JPS60236728A - Manufacture of electric laminate plate - Google Patents

Abstract

PURPOSE:To obtain the titled laminate plate excellent in the thickness accuracy, the adhesivity of a metal foil, high frequency characteristic and the like with a better moldability by using a thermoplastic resin sheet with a specified water content to be a substrate for a laminate plate as such. CONSTITUTION:A plurality of thermoplastic resin sheets (preferably made of polyeter imide resin) each with the premolding water content of 0.3% or less are laminated one upon another and after a metal foil such as copper foil is piled on the outermost surface of the sheets thus laminated, they are thermopressure molded monolithically to obtain the desired laminate plate. The adjustment of the water content of the thermoplastic resin sheet may be done by heat aging. The thickness of the thermoplastic resin sheet is generally 10mum-3mm. and that of the metal foil preferably 18-70mum.

Description

[Detailed Description of the Invention] Technical Field 1 The present invention relates to a method for manufacturing an electrical product JvJi used as a printed wiring board or the like.

[Background Art 1] Electrical laminates having a substrate made of laminated sheets of thermoplastic resin are often used for applications such as flexible print 1 wiring boards, for example. This electrical laminate is made by stacking the required number of thermoplastic 48 resin sheets, wrapping metal foil such as copper foil over the outermost two sides or the bottom 1F11 or the screen, and heating and pressing them together to integrate them. By doing so, you can get 1:1. Problems with this product include plate thickness accuracy, adhesion between the thermoplastic resin sheet and the substrate, high frequency characteristics, heat resistance, and the occurrence of scratches and voids during molding. Therefore, the present inventors investigated various causes of these problems, and found that these were thermoplastic (3(
We have come to believe that this is because the moisture content of the fat sheet is high before being subjected to molding. In other words, the moisture content of the thermoplastic resin sheets used in the production of this type of electrical +r+ waste handling is all 0.5% or more, and this moisture content is not the cause of the problem mentioned above. This is something that can be considered.

1 Objective of the Invention 1 The present invention has been made in view of the following points. The object of the present invention is to provide a method for manufacturing an electrical laminate with excellent moldability.

[Disclosure 1 of the Invention] However, the method for manufacturing an electrical laminate according to the present invention involves stacking a plurality of sheets of thermoplastic resin, overlaying a metal foil on the outermost surface of the sheets, and molding them under heat and pressure to form an integral piece. In manufacturing electrical laminates by
It is characterized by using a thermoplastic resin sheet with a moisture content of 0.3% or less before molding, and achieves the purpose listed in L by using a thermoplastic resin sheet with a moisture content of 0.3% or less. The present invention will be described in detail below.

As the thermoplastic resin sheet that becomes the substrate of the laminate, polyetherimide resin sheets (including films) are mainly used, but other materials such as polysal 7T, polyethersal 7an, polyphenylene sulfan, polyphenylene oxide, polyolefin, etc. sheets can be used.

In the present invention, this heat-aging resin sheet is heated to determine its moisture content ().

It has a special feature that it should be used at 3% or less. Here, the moisture content is expressed as a percentage of the amount of water contained in the absolute dry state.For example, a thermoplastic resin sheet has a thickness of 10μ~; In the case of Ultem (manufactured by Ultem), it becomes completely dry by aging at 190°C for 2 hours.Moreover, the moisture content of the thermoplastic resin sheet must be below 0°3% IJ. If it is larger than this, the object of the present invention cannot be fully achieved.The thickness of the thermoplastic resin sheet is 10 μm.
~3.0 mm is common.

Then, the required number of thermoplastic resin sheets are stacked, and then a metal foil such as copper foil is stacked on the outermost top or bottom surface or both sides of the stacked thermoplastic resin sheets, and this is introduced into a lamination molding machine and heated. By performing pressure forming,
An electrical laminate can be obtained by laminating and integrating a thermoplastic resin sheet and a metal foil. Here, the metal foil preferably has a thickness of 18 = 7 (lμ). Note that a laminated board for multilayer printed wiring can also be created by a similar operation.

Next, the present invention will be specifically explained using examples.

Shakuwan example - 1 - A polyetherimide resin sheet (manufactured by Engineer Plastics Co., Ltd., trade name: Ultem) with a thickness of 1.2 mm is
After aging treatment by heating at °C for 60 minutes, the moisture content was measured and found to be 0.1%. This resin sheet 1 was immediately subjected to molding. That is, 8 of these resin sheets are stacked, and the outermost surface and bottom surface have a thickness of Q, 035 +
Loaded with 1 nm adhesive copper foil, this was 20Kg/c.
+n', 250°C, and f'+0 minutes of heat and pressure to form a copper foil-clad laminate.

45 polyetherimide resin sheets in Song 1st Prefecture ζ Examples]
+1 '(:) After heating for 6 () minutes and aging treatment, the moisture content was measured () and found to be 2%.
Using this resin sheet, a copper foil-clad laminate was made in the same manner as in Example 1! It was.

The moisture content of the polyetherimide resin sheet in Example 1 was measured and found to be 0.7%.

A copper foil-clad laminate was imidated in the same manner as in Example 1 without aging this resin sheet.

For the laminates of Examples 1 and 2 and Comparative Example obtained in the above 3L process, moldability, plate thickness accuracy, dielectric constant, dielectric loss tangent, and peel strength from copper foil were observed and measured. , the results are shown in the table below.3. Formability is determined by observing whether scratches or voids occur in the laminate.J: Rio 52 is not present, and the accuracy of the plate 1'f is the product/F! This was done by measuring the minimum and maximum root thickness, and in the following table, after treatment is 2;
It shows that the measurement was taken after treatment of immersion in water of C for 2/1 hour.

The former's threads, '1' and 'round Examples 1 and 2, not only reduce the occurrence of fading and voids, but also improve the dryness. -, it is possible to reduce the variation in the plate thickness and improve the plate thickness accuracy, and it is possible to decrease the dielectric constant and dielectric loss tangent to improve the high frequency Vj property.
It is confirmed that the adhesion to the copper foil can be improved.

1 Consequences of the invention 1 As mentioned above, in the present invention, the thermoplastic resin sheet used has a moisture content of Oo: This is expected to be due to the small amount of moisture in the laminate, which reduces the occurrence of scratches and voids, making it possible to manufacture laminates with good formability, as well as improving the thickness accuracy of the laminate, high frequency characteristics, and tightness with metal foil. This can improve the λ'r property.

Agent Patent Attorney Ishikawa J (7)

Claims (2)

[Claims] (1) Layering multiple sheets of heat + i (plastic fl: tH resin), attaching metal foil to the outermost surface of these sheets, and molding them under heat and pressure to integrate them together to create an electrical laminate. A method for manufacturing an electrical laminate, characterized in that the thermoplastic resin sheet 1 has a water content of 0.3% or less before molding. (2) The method for manufacturing an electrical laminate according to claim 1, wherein the thermoplastic resin sheet is a polyetherimide resin.