JPH0470374A - Manufacture of pressure-sensitive copying sheet - Google Patents

Abstract

PURPOSE:To enhance the abrasion resistance of a pressure-sensitive sheet by adding an adhesive to a capsule ink containing an ultraviolet ray-curable compound in its basic component. CONSTITUTION:A capsule ink consisting basically of a microcapsule containing a chromogen material, a volatile organic solvent, an adhesive, an ultraviolet ray-curable compound and a photopolymigration initiator, is used for printing on a support, and then is allowed to become cured. The strength off film formed by the insufficient polymerization of the ultraviolet ray-curable material does not deteriorate, if the ink is used for printing at high speed, as the adhesive is added to the capsule ink. Subsequently, no fouling due to the friction of a pressure-sensitive cpoying sheet occurs. In addition,the pressure-sensitive copying sheet obtained using a comparatively compact drying device demonstrates superb color development properties and improved translucency thanks to the mentioned constitution.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for producing pressure-sensitive copying paper using microcapsule ink, and particularly relates to a method for producing pressure-sensitive copying paper having particularly good performance using a relatively small drying device. The present invention relates to an easy manufacturing method using.

(Prior art) A combination of an electron-donating color former such as crystal violet lactone or benzoyl leucomethylene blue and an electron-accepting color developer such as activated clay, a phenol-formaldehyde condensate, or a polyvalent metal salt of an aromatic carboxylic acid. Various chromogen substances, such as combinations of nickel carboxylates and N,N-dibenzyl-dithiooxamide, organoferric phosphates and metal salts such as lauryl gallate, and ligand compounds. Pressure-sensitive copying paper that utilizes the principle of color development through reaction is well known.

In general, such pressure-sensitive copying paper is manufactured by phase separation method, solid state method,
Upper paper (cB) in which microcapsules containing a chromogen substance prepared by a method such as the 1n-situ method are coated on a support
, a base paper (cF) in which the support is coated with another chromogen substance that reacts with the chromogen substance to form a color, and a medium in which the microcapsules and the chromogen substance are coated on separate sides of the support. Paper (cFB) is used in appropriate combinations.

In addition, there is also a so-called single-piece pressure-sensitive copying paper in which the above-mentioned microcapsules and chromogen material are coated as a laminated or mixed layer on the same side of a support, and a capsule layer is further coated on the back side of the single-piece pressure-sensitive copying paper. There are individual pressure-sensitive copying paper sets, etc., in which the above-mentioned bottom paper and middle paper are appropriately combined.

Normally, these pressure-sensitive copying papers are manufactured by applying water-based paint to a support using a large coating machine, but a special manufacturing method involves converting the capsules into ink and spot-printing it using a printing machine. There is a way.

Capsule ink spot printing allows expensive capsule paint to be printed only on the necessary areas of the support, so compared to the method of applying water-based paint to the entire surface of the support using a large coating machine, for example, it is possible to print color tones locally. It can be used in a variety of ways, such as producing copies of paper with different colors, and depending on the desired product, it can exhibit extremely excellent economical features. However, while the printing method has great advantages over the method using a coating machine, it still has some aspects that cannot be said to be sufficient depending on the method.

For example, in order to obtain pressure-sensitive copying paper with good color development by applying capsule ink to a support, it is necessary to apply as much as possible. When used, a large drying device is required to evaporate a large amount of solvent, and if the solvent used is alcohol, there is a disadvantage that the paper tends to wrinkle. On the other hand, when using ultraviolet curable capsule ink, it can be manufactured using smaller drying equipment compared to when using evaporative drying type ink, but the proportion of resin blended with evaporative drying type ink is Because it is relatively expensive, the printed area tends to become transparent, and furthermore, it is affected by the resin,
Since the capsule is difficult to be crushed, the coloring properties tend to be inferior.

In addition, the present inventors have achieved color development by using a capsule ink whose basic components are microcapsules containing a chromogen substance, an alcohol-based volatile organic solvent, an ultraviolet curable compound, and a photopolymerization initiator. It has been discovered that pressure-sensitive copying paper with good opacity in printed areas and without wrinkles can be obtained using a relatively small drying device (Japanese Patent Application No. 1-279301). The method may not be sufficient depending on the conditions; for example, when printing at high speed, the polymerization of the UV-curable substance tends to be insufficient, reducing the strength of the formed film, so it may not be possible to attach it to the support of the capsule. This results in insufficient fixation, and the resulting pressure-sensitive copying paper has the drawback of being easily stained by friction.

(Problems to be Solved by the Invention) An object of the present invention is to eliminate the above-mentioned drawbacks when manufacturing pressure-sensitive copying paper using capsule ink, and to facilitate production of pressure-sensitive copying paper with higher practicality. The present invention provides a method for manufacturing.

(Means for Solving the Problems) The present invention comprises (a) microcapsules containing a chromogen substance, Φ) a volatile organic solvent, (c) an adhesive, (d) an ultraviolet curable compound, and (e ) A method for producing pressure-sensitive copying paper, which comprises printing a capsule ink containing a photopolymerization initiator as a basic component on a support and curing it.

(Function) The present inventors have discovered that by adding an adhesive to the ink, the decrease in film strength caused by insufficient polymerization of the ultraviolet curable compound in the ink during high-speed printing can be compensated for. The present invention was completed after discovering that the abrasion resistance of pressure-sensitive copying paper can be improved.

Examples of the chromogen substance used in the present invention include a combination of an electron-donating color forming side and an electron-accepting color developer, or a combination of a metal salt and a ligand compound.

Examples of the electron-donating coloring agent include the following substances known in the field of pressure-sensitive copying paper.

3.3-bis(p-dimethylaminophenyl)=6-dimethylaminophthalide, 3-(P-dimethylaminophenyl)-1(1,2-dimethylindol-3-yl)
Phthalide, 3,3-bis(1,2-dimethylindol-3-yl)-5dimethylaminophthalide, 3,3-bis(9-ethylcarbazol-3-yl)-6-dimethylaminophthalide, etc. triallylmethane dye, 4゜4
'-bis-dimethylaminobenzhydrylbenzyl ether, N-halophenyl-leucoolamine, N-2,
Diphenylmethane dyes such as 4,5-1-lichlorophenylleucoolamine, thiazine dyes such as benzoylleucomethylene blue and P-nitrobenzoylleucomethylene blue, 3-methyl-spiro-dinaphthopyran, 3
-Phenyl-spiro-dinaphthopyran, 3-propyl-
Spiro dyes such as spiro-dibenzopyran, lactam dyes such as rhodamine-B-anilinolactam, rhodamine (0 chloroanilino) lactam, rhodamine (0 chloroanilyl) lactam, 3-dimethylamino-7-methylfluoran, 3- diethylamine-6-methyl-7-
Chlorofluorane, 3-(N-ethyl-p-toluidino)7-methylfluorane, 3-diethylamino 7-N-
Methylaminofluorane, 3-diethylamine-7-sibenzylaminofluorane, 3(N-ethyl-p-toluidino)-6-methyltophenylaminofluorane,
3-diethylamino-6-methyl-7-phenylaminofluorane, 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-phenylaminofluorane,
Fluoran dyes such as 3-piperidino-methyl-7-phenylaminofluorane and 3-diethylamino-6-methyl-7-quizyridinofluorane, 3.3-bis[2-(
Infrared coloring dyes such as p-dimethylaminophenyl)-2-(p-methoxyphenyl)ethylene-2-yl)-4,5,6,7-titrachlorophthalide, and mixtures thereof.

Examples of the electron-accepting color developer include the following substances known in the field of pressure-sensitive copying paper.

Acid clay, activated clay, attapulgite, zeolite,
Clays such as bentonite, phenolic resin, special public interest
Polyvalent metal salts of various aromatic carboxylic acids as described in No. 1-25174, 2 as described in JP-A-54106316
．． Zinc salts of 2'-bisphenol sulfone compounds, etc., and mixtures thereof.

Examples of the combination of a metal salt and a ligand compound include the following combinations known in the field of pressure-sensitive copying paper.

Nickel stearate and N,N'-henzyl-thiohoxamide, nickel laurate and α-benzylglyoxime, tricaprylmethyl ammonium vanadate and dodecylamine 8-hydroxyquinolinesulfonate, hensyl lauryl dimethyl molybdate. Ammonium and lauryl protocatechuate, titanium stearate and lauryl gallate, iron naphthenate and benzyl gallate, polyferrophenylmethylsiloxane and methylenebis(8-oxyquinoline), copper palmitate and N,N'
-bis-2-octanoyloxyethyldiethyldithiooxamide, cobalt laurate and di-0-)lylguanidine, hinokitiol and polyvanadophenylmethylsiloxane, and organoiron phosphate described in JP-A-58-38191. Combinations such as lauryl gallate and mixtures thereof.

When microencapsulating chromogen substances such as those mentioned above,
The chromogen substance is usually encapsulated in a state dissolved in oil, and examples of such oil include the following substances.

Aromatic carbonization of vegetable oils such as cottonseed oil, mineral oils such as kerosene, paraffin, naphthenic oil, and chlorinated paraffin, alkylated biphenyls, alkylated terphenyls, alkylated naphthalenes, diarylethanes, triarylmethanes, diphenylalkanes, etc. Hydrogens, oleyl alcohol, tridecyl alcohol, benzyl alcohol, 1-
Alcohols such as phenylethyl alcohol and glycerin, organic acids such as oleic acid, dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, dioctyl phthalate, diethyl adipate, propyl adipate, di-n-butyl adipate, adipic acid Esters such as dioctyl, organic phosphoric acid compounds such as tricresyl phosphate, tributyl phosphate, tributyl phosphite, and triptyl phosphoxamide, ethers such as phenyl cellosolve, pendyl carbitol, polypropylene glycol, and propylene glycol monophenyl ether. Amides such as methyl lauramide, N, N-dimethyl stearamide, N, N'-dihexyl octylamide, ketones such as diisobutyl ketone and methylhexyl ketone, ethylene carbonate, propylene carbonate, etc. alkylene carbonates, etc. and mixtures thereof.

The amount of the chromogen substance to be blended is usually adjusted to 1 to 80 parts by weight per 100 parts by weight of the oil.

As the encapsulation method, the conventionally known coacervation method, interfacial polymerization method, 1n-situ method, etc. can be selected and used as appropriate, but it is preferable to use synthetic resin as the wall material, and among them, melamine formaldehyde resin is preferable. Capsules coated with are particularly preferred because pressure-sensitive copying paper with better quality such as color clarity can be obtained. Note that these microcapsules can also contain antioxidants, ultraviolet absorbers, etc., if necessary.

Examples of volatile organic solvents used in the present invention include benzene, toluene, xylene, cyclohexane,
Hexane, trichlorethylene, ligroin, methyl isobutyl ketone, methyl acetate, ethyl acetate, butyl acetate, methyl cellosolve, ethyl cellosolve, butyl cellosolve, diethylene glycol, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, methanol, ethanol, n-propyl alcohol, isopropyl alcohol , n-butanol, n-hexanol, cyclohexanol, 2-ethylhexyl alcohol and the like. Among these, alcohols having 3 or less carbon atoms are particularly preferred in terms of drying properties under high-speed printing.

Examples of the ultraviolet curable compound include compounds having one or more, preferably a plurality of vinyl or vinylidene groups, specifically having an acryloyl group, a methacryloyl group, an allyl group, an unsaturated polyester, a vinyloxyacrylamide group, etc. Examples include compounds. The most typical compounds are the reaction products of polyols, polyamines, amino alcohols, etc. and unsaturated carboxylic acids, and the reaction products of hydroxyl group-containing acrylates or methacrylates and polyisocyanates. Typical compounds include, for example, polyethylene. Glycol diacrylate, propylene glycol dimethacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, hexanediol diacrylate, 1,2-butanediol diacrylate, reaction product of epoxy resin and acrylic acid, methacrylate Examples include reaction products of acids, pentaerythritol, and acrylic acid, condensates of maleic acid, diethylene glycol, and acrylic acid, methyl methacrylate, styrene, and mixtures thereof.

The blending ratio of the volatile organic solvent and the ultraviolet curable compound is usually in the range of 95:5 to 10:90 (parts by weight), more preferably in the range of 80:20 to 20:80 (parts by weight). range. Among these, when curing the smear ink using only an ultraviolet irradiation device, a range of 65:35 to 20:80 is preferable, and when curing the smear ink using a combination of an ultraviolet irradiation device and an evaporative drying device, a ratio of 80: 20~
A range of 40:60 is preferred.

Examples of the photopolymerization initiator include aromatic ketones, quinone compounds, ether compounds, nitro compounds, etc., and specific examples include benzoquinone, phenanthrenequinone, naphthoquinone, diisopropylphenanthrenequinone, benzoin butyl ether, benzoin, and furoin. Examples include butyl ether, Michler's ketone, Michler's thioketone, fluorenone, trinitrofluorenone, β-benzoylaminonaphthalene, and the like.

The amount of the photopolymerization initiator is usually in the range of 0.1 to 10 parts by weight per 100 parts by weight of the ultraviolet curable compound.

Furthermore, the adhesives used include acrylic resin, methacrylic resin, vinyl acetate resin, polystyrene resin, xylene resin, coumaron resin, petroleum resin, phenol resin, resorcinol resin, urea resin, melamine resin, ketone resin, unsaturated polyester resin, Examples include polyamide resin, polyvinyl formal resin, polyvinyl butyral, nitrocellulose, eral cellulose, ethylhydroxyethylcellulose, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, and the like. Among these, it is particularly preferable to use cellulose derivatives because the effect of improving the abrasion resistance of the present invention is noticeable. In addition, the blending amount of the adhesive is 0.1 to 500 parts by weight per 100 parts by weight of the ultraviolet curable compound,
More preferably, it is 1 to 300 parts by weight.

In the ink of the present invention, a sensitizer for increasing the efficiency of photopolymerization, a white pigment, a color desensitizing component, a capsule protectant, an antioxidant, a fluorescent dye, a plasticizer, etc. are added as necessary. be able to.

Examples of the sensitizer include triethanolamine, N-methyljetanolamine, N,N-dimethylethanolamine, and N-methylmorpholine.

Examples of white pigments include inorganic pigments such as zinc oxide, titanium oxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, magnesium silicate, calcium silicate, calcium sulfate, calcium phosphate, and colloidal silica, and organic pigments such as melamine resin and urea resin. etc.

In the case of leuco-based recording materials, color desensitizing components include:
Examples include various amino compounds, and in the case of iron chelate recording materials, organic phosphorus compounds and compounds having aminocarboxylic acid groups as described in JP-A No. 59-38089 are used.

When the volatile organic solvent used is a water-miscible solvent such as methanol or ethanol, dispersion of the chromogen substance-containing microcapsules in an ink medium containing the above-mentioned components is carried out using an aqueous capsule dispersion. It is also possible to remove the water by repeating washing and filtration several times with this solvent after filtration, and then redispersing the obtained cake-like capsules in the ink medium. However, usually, the aqueous capsule dispersion is used as the prepared dispersion, or after passing through a concentration process such as filtration, through air drying, surface drying, fluidized drying, flash drying, spray drying, vacuum drying, and freezing. This is done by removing the dispersion medium by drying, infrared drying, high frequency drying, ultrasonic drying, pulverization drying, etc. to form powder capsules, and then dispersing the powder capsules in an ink medium.

The amount of capsules added to the ink medium is usually 100% of the ink medium (volatile organic solvent + ultraviolet curable compound).
It is in the range of 2 to 100 parts by weight, preferably 7 to 60 parts by weight, based on the weight of the capsule.

The chromogen substance-containing capsule ink prepared by
Coating by flexographic printing, gravure printing, offset printing, letterpress printing, screen printing, etc. on a suitable support such as paper or synthetic paper, or on the back or front surface of a receptor sheet formed by providing a receptor layer on the support. It is used as top paper, middle paper, and stand-alone pressure-sensitive copying paper. In addition, if an ink prepared by adding another chromogen substance that reacts with the chromogen substance contained in the capsule to form a color to the capsule ink is applied to a support, a single pressure-sensitive copying paper can be obtained. .

Drying and curing of ink is usually done by using a small hot air or infrared drying device in combination with an ultraviolet irradiation device, but depending on the type and amount of solvent used, only the ultraviolet irradiation device may be sufficient.

In particular, when an alcohol is used as the volatile organic solvent, it is easy to cure using only an ultraviolet irradiation device, which is the most preferred embodiment of the present invention.

The amount of capsule ink to be applied is determined appropriately depending on the type of ink prepared, and is not particularly limited, but is generally 0.3 to Log/bo, preferably 2 to 7 g on dry weight. It is in the range of /bo.

The chromogen substance forming the receptor layer is a substance that develops color by reacting with the chromogen substance encapsulated in the capsule, and these are pulverized using a ball mill, attritor, sand mill, etc. as necessary. After that, ordinary white pigments, binders, and various auxiliary agents such as dispersants, colored dyes, fluorescent whitening agents, ultraviolet absorbers, antioxidants, and antifoaming agents are added as necessary to form an aqueous coating liquid. It is prepared as

As for the white pigment, the same types as those exemplified as substances added to the capsule ink coating layer can be used,
As the binder, various types of binders such as water-soluble or latex type binders are used.

Examples of water-soluble binders include proteins such as gelatin, albumin, and casein; starches such as cereal starch, pregelatinized starch, oxidized starch, etherified starch, and esterified starch;
Water-soluble natural polymer compounds such as celluloses such as carboxymethyl cellulose and hydroxyethyl cellulose, agar, sodium alginate, sucrose such as gum arabic, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, polyacrylamide, vinyl acetate-maleic anhydride Examples include water-soluble synthetic polymer compounds such as sodium salts of , maleic acid copolymer salts such as ammonium salts of styrene-maleic anhydride, and sodium salts of butadiene-methacrylic acid.

Examples of latex binders include styrene-butadiene latex, acrylonitrile-butadiene latex, acrylic ester latex, vinyl acetate latex, methyl methacrylate-butadiene latex, and carboxy-modified latexes thereof (e.g., acrylic acid).
Examples include latex.

The receptive layer forming coating solution prepared in this way is coated on paper, synthetic paper, etc. by various known coating methods such as an air knife coater, roll coater, blade coater, size press coater, curtain coater, bill blade coater, short dwell coater, etc. Coated on various supports.

The coating amount of the receptive layer forming coating liquid is appropriately determined depending on the type of the coating liquid prepared and is not particularly limited, but is generally 2 to 15 g/rrr in terms of dry weight, preferably 3 g/rrr. ~1 g/rrT.

"Examples" In order to make the effects of the present invention even clearer, Examples and Comparative Examples are listed below, but the present invention is not limited to these Examples.

In addition, unless otherwise specified, parts and % in the examples represent parts by weight and % by weight, respectively.

Example 1 (Preparation of capsules) 8 parts of crystal violet lactone was mixed with 100 parts of alkyldiphenylethane (trade name Hysol 5AS-296).
, manufactured by Nippon Petrochemical Co., Ltd.) to obtain internal phase oil. Ethylene-maleic anhydride copolymer (trade name EMA31.
20% to 200 parts of a 3.0% aqueous solution (manufactured by Monsanto)
Aqueous caustic soda solution was added dropwise to the solution to adjust the pH to 6.0.
After emulsifying the internal phase oil, the system was heated to 55°C.

Separately, 15 parts of melamine was added to 45 parts of a 37% formaldehyde aqueous solution and reacted at 60°C for 15 minutes to prepare a prepolymer aqueous solution.

This aqueous prepolymer solution was added dropwise to the emulsion, and then O,IN-hydrochloric acid was added dropwise while stirring to adjust the pH to 5.
3, heated to 80'C, held at that temperature for 1 hour, lowered the pH to 3.5 with 0.2N hydrochloric acid, kept warm for an additional 3 hours, and then allowed to cool until the average particle size was 3°. A 0μ capsule dispersion was obtained.

Next, this capsule dispersion was filtered and air-dried to obtain powder capsules.

(Preparation of capsule ink) Add 30 liters of ethanol to ethyl cellulose (trade name N-4)
100 parts of the above-mentioned powder capsules were dispersed in a solution obtained by adding 15 parts of 15 parts (manufactured by Vercules), and 300 parts of pentaerythritol triacrylate and 10 parts of benzoin were added to obtain a capsule ink.

(Preparation of upper paper) After flexographically printing the above capsule ink on a base paper of 40 g/n, the ink was cured with an ultraviolet irradiation device to obtain a spot printed matter with an ink amount of 4.0 g/rri. The printed matter had no wrinkles and the opacity of the printed area was good.Furthermore, even when printing at a speed of 130 m/min, no stains were generated on the guide roll.

(Creating the bottom sheet) 65 parts of light calcium carbonate, 20 parts of zinc oxide, 3.5-
Mixture of zinc di(α-methylbenzene)salicylate and α-methylstyrene/styrene copolymer (melt ratio 80/
20) Add 20 parts (solid part) of carboxy-modified styrene-butadiene copolymer latex to a dispersion obtained by grinding 15 parts of polyvinyl alcohol aqueous solution (solid part) and 300 parts of water in a ball mill for 24 hours. In addition, the prepared color developer coating liquid was applied to base paper of 40 g/rrr using an air knife coater so that the dry weight was 5 g/rrr to obtain a base paper.

(Evaluation of color development and abrasion resistance) When the obtained upper paper and lower paper were overlapped and printed using a typewriter, a good colored image was obtained. Further, as a result of stacking the upper paper and the lower paper and rubbing their surfaces against each other 10 times under a pressure of 100 g/cd, the dirt on the lower paper was at a level that would pose no practical problem.

Comparative Example 1 Ethyl cellulose (trade name N-4, manufactured by Vercules)
A capsule ink was prepared in the same manner as in Example 1, except that 15 parts was not added, and a top paper was obtained in the same manner as in Example 1.

(Evaluation) The obtained upper paper had no wrinkles at all, and the opacity of the printed areas was also good. Furthermore, even when printing at a speed of 130 m/min, almost no stains were generated on the guide roll.

Further, when this upper paper and the lower paper obtained in the same manner as in Example 1 were overlapped and printed using a typewriter, a good colored image was obtained. However, if the top paper and bottom paper are overlapped, 100
As a result of friction between surfaces 10 times back and forth under a pressure of g/c11,
The bottom paper was stained to the level of an interlayer.

Example 2 (Preparation of capsule ink) 50 parts of nitrocellulose (trade name: Nitrified cotton FQ type SSI/4, manufactured by Daicel Chemical Industries, Ltd.) was added to 700 parts of ethanol.
100 parts of powder capsules obtained in the same manner as in Example 1 were dispersed in the solution obtained by adding 1 part of trimethylolpropane triacrylate, 10 parts of benzoin butyl ether, and 1 part of N,N-dimethylethanolamine. 1 and 50 parts of an acrylic resin (trade name: Aron S-4080, manufactured by Toagosei Co., Ltd.) to obtain a capsule ink.

(Preparation of upper paper) After flexographic printing the obtained capsule ink on base paper of 40g/rrl, the ink was cured with a small hot air dryer and ultraviolet irradiation equipment, and spot printing was performed with an ink amount of 4.5g/rrl. I got the top paper. Incidentally, no wrinkles were observed on the obtained upper paper, and the opacity of the printed areas was also good. Further, even when printing at a speed of 130 m/min, no stains were generated on the guide roll.

(Evaluation of Color Development and Abrasion Resistance) When the obtained upper paper and the lower paper obtained in the same manner as in Example 1 were overlapped and printed using a typewriter, a good colored image was obtained. Also, stack the top paper and bottom paper to 100g/cd.
As a result of rubbing the surfaces against each other 10 times under the pressure of

Comparative Example 2 The capsule ink of Example 2 was prepared in the same manner as in Example 2 except that 50 parts of nitrocellulose (nitrified cotton SSI/4) and acrylic resin (Aron S-4080) were not added. Obtained.

(Evaluation) The obtained upper paper had no wrinkles at all, and the opacity of the printed areas was also good. Further, even when printing at a speed of 130 m/min, there was almost no staining on the guide roll.

Further, when this upper paper and the lower paper obtained in the same manner as in Example 1 were overlapped and printed using a typewriter, a good colored image was obtained. However, if the upper paper and lower paper are overlapped and
As a result of rubbing the surfaces together 10 times under a pressure of /c-ml,
Problematic level of staining occurred on the bottom paper.

〔effect〕

With the method of the present invention, pressure-sensitive copying paper with good performance could be produced very efficiently.

Claims (4)

[Claims] (1) (a) Microcapsules containing a chromogen substance,
A capsule ink whose basic components are (b) a volatile organic solvent, (c) an adhesive, (d) an ultraviolet curable compound, and (e) a photopolymerization initiator is printed on a support and cured. A method of manufacturing pressure-sensitive copying paper. (2) Claim in which the volatile organic solvent is an alcohol (
1) The method for producing pressure-sensitive copying paper as described above. (3) Claim (1) or (2) wherein the blending ratio of the volatile organic solvent and the ultraviolet curable compound is in the range of 65:35 to 20:80, and the smear ink is cured only by the ultraviolet irradiation device.
A method for manufacturing the pressure-sensitive copying paper described. (4) The blending ratio of the volatile organic solvent and the ultraviolet curable compound is in the range of 80:20 to 40:60, and the smear ink is cured using a combination of an evaporative drying device and an ultraviolet irradiation device, or (2) The method for producing pressure-sensitive copying paper.