JPS61240512A - Manufacture of anisotropic conducting adhesive sheet - 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 relates to a method for manufacturing an anisotropic conductive adhesive sheet, which has been frequently used in electronic watches, calculators, liquid crystal display devices, etc. in recent years.

2. Prior Art Conventionally, anisotropically conductive connectors have been made by using conductive magnetic metal powder in an elastic elastomer such as uncured silicone, or fine metal wires such as iron, chives, cobalt, etc. Anisotropically conductive elastomers (for example, JP-A-52
126794, Japanese Unexamined Patent Publication No. 125072/1983), in the case of those with an adhesive function, the particle size, particle shape, and blending amount of various metal powders can be adjusted appropriately to form thermosetting resin materials. Adhesives (e.g., Japanese Unexamined Patent Application Publication No. 5-4439) which are dispersed and exhibit anisotropic conductivity when pressed are known.

Problems to be Solved by the Invention However, although the former method allows parts to be replaced, it does not have an adhesive function, so for example, when connecting the bumps of an IC chip and external terminal electrodes, there is constant pinching. However, there was a problem in that it was difficult to perform this clamping reliably. In the latter method, although it has an adhesive function, it applies pressure during assembly to develop conductivity only in the areas necessary for connection, but it is necessary to thoroughly control the blended state. In addition, there were problems in terms of resolution of anisotropic conductivity, making it impossible to make fine-pitch electrical connections, and once connected, IC chips could not be replaced. The present invention has been made in view of the above problems, and its purpose is to provide a method for manufacturing an anisotropically conductive adhesive sheet that allows fine connections to be made with good reliability and parts to be easily replaced. It's about doing.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a method of aligning a plurality of films in which a conductive resin material is printed in stripes on a thermoplastic film having an adhesive function. It is characterized in that the layers are stacked and integrated so that the directions match, and then sliced in the layering direction on a plane perpendicular to the striped orientation direction.

Function: By the above-described method of the present invention, an anisotropically conductive adhesive sheet having fine striped width and pitch, having an adhesive function, and allowing parts to be attached and detached can be obtained.

EXAMPLES The method of the present invention will be explained in detail below with reference to the drawings. 1 to 3 are process diagrams, in which 1 is a thermoplastic film, 2 is a conductive resin material, and 3 is a block body.

In the present invention, first, as shown in the cross-sectional view in FIG. Print in a striped pattern. The purpose of printing thinly is to prevent short circuits between striped patterns between facing films when laminated and bonded in a later process.

Here, the thermoplastic film 1 with an adhesive function used in the present invention is a heat-activated double-sided adhesive film made by coating adhesive on a commercially available release paper, or a thermoplastic polyester film as a core material. The main component of the adhesive is acrylic, polyester, polyamide, etc., but the components are not particularly limited. Further, the conductive resin material 2 is not particularly limited, and for example, commercially available gold, silver, copper, nickel, lead, tin, or their alloy powders, or conductive gelaphalt, carbon powder, etc. are used as epoxy resin, A conductive paint appropriately blended with polyester resin, acrylic resin, etc. can be used. Further, the conductive paint may be either thermosetting or thermoplastic, but thermosetting is preferable for stability of conduction after adhesion, and thermoplastic is preferable for adhesion. Which one to adopt is determined based on comprehensive judgment. Next, a plurality of films having a striped pattern of the obtained conductive resin material 2 are stacked so that the orientation directions of the striped patterns match, and are laminated and bonded by a hot press method or a hot roller method, so that the striped pattern can be easily adhered. A block body 3 as shown in FIG. 2 can be obtained. In addition, when adopting heat press, if the thermoplastic film 1 does not have a polyester core material, the thickness calculated from the number of stacked sheets of the thermoplastic film 1 should be 10 to
When laminated and bonded using a spacer with a thickness reduced by 20%, the conductive resin material 2 is effectively separated in the lamination direction, and a product without short circuits can be obtained.

6A-No Also, when polyester film is used as the core material,
If lamination and adhesion are performed at a temperature below the heat deformation temperature of the polyester film, there will be no short circuit of the conductive resin material 2 even without a spacer, and lamination and adhesion can be performed more rationally. Note that the temperature, pressure, and time for lamination adhesion are determined from the relationship between the heat deformation temperature of the thermoplastic film 1 and the adhesive force, but approximately
20 KVcl and 100-160°C are suitable. The block body 3 thus obtained is then sliced in the stacking direction on a plane perpendicular to the orientation direction of the striped pattern.
An anisotropically conductive adhesive sheet as shown in FIG. 3 can be obtained.

Effects of the Invention As explained above, according to the manufacturing method of the present invention, since the anisotropic conductive sheet has a thermoplastic adhesive function, for example, a bare IC chip can be made to have a high glass value.

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[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a state in which a striped conductive resin layer is provided on a thermoplastic sheet, and FIG. 2 is a perspective view showing a block body obtained by laminating and bonding the materials shown in FIG. 1. FIG. 3 is a perspective view of an anisotropically conductive adhesive sheet obtained by slicing the sheet shown in FIG. 1... Thermoplastic film, 2... Conductive resin material, 3... Block body. Name of agent: Patent attorney Toshi Nakao, male, 1 person, 18
Kuji to Kujira

Claims (1)

[Claims] A plurality of films in which conductive resin material is printed in stripes thinner than the thickness of the thermoplastic film on a thermoplastic sheet with an adhesive function are laminated together so that the orientation directions of the stripes match. A method for producing an anisotropically conductive adhesive sheet, which comprises slicing the adhesive sheet in the stacking direction on a plane perpendicular to the striped orientation direction.