Aromatic homopolyimide or copolyimide films having low water absorption and high thermal durability
AssigneeE.I. du Pont de Nemours and Company
InventorsJohn A. Kreuz, Stuart N. Milligan
Life of this patent
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Abstract
Aromatic homopolyimide and copolyimide films derived from an aromatic dianhydride and a chlorinated aromatic diamine such as 2-chloro-p-phenylene diamine and 2,2'-dichloro-4,4'-diaminodiphenyl ether are described. The films have low water absorption, high elastic modulus and elongation and can be heat-processed without embrittlement.
Claims13
An aromatic homopolyimide or copolyimide film having low water absorption and high thermal durability comprising an aromatic tetracarboxylic dianhydride component and an aromatic diamine component wherein said aromatic diamine component comprises from 30 to 100 mole %, based on the total molar amount of diamine present, of a chlorinated aromatic diamine selected from the group consisting of 2-chloro-p-phenylene diamine and 2,2'-dichloro-4,4'-diaminodiphenylether.
Dependencies are inferred from the claim text.