JPS59182868A - Ink composition for screen printing - Google Patents

Abstract

PURPOSE:To provide the titled composition having extremely excellent separability from the printing plate and giving a printed pattern having large thickness and sharp pattern edge, by adding a fluororesin powder to an ink resin component. CONSTITUTION:The objective composition is prepared by adding preferably 0.5- 20wt% of a fluororesin powder (preferably having a particle diameter of <=5mu), and if necessary, preferably 1-30wt% of a printability-improving agent to the resin component of a screen printing ink.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink composition, and more particularly to an ink composition that is screen printed and used as a resist ink during the production of glint substrates.

Previous screen printing inks had inorganic powders such as silicon nitrate and norconium silicate added to improve printability.The purpose of these printability improvers was to oxidize as a thixotropic agent Silicon is used to control the flow of ink after printing by adjusting thixotropy, and noriconium silicate is added to improve plate release properties.

However, the effect cannot be said to be fully satisfactory, and adding a large amount causes the phenomenon that mesh marks of the screen plate remain on the ink surface after printing, and if gauze with a fine mesh is used, the ink was not transferred well, making it impossible to form a pattern with good reproducibility.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional screen printing ink compositions, improve plate separation properties during screen printing, and obtain a thick pattern with good reproducibility. An object of the present invention is to provide an ink composition for screen printing.

The present invention is characterized in that a fluororesin powder is added to the resin component of the ink for screen printing, and by adding this fluororesin powder, the cythixotropic property is increased.
Utilizing the lubricity of fluororesin, we have dramatically improved plate release properties, eliminating the above drawbacks, and improved lubricity with the screen plate to create an ink that can be extruded in one printing. The present invention provides an ink composition ff for screen printing which can increase the amount of the ink composition ff and obtain a pattern with a thick film thickness and good reproducibility.

The screen printing ink composition according to the present invention will now be briefly described in detail.

Screen printing inks include thermosetting and UV curing inks. As a thermosetting ink,
In addition, some resin components include epoxy resin, alkyl, carbon, melamine, etc., and combinations thereof. Also UV
As a curable ink, for example, as a resin component, epoxy acrylate) r, j? Contains urethane acrylate, etc., and combinations thereof.

Conventionally, the printability agents for thermal film-forming inks and UV curable inks include yanorkonium silicate and aluminum silicate '871.

In the present invention, a fluororesin powder is further added to the above ink composition as a printability improver to dramatically improve printability. As the above-mentioned fluorine 'dt1 fat powder, there is, for example, "Rublon" manufactured by Daikin Industries, Ltd.

A suitable blending amount is one in which 1 to 30 parts by weight of one or more known printability improvers and 0.5 to 20 M acid part of fluororesin powder are added to 100 parts by weight of the resin component in the ink. , these components are fractionally mixed, for example, in a three-roll mill. At this time, it is preferable that the particle size of the fat powder is 5 μm or less, and the finer the particle size, the better the ink surface condition after printing.If the particle size is 5 μm or more,
Irregularities tend to occur on the ink surface. To improve viscosity, use organic bath additives such as Seronorbuno 1 or Calpitol Cheek. If the amount of fluororesin powder is less than 0.5 part by weight, the effect will be reduced, and 20
If the number is larger than the Mt gin part, the mesh of the screen version will remain on the printed matter without being erased.

The ink composition thus prepared can be printed, for example, by screen printing during the production of printed circuit boards, and used as an etching lens or chemical etching resist.

It can be applied to things such as turgornost.

51♀+4) The ink composition of the present invention improves the plate separation property dramatically by 1υ, and can obtain a chassis with a thick arm turn nip with 1 return thickness, so it is suitable for chemical plating. is the best, silver jumper and calf 1
? When it is used as an undercoat for materials such as Ninoyampa, its reliability as a target for Lectinol is improved.

The present invention will be specifically explained below using Example 1 and Comparative Examples.

Practical Example 1-7 and Comparative Example 1 In practical example 1-7, according to the formulation table in Table 1 below, a bisphenol A type epoxy resin, nitrogen phenylmethane as a curing agent, and printing were added. An example of the ink composition of the present invention, in which a fluororesin powder is added to a screen printing ink containing conventionally known silicon oxide and zirconium silicate as a property-improving agent, and a fluororesin powder as a solvent, is described below. As the fluorine-1.4 fat, "Luburon" (trade name) manufactured by Daikin Industries, Ltd. was used.

Moreover, Comparative Example 1 shows a conventional screen printing ink composition that does not contain the above-mentioned fluororesin powder.

Note that Table 1 shows the distribution 8 in parts by weight.

In Table 1, Examples 1 to 4 do not change the composition of Ratio 11 and Interchange 1, but add fluororesin to this, and the amount of addition is resin component: too M 1%, and the ratio is 5 to 20%. The amounts were changed within the range of parts by weight. In Examples 5 to 7, the content of zirconium silicate was reduced from 10 parts by weight to 5 parts by weight, and the content of fluororesin was changed.

The ink prepared with the above composition was given the following MV value. A paper phenol laminate fully coated with a phenol-modified acrylonitrile butadiene rubber adhesive was prepared as an insulating plate, and the adhesive layer was roughened with a chromium-formic acid mixture under certain conditions.

Next, the ink of Comparative Example 1 in which no fluororesin was added and the ink of Examples 1 to 7 of the present invention prepared in Table 1 were printed onto the roughened adhesive-backed laminate using a screen printing method. −
Print according to the conditions! formed a turn. At this time, the indistinguishability of the versions was evaluated.

Next, the printed ink was thermally cured at 140° C. for 50 minutes, and the thickness of the ink and the degree of sagging of the printed pattern relative to the pattern width on the screen plate were measured.

The above results are shown in Table 2.

As is clear from Table 2, by adding fluororesin powder to the ink composition, the plate release properties of the conventional Y/Ryoshi are improved, the ink sag properties are also improved, and thick film formation is improved. It is possible to form a pattern with excellent printing accuracy. The state of improvement in ink sagging is shown on the first page. The drawing shows a cross section of the ink transferred onto the printed matter 1. In the drawing, the solid line 2 shows the cross section of the ink to which the fluororesin was added according to the present invention, and the broken line shows the cross section of the ink to which the fluororesin was added according to the present invention, and the broken line shows the cross section of the ink transferred to the printed matter 1. This shows the U-north surface of the ink.

Implementation jl 8-10 and Comparative Example 2-4> - Stream side s
-10 & Mouth]: Product names UR3100G J, r USR-2G J, which are marketed as Ink Renost and Etching Renost Ink, respectively.
and [SER400J ink, fluororesin powder added to C1 Daikin Industries'"Rubron" (product name).
Examples of ink compositions of the present invention made by adding a small amount of run are shown below.

The inks of Example b-1o were each “UR3100
G J, I' USR-2G J and r SER-4
Daikin Industries, Ltd.'s "Rubro/
'' was added and mixed and dispersed in a three-roll mill.

Comparative Example 2-4 is a sample in which the above fluororesin is not added.
UR3100G J, r USR-2G J and r
5ER-400" ink.

The inks of Example 8-10 and Comparative Example 2-4 above were
Evaluation was carried out under the same conditions and by the same method as in Examples 1-7 above. All of these measurement results are shown in Table 3.

As described above, the ink composition for screen printing according to the present invention has extremely good plate separation properties, and can provide sharp printed gold with a thick film and pattern.

[Brief explanation of the drawing]

The drawing shows a cross section of the ink transferred onto the printed matter.
Ink compositions according to the present invention and conventional ink compositions. This figure shows a comparison of the sagging properties of ink compositions. 1...Printed matter, 2,3...Ink. 1' Agent Teruo Taniyama 1 is also Noriharu Niibe! ,,)r-・; 1

Claims (2)

[Claims] (1) An ink composition for screen printing, characterized in that a powder of 4-4-fluorine-1 fat is added to an ink resin component for screen printing. (2) The particle size of the fluororesin powder is 5 when dispersed in the ink.
The ink composition for screen printing according to item 1 of the scope of Patent No. 17, characterized in that the ink composition is 5 to 20 parts by weight based on the ink resin component.