JPH03293189A - Method for printing on color developer sheet - Google Patents

Abstract

PURPOSE:To apply printing of good quality on a large number of developer sheets by preventing the diffusion and transfer of desensitizing ink to a color forming part by using a humidifying solution containing at least one of acetylene glycol and acetylene alcohol when the developer sheet is printed with desensitizing ink. CONSTITUTION:Acetylene glycol is a compound wherein two carbon atoms adjacent to the triple bond of alkylene respectively have one hydroxyl group and represented by formula I (wherein R1 is pref. a methyl group and R2 is pref. a 4C or less alkyl group). As especially pref. acetylene glycol, there is one wherein the number of moles of added ethylene oxide is 10 or more. Acetylene alcohol is unsaturated alcohol having an acetylene bond in its molecule and represented by formulae 5, 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an offset printing method, and particularly to a method of printing on a color developer sheet.

(Prior Art) Carbonless pressure-sensitive copying paper, also called carbonless paper, has been in practical use for a long time.

This normally consists basically of an upper paper coated with microcapsules containing a solution of an electron-donating colorless dye, and a lower paper coated with an electron-accepting color developer. The colorless dye in the capsule is released and encounters the color developer on the bottom paper, developing color and producing a visible copy image.Furthermore, an inner paper (a paper-like support By inserting a microcapsule containing a colorless dye solution on one side of the support and a color developer coated on the other side between the two, a large number of copies can be obtained. By laminating a layer of microcapsules containing a colorless dye solution and a layer of a color developer on one side, a pressure-sensitive color image can be obtained even on a single sheet of paper, and it is used as a self-contained paper (laminated state A self-contained paper with a single-layer coating that has both layers mixed together has also been announced).

In this way, in carbonless pressure-sensitive copying paper, the layer consisting of microcapsules containing a colorless dye solution and the layer consisting of a color developer, that is, the color developer layer, is a basic element, and many proposals have been made in the past. I came.

Famous colorless dyes include triphenylmethane-type lactone dyes represented by crystal violet lactone and xanthine phthalide-type lactone dyes represented by 3-diethylamino-6-methyl-7-anilinofluorane. Examples include activated clays represented by acid clay and activated clay, novolac-type polycondensation resins of substituted phenols represented by para-octylphenol or para-phenylphenol, and aldehydes such as formaldehyde, or 3,5-di Aromatic carboxylic acid metal salts typified by -α-methylbenzylsalicylic acid zinc salt are well-known as those on a practical level.

Desensitizing ink is applied to the color developer coated layer as described above, that is, to areas where color development is not required in the color developer layer (normal front side of bottom paper and inner paper, coated side of aluminum or self-contained paper). It has been used for the purpose of making it impossible to develop color.

In order to actually apply desensitized ink to the developing surface, it is necessary to improve the accuracy of repeated work (improve registration), improve the surface quality of the application surface,
Various printing methods (flexo/gravure printing, letterpress printing, offset printing, silk screen printing, etc.) are often used for the purpose of improving coating amount accuracy, diversifying form designs, and improving work efficiency. Desensitizers, other auxiliary materials, additives, etc. are blended into inks that are compatible with these printing methods, and the inks are put into practical use in the form of compositions.

(A composition formulated for printing in this way is called a desensitizing ink.) For this reason, in addition to the ability to prevent color development and erasing, that is, desensitizing ability, the desensitizing agent has various properties. It is important to note that desensitized inks with printability depending on the printing method can be prepared.

Regarding g-sensitizers, US Patent No. 2777780, Japanese Patent Publication No. 4
No. 4-27255, No. 45-21448, No. 46-2
No. 2651, No. 46-29546, JP-A-47-32
No. 915, Special Publication No. 47-38201, No. 48-405
No. 0, Japanese Patent Publication No. 48-6805, Special Publication No. 49-4484
No. 49-19647, No. 49-23008, No. 49-23850, JP-A No. 49-43708, No. 4
No. 9-72009, No. 49-77709, No. 49-7
No. 7710, No. 49-15513, No. 49-8350
9, German Patent Application (OLS) No. 2343800, OLS No. 2359079, and No. 2361856, for example, the following specific examples can be given. Quaternary ammonium salts such as dodecyltrimethylammonium chloride and octadecyl ammonium chloride;
High molecular weight amines such as dodecylamine; 2.4.
4-) Substituted oxazolines such as limethyl 2-oxazoline: Reaction products of alkylene oxides and diamines or polyamine derivatives having a cyclic structure in the molecule such as xylene diamine and N-aminopropylpiperidine; polyoxyethylene alkylamines and polyoxy Ethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyethylene glycol, polypropylene glycol, polyoxypropylene alkylamine, glutamic acid-γ-alkyl ester residue + polymer, spiroacecool diamine, N-(aminoalkyl)- Examples include glycidyl ether adducts of lactams and amines.

(Problems to be Solved by the Invention) However, when printing with desensitizing ink on a color developer sheet such as carbonless pressure-sensitive copying paper, generally the desensitizing agent has hydrophilicity, so There is a problem in that the dampening liquid is taken into the desensitized ink area of the printing plate, and the desensitized ink gradually diffuses and migrates to areas where color development is required, resulting in a decrease in color development performance in that area or disappearance. Furthermore, if the supply of the dampening liquid is reduced, the desensitized ink will adhere to the entire area where coloring is required.

Therefore, an object of the present invention is to prevent the desensitizing ink from spreading to areas where color development is required, which occurs when printing with desensitizing ink on a color developer sheet, and to produce a large number of high-quality printed materials (color developer sheet). The objective is to provide a printing method that allows all possible printing methods.

(Means for Solving the Problems) The above object of the present invention is to use a dampening liquid containing at least one of acetylene glycol and acetylene alcohol when printing with desensitized ink on a color developer sheet. This was achieved using a unique printing method.

Acetylene glycol has an acetylene bond (
It is a compound having a carbon-carbon triple bond) and an alcohol (ROH: R is an alkyl group), and in particular, acetylene glycol as referred to in this specification is a compound having two carbon atoms adjacent to the alkyne triple bond. It is a compound characterized by having a hydroxyl group, and has, for example, the following formula (1).

As a specific example of formula (1), and (3).

For example, a particularly preferable example of the acetylene glycol represented by the following formula (2) is the formula (4).
) is added with ethylene oxide as shown in

(n+m=N represents the number of moles of ethylene oxide added, preferably 10 or more.) Also, in formula (4), acetylene glycol to which propylene oxide or a copolymer of propylene oxide and ethylene oxide is added instead of ethylene oxide It may be.

Acetylene glycol used in the present invention is manufactured by Air Products &
It is sold under the product name "ynol)".

The compound represented by the above formula (2) is surfinol 82
, the compound represented by formula (3) is surfinol 104
A, 104E, 104H (104A is 50% by weight of 2-ethylhexyl alcohol, 104E and 104H are 50 and 75% by weight of ethylene glycol), formula (
The compound represented by 4) is Surfynol 440,465
,485 (440 is N is 3.5.465 is 10.48
5 is 30. ) is the product name.

In addition, Surf Inol 104 and polyoxyethylene
Examples include Surfynol TG, which is an alkyl phenyl ether dissolved in ethylene glycol at a high concentration.

Acetylene alcohol is an unsaturated alcohol having an acetylene bond in its molecule, and specific examples thereof are represented by the following formulas (51, (61, and (7)).

(5) CH30CH20H (6) cn=C CH2-CH20H The compound represented by formula (7) can be obtained under the trade name Surfynol 61.

Acetylene glycol or acetylene alcohol is
Approximately 0.12 to approximately 502 liters per moisturizing liquid (as a working liquid)
The range can be used as a guideline.

The dampening liquid used in the present invention can contain conventionally known substances to modify the treatment activity. For example, gum arabic, carboxymethyl cellulose, sodium alginate polyvinylpyrrolidone, polyvinylimidazole, polyvinyl methyl ether and maleic anhydride copolymer, carboxymethyl starch, ammonium alginate, cellulose alginate methyl cellulose, sulfates (sodium sulfate, ammonium sulfate, etc.), Phosphoric acid, nitric acid, zinc acid, tannic acid and their salts, polyol compounds having two or more hydroxyl groups (polyethylene glycol, ethylene glycol, propylene glycol, glycerol, diethylene glycol, hexylene glycol, etc., organic weak acids (citric acid, succinic acid, tartaric acid, adipic acid, ascorbic acid, propionic acid, etc.), polyacrylic acid, ammonium dichromate, chromium alum, alginate fluoropylene glycol ester, aminopolycarboxylic acid salt (ethylene diamine tetra 1 or 2 of sodium acetate salt, etc.)
More than one seed can be added.

Examples of the present invention are shown below.

(Example) Example 1 A desensitizing ink was prepared using the following formulation.

First, a binder resin and wax were dissolved in a desensitizer, and then a white pigment was added and an ink was formed using a three-line roll.

Using this desensitizing ink, a commercially available carbonless pressure-sensitive copying paper medium (N-4
Offset printing was performed on the developing surface of the color developing layer (containing rose phenylphenol formalin resin).

The printing plate used was a PS plate SG-]I' manufactured by Fuji Photo Film Co., Ltd., and was tested by printing for 10 minutes at a speed of 1 OOm /mtn. The following was used as a humidifying liquid.

When dampening liquid [A] and [133k were used, the desensitizing ink spread to the areas where color development was required on the developing surface, and a desensitizing effect was observed in that area, whereas when dampening liquid [C1] and [D]
When 'e was used, no spread of the desensitized ink was observed. Further, when similar tests were conducted with the dampening liquids [A] and [B] reduced in supply amount, the spread of the desensitized ink was reduced, but a thin layer of the desensitized ink adhered to the entire area where color development was required.

Example 2 (a) 25 parts of titanium dioxide powder as pigment, but) rosin-modified phenol resin (Tokushima essential oil, K
, manufactured by Tespol 5PFL 160 ) 20 parts and (
C) A desensitizer consisting of 50 parts of 4 moles of ethylene oxide, 10 moles of propylene oxide, and 10 moles of 1,2-butylene oxide added in this order to 1 mole of 3-(2-ethylhexyloxy)propylamine. A sensitive ink was prepared. First, ([3) was t-dissolved in (C), and then (5) was added thereto and formed into an ink using a three-line forming roll.

This desensitizing ink was tested according to the method of Example 1.

No spread of desensitizing ink was observed in the dampening liquids [CD and CD+], but the same was observed in the dampening liquids [A] and CB) as in Example 1.

(Effects of the Invention) The printing method of the present invention is excellent in that it can prevent the desensitized ink from diffusing and migrating to areas where color development is required, and can perform high-quality printing on a large number of developer sheets. Effects can be obtained.

Claims (1)

[Claims] (1) A printing method characterized by using a dampening liquid containing at least one of acetylene glycol and acetylene alcohol when printing with desensitized ink on a color developer sheet.