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US 5,508,357 AGranted
Polyimides, thermosetting resin compositions containing the polyimides, formed articles of the resin compositions, and production process of polyimides
AssigneeHitachi Chemical Company, Ltd.
InventorsHidekazu Matsuura, Yoshihide Iwasaki, Kaori Ikeda, Takayuki Suzuki, Masashi Tanaka, Yasuo Miyadera
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Abstract
A polyimide comprises structural units represented by the following formula: ##STR1## wherein Ar is a group consisting of 10-90 mole % of a first specific structural sub-unit and 90-10 mole % of a second particular structural sub-unit. A process for the production of the polyimide and a thermosetting resin composition comprising the polyimide and a particular polymaleimide are also disclosed.
Claims3
A polyimide comprising structural units represented by the following formula (I):
- ##STR12## wherein Ar is a group consisting of:
- i) 10-90 mole % of a structural sub-unit represented by the following formula (a'):
- ##STR13## wherein Z.sup.1 and Z.sup.3 represent --O--, and Z.sup.2 represents --SO.sub.2 --, or --C(CH.sub.3).sub.2 --, and
- ii) 90-10 mole % of another structural sub-unit represented by the following formula (b):
- ##STR14## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent a hydrogen atom or a C.sub.1-4 alkyl or alkoxyl group, at least two of which are independently an alkyl or alkoxyl group and X is --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --O--, --SO.sub.2 --, --C(.dbd.O)-- or --CO--NH--.
2 more elements
Dependencies are inferred from the claim text.