prov:value
| - ct bonding, an alkylene group of a carbon number of 1 to 6, an alkylidene group having a carbon number of 2 to 6, a cycloalkylidene, an arylalkylidene group, O, SO, SO.sub.2, CO, S,CF.sub.2, C(CF.sub.3).sub.2 or NH.The aforementioned diols (a3' 1) include, for example, straight chain alkylenediols having a carbon number of 2 to 18 such as ethylene glycol, 1,4-butanediol (hereinafter abbreviated as
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