# US 12,759,244 B2 · Method for manufacturing joined body

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- Number: US 12,759,244 B2
- Document ID: US12759244B2
- Status: Granted
- Kind: B2
- Application number: 18/578,636
- Filed: 2022-12-21
- Published: 2024-09-19
- Granted: 2026-10-13
- Earliest claimed: 2021-12-27
- Assignees: Resonac Corporation
- Applicants: Resonac Corporation
- Inventors: Nobuyuki Takahashi; Masatoshi Mori
- Web page: https://patentgrep.com/patent/US12759244B2

## CPC

- B29C 65/44: Joining a heated non plastics element to a plastics element
- B29C 65/3456: {being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates}
- B29C 65/3468: {characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings (B29C65/3668 takes precedence)}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

Provided is a method for producing a joined body obtained by joining a base material A, a film containing an amorphous thermoplastic resin, which is at least one of a thermoplastic epoxy resin and a phenoxy resin, as a main component, and a resin B in this order. The method includes a first joining step of joining the base material A and the film by melting and then solidifying the film in a state in which the film is in contact with the base material A, and a second joining step of joining the base material A and the resin B by melting and then solidifying the film in a state in which the film joined to the base material A is in contact with the resin B. The base material A is at least one of a metal and an inorganic substance, an epoxy equivalent of the amorphous thermoplastic resin is 1,600 g/eq. or more, or the amorphous thermoplastic resin does not contain an epoxy group, and a heat of fusion of the amorphous thermoplastic resin is 15 J/g or less.

## Claims

### Claim 1

A method for producing a joined body obtained by joining a base material A, a film containing an amorphous thermoplastic resin, which is at least one of a thermoplastic epoxy resin and a phenoxy resin, as a main component, and a resin B in this order,
the method comprising:
a first joining step of joining the base material A and the film by melting and then solidifying the film in a state in which the film is in contact with the base material A; and
a second joining step of joining the base material A and the resin B by melting and then solidifying the film in a state in which the film joined to the base material A is in contact with the resin B, wherein
the base material A is at least one of a metal and an inorganic substance,
the film is obtained by a method in which a solvent is added to a resin composition, the composition is applied to a release film, cured and dried, and the release film is released to obtain the film, and
an epoxy equivalent of the amorphous thermoplastic resin is 1,600 g/eq. or more, or the amorphous thermoplastic resin does not contain an epoxy group, and a heat of fusion of the amorphous thermoplastic resin is 15 J/g or less.

### Claim 2 (depends on 1)

The method for producing a joined body according to claim 1, wherein the resin B is made of a thermoplastic resin.

### Claim 3 (depends on 1)

The method for producing a joined body according to claim 1, wherein the base material A is made of a metal.

### Claim 4 (depends on 1)

The method for producing a joined body according to claim 1, wherein in the first joining step, the film is heated to 100° C. to 300° C. to be melted and then solidified.

### Claim 5 (depends on 1)

The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified by at least one selected from the group consisting of contact heating, warm air heating, hot press, infrared heating, hot plate welding, ultrasonic welding, vibration welding, and high-frequency induction welding.

### Claim 6 (depends on 1)

The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified by heating at a temperature equal to or higher than a melting point of at least one of the resin B or the film.

### Claim 7 (depends on 1)

The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified at a heating temperature of 100° C. to 400° C. under a pressure of 0.01 to 20 MPa.