. . "hthalic acid, and a glycol component which is, for example, an aliphatic glycol such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, decamethylene glycol, diethylene glycol of 2,2-dimethylpropanediol, an alicyclic glycol such as hexahydroxylylene glycol, an aromatic-aliphatic glycol such as xylene glycol, or an aromatic dihydroxy compound such as resorcinol or hyd" . . .