| http://www.w3.org/ns/prov#value | - Particularly preferred copolyimides are those wherein R1 and R5 are each independently of the other radicals of formula ##STR6## wherein two bonds are in ortho-position to each other, Y1 is a direct bond, --CH2 --, --O--, --S-- or --SO2 --, and Y2 is a direct bond, --O--, --S-- or --CO--.
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