| http://www.w3.org/ns/prov#value | - Japanese Patent Public Disclosure No. 56-34006, Japanese Patent Public Disclosure No. 61-60084, Japanese Patent Public Disclosure No. 54-71136, etc. disclose a process for producing a copolymer of maleic anhydride and an alkene or diene having 4-6 carbon atoms such as butene, butadiene or isoprene.
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