| http://www.w3.org/ns/prov#value | - A copolyimide according to claim 7, wherein R3 and R7 are each independently of the other radicals of formula ##STR20## wherein two bonds are attached in ortho-position to each other, and Y3 is a direct bond, or Y3 is --S--, --O--, --CH2 -- or --CO--.
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