Illustrative examples of the glycol include aliphatic diols such as tetramethylene glycol, propylene glycol, 1,3-butanediol, neopentyl glycol and the like; alicyclic diols such as cylohexanedimethanol, tricyclodecanedimethylol and the like; and aromatic diols such as bisphenol A, bisphenol S, bishydroxyethoxy bisphenol A, tetrabromobisphenol A and the like.