JPS5998890A - Color mixing inhibiting composition for screen printing - Google Patents

Abstract

PURPOSE:To prevent color mixing in multi-color printing due to pressing, by providing an emulsion having a specific spread meter limit value between different color inks provided on cardboard for screen printing. CONSTITUTION:A W/O type emulsion of which ''the one min value'' is 37 or less by a spread meter and which consists of liquid oil and fat, water and an emulsifier is provided between a plurality of different color inks provided on the base paper for screen printing to prevent the color mixing between the different color inks. The liquid oil and fat are used in order to obtain the W/O type emulsion and any kinds of liquid oil and fat can be used. The emulsifier is used in order to emulsify liquid oil and fat and water and any kinds of emulsifiers can be used, among which one with HLB of 8 or less is especially pref. ''The one min value'' of 37 or less by the spread meter means that the diameter of a specimen obtained when one min is elapsed after 1cc of the specimen is measured according to usual operation by using a transparent plate is 37mm. or less.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition for preventing color mixture for stencil printing, which prevents color mixture between inks that occurs during multicolor printing by stencil printing.

Traditionally, stencil printing uses base paper that is perforated by heating, or perforated with a ballpoint pen or stylus, etc., and ink is placed between the base paper and an impermeable sheet, and it is printed from the impermeable notebook surface. By applying pressure, the ink is transferred from the perforated portion to the printing paper. In recent years, ink has become highly viscous and many sheets have to be printed, so the ink layer becomes thicker. As a result, color mixing occurs between the inks, resulting in printed matter that is significantly different from the original printed matter.

In order to solve this problem, a method has been considered in which a sponge-like material with an adhesive part on one side is cut out and pasted on the base paper to block the ink from different colors, but ■cutting and pasting is time-consuming. It's a hassle. ■If you cut it too thinly, it will be difficult to stick and it will be difficult to use it on detailed areas. ■When making corrections, peel it off to easily damage the original paper. ■There was a problem that once ink was applied, it could not be applied immediately.

Therefore, the inventors of the present invention have conducted intensive research to solve the above problem, and as a result, (1) it can be easily placed between the inks; ■It can be made thick or thin and can be used for details. ■Corrections can be easily made by wiping them off. ■W10 type that satisfies the condition that it can be used immediately even when ink is applied, if the ink is removed, has an F1 minute value d (described later) using a spread meter of 37 or less, and is made of at least liquid oil, water, and emulsifier. They discovered a composition consisting of an emulsion and completed the present invention.

Since the composition for preventing color mixture for stencil printing of the present invention is a liquid colorless composition, it can be easily used for small details by filling it into a tube or any other container and extruding it during use. By placing the ink between the inks below, the ink cannot move any further.

It is a material that prevents color mixing due to its strong contact, and since it is colorless, it does not affect printed matter in any way.

In addition, corrections can be easily made by simply wiping.d Next, each component of the color mixture prevention composition for stencil printing of the present invention will be explained.

Most liquid oils and fats can be used to obtain a W10 type emulsion by mixing with water, but specific examples include machine oil, spindle oil, motor oil, kerosene, and sump oil. Most emulsifiers can be used, but those with an HLB of 8 or less are preferred. Specific examples include sorbitan monooleate, sorbitan thioleate, sorbitan trioleate, and sorbitan sesquioleate.

Fatty acid esters of sorbitan such as sorbitan stearate and sorbitan laurate, glycerin monooleate, and glycerin sterate.

Fatty acid esters of glycerin such as chrycerin trioleate, glycerin sesquioleate, glycerin stearate, and chrycerin laurate can be used.

7 In the present invention, if the "1 minute value" measured by a spread meter is 37 or less, it means that the sample ICC is normally measured using a spread meter (manufactured by Tester Sangyo) using a transparent plastic plate (weight: 115'?, material: Niacrylic resin). This means that the diameter of the sample after 1 minute measured by the above operation is 37 mm or less.

In addition to the liquid oil, water, and emulsifier, rosin-modified alkyd resin, as necessary, is used to improve the fixing properties of the composition.
Rosin modified phenolic resin.

Add resins such as rosin-modified maleic acid resin, drying oil type and non-drying oil type alkino resin.

It is also possible to add substances such as organic bentonite, silanized calcium carbonate, and talc for the purpose of adjusting viscosity.

Next, a method for producing the color mixture prevention composition for stencil printing of the present invention will be briefly described.

After adding an emulsifier to the liquid fat and oil (adding other additives if necessary) and mixing, water is gradually added and mixed and emulsified to obtain a W10 type emulsion.

Hereinafter, the present invention will be explained in more detail with reference to Examples, in which "parts" indicate "parts by weight".

Example 1 Spindle oil 4 parts #60 motor oil 12 parts #40 motor oil 6 parts Sorbitan sesquioleate
5 parts organic bentonite 06 parts water
70 parts Among the above ingredients, organic bentonite was mixed and kneaded with #4° motor oil, spindle oil, +3°
It is mixed with a mixture of motor oil and sorbitan sesquioleate, and water is gradually added to it to emulsify it to form a W10 type emulsion.
．． /) "1 minute value" 32) was obtained using a meter.

Example 2 #30 motor oil 22 parts Rubitan monooleate 5 parts water
70 parts Among the above ingredients, a mixture of #60 motor oil and Nrubitan monooleate was mixed and emulsified by gradually adding water while stirring to form a W10 type emulsion, and a colorless cream composition (spread meter) was prepared. The "1 minute value" (O) is obtained.

Example 3 Spindle oil 6 parts #30 motor oil 8 parts Sorbitan sesquioleate 4 parts Rosin modified alkyd
6 parts water
60 parts Among the above ingredients, spindle oil, #
30 motor oil, sorbitan sesquioleate, and rosin modified alkyd resin mixed and dissolved.

While stirring, water was gradually added to mix and emulsify the mixture to form a W10 type emulsion, yielding a colorless cream composition (1 minute value measured by a spread meter of 28).

The compositions obtained in Examples 1 to 6 above were placed in a tube and placed on base paper ("Print Master" manufactured by Riso Kagaku ■) which had been perforated by heating, and different colored inks ( As a result of printing 50 sheets per base paper using a simple printing device ("Print Gokko" manufactured by Riso Kagaku ■), there was almost no difference between the first print and the 500th print due to the movement of ink, No color mixing was observed.

As shown above, the color mixture prevention composition for stencil printing of the present invention is easy to use and is excellent in reliably preventing color mixture of inks.

Patent applicant: Pentel Co., Ltd.

Claims (1)

[Claims] In a stencil printing method in which a plurality of different color ink layers are provided on a stencil printing base paper and a pressing force is applied to the ink layers, the different color ink passes through holes in the base paper and prints in multiple colors on the printing surface. By placing the inks in between, color mixing between different color inks can be prevented. “1 minute [
1 is 67 or less, and the color mixture prevention composition for stencil printing is comprised of a W/O type emulsion comprising at least liquid oil, water, and an emulsifier.