Patent No. EP1934268 (titled "Method Of Preparing Vinylchloride-Based Copolymer And Vinylchloride Plastisol Composition Including Vinylchloride-Based Copolymer Prepared Using The Method") was filed by LG Chem on Sep 12, 2006. The application was issued on Aug 19, 2015.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
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