| 摘要 |
PROBLEM TO BE SOLVED: To provide an artificial amber having also physicochemical properties which amber has, e.g. transparency, gloss, insulating properties, processability, melting point, color tone or hardness. SOLUTION: The artificial amber is produced by crosslinking an exocyclic methylene group in a resin having peak tops in 108 ppm and 148 ppm based on spectrum obtained by measurement of<SP>13</SP>C-NMR. COPYRIGHT: (C)2006,JPO&NCIPI
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