US 7,078,477 B2Granted

Process for producing solvent-soluble polyimide

AssigneeMitsubishi Gas Chemical Company, Inc.

InventorsHiroki Oguro, Shuta Kihara, Tsuyoshi Bito

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Abstract

In the process of the present invention, a solvent-soluble polyimide is produced by polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in the presence of a tertiary amine. The tetracarboxylic acid component is selected from the group consisting of tetracarboxylic dianhydrides represented by the following formula 1: wherein R is as defined in the specification, and tetracarboxylic acids and their derivatives represented by the following formula 2: wherein R and Y1 to Y4 are as defined in the specification. Unlike the conventional techniques using an excessively large amount of a chemical imidation agent such as acetic anhydride and a chemical imidation catalyst such as triethylamine, in the process of the present invention, the solvent-soluble polyimide having a high polymerization degree is easily produced in a solvent with good productivity by using only a catalytic amount of the tertiary amine.

Claims15

Dependent claims

A process for producing a solvent-soluble polyimide, comprising a step of polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in the presence of a tertiary amine as a catalyst and being in addition to the solvent, said step of polycondensing being performed with a reaction mixture consisting essentially of said at least one tetracarboxylic acid component, said at least one diamine component, said solvent and said tertiary amine,

said at least one tetracarboxylic acid component being selected from the group consisting of tetracarboxylic dianhydrides represented by the following formula 1:
wherein R is a tetravalent group derived from a C2 to C12 compound that is selected from the group consisting of straight-chain hydrocarbons, branched hydrocarbons, alicyclic hydrocarbons, bialicyclic hydrocarbons, and spiro compounds optionally having oxygen constituting a spiro ring, and tetracarboxylic acids and their derivatives represented by the following formula 2:
wherein R is the same as defined in the formula 1 and Y4 to V4 are the same or different and each independently hydrogen or a C1 to C8 hydrocarbon group.

Dependencies are inferred from the claim text.

Facts

Application: 10/875,230Filed 25 Jun 2004
Priority: JP 2003/18214826 Jun 2003
Published: US 2004/0266979 A130 Dec 2004
Granted: 18 Jul 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

C08G 73/1028
From tetracarboxylic acids or derivatives and diamines: characterised by the process itself, e.g. steps, continuous
C08G 73/1032
Characterised by the process itself, e.g. steps, continuous: characterised by the solvent used
C08G
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds

Family

US 2004/0266979 A1Pre-grant publication · published 30 Dec 2004
US 7,078,477 B2This patent

From the US filing history. Foreign family members aren’t listed.

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