| 摘要 |
The present invention relates to a polyester resin whose crystallization is improved and comprises a cyclic compound represented by a following formula A1-B-A2 (in the formula, A1 and A2 are the same or different and show groups represented by a below-described formula, <CHEM> P shows a benzene ring which may be replaced by a material, and B shows a bivalent hydrocarbon group which may be replaced by a material) and polyester capable of having a crystal structure. <IMAGE>
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