JPS61203694A - Manufacture of laminate plate for aditive plating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is based on the following technology: This relates to a method for manufacturing a laminate for additive plating, the purpose of which is to form a releasable net (: a pinch margin) when the releasable sheet is transferred to the surface of the substrate and then peeled off and removed.

(Prior art) Manufacture of a laminate for additive plating (in which a rubber adhesive is coated on a releasable sheet (= coated and dried, then laminated with a thermosetting impregnated paper cloth and integrated by heating and pressing).

How to form the rubber adhesive layer on the laminate screen C.

Already known (; that is, Japanese Patent Publication No. 54-11354 (Y
-f shoulder glare), Special Publication No. 55-43273 (Hitachi Chemical)
, Japanese Patent Publication No. 57-48874 (Kolmorgen), etc., describe a method using a peelable notebook.

General (=, For drying rubber adhesive to a semi-cured state (
: requires conditions of 150 to 200°C for 5 to 20 minutes, and the peelable sheet is peeled from the laminate (: The required force is 500 to zooooII/&IL, so it is not practical ( = indicates that plastic film or paper cannot be used due to their heat resistance or mechanical strength.

Therefore, metal foil with a thickness of 20 to 60 μm is commonly used. However, the adhesiveness between the rubber adhesive and the metal foil is extremely strong and cannot be easily peeled off.

As a solution to this problem, it is known to remove the metal foil by etching, but there are problems such as the number of steps required for etching and the treatment of etching waste liquid.

A method of lowering the peel strength of a releasable sheet by incorporating a C2 release agent in a rubber adhesive is also known, but if the peel strength is too low, the sheet may be easily handled after integral molding. : It will peel off and the adhesive surface cannot be protected, causing scratches, stains, etc.

(Objective of the Invention) The present invention was completed as a result of intensive research on how to easily peel and remove a releasable sheet for additive plating laminates, which could not be easily peeled off in the past.
The object of the present invention is to provide a laminate for additive plating in which the sheet is extremely easy to peel.

(Structure of the Invention) The present invention applies a rubber adhesive onto a releasable sheet, dries it, overlaps it with a paper cloth impregnated with a thermosetting resin, and heats and presses it to integrate it.

In a method of manufacturing a laminate for additive plating,
This method of producing a laminate for additive plating is characterized in that after coating both side edges C of the releasable sheet with a releasable molding agent, a rubber adhesive is applied onto the releasable sheet. The releasable sheet used in the present invention (=
Aluminum foil with a thickness of 30 to 60 tones is preferred.

As a mold release agent, silicone mold release agent, liquid paraffin,
Waxes, phospholipid bodies and plastic films are preferred.

Preferred phospholipids include phosphatedic acid, phosphatidylcholine, phosphatidylethanolamine, and plasmalogen. As a plastic film, a film of polypropylene or polymethylpentene with a thickness of 5 to 20 μm can be used by heat-sealing it to aluminum foil.The rubber adhesive is a mixture of thermosetting resins containing synthetic rubber. Inorganic oxides and metal carbonates may be added as necessary.

As the synthetic rubber, styrene-butadiene rubber and acrylonitrile-butadiene rubber are preferred.

As the thermosetting resin, epoxy resin, phenol resin, and melamine resin are preferable.

In the rubber adhesive, a mold release agent may be added as necessary (= if necessary, and as a mold release agent, especially a phospholipid body is added,
This is preferable from the viewpoint of plating adhesion in the process.

However, when adding a mold release agent (=, in order to satisfy both the handling problems after press molding and the problem of peeling off the releasable note, the peel strength of the releasable sheet is xoo
, it is desirable that it be every 9z or more and 3001/CIL or less.

In addition, regarding the coating of both side edges of the releasable sheet, it is necessary to coat the peelable sheet within 10 to 30 m+ from the practical end. It is desirable that the coating area be within 10IIll1 from the end surface.

If the mold release agent invades the workpiece size in the subsequent process, which is 10m5+ or more from the end face, unfavorable cases may occur due to poor plating adhesion.

(Effect of the invention) The laminate for additive plating obtained by the present invention (: The attached releasable sheet does not easily peel off during handling after integral molding (=, it does not function as a protective sheet) The adhesive surface of the laminate will not be scratched or smudged.

On the other hand, easy C: Forming a pinch margin that can be peeled off (=: required (= combining with an automatic peeling machine as required) f2) The number of peeling steps can be significantly reduced.

(Example) The method for manufacturing a laminate for additive plating according to the present invention C will be explained below using Examples and Comparative Examples.

Example 1゜ 2-width of both side edges of 50 μm aluminum foil.

After applying phosphatidylethanolamine as a phospholipid, a mixture having the composition shown in Table 1 was applied as a rubber adhesive to give an adhesive thickness of 49 Hm (C) and dried. A laminate for additive plating was obtained by heating and pressing the adhesive-coated aluminum foil on both sides of eight sheets of glass cloth impregnated with epoxy resin using a twist press.

Table 1 Composition of rubber adhesive Example 2゜Example except that a 5-tone thick film of polymethylpentene was used as the mold release agent, and aluminum foil C was heat-sealed. In the same way as (d), a laminate for additive plating was made.

Comparative example-1 Aluminum foil (: Instead of applying a mold release agent (=.

In the rubber adhesive, 1: 5.0% by weight of phosphatidylethanolamine was added in terms of solid content, and the rest was as in Example 1.
．． A laminate for additive plating was obtained in the same manner as above.

Comparative Example-2 Same as Example 1 except that no mold release agent was applied to the aluminum foil. A laminate for additive plating was obtained in the same manner as above.

Comparative Example-3 Same as Example 1, except that no release agent was applied to the aluminum foil, and phosphatidylethanolamine was not added to the rubber adhesive of Example 1. In the same manner as above, a laminate for additive plating was obtained.

Example 1. -Manufacturing specifications of the laminate for additive plating obtained in Comparative Example-3 (= peel strength of aluminum foil, surface appearance of adhesive side, outside of copper circuit of printed wiring board with chemical copper plating C2) The test results are shown in Table 82.

As explained above, the laminate of the present invention maintains the protective function of the adhesive layer of the releasable sheet, and also significantly reduces the number of man-hours for peeling work by forming the tab marks of the releasable sheet. was realized possible.

Claims (1)

[Claims] In a method of manufacturing a laminate for additive plating by applying a rubber adhesive on a releasable sheet, drying it, overlapping it with a paper cloth impregnated with a thermosetting resin, and integrating it by heating and pressing, the releasable sheet is 1. A method for producing a laminate for additive plating, which comprises coating both side edges of a releasable sheet with a release agent, and then applying a rubber adhesive onto the releasable sheet.