Acid anhydrides
AssigneeKaneka Corporation
InventorsKoji Okada, Shoji Hara, Hitoshi Nojiri
Life of this patent
Estimating the term…
Abstract
Novel polyimides substituted by a substituent having an alkyl or fluoroalkyl group and having reduced water absorption; a process for producing these novel polyimides; and novel acid dianhydrides to be used in the production thereof. A polyimide containing a structure represented by the following general formula (I): wherein X1 represents a tetravalent organic group having a substituent —R1AR2 (wherein A represents a divalent linkage group; R1 represents a single bond or a C1-3 alkylene group; and R2 represents a C1-25 alkyl group or a fluoroalkyl group); and Y represents a divalent organic group.
Claims3
An acid dianhydride having a structure represented by the following general formula (V):
- wherein:
- X1 is represented by the following general formula:
- wherein
- Z represents a divalent aromatic group having a substituent —R1AR2 (wherein A is an ester bond, an amide bond or a sulfonamide bond;
- R1 represents a single bond or a C1-3 alkylene group;
- and R2 represents a C1-25 alkyl group or a fluoroalkyl group);
- and L is —O—.
A process for producing an acid dianhydride involving the step of reacting a dihydroxybenzene derivative with an alkylating agent and trimellitic acid anhydride derivative, where said acid dianhydride contains a structural unit represented by the following general formula (V):
- wherein X1 is represented by the following general formula:
- wherein
- Z represents a divalent aromatic group having a substituent —R1AR2 (wherein A represents C1 an ester bond, an amide bond or a sulfonamide bond;
- R1 represents a single bond or a C1-3 alkylene group;
- and R2 represents a C1-25 alkyl group or a fluoroalkyl group);
- and L represents —O—.
Dependencies are inferred from the claim text.