| http://www.w3.org/ns/prov#value | - A method for producing a polycarbodiimide copolymer, which comprises allowing at least one bifunctional liquid rubber selected from liquid rubbers having repeating structural units represented by the following formulae (1) and (2): (wherein each of a, b and c is an integer of from 0 to 200, and X represents an alkylene group having from 0 to 5 carbon atoms), an organic diisocyanate and a monoisocy
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