JPH0752317A - Laminate - Google Patents

Abstract

PURPOSE:To reduce warping twist of a laminate for which woven glass fabric is used by a method wherein the woven glass fabric of a woven texture in which one warp and at least two wefts sink and float simultaneously is taken as a base material, and the laminate wherein at least two sheets of woven glass fabric are used, is used. CONSTITUTION:A woven glass fabric having a woven structure wherein a plain weave structure is taken as a base, and a plurality of wefts sink and float simultaneously, is used as a base material. The number of wefts which sink and float simultaneously is at least two wefts, and preferably at most five wefts. When especially productivity is considered, two wefts are preferable. Further, in the case of at least six wefts, maintaining a woven texture becomes difficult. Furthermore, for a yarn count of a thread used as the warp and a yarn count of a thread used as the weft, a ratio in the yarn count between the warp and the weft (yarn count of the warp/yarn count of the weft) is preferably 1 to 4. Further, (yarn count of warp X woven density of warp)/(yarn count of weft X woven density of weft) being 0.5 to 2 is preferable from standpoints of dimensional stability and mechanical strength of a printed wiring substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated board for a printed circuit board used in the fields of electronics and electricity.

[0002]

2. Description of the Related Art Printed circuit boards are manufactured in various types depending on the types of constituent materials. Among them, a laminated board using a part or all of a glass fiber fabric is dimensional stable and mechanically. Widely used due to its excellent characteristics such as characteristics, electrical characteristics and heat resistance. Recently, a printed circuit board using a glass fiber woven fabric has come to be used for consumer applications, and a board having various configurations has been manufactured more than ever. The glass fiber fabrics used for printed wiring boards are originally specified in MIL standards, JIS standards, etc., but at the same time as diversification of printed wiring boards, glass fiber fabrics also have various thicknesses, fabric weights, and are inexpensive. Textiles are becoming more demanding. Also, with the spread to consumer applications, the mounting method of parts is surface mounting,
With the shift to automatic mounting, there is an increasing demand for reduction of warp twist in laminated boards for printed circuit boards.

Generally, as a method of reducing warp twist of a laminated plate using a glass fiber woven fabric substrate, a woven fabric in which the twist directions of the yarns are appropriately combined (Practical Report Sho 63-3606).
0, JP-A-63-159042, JP-A-3-4774.
6), a woven fabric in which the number of twists of the yarn is reduced (JP-A-63-30)
6030), and a woven fabric (JP-A-4-274381) in which the twist number of the yarn and the woven fabric density are appropriately combined have been devised.
However, it is not enough to eliminate the warp of the laminated plate, and the problem has not been solved yet.

[0004]

DISCLOSURE OF THE INVENTION As described above, the present invention has improved the glass fiber woven fabric as the base material and used the glass fiber woven fabric in response to the demand for reducing the warp twist of the printed circuit board. The purpose is to reduce warpage twist of the laminate.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted extensive studies, and as a result, by imparting characteristics to the glass fiber woven fabric as a base material, the same single yarn diameter,
The present inventors have found that the cross-sectional shape of the constituent yarns changes even with the number of single yarns, and have found a woven structure capable of improving the rigidity of the woven fabric. Further, it has been found that this makes it possible to reduce the warp twist of a laminate using the glass fiber woven substrate. That is, the present invention is a laminated plate comprising one warp yarn and at least one or more glass fiber woven fabrics having a weaving structure in which two or more weft yarns float at the same time as a base material.

A feature of the present invention is that, as shown in FIG. 1, a glass fiber woven fabric having a woven fabric structure in which a plain weave structure is basic and a plurality of weft threads are simultaneously floated and set is used as a base material. The number of weft threads that float at the same time is 2 or more, preferably 5 or less, and is preferably 2 in view of productivity. On the other hand, when the number is 6 or more, it becomes difficult to maintain the woven structure. Also,
The yarn count used for the warp yarn and the yarn count used for the weft yarn is the ratio of the warp yarn count and the weft yarn count (warp yarn count /
Weft yarn count) is preferably 1 or more and 4 or less, and (warp yarn count x warp yarn weave density) / (weft yarn count x weft density) is 0.5 or more, 2 The following is preferable in terms of dimensional stability and mechanical strength of the printed wiring board. As a method of driving the weft threads, there are a method of driving a plurality of weft threads at the same time, and a method of driving a plurality of weft threads one by one in a state where the warp threads are open, but any method may be used.

The yarn used in the glass fiber woven fabric used in the present invention is not particularly limited as long as it is a long glass fiber.
For example, the count range is 5 to 300 Tex, preferably 20.
It is up to 140 Tex, and no particular limitation is required on the shape, thickness, material, etc. of the single yarn constituting the yarn. The number of twists of the yarn is preferably 3 times / 25 mm or less. As the material, glass such as E glass, C glass, D glass, S glass, quartz, and high dielectric constant glass is used. Also,
The specifications of the glass fiber woven fabric of the present invention are not particularly limited, and for example, the woven fabric density is 10 to 100 fibers / 25 mm, and the fabric weight is 30 to 400 g / m ² .

The glass fiber woven fabric used in the present invention is usually subjected to a high-temperature desizing treatment and then treated with a surface treatment agent such as a silane coupling agent,
It is not limited to this. It is also possible to subject the glass fiber woven fabric of the present invention to a weaving treatment. Further, wash the glass fiber fabric with water or hot water before high-temperature desizing treatment,
Alternatively, the rigidity of the glass fiber woven fabric is further improved by applying a pressure wave of a fluid such as water to the woven fabric and compressing it with a breath roll or the like. The base material of the laminated board of the present invention contains at least the glass fiber having the specific woven structure. The substrates constituting the laminate are all glass fiber woven fabrics, and those containing a glass fiber woven fabric of the above woven structure, or a substrate obtained by laminating a glass fiber woven fabric of the above woven structure on both sides of a nonwoven fabric, This is the preferred embodiment.

The above-mentioned glass fiber woven fabric can be used to prepare the laminated sheet of the present invention by a conventional method. For example, a glass woven fiber material is impregnated with a matrix resin such as an epoxy resin to obtain a resin-impregnated prepreg. Is prepared, and a plurality of these are laminated and heated and pressed to obtain. When a woven fabric and a non-woven fabric are used together as the base material, the object of the present invention can be achieved by using the above-mentioned woven fabric for the surface layer. The resin used in the present invention is not particularly limited as long as it is a resin used for a laminate of glass fiber base materials, for example, epoxy resin, unsaturated polyester resin, polyimide resin, bismaleimide triazine resin, cyanate resin Any of thermosetting resins such as and the like, thermoplastic resins such as polyphenylene oxide resin, polyetherimide resin, and fluororesin, or a mixed resin thereof can be used. Further, a resin in which an inorganic filler such as aluminum hydroxide is mixed in the resin may be used.

Hereinafter, the concrete constitution of the present invention will be described with reference to examples. The warp twist amount in the examples was measured by measuring l ₁ to l ₄ as shown in FIG. 2 for a laminated plate having a gauge length of 1 as shown in FIG.

[0011]

[Equation 1]

[0012]

【Example】

Example 1 ECG75 1/0 (count 68.5Tex) was used for the warp yarn and ECG75 1/0 (count 68.5T) for the weft yarn.
ex), 44 warp threads / 25 mm, weft thread 44
Weave density of 25 threads / 25 mm, and fabric weight of 24 weft threads at the same time.
A glass fiber woven fabric having a weight of ² g / m ² and an average thickness of 0.23 mm was woven. The rigidity of the glass fiber fabric is the height in the Z-axis direction (lifting height) measured by a three-dimensional measuring machine when a glass fiber fabric of a predetermined sample size (vertical yarn direction 15 cm, weft yarn direction 5 cm) is placed on a horizontal plane. It was evaluated by The measurement results are shown in Table 1. This glass fiber woven fabric was impregnated with an epoxy resin and dried to obtain a prepreg. Eight pieces of this prepreg and copper foil with a thickness of 35 μm were stacked on the upper and lower surfaces, and heated and pressed at 175 ° C. and 40 kg / cm ² to form 3
A 40 mm square laminated plate was obtained. This laminated plate was etched to remove the copper foil, dried at 130 ° C. for 15 minutes, and then heat-treated at 170 ° C. for 30 minutes, and the warp twist amount was measured as shown in FIG. The measurement results are shown in Table 1.

Example 2 ECG75 1/0 (count 68.5 Tex) was used for the warp yarn and ECG75 1/0 (count 68.5 T) for the weft yarn.
ex), vertical warp thread 44 / 25mm, weft thread 34
A glass fiber woven fabric having a fabric weight of 214 g / m ² and an average thickness of 0.21 mm was woven using an air jet loom with a woven fabric structure in which ^two wefts were floated and settled simultaneously at a weave density of 25/25 mm. Thereafter, the rigidity of the woven fabric was measured in the same manner as in Example 1, a laminated plate was prepared, and the warp twist amount was measured. The measurement results are shown in Table 1.

Example 3 The glass fiber woven fabric prepared in Example 2 was impregnated with an epoxy resin and dried to obtain a prepreg A. Further weight 50g
/ M ² of glass fiber non-woven fabric was impregnated with an epoxy resin containing 50 parts of aluminum hydroxide as an inorganic filler and dried to obtain a prepreg B. Four prepregs B and one prepreg A were stacked on the upper and lower surfaces, 35 μm copper foil was further stacked on the upper and lower surfaces, and heat and pressure were applied at 175 ° C. and 40 kg / cm ² to obtain a 340 mm square laminated plate. This laminated plate was etched to remove the copper foil, dried at 130 ° C. for 15 minutes, and then heat-treated at 170 ° C. for 30 minutes, and the warp twist amount was measured as shown in FIG. The measurement results are shown in Table 1.

Comparative Example 1 ECG75 1/0 (count 68.5 Tex) was used for the warp yarn, and ECG75 1/0 (count 68.5 T) for the weft yarn.
ex), vertical warp thread 44 / 25mm, weft thread 34
A glass fiber woven fabric having a fabric weight of 214 g / m ² and an average thickness of 0.21 mm was woven using an air jet loom with a plain weave fabric structure at a woven density of 25/25 mm. Thereafter, the rigidity of the woven fabric was measured in the same manner as in Example 1, a laminated plate was prepared, and the warp twist amount was measured. The measurement results are shown in Table 1.

Comparative Example 2 ECG75 1/0 (count 68.5 Tex) was used for the warp yarn and ECG75 1/0 (count 68.5 T) for the weft yarn.
ex), vertical warp thread 44 / 25mm, weft thread 34
A glass fiber woven fabric having a fabric weight of 214 g / m ² and an average thickness of 0.21 mm was woven using an air jet loom with a plain weave fabric structure at a woven density of 25/25 mm. Hereinafter, a laminated plate was prepared in the same manner as in Example 3 and the amount of warpage was measured. The measurement results are shown in Table 1.

[0017]

[Table 1]

[0018]

EFFECT OF THE INVENTION Since the laminated sheet of the present invention has two or more weft yarns of the glass fiber woven fabric used at the same time, the woven fabric has high rigidity. Therefore, the warp twist of the laminate using the woven fabric is improved.

[Brief description of drawings]

FIG. 1 is a structural diagram showing an example of a woven structure of a glass fiber woven fabric of the present invention.

FIG. 2 shows a warpage model of a laminated plate.

FIG. 3 shows measurement points of warpage twist.

Claims (3)

[Claims] 1. A laminate comprising at least one glass fiber woven fabric having a woven structure in which two or more weft yarns are simultaneously floated and set with respect to one warp yarn as a base material. 2. The laminated plate according to claim 1, wherein all the base materials constituting the laminated plate are glass fiber woven fabrics. 3. A laminate comprising a nonwoven fabric and the glass fiber woven fabric according to claim 1 on both sides of the nonwoven fabric as a substrate constituting the laminate.