Polyimide resin composition

Patent metadata

Field	Value
Publication number	US-12371532-B2
Application number	US-202017435176-A
Country	US
Kind code	B2
Filing date	Feb 13, 2020
Priority date	Mar 7, 2019
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A polyimide resin composition containing a polyimide resin (A) and a nanocarbon material (B), wherein the polyimide resin (A) contains a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), and a content ratio of the repeating structural unit of the formula (1) with respect to the total of the repeating structural unit of the formula (1) and the repeating structural unit of the formula (2) is 20 to 70 mol %: wherein R 1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R 2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X 1 and X 2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic group.

First claim

The invention claimed is:

1. A thermoplastic polyimide resin composition, comprising:
a polyimide resin (A); and
a nanocarbon material (B) comprising graphene and included at a content of from 0.5 to 3 mass % based on a total mass of the polyimide resin composition,
wherein the polyimide resin (A) comprises a repeating structural unit of the following formula (1) and a repeating structural unit of the following formula (2),

wherein R 1 represents a divalent group of the formula (R1-3),
R 2 is at least one selected from the group consisting of an octamethylene group and a decamethylene group,
X 1 and X 2 each represents a tetravalent group of the formula (X-5),

a content ratio of the repeating structural unit of the formula (1) with respect to a total of the repeating structural unit of the formula (1) and the repeating structural unit of the formula (2) is from 20 mol % to less than 40 mol %,
the polyimide resin (A) is a thermoplastic polyimide resin,
the polyimide resin (A) has a weight average molecular weight (Mw) of from 15,000 to 100,000,
the graphene comprises at least one selected from the group consisting of a single-layered structure, a 2 to 9-layered structure, and a 10 to 25-layered structure,
the graphene has a thickness of from 0.1 to 100 nm,
the graphene has a specific surface area of from 50 m2/g to 800 m2/g, and

a total content of the polyimide resin (A) and the nanocarbon material (B) in the thermoplastic polyimide resin composition is at least 70 mass %.

2. The polyimide resin composition of claim 1 , wherein the graphene comprises from 3 to 40 atomic weight % of oxygen based on a total atomic weight of the graphene.

3. A molded article, comprising:
the polyimide resin composition of claim 1 .

4. The polyimide resin composition of claim 1 , wherein a total content of the polyimide resin (A) and the nanocarbon material (B) in the polyimide resin composition is at least 80 mass %.

5. The polyimide resin composition of claim 1 , the graphene comprises a single-layered structure.

6. The polyimide resin composition of claim 4 , the graphene comprises a single-layered structure.

7. The polyimide resin composition of claim 1 , wherein the graphene has the thickness of from 0.1 to 10 nm.

8. The polyimide resin composition of claim 1 , wherein the graphene has the specific surface area of from 200 m2/g to 600 m2/g.

9. The polyimide resin composition of claim 1 , having a lightness L value of less than 20 measured by a colorimeter.

10. The polyimide resin composition of claim 1 , wherein the graphene has a single-layered structure.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Sakai Atsushi
• Sato Yuuki

Classifications

• C08K3/042 Primary

  Graphene or derivatives, e.g. graphene oxides · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08G73/1042 Primary

  Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds · CPC title

• C08L79/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08K3/041

  Carbon nanotubes · CPC title