# US 2026/0307371 A1 · Insulating sheet

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- Number: US 2026/0307371 A1
- Document ID: US20260307371A1
- Status: Published application
- Kind: A1
- Application number: 18/998,348
- Filed: 2023-07-25
- Published: 2026-10-08
- Earliest claimed: 2022-08-08
- Assignees: Nitto Shinko Corporation
- Applicants: Nitto Shinko Corporation
- Inventors: Jun Fujiki; Takeshi Yamaguchi; Risako Tokunaga
- Web page: https://patentgrep.com/patent/US20260307371A1

## CPC

- B32B 27/10: of paper or cardboard
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/36: comprising polyesters
- B32B 29/00: Layered products comprising {a layer of} paper or cardboard
- B32B 2262/0269: Aromatic polyamide fibres
- B32B 2307/206: Insulating
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

An insulating sheet according to the present invention includes: an adhesive layer; and an insulating paper sheet laminated on one surface of the adhesive layer to form an outermost layer, in which the insulating paper sheet is made of fully aromatic polyamide paper including fully aromatic polyamide fibers, the adhesive layer is made of a resin composition, and a temperature at which a mass reduction by 5 mass % of the adhesive layer is observed in thermogravimetric differential thermal analysis (TG-DTA) is 350° C. or less.

## Claims

### Claim 1

An insulating sheet comprising:
an adhesive layer; and
an insulating paper sheet laminated on one surface of the adhesive layer to form an outermost layer, wherein
the insulating paper sheet is made of fully aromatic polyamide paper comprising fully aromatic polyamide fibers,
the adhesive layer is made of a resin composition, and a temperature at which a mass reduction by 5 mass % of the adhesive layer is observed in thermogravimetric differential thermal analysis (TG-DTA) is 350° C. or less.

### Claim 2 (depends on 1)

The insulating sheet according to claim 1, wherein, when TIP represents a thickness of the insulating paper sheet and TAL represents a thickness of the adhesive layer, a ratio of the thickness TAL to the thickness Ti is 40% or more.

### Claim 3 (depends on 1)

The insulating sheet according to claim 1, further comprising a base material film on an other surface of the adhesive layer, wherein
the base material film is a polyethylene terephthalate film or a polyethylene naphthalate film.

### Claim 4 (depends on 1)

The insulating sheet according to claim 1, wherein the adhesive layer is made of an acrylic resin composition comprising an acrylic resin.

### Claim 5 (depends on 2)

The insulating sheet according to claim 2, further comprising a base material film on an other surface of the adhesive layer, wherein
the base material film is a polyethylene terephthalate film or a polyethylene naphthalate film.

### Claim 6 (depends on 2)

The insulating sheet according to claim 2, wherein the adhesive layer is made of an acrylic resin composition comprising an acrylic resin.