JPH01315477A - Desensitized ink - Google Patents

Abstract

PURPOSE:To obtain a desensitized ink for a pressure-sensitive duplicating paper, excellent in printability, setoff properties and desensitizing effect and free from multiple images by water by adding an alkylene oxide containing butylene oxide in a specified ratio to a specified amine. CONSTITUTION:An objective ink prepared, by adding (B) 4-70mol% alkylene oxide containing >=40mol% butylene oxide to (A) 1mol amine of formula NH2-C3 H6-(OC3H6)n-NH2 (n is 1-70) or the formula (x, y and z are 1-20).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a desensitizing ink for pressure-sensitive copying paper, which is particularly free from double images caused by 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-sensitive 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 Nos. 2505470, 2505489, 2550471, 2548366, 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 also 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 (01S) 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 disclosed in, for example, U.S. Pat.
No. 5, No. 45-21448, No. 46-2265'1, No. 46-29546, JP-A No. 47-32915,
JP 47-38201, JP 48-4050, JP 48-6805, JP 49-4484, JP 49
-'19647, 49-23008, 49-2
No. 3850, JP-A-49-43708, JP-A No. 49-72
No. 009, No. 49-77709, No. 49-77710
No. 49 15513@, 49-83509 Tan, German patent application (OLS) No. 2343800, 2359
No. 079, No. 2361856, Special Publication No. 58-3811
No. 9, JP-A-63-41184, JP-A-63-746
It is detailed in No. 81 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, reactivation by water 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 4 to 70
This desensitizing ink for pressure-sensitive copying paper is characterized in that it contains an adduct to which mol of alkylene oxide is added, and 40 mol % or more of the alkylene oxide is butylene oxide.

Nil□-C3118+ 0-C3HQT'F NHz
(I) However, n is an integer from 1 to 70, χ,
ylz represents an integer from 1 to 20.

At least 40% of the alkylene oxide must be butylene oxide, but for the remaining 60% or less, ethylene oxide, propylene oxide, butylene oxide, styrene oxide, etc. can be used, but propylene oxide and butylene oxide are preferable. be.

The amine represented by formula (I) or (II) above is easy to handle, and its molecular weight as an amine can be freely controlled. Furthermore, it has the advantage that it is easy to control the amine and alkylene oxide adducts, which have low viscosity, have a relatively high molecular weight, and dissolve resin well.

Taking advantage of the above characteristics of the present desensitizer, it is possible to create a desensitizing ink for letterpress, offset, or flexography by combining it with a known desensitizer.

As the pigment used in the present invention, white pigments such as titanium dioxide, barium sulfate, calcium carbonate, tar, kaolin, and bentonite 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 ethyl 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. .

(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 Maeyo Kagaku Co., Ltd.) was added and dissolved at 7 J [L, 150°C. After cooling this melt to 25° C., 25 parts by weight of titanium dioxide and 18 parts by weight of white spindle oil were added and kneaded in a three-roller mill to obtain 1 q of desensitized ink for offset and letterpress.

As the test paper, a commercially available pressure-sensitive copy paper (Fuji Pressure-Sensitive Paper, manufactured by Fuji Photo Film (11)) was used.

The ink was evaluated by printing the above desensitizing ink at 3 g/rd, applying a weight of 100 g/Ci, combining it with the lower paper for -weeks, and evaluating the transfer to the lower paper as a set-off. In addition, the printed surface and top paper (commercially available Fuji pressure-sensitive paper) are overlapped, and the entire surface is colored using a super calendar.
The desensitizing effect and the uniformity of the desensitizing effect were evaluated and shown in Table 2.

(The following is a margin) Table 2 ○: Excellent Δ: Slightly inferior X: Inferior (Effects of the invention) The desensitizing ink according to the present invention is excellent in printability, set-off property, and desensitizing effect.

Claims (1)

[Scope of Claims] An adduct in which 4 to 70 mol of alkylene oxide is added to 1 mol of amine represented by general formula [I] or [II], wherein 40 to 70 mol of alkylene oxide is added to
A desensitizing ink for pressure-sensitive copying paper, characterized in that it contains an adduct whose mole % or more is butylene oxide. ▲There are mathematical formulas, chemical formulas, tables, etc.▼[I] ▲There are mathematical formulas, chemical formulas, tables, etc.▼[II] However, n is an integer from 1 to 70, and x, y, and z are integers from 1 to 20. .