Flexsys files patent infringement suit vs. Korea Kumho Petrochemical

Brussels – Rubber chemicals supplier Flexsys N.V. has filed a patent infringement suit against a South Korean company regarding Flexsys’ 4-ADPA and PPD antidegradant patent rights, the company announced July 23.

Flexsys said it developed and patented its Nucleophilic Aromatic Substitution for Hydrogen technology for 4-ADPA, the key intermediate for production of PPD antidegradants, including 6PPD and IPPD. The company said it believes its technology has been copied by China’s Shandong Sinorgchem Co. Ltd., and is being used to export product to South Korea and elsewhere.

The…

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