JPS6239677A - Plotting pen for making printed circuit substrate - Google Patents

Abstract

PURPOSE:The titled plotting pen capable of producing a printed circuit substrate by a simple process, removing simply ink after etching, containing built-in resist ink consisting of specific solvent ink, a specific resin and a specific organic solvent to dissolvent the dye and the resin. CONSTITUTION:The aimed plotting pen containing built-in resist ink consisting of solvent dye containing no sulfonic group, no carboxlic group and no group to form a salt of these groups, a resin selected from styrene-maleic acid copolymer half ester, rosin-acrylic ester condensate maleinized rosin half ester, rosin glycerol ester, terphene-phenolic copolymer, hydrocarbon resin and shellac and an organic solvent to dissolve the resin and the dye, having a synthetic resin pen with a through hole having the same crosssectional shape from the tip to the end and the maximum distance value from one end to the other of the through hole of 0.2-0.8mm. EFFECT:Drawing successively a thin line with a constant width.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a plotter pen for making printed circuit boards, which is attached to a computer-driven XY block and used to draw circuits on the copper surface of a board.

2. Description of the Related Art Conventionally, circuits have been formed on the surface of a substrate mainly by screen printing using a photolithographic screen plate and ultraviolet curing resist ink.

Problems to be Solved by the Invention The circuits on the surface of the screen-printed substrate are cured by exposure to ultraviolet light, but the cured resin is three-dimensional and difficult to remove after etching the D-board, resulting in poor workability. .

The present invention solves this problem and replaces the time-consuming process of plate making, printing, and curing by UV exposure with a simple process of creating a program and drawing circuit lines, making it possible to produce printed circuit boards in small quantities and in a wide variety of types. The purpose of the present invention is to provide a plotter pen with built-in resist ink that enables the manufacturing method.

Means and Effects for Solving the Problems The plotter pen of the present invention can withstand the action of an etching solution made of an aqueous ferric chloride solution, but it does not contain specific dyes and resins that are soluble in organic solvents and organic solvents that dissolve them. This pen has a built-in resist ink and has a pen body that produces fine lines with a constant line width from beginning to end.

The dyes used are solpet dyes that do not contain sulfonic acid groups, carboxyl groups, or their salt-forming groups in their structure, and are classified into azo dyes, metal complex azo dyes, triarylmethane dye bases, and anthracite dyes. Examples include quinone dyes and azine dyes.

The resins used are styrene-maleic acid copolymer Hafestel, rosin-acrylic acid ester condensate, maleated rosin Hafestel, rosin glycerol ester, terpene-phenol copolymer, aliphatic type, alicyclic type, aliphatic type. /Alicyclic, aromatic, aliphatic/aromatic,
Examples include hydrogenated alicyclic hydrocarbon resins and shellac.

Examples of organic solvents include lower aliphatic alcohols such as ethyl alcohol, propyl alcohol, and butyl alcohol; glycol ethers such as methyl glycol, ethyl glycol, and methyl glycol; aromatic solvents such as hensyl alcohol and quidylol; hexane, heptane, octane, and cyclohexane. , aliphatic and alicyclic hydrocarbons such as ethylcyclohexane, and mixtures thereof.

The above components are used in an amount of 1 to 40% by weight of the dye, preferably 5 to 20% by weight, and 1 to 40% by weight, preferably 5 to 20% by weight of the resin, based on the total amount of the ink composition.
The remainder is the solvent. Additionally, a small amount of additives may be added as necessary.

Examples of additives include surfactants, polyether-modified silicones, and alkylphenols for suppressing ink bleeding and repelling on the copper surface of the substrate.

Are the dyes, resins and additives dissolved in a solvent?
It is considered to be a liquid type resist ink. This ink has a flow rate of 1 to 20 cps at room temperature, preferably 2 to IQc, so that it constantly flows out from the fine holes in the pen body when drawing a circuit.
It exhibits a low viscosity in the ps range.

Lines drawn on the surface of the substrate with resist ink having such a structure can withstand etching with a ferric chloride solution, but are easily removed by cleaning with an organic solvent.

A plotter pen consists of a barrel with a pen body at the tip, and the resist ink is filled in the barrel, and its structure includes an ink storage body made of a fiber bundle impregnated with ink, which is housed in the barrel. Then, the ink reservoir in the barrel is filled with free ink, and the ink is supplied to the pen body directly or via a relay core, or the ink reservoir in the barrel is filled with free ink, and the pen core (
A type of structure is used that allows ink to flow to the pen body through an ink flow regulator.

The pen body used is a rod-shaped synthetic resin pen body having an axial through hole with substantially the same cross-sectional shape from one end to the other end.

Polyacetal is preferably used as the synthetic resin.

In a pen body made of fiber bundles bound with resin, the line width tends to increase depending on the drawing distance, and it is difficult to manufacture a pen body with a diameter smaller than about 2mm diameter. It is not suitable for drawing thin lines, and since the pen body is made of hard materials such as ceramics and metals, the copper surface of the board comes into contact with the hard material, so it is difficult to deal with minute irregularities on the surface while drawing. Line breakage occurs without cutting. In this respect, the synthetic resin pen body can draw thin lines with a constant line width from beginning to end, and has appropriate flexibility to cope with minute irregularities on the surface of the substrate.

Generally, the line width of a circuit drawn on a printed circuit board is required to be in the range of 0.3 to 0.4 mm.

In order to maintain this line width, the maximum distance (hereinafter referred to as effective inner diameter) between one outer end and the other outer end facing each other across the axis in the cross section of the through hole of the synthetic resin pen body is approximately Q, 2m
It is required that the range is from m to Q, 3 mm. Furthermore, if the amount of ink used to draw the circuit in the etching step after drawing the circuit is too small, it will not be able to withstand side etching and wire breakage will easily occur.

The amount of ink that can withstand this side etch is line width 0.3 to 0.
．． In the case of 4 mm, it is sufficient if it is 5 mg/10 m or more.

If the effective inner diameter of the through hole of the pen body is less than 0.2 mm, it is difficult to supply the above amount of ink.
If it is larger than m, it becomes difficult to maintain a predetermined line width.

EXAMPLES Ten types of plotter pens were prepared using combinations of inks (Table 1), pen bodies, and ink storage bodies having the compositions described below.

Pen body A, synthetic resin pen body (polyacetal molded body, outer diameter 1
．． 0 mm φ round bar shape, effective inner diameter 0.6 mm) B6 synthetic resin pen body (polyacetal molded body, outer diameter 0, 8 m
mφ round rod shape, effective inner diameter 0.38n+m) C, ceramic pen body (outer diameter 0.6tmφ, inner diameter 0.3 zigzag vibrator) D, fiber pen body (polyester fiber resin processed body, outer diameter 2
．． 011φ) Ink storage body The ink composition of the polyester fiber bundle is shown in Table 1, but N116 to 8 are not used in the present invention but are for comparison.

The raw materials in the table are explained according to the note numbers.

(11C, 1, 50415 (Azine) (2) C,
1,5olvent Black 50 (Azine type) (31C, 1,21260 (Disazo type) +41
C,1,21240 (disazo type) (51C,1,21
, 250 (disazo type) (6) C11,26150 (disazo type) + 7) Salt formed product of C, 1,42595 (blue basic dye) and C, 1,74180 (blue direct dye with sulfonic acid group) ( 8) C, 1,42595 (basic dye) (9) Softening point 110.5°C, acid value 86.5αO) Molecular weight 1,05
0. Softening point: 145±5℃.

Acid value 1 or less, specific gravity 1.04 αD average molecular weight approximately 8,000. Melting point 190-200
°C4 acid value 170-185 Softening point 72.2 °C1 acid value 71.0.

Saponification value 224.7. Non-volatile content 98% Q3) Average degree of polymerization 280. Acetyl group 3 mol% or less.

Butyral group 63±3 mol% a4J specific gravity 1.07, softening point 58°C1 acid value 15
8゜Saponification value 182. Iodine number: 122 (151) Smudge prevention agent The following tests were conducted using each of the above-mentioned samples, Pro Tutapen.

Attach the sample pen to the xY plotter and plot three predetermined circuits (approximately 180 m) on the surface of a glass epoxy substrate with a 35 μ thick copper layer (size A4, surface roughness 4 μ) at a pen speed of 10 cm/sec. I made it draw.

The line shape fi (matters related to ink followability such as the presence or absence of line breakage) of the entire circuit was observed, and then the line width at the start and the line width at the end point were measured using a projector.

This substrate was immersed in an etching solution (50% ferric chloride solution) at a temperature of 25°C, etched by rocking in the solution for 15 minutes, washed with water, and dried.The etching resistance of the ink lines was then examined using a microscope. Observed.

Finally, the substrate was washed with industrial ethanol and the state of ink removal was observed.

Effect of the invention Table-2 Test results The evaluation of the results is as follows.

Ink followability ○ The entire line is uniform, no line breakage × There is a line break in some parts of the circuit Etching resistance Solvent cleanability ○ All ink on the circuit has been washed away.As shown in the table, the plotter pen of the present invention draws thin lines with a constant line width from beginning to end on the copper surface of the board. The wires are etching resistant but easily removed by organic solvent cleaning. Therefore, this plotter pen can be used for creating circuit programs, drawing circuits on boards using an XY plotter,
This makes it possible to manufacture printed circuit boards that do not involve the difficulties of etching and solvent cleaning of ink, do not require large-scale equipment, and can be produced in small quantities.

Claims (1)

[Claims] 1. A solpet dye having neither a sulfonic acid group nor a carboxylic acid group nor their salt-forming groups in its structure, a styrene-maleic acid copolymer half ester, a rosin-acrylic acid ester condensate, Built-in resist ink containing as essential ingredients a resin selected from the group consisting of maleated rosin half ester, rosin glycerol ester, terpene-phenol copolymer, hydrocarbon resin, and shellac, and an organic solvent that dissolves the dye and resin. Plotter pen for making printed circuit boards. 2. Having an axial through hole with substantially the same cross-sectional shape from the tip to the rear end, and the distance between one outer end of the through hole and the other outer end located at a position opposite to each other across the axis in the cross section. The maximum value of
．． A plotter pen for producing a printed circuit board according to claim 1, comprising a rod-shaped synthetic resin pen body having a diameter of 2 mm to 0.8 mm.