JPH10335780A - Perforating work of printed wiring board and cover plate therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the prevention of heat generation of a drill, the elimination of drilling tailings and the arrangement work of a laminated material, by a method wherein a film formed by reacting a film-forming property resin with a lubricating agent is provided on the surface of a skin material consisting of a composite aluminium foil formed by covering a pure aluminium skin material on the surface of an aluminium alloy core material. SOLUTION: A water-soluble solid lubricant for perforating work containing a film-forming property resin which consists of a copolymer having a repeat unit which is shown by the formula I, and a lubricating agent which is shown by the formula II is applied on the surface of the skin material on one side of the skin materials of a clad material, which is composed of a composite aluminium foil formed by covering a pure aluminium skin material on one surface or both surfaces of an aluminium alloy core material, and is thermoset to the skin material. Moreover, the film-forming property resin is reacted with the lubricating agent to provide a formed film on the surface of a skin material consisting of the composite aluminium foil and a cover plate for perforating work use is formed. (In the formulas, the R1 is an isogeneous or homogeneous -H or -CH3 , the R2 is an alkyl group of 1 to 6C, the (n) is an integer of 0 to 2, the (t) is an integer of 2 to 8, the Am is an ammonia or a primary to a ternary alkyl and the (w) is an integer of 45 to 230).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing plate for a printed wiring board and a printing method which are preferably used when a laminated body in which a metal foil is adhered to an insulator is subjected to a perforating process for front and back conduction. The present invention relates to a method for boring a wiring board.

[0002]

2. Description of the Related Art US Pat. No. 4,783 / 78 discloses a method in which a laminated body in which a metal foil is adhered to an insulator is subjected to drilling for conduction between the front and back sides by disposing a water-soluble lubricant on one or both sides of the laminated body.
1,495 and USP-4,929,370. In these methods, solid waxes such as diethylene glycol and dipropylene glycol, synthetic waxes such as fatty acids, and nonionic surfactants are used as solid water-soluble lubricants. A sheet obtained by impregnating a mixture of the above with a porous sheet such as paper is used. By the way, the performance required for the sheet used for the drilling process is that the drill bit has good positioning properties, the drill bit is not easily damaged, the shavings are easily discharged, and the printed wiring board is drilled. There is no occurrence of smear (seizure) on the inner wall (cut surface), and the cut surface is clean. However, in the above-described drilling method, when the hole diameter formed in the laminate is smaller than 0.35 mm, particularly as small as about 0.25 mm or less, the effect of preventing heat generation from the drill is insufficient and the hole in the hole of the printed wiring board is not sufficiently formed. There were problems such as generation of smear, breakage of the drill bit, poor impregnation of the mixture into the porous sheet, and stickiness.

A method of arranging a drill by arranging a specific water-soluble lubricant is disclosed in JP-A-4-92488 and JP-A-4-9488.
2489, 4-92490, 4-92491, 4
-92492 and 4-92493. In these methods, a water-soluble lubricant having a molecular weight of 600 to 600 is used.
9,000 polyethylene glycol, polyoxyethylene monoether, polyoxyethylene ester,
Polyoxyethylene sorbitan monoester and polyoxyethylene propylene block polymer are used. However, although these methods have been improved, they have been unsatisfactory in the effect of preventing heat generation from the drill. JP-A-4-92494 discloses a water-soluble lubricant sheet made of polyethylene glycol 2 having a molecular weight of 10,000 or more.
A method using a mixture formed from 0 to 90% by weight of a water-soluble lubricant and 80 to 10% by weight is disclosed. However, in this method, although the effect of preventing heat generation by the drill is improved, there is a problem that the sheet is easily broken and the handling property is poor.

To solve the above-mentioned problems, Japanese Patent Laid-Open Publication No. Hei 8-197496 discloses a water-soluble lubricant sheet containing 20 to 90% by weight of a polyethylene polypropylene glycol tolylene diisocyanate copolymer and 80 to 10% by weight of a water-soluble lubricant. Discloses a method using a mixture formed from a mixture of the above-mentioned compounds, wherein polyethylene glycol having a molecular weight of 600 to 9,000, monoether of polyoxyethylene, ester of polyoxyethylene, polyoxyethylene sorbitan is used as a water-soluble lubricant. One or two or more selected from the group consisting of monoesters, polyglycerin monostearate and polyoxyethylene propylene block polymers are used. Then, when a hole is formed in the copper-clad laminate using the water-soluble lubricant sheet having such a configuration, for example,
A plurality of copper clad laminates 51 laminated as shown in FIG.
Is applied to a backing plate 52 made of aluminum foil and a waste board 5 made of paper phenol.
3 and a water-soluble lubricant sheet 55 is adhered to the upper surface of the backing plate 52.
The drill 56 was used to make holes.

However, in this method, since the water-soluble lubricant sheet 55 superimposed on the backing plate 52 is curled, it is difficult to arrange the water-soluble lubricant sheet 55 on the copper-clad laminate 51, and the water-soluble lubricant sheet 55 When the tape was fixed on the backing plate 52 with a vinyl tape after being overlaid, it was difficult to fix the tape because of poor tape adhesiveness. In addition, when drilling is repeated, water-soluble lubricant, aluminum, copper, glass fiber, etc. may adhere to the tip of the drill bit and drips onto the laminate or splatters around while moving the drill bit. In addition, the drill bit sometimes bends when drilling is performed at a place where the attached matter attached to the tip of the drill bit falls down. In addition, since the water-soluble lubricant sheet 55 has poor heat resistance and moisture resistance, it must be stored at an ambient temperature of 30 ° C. or lower, and once it absorbs moisture, the surface becomes sticky and the adhesiveness of the tape increases. However, there is a drawback that the adhered substance is liable to fall as described above. Further, since the water-soluble lubricant sheet 55 is expensive, there is a problem that the cost for perforation processing is high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has good heat resistance and moisture resistance in addition to good positioning of a drill bit, an effect of preventing heat generation of a drill, and a property of discharging shavings. Good tape adhesion, no stickiness, good handling, easy to place on the laminate, and inexpensive printed wiring board piercing plate and printed wiring board using this It is an object of the present invention to provide a drilling method.

[0007]

According to the first aspect of the present invention,
One or both surfaces of an aluminum alloy core material are clad on a surface of at least one of the cladding materials composed of a composite aluminum foil coated with pure aluminum skin material comprising aluminum and unavoidable impurities by the following general formula (I) or (II): )

[0008]

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A film-forming resin (a) comprising a copolymer having a repeating unit represented by the following formula (III):

[0010]

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A water-soluble solid lubricant for drilling a printed wiring board containing the lubricating agent (b) shown in (b) is applied and baked to form a film-forming resin (a) in the water-soluble solid lubricant. And a lubricating agent (b), and a coating plate formed by reacting the lubricating agent with the lubricating agent (b).

Further, in the invention according to claim 2, the film-forming resin (a) in the water-soluble solid lubricant has an average molecular weight of 20.
The patch for punching a printed wiring board according to claim 1, wherein the number is from 000 to 2,000,000. Further, polyoxyethylene group invention according to claim 3, lubricity providing agent in the water-soluble solid lubricant _{(B) (- (CH 2 CH 2} O) w -) average molecular weight of the portion of 2, The patch for punching a printed wiring board according to claim 1 or 2, wherein the number is from 000 to 10,000.

Further, the invention according to claim 4 is characterized in that the film-forming resin (a) and the lubricity-imparting agent (b) in the water-soluble solid lubricant are provided.
Is in a weight ratio of 100: 20 to 2 in terms of solid content.
The patching plate for punching a printed wiring board according to claim 1, wherein the number is 00. Further, the invention according to claim 5 provides the film-forming resin (a) and the lubricity imparting agent (b) in the water-soluble solid lubricant.
The plate for punching a printed wiring board according to any one of claims 1 to 4, characterized in that the hydrogen ion concentration of each of them is pH 4 to 9, respectively.

According to a sixth aspect of the present invention, the core material of the clad material contains 0.3 to 1.5% by weight of Mn, and the balance consists of aluminum and unavoidable impurities. 0.3 to 1.5% by weight, 0.1 to 1.3% by weight of Mg, and the balance consisting of aluminum and unavoidable impurities;
1.5% by weight, and 0.1 to 1.3% by weight of Mg
Containing 0.05 to 0.25% by weight of Cu;
6. A hole for a printed wiring board according to claim 1, wherein the remainder is made of any one of aluminum alloys selected from aluminum and inevitable impurities. The backing plate is a means for solving the problem.

According to a seventh aspect of the present invention, the thickness of the coating made of the water-soluble solid lubricant for drilling the printed wiring board is 1 to 100 μm. The patching plate for punching a printed wiring board described in (1) is a means for solving the above-mentioned problem. Claim 8
In the invention described in the above, the thickness of the core material of the clad material is 50 to 3
The patch for punching a printed wiring board according to any one of claims 1 to 7, characterized in that the patch is 00 µm and the thickness of the skin material is 5 to 50 µm.

According to a ninth aspect of the present invention, there is provided a laminate in which a metal foil is adhered to an insulator, and a drilling hole for front / back conduction is provided on one or both sides of the laminate. A method for forming a hole in a printed wiring board, characterized in that the method is carried out by arranging a patch for forming a hole in the printed wiring board described in (1).

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail. The water-soluble solid lubricant for drilling a printed wiring board used in the present invention (hereinafter, abbreviated as a water-soluble solid lubricant for drilling) is represented by the general formula (I).
Or, it contains a film-forming resin (a) composed of a copolymer having a repeating unit represented by (II) and a lubricity imparting agent (b) represented by the general formula (III).

The average molecular weight of the film-forming resin (A) is 200,000 to 2,000,000, preferably 500,000 to 1,800,000, more preferably 800,000 to 1,400, 000. When the average molecular weight of the film-forming resin (a) is less than 200,000, the water-soluble solid lubricant is applied to one or both sides of a cladding material described later to form a punching plate under high humidity. Stickiness occurs and the average molecular weight is 2,000.
If it exceeds 000, the effect of preventing drill heat generation is insufficient.
This is because the seizure resistance is reduced. The polyoxyethylene group lubricity imparting agent (B) (- (CH ₂ CH ₂
O) _w - The average molecular weight of the portion of) 2,000～1
000, preferably 3,000 to 8,000, more preferably 4,000 to 6,000. Polyoxyethylene group lubricity imparting agent _{(B) (- (CH 2 CH 2} O)
_If the average molecular weight of the portion ( _w- ) is less than 2,000, the water-soluble solid lubricant is applied to one or both surfaces of the clad material, resulting in stickiness under high humidity in a piercing plate. If the average molecular weight exceeds 10,000, the effect of preventing heat generation from the drill is insufficient, and the seizure resistance is reduced.

The hydrogen ion concentration of the film-forming resin (a) and the lubricity-imparting agent (b) is respectively pH 4 to 9, preferably pH 6 to 7.5. PH of film-forming resin (a)
If the pH is less than 4, corrosion cladding may be generated on the clad material, and if the pH is more than 9, poor drying of the coating made of the water-soluble solid lubricant applied to the surface of the clad material may be caused. Further, the pH of the lubricity imparting agent (b) is 4
If the pH is less than 9, stickiness remains due to a decrease in reactivity with the film-forming resin (a), and if the pH exceeds 9, poor drying or coloring of the lubricating film occurs.

The compounding ratio of the film-forming resin (a) and the lubricity-imparting agent (b) in this water-soluble solid lubricant is 100: 20 to 200, preferably 100: 20, in terms of solid content.
It is 50-160, more preferably 100: 90-130. If the proportion of the lubricity-imparting agent (b) is less than 20 parts by weight per 100 parts by weight of the film-forming resin (a), the effect of preventing heat generation from the drill is insufficient, and the seizure resistance is reduced. If the ratio of the lubricity imparting agent (b) exceeds 200 parts by weight, stickiness will occur under high humidity. Further, in the copolymer constituting the film-forming resin (A) represented by the general formula (I) or (II), the following structural formula (a-
1)

[0021]

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The content of the structural unit represented by the formula is 10 to 2
0% by weight, preferably 13 to 18% by weight.

Examples of the method for producing such a water-soluble solid lubricant include acrylonitrile (a), a conjugated and / or non-conjugated monomer (b) having a hydroxy group, and a conjugated monomer having a carboxyl group. (C), having 1 to 1 carbon atoms
Copolymer (A) obtained by co-polymerizing a conjugated monomer (d) having a saturated linear and / or side chain alkyl group of No. 6
Is neutralized with an organic amine compound (e) to synthesize a film-forming resin (a) comprising a copolymer having a repeating unit represented by the general formula (I) or (II). , Polyethylene glycol (g) and organic dibasic oxyacid (h)
Diester dibasic oxyacid (B) obtained by reacting
Is neutralized with an organic amine compound (f) to synthesize a lubricity-imparting agent (b) represented by the general formula (III), and then the synthesized film-forming resin (a) and lubricity-imparting property It can be produced by mixing the agent (b) at a weight ratio in the above range.

A conjugated and / or non-conjugated monomer having a hydroxy group used in the synthesis of the copolymer (A) (b)
Examples thereof include 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, hydroxypropyl methacrylate, hydroxypropyl acrylate, and 2-hydroxyethyl vinyl ether. As the conjugated monomer (c) having a carboxyl group, for example, acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and the like are used. Examples of the conjugated monomer (d) having a saturated linear and / or side chain alkyl group having 1 to 6 carbon atoms include methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, n-butyl acrylate, and amyl. Methacrylate, amyl acrylate and the like are used. Examples of the organic amine compound (e) for neutralizing the acid group of the copolymer (A) include, for example, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, and ammonia Are used.

The usage ratio (weight ratio) of each monomer used in the synthesis of the copolymer (A) is acrylonitrile (a): a conjugated and / or non-conjugated monomer (b) having a hydroxy group. ): Conjugated monomer having a carboxyl group (c): Conjugated monomer having a saturated linear and / or side chain alkyl group having 1 to 6 carbon atoms (d) = 10 to 20: 5
15: 3 to 15:55 to 82. If the use ratio of acrylonitrile (a) is less than 10, the adhesion to the clad material will be poor, and if it exceeds 20, the film-forming resin (a)
This is because the value of the glass transition temperature (T _g ) of itself increases and the film made of the water-soluble solid lubricant becomes hard and brittle. When the use ratio of the conjugated and / or non-conjugated monomer (b) having a hydroxy group is less than 5, the adhesion to the clad material is deteriorated, or the compatibility with the lubricity imparting agent (b) is reduced. This is because if it exceeds 15, stickiness will remain on the film made of the water-soluble solid lubricant applied to the clad material. When the use ratio of the conjugated monomer (c) having a carboxyl group is less than 3, the reactivity with the lubricity-imparting agent (b) becomes poor, or the adhesion with the clad material becomes poor,
15 rises beyond the T _g value of the film forming resin (A) itself to since become brittle resin. When the usage ratio of the conjugated monomer (d) having a saturated linear and / or side chain alkyl group having 1 to 6 carbon atoms is less than 55, the resinous performance of the film-forming resin (a) itself That is, the film formability is poor, and if it exceeds 82, poor adhesion and poor reactivity will occur.

As the polyethylene glycol (g) used for the synthesis of the diester dibasic oxyacid (B), for example, polyethylene glycol having an average molecular weight of 2,000 to 10,000 is suitably used. As the organic dibasic oxyacid (h), for example, succinic acid, glutaric acid,
Adipic acid, sebacic acid and the like are used. The diester dibasic oxyacid (B) synthesized here has the following general formula (IV)

[0027]

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[0028] Examples of the organic amine compound (f) that neutralizes the acid group of the diester dibasic oxyacid (B) include, for example, ammonia, triethylamine, monoethanolamine, diethanolamine,
Triethanolamine or the like is used. When the acid group of the copolymer (A) is neutralized with the organic amine compound (e), the degree of neutralization of the obtained film-forming resin (a) is performed until the hydrogen ion concentration becomes pH 4 to 9. . A lubricity-imparting agent obtained when the acid group of the diester dibasic oxyacid (B) is neutralized with an organic amine compound (f) (b)
Is performed until the hydrogen ion concentration becomes pH 4 to 9.

FIG. 1 is a cross-sectional view showing a first embodiment of a patching plate for a printed wiring board according to the present invention. The piercing plate for a printed wiring board according to the first embodiment (hereinafter abbreviated as a piercing plate) is a composite in which a pure aluminum skin 2 is coated on one surface of an aluminum alloy core 1. Cladding material 3 composed of aluminum foil
The aforementioned water-soluble solid lubricant for drilling is applied to the surface of the skin material 2 and baked, and the film-forming resin (a) and the lubricity imparting agent (b) in the water-soluble solid lubricant react with each other. This is provided with a film 4 formed by deposition.

As a material forming the core material 1 of the cladding material 3, a material harder than a material forming the skin material 2 described later is used, containing 0.3 to 1.5% by weight of Mn and the remainder being aluminum. And 0.3 to 1.5% by weight of Mn, and 0.1 to 1% of Mg.
3% by weight, the balance consisting of aluminum and unavoidable impurities, 0.3 to 1.5% by weight of Mn, 0.1 to 1.3% by weight of Mg, and C
Any one of aluminum alloys containing 0.05 to 0.25% by weight of u and the remainder consisting of aluminum and inevitable impurities is preferably used. Specific examples of the aluminum alloy used here include 3000 series alloys such as 3003 alloy and 3004 alloy. The thickness of the core material 1 is 50 μm to 3 μm.
It is 00 μm, preferably 80 to 250 μm, more preferably 100 to 180 μm. The thickness of the core material 1 is 50 μ
If it is less than m, the handleability will be poor and the positioning of the drill will be degraded. On the other hand, if the thickness exceeds 300 μm, the seizure resistance decreases, which is economically disadvantageous.

As the material forming the skin 2 of the clad material 3, a soft material is used, and a pure aluminum-based material composed of aluminum and unavoidable impurities is suitably used, and a specific example is a 1000-type alloy. This skin material 2
Has a thickness of 5 to 50 μm, preferably 20 to 40 μm. If the thickness of the skin material 2 is less than 5 μm, a positional shift of the drill bit is likely to occur when drilling, and the positioning property is deteriorated. On the other hand, when the thickness exceeds 50 μm, the seizure resistance decreases.

The film 4 forms a lubricity-imparting agent (a) between the film-forming resin (a) and the lubricity-imparting agent (b) by reacting the film-forming resin (a) and the lubricity-imparting agent (b) in the water-soluble solid lubricant. B) is crosslinked to form a network structure. The thickness of the film 4 is 1 to 100 μm, preferably 5 to 50 μm, and more preferably 10 to 20 μm. The thickness of the coating 4 is 1
If it is less than μm, the seizure resistance is reduced. On the other hand, if it exceeds 100 μm, it absorbs moisture under high humidity and stickiness is likely to occur, and it is economically disadvantageous. As a method of forming the film 4 on the surface of the skin material 2,
For example, the water-soluble solid lubricant having the above-described configuration is applied to the surface of the skin material 2 by an application method such as a dipping method, a spray method, a gravure coating method, and a roll coating method.
50 ° C., preferably at 100 to 200 ° C., for 3 to 60 seconds,
Preferably, it can be formed by baking for 10 to 30 seconds and drying.

In the punching backing plate of the first embodiment, the film 4 reacts with the film-forming resin (a) and the lubricity-imparting agent (b) in the water-soluble solid lubricant. Since it is a film formed, there is almost no stickiness on the surface even at high temperature compared to the case where a film forming resin (a) and a lubricity-imparting agent (b) are simply mixed. Since the material has little hygroscopicity, the adhering matter attached to the tip of the drill bit does not fall off during drilling, and damage to the drill bit due to the falling off of the adhering matter can be prevented. In addition, since the coating 4 has good film quality, the tape has good adhesiveness to the tape, and the punching plate can be fixed to the laminate by tape. Further, in the conventional apparatus in which the water-soluble lubricating sheet is superimposed on the backing plate made of aluminum foil, the water-soluble lubricating sheet curls and it is difficult to arrange the water-soluble lubricating sheet on the laminate. In the opening plate, the above-mentioned water-soluble solid lubricant is applied to the surface of the skin material 2 of the cladding material 3 and baked to form the coating 4, so that the covering plate is prevented from breaking or curling. Can be prevented, the handleability is improved, and the work of arranging on the laminate is easy. In addition, since the cladding material 2 is made of a soft material made of pure aluminum, the bitness of the drill bit during drilling is good, the positioning accuracy is good, and the positioning of the drill bit is good. Since it is excellent and has cushioning properties, damage to the drill bit is reduced, and damage to the drill bit can be prevented. In addition, since the core material 1 of the clad material 3 is made of a hard material such as an aluminum alloy, seizure of the drill bit hardly occurs, and the effect of preventing heat generation of the drill is good. Further, the punching backing plate according to the first embodiment has an advantage that the shavings are easily discharged and the cost is low.

FIG. 2 shows a second embodiment of the piercing plate according to the present invention. The difference from the piercing plate of the first embodiment shown in FIG. The coating 4 is provided on the surface of each skin 2 of the clad material 3 in which both surfaces of the aluminum alloy core 1 are coated with the pure aluminum skin 2. With the above-described configuration, the punching plate of the second embodiment has substantially the same operational effects as the punching plate of the first embodiment.

FIG. 3 is an explanatory view showing an example of an embodiment of a method for boring a printed wiring board according to the present invention. The drilling method for a printed wiring board according to the present embodiment uses a NC drill 6 for drilling holes for front and back conduction using a NC drill 6 in the laminate 5 in which a metal foil is bonded to an insulator. A plurality of sheets (four sheets in the drawing) are laminated to form a laminate 7, and the punching patch 10 of the above-described first or second embodiment is arranged as an upper patch on the upper surface of the laminate 7. 7
This is a method in which the lower backing plate 11 is arranged on the lower surface of the device.

Here, the laminated body 5 to be perforated is a material used for various printed wiring boards in which a metal foil and an electrical insulator are integrated. Examples thereof include a multilayer metal foil-clad laminate having a printed wiring network in the inner layer, and a metal foil-clad plastic film.
As the lower backing plate 11, a bakelite plate, a paper-phenol laminate plate, or the like may be used, or the perforation backing plate of the above-described first or second embodiment may be used. When the upper backing plate is arranged on the upper surface of the laminate 7, when the punching backing plate 10 of the first embodiment is used as the upper backing plate, the stacking is performed so that the surface on the coating 4 side is the drill bit side. It is arranged on the upper surface of the object 7.

The number of rotations of the NC drill 6 during the drilling operation is 100,000 to 140,000 rpm when the drill bit has a small diameter.
p. m. And the feed rate is about 1500 mm / min. The hole diameter of the holes 12 formed in the laminate 5 is not particularly limited, but the hole diameter is less than 0.35 mm, and particularly preferably 0.1 mm.
When it is 25 mm or less, the effect of the punching backing plate 10 of the present embodiment can be exhibited.

In the method of forming a hole in a printed wiring board according to this embodiment, a laminate 5 in which a metal foil is adhered to an insulator is used.
Drilling for front and back conduction is performed by arranging the patching plate 10 of the above-described first or second embodiment on one or both surfaces of the laminated body 5 so that the bit of the drill bit is caught. Since the drill bit has good properties and can prevent the displacement of the drill bit, the positioning property of the drill bit is excellent. Also,
The piercing plate 10 used in the piercing method of this embodiment has almost no surface stickiness even at a high temperature.
In addition, since there is little hygroscopicity under high humidity, it is possible to prevent the drill bit from being damaged due to the falling off of the deposit attached to the tip of the drill bit. In addition, since the effect of preventing heat generation from the drill and the ability to discharge shavings are good, the hole 1
No smear (seizure) occurs on the inner wall (cut surface) of No. 2, a clean cut surface can be obtained, and the quality of the hole 12 can be improved. Further, a punching plate 10 to be used is used.
Is easy to arrange on the laminate 5 because of good handling properties.
Since the skin material 2 has a cushioning property, the NC drill 5 is hardly damaged, and the life of the drill bit is prolonged. Therefore, there is almost no exchange of the drill due to the damage, so that the time required for drilling can be greatly reduced. is there. Further, the piercing plate 10 used in the piercing method of the present embodiment.
Is inexpensive, so that the drilling cost can be reduced.

[0039]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only these Examples. (Experimental example) Acrylonitrile (a) is acrylonitrile (hereinafter abbreviated as AN; manufactured by Mitsui Toatsu Chemicals, Inc.)
And hydroxypropyl acrylate (abbreviated as HOPA; light ester HOP, manufactured by Kyoeisha Chemical Co., Ltd.) and / or 2-hydroxyethyl vinyl ether (as a conjugated and / or non-conjugated monomer (b) having a hydroxy group) The conjugated monomer (c) having a carboxyl group is crotonic acid (hereinafter abbreviated as CA) using HEVE (hereinafter, abbreviated as HEVE).
Using a primary reagent, Wako Pure Chemical Industries, Ltd.) and maleic anhydride (hereinafter abbreviated as MA; manufactured by Takeda Pharmaceutical Co., Ltd.), a saturated linear and / or side chain alkyl group having 1 to 6 carbon atoms. Ethyl acrylate (hereinafter abbreviated as EA; manufactured by Toa Gosei Chemical Industry Co., Ltd.) and / or n-butyl methacrylate (hereinafter N)
Abbreviated as BMA. Using light ester NB, manufactured by Kyoeisha Chemical Co., Ltd.), these monomers were copolymerized in the amounts shown in Tables 1 to 3 below to obtain a copolymer, and the acid groups of the copolymer were 25% The film-forming resin (a) was neutralized using ammonia water (first-class reagent, manufactured by Wako Pure Chemical Industries, Ltd.) and diethanolamine (manufactured by Mitsui Toatsu Co., Ltd.). Then, polyethylene glycol (hereinafter abbreviated as PEG) # 2,000 as polyethylene glycol (g).
0, # 4,000, # 6,000, # 10,000 (manufactured by Lion Corporation), respectively, and succinic acid (hereinafter abbreviated as SA) as an organic dibasic oxyacid (h). ), Adipic acid (hereinafter abbreviated as AJ, manufactured by Asahi Kasei Kogyo Co., Ltd.), sebacic acid (hereinafter, SE)
Abbreviated as A. (Toyukuni Oil Co., Ltd.), the acid groups of diester dibasic oxyacids (B) obtained by reacting them in the amounts shown in Tables 1 to 3 below using 25% ammonia water. Then, a lubricity imparting agent (b) was synthesized.
Furthermore, a water-soluble solid lubricant (Sample Nos. 1 to 50) was prepared by mixing the synthesized film-forming resin (A) and the lubricity-imparting agent (B) at the ratios shown in Tables 1 to 3 below. Tables 4 and 5 show water-soluble solid lubricants (Sample No. 1).
The characteristic values of the film-forming resin (A) and the lubricity-imparting agent (B) used in the synthesis of (50) are shown below.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

[Table 3]

[0043]

[Table 4]

[0044]

[Table 5]

The film-forming resins (a) and lubricity in Tables 1 to 3
The compounding ratio of the imparting agent (b) is 1 solid content of the film-forming resin (a).
Ratio of solid content of lubricity imparting agent (b) to 00 parts by weight
And the molecular weights in Tables 4 and 5 are polyoxyethylene.
Len group (-(CH_TwoCH_TwoO) _w-) Average molecular weight
It is.

Using various clad materials in which the thickness of the aluminum alloy core material and the thickness of the pure aluminum clad material were changed, the surface of the clad material was roll-coated with a water-soluble solid lubricant at different application amounts. Apply by method, 150
Table 6 by baking for 20 seconds at
-Plates for punching (test pieces No. 1 to 102) having the structure shown in Table 9 were produced. Here, 3004 alloy was used as the aluminum alloy as the core material, and 1050 alloy was used as the skin material. Then, when drilling holes for conducting on the front and back of a copper foil clad laminate having a thickness of 1 mm under the following conditions, positioning of the drill bit, anti-seizure property, handling property of the drilling patch, high humidity We evaluated the stickiness and cost below. Table 6 shows the results.
To Table 9.

(Drilling condition) Drill bit 0.25 mmφ Number of rotations 100,000 rpm Feed rate 15 m / min Hit number 3000 hits (Arrangement) From drill bit side Drilling patch (coating side) The side is the drill bit side) /
Three copper foil-clad laminates / 1.5m thick bakelite board

[0048]

[Table 6]

[0049]

[Table 7]

[0050]

[Table 8]

[0051]

[Table 9]

In Tables 6 to 9 above, in the column of drill bit positioning, a circle indicates the error of the hole position of the lowermost laminated plate among the three laminated plates, and the standard deviation of the error distance. Is less than 15 μm, and x is that the standard deviation of the error distance is 15 μm or more. Further, in the column of seizure resistance, ○ indicates that the degree of seizure was 5 or less when evaluated (1: small seizure, 5: large number of seizures), and x indicates 3 or more. In the column of handling properties, ○ indicates no curl of the plate and good adhesion of the tape, and x indicates that the curl of the plate is observed or the adhesion of the tape is poor. In the column of hygroscopicity under high humidity, ○ indicates that the weight increase of the film made of the water-soluble solid lubricant when left in an atmosphere of 40 ° C. and a relative humidity of 80% for 1 hour is less than 10%. And x are those in which the weight increase of the film composed of the water-soluble solid lubricant is 10% or more.

Comparative Example 40% by weight of a polyethylene polypropylene glycol tolylene diisocyanate copolymer (F-210 manufactured by Sanyo Chemical Industries, Ltd.) and 60% by weight of a water-soluble lubricant were kneaded at a temperature of 80 to 120 ° C. (in N ₂ gas). ), Water-soluble lubricant sheets having different thicknesses (Comparative Examples 1 to 21) were produced with an extruder. Table 1 shows the components and thickness of the prepared water-soluble lubricant sheets (Comparative Examples 1 to 21).
0 to Table 12. Then, when drilling holes for conducting on the front and back of a copper foil clad laminate having a thickness of 1 mm under the following conditions, positioning of the drill bit, anti-seizure property, handling property of the drilling patch, high humidity Stickiness below,
The cost was evaluated in the same manner as in the test example. The results are shown in Tables 10 to 12.

(Drilling conditions) Drill bit 0.25 mmφ Number of rotations 100,000 rpm RPM 15 m / min Number of hits 3000 hits (Arrangement) Water-soluble lubricant sheet / 150 μm aluminum foil / Three copper foil-clad laminates / 1.5 mm thick bakelite board

[0055]

[Table 10]

[0056]

[Table 11]

[0057]

[Table 12]

[0058]

As described above, in the backing plate for punching a printed wiring board according to the present invention, in particular, the film is provided with a film-forming resin (a) in a water-soluble solid lubricant and a lubricity imparting property. Since the film is formed by reacting with the agent (b), the surface is sticky even at a high temperature compared to a mixture of the film-forming resin (a) and the lubricity-imparting agent (b). There is almost no
In addition, since there is little hygroscopicity under high humidity, it is possible to prevent the attachments attached to the tip of the drill bit from dropping when drilling, and to prevent damage to the drill bit due to the attachment falling off. Can be. In addition, since the coating has good film quality, the tape has good adhesiveness, and the punching plate can be fixed to the laminate by tape. Further, in the conventional device in which the water-soluble lubricating sheet is laminated on the backing plate made of aluminum foil, the work of curling the water-soluble lubricating sheet and disposing the water-soluble lubricating sheet on the laminate was difficult. On the backing plate, the above-mentioned water-soluble solid lubricant is applied and baked on the surface of at least one of the cladding materials formed by coating pure aluminum skin on one or both surfaces of the aluminum alloy core material to form a film. Therefore, it is possible to prevent the caul plate from being cracked or curled, to improve the handleability, and to facilitate the work of disposing the caul plate on the laminate.

Further, since the cladding material is made of a soft material of pure aluminum, the drill bit has good biting properties during drilling, has good positioning accuracy, and has excellent positioning properties. Is excellent, and
Due to the cushioning property, damage to the drill bit is reduced, and damage to the drill bit can be prevented.
In addition, since the core material of the clad material is made of a hard aluminum alloy, seizure of the drill bit hardly occurs, and the effect of preventing heat generation of the drill is good. further,
ADVANTAGE OF THE INVENTION The backing plate for drilling of the present invention has an advantage that it is easy to remove shavings and is inexpensive.

Further, in the method for boring a printed wiring board according to the present invention, a drill having holes for front and back conduction is formed on a laminate in which a metal foil is adhered to an insulator, on one or both sides of the laminate. By arranging the punching backing plate of the present invention, the drill bit has good biting properties and the displacement of the drill bit can be prevented, so that the drill bit positioning property is excellent. In addition, the piercing plate used in the piercing method of the present invention has almost no stickiness on the surface even at a high temperature, and has little hygroscopicity under a high humidity. Damage to the drill bit due to dropping can also be prevented. Also,
Since the effect of preventing heat generation from the drill and the ability to discharge shavings are good, there is no occurrence of smear (burn-in) on the inner wall (cut surface) of the formed hole, and a clean cut surface is obtained, and the quality of the hole is improved. Can be. In addition, the work of placing the punching plate on the laminate is easy because the punching plate used has good handling properties, and the skin material of the punching plate has cushioning properties, so that the drill can be used. Since the drill bit is hard to be damaged and the life of the drill bit is extended, the drill is hardly replaced due to the damage, so that the drilling time can be greatly reduced. Furthermore, since the piercing plate used in the piercing method of the present invention is inexpensive, the piercing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of a patching plate for a printed wiring board according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of a patching plate for a printed wiring board according to the present invention.

FIG. 3 is an explanatory view showing an example of an embodiment of a method for boring a printed wiring board according to the present invention.

FIG. 4 is an explanatory view showing an example of a conventional method for punching a printed wiring board using a water-soluble lubricant sheet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Aluminum alloy core material, 2 ... Pure aluminum skin material, 3 ... Clad material, 4 ... Coating, 5 ... Laminated body, 6 ...
NC drill, 10 ... Plate for drilling, 12 ... Hole.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C09D 133/18 C09D 133/18 171/02 171/02 (72) Inventor Ken Kenmata 85 Hiramatsu, Susono-shi, Shizuoka Prefecture Mitsubishi Aluminum Corporation Inside the Technology Development Center (72) Inventor Chihiro Masago 11-45 Shinkokomadai, Ikoma City, Nara Prefecture (72) Inventor Tomoko Tsujikawa 2-3-7 Gojo 2-chome, Nara City, Nara Prefecture

Claims (9)

[Claims] 1. A surface of at least one skin of a clad material composed of a composite aluminum foil in which one or both surfaces of an aluminum alloy core material are coated with a pure aluminum skin material comprising aluminum and unavoidable impurities is represented by the following general formula ( I) or (II) And a film-forming resin (a) comprising a copolymer having a repeating unit represented by the following general formula (III): A water-soluble solid lubricant for drilling a printed wiring board containing a lubricity-imparting agent represented by (b) is applied and baked to form a film-forming resin (a) in the water-soluble solid lubricant and lubricity. A patching plate for a printed wiring board, comprising a film formed by reacting with a imparting agent (b). 2. The film-forming resin (A) in the water-soluble solid lubricant has an average molecular weight of 200,000 to 2,000,000.
2. The backing plate according to claim 1, wherein the number is 00. 3. A polyoxyethylene group (-(CH ₂ CH ₂ O) _{w of} a lubricity imparting agent (b) in the water-soluble solid lubricant.
The patch according to claim 1 or 2, wherein the average molecular weight of the portion (-) is 2,000 to 10,000. 4. The compounding ratio of the film-forming resin (a) and the lubricity-imparting agent (b) in the water-soluble solid lubricant is 100: 20 to 200 in terms of solid content in terms of weight ratio. 4. The backing plate for punching a printed wiring board according to claim 1, 2 or 3. 5. The method according to claim 1, wherein the hydrogen ion concentration of the film-forming resin (a) and the lubricity-imparting agent (b) in the water-soluble solid lubricant is 4 to 9, respectively. A patch for punching a printed wiring board according to any one of the above. 6. The core material of the clad material has Mn of 0.3.
-1.5% by weight, and the balance consisting of aluminum and unavoidable impurities; 0.3-1.5% by weight of Mn and 0.1-1.3% by weight of Mg;
And the balance consisting of aluminum and inevitable impurities, containing 0.3 to 1.5% by weight of Mn, 0.1 to 1.3% by weight of Mg, and 0.05 to 0.05% of Cu.
The aluminum alloy according to any one of claims 1 to 5, wherein the aluminum alloy contains 0.25% by weight, and the balance is aluminum alloy selected from aluminum and unavoidable impurities. Patch plate for drilling printed wiring boards. 7. The hole of a printed wiring board according to claim 1, wherein the thickness of the coating made of a water-soluble solid lubricant for drilling the printed wiring board is 1 to 100 μm. Drilling patch. 8. The core material of the clad material has a thickness of 50 to 3
8. The backing plate for punching a printed wiring board according to claim 1, wherein the thickness of the skin material is 5 to 50 [mu] m. 9. The printed wiring board according to claim 1, wherein a drilled hole for front and back conduction is formed in the laminate in which the metal foil is adhered to the insulator, and one or both surfaces of the laminate are drilled. A method for boring a printed wiring board, wherein a punching plate is arranged.