JPH0712735B2 - Developer composition for pressure-sensitive copying paper - Google Patents

Description

TECHNICAL FIELD The present invention relates to a color developer composition for pressure-sensitive copying paper, and more specifically, to a metallization of a novel salicylic acid co-condensed resin, benzotriazole. The present invention relates to a color developer composition for pressure-sensitive copying paper containing a compound.

(Prior Art) Pressure-sensitive copying paper is also called carbonless paper, and it is a copying paper that can be colored simultaneously by mechanical or shock pressure, such as writing, typewriter, etc., and can make multiple copies at the same time. There is a type, a simple color paper, or the like, and the coloring mechanism is based on a color reaction between an electron-donating colorless dye and an electron-accepting color developer. (1) USP2,71 as an electron-accepting developer
2,507 Inorganic solid acids such as acid clay and attapal guide, (2) Substituted phenols and diphenols disclosed in JP-B-9309, (3) JP-B-42
-A p-substituted phenol-formaldehyde polymer disclosed in 20144, (4) Aromatic carboxylic acid metal salts disclosed in JP-B-49-10856 and JP-B-52-1327, and the like have been proposed, and partially used. Has been converted.

The performance that a color developing sheet containing such a color developing agent for pressure-sensitive copying paper should have is excellent color development that does not change even after the sheet is manufactured and after long-term storage, and at the time of storage and exposure to radiation such as sunlight. Examples thereof include little yellowing, a robust color image, and no easy disappearance or discoloration by radiation, water or a plasticizer.

Conventionally proposed sheets coated with a color developer have advantages and disadvantages in performance. For example, inorganic solid acids are inexpensive, but when stored, gas in the air and moisture are adsorbed to cause yellowing of the paper surface and deterioration of color development performance, and substituted phenols have insufficient color development and the density of a color image is low. Low. p used as a p-substituted phenol formaldehyde polymer
The phenylphenol-novolak resin has excellent color-developing properties, but the coated paper is yellowed during exposure to sunlight or during storage (particularly, nitrogen oxides in the air), and the color-developed image remarkably fades. Further, the aromatic carboxylic acid metal salt has a coloring property, yellowing property,
Although the fading property by light is good, it cannot be said that the resistance to water or a plasticizer is still sufficient.

(Problems to be Solved by the Invention) An object of the present invention is to provide a novel developer composition which is applied to a developer sheet for pressure-sensitive copying paper, which is improved in the above drawbacks and has excellent performance.

(Means for Solving Problems) The present inventors have completed the present invention as a result of intensive studies for achieving the above object.

That is, the present invention relates to a metallized product of a co-condensation resin containing salicylic acid and α, α′-dialkoxy-p-xylene as main monomer components, and a general formula I (In the formula, X is H, Cl and Br, and R ₁ and R ₂ are C _{1 to} C ₁₂ respectively.
Alkyl group, C _{1 to} C ₁₂ alkoxy group, C _{7 to} C ₁₅ aralkyl group or aryl group, which may be the same or different from each other). And a developer composition for pressure-sensitive copying paper.

The color-developing sheet using the novel color-developing composition of the present invention has a color developability equal to or higher than that of the color-developing sheet using the inorganic solid acid or p-phenylphenol novolac resin. In addition, the color image has a resistance that does not easily fade with water, a plasticizer, and light rays.

Further, the yellowing resistance due to sunlight irradiation is greatly improved, and it has an advantage that a color developing sheet which is extremely advantageous in handling and storage can be provided at low cost.

The salicylic acid co-condensation resin used in the present invention is a novel resin that has never been produced.

Α, α'which is an essential component of the co-condensation resin used in the present invention
-Dialkoxy-p-xylene gives a corresponding phenolic resin by reaction with a phenolic compound, and this resin is further reacted with a basic compound such as hexamethylenetetramine to cure it, a so-called thermosetting polymerization composition. It is used as (Japanese Patent Publication No. 47-15111).

However, in these thermosetting polymerization compositions, as a phenol compound, carboxylic acid, alkylphenols, phenylphenols, para-aminophenol, pyrogallol, phloroglicinol are used, and those reacted with salicylic acid are used. Is not known at all. This means that phenol compounds and α, α'-
When reacting dialkoxy-p-xylene under an acidic catalyst, alcohol is produced by dealcoholation reaction,
With a phenol compound having an organic carboxylic acid, that is, salicylic acid which is one component of the present invention, it is possible to give salicylic acid esters and a mixture of these resins by reaction with an alcohol formed under an acidic catalyst to obtain an intended product. Since it is easily expected to be difficult, it is considered that it has not been considered yet.

Surprisingly, however, the inventors have found that salicylic acid and α, α′-dialkoxy-p-xylene, or their main monomeric constituents, as well as mesitylene and / or
Alternatively, when p-substituted phenol is further reacted as a monomer component in the presence of an acid catalyst at a reaction temperature of 110 ° C. or higher, a side reaction such as a corresponding esterification reaction hardly occurs, and the salicylic acid phenol co-condensation resin is produced. It was found that it can be obtained.

The α, α′-dialkoxy-p-xylene as the main monomer component of the cocondensation resin used in the present invention is preferably α, α′-dimethoxy-p-xylene, α, α′-.
Diethoxy-p-xylene, α, α′-di-n-propoxy-p-xylene, α, α′-isopropoxy-p-
Xylene, α, α′-di-n-butoxy-p-xylene, α, α′-di-sec-butoxy-p-xylene,
Examples include α, α′-diisobutyl-p-xylene.

In these α, α'-dialkoxy-p-xylene, when the number of carbon atoms of the alkyl group is 5 or less, when the reaction is performed at a temperature of 110 ° C or higher, the reaction is fast and the esterification reaction does not occur, A good resin is easily obtained. Further, when the number of carbon atoms is 4, that is, in the butyl group, the reaction of the tert-butyl group tends to be slow.

The other main monomer component is salicylic acid.

The amount of these components used to obtain a co-condensed resin composed of these main monomer components is 0.1 to 1.0 mol of α, α'-dialkoxy-p-xylene per mol of salicylic acid.

In addition to the main monomer components described above, a cocondensation resin containing mesitylene and / or p-substituted phenol as a monomer component can also be used.

The p-substituted phenol used in such a co-condensation resin includes p-alkylphenols having 1 to 12 carbon atoms, p-cycloalkylphenols, p
-Aralkylphenols and p-phenylphenol. As p-alkylphenol, p
-Gresol, p-ethylphenol, p-isopropylphenol, p-sec-butylphenol, p-tert
-Butylphenol, p-tert-octylphenol,
Examples include p-nonylphenol and the like. Examples of p-cycloalkylphenol include p-cyclopentylphenol and p-cyclohexylphenol. p-
As aralkylphenol, p-benzylphenol, p-α-methylbenzylphenol, p-α, α-
Examples include dimethylbenzylphenol and the like.

These phenols may be used alone or in combination of two or more.

Such salicylic acid and α, α′-dialkoxy-
In addition to the main monomer component of p-xylene, when mesitylene and p-substituted phenol are used together to produce a cocondensation resin containing p-substituted phenol and / or mesitylene as a monomer component, the use of mesitylene The amount is 0.1 to 15 mol ratio, preferably 0.5 to 1 mol of salicylic acid.
The amount of p-substituted phenol used is 0.1 to 15 mol, preferably 0.5 to 1 mol of salicylic acid.
~ 10 molar ratio. In addition, α, α′-dialkoxy-p
The amount of xylene used is 0.1 to 1.0 mol ratio, preferably 0.3 to 0.8 mol ratio, relative to 1 mol of the combination of salicylic acid, mesitylene and p-substituted phenol.

When only mesitylene is used, the amount of mesitylene used is 0.1 to 20 mol ratio, preferably 0.5 to 10 mol ratio, relative to 1 mol of salicylic acid. The amount of α, α′-dialkoxy-p-xylene used is 0.1 to 1 mol based on the combination of salicylic acid and mesitylene binary.
The molar ratio is 1.0, preferably 0.3 to 0.8.

Furthermore, when only p-substituted phenol is used, p-
The amount of substituted phenol used is 1 mol of salicylic acid.
The molar ratio is 0.1 to 50, preferably 0.5 to 20. The amount of .alpha.,. Alpha .'- dialkoxy-p-xylene used is 0.1-1.0 mol ratio, preferably 0.3-0.8 mol ratio, per mol of salicylic acid and p-substituted phenol. .

The reaction temperature must be 110 ° C or higher, and
If it is lower than 10 ° C, the reaction becomes extremely slow, and the production of side reactions such as esterification reaction becomes large. Further, in order to shorten the reaction time as much as possible, a temperature range of about 130 to 240 ° C is desirable. The reaction time is 1 to 20 hours. Acid catalysts include inorganic or organic acids, especially mineral acids such as hydrochloric acid, phosphoric acid,
Sulfuric acid or formic acid, or Friedel-Crafts type catalysts such as zinc chloride, stannic chloride, ferric chloride, organic sulfonic acids such as methane sulfonic acid or p-toluene sulfonic acid alone, or You may use together. The amount of the catalyst used is salicylic acid, α, α′-dialkoxy-
About 0.01 to 5 of the total weight of p-xylene, and optionally mesitylene and / or p-substituted phenol.
It may be wt%.

As a general method for producing the resin used in the present invention,
Predetermined amount of salicylic acid and α, α′-dialkoxy-p
-Xylene, or in addition to these main monomer components, when mesitylene and / or p-substituted phenol is used as a monomer component, these are added, and a catalyst is also added at the same time and the temperature is raised as it is to react at a predetermined temperature. Let
The alcohol produced as the reaction proceeds is trapped outside the system. If necessary, a trace amount of alcohol remaining in the system is removed with nitrogen to the outside of the system.

After completion of the reaction, the contents are discharged, cooled and pulverized to obtain the desired product. Further, when unreacted salicylic acid remains in the resin, as a method for removing it, hot water washing of the resin or benzene, toluene, xylene, monochlorobenzene,
A method of dissolving in an organic solvent such as methyl isobutyl ketone or cyclohexanone and washing with hot water may be used.

Several known methods can be applied to produce the metallized product from the salicylic acid co-condensed resin thus produced.
For example, it can be produced by reacting the alkali metal salt of the present resin with a water-soluble polyvalent metal salt in water or a solvent in which both are soluble.

That is, an alkali metal hydroxide, carbonate, alkoxide, or the like of a resin is reacted with a resin to obtain an alkali metal salt of a resin or an aqueous solution, alcohol solution, or water-alcohol mixed solution thereof, and then a water-soluble polyalcohol. It is a method of producing a valent metal salt by reacting it. It is desirable to react about 0.5 to 1 gram equivalent of water-soluble polyvalent metal salt with respect to 1 mol of salicylic acid in the resin.

Alternatively, the resin can be produced by mixing the resin with a polyvalent metal salt of an organic carboxylic acid such as formic acid, acetic acid, propionic acid, valeric acid, caproic acid, stearic acid or benzoic acid and heating and melting. In some cases, a basic substance such as ammonium carbonate, ammonium bicarbonate, ammonium acetate or ammonium benzoate may be further added and the mixture may be melted by heating. Furthermore, using resins, polyvalent metal carbonates, oxides, and hydroxides, ammonium formate, ammonium acetate,
Ammonium caproate, ammonium stearate,
It can be produced by heating and melting with a basic substance such as ammonium organic carboxylate such as ammonium benzoate.

When producing a metallized resin by heating and melting, the melting temperature is usually 100-180 ℃, the reaction time is the resin composition,
Depending on the melting temperature, the type of polyvalent metal salt, and the amount used, it is about 1 to several hours. Regarding the amount of polyvalent metal salt used,
It is desirable to use organic carboxylates, carbonates, oxides, and hydroxides of polyvalent metals such that the metal is present at 1% to about 20% by weight, based on the total weight of the resin.

The amount of the basic substance used is not particularly limited, but is usually 1 to 15% by weight based on the total weight of the resin. When using a basic substance, it is more preferable to mix it with a polyvalent metal salt in advance.

The metal of the metallized salicylic acid co-condensed resin used in the present invention is a metal excluding alkali metals such as lithium, sodium and potassium. Preferred polyvalent metals are magnesium, aluminum, calcium, copper, zinc and tin. , Barium, cobalt, nickel and the like. Of these, zinc is particularly effective.

The developer composition of the present invention contains a metallized product of the co-condensed resin obtained as described above and a benzotriazole compound represented by the above general formula I.

Specific examples of the benzotriazole compound used in the present invention include 2- (2'-hydroxy-5'-methylphenyl) benzotriazole and 2- (2'-hydroxy-).
3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-t-
Butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-
t-amylphenyl) benzotriazole, 2- (2 '
-Hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-5'-t
-Octylphenyl) benzotriazole, 2- (2 '
-Hydroxy-3 ', 5'-di-α, α-dimethylbenzylphenyl) benzotriazole, 2- (2'-hydroxy-4'-n-octoxyphenyl) benzotriazole, 2- (2'-hydroxy- 4'-ethoxyphenyl) benzotriazole and the like. In addition, any benzotriazole compound represented by the general formula I can be used.

Salicylic acid and α, α'-dialkoxy- of the present invention
In order to produce a metallization product of a co-condensation resin containing p-xylene as a main monomer component (hereinafter referred to as a component), and a developer composition containing a benzotriazole compound (hereinafter referred to as a component), various methods are available. The method of is mentioned.

That is, (1) a method of heating and melting components and components, (2) a method of dissolving components and components in a common solvent and then removing the solvent, and (3) compatibilizing components and components. Examples thereof include a method of heating and melting with three substances, and a method of (4) mixing with powder.

In the developer composition of the present invention, the mixing ratio of the components is 0.1 to 20 parts by weight, preferably 0.3 to 10 parts by weight, based on 100 parts by weight of the components.

When producing a developer sheet using the developer composition of the present invention, a known developer together with the developer composition of the present invention,
For example, it is acceptable to use an inorganic solid acid such as activated clay, an organic polymer in a phenol-formaldehyde resin, or a metal salt of an aromatic carboxylic acid together. Furthermore, zinc, magnesium, aluminum, lead, titanium, calcium,
You may use together with at least 1 sort (s) of oxides, hydroxides, or carbonates of the polyvalent metal selected from the group which consists of cobalt, nickel, manganese, and barium.

As a method for preparing a color developing sheet using the color developing composition for pressure-sensitive copying paper of the present invention, (1) an aqueous paint using an aqueous suspension of the color developing composition is used as a support such as paper. How to apply to
Any of (2) a method of filtering the developer composition at the time of papermaking, and (3) a method of coating the support with a solution or suspension of the developer composition can be used.

When preparing a paint, kaolin clay, calcium carbonate, starch, synthetic and natural latex, etc. are distributed to obtain a paint having suitable clay and coating suitability. The proportion of the developer component in the paint is preferably 5 to 70% of the total solid content, and if the proportion of the developer component is less than 5%, sufficient color developability cannot be exhibited, and if it exceeds 70%. The paper surface characteristics of the color developing sheet deteriorate. The coating amount of the coating dry weight 0.5 g / m ² or more, preferably 1 to 10 g / m ^2.

The developer composition for pressure-sensitive copying paper of the present invention requires a small amount of the developer component and the coating material, and can change the concentration, viscosity, etc. of the coating material in a relatively wide range. Both off-machine coating is possible, which brings about great advantages not only in performance but also in the pressure-sensitive paper manufacturing process.

(Action and Effect) The present invention is directed to salicylic acid and α, α′-dialkoxy-
Pressure-sensitive duplication in which a benzotriazole compound is added to a metallization of a novel co-condensation resin containing p-xylene as a main monomer component, or mesitylene and / or p-substituted phenol as a monomer component. A developer composition for paper is provided.

The pressure-sensitive copying paper color developing sheet using the pressure-sensitive copying paper color developer composition of the present invention has no yellowing due to light and gases such as nitrogen oxides in the air, and is excellent in stability of color forming ability over time. , The color image is stable with respect to light and plasticizers, does not cause a decrease in color density, and the light stability of the color image is significantly improved, and long-term storage stability is required. It has become possible to expand the use of pressure-sensitive copy paper for existing applications,
Its practical significance is extremely large.

(Examples) Hereinafter, the present invention will be described with reference to Examples.

Example 1 13.8 g (0.1 mol) of salicylic acid and 36.1 mesitylene were placed in a reactor.
g (0.3 mol), α, α'-dimethoxy-p-xylene 3
3.2 g (0.2 mol) was charged, and 0.2 g of p-toluenesulfonic acid and 0.2 g of anhydrous zinc chloride were added to the catalyst. Then, the mixture was heated with stirring and reacted at a temperature of 150 to 160 ° C. for 4 hours, whereby 13.3 g of methanol was distilled. After the reaction was completed, 200 ml of toluene was added to dissolve the reaction product.
400 ml of warm water was added thereto, and the mixture was stirred under reflux for 30 minutes, and then the lower aqueous layer was separated and removed. The operation of extracting and separating the unreacted monomer with warm water was repeated twice more, and then the solvent toluene was distilled off under reduced pressure. Then, the molten resin was discharged to obtain a light brown transparent resin.

10 g of the obtained co-condensation resin was charged into a flask and heated to 1
The mixture was melted at a temperature of 50 to 160 ° C., and then a mixture of 3.2 g of zinc benzoate and 2.0 g of ammonium bicarbonate was added gradually with stirring over 30 minutes. Then, the reaction was terminated by stirring at 160 to 170 ° C. for 1 hour. After the reaction was completed, the molten resin was discharged, cooled, and then pulverized to obtain 12.5 g of a zinc compound powder. The softening point of the obtained zinc compound is 1
It was 04 ° C.

10 parts by weight of this zinc compound, 2- (2'-hydroxy-
3 ′, 5′-t-butylphenyl) -5-chlorobenzotriazole (0.3 parts by weight) was mixed and heated to 180 ° C. and melted,
A light yellowish brown transparent developer composition (A) was obtained.

Example 2 13.8 g (0.1 mol) of salicylic acid and 24 g of mesitylene in a reactor.
(0.2 mol), p-tert-octylphenol 20.6 g (0.
1 mol) α, α′-dimethoxy-p-xylene 33.2 g (0.
2 mol) and p-toluenesulfonic acid 0.3 g on the catalyst
Was added. Then, heat with stirring to a temperature of 150-160.
When the reaction was carried out at 4 ° C for 4 hours, 11.2 g of methanol was distilled off. After completion of the reaction, 200 ml of toluene was added to dissolve the reaction composition. 400 ml of warm water was added to this, and it was refluxed for 30
After stirring for a minute, the lower aqueous layer was separated and removed. The operation of extracting and separating the unreacted monomer with warm water was repeated twice more, and then the solvent toluene was distilled off under reduced pressure. Then, the molten resin was discharged to obtain a light brown transparent resin.

10 g of the obtained salicylic acid-mesitylene-p-tert-octylphenol co-condensation resin was charged into a flask and heated to melt at a temperature of 150 to 160 ° C. Then, a mixture of 1.4 g of zinc benzoate and 0.85 g of ammonium bicarbonate in advance was gradually added to the molten resin with stirring over 30 minutes. Then, the reaction was terminated by stirring at a temperature of 155-165 ° C for 1 hour. After the reaction was completed, the molten resin was discharged, cooled, and then pulverized to obtain 10.5 g of a zinc compound powder. The softening point of this zinc oxide was 94 ° C.

2- (2'-hydroxy-5 ') was added to 10 parts by weight of this zinc compound.
-Methylphenyl) benzotriazole (0.5 parts by weight) was mixed, and the mixture was heated to 180 ° C and melted to obtain a light yellow transparent developer composition (B).

Example 3 A reactor was charged with 13.8 g (0.1 mol) of salicylic acid, 61.8 g (0.3 mol) of p-tert-octylphenol and 33.2 g (0.2 mol) of α, α′-dimethoxy-p-xylene, and the catalyst was charged with p. -0.5 g of toluenesulfonic acid was added. Then, the mixture was heated and stirred when it was dissolved. Reaction temperature 150-160
When the reaction was carried out at 4 ° C for 4 hours, 12.2 g of methanol was distilled off. After completion of the reaction, 200 ml of toluene was added to dissolve the reaction composition. 400 ml of warm water was added to this, and it was refluxed for 30
After stirring for a minute, the lower aqueous layer was separated and removed. The operation of extracting and separating the unreacted monomer with warm water was repeated twice more, and then the solvent toluene was distilled off under reduced pressure. Then, the molten resin was discharged to obtain a light brown transparent resin. Obtained salicylic acid-p-tert-octylphenol co-condensation resin
10 g was charged into a flask and heated to melt at a temperature of 150-160 ° C. Then, a mixture of 4.9 g of zinc benzoate and 3.0 g of ammonium bicarbonate was mixed into the molten resin with stirring.
The reaction was terminated by gradually adding over 30 minutes and then stirring at a temperature of 155-165 ° C for 1 hour. After the reaction was completed, the molten resin was discharged, cooled, and then pulverized to obtain 12.5 g of a zinc compound powder. The softening point of this zinc compound was 106 ° C.

2- (2'-hydroxy-
0.2 parts by weight of 3 ', 5'-di-α, α-dimethylbenzylphenyl) benzotriazole were mixed and heat-melted to 180 ° C. to obtain a light yellow transparent developer composition (C).

Test Example The developer compositions obtained in Examples 1 to 3 were wet-pulverized in the presence of a small amount of a polymeric anionic surfactant to obtain an aqueous suspension having a solid content of 40% (average particle size). Diameter 2.5μ).

Next, using this suspension, an aqueous coating solution (solid content
30% by weight) was prepared.

Weight ratio of solid content Soft calcium carbonate 100 Developer composition 15 Starch binder 8 Synthetic rubber latex 8 This aqueous coating solution is applied to a fine paper of 40 g / m ² using a Mayer bar coater at a dry coating amount of 6 g / m ² And dried to prepare a color-developing sheet.

On the other hand, a color developing sheet was similarly prepared by using a color developing agent to which the benzotriazole compound was not added.

Performance tests were conducted using these color developing sheets.

The performance measurement method was as follows.

(1). Color development speed and concentration (Implemented in a constant temperature and humidity room at 20 ° C and 65% RH) Commercially available blue coloring top paper (JW NW-40T) that uses crystal violet lactone (CVL) as the main pressure-sensitive dye.
Using, the two surfaces of the color developing sheet (lower paper) obtained in the example are made to face each other and overlapped, and the color is stamped and developed by an electronic typewriter.

The reflectance is measured 30 seconds and 24 hours after stamping with a TSS Hunter colorimeter (using an amber filter) and displayed as Y value.

(2). Lightfastness of Colored Image Lightfastness The color developing sheet developed by the method of (1) was irradiated with a carbon arc fade meter (FAL-5 type manufactured by Suga Test Instruments) for 4 hours, and the colored image after the test was compared with a Hunter colorimetric image. The color was measured with a meter (using an amba filter) and displayed. The smaller the difference between before and after the test, the less the fading of the color image due to the light is, which is preferable.

(3). Yellowing due to light The color-developing sheets obtained in the examples and comparative examples were put on a carbon arc fade meter (FAL-5 type manufactured by Suga Test Instruments Co., Ltd.) to
After the time-irradiation treatment, the whiteness after the test was measured and displayed with a Hunter colorimeter (using a blue filter). The smaller the difference between before and after the test, the less the light yellowing of the paper surface is, which is preferable.

(4) Degree of light-induced attenuation of color development performance In (3), using a color-developing sheet that was light-treated for 4 hours with a fade meter, combined with commercially available blue color development top paper, the degree of color development remaining with a typewriter I checked.

○ Sufficient color development ability is maintained △ Color development degree is reduced × Loss of color development ability is shown in Table-1.

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Claims (4)

[Claims] 1. A metallized product of a co-condensation resin comprising salicylic acid and α, α′-dialkoxy-p-xylene as main monomer components, and a general formula I. (In the formula, X is H, Cl and Br, and R ₁ and R ₂ are C _{1 to} C ₁₂ respectively.
Alkyl group, C _{1 to} C ₁₂ alkoxy group, C _{7 to} C ₁₅ aralkyl group or aryl group, which may be the same or different from each other). Developer composition for pressure-sensitive copying paper 2. A cocondensation resin comprising salicylic acid and α, α′-
The color developer composition for pressure-sensitive copying paper according to claim 1, which is a co-condensation resin containing p-substituted phenol as a monomer component in addition to the main monomer component of dialkoxy-p-xylene. 3. The cocondensation resin is salicylic acid and α, α′-.
The developer composition for pressure-sensitive copying paper according to claim 1, which is a co-condensation resin containing mesitylene as a monomer component in addition to the main monomer component of dialkoxy-p-xylene. 4. The co-condensation resin is salicylic acid and α, α′-.
The color developer composition for pressure-sensitive copying paper according to claim 1, which is a co-condensation resin containing p-substituted phenol and mesitylene as monomer components in addition to the main monomer component of dialkoxy-p-xylene. object