JPH08307026A - Tabular body for wiring board and its manufacture - Google Patents

Abstract

PURPOSE: To provide a tabular body for a wiring board of excellent dielectric characteristic and a method for manufacturing the tabular body with high productivity. CONSTITUTION: A tabular body for a wiring board 11 is formed from crystalline thermoplastic resin such as syndiotactic polystyrene. The thermoplastic resin includes fiber reinforcing material such as glass fiber. In this method, a thermoplastic resin sheet 12 and glass cloth 15 are fused by a belt press method to let the fiber reinforcing material be included in the thermoplastic resin sheet 12. In the belt press method, the thermoplastic resin sheet 12 and the glass cloth 15 are put between metallic endless belts 19 which are located on both sides of the thermoplastic resin sheet 12 and the glass cloth 15 and then surface stress is applied under this condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring board plate and a method for manufacturing the same, which can be used for manufacturing a laminated wiring board or the like.

[0002]

BACKGROUND ART [0002] For example, as a material for a plate-like body (prepreg) for a printed wiring board having a laminated structure, an epoxy resin which is a thermosetting resin has been generally used conventionally. Further, a composite plate-shaped body in which glass fiber as a fiber reinforcing material is mixed in the plate-shaped body is also used. Such a composite plate-like body is manufactured by impregnating a glass cloth made of glass fibers with an epoxy resin and then thermally curing it with a multi-stage press.

However, since the conventional plate-like body for a printed wiring board is made of an epoxy resin, it has not been sufficiently satisfactory in terms of dielectric properties such as dielectric constant (ε) and dielectric loss tangent (tan δ). Further, in the case of the above-mentioned manufacturing method, the time required for the heating and pressurizing steps after impregnating the glass cloth with the epoxy resin is as long as several hours, which results in low productivity.

Therefore, an object of the present invention is to provide a wiring board plate having excellent dielectric properties and a method for producing the plate with high productivity.

[0005]

The wiring board plate according to the first aspect of the present invention is characterized by being made of a crystalline thermoplastic resin. Examples of the crystalline thermoplastic resin include aromatic polyether resins, aromatic polyether ketone resins, fluororesins, and syndiotactic polystyrene. Since the crystalline thermoplastic resin has good dielectric properties such as dielectric constant (ε) and dielectric loss tangent (tan δ), it is preferably used as a plate for wiring board.

In the wiring board plate according to the second aspect of the present invention, in the first aspect, the crystalline thermoplastic resin is
It is characterized by being syndiotactic polystyrene. Among the above-mentioned crystalline thermoplastic resins, syndiotactic polystyrene has a particularly low hygroscopicity, good electrical characteristics (low dielectric constant, low dielectric loss tangent), and high heat resistance against solder and the like. In addition, this syndiotactic polystyrene has high frequency characteristics, heat resistance, chemical resistance,
It is also excellent in rigidity.

A plate-like body for a wiring board according to a third aspect of the present invention is characterized in that, in the first or second aspect, the thermoplastic resin contains a fiber reinforcing material. The fiber reinforcement includes glass fiber, carbon fiber and the like.

A plate-like body for a wiring board according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the fiber reinforcing material is glass fiber. The glass fiber is preferably used in terms of electrical characteristics. In addition, an appropriate additive may be added to the plate-shaped body of the present invention, for example, a flame retardant additive may be added to impart flame retardancy.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a plate-like body for a wiring board, wherein a sheet-like thermoplastic resin and a sheet-like fiber reinforcing material are fused by a belt pressing method into the sheet-like thermoplastic resin. It is characterized by containing a fiber reinforcing material. The belt pressing method is a pressing method for obtaining a wide pressing surface for the planar thermoplastic resin and the planar fiber reinforcing material using a belt.

The fiber reinforcing material may be contained in the planar thermoplastic resin by impregnating the planar fiber reinforcing material with the thermoplastic resin. The sheet shape is, for example, a sheet shape having a relatively thick thickness and a film shape having a relatively thin thickness. As the sheet-like fiber reinforcing material, for example, glass cloth can be used.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, there is provided a method for manufacturing a plate-like body for a wiring board, wherein the belt pressing method is one of the planar thermoplastic resin and the planar fiber reinforcing material. The surface pressure is applied in a state where the sheet thermoplastic resin and the sheet fiber reinforcing material are sandwiched between the belt arranged on the other side and the belt or roll arranged on the other side.

That is, in the present belt pressing method, when the belts are arranged on both sides of the sheet-like thermoplastic resin and the sheet-like fiber reinforcing material, and when the sheet-like thermoplastic resin and the sheet-like fiber reinforcing material are provided, The belt may be arranged on one side and the roll may be arranged on the other side. The belt is preferably an endless belt made of metal such as stainless steel. By using such a belt pressing method, the sheet thermoplastic resin and the sheet fiber reinforcing material are pressed over a large area as compared with the case where multi-stage pressing is performed between a plurality of rolls. The defibration of the material becomes good, and a homogeneous fusion state of the thermoplastic resin and the fiber reinforcing material can be obtained.

According to a seventh aspect of the present invention, there is provided a method for producing a plate-like body for a wiring board according to the sixth aspect, wherein at least one of the roll and the belt has a heat-resistant release resin layer formed on the surface thereof. Is characterized in that. A heat-resistant release resin layer may be formed on both the roll and the belt. The heat-resistant release resin layer can be formed, for example, by coating a heat-resistant release resin or adhering a heat-resistant release resin film. By forming the heat-resistant mold-releasing resin layer in this way, it becomes possible to prevent the roll made of metal or the like from adhering to the resin-containing plate-like body and prevent the productivity from decreasing.

A method of manufacturing a wiring board plate according to an eighth aspect of the present invention is characterized in that, in the seventh aspect, the heat-resistant release resin layer is made of a polyimide resin. In addition,
After the production of the plate-shaped body, it is possible to continuously laminate a metal foil such as a copper foil onto the plate-shaped body to form a laminated structure, which makes it possible to improve the production cycle.

[0015]

【Example】

[Embodiment 1] With reference to FIG. 1, a wiring board plate 11 and a method for manufacturing the same according to Embodiment 1 of the present invention will be described. First,
The manufacturing apparatus used in the manufacturing method by the belt pressing method of this embodiment will be described. This device includes a supply section 13 for a thermoplastic resin sheet 12 which is a planar thermoplastic resin, press sections 14A and 14B for pressing the thermoplastic resin sheet 12, and a supply section for a glass cloth 15 which is a planar fiber reinforcing material. 16 and.

The supply section 13 of the thermoplastic resin sheet 12 is
It has a die 17 connected to an extruder (not shown). The press parts 14A and 14B are installed on the upper surface side and the lower surface side of the thermoplastic resin sheet 12 extruded from the die 17 along the extruding direction of the sheet 12, respectively. Each press section 14A, 14B is a pair of metal rolls 18A, 18B arranged with an appropriate interval, a metal endless belt 19 made of stainless steel or the like wound around these rolls 18A, 18B, both rolls 18
It has a pneumatic press device 21 arranged between A and 18B. The appropriate interval is an interval at which a sufficient effect of containing the fiber reinforcing material by the present belt press can be obtained.

Sheet 1 of the pair of rolls 18A, 18B
The roll 18A on the upstream side of 2 has a heating function from the outside, and the roll 18B on the downstream side of the sheet 12 has a cooling function from the inside. And the rolls 18A, 18B
A heat-resistant release resin layer (not shown) is formed on the surface of the endless belt 19 that is in contact with the sheet 12. This heat-resistant release resin layer is formed by coating with a polyimide resin. The endless belt 19 is wound between the rolls 18A and 18B while being stretched straight without slack.

The supply section 16 of the glass cloth 15 is provided corresponding to the upper and lower press sections 14A and 14B, respectively. The supply unit 16 of each glass cloth 15 includes a roll 23 around which the glass cloth 15 is wound, and a pair of heaters arranged above and below the glass cloth 15 along the feeding direction of the glass cloth 15.
24, which has a guide roll 25 arranged so as to contact one of the rolls 18A.

Next, a method of manufacturing the wiring board plate 11 using this manufacturing apparatus will be described. After the crystalline thermoplastic resin sheet 12 is continuously extruded from the die 17,
Immediately, it is inserted between the pair of upper and lower press parts 14A, 14B. The material of the crystalline thermoplastic resin sheet 12 is polystyrene having a syndiotactic structure (hereinafter, SPS).
Abbreviated). On the other hand, the supply unit 16 of the glass cloth 15
From, the heated glass cloth 15 is the press section 14A,
It is supplied to 14B and laminated on the upper and lower surfaces of the sheet 12, and the laminated sheet 12 and glass cloth 15 are pressed from the upper and lower sides by a roll 18A and the endless belt 19. On this occasion,
The air 22 of the pneumatic pressing device 21 assists the pressing by the endless belt 19. The press temperature during this press is 28
The pressing pressure is 0 to 350 ° C. and 0.098 to 2.940 MPa.

The sheet 12 pressed by the upper and lower endless belts 19 and the upper and lower glass cloths 15 are integrated so as to be fused, and then cooled by the roll 18B on the downstream side to obtain the wiring board according to the present embodiment. The plate-shaped body 11 is formed. As shown in FIG. 2, the obtained plate-like body 11 has a thermoplastic resin 26 and glass fibers 27 contained in the thermoplastic resin 26 so as to be uniformly dispersed therein. After this, or continuously with the production of the plate-like body 11, a metal foil 28 such as a copper foil is laminated on the plate-like body 11 to produce a printed circuit board.

Since the wiring board plate 11 according to this embodiment is made of the syndiotactic polystyrene of the crystalline thermoplastic resin 26 and contains the glass fiber 27, the dielectric constant (ε), Good dielectric properties such as dielectric loss tangent (tan δ). It is also excellent in high frequency characteristics, heat resistance, chemical resistance, and rigidity.

Further, the wiring board plate 11 according to the present embodiment.
According to the manufacturing method of, since the pressing area between the sheet 12 and the glass cloth 15 is increased by the belt pressing method, the defibration of the glass cloth 15 becomes good and the thermoplastic resin
The glass fibers 27 can be dispersed homogeneously in the 26.
Further, according to the manufacturing method of the present embodiment, the roll 18A, 18
Since the B and belt 19 have a heat-resistant release resin layer formed on their surface, the rolls 18A and 18B are prevented from adhering to the thermoplastic resin sheet 12 and the plate-like body 11 to improve productivity. Can be prevented.

[Embodiment 2] A method of manufacturing the wiring board plate 11 according to Embodiment 2 of the present invention will be described with reference to FIG.
In the apparatus used in Example 1, the crystalline thermoplastic resin sheet 12 was formed by the die 17 and supplied, but in the apparatus used in this Example, the thermoplastic resin sheet 12 was It is designed to be supplied in a manufactured state.

That is, the supply section 31 of the thermoplastic resin sheet 12 of this embodiment is provided with the supply roll 32 and the sheet 12 of the thermoplastic resin sheet 12 around which the produced thermoplastic resin sheet 12 is wound.
A pair of heaters 24 are provided above and below the seat 12 along the sheet feeding direction. Other press parts 14A, 14B
The configuration of the supply unit 16 of the glass cloth 15 is similar to that of the first embodiment. However, instead of the pneumatic press device 21, a pair of rolls 18C for assisting pressing are provided above and below the sheet 12.

Plate-shaped body for wiring board using this manufacturing apparatus
The manufacturing method of 11 is the same as that of the first embodiment, and the crystalline thermoplastic resin sheet 12 fed from the supply roll 32 of the sheet 12 is heated by the heater 24 to be pressed by the pressing unit 14
Supplied to A and 14B. The pressing temperature and pressing pressure during this pressing are also the same as in Example 1.

[Embodiment 3] A method of manufacturing the wiring board plate 11 according to Embodiment 3 of the present invention will be described with reference to FIG.
In the manufacturing apparatus used in Examples 1 and 2, the sheet 12 in which the glass cloth 15 is laminated on the upper and lower surfaces was pressed from the upper and lower surfaces by the endless belt 19,
In this embodiment, the belt press is performed only on one side.

That is, the press parts 14B and 14C of this embodiment are similar to the above-mentioned embodiment with respect to the lower press part 14B, but the upper press part 14C is substantially the middle of the pair of rolls 18A and 18B. This roll 1 with one roll 18D in position
A small press assisting roll 18E is arranged on the lower surface side of the sheet 12 with which the 8D abuts. Then, in order to obtain a large pressing area for the laminated sheet 12 and the glass cloth 15, the upper roll 18D is arranged so that the endless belt 19 is in contact with the roll 18D via the sheet 12 in a curved shape. . That is, the upper roll 18D is arranged at a position slightly pushed downward with respect to the endless belt 19. These rolls 18D and 18E also have a heat-resistant release resin layer formed on their surface. Other configurations of the supply unit 13 of the thermoplastic resin sheet 12 and the supply unit 16 of the glass cloth 15 are similar to those of the first embodiment, but a guide roll 25 is provided on the downstream side of the sheet 12.

Plate-shaped body for wiring board using this manufacturing apparatus
The manufacturing method of 11 is the same as that of the above-mentioned Example 1, and the thermoplastic resin sheet 12 formed by the die 17 is supplied to the press parts 14B and 14C of this example. The pressing temperature and the pressing pressure during this pressing are also the same as in Example 2. Also in this example, since the pressing area between the sheet 12 and the glass cloth 15 is increased by the belt pressing method, the defibration of the glass cloth 15 becomes good, and the glass fibers 27 are homogeneous in the thermoplastic resin 26. It can be dispersed.

[Embodiment 4] With reference to FIG. 5, a method of manufacturing the wiring board plate 11 according to Embodiment 4 of the present invention will be described.
In the apparatus used in Example 3, the thermoplastic resin sheet 12 was formed by the die 17 and supplied, but in the apparatus used in this example, the same as in the case of Example 2. The thermoplastic resin sheet 12 is supplied in a manufactured state.

That is, the supply section 31 of the thermoplastic resin sheet 12 of this embodiment is provided with the supply roll 32 of the thermoplastic resin sheet 12 and the pair of heaters 24 as in the second embodiment. The other configurations of the press units 14B and 14C and the supply unit 16 of the glass cloth 15 are the same as those in the third embodiment.

Plate-shaped body for wiring board using this manufacturing apparatus
The manufacturing method of 11 is the same as the case of the third embodiment, and the thermoplastic resin sheet 12 fed from the supply roll 32 of the sheet 12 is heated by the heater 24 to be pressed by the press sections 14B and 14C.
Is supplied to. The pressing temperature and pressing pressure during this pressing are also the same as in Example 1.

[Experimental Example] As Experimental Example 1, the wiring board plate 11 was manufactured using the apparatus of Example 3, but only one glass cloth 15 was supplied from the lower supply unit 16. Sheet
Layered on one side of 12. The SPS sheet used as the thermoplastic resin sheet 12 is Idemitsu SPS IR1020 (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.), and the glass cloth 15 is glass cloth 5150 (trade name, manufactured by Asahi Schwebel Co., Ltd.). The obtained plate-shaped body 11 has a thickness of 0.27 to 0.34 mm and a glass fiber amount of 29%. In the plate-shaped body 11 of this experimental example, the dispersion state of the glass fibers in the thermoplastic resin was good. Then, the dielectric characteristics of the plate-like body 11 were measured, and the dielectric constant (1 MHz) was 3.47 and the dielectric loss tangent (1 MHz) was 0.0027.

As Experimental Example 2, the wiring board plate 11 was manufactured using the apparatus of Example 4. The thermoplastic resin sheet 12 and the glass cloth 15 used are the same as in Experimental Example 1. The obtained plate-shaped body 11 has a thickness of 0.41 to 0.57 mm and a glass fiber amount of 48%. In the plate-shaped body 11 of this experimental example, the dispersion state of the glass fibers in the thermoplastic resin was good. Then, the dielectric characteristics of the plate-shaped body 11 were measured, and the dielectric constant (1 MHz) was 3.76 and the dielectric loss tangent (1 MHz) was 0.0023.

On the other hand, as a comparative example, an apparatus in which three first to third pressing rolls are arranged in a straight line is used, and a sheet and a glass cloth are applied to the first and second rolls and the second and third rolls. A plate-like body was manufactured by continuously inserting the plate. The thermoplastic resin sheet and the glass cloth used are the same as in Experimental Example 1. According to this comparative example, since the impregnation of the glass cloth with the thermoplastic resin was poor, a practical wiring board-like body could not be obtained.

[0035]

According to the present invention, it is possible to obtain a wiring board plate having excellent dielectric properties. Moreover, according to the manufacturing method of the present invention, the productivity of the plate-shaped body can be improved.

[Brief description of drawings]

1 is a schematic view of an apparatus used in Example 1. FIG.

2 is a cross-sectional view of a wiring board plate obtained in Example 1. FIG.

FIG. 3 is a schematic view of an apparatus used in Example 2.

FIG. 4 is a schematic view of an apparatus used in Example 3.

5 is a schematic view of an apparatus used in Example 4. FIG.

[Explanation of symbols]

 11 Plate for wiring board 12 Thermoplastic resin sheet 14A, 14B, 14C Pressed portion 15 Glass cloth 18A-18E Roll 19 Endless belt 26 Thermoplastic resin 27 Glass fiber

Claims (8)

[Claims] 1. A plate-like body for a wiring board, which is made of a crystalline thermoplastic resin. 2. The wiring board plate according to claim 1, wherein the crystalline thermoplastic resin is syndiotactic polystyrene. 3. The wiring board plate according to claim 1, wherein the thermoplastic resin contains a fiber reinforcing material. 4. The wiring board plate according to claim 1, wherein the fiber reinforcing material is glass fiber. 5. A plate-like body for a wiring board, characterized in that the sheet-like thermoplastic resin and the sheet-like fiber reinforcing material are fused by a belt pressing method to contain the fiber-reinforcing agent in the sheet-like thermoplastic resin. Manufacturing method. 6. The belt pressing method uses a belt arranged on one surface side of the surface thermoplastic resin and the surface fiber reinforcing material, and a belt or roll arranged on the other surface side. The method for producing a plate-like body for a wiring board according to claim 5, wherein the surface pressure is applied with the sheet-like thermoplastic resin and the sheet-like fiber reinforcing material sandwiched therebetween. 7. The method for manufacturing a plate-like body for a wiring board according to claim 6, wherein at least one of the roll and the belt has a heat-resistant release resin layer formed on the surface thereof. . 8. The method for manufacturing a plate-like body for a wiring board according to claim 7, wherein the heat-resistant release resin layer is made of a polyimide resin.