| 摘要 |
Novel low-molecular weight polyesters consisting essentially of chain members of the formula -(O-X-O-Y)- I wherein X is at least one member selected from the group consisting of <IMAGE> +TR <IMAGE> and R is a bifunctional aliphatic hydrocarbon or a bifunctional hydrocarbon containing at least one aromatic or cycloaliphatic ring having an inherent viscosity of 0.08 to 0.35 dl/g measured at 30 DEG C. on a 100 ml solution of 0.5 g of polyester in a solvent of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane useful for further polymerization with amines, amides, imides and a novel method of preparing the same.
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