となるように塗布乾燥した。Example-2 Water 100 parts Light calcium carbonate (Callite SA oil absorption of Shiraishi Chuken 60
ml / 100g) 20 parts Polystyrene particle dispersion (L8801, Asahi Kasei, solid content 48)
%) 40 parts was dispersed with a homogenizer for 5 minutes, and then mixed with 50 parts of 10% polyvinyl alcohol (G17 manufactured by Nippon Gosei Co., Ltd.) to prepare an undercoat layer coating solution. This undercoat layer coating solution was applied and dried on a high-quality paper of 50 g / m 2 so that the coating amount was 7 g / m 2 .
この下塗り層上に実施例−１と同様にして感熱発色層
を設けて感熱記録紙を製造した。A thermosensitive coloring layer was provided on the undercoat layer in the same manner as in Example 1 to produce a thermosensitive recording paper.
比較例−１ 水 100部 合成シリカ（徳山曹達製ソーレックスCM吸油量150ml/10
0g） 20部 ポリスチレン粒子分散物（旭化成製L8801、固形分48
％） 40部 を５分間ホモジナイザーで分散後、実施例−１と同様に
下塗り塗液を調製し、同じ支持体上に同様に塗布して下
塗り層を設けた。この下塗り層上に実施例１と同様の感
熱発色層を設けた。Comparative Example-1 100 parts water Synthetic silica (Solex CM oil absorption 150 ml / 10 manufactured by Tokuyama Soda)
0g) 20 parts Polystyrene particle dispersion (L8801, Asahi Kasei, solid content 48)
%) 40 parts was dispersed with a homogenizer for 5 minutes, and then an undercoat coating liquid was prepared in the same manner as in Example-1 and similarly coated on the same support to form an undercoat layer. A thermosensitive coloring layer similar to that in Example 1 was provided on this undercoat layer.
比較例−２ 水 100部 アンシレックス 40部 を５分間ホモジナイザーで分散後、実施例−１と同様に
下塗り塗液を調製し、同じ支持体上に同様に塗布して下
塗り層を設けた。この下塗り層上に実施例１と同様の感
熱発色層を設け感熱記録紙を得た。Comparative Example-2 100 parts of water Ansilex 40 parts was dispersed with a homogenizer for 5 minutes, an undercoat coating solution was prepared in the same manner as in Example-1, and the same support was similarly coated to form an undercoat layer. A thermosensitive coloring layer similar to that in Example 1 was provided on the undercoat layer to obtain a thermosensitive recording paper.
比較例−３ 水 100部 ポリスチレン粒子分散物（旭化成製L8801、固形分48
％） 82部 を５分間ホモジナイザーで分散した後、実施例−１と同
様に下塗り塗液を調製し、同じ支持体上に同様に塗布し
て下塗り層を設けた。この下塗り層上に実施例１と同様
の感熱発色層を設けた。Comparative Example-3 Water 100 parts Polystyrene particle dispersion (L8801 manufactured by Asahi Kasei, solid content 48
%) 82 parts was dispersed with a homogenizer for 5 minutes, and then an undercoat coating liquid was prepared in the same manner as in Example-1 and similarly coated on the same support to form an undercoat layer. A thermosensitive coloring layer similar to that in Example 1 was provided on this undercoat layer.
実施例−１〜２、比較例−１〜３で得られた感熱記録
紙について、感度、粕付着度についての測定を行った結
果を表１に示す。Table 1 shows the results of measurement of the sensitivity and the degree of adhesion of lees on the thermal recording papers obtained in Examples-1 and 2 and Comparative Examples-1 to 3.
表１のデータは、本発明の感熱記録材料は0.44mJとく
に0.54mJの高い印加エネルギーの場合においても0.44mJ
の場合と同様すぐれた発色濃度を示すとともに、粕状着
度においても良好な結果を与えることを示している。広
い印加エネルギー範囲（0.1mJ以上）で一定の発色濃度
を保つことは、プリンター等の機会設計上及び感熱記録
紙の良好な画像品質のためにはきわめて望ましい性質で
あると言える。 The data in Table 1 shows that the heat-sensitive recording material of the present invention has 0.44 mJ, especially 0.44 mJ even at high applied energy of 0.54 mJ.
It shows that the color density is excellent as in the case of No. 1 and that it also gives a good result in terms of the degree of cake-like adhesion. It can be said that maintaining a constant color density in a wide applied energy range (0.1 mJ or more) is an extremely desirable property for the opportunity design of printers and the like and for good image quality of thermal recording paper.
一方、比較例−１は、高吸油性顔料を使用した例であ
るが0.54mJの高印加エネルギーの場合の画像濃度が低下
することを示している。比較例−２はポリスチレンを使
用しない場合であり、発色濃度が低い。比較例−３はポ
リスチレンのみを使用した例である。広い印加エネルギ
ー範囲で好ましい発色濃度を示したが、粕付着度の実用
できなかった。On the other hand, Comparative Example-1 is an example using a highly oil-absorptive pigment, but shows that the image density is lowered when a high applied energy of 0.54 mJ. Comparative example-2 is a case where polystyrene is not used and the color density is low. Comparative Example-3 is an example using only polystyrene. Although a favorable color density was shown in a wide applied energy range, the degree of adhesion of lees could not be practically used.
これらの測定は次のようにして行った。 These measurements were performed as follows.
（１） 感度 実機感熱ファクシミリを試験用に改造したものを用い
て測定した。１ライン記録時間10msec/ライン、走査線
密度８×８ドット/mmの条件でパルス幅を変調し、ドッ
トあたりの印加エネルギーを0.44mJと0.54mJに調製し、
64ラインの印字を行った。(1) Sensitivity It was measured using an actual machine thermal facsimile modified for testing. The pulse width is modulated under the conditions of 1 line recording time 10 msec / line and scanning line density 8 × 8 dots / mm, and the applied energy per dot is adjusted to 0.44 mJ and 0.54 mJ,
64 lines were printed.
その際の発色濃度をマスベス濃度計RD−514で測定
し、記録感度を代表する値とした。The color density at that time was measured with a Masbeth densitometer RD-514, and the value representative of the recording sensitivity was used.
（２） 粕付着度 サーマルヘッド上の粕付着状態を目視で検査した。○
は粕付着がほとんどなく実用上良好、△は粕付着がある
が、実用上はほとんど問題ない状態、×は粕付着が多く
実用上不可であることを示す。(2) Deposition degree of lees The state of lees deposition on the thermal head was visually inspected. ○
Indicates that there is almost no adhesion of lees and is practically good, Δ indicates that there is adhesion of lees, but there is almost no problem in practice, and x indicates that there is a large amount of lees adhesion and it is impractical.
［発明の効果］ 本発明により、熱応答性の良い高感度の、しかも高エ
ネルギーで発色させた時の画像のしずみもなくかつ感熱
ヘッドへの粕付着量のほとんどない感熱記録紙の提供が
可能となった。[Advantages of the Invention] According to the present invention, it is possible to provide a high-sensitivity heat-sensitive recording paper which has high thermal sensitivity, has no image blemishes when colored with high energy, and has almost no amount of residue adhered to the heat-sensitive head. Became.
Claims (1)
と電子受容性化合物とを含む感熱発色層を設けた感熱記
録紙において、平均粒子径５μｍ以下のポリスチレンと
吸油量が50ml/100g以上100ml/100g未満の顔料とを重量
で1/4〜4/1の割合で含ませた下塗り層を支持体と感熱発
色層との間に設けたことを特徴とする感熱記録材料。1. A thermosensitive recording paper comprising a support and a thermosensitive coloring layer containing a colorless or light-colored electron-donating dye and an electron-accepting compound, wherein polystyrene having an average particle diameter of 5 μm or less and oil absorption of 50 ml / 100 g or more. A heat-sensitive recording material comprising an undercoat layer containing a pigment of less than 100 ml / 100 g in a weight ratio of 1/4 to 4/1 and provided between the support and the heat-sensitive color forming layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1129772A JPH089269B2 (en) | 1989-05-23 | 1989-05-23 | Thermal recording material |
| EP90305548A EP0399785A1 (en) | 1989-05-23 | 1990-05-22 | Heat-sensitive recording material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1129772A JPH089269B2 (en) | 1989-05-23 | 1989-05-23 | Thermal recording material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02307784A JPH02307784A (en) | 1990-12-20 |
| JPH089269B2 true JPH089269B2 (en) | 1996-01-31 |
Family
ID=15017832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1129772A Expired - Fee Related JPH089269B2 (en) | 1989-05-23 | 1989-05-23 | Thermal recording material |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0399785A1 (en) |
| JP (1) | JPH089269B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5260252A (en) * | 1990-07-24 | 1993-11-09 | Nashua Corporation | Thermal latent image material and method of producing and developing the same |
| BR9107019A (en) * | 1990-11-01 | 1993-08-17 | Leer Metallized Prod Usa | COATED SHEET FOR DECORATIVE OR INFORMATIONAL APPLICATIONS AND PROCESS FOR FORMING THE SAME |
| US5182157A (en) * | 1990-11-01 | 1993-01-26 | Van Leer Metallized Products (U.S.A.) Limited | Method of forming a coated sheet which wicks away oil and product thereof |
| JPH05318927A (en) * | 1992-05-15 | 1993-12-03 | Nippon Paper Ind Co Ltd | Thermal recording sheet |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5423545A (en) * | 1977-07-22 | 1979-02-22 | Mitsubishi Paper Mills Ltd | Heat sensitive paper with reduced adherability of dregs to thermal head |
| JPS5586789A (en) * | 1978-12-22 | 1980-06-30 | Ricoh Co Ltd | Heat-sensitive recording material |
| JPS5627394A (en) * | 1979-08-13 | 1981-03-17 | Ricoh Co Ltd | Thermorecording material |
| JPS61139485A (en) * | 1984-12-11 | 1986-06-26 | Fuji Photo Film Co Ltd | Thermal recording paper |
| US4686546A (en) * | 1984-12-11 | 1987-08-11 | Fuji Photo Film Co., Ltd. | Heat-sensitive recording paper |
| JPS6242878A (en) * | 1985-08-10 | 1987-02-24 | Ricoh Co Ltd | Thermal recording material |
| JPH0655545B2 (en) * | 1985-10-15 | 1994-07-27 | 富士写真フイルム株式会社 | Thermal recording paper |
-
1989
- 1989-05-23 JP JP1129772A patent/JPH089269B2/en not_active Expired - Fee Related
-
1990
- 1990-05-22 EP EP90305548A patent/EP0399785A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02307784A (en) | 1990-12-20 |
| EP0399785A1 (en) | 1990-11-28 |
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