Based on the search and analysis of patent literature,the patent protection characteristics of the key monomer of high performance polyester containing naphthalene in China were studied,including the annual trend,legal status,research type and applicant distribution of patent applications for 2,6-NDA/2,6-NDC technology,focusing on the patent technology layout of main applicants.The number of domestic patent applications for 2,6-NDA/2,6-NDC technology increased significantly until about 2000,and the preparation and purification technology of 2,6-NDA was mainly studied.Sinopec's patent technology layoutis very prominent,and since 2012,it has continued to carry out research in oxidation synthesis,esterification and product purification.Hyosung corporaton has carried out a few patent layouts in 2,6-NDA preparation process and equipment,and NDC purification process,but the proportion of valid patents is high.Coal Science and Technology Research Institute has a high degree of patent application activity in 2022,and the patent layout mainly focuses on 2,6-NDC purification processes and equipment.
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