JPH07314607A - Laminated sheet - Google Patents

Abstract

PURPOSE:To improve the warpage characteristics of a metal foil clad laminated sheet wherein prepregs using glass cloth as a base material are laminated to and integrated with the outer surfaces of a prepreg using a glass nonwoven fabric as a base material by one. CONSTITUTION:In a metal foil clad laminated sheet wherein prepregs using glass cloth as a base material are laminated to and integrated with the outer surfaces of a prepreg using a glass nonwoven fabric as a base material by one, the glass cloth is characterized by that a wt. is 230-250g/m<2>, thickness is 0.18-0.22mm and the average diameter of a filament is 6-10mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated board used as a material for a printed wiring board used in electronic and electric equipment.

[0002]

2. Description of the Related Art In recent years, in order to meet the demand for lighter, thinner, shorter and smaller electronic devices, techniques for directly mounting and high-density mounting semiconductor components on a printed wiring board have been developed. with this,
Printed wiring boards on which semiconductor components are mounted are also required to have high quality.

Conventionally, a metal foil-clad laminate in which one prepreg having a glass cloth as a base material is laminated and integrated on the outside of a prepreg having a glass non-woven material as a base material, does not use a glass non-woven cloth, Compared to a laminated board that uses only glass cloth as a base material, it is superior in terms of weight reduction and punchability,
Since the substrate has low rigidity, it tends to be inferior in terms of warpage characteristics.
The improvement is desired.

This warp characteristic is such that when a semiconductor component is mounted on a printed wiring board, the solder resist is heated by heating such as drying or fusing, so that when the printed wiring board is warped, the semiconductor component is mounted. The problem of not being able to do so has arisen.

[0005]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a prepreg having a glass cloth as a base material on the outside of a prepreg having a glass non-woven material as a base material. It is to obtain a laminated plate in which the warp characteristics of the metal foil-clad laminated plate in which each one is laminated and integrated are improved.

[0006]

A laminated board according to claim 1 of the present invention has a glass cloth (3) as a base material on the outside of one or more prepregs having a glass nonwoven fabric (4) as a base material. In a metal foil-clad laminate, in which one sheet of prepreg is overlaid and the metal foil (2) is placed on the outside of one of the sheets, the glass cloth has a cloth weight of 230 to 250 g / m ² ,
The glass cloth has a thickness of 0.18 to 0.22 mm and an average filament diameter of 6 to 10 μm.

The laminated plate according to claim 2 of the present invention is
The glass cloth (3) is characterized in that the yarn weight ratio of the warp yarn and the weft yarn (diameter yarn weight / weft yarn weight) is 0.9 to 1.1.

The laminated plate according to claim 3 of the present invention is
The glass cloth (3) is a plain-woven glass cloth.

The laminated board according to claim 4 of the present invention is
The glass cloth (3) is a satin-woven glass cloth.

The present invention will be described in more detail below. The present invention uses a glass nonwoven fabric (4) as a base material and stacks one or more resin-impregnated prepregs in accordance with a desired thickness, and uses a glass cloth (3) as a base material and a resin on the outside of the stacked prepregs. One layer each of the impregnated prepregs, and then
The present invention relates to a metal foil-clad laminate having a structure as shown in FIG. 1, which is a laminated plate (1) which is laminated and integrated by arranging a metal foil (2) on the outer side thereof and which is heat-pressurized or heat-cured.

Glass cloth (3) constituting the laminate of the present invention
The base material is a glass single yarn woven fabric obtained by twisting strands, which are bundles of filaments. The glass cloth cloth base material used in the present invention has a glass cloth cloth weight of 230
˜250 g / m ² , a thickness of 0.18 to 0.22 mm, and an average filament diameter of 6 to 10 μm are preferably used, and the glass cloth has a cloth weight of 230 g / m ^2.
If the amount is less than the above, the rigidity of the formed laminated plate is deteriorated and warp is liable to occur. If the weight of the glass cloth is 250 g / m ² or more, the amount of glass strands is large, resulting in poor punching property. Further, if the thickness is less than 0.18 mm, the rigidity of the molded laminate is poor, the handleability is poor, and warpage is likely to occur. If the thickness is 0.22 mm or more, the surface roughness is poor and the punching property is poor. . Further, when the average diameter of the filament exceeds 10 μm, the glass cloth substrate is twisted due to the stress in the twisting direction of the glass single yarn, and as a result, the molded laminated plate is apt to warp and the average filament If the diameter is less than 6 μm, the converging property of the strands constituting the glass cloth base material is impaired, and the handleability of the glass cloth base material deteriorates. The type of the glass fiber is not particularly limited, and E glass, D glass, S glass, T glass and the like can be used.

Further, the glass cloth preferably has a yarn weight ratio of the warp and the weft (diameter yarn weight / weft yarn weight) of 0.9 to 1.1. When the yarn weight ratio of the warp yarn and the weft yarn is less than 0.9 to 1.1 or more, the stresses of the warp yarn and the weft yarn are different, and the glass cloth base material is twisted due to the stress.
As a result, the molded laminated plate is likely to warp.

The glass cloth is preferably a plain-woven glass cloth in which yarns of warp and weft are alternately floated and woven as shown in FIG.

Further, as shown in FIG. 3, the glass cloth has two warp yarns and weft yarns both woven up and down at the same time, and each of the warp yarn and weft yarns has three yarns.
It is preferable that the booklet is made of a satin-woven glass cloth that is floated and settled at the same time. This Nanako-woven glass cloth is a glass cloth in which a plurality of warp and weft yarns (the number of warp threads and weft threads may not be the same in some cases) are floated up and down at the same time. As compared with plain weave glass cloth, the thread waviness is smaller and it is effective in improving dimensional stability. The yarn here refers to a bundle of a fixed number of monofilaments, and there are various types such as single yarn and twin yarn depending on how they are bundled.

In the present invention, the type of the glass non-woven fabric and the resin impregnated in the glass fabric is not particularly limited,
For example, epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, polyimide resin, polyphenylene ether resin, thermosetting resin such as fluororesin or thermoplastic resin such as fluororesin, alone, as a modified product or a mixture. May be used, further, if necessary, aluminum hydroxide, clay, talc,
A filler such as silica, alumina, magnesium carbonate, calcium carbonate, a hollow body such as synthetic resin powder or glass, a curing agent, a curing accelerator, a colorant, etc. may be added and mixed for use.

In the method for producing a laminated plate according to the present invention, one or more resin-impregnated prepregs are laminated on a glass non-woven fabric as a base material according to a desired thickness, and a glass cloth is used as a base material on the outside of the laminated prepregs. A prepreg impregnated with a resin as a material is superposed on each other, and a metal foil is arranged on the outer side of the prepreg to be laminated and integrated, and the laminated plate can be obtained by heat-press molding with a molding press or the like. Further, one or more glass non-woven fabrics are laminated according to a desired thickness by continuously impregnating each of the glass non-woven fabrics and the long base material of the glass fabric and the long metal foil, and the laminated glass non-woven fabrics One piece of glass cloth is stacked on the outside and sent to a squeeze roll, and excess resin is squeezed and laminated while adjusting the thickness, and further, a metal foil is arranged on the outside.
The laminated body laminated on the outer surface of the resin-impregnated base material can be continuously fed to a curing furnace to obtain a laminated plate. When the metal foil is provided on only one side, the other side is covered with a cover sheet such as a polyester film, and is peeled off after curing. The continuously manufactured laminated plate is cut into a predetermined size, and then, if necessary, is subjected to a curing furnace again.

As the metal foil, copper, aluminum,
A metal foil of iron, nickel, zinc, or the like alone or an alloy thereof can be used.

The present invention will be described below with reference to examples and comparative examples. Of course, the present invention is not limited to the following examples.

(Examples 1 to 4 and Comparative Examples 1 to 2) 75 g
Epoxy resin varnish containing dicyandiamide as a curing agent to which aluminum hydroxide was added individually while continuously conveying three sheets of glass non-woven fabric (manufactured by Olivebest Co., Ltd.) / M ² (a component of aluminum hydroxide) The ratio of 6: 1 by weight is used to impregnate the glass non-woven fabric substrate so that the resin content (including aluminum hydroxide) is 80% by weight.
The weight, thickness, filament diameter, yarn weight ratio shown in Table 1,
Each glass cloth substrate having a kind of weave is arranged one by one, and while being continuously conveyed, an epoxy resin varnish containing dicyandiamide as a curing agent is individually used, and the resin content becomes 45% by weight. After being impregnated into the base material as described above, they are combined and further coated with an epoxy resin adhesive 1
8 μm copper foil (made by Furukawa Circuit Foil Co., Ltd.) is stacked to form a laminate, and the laminate is continuously sent to a curing furnace,
The resin is heated in a curing oven for 25 minutes to heat and cure the resin to obtain a copper clad laminate having a plate thickness of 1.6 mm and a cross-sectional view as shown in FIG. The temperature of this curing furnace has a maximum temperature of 160 ° C and a minimum temperature of 60 ° C.

The resulting copper clad laminate was evaluated for warpage characteristics and surface roughness, and the results are shown in Table 1. In addition, the amount of warpage was measured by measuring the size of the obtained copper clad laminate with size 20.
A test piece was prepared by cutting it into 0 mm × 170 mm, and the copper foil of the test piece was removed by etching the entire surface.
After heat reflow treatment at 70 ° C. for 70 seconds, each test piece was placed on a glass flat plate, the distance from the square glass flat plate of the test piece was measured, and the maximum value was obtained. Also,
Regarding the surface roughness, a surfcom manufactured by Tokyo Seimitsu Co., Ltd. was used to measure the copper foil surface of the obtained copper clad laminate, and the maximum value was obtained.

[0021]

[Table 1]

[0022]

EFFECTS OF THE INVENTION According to the laminated plate of the present invention, one or more prepregs having a glass cloth as a base are laminated on the outside of one or more prepregs having a glass non-woven fabric as a base, and one outer side of the prepreg is laminated. In the metal foil-clad laminate in which the metal foil is placed on the metal foil-clad laminate, the glass cloth has a cloth weight of 230 to 2
50 g / m ² , thickness 0.18 to 0.22 mm, and an average filament diameter of 6 to 10 μm made of glass cloth, so that the rigidity is increased, and a laminate having good warp characteristics and surface roughness can be obtained. In addition, the yarn weight ratio of the warp and weft of the glass cloth (diameter yarn weight / weft yarn weight) is 0.9.
By using a glass cloth of plain weave and satin weave in the range of 1.1 to 1.1, it is possible to obtain a laminate having good warp characteristics and surface roughness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated board according to an embodiment of the present invention.

FIG. 2 is a plan view of a plain-woven glass cloth used for producing a prepreg according to an embodiment of the present invention.

FIG. 3 is a plan view of a satin-woven glass cloth used for preparing a prepreg according to another embodiment of the present invention.

[Explanation of symbols]

 1 Laminated plate 2 Metal foil 3 Glass cloth 4 Glass non-woven fabric 11 Warp 12 Weft

Claims (4)

[Claims] 1. One or more prepregs based on the glass cloth (3) are stacked on the outside of one or more prepregs based on the nonwoven glass fabric (4), and a metal foil is placed on the outside of one of the prepregs. In the metal foil-clad laminate in which (2) is arranged and laminated, the glass cloth (3) has a cloth weight of 230 to 250.
A laminated plate, which is a glass cloth having a g / m ² , a thickness of 0.18 to 0.22 mm, and an average filament diameter of 6 to 10 μm. 2. The laminate according to claim 1, wherein the glass cloth (3) has a yarn weight ratio of the warp and the weft (diameter yarn weight / weft yarn weight) of 0.9 to 1.1. 3. The laminate according to claim 1, wherein the glass cloth (3) is a plain-woven glass cloth. 4. The laminated plate according to claim 1 or 2, wherein the glass cloth (3) is a satin-woven glass cloth.