US 2011/0218265 A1 · POLYIMIDE FOAM AND METHOD FOR PRODUCING SAME

Abstract

Disclosed is a polyimide foam made of an aromatic polyimide composed of a tetracarboxylic acid component, which is composed of 0 to 90% by mole of a 3,3′,4,4′-biphenyltetracarboxylic acid component and 100 to 10% by mole of a 3,3′,4,4′-benzophenone tetracarboxylic acid component and/or a 2,3,3′,4′-biphenyltetracarboxylic acid component, and a diamine component, which is composed of 50 to 97% by mole of m-phenylenediamine and 50 to 3% by mole of 4,4′-methylenedianiline. The polyimide foam can be produced easily, has uniform and fine cells, and has the mechanical properties required for practical use as a foam, such as flexibility that prevents the foam from cracking easily even when deformed and excellent cushioning properties, as well as heat resistance that can resist use at high temperatures.

Claims14

Dependent claims

A polyimide foam made of an aromatic polyimide having a repeating unit represented by chemical formula (1) shown below:

wherein, 0 to 90% by mole of A in the chemical formula (1) is a tetravalent unit based on a biphenyltetracarboxylic acid structure represented by chemical formula (2) shown below, and 100 to 10% by mole of A is a tetravalent unit based on a benzophenone tetracarboxylic acid structure represented by chemical formula (3) shown below and/or a tetravalent unit based on a biphenyltetracarboxylic acid structure represented by chemical formula (4) shown below:
and 50 to 97% by mole of B in the chemical formula (1) is a divalent unit based on a m-phenylene structure represented by chemical formula (5) shown below, and 50 to 3% by mole of B is a divalent unit based on a diphenylmethane structure represented by chemical formula (6) shown below.

Dependencies are inferred from the claim text.

Polyimide foam and method for producing same

Life of this patent

Polyimide foam and method for producing same

Life of this patent

Abstract

Claims14