JP3019728B2 - Pressure-sensitive recording material - Google Patents

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 which is excellent in color tone, light fastness and NOx fastness of a recorded image.

[0002]

2. Description of the Related Art Pressure-sensitive recording materials utilizing a color development reaction between an electron-donating leuco dye (hereinafter referred to as "leuco dye") and an electron-accepting developer (hereinafter referred to as "developer") are widely used.

At present, a pressure-sensitive recording material having a black recorded image has a general formula (I) as a leuco dye.

Embedded image (In the formula, X represents a substituted amino group.) A fluoran compound represented by the following formula is mainly used.

A pressure-sensitive recording material using a fluoran compound represented by the general formula (I) generally has a disadvantage that the recorded image turns red by light.

JP-A-63-192777 discloses a compound of the general formula (II)

Embedded image (Wherein, Y represents a substituted amino group, and R ₁ and R _{2 each} independently represent a lower alkyl group.) A fluoran compound represented by the formula: Is described.

JP-A-1-150574 discloses a compound represented by the general formula (III):

Embedded image (In the formula, Z represents a substituted amino group.) It is disclosed that a black recorded image using a fluoran compound represented by the formula (1) has a small red change.

A black recorded image using the fluoran compound represented by the general formula (II) or (III) has a small degree of red change, but its original color tone is represented by the general formula (I ) Has a disadvantage that the color tone of the black recorded image using the fluoran compound is reddish and the image density is not sufficient.

Accordingly, the initial color tone is pure black,
There is great expectation for pressure-sensitive recording materials whose density is high and whose color tone does not change with light.

Recently, a phenomenon that a recorded image turns red due to NOx (nitrogen oxide) has also become a problem.
There is a need for a pressure-sensitive recording material having high x-fastness.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure-sensitive recording material in which the color tone of a recorded image is pure black, the density of the recorded image is high, and the red color change due to image light or NOx is small. It is in.

[0011]

The object of the present invention has been attained by using two specific leuco dyes in combination.

That is, the present invention relates to an electron-donating leuco dye
Pressure-sensitive recording material utilizing color development reaction with an acceptor color developer
98-80% by weight of the total electron donating leuco dye
% Is 2- (2,6-dimethylanilino) -3-methyl-
6-diethylaminofluoran, 2 to 10% by weight
Is 3,3-bis (4-dimethylaminophenyl) -6
It is intended to provide a pressure-sensitive recording material which is dimethylaminophthalide .

The amount of the two electron-donating leuco dyes used is preferably 2- (2,2,
6-dimethylanilino) -3-methyl-6-diethylaminofluoran is 97 to 85% by weight, and 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide is 3 to 8% by weight. It is.

Among all electron donating leuco dyes, 2- (2,6
When the content of (-dimethylanilino) -3-methyl-6-diethylaminofluorane is less than 80% by weight, the redness of a recorded image due to light may increase.

When the amount of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide in all the electron donating leuco dyes is less than 2% by weight, a sufficient density of a recorded image cannot be obtained. In addition, a pure black color tone may not be obtained. If the content is more than 10% by weight, a pure black recorded image may not be obtained.

Also, 2- (2,6-dimethylanilino)
-3-methyl-6-diethylaminofluoran and 3,3
The total amount of -bis (4-dimethylaminophenyl) -6-dimethylaminophthalide is 8% of the total electron donating leuco dye.
If the amount is less than 2%, the intended color tone and resistance to reddening of the recorded image may not be achieved at the same time.

In the pressure-sensitive recording material of the present invention, if necessary, other leuco dyes can be used in combination as long as the characteristics of the present invention are not impaired.

Examples of these fluoran compounds include 3,6-dimethoxyfluoran,
Chloro-6-cyclohexylaminofluoran, 3-chloro-6-cyclohexylaminofluoran, 2-methyl-6-cyclohexylaminofluoran, 3-methyl-6-cyclohexylaminofluoran, 1,3-dimethyl-6 Diethylaminofluoran, 2-tert-
Butyl-6-diethylaminofluoran, 2-chloro-
6-diethylaminofluoran,

2-chloro-3-methyl-6-diethylaminofluoran, 2-methyl-6- (N-ethyl-4-
Methylanilino) fluoran, 8-diethylaminobenzo [a] fluoran, 2-dibenzylamino-6-diethylaminofluoran, 2-dibenzylamino-4-methyl-6-diethylaminofluoran, 2-n-octylamino-6 Diethylaminofluoran, 2-anilino-6- (N-ethyl-Nn-hexylamino) fluoran,

2- (N-methylanilino) -6- (N-
Ethyl-4-methylanilino) fluoran, 2-chloro-3-methyl-6- [4- (4-anilinoanilino) anilino] fluoran, 2-anilino-3-methyl-6
Dimethylaminofluoran, 2-anilino-3-methyl-6-diethylaminofluoran, 2-anilino-3-
Methyl-6-di-n-propylaminofluoran, 2-
Anilino-3-methyl-6-di-n-butylaminofluoran, 2-anilino-3-methyl-6-di-n-pentylaminofluoran, 2-anilino-3-methyl-6
-(N-methyl-N-ethylamino) fluoran,

2-anilino-3-methyl-6- (N-methyl-NN-propylamino) fluoran, 2-anilino-3-methyl-6- (N-methyl-NN-butylamino) fluoran , 2-anilino-3-methyl-6
(N-methyl-N-isobutylamino) fluoran, 2
-Anilino-3-methyl-6- (N-methyl-Nn-
(Pentylamino) fluoran, 2-anilino-3-methyl-6- (N-methyl-N-cyclohexylamino) fluoran, 2-anilino-3-methyl-6- (N-ethyl-N-n-propylamino) fluoran 2-anilino-3-methyl-6- (N-ethyl-Nn-butylamino) fluoran,

2-anilino-3-methyl-6- (N-ethyl-N-isobutylamino) fluoran, 2-anilino-3-methyl-6- (N-ethyl-Nn-pentylamino) fluoran, 2 -Anilino-3-methyl-6-
(N-ethyl-N-isopentylamino) fluoran,
2-anilino-3-methyl-6- (N-ethyl-Nn
-Octylamino) fluoran, 2-anilino-3-methyl-6- [N-ethyl-N- (3-ethoxypropyl) amino] fluoran, 2-anilino-3-methyl-
6- (N-ethyl-Np-tolylamino) fluoran, 2-anilino-3-chloro-6-diethylaminofluoran,

2-anilino-3-chloro-6-di-n-
Butylaminofluoran, 2- (2-chloroanilino)
-6-diethylaminofluoran, 2- (2-chloroanilino) -6-di-n-butylaminofluoran, 2-
(2-fluoroanilino) -6-diethylaminofluoran, 2- (2-fluoroanilino) -6-di-n-butylaminofluoran, 2- (3-trifluoromethylanilino) -6-dimethyl Aminofluoran, 2- (3
-Trifluoromethylanilino) -6-diethylaminofluoran,

2- (3-trifluoromethylanilino)
-6-di-n-butylaminofluoran, 2- (3-methylanilino) -3-methyl-6-diethylaminofluoran, 2- (3-methylanilino) -3-methyl-6
-Di-n-butylaminofluoran, 2- (4-methylanilino) -3-methyl-6-diethylaminofluoran, 2- (4-t-amylanilino) -3-methyl-6
-Diethylaminofluoran, 2- (3-chloro-4-
Methylanilino) -3-methyl-6-diethylaminofluoran, 2- (2,4-dimethylanilino) -3-methyl-6-diethylaminofluoran,

2- (2,4-dimethylanilino) -3-
Methyl-6-di-n-butylaminofluoran, 2-
(2,6-dimethylanilino) -3-methyl-6-di-
n-butylaminofluoran, 2- (2,6-diethylanilino) -3-methyl-6-diethylaminofluoran, 2- (2,6-diethylanilino) -3-methyl-
6-di-n-butylaminofluoran, 2-anilino-
3-methoxy-6-diethylaminofluoran, 2,2
-Bis {4- [6 '-(N-cyclohexyl-N-methylamino) -3'-methylspiro (phthalide-3,9'
-Xanthen) -2'-ylamino] phenyl} propane and the like;

As the diarylphthalide compound,
3,3-bis (4-dimethylaminophenyl) phthalide, 3- (4-dimethylaminophenyl) -3- (4-
Diethylamino-2-methylphenyl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide, 3-
(4-dimethylaminophenyl) -3- (1-methylpyrrol-3-yl) -6-dimethylaminophthalide and the like,

As the indolylphthalide compound, 3
-(4-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (1-ethyl-2-
Methylindol-3-yl) phthalide, 3,3-bis (1-n-butyl-2-methylindol-3-yl)
Phthalide, 3,3-bis (1-n-octyl-2-methylindol-3-yl) phthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-ethyl-2-methylindole- 3-yl) phthalide, 3-
(2-ethoxy-4-dibutylaminophenyl) -3-
(1-ethyl-2-methylindole-3-yl) phthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-octyl-2-methylindole-3
-Yl) phthalide, etc.

As vinylogous phthalide compounds, 3
-(4-Diethylaminophenyl) -3- [2,2-bis (1-ethyl-2-methylindol-3-yl) ethenyl] phthalide, 3,3-bis [2- (4-dimethylaminophenyl)- 2- (4-methoxyphenyl) ethenyl] -4,5,6,7-tetrachlorophthalide, 3,
3-bis [2- (4-pyrrolidinophenyl) -2- (4
-Methoxyphenyl) ethenyl] -4,5,6,7-tetrachlorophthalide, 3,3-bis [2,2-bis (4
-Dimethylaminophenyl) ethenyl] -4,5,6
7-tetrachlorophthalide, 3,3-bis [2,2-bis (4-pyrrolidinophenyl) ethenyl] -4,5
6,7-tetrabromophthalide and the like,

The azaphthalide compounds include 3,3-
Bis (4-diethylamino-2-ethoxyphenyl)-
4-azaphthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- [4- (N-ethyl-N-phenylamino) -2-ethoxyphenyl] -4-azaphthalide, 3- (4-diethylamino- 2-ethoxyphenyl) -3- (1-ethyl-2-methylindole-3-
Yl) -4-azaphthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-n-octyl-
2-methylindol-3-yl) -4-azaphthalide and the like,

As the diarylmethane compound, 4,
4′-bis (dimethylamino) benzhydryl benzyl ether, N-halophenylleuco auramine, etc.
Rhodamine lactam compounds include rhodamine B anilino lactam and rhodamine B (4-nitroanilino)
Lactam, rhodamine B (4-chloroanilino) lactam and the like,

Examples of the thiazine compound include benzoyl leucomethylene blue and p-nitrobenzoyl leucomethylene blue, and examples of the spiropyran compound include 3-
Methylspirodinaphthopyran, 3-ethylspirodinaphthopyran, 3-phenylspirodinaphthopyran, 3-benzylspirodinaphthopyran, 3-propylspirodinaphthopyran and the like,

Examples of the fluorene compound include 3,6-bis (dimethylamino) fluorenespiro [9,3 ']-
6'-dimethylaminophthalide, 3-diethylamino-
6- (N-allyl-N-methylamino) fluorenespiro [9,3 ′]-6′-dimethylaminophthalide, 3,
6-bis (dimethylamino) -spiro [fluorene-
9,6′-6′H-chromeno (4,3-b) indole], 3,6-bis (dimethylamino) -3′-methyl-spiro [fluorene-9,6′-6′H-chromeno ( 4,3-b) indole], 3,6-bis (diethylamino) -3′-methyl-spiro [fluorene-9,
6'-6'H-chromeno (4,3-b) indole] and the like.

These can be used alone or in combination of two or more.

The pressure-sensitive recording material of the present invention can be produced by various known methods disclosed in, for example, JP-B-42-20144. Generally, a leuco dye solution in which a leuco dye is dissolved in an encapsulating solvent is encapsulated as a polymer compound as a film agent by a known encapsulation method such as a coacervation method, an interfacial polymerization method, or an insitu polymerization method. After that, it is applied to the back surface of a support such as high-quality paper, synthetic paper, plastic film, etc. to form an upper paper. on the other hand,
A developer is applied to the surface of another support to form a lower sheet. When the upper paper and the lower paper are overlapped so that the coated surfaces are in contact with each other and pressure is applied, the capsule in the pressurized part is destroyed and the leuco dye in the capsule reacts with the developer, A recorded image is formed. In addition, a plurality of copy records can be obtained by inserting several sheets of middle paper coated with a developer on the front surface and a capsule on the back surface between the upper paper and the lower paper. Also, a so-called self-contained paper type containing a developer and a capsule on the same surface of the support, or a form in which one of the developer and the capsule is contained in the support and the other is coated It can be applied to things.

As the developer used in the pressure-sensitive recording material,
Acid clay, activated clay, attapulgite, zeolite,
Inorganic developers such as bentonite and kaolin, phenolic compounds, novolak-type phenolic resins or polyvalent metal salts thereof, aromatic carboxylic acid derivatives or polyvalent metal salts thereof, salicylic acid derivatives or polyvalent metal salts thereof, salicylic acid resins Alternatively, an organic developer such as a polyvalent metal salt thereof, a terpene phenol resin or a polyvalent metal salt thereof may be used.

The pressure-sensitive recording material of the present invention may contain known additives such as an ultraviolet absorber and an antioxidant.

Examples of these additives include salicylic acid type ultraviolet absorbers such as phenyl salicylate, p-tert-butylphenyl salicylate and p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy Benzophenone, 2
-Hydroxy-4-benzyloxybenzophenone, 2
-Hydroxy-4-octyloxybenzophenone, 2
Benzophenone-based ultraviolet absorbers such as -hydroxy-4-methoxy-5-sulfobenzophenone, 2- (2-hydroxy-5-methylphenyl) benzotriazole,
-(2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2-
(2-hydroxy-3-dodecyl-5-methylphenyl) benzotriazole, 2- [2-hydroxy-4-
(2-ethylhexyl) oxyphenyl] benzotriazole, methyl-3- [3-tert-butyl-5-
(2H-benzotriazol-2-yl) -4-hydroxyphenyl] benzotriazole-based ultraviolet absorber such as a condensate of propionate and polyethylene glycol,

2'-ethylhexyl-2-cyano-3,
3-diphenyl acrylate, ethyl-2-cyano-
Cyanoacrylate-based ultraviolet absorbers such as 3,3-diphenylacrylate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis-succinate-bis (2,2,6,6-tetra) Methyl-4-piperidyl)
Ester, 2- (3,5-di-tert-butyl) malonic acid-bis (1,2,2,6,6-pentamethyl-4
Hindered amine antioxidants such as -piperidyl) ester, 2,2'-methylenebis (4-methyl-6-te
rt-butylphenol), 2,2′-ethylenebis (4-methyl-6-tert-butylphenol),
2,2′-methylenebis (4,6-di-tert-butylphenol), 4,4′-thiobis (3-methyl-6
-Tert-butylphenol), hindered phenolic antioxidants such as 4,4′-thiobis (2-chloro-6-tert-butylphenol),

Other N-methyl-N-phenyl-N'-
Methyl-N'-isopropyl-p-phenylenediamine, N-methyl-N-phenyl-N'-methyl-N'-
P-phenylenediamines such as (1-methylheptyl) -p-phenylenediamine, 6-ethoxy-1-phenyl-2,2,4-trimethyl-1,2-dihydroquinoline, 6-ethoxy-1-ethyl- Quinolines such as 2,2,4-trimethyl-1,2-dihydroquinoline and 6-ethoxy-1-octyl-2,2,4-trimethyl-1,2-dihydroquinoline; 6-ethoxy-1-phenyl-
2,2,4-trimethyl-1,2,3,4-tetrahydroquinoline, 6-ethoxy-1-octyl-2,2,4
-Tetrahydroquinolines such as trimethyl-1,2,3,4-tetrahydroquinoline, 4-methoxy-di-n-
Examples include anilines such as butylaniline.

It has been known that 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide has low light fastness of a recorded image, but unexpectedly,
It has been found by the present inventors that a sufficient light fastness is exhibited by using-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran in combination within a certain amount.

Incidentally, JP-A-1-150574 mentioned above discloses 3,3 as an example of a known leuco dye which can be used in combination with the fluoran compound represented by the general formula (III).
Derivatives of compounds having a basic skeleton such as -bis (4-aminophenyl) -6-aminophthalide.
Specific description and implementation of the combined use of-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide There is no example and no description of specific effects.

[0042]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to the examples.

Example 1 1.9 g of 2- (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 3,3-bis (4-dimethylaminophenyl) -6-dimethylamino 0.1 g of phthalide to SAS-
This was dissolved in 47 g of 296 (solvent manufactured by Nippon Petrochemical) under heating. 5 g of a system modifier was added to 100 g of water, and the pH was adjusted to 4 with an aqueous sodium hydroxide solution. The above solution and 10 g of melamine formaldehyde prepolymer were added thereto, and the mixture was emulsified with a homomixer until oil droplets became 4 μm. Then, the mixture was heated to 50 ° C. with stirring and stirred for 1 hour. After cooling to room temperature, the pH was adjusted to 7.5 with 25% aqueous ammonia to prepare a capsule dispersion of the leuco dye.

The capsule dispersion liquid 1 thus prepared
0 g, 2 g of wheat starch and 1 g of latex were mixed well, and the amount of solids applied to fine paper of 50 g / m ² was 5 g / m ^2.
g / m ² to produce white upper paper.

[Example 2] In Example 1, 2-
Instead of 1.9 g of (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2 g 1.86 g of-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.14 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide were used. Except for the above, the same operation as in Example 1 was performed to produce a white upper sheet.

[Embodiment 3] In Embodiment 1, 2-
Instead of 1.9 g of (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2 g 1.78 g of-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran, 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, −
The same operation as in Example 1 was carried out except that 0.12 g of (2,4-dimethylanilino) -3-methyl-6-diethylaminofluoran was used, to produce a white upper paper.

[Embodiment 4]
Instead of 1.9 g of (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2 g 1.8 g of-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.2 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide were used. Except for the above, the same operation as in Example 1 was performed to produce a white upper sheet.

[Comparative Example 1]
Instead of 1.9 g of (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2 g The same operation as in Example 1 was carried out, except that only 2.0 g of-(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran was used, to produce a white upper paper.

[Comparative Example 2]
Instead of 1.9 g of (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 0.1 g of 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2 g The same operation as in Example 1 was performed, except that 2.0 g of-(2,4-dimethylanilino) -3-methyl-6-diethylaminofluoran was used,
White paper was created.

(Evaluation method: Color image density measurement, light storage stability test and NOx resistance test) Measurement of Colored Image Density The upper papers prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were overlapped so that the lower paper coated with clay was in contact with the coated surface, and color was formed by pressing with a roller. The density of the color image was measured using a Macbeth densitometer RD-914, and the hue was measured using a color difference meter TC-PIII of Tokyo Denshoku Co., Ltd.

Table 1 shows the results.

[Table 1] {Macbeth density (OD value) Hue (a value)} {B / WC} Example 1 0.85 0.62 8.96 Example 20 .85 0.64 8.56 Example 3 0.85 0.63 8.70 比較 Comparative Example 10 .84 0.57 9.74 Comparative Example 2 0.85 0.64 7.01 に お い て In Table 1, In the Macbeth density term, B / W indicates a measured value using a visual filter, and C indicates a measured value using an SPI red filter.

The higher the Macbeth density, the higher the color density. Also, the higher the a value of the hue, the redr the color tone.

In the Macbeth density, if the measured value of C is high even if there is no difference between the measured values of B / W, the visual density looks high.

2. Light resistance preservation test A color storage image obtained by the above operation was subjected to a light preservation test (irradiation with a fluorescent lamp of 20,000 Lux for 24 hours), and the image density and hue after the test were measured in the same manner. Was determined.

Table 2 shows the results.

[Table 2] Image fastness (%) Redness (Δa) {B / WC} Example 1 80 77 0.60 Example 2 80 78 0.59 Example 3 79 77 0.98 Comparative Example 1 77 77 0.59 Comparative Example 2 76 68 8.02 Image fastness (%) = [(image density after test) / (image density before test)] × 100 Redness (Δa) = (a value after test) − (a before test)
Value) In Table 2, the higher the value of the image fastness, the higher the storability of the color image. The higher the numerical value of the redness, the stronger the redness of the color image.

As shown in Tables 1 and 2, the recorded image of the pressure-sensitive recording material of the present invention has a low reddish color tone, a high color density, and a small decrease in density and redness due to light.

3. NOx Resistance Test The upper paper prepared in Example 4 and Comparative Example 1 was overlapped with the lower paper coated with the zinc salt of the salicylic acid derivative so that the coated surface was in contact with the lower paper, and was pressed by a roller to develop color. This color image test piece was subjected to a NOx resistance test as described below to determine the degree of redness of the hue.

The test piece was suspended in a closed container, 25 mL of 1% NaNO ₂ and 375 mL of water were placed in a porcelain evaporating dish, and the test piece was placed on a suspended bracket to generate NOx gas. It was left in the atmosphere for 30 minutes.

The image hue of this test piece was measured in the same manner as described above, and the red hue of the hue was determined. Table 3 shows the above results.

As shown in Table 3, the recorded image of the pressure-sensitive recording material of the present invention has little redness due to NOx.

[0063]

The pressure-sensitive recording material of the present invention has a high recorded image density, a pure black color, a small reddening due to light or NOx, and a small decrease in density.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-17698 (JP, A) JP-A-1-150574 (JP, A) JP-A-1-198385 (JP, A) Field (Int.Cl. ⁷ , DB name) B41M 5/145

Claims (3)

(57) [Claims] 1. An electron-donating leuco dye and an electron-accepting color developing agent.
In a pressure-sensitive recording material utilizing a coloring reaction with an agent, 98 to 80% by weight of all electron donating leuco dyes is 2-
(2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran, 2 to 10% by weight of 3.3
- bis (4-dimethylaminophenyl) -6-dimethylamino phthalide pressure-sensitive recording material which is de. 2. 97-8 of all electron donating leuco dyes.
5% by weight is 2- (2,6-dimethylanilino) -3-methyl-6-diethylaminofluoran and 3 to 8% by weight is 3,3-bis (4-dimethylaminophenyl)-.
2. The pressure-sensitive recording material according to claim 1, which is 6-dimethylaminophthalide. Wherein the claim 1 or an electron donating leuco dye is characterized in that it is microencapsulated
2. Pressure-sensitive recording material.