Examples of the aliphatic diols and/or dihydroxybenzene compounds used as component (B) in this invention include aliphatic diols such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, neopentyl glycol or hexamethylene glycol; alicyclic-containing aliphatic diols such as cyclohexane dimethylol or tricyclodecane dimethylol; aliphatic diols containing an aromatic ring