JPH0263822A - Production of laminated plate - Google Patents

Abstract

PURPOSE:To produce a laminated plate capable of being formed into a fixable multiplaner shape by utilizing both polyester fiber of glass fiber nonwoven fabric blended with polyester fiber and a binder at a specified rate. CONSTITUTION:A laminated plate is produced by impregnating a base material made of glass fiber nonwoven fabric blended with polyester fiber contg. 2 - 35wt.% binder with thermosetting resin varnish, heating and pressurizing it. Polyester fiber is blended with glass fiber. When polyester fiber is regulated to 5 or below for 100 total amount of polyester fiber, glass fiber and the binder, the laminated plate is made difficult to bend and when polyester fiber is regulated to 90 or more, heat resistance is made bad. Therefore polyester fiber is regulated to 5 - 90wt.% preferably 30 - 70wt.%. Thereby sheet cutting of the base material is not caused in both a varnish impregnating stage and a drying stage. Further the laminated plate molded by using this base material can be formed into a fixable multiplanar shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a laminate and a copper-clad laminate that can be formed into a fixed multifaceted shape.

[Conventional technology]

Recently, various types of printed wiring boards have been required as electronic devices have become denser, lighter, thinner, shorter, and smaller.

In particular, printed wiring boards using hard laminates such as phenol resin laminates, epoxy resin laminates, and polyimide resin laminates,
Flexible wiring boards based on polyimide films and polyester films are often used.

[Problem to be solved by the invention]

As electronic devices become lighter, thinner, and shorter, there is a demand for printed wiring boards that can be formed into a fixed multi-sided shape. However, flexible printed wiring boards such as polyimide flexible boards cannot be bent into a fixed multi-sided shape. However, this multifaceted shape cannot be maintained.Also, as a solution to this problem, there is an example of using a nonwoven fabric made of polyester fibers and glass fibers, as shown in JP-A-59-184587. When the strength is low, the nonwoven fabric may be cut during the resin impregnation process, making it difficult to maintain the multifaceted shape after manufacturing into a printed wiring board.

In order to solve the above problems, the present invention provides a method for manufacturing a laminate that can be formed into a fixed multifaceted shape.

[Means to solve the problem]

The present invention is a method of impregnating a base material of glass fiber nonwoven fabric mixed with polyester fibers containing 2 to 35% of binder with a thermosetting resin varnish, and heating and pressurizing this to form a laminate.

Suitable binders for use in the present invention include resins such as epoxy resins, polyester resins, and acrylic ester resins, and cellulose fibers in order to facilitate bonding of glass fibers and polyester fibers.

The epoxy resin used as the binder may be a commercially available product such as bisphenol diglycidyl ether and its oligomer novolak type epoxy resin, dimer acid-modified flexible epoxy resin, or aliphatic epoxy resin.

The polyester resin used as the binder is preferably an unsaturated polyester resin, but it may be modified with an epoxy resin or the like.

The acrylic ester resin used as the binder is preferably an ester resin using an acrylic oligomer and having an unsaturated group.

As the cellulose fibers used as the binder, fibers such as wood pipes and cotton are used. There are no particular requirements regarding the length and shape of the fibers.

In the total amount of binder, polyester fiber, and glass fiber, if the binder is less than 2% by weight, it will be cut in the resin impregnation process, and if it exceeds 35% by weight, it will be difficult to handle in the base material manufacturing process, and there will be problems in molding multifaceted shapes.

The polyester fiber used in the present invention may be any ordinary polyester fiber, and is mixed with glass fiber to provide a fixed polyhedral shape. If the total amount of polyester fibers, glass fibers, and binder is 1100, if the polyester fiber is 5 or less, it will be difficult to bend, and if it is 90 or more, the heat resistance will be poor. Therefore, the amount is 5 to 90% by weight, preferably 30 to 70% by weight.

The thermosetting resin is a phenol resin, an epoxy resin, a polyimide resin, a melamine resin, or an unsaturated polyester resin, and a bromine compound, a phosphorus compound, a nitrogen compound, or a mixture thereof is added or reacted to make it flame retardant. The substrate may also be modified with a plasticizer to make it easier to bend into a multifaceted shape.

The laminate obtained by the method of the present invention is processed into a printed wiring board, and in the case of a copper-clad laminate integrally formed with a copper foil, it is manufactured by etching. Copper foil may be coated with adhesive, which has a higher adhesive strength.Also, circuits can be formed on laminated boards by electrolytic plating, electroless plating, etc., and they can be used for printed wiring boards, semiconductors, resistors, etc. The component holes are generally formed by drilling or punching.

[Effect]

In the present invention, since a glass fiber nonwoven fabric mixed with polyester fiber containing 2 to 35% by weight of binder is used, the base material is not cut in the varnish impregnation step and drying step.

Further, a laminate formed using this base material can be formed into a fixed multifaceted shape.

[Example 1] Prepreg 5 obtained by impregnating and drying an epoxy resin with a bromine content of 25% into a nonwoven fabric consisting of 10% by weight of a bisphenol-type epoxy binder with an epoxy equivalent of 250, 50% by weight of polyester fibers, and 40% by weight of glass fibers. The sheet and copper foil were combined and molded under heat and pressure to obtain a copper-clad laminate with a diameter of 0.8 Tsuru. Its characteristics are shown in Table 1.

[Example 2] Phthalic acid-based unsaturated polyester resin binder 10% by weight
, other nonwoven fabric components and treatment conditions were the same as in Example 1. The characteristics are shown in Table 1.

[Example 3] The methacrylic acid ester resin binder (10% by weight), other nonwoven fabric components, and processing conditions were the same as in Example 1.

The characteristics are shown in Table 1.

[Example 4] The wood valve cellulose fiber binder (10% by weight), other nonwoven fabric components, and processing conditions were the same as in Example 1.

The characteristics are shown in Table 1.

[Comparative example]

50% by weight polyester fiber, 50% by weight glass fiber (
14 m of fabric (without binder) with a bromine content of 2
A prepreg obtained by impregnating 5% of epoxy resin was treated under the same conditions as in Example 1 to obtain a copper-clad laminate. Its characteristics are shown in Table 1.

Table 1 Workability in the impregnation process: ○: Almost no cutting Δ: Sometimes cutting ×: Retention of cut multifaceted shape: ○ Good Δ: No arrow or maintainability The test specimen was bent 180° along a 2φ round bar placed on the bending line of the body and left at room temperature for 3 hours.

〔Effect of the invention〕

The method of the present invention has good workability in the manufacturing process, and is superior in forming multifaceted shapes and retaining them.

Claims (5)

[Claims] 1. A method for manufacturing a laminate, in which a polyester-mixed glass nonwoven fabric consisting of polyester fibers, glass fibers, and a binder is used as a base material, and the nonwoven fabric is impregnated with a predetermined amount of thermosetting resin varnish and molded, wherein the polyester fibers of the polyester-mixed glass nonwoven fabric are A method for manufacturing a laminate, characterized in that the content of the binder is 5 to 90% by weight and the binder is 2 to 35% by weight. 2. 2. The method for manufacturing a laminate according to claim 1, wherein the polyester-mixed glass nonwoven fabric contains 50% by weight of polyester fibers and 10% by weight of a bisphenol type epoxy binder having an epoxy equivalent of 250. 3. 2. The method for manufacturing a laminate according to claim 1, wherein the polyester-mixed glass nonwoven fabric contains 50% by weight of polyester fibers and 10% by weight of a phthalic acid unsaturated polyester resin binder. 4. Polyester blended glass nonwoven fabric contains 50% by weight polyester fibers and 10% methacrylic acid ester resin binder.
% by weight. 5. Polyester mixed glass nonwoven fabric contains 50% polyester fiber and wood pipe cellulose fiber binder 10% by weight.
% by weight.