JPH01285379A - Desensitizing ink for pressure-sensitive copy paper - Google Patents

Abstract

PURPOSE:To obtain a desensitizing ink for a pressure-sensitive copy paper free from ghost image by water, superior in various printabilities, and improved in desensitizing effect and setoff properties, by incorporating an addition compound obtained by adding a specific amount of a butylene oxide to trimethyl hexamethylenediamine. CONSTITUTION:In a desensitizing ink containing a desensitizer, a pigment, and a binder, as the desensitizer an addition compound obtained by adding 4-70mol alkylene oxide to 1mol trimethyl hexamethylenediamine is incorporated, but 40mol% or more of the alkylene oxide is a butylene oxide. As the pigment, a white pigment, such as titanium dioxide, barium sulfate, calcium carbonate, talc, kaolin, and bentonite, is used. As the binder, a natural or synthetic high-molecular compound, such as rosin modified phenol resin, ketone resin, polyamide resin, polyvinyl alcohol, gelatin, and shellac, is used.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a desensitizing ink for pressure-sensitive copying paper, in particular, a desensitizing ink for pressure-sensitive copying paper, which is free from edge recovery due to water, has excellent suitability for various types of printing, and has improved desensitizing effects and set-off properties. This invention relates to desensitizing ink for pressure copying paper.

(Prior art) Electron-donating or proton-accepting colorless organic compounds (
It has been known for a long time that a colored image is obtained by the reaction between a color former (hereinafter referred to as a color former) and an electron-accepting or proton-releasing agent (hereinafter referred to as a color developer).

Pressure-sensitive copying paper (
For example, US Patent No. 2505470@, US Patent No. 2505489@
, No. 2550471, No. 2548366, No. 271
No. 2507, No. 2730456, No. 2730457, No. 3418250, No. 3672935), thermal recording paper (for example, Japanese Patent Publication No. 43-4160, No. 43-760)
No. 0, No. 45-14039, U.S. Patent No. 2939009
(No.) etc. Furthermore, a printing method is known in which a colored image is obtained by supplying ink containing a color former to a sheet coated with a color developer (German patent application (OLS) 1939962).
issue).

The color developer has the properties defined above and includes clays, phenolic resins, metal salts of aromatic carboxylic acids, and the like.

Generally, in pressure-sensitive copying paper, a combination of a layer containing microcapsules containing a coloring agent and a color developer layer is used to obtain a colored image, and these layers are brought into contact with each other to obtain a colored image. This is done by destroying the microcapsules and bringing the color forming agent and color developer into contact.

Generally, these color developers are used as a color developer sheet that is uniformly applied to the entire surface of the support, but depending on the purpose of use of the pressure-sensitive copying paper, there may be areas on the side of the color developer sheet that do not require recording. In such cases, a method of desensitizing the color developer sheet by applying a desensitizing ink containing a desensitizing agent to that portion of the color developer sheet using a printing machine or the like is used.

Desensitizing inks used for such purposes are described in, for example, U.S. Pat.
No. 55, No. 45-21448, No. 46-22651, No. 46-29546, JP-A-47-32915,
JP 47-38201, JP 4B-4050, JP 48-6805, JP 49-4484, JP 49
-19647, 49-23008, 49-23
No. 850, JP-A-49-43708, JP-A No. 49-720
No. 09, No. 49-77709, No. 49-77710, No. 49-15513, No. 49-83509, German patent application (OLS) No. 2343800, No. 23590
No. 759, No. 2361856, Special Publication No. 58-3811
No. 9, JP-A-63-74681, JP-A-63-411
It is detailed in No. 84 etc.

(Problem to be Solved by the Invention) Desensitizing inks used for the above purpose generally use a desensitizer, a pigment such as titanium dioxide, a binder, and if necessary a diluent such as an organic solvent. No ink has been found that has an excellent desensitizing effect against various color developers and has good set-off properties. Also, if a desensitizer that is highly soluble in water is used, water-induced recovery may occur, while if a desensitizer that is insoluble in water is used, the printed area will not be uniform when used for offset printing, which are contradictory characteristics. It had turned into ink.

Therefore, an object of the present invention is to provide a desensitizing ink for pressure-sensitive copying paper that has excellent printability, has an excellent desensitizing effect on various color developers, has good set-off properties, and is free from recovery due to water. There is a particular thing.

(Means for solving problems) The above objects are achieved by the invention described below.

That is, the present invention provides a desensitizing ink containing a desensitizer, a pigment, and a binder, in which an alkylene oxide adduct is used in an amount of 4 to 70 moles per mole of trimedelhexamethylene diamine as a desensitizer; A desensitizing ink for pressure-sensitive copying paper, characterized in that 40 mol% or more of alkylene oxide contains an adduct of butylene oxide.

As alkylene oxide, 40 mol% or more must be butylene oxide, and the remaining 60 mol%
Ethylene oxide, propylene oxide, butylene oxide, styrene oxide, etc. can be used below, but propylene oxide and butylene oxide are preferred.

This desensitizer has characteristics such as low viscosity, which is thought to be due to the branching of the alkyl group, and good stability with resins, and it can be used alone as well. It can be used in combination with conventionally known desensitizers.

As the pigment used in the present invention, white pigments such as titanium dioxide, barium sulfate, calcium carbonate, talc, kaolin, and pennite are used.

The binders used in the present invention include rosin-modified phenolic resin, ketone resin, polyamide resin, maleic acid resin,
Natural or synthetic polymeric compounds such as phenolic resins, epoxy resins, alkyd resins, melamine resins, urea resins, nitrocellulose, ethylcellulose, butyral resins, polyvinyl alcohol, gelatin, and shellac are used.

The desensitizing ink of the present invention can be used with the above composition alone, but if necessary, an organic solvent may be used as a diluent. Examples of the organic solvent include linseed oil, tung oil, soybean oil, cottonseed oil, methanol, ethanol, ethyl acetate, toluene, hexane, methyl edyl ketone, methyl isobutyl ketone, polypropylene glycol, polybutylene glycol, and paraffin oil.

The desensitizing ink of the present invention may also contain waxes such as paraffin wax, microcrystalline wax, and carbanal wax, starch, anti-set-off agents such as dextrin, ultraviolet absorbers, antioxidants, etc., as necessary. .

Various types of trimethylhexamethylene diamine used in the present invention are known, but the most common ones are:
2,2,4-trimethylhexamethylenediamine and 2
, 4.4-trimethylhexamethylenediamine,
Moreover, these mixtures are more preferable in terms of properties (viscosity, solubility).

(Example) To 40 parts by weight of the desensitizer shown in Table 1, 17 parts by weight of a rosin-modified phenol resin (Tamanol T135, manufactured by Partyo Kagaku Co., Ltd.) was added and dissolved at 150°C. 25% of this lysate
After cooling to .degree. C., 25 parts by weight of titanium dioxide and 18 parts by weight of white spindle oil were added and kneaded in a Miki roller mill to obtain desensitized inks for offset and letterpress.

As the test paper, a commercially available pressure-sensitive copy paper (manufactured by Fuji Pressure-Sensitive Paper-Fuji Photo Film (■)) was used.

Ink evaluation was carried out by printing the above desensitizing ink at 3 g/m.
After applying a 100 g/cm cart and combining it with the lower paper for -1 week, the transfer to the lower paper was evaluated as set-off, and the printed surface and the lower paper (commercially available Fuji pressure-sensitive paper) were overlapped. , the entire surface is colored using a super calendar.
The desensitizing effect and the uniformity of the desensitizing effect were evaluated.

Table 1 Examples 1 and 2 used a mixture of 2,2,4-trimedelhexamethylene diamine and 2,4,4-trimethylhexamethylene diamine (commercially available as TMD) as the raw material.

Effect O: Excellent X: Inferior Δ: Slightly Inferior (Effects of the Invention) The desensitizing ink according to the present invention is excellent in printability, set-off property, and desensitizing effect.

Procedural official document (spontaneous) 1. Indication of the case 1988 Patent Application No. 115725 2. Name of the invention Desensitizing ink for pressure-sensitive copying paper 3. Contact information for the person making the amendment 125 Togane-cho, Katsushika-ku, Tokyo -Chome 4, January Mitsubishi Paper Mills Co., Ltd. Tokudo 1, Part 4 (600) 2481 4, "Detailed Description of the Invention" column of the specification to be amended (1) Page 3 of the specification, line 111 r27777805 "No." is corrected to "No. 2777780."

(2) Same page 4, line 2, r23590759 month”, Corrected to "No. 2359079".

Claims (1)

[Claims] For 1 mole of trimethylhexamethylene diamine, 4
1. A desensitizing ink for pressure-sensitive copying paper, characterized in that it contains an alkylene oxide adduct of up to 70 mol, in which 40 mol % or more of the alkylene oxide is butylene oxide.