JPS588687A - Pressure sensitive copying paper - Google Patents

Abstract

PURPOSE:To obtain paper with excellent lightfastness of printed letters even if a xanthin group compound is used as a color developing agent by making an organic solvent that contains a color developing agent in micro capsules contain an alkylphenol compound. CONSTITUTION:Phenol at least one of its 2nd and 6th positions being substituted by alkyl group or alkylene group, or its derivative (e.g. 2,6-dimethylphenol, 2,6- di-tert butyl-4-methylphenol) is added to a solvent by parts by weight of 0.2-10 to 100pts.wt. of the solvent. The solvent contains a color developing agent. Further, to this organic solvent at least one of compounds of formulaI(R1-R3 in the formula representing alkyl group of C4-20, phenol group or alkyl phenyl group) or compounds of formula II (R4, R5 in the formula representing alkylene group of C1-15, and R6, R7 representing alkyl group C8-22) is added in micro capsules, and also an adhesive, etc. are added to the solvent in suitable amount to form a color developing layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to pressure-sensitive copying paper, and in particular, to prevent the copying paper itself from becoming colored or the printed characters discolored when exposed to sunlight or fluorescent light. Not related to pressure-sensitive copying paper.

Usually, pressure-sensitive copying paper is made of microcapsules containing oil droplets in which an electron-donating organic coloring agent (hereinafter simply referred to as coloring agent) is dissolved. A coloring agent composition containing an electron-accepting coloring agent (hereinafter simply referred to as coloring agent) as a main component that changes color when it comes into contact with the coloring agent is applied to the coated upper paper and one side of the support. , an inner paper coated with a color former microcapsule composition on the opposite side, and a lower paper coated with a color former composition on one side of the support, and these 8 types of sheets were used as upper paper, lower paper, or top paper. , middle paper, and bottom paper have been put into practical use as a copy set. In addition, self-coloring pressure-sensitive copying paper is a type of pressure-sensitive copying paper in which a coloring agent and a coloring agent are coated on the same side of a support, allowing pressure-sensitive recording on a single sheet.
well known.

Various compounds such as triallylmethane compounds, diphenylmethane compounds, xanthine compounds, thiazine thread compounds, and spiropyran compounds are known as coloring agents for such pressure-sensitive copying paper. Colored images obtained by contact reaction with agents generally tend to have lower color density or change in color tone when exposed to sunlight or fluorescent light, and thus have poor so-called printing light fastness. In particular, xanthine compounds have poor light resistance, and for example, fluoran dyes such as those exemplified in U.S. Pat. It forms a black edge color image by reacting with the print, but the light resistance of the print is extremely poor and the color changes to red and is discarded. In addition, in the case of a color former layer containing a fluoran dye, the color former layer itself is colored red by irradiation with sunlight etc. (hereinafter referred to as CB surface white color), and the color former layer itself is colored red when irradiated with sunlight etc. When copying is performed using this layer (hereinafter referred to as printing after CB surface light resistance), there are defects such as only a reddish colored image is obtained.

In view of the current situation, the inventors of the present invention have found that even if the above-mentioned xanthine-based compounds are used as color formers, especially fluoran-based dyes, which have extremely poor light resistance, printing has excellent light resistance, and there is no white color on the CB surface. The present invention was completed as a result of extensive research into pressure-sensitive copying paper that does not change color after being exposed to light.

The present invention provides a pressure-sensitive copying paper using microcapsules encapsulating a non-volatile organic solvent containing a coloring agent, in which an alkylphenol compound is added in the organic solvent in an amount of 0.2 to 10 parts by weight per 100 parts by weight of the organic solvent. This is a pressure-sensitive copying paper characterized by containing:

The alkylphenol compound used in the present invention means that at least one of the 2.6 positions is an alkyl group,
Phenols and their derivatives substituted with alkylene groups or hydroxyl groups. Specifically, the following compounds are exemplified.

2,6-dimethylphenol, 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-
Methylephenol, 9. -tert methyl-4-methyl phenol, 3-methyl-6-tert butylphenol, 2,4-tert
t-butylphenol, 2-5-di-tert-butylzlz-4-methylphenol, 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, 2,4.6-)-tert-butylphenol, 2.4.6-) Sidimethylaminomethyl-phenol, butylhydroxyanisole, 216-tert butyl-4-ethylphenol, 2,4-dimethy) v-6-tert butylphenol, catechol Az, 4-tert butyl catechol/v14,6-
Di-tert-butylresorcin% 3-tert-butylhydroquinone, 3,5-di-tert-butylhydroquinone, 3゜5-di-tert-amylhydroquinone,
2.2'-methylenebis(4-methy/L/-(3
-tert butylphenol)%2.2'-methylenebis(4-ethyl)v-6-tertbutylphenol
) v), 2,2'-methylenebis(4,6-diter)
t butylpheno-)v), 4,4'-methylenebis(3-methyl6-1ert, butylpheno-)V
), 4,4'-methylenebis(2,6-di-tert-butylphenol), 4,4'-methylenebis(2-methyl-6-tert-butylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenol) ), 4,4'-propylidene bis(2,6-di-tert-butylpheno-)v), 4,4'-cyclohexylidene bis(2,6-di-tert-butylpheno-)v), 4,4'-bis( 2,6-tert
7”f)V7!/-Az), 4.4'-
Bia, (2-tertbutylpheno-AI), 2,2
'-Methylenebis[6-(1-methylcyclohexyl)
-4-methylphenol], 4,4'-thiobis(3-
Methi) V-6-cerv Buti/L'7. Nord), 4
．． 4'-thiobis(2,6-di-tert-butylphenol), 4,4'-thiobis(2-methyl-6-te
rt; butylphenol), 2,2'-thiobis(4-
Methi) V-6-1ert butylphenol), 2,2
'-Thiobis(4,6-di-tert-butylphenol), 2,2'-thiobis(4,6-di-tert-butylresorcin), 1,1'-thiobis(2-naphtho-)
v ), 1.3.5-) rimethi) V-2,4,6-)
Squirrel (3,5-ditert spotted/l'-4-hi l'0
xybenzyl)benzene, 1,1,8-tris(5-t
ert butyl-4-hydroxy-2-methylpheni)
v) Butane, 1.3.5-t! J7. (3,5-Gt
ertbuty)v-4-hydroxybenzyl)isocyanurate, octadecyzlz-3-(3,5-diter
t-butyl-4-hydroxyphenyl) propionate,
6-(4-oxy-3,5-di-tert-butylanilino) -2,4-bis(n-octylthio) -1,
3,5-triazine, (4-oxy-3,5-dite
r t butyl benedi) v) ethyl phosphate ester, (
4-oxy-3,5-tertbutylbendi)V)
Octadecyl phosphate ester, tetrakis-[methylene-(3,5-di-tert7''thyl-4-hydroxyphenyl)gropionate]methane, 2,2'-thioerbinu(3-(3,5-di-tert, crtbutyl-4) -Hydroxypheni/L/)propionate], NIN'-
hexamethylene bis(3,5-di-tert-butyl-4
-hydroxyhydrocinnamamide), 1,6-hexanethiol bis-3-(3,5-di-tert7''thyl-hydroxyphenyl)propionate, etc. Among these alkylphenol compounds, 2,6-tertbutyl- 4-methylphenol=4-ter
t Butylcatechol, 2,2'-methylenebis(4-
methyl-5-tert-butylphenol), 2.2'
-methylenebis(4-ethyl)V6-verv butylpheno-/L/), 4+4'-thiobis(3-methyl-6
-tert-butylphenol) etc. are effective even when added in small amounts, so they do not impair the stability of the microcapsule oil thread, and they have three effects: improving the light resistance of printing, preventing discoloration of the CB surface, and preventing discoloration of the OB surface after printing. It is preferable to use it because it provides a well-balanced effect. In the present invention, the alkylphenol compound is generally 0.2 to 10 parts by weight per 100 parts by weight of the organic solvent containing the color former.
Preferably, it is added in an amount of 0.5 to 6 parts by weight, and adding too much is not only economically disadvantageous but also undesirable because it impairs the stability of the microcapsule oil thread.

The present inventors have discovered that by adding at least one compound represented by the following general formula (II or I) as a second component in addition to the alkylphenol compound described above into an organic solvent containing a color former. It has also been found that the three effects of improving light resistance aimed at by the present invention can be further enhanced.

(In the formula, R1, R2 and 几3 are respectively 04 to 02o alkyl group, phenyl group or C ("Cxo" represents an alkylphenyl group -t-0) (In the formula, R4 and chicken are respectively 01 to C6 R6 and R7 each represent an alkylene group and an alkyl group of q to 022.) Among the arsenous acid trialkyl ester compounds represented by the general formula (I), compounds particularly preferably used in the present invention include: Examples include tris(nonylpheny)V) phosphite, cy(nonylpheny)V)-dinonylphenylphosphite, diphenyl-isooctylphosphite, diphenyl-isodecylphosphite, triisooctylphosphite, triisodecylphosphite, etc. It will be done.

Furthermore, among the dialkyl ester derivatives of thioethers represented by general formula 1), compounds particularly preferably used in the present invention include dilaurylthiodipropionate, dimylinutylthiodipropionate, and dicetylthiodipropionate. , ditridecylthiodipropionate, laurylstearylthiodipropionate, distearyl-β・β'-thiodibutyrate, 3-carborauryloxyethyl-4'-carbolauryloxypropylthioether, 4-carbostearyloxy Examples include propyl-5'-propolauryloxybutylthioether.

In the present invention, at least one of the phosphorous acid trialkyl ester compounds or thioether derivatives is used in combination with an alkylphenol compound,
For example, it is also possible to use both of them together, and it is also of course possible to use different types of compounds together.

In addition, the amount of these second component compounds to be used is generally determined by the type of alkylphenol compound that is the first component, but the amount of organic solvent containing the color former is 10%.
It is preferable to use it in a range of 0.2 to 8 parts by weight relative to 0 parts by weight.

Furthermore, in the present invention, in addition to the alkylphenol compound and the phosphorous acid trialkyl ester compound or thioether derivative as the second component substance, as a third component substance, for example, p-benzquinone, α-naphthoquinone, β
- When one or more compounds such as quinones such as naphthoquinone and anthraquinone, nickel digityldithiocarbamate, α-tocopherol, and 1,1-diphenyl-2-picrylhydrazyl are simultaneously added to the organic solvent, even more It has also become clear that the light resistance improving effect of the present invention is enhanced. Among these third component substances, quinones and nickel dibutyldithiocarbamate are particularly effective, and the amount of these third component substances used is 0.1 to 3.0 parts by weight per 100 parts by weight of the organic solvent. is preferable.

The dye used in the present invention is not particularly limited, but the following specific examples may be mentioned.

3.3-bis(p-dimethylaminophenyl)=6-dimethylaminophthalide (hereinafter referred to as crystal violet lactone), 3,3-bis(p-dimethylaminophenyl)phthalide, 3-(p-dimethylamino phenyl)-3-(1,2-dimethylindo-)v-3-yl)phthalide, 8-(p-dimethylaminophenyl)-
3=(2-methylindol-3-yl)phthalide, 3
-(p-dimethylaminopheny/l/) -3-(2
-phenylindo-)v-3-i)v)phthalide, 3
,3-bis(1,2-dimethylindol-3-yl)
-5-dimethylaminophthalide, 3,8-bis(1,2
-dimethylindol-3-yl)-6-dimethylaminophthalide, 3,8-bis(9-ethylcarbazole-
3-yl)-5-dimethylaminophthalide, 3,3-bis(2-phenylindol-3-yl)-5-dimethylaminophthalide, 8-p-dimethylaminopheny/L
/-3-(1-methylpyrrol-2-yl)-6-dimethylaminophthalide and other triallylmethane compounds. 4
．． 4'-bis-dimethylaminobenzhydrin benzyl ether/l/, N-halophenyl-leucoauramine,
Diphenylmethane compounds such as N-2,4,5-trichlorophenylleucoonilamine. Rhodamine B-anilinolactam, Rhodamine B-(p-nitroanilino)lactam, Rhodamine B-(p-chloroanilino)lactam, ? -dimethylamino-2-methoxyfluorane, 7
-danitylamino-2-methoxyfluorane, 7-danitylamino-3-methoxyfluorane, 7-danitylamino-3-chlorofluorane, 7-danitylamino-3
-Chloro-2-methylfluoran, 7-danithylamino-2,3-dimethylfluoran, 7-dinithylamino(3-acetylmethylamino)fluoran, ? -diethylamino(3-methylamino)fluorane% 3.7
-Dinithylaminofluorane, 7-dinitylamino-3
-(Dibenzylamino)fluoran, ? -diethylamino-3-(methylbenzylamino)fluoran, 7-dinithylamino-3-(chloroethylmethylamine), 7
-dinithylamino-3-(diethylamino)fluorane, 2-(N-methyl-N-phenyl)amino-(3-(
N-ethyl-N-1)-)ruyl)aminofluorane,
2-Methyl-6-(N-p-)dyl-N-ethylamino)fluorane, 3-diethylamino-28-benzfluorane, 3-chloro-6-cyclohexylaminofluorane, 2-medicino-8-diethylaminobenz( C)
fluoran, 3-(N,N-diethylamino)-5-methyl-7-(N,N-dibenzylamino)fluoran,
3-diethylamino-7-cyclohexylaminofluorane, 3-diethylamino-7-(N-cyclohexyl-N-penu'ymino)fluorane, 2-anilino-3
-Methyl-6-(N-ethyl-P-)luidino)fluoran, 2-p-toluidino-3-methy)v-6-(N-
Ethyl-P-toluidino)fluorane, 3-(N-cyclohexyl-N-methylamino)-6-methy)v-7-
Xanthine thread compounds such as aminofluorane. Notiazine compounds such as benzoyl leucomethylene blue and p-nitrobenzyl leucomethylene blue. 3-Methyl-spiro-dinaphthopyran, 8-ethylunepyrodinaphthopyran, 3,3'-cyclospirodinaphthopyran, 3
-benzyl-spiro-dinaphthopyran, 3-methyl-naphtho=(3-methoxy-benzo)-spiropyran, 3-
Spirothread compounds such as propyl-spiro-dibenzopyran.

In the present invention, the nonvolatile organic solvent containing the coloring agent is not particularly limited, and one or more organic solvents used in the field of microcapsules for pressure-sensitive copying paper are normally selected and used. can do. Specifically, aromatic compounds such as petroleum, kerosene, xylene, toluene, trifluorocarbons, hydrogenated terphenyl, alkylnaphthalene, alkylated diphenylalkane, alkylated triphenyldimethane, alkylated diphenyl, etc. Hydrocarbons are generally used, and aliphatic hydrocarbons, alcohols, ketones, and esters may be mixed and used as appropriate.

The method for producing microcapsules is not particularly limited, and examples include a coacervation method using gelatin, gum arabic, etc. as a wall film-forming substance, and a synthetic capsule method using urea-formaldehyde, isocyanate, nylon, etc. as a wall film. Used as appropriate. Furthermore, in accordance with conventional techniques, adhesives such as silver powder, casein, polyvinyl alcohol, acrylamide synthetic polymers, stilt agents such as pulp powder, raw starch powder, dyes, etc. are used to improve stability over time, fluidity, adhesiveness, etc. By adding various auxiliary agents as appropriate, a color forming agent layer coating solution is prepared. Examples of methods for forming the color former layer on the support include coating methods such as an air knife coater, roll coater, Clavia coater, and plate coater, and various printing methods.

The coloring agent layer used in combination with the coloring agent layer in the pressure-sensitive copying paper of the present invention includes clay minerals such as acid clay, activated clay, attapulgite, zeolite, bentonite, etc., and organic materials such as tannic acid and gallic acid. The main ingredients are coloring agents such as acids, phenolic resins, and salicylic acid derivatives, and adhesives.
It is composed of inorganic pigments such as zinc oxide, titanium oxide, magnesium oxide, calcium carbonate, and various auxiliaries as necessary.

In order to make the effects of the present invention more clear, Examples and Comparative Examples are listed below, but the present invention is not limited to these Examples. Note that parts and % in one example represent parts by weight and % by weight, respectively, unless otherwise specified.

Example 1 2-(N-methyl-N-phenyl)amino-6-(N-ethyl-N-p) was added as a coloring agent in a mixed organic solvent consisting of isopropyl v. 80 parts naphthalene and 20 parts tokerosin.
-) Louis) v) Aminof! 4 parts of leolane was dissolved, and then 2,2'-methylenebinu(4-methyl-6-tert) was dissolved.
Butylphenol) was dissolved in 4 parts to obtain a coloring agent oil. Separately, 20 parts of pork skin acid-treated gelatin and 20 parts of gum arabic were dissolved in 500 parts of water at 60°C, and a coloring agent oil was mixed into this solution and emulsified and dispersed until the emulsion particle size became 5μ. . To this dispersion, 800 parts of warm water at 60°C was added under stirring, and then 10% acetic acid was added to increase the pH of the liquid.
Coacervation was caused by adjusting H to 4.2.

The liquid was further cooled while stirring to gel the formed coacervation film, and after the liquid temperature reached 10'C, 12 parts of a 37% formalin solution was added, followed by a 5% aqueous solution of caustic soda. Adjust the pH to 9 and stir for 4 more times.
A capsule dispersion was prepared by continuing for an hour.

To the obtained capsule dispersion, 30 parts of pulp powder and 15 parts of starch solution (as solid content) were added to 100 parts of capsule solid content, and water was further added to form a color former layer coating liquid with a solid content concentration of 15%. Prepared.

The obtained color forming agent layer coating liquid was applied onto a base paper so that the dry coating amount was 41/d and dried to obtain a top paper.

Example 2 The upper paper was obtained in exactly the same manner as in Example 1, except that 4 parts of tris(nonylphenyl)phosphite was further added to 100 parts of the mixed organic solution in the color former oil. Ta.

Example 3 A top paper was obtained in the same manner as in Example 2, except that 0.5 part of nickel dibutyldithiocarbamate was further added to the color former oil.

Example 4 A top paper was obtained in the same manner as in Example 2, except that 4 parts of dilauryl thiodipropionate was used in place of tris(nonylphenyl)phosphite.

Comparative Example 1 An upper paper was obtained in the same manner as in Example 1 except that 2,2'-methylenebis(4-methyl-6-'certbutylpheno-)v) was not used.

Comparative Example 2 The same procedure as in Example 1 was carried out except that 4 parts of bispheno-/l/A was used instead of 2,2/-methylenebis(4-methyl-6-tertbutylpheno-)v). and obtained the upper paper.

Example 5 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)'-5-chlorobenzotriazole 2 in an organic solvent consisting of 100 parts of isopropylnaphthalene
2.2'- 2 parts of methylenebis(4-methyl-6-tert-butylphenol), 2 parts of dilaurylthiodipropionate, and dibutyldithiocarbamate/V0
．． A color former oil was prepared by adding 5 parts.

A top paper was obtained in exactly the same manner as in Example 1 except that this color former oil was used.

Example 6 A top paper was obtained in the same manner as in Example 5, except that 2,2'-methylenebis(parts) was used.

Example 7 Same as Example 5 except that 2 parts of nitrine (nonylphenyl) phosphite was used instead of dilaurylthiodipropy, l-) and 0.5 part of anthraquinone was used instead of nickel dibutyldithiocarbamate. A top paper was obtained in the same manner as in Example 5.

Comparative Example 3 Example 5 except that 2,2'-methylenebis(4-methyl-6-tertbutylpheno-7L/ ), dilaurylthiodipropionate, and nickel digityldithiocarbamate were not used in Example 5. I did the same thing and got the top paper.

Example 8 To a mixed solvent consisting of 90 parts of hydrogenated terphenyl and 74,710 parts of chlorinated para, 3 parts of crystal violet lactone as a coloring agent and 1 part of penzoyl leucomethylene prepolymer were added.
After dissolving 1 part, 2 parts of 2,2'-methylenebis(4-methyl-6-tertbutylpheno-)v) and 2 parts of trino(nonylphenyl)phosphite were added to prepare a color former oil. A top paper was obtained in exactly the same manner as in Example 1 except that the obtained color former oil was used. Example 9 In Example 8, 2.2'-methylenebis(4-methylene)v-6 -vert butylphenol) in place of 4-'
A top paper was obtained in the same manner as in Example 8, except that 2 parts of tert-butylcatechol and 0.5 part of β-naphthoquinone were also used as a coloring agent oil.

Comparative Example 4 The same procedure as in Example 8 was carried out except that 2,2'-methylenebis(4-methyl-6-'cert butylphenol) and human linu (nonylphenyl/L/) phosphite were not used in Example 8. and obtained the upper paper.

Preparation of bottom paper 100 parts of activated clay, IO parts of 20% caustic soda.

A coloring agent coating liquid was prepared by mixing 20 parts of styrene-butadiene latex (as solid content) and 300 parts of water,
This coating liquid was applied onto the base paper so that the dry coating amount was 6117 d and dried to obtain the lower paper.

Evaluation test (1) CB surface white After irradiating the 13 types of upper paper obtained in Examples 1 to 9 and Comparative Examples 1-4 with the coloring agent layer coated side facing up and irradiating it with sunlight for a total of 30 minutes and 60 minutes. The coloring of the coloring layer was evaluated visually. The results are shown in Table 1.

(II) Color development of printing after OB surface light resistance The coloring agent layer of the lower paper was superimposed on the coloring agent layer of the upper paper that was irradiated with sunlight in (1), and color was developed by applying a load pressure of 600 kQA2. . The spectral absorption curve of the colored coloring agent layer was measured using a UVIDEC-505 self-recording spectrophotometer manufactured by JASCO Corporation. Separately, the upper paper, which had not been exposed to sunlight, was combined with the lower paper to develop color in the same manner, and the spectral absorption curve was similarly measured.

From each of the obtained spectral absorption curves, two or one maximum absorption wavelength λ1. The light resistance value A was determined from the following equation by reading λ2 and using the absorption concentration at the maximum absorption wavelength. The results are listed in Table 1.

(Il+) Printing Light Resistance A lower paper was superimposed on each of the 13 types of upper paper obtained in Examples and Comparative Examples, and color was developed by applying a load pressure of 600 kq/G+2. After the colored paper was left in a dark place for 1 hour, the spectral absorption curve was measured.The colored surface was then irradiated with sunlight for 1 hour and 3 hours, and each spectral absorption curve was measured. From the spectral absorption curves before and after sunlight irradiation, the absorption maximum wavelength λ3. The light fastness value B was determined from the absorption density at each absorption maximum wavelength using the following formula, and the results are shown in Table 1.

As is clear from the results in Table 1, the pressure-sensitive copying paper obtained in each example of the present invention showed little coloring on the 08 side even when exposed to sunlight, and furthermore, there was no difference in the prints recorded after sunlight irradiation. However, there is little shift in the absorption maximum wavelength of the colored image and a decrease in the absorption density, so the color development of the print after light resistance on the CB surface is excellent, and there is also less discoloration of the print due to sunlight irradiation, and these three light resistance properties are improved in a well-balanced manner. It was an extremely superior pressure-sensitive copying paper.

Patent Applicant Kanzaki Paper Co., Ltd. Procedural Amendment August 19, 1980 Patent Application No. 87042 of 1987 3, Person making the amendment 4, Agent address (〒660) Kanzaki Paper Co., Ltd. 1-11 Jokoji Motomachi, Amagasaki City In-house 5, Date of amendment order Voluntary 6, Subject of amendment Column 7 of "Detailed explanation of the invention" of the specification, Contents of amendment As shown in the attached sheet 7, Contents of amendment (1) Page 5 of the specification, 13~ Line 14 “...3.5
-di-tert-butyl-4-hydroxybenzyl alcohol,"
-oxymethylphenol,” is corrected.

(2) In lines 5-4 from the bottom of the fifth page of the specification, "...butylhydroxyanisole," is corrected to "...2-butyl-4-methoxyphenol," and in addition, in the second line from the bottom of the same page, After “...-tar tbutylphenol,” “
2.4-dimethyl-6-(2'-methylcyclohexyl)phenol.

(3) “...3-tart” on page 6, lines 1 to 3 of the specification
Butylhydroquinone, 3.5-di-tartbutylhydroquinone, 3.5-di-tertamylhydroquinone,"...2-tartbutylhydroquinone, 2-tartbutylhydroquinone, 2-tartbutylhydroquinone,
．． 6-di-tsrt-butylhydroquinone, 2.6-di-tert-amylhydroquinone," and then in the 6th line from the bottom of the same page, after "...di-te(1) rt-butylphenol),"r4,4' -isopropylidene bis(2,6-di-tert-butylphenol),'' is added.

(4) "...6-(1-methylcyclohexyl)-4-methy..." on the last line of page 6 of the specification is replaced with [...6-(α
-methylcyclohexyl)-4-methy...''.

(5) On page 15, line 3 of the specification, [...lmethylamine),...'' is corrected to [...lmethylamino)fluoran.''

that's all (2) 513

Claims (2)

[Claims] (1) In a pressure-sensitive copying paper using microcapsules encapsulating a non-volatile organic solvent containing a coloring agent, the organic solvent contains 0.2 to 10 parts by weight of an alkylphenol compound per 100 parts by weight of the organic solvent. Pressure-sensitive copying paper that is characterized by its tightness. (2) In the organic solvent, the following general formula (I) or (
The pressure-sensitive copying paper according to claim 1, which contains at least one compound represented by II) in an amount of 0.2 to 8 parts by weight per 100 parts by weight of an organic solvent. (In the formula, ・R, ・R2 and R3 each represent a 04-C20 alkylalkylphenyl group.) (In the formula, R4 and RS each represent a 01-C20 alkylene group, and R6 and R1 each represent a C8-C22 alkylene group. )