JPH0939383A - Pressure-sensitive recording body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make application to an OCR reading in a specified wave region possible by using both at least one kind of specified phthalide compd. and a zinc salt of salicyclic acid deriveties as a color developing agent. SOLUTION: An underpaper is obtd. by using a coating liq. of a color developing agent contg. zinc 3,5-di(α-methylbenzyl) salicylate. An intermediate paper is obtd. by providing a capsule layer wrapping, e.g. 3,3,-bis(4-diethylamino-2- ethoxyphenyl)-4,7-diazaphthalide among phthalide compd. of formula (wherein R-R are each a 1-6C alkyl group, and R5 and R6 are each a hydrogen atom or a 1-6C alkoxyl group but R5 and R6 are not hydrogen atoms at the same time) as a basic dye on the opposite side of the face of the underpaper which is coated with the color developing agent. The capsule-coated face of the intermediate paper and the color developing agent-coated face are made to face each other and are superposed on each other to perform dot printing. This pressure-sensitive recording body exhibits excellent printing characteristics to an OCR apparatus, e.g. with a reading wavelength of 670nm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive recording material utilizing a color reaction of a colorless or light-colored basic dye and a coloring agent, and more particularly to an optical character reader having a reading wavelength of 650 to 700 nm. The present invention relates to a pressure-sensitive recording material that exhibits excellent properties when applied.

[0002]

2. Description of the Related Art A pressure-sensitive recording medium is prepared by applying a microcapsule composition containing microcapsules containing droplets of a basic dye or the like as a main component to one side of a support and a paper or one side of the support. Is a color-developing composition containing an electron-accepting color-developing agent (hereinafter simply referred to as a color-developing agent) as a main component, which is colored when contacted with a basic dye to form a color-developing layer on the opposite surface. Includes a middle paper coated with a microcapsule composition and a lower paper coated with a colorant composition on one side of a support to form a color layer. These three types of sheets are used as upper paper and lower paper, or It is put into practical use as a copy set by combining upper paper, middle paper, and lower paper in this order. A self-coloring pressure-sensitive recording medium capable of pressure-sensitive recording with one sheet by coating a microcapsule containing a basic dye and a colorant on the same surface of the support is also a form of pressure-sensitive recording medium. Are known.

In recent years, office automation has been advanced along with the development of the information processing industry.
OCR device and OMR with reading wavelength at 700 nm
With the spread of devices, various slips such as order receiving slips, sales slips, shipping slips, purchasing slips, and input / output slips are becoming suitable slips for OCR and OMR devices.

By the way, in the case of the conventional pressure-sensitive recording material for OCR reading, although the color image has absorption at 650 to 700 nm, there is a problem in light resistance, plasticizer resistance and the like, so improvement from a practical standpoint is strongly desired. It is rare.

[0005]

DISCLOSURE OF THE INVENTION The object of the present invention is 65
A feeling that when applied to an optical character reading (OCR) device having a reading wavelength from 0 to 700 nm, it has excellent characteristics, that is, high density at the reading wavelength and excellent performance such as light resistance and plasticizer resistance. It is to provide a pressure recording body.

[0006]

The present invention provides a pressure-sensitive recording material utilizing a color-forming reaction between a colorless or light-colored basic dye and a color-developing agent, wherein the basic dye is represented by the following general formula (1).
And a zinc salt of a salicylic acid derivative as a colorant, which is a pressure-sensitive recording material.

[0007]

Embedded image

(In the formula, R _{1 to} R ₄ are each a C _{1 to} C ₆ alkyl group, and R ₅ and R ₆ are each a hydrogen atom or C
Shows an alkoxyl group of ₁ -C _6. However, R ₅ and R
₆ is not a hydrogen atom at the same time. )

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of the phthalide compound represented by the general formula (1) used in the present invention include, for example, 3,
3-bis (4-dimethylamino-2-ethoxyphenyl) -4,7-diazaphthalide, 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide, 3,3-bis (4 -Di-n-butylamino-2-ethoxyphenyl) -4,7-diazaphthalide,
3,3-bis (4-di-n-pentylamino-2-ethoxyphenyl) -4,7-diazaphthalide, 3,3-bis (4-N-methyl-Nn-propylamino-2-ethoxyphenyl) ) -4,7-Diazaphthalide, 3,3-
Bis (4-N-ethyl-N-isoamylamino-2-ethoxyphenyl) -4,7-diazaphthalide, 3,3-
Bis (4-N-ethyl-Nn-hexylamino-2-
Ethoxyphenyl) -4,7-diazaphthalide, 3,3
-Bis (4-diethylamino-2-methoxyphenyl)
-4,7-diazaphthalide, 3,3-bis (4-di-n
-Butylamino-2-methoxyphenyl) -4,7-diazaphthalide, 3,3-bis (4-diethylamino-2)
-Isopropoxyphenyl) -4,7-diazaphthalide, 3,3-bis (4-diethylamino-2-n-hexyloxyphenyl) -4,7-diazaphthalide, 3-
(4-diethylamino-2-ethoxyphenyl) -3-
(4-Dimethylaminophenyl) -4,7-diazaphthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (4-diethylaminophenyl) -4,7-
Examples include diazaphthalide. Among these compounds, 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide is particularly preferably used because it exhibits particularly excellent color developability, light resistance, plasticizer resistance and the like. . The compounds are not limited to these compounds, and any compounds included in the general formula (1) can be used, and if necessary, two or more kinds can be used in combination.

In the present invention, the basic dye used in combination with the specific diazaphthalide compound is a known basic dye within a range that does not impair the desired effects of the present invention, such as triarylmethane compounds, diarylmethane compounds and fluorane compounds. Compounds, phenothiazine compounds, phenoxazine compounds, rhodamine lactam compounds, spiropyran compounds, leuco auramine compounds and the like are used.

Among these basic dyes, by using at least one of the fluoran compounds represented by the general formula (2) in combination, a clear black color image can be obtained, and the light resistance and plasticizer resistance of the image can be obtained. It is possible to obtain a pressure-sensitive recording material having excellent storability.

[0012]

Embedded image

(Wherein R ₇ and R ₈ are C _{1 to} C, respectively)
_{6 represents} an alkyl group, an ethoxypropyl group or a p-tolyl group, R ₉ represents a hydrogen atom or a methyl group, and R ₁₀ represents a methyl group, a chlorine atom or a trifluoromethyl group. n shows the integer of 0-2. )

Specific examples of the fluorane compound represented by the general formula (2) include 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-anilinofluorane and 3-diethylamino-6. -Methyl-7-anilinofluorane, 3-di-n-butylamino-6-methyl-7
-Anilinofluorane, 3-di-n-pentylamino-
6-methyl-7-anilinofluorane, 3-diethylamino-7- (m-trifluoromethylanilino) fluorane, 3- (N-ethyl-N-isobutyl) amino-6
-Methyl-7-anilinofluorane, 3- (N-ethyl-p-toluidino) -6-methyl-7-anilinofluorane, 3- (N-ethyl-N-ethoxypropyl) amino-6-methyl -7-anilinofluorane, 3-diethylamino-6-methyl-7- (2,4-xylidino) fluorane, 3-diethylamino-6-methyl-7-
(3,5-Xylidino) fluorane, 3-diethylamino-6-methyl-7- (2,6-xylidino) fluorane, 3-di-n-butylamino-6-methyl-7-
(3,5-xylidino) fluorane, 3-di-n-butylamino-7- (o-chloroanilino) fluorane, 3
-(N-ethyl-N-isoamyl) amino-7- (o-
Examples include compounds such as chloroanilino) fluorane.
The compounds are not limited to these compounds, and any compound included in the general formula (2) can be used, and if necessary, two or more kinds can be used in combination. In the present invention, the use ratio of the phthalide compound represented by the general formula (1) and the fluoran compound represented by the general formula (2) is not particularly limited, but usually 10:90 to 50:50 by weight. Is preferably used in the ratio of.

The basic dye used in the present invention includes a benzotriazole derivative, a benzophenone derivative, and
A mixture of various known UV absorbers such as cyanoacrylate derivatives, salicylic acid derivatives, cinnamic acid derivatives, cottonseed oil,
Dissolved in natural or synthetic hydrophobic media such as hydrogenated terphenyls, hydrogenated terphenyl derivatives, alkylbiphenyls, alkylnaphthalenes, diarylalkanes, paraffins, naphthenic oils, dibasic acid esters such as phthalates, and coacervation Method, interfacial polymerization method, in-si
It is encapsulated in microcapsules by a capsule manufacturing method such as tu polymerization method. The film material for the microcapsules is not particularly limited, but a synthetic polymer film material such as an aminoaldehyde resin, a polyurea resin, a polyamide resin or the like is preferable so that color stains do not occur due to unintentional pressure or rubbing. Used.

Aminoaldehyde resin wall membrane capsules include at least one amine such as urea, thiourea, alkylurea, ethyleneurea, acetoguanamine, benzoguanamine, melamine, guanidine, piuret, and cyanamide, and formaldehyde, acetaldehyde, para. It is produced by an in-situ polymerization method using at least one aldehyde such as formaldehyde, hexamethylenetetramine, glutaraldehyde, glyoxal, and furfural, or an initial condensate obtained by condensing them.

Polyurethane resin and polyurea resin wall membrane capsules are produced by an interfacial polymerization method using, for example, polyvalent isocyanate and water, polyvalent isocyanate and polyol, isothiocyanate and polyol, polyvalent isocyanate and polyamine, and isothiocyanate and polyamine. To be done. The polyamide resin film capsule is manufactured by, for example, an interfacial polymerization method using acid chloride and amine.

The microcapsules containing the thus-prepared specific basic dyes include polyvinyl alcohols, starches, carboxymethyl cellulose, latexes and the like by a conventional method, as well as various tilting agents such as pulp powder and raw starch powder. As a capsule coating liquid, the auxiliaries of
Used for manufacturing top and middle paper, self-coloring type pressure sensitive recording paper, etc.

In the present invention, a zinc salt of a salicylic acid derivative is selectively used as a color developing agent. By the way, when an inorganic compound such as activated clay or an acidic organic polymer such as p-phenylphenol novolac resin is used as a colorant, the color development is low, and the image storability, especially light resistance and plastic resistance is low. There are problems that the formulation is inferior and the obtained pressure-sensitive recording material itself tends to yellow with time.

Specific examples of such a coloring agent include, for example, 3
-Methyl-5- (α-methylbenzyl) salicylic acid, 3
-Methyl-5- (α, α-dimethylbenzyl) salicylic acid, 3,5-di-tert-butylsalicylic acid, 3,5
-Di-tert-butyl-6-methylsalicylic acid, 3,
5-di-tert-butyl-5-phenylsalicylic acid,
3,5-di-tert-amylsalicylic acid, 3,5-di-cyclohexylsalicylic acid, 3-cyclohexyl-5
-(Α-methylbenzyl) salicylic acid, 3-dodecylsalicylic acid, 3-methyl-5-dodecylsalicylic acid, 3-
Dodecyl-6-methylsalicylic acid, 3-phenyl-5-
(Α-Methylbenzyl) salicylic acid, 3-phenyl-5
-(Α, α-dimethylbenzyl) salicylic acid, 3- (α
-Methylbenzyl) salicylic acid, 3- (α-methylbenzyl) -5-methylsalicylic acid, 3- (α-methylbenzyl) -5-phenylsalicylic acid, 3- (α, 4-dimethylbenzyl) -5-methylsalicylic acid, 3- (α, α
-Dimethylbenzyl) -5-methylsalicylic acid, 3-
(Α, α-Dimethylbenzyl) -6-methylsalicylic acid, 3,5-di (α, α-dimethylbenzyl) salicylic acid, 3,5-di (α-methylbenzyl) salicylic acid, 3
-(Α-Methylbenzyl) -5- (α, α-dimethylbenzyl) salicylic acid, 3- (α-methylbenzyl) -5
-Bromo salicylic acid, 3- (α-methylbenzyl) -4
-Methylsalicylic acid, 3- (α-methylbenzyl) -6
-Methylsalicylic acid, 3-nonylsalicylic acid, 3,5-
Dinonylsalicylic acid, 3-nonyl-5-methylsalicylic acid, 3-nonyl-6-methylsalicylic acid, 3-nonyl-
Examples thereof include 5-phenylsalicylic acid, 3-methyl-5-nonylsalicylic acid, 5- (4-mesitylmethylbenzyl) salicylic acid, carboxylated terpene phenol resin, and benzylated styrenated salicylic acid. If necessary, two or more kinds may be used in combination.

Among these compounds, 3,5-di (α
-Methylbenzyl) salicylic acid zinc salt, carboxylated terpene phenolic resin zinc salt or benzylated styrenated salicylic acid zinc salt exhibits excellent performance, among which 3,5-di (α-methylbenzyl) salicylic acid zinc salt. Is particularly preferably used because it is excellent in color developability and image storability.

The coloring agent coating liquid is prepared by a method in which a zinc salt of a salicylic acid derivative is usually dispersed in water together with an adhesive. Examples of such an adhesive include starch, casein, gum arabic, carboxycellulose, polyvinyl alcohol, styrene / butadiene copolymer latex, vinyl acetate latex and the like. Further, in the coating liquid, zinc oxide, magnesium sulfate, titanium oxide, aluminum hydroxide, calcium carbonate, magnesium sulfate, if necessary,
Inorganic pigments such as calcium sulfate and various auxiliaries known in the field of pressure-sensitive copying paper production can be added appropriately.

The method of applying the coating liquid is not particularly limited, and for example, an on-machine or off-machine coater equipped with an appropriate coating device such as an air knife coater, roll coater, blade coater, rod blade coater, curtain coater, lip coater, etc. And the dry weight is 2-10
It is applied to a support such as paper, synthetic paper, film or the like so that it will be about g / m ² .

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the examples, parts and% are parts by weight and% by weight, respectively, unless otherwise specified.

Example 1 [Preparation of Coloring Agent Coating Liquid] 20 parts of zinc salt of 3,5-di (α-methylbenzyl) salicylic acid, 80 parts of kaolin, 1 part of magnesium oxide, carboxy-modified styrene-butadiene copolymer 20 parts (solid content) of latex and 1 part of sodium carboxymethyl cellulose were added to prepare a coloring agent coating liquid. [Manufacture of lower paper] The above color developing agent coating liquid is applied to a base paper of 40 g / m ^{2 by} an air knife coater so that the dry weight is 5 g / m ² , dried, and calendered to prepare a lower paper for pressure-sensitive recording. It was created.

[Preparation of Microcapsule Dispersion] In a stirring and mixing vessel equipped with a heating device, 150 parts of a 3% aqueous solution of polyvinyl alcohol (trade name: PVA-117, manufactured by Kuraray Co., Ltd.) was added to prepare an aqueous medium for capsule production. And Separately, 100 parts of an alkylnaphthalene (trade name: KMC oil, manufactured by Kureha Chemical Co., Ltd.) as a basic dye, 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,
7-diazaphthalide 10 parts, as an ultraviolet absorber 2-
2 parts of (2'-hydroxy-5'-methylphenyl) benzotriazole are dissolved, and polymethylene polyphenyl isocyanate (trade name: Millionate MR400,
The above capsules are prepared by dissolving 5 parts of a product of Nippon Polyurethane Industry Co., Ltd. and 2 parts of a hexamer diisocyanate trimer having a biuret bond (trade name: N-3200, manufactured by Sumitomo Bayer Co., Ltd.) as a capsule core substance. 1000 per minute in TK homomixer in preparative aqueous medium
The emulsion was dispersed for 1 minute at 0 rotation. 1 part of diethylenetriamine was added to this emulsified dispersion, and the mixture was stirred at room temperature for 30 minutes, then the temperature of the system was raised to 70 ° C., and the mixture was stirred for 3 minutes.
After reacting for a time, the temperature was lowered to room temperature to prepare microcapsules composed of a polyurea resin / polyurethane resin wall film having an average particle diameter of 5.6 μm.

[Preparation of Microcapsule Coating Liquid] 70 parts of wheat starch powder and 2 parts of aqueous solution of oxidized starch per 100 parts by weight (solid content) of the microcapsule dispersion thus obtained.
0 part (solid content) was added to prepare a microcapsule coating solution.

[Manufacture of Medium Paper] The microcapsule coating solution is applied to the opposite side of the lower sheet from the surface coated with the coloring agent by an air knife coater to a dry weight of 4 g / m ² and dried. A medium pressure recording paper was obtained.

Example 2 In the preparation of the microcapsule dispersion of Example 1,
3,3-bis (4-di-n-butylamino-2-ethoxyphenyl) -4,7-diazaphthalide instead of 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide A pressure-sensitive recording medium paper was obtained in the same manner as in Example 1 except that was used.

Example 3 In the preparation of the microcapsule dispersion of Example 1,
3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide instead of 10 parts 3,3
In the same manner as in Example 1 except that 3 parts of 3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide and 7 parts of 3-diethylamino-6-methyl-7-anilinofluorane were used. An intermediate paper for pressure-sensitive recording was obtained.

Examples 4 to 5 In the preparation of the microcapsule dispersion of Example 3,
Three types of pressure-sensitive recording medium paper were obtained in the same manner as in Example 3 except that the following compound was used instead of 3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide. -Example 4: 3,3-bis (4-di-n-butylamino-2-ethoxyphenyl) -4,7-diazaphthalide-Example 5: 3,3-bis (4-diethylamino-2-)
Methoxyphenyl) -4,7-diazaphthalide

Examples 6 to 7 In the preparation of the microcapsule dispersion of Example 3, 3
Two types of pressure-sensitive recording medium paper were obtained in the same manner as in Example 3 except that the following compounds were used instead of -diethylamino-6-methyl-7-anilinofluorane. -Example 6: 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-anilinofluorane-Example 7: 3-diethylamino-7- (m-trifluoromethylanilino) fluorane

Examples 8 to 9 In the preparation of the coloring agent coating liquid of Example 1, 3,5-di (α-
Two kinds of pressure-sensitive recording intermediate papers were obtained in the same manner as in Example 1 except that the following compound was used in place of the methylbenzyl) salicylic acid zinc salt. Example 8: Zinc salt of carboxylated terpene phenolic resin Example 9: Zinc salt of benzylated styrenated salicylic acid

Example 10 An intermediate paper for pressure-sensitive recording was obtained in the same manner as in Example 1 except that the microcapsule dispersion liquid was prepared as follows. [Preparation of Microcapsule Dispersion] In a stirring and mixing vessel equipped with a heating device, 200 parts of a 3% aqueous solution of an ethylene-maleic anhydride copolymer (trade name: EMA31, manufactured by Monsanto) was charged, and then 20% caustic soda was added. The aqueous solution was added dropwise to adjust the pH to 6.0 to obtain an aqueous medium for capsule production. Separately, 100 parts of alkylnaphthalene (trade name: KMC oil, manufactured by Kureha Chemical Co., Ltd.), 10 parts of 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide as a basic dye, and ultraviolet absorption 2 parts of 2- (2'-hydroxy-5'-methylphenyl) benzotriazole was dissolved as an agent to obtain an internal phase oil.
Next, this internal phase oil was charged into the above-mentioned aqueous medium for capsule production, and emulsified and dispersed at 10,000 rpm for 1 minute using a TK homomixer, and then the temperature was raised to 55 ° C. Separately, 15 parts of melamine was added to 45 parts of 37% aqueous formaldehyde solution and reacted at 60 ° C. for 15 minutes to prepare an aqueous prepolymer solution. This prepolymer aqueous solution was added dropwise to the emulsion, and the mixture was further stirred, adjusted to pH 5.3 with 0.1N-hydrochloric acid, heated to 80 ° C., and kept at that temperature for 1 hour, then 0.2N. -The pH was lowered to 3.5 with hydrochloric acid, the temperature was kept for 3 hours, and then allowed to cool to prepare microcapsules consisting of an aminoaldehyde resin film having an average particle diameter of 5.3 µm.

Comparative Examples 1 to 4 In the preparation of the microcapsule dispersion of Example 1,
Four kinds of pressure-sensitive recording intermediate papers were obtained in the same manner as in Example 1 except that the following compounds were used instead of 3,3- (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide. . Comparative Example 1: 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide Comparative Example 2: 3-diethylamino-6-methyl-7-anilinofluorane Comparative Example 3: 3 3-bis [1- (4-methoxyphenyl) -1- (4-dimethylaminophenyl) ethylene-
2-yl] -4,5,6,7-tetrachlorophthalide-Comparative Example 4: 3- [1,1-bis (p-diethylaminophenyl) ethylene-2-yl] -6-dimethylaminophthalide.

Comparative Example 5 In the preparation of the coloring agent coating liquid of Example 1, 3,5-di (α
A pressure-sensitive recording medium paper was obtained in the same manner as in Example 1 except that 100 parts of activated clay was used instead of 20 parts of the zinc salt of methylbenzyl) salicylic acid and 80 parts of kaolin.

Comparative Example 6 3,5-di (α-in the preparation of the coloring agent coating liquid of Example 1
A pressure-sensitive recording midleaf paper was obtained in the same manner as in Example 1 except that p-phenylphenol novolac resin was used in place of methylbenzyl) salicylic acid zinc salt.

Using the thus obtained 16 kinds of pressure-sensitive recording medium papers, various performance comparison tests were conducted, and the results are shown in Table 1. [PCS Value] The PCS value is an index indicating the degree of OCR readability. The PCS value represents the relative density difference between the color print and the paper and is calculated by the following equation.

PCS = (Rw-Rp) / Rw Here, Rw represents the reflectance of the blank portion and Rp represents the reflectance of the printed portion. Therefore, the higher the PCS value, the clearer the identification of characters and the higher the readability. Generally, a PCS value of 0.70 or more is required.

[Measurement of PCS value at 670 nm] The prepared pressure-sensitive recording medium papers were overlaid so that the capsule-coated surface and the coloring agent-coated surface faced each other, and printed with a dot printer. The reflectance at 670 nm was measured by a spectrophotometer (U-3300 manufactured by Hitachi), and the PCS value was calculated from the measured reflectance. [Lightfastness test] Colored surface of printing obtained above (coloring agent coated surface)
After exposed to direct sunlight for 8 hours, the PCS value was similarly calculated and shown in Table 1. [Plasticizer resistance test] A vinyl chloride film was overlaid on the print color-developing surface (coloring agent-coated surface) obtained above and left at room temperature for 24 hours, and then the PCS value was similarly calculated and shown in Table 1.

[0041]

[Table 1]

[0042]

As is apparent from the results shown in Table 1, the pressure-sensitive recording material of the present invention in which a specific phthalide compound and a specific color-developing agent are combined is an optical character reading (OCR) having a reading wavelength of 670 nm. It was a pressure-sensitive recording medium exhibiting excellent characteristics for the apparatus.

Claims (4)

[Claims] 1. A pressure-sensitive recording material utilizing a color-forming reaction between a colorless or light-colored basic dye and a color-developing agent, wherein at least one phthalide compound represented by the following general formula (1) is used as the basic dye. A pressure-sensitive recording material comprising a zinc salt of a salicylic acid derivative as a coloring agent. Embedded image (In the formula, R _{1 to} R ₄ each represent a C _{1 to} C ₆ alkyl group, R ₅ and R ₆ each represent a hydrogen atom or a C _{1 to} C ₆ alkoxyl group, provided that R ₅ and R ₆ are the same. Not a hydrogen atom.) 2. The coloring agent is at least one of zinc salt of 3,5-di (α-methylbenzyl) salicylic acid, zinc salt of carboxylated terpene phenol resin and zinc salt of benzylated styrenated salicylate. The pressure-sensitive recording material described. 3. The pressure-sensitive recording material according to claim 1, wherein at least one fluoran compound represented by the following general formula (2) is used in combination as the basic dye. Embedded image (Wherein R ₇ and R ₈ are each a C ₁ -C ₆ alkyl group, ethoxypropyl group or p-tolyl group, R ₉ is a hydrogen atom or a methyl group, and R ₁₀ is a methyl group, a chlorine atom or trifluoro group. Represents a methyl group, and n represents an integer of 0 to 2.) 4. The pressure-sensitive recording material according to claim 1, 2 or 3, wherein the phthalide compound is 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4,7-diazaphthalide.