JP2572880B2 - Electric laminate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric laminate. More particularly, the present invention relates to a new electrical laminate that can be punched and bent.

(Prior Art) Conventionally, paper laminates and glass cloths are used as base materials for electric laminates for printed wiring boards used in electric / electronic devices, communication devices, computers, and the like. Things are known. In the case of paper base material, punching can be performed, but it is mainly used as a laminate for consumer equipment because of its relatively large hygroscopicity and low heat resistance. In the case of base materials, drilling is limited to drilling, and although it is slightly inferior in terms of processing efficiency and cost reduction effect, it has good moisture absorption and heat resistance, so it is used as a laminate for industrial equipment. Is coming.

Recently, as shown in FIG. 2, a nonwoven fabric is used as a core material (a) and a glass is used as an upper and lower layer (a) as a laminated plate utilizing the advantages of both the paper base material and the glass cloth base material. A laminated board in which a cloth base material is disposed, and a metal foil (c) is further disposed and laminated and integrated has appeared. This laminated plate has features that it can be punched as a drilling process, is excellent in processing efficiency and cost, and has good moisture absorption and heat resistance.

(Problems to be Solved by the Invention) However, in the case of the improved conventional laminated plate, although the workability and the physical characteristics thereof are good, there is a disadvantage that the hardness is large and the bending cannot be performed. This drawback was a major obstacle in continuous production.

As a laminate that can be bent, a flexible laminate composed of a laminated product of a resin film and a copper foil is known, but this has no rigidity and its use is naturally restricted.

The present invention has been made in view of the above circumstances, improves the drawbacks of conventional electrical laminates, enables punching, has excellent processing efficiency, and has good moisture absorption and heat resistance. It is an object of the present invention to provide a new laminated plate which can be bent and has a firm shape.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a vinyl ester resin-impregnated non-woven fabric disposed on upper and lower surfaces of a vinyl ester resin-impregnated glass cloth, and further, on the upper surface and / or lower surface thereof. A metal laminate is laminated and integrally molded by disposing a metal foil, the vinyl ester resin has a Tg of 60 ° C. or less, the glass cloth has a thickness of 20 to 100 μm, and the non-woven fabric is made of glass. Provided is an electric laminate characterized by being a mixed nonwoven fabric having a weight ratio of fibers to polyester fibers of 70/30 or less.

That is, as shown in FIG. 1, the present invention arranges a vinyl ester resin impregnated nonwoven fabric (2) on the upper and lower surfaces of a vinyl ester resin impregnated glass cloth (1) as a core material, and further comprises an upper surface and / or It has a structure in which a metal foil (3) is arranged on the lower surface and laminated and integrated.

As the vinyl ester resin used in the glass cloth (1) impregnated with the vinyl ester resin in the laminated board, various types can be used, and an appropriate resin having a vinyl ester bonding unit may be used alone or as a mixture. Those modified with epoxy or the like can be used. The glass transition temperature (Tg)
Is 60 ° C or less. Those exceeding 60 ° C. are not preferable for punching workability, bending workability and the like.

As the glass cloth, a thin glass cloth having a thickness of 20 to 100 μm is used. This is one of the essential conditions for further improving the bending workability in the above-mentioned laminated structure. In addition, about this glass cloth, one sheet is used as much as possible. This glass cloth is impregnated with the above-mentioned vinyl ester resin having a Tg of 60 ° C. or lower, and at this time, the vinyl ester resin for impregnation may contain aluminum hydroxide, talc, alumina, silica, calcium carbonate, if necessary. , Magnesium carbonate or the like can be added at a ratio of about 150 parts or less based on 100 parts by weight of the resin.

As the vinyl ester resin of the vinyl ester resin impregnated nonwoven fabric (2) disposed on the upper and lower surfaces of the vinyl ester resin impregnated glass cloth (1), the same vinyl ester resin having a Tg of 60 ° C. or less is used. And as the non-woven fabric, glass fiber /
It is a mixed nonwoven fabric made of a combination of polyester fibers and having a weight ratio of glass fibers to polyester fibers of 70/30 or less, and it is preferable to use one by one on the upper and lower surfaces.

For the metal foil (3), conventionally used metals or alloys such as copper, aluminum, iron, nickel, and zinc can be appropriately used, and if necessary, an adhesive layer may be provided on one surface thereof. It may be provided.

In the integrated lamination molding, the impregnated material as described above may be dried and then used for molding, or may be used in a viscous state without drying. For the lamination molding, a heat and pressure molding method using a press, a double belt, a multi-roll, or the like may be employed, or substantially no pressure and heat lamination using only the own weight of the laminate may be employed. However, the non-pressure heating lamination method is more preferable because the surface roughness becomes smaller. That is, the non-pressure continuous processing method is suitably adopted.

Needless to say, the means for forming the laminated plate of the present invention can be handled by appropriate means, including conventionally known aspects.

(Function) In the laminate of the present invention, a glass cloth having a thickness of 20 to 100 μm impregnated with a vinyl ester resin having a specific Tg condition and a nonwoven fabric having a specific weight ratio of glass fiber and polyester fiber are used. By being laminated and integrated in an arrangement relationship, it has punching workability, excellent moisture absorption and heat resistance, improved dimensional accuracy, improved surface smoothness, small deflection when mounting components, and can be bent. A laminate having excellent features is realized.

(Examples) Examples 1 to 6 Various types of vinyl ester resins were added to glass cloths of various thicknesses.
Impregnated with Tg, and glass fiber /
A mixed nonwoven fabric of polyester fiber (50/50): weight ratio, fiber length of 30 mm) impregnated with a vinyl ester resin was arranged, and copper foils were arranged on the upper and lower surfaces of the outermost layer to be integrally formed.
It was molded as a pressureless continuous method.

 The properties of the obtained laminate were evaluated.

 Table 1 shows the results.

The characteristics were also evaluated when an inorganic filler such as a flame retardant was added.

As a comparative example, a case where the Tg is high and the thickness of the glass cloth is much larger than that of the present invention is shown.

Table 1 shows that the laminate of the present invention has good dimensional accuracy, surface smoothness, punching properties, and bending properties.

(Effects of the Invention) According to the present invention, as described in detail above, a laminated plate that can be punched, has good moisture absorption heat resistance, and can be bent is realized.

 This laminated plate can also be subjected to a pressureless continuous method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a laminated plate of the present invention,
FIG. 2 is a sectional view of a conventional device. 1 ... glass cloth impregnated with vinyl ester resin 2 ... non-woven cloth impregnated with vinyl ester resin 3 ... metal foil

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Soichi Horita, 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor Tetsuro Santo 1048 Odaka Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd. (56) References JP-A-2-20341 (JP, A) JP-A-2-155726 (JP, A)

Claims (1)

(57) [Claims] 1. An electric laminated board in which vinyl ester resin impregnated non-woven fabric is disposed on the upper and lower surfaces of a vinyl ester resin impregnated glass cloth, and metal foil is disposed on the upper and / or lower surfaces thereof. The vinyl ester resin has a Tg of 60 ° C. or less, and the glass cloth has a thickness of 20 to 100 ° C.
μm, wherein the nonwoven fabric is a mixed nonwoven fabric having a weight ratio of glass fiber to polyester fiber of 70/30 or less.