Liquid tetracarboxylic dianhydrides and process for the preparation thereof
AssigneeHitachi Chemical Company, Ltd.
InventorsTooru Kikuchi, Hayato Kotani, Katsuyuki Masuda, Toshihiko Takasaki
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Abstract
The invention relates to a tetracarboxylic dianhydride represented by the following formula (1). [In formula (1) R1, R2, R3 and R4 each independently represent an alkyl group having from 1 to 5 carbon atoms, m represents a number from 1 to 30, all of the silicon atoms bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings, and all of the dicarboxylic anhydride groups bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings.]
Claims2
A tetracarboxylic dianhydride represented by the following formula (1).
- wherein in formula (1), R1, R2, R3 and R4 each independently represent an alkyl group having from 1 to 5 carbon atoms, and m represents a number from 1 to 30;
- all of the silicon atoms bonding to the norbornane rings in formula (1) are in an exo-configuration with respect to the norbornane rings, and all of the dicarboxylic anhydride groups bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings, and
- wherein the tetracarboxylic dianhydride represented by the following formula (1) has a viscosity of 0.1-45000 Pa·s at 25° C.
Dependencies are inferred from the claim text.