1,4-Benzenedicarboxylic acid, 1,4-dimethyl ester, polymer with 1,4-cyclohexanedimethanol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol, manuf. of, by-products from, reaction products with ethylene glycol, polymers with 1,4-cyclohexanedimethanol, diethylene glycol, ethylene glycol, maleic anhydride and phthalic anhydride, 3a,4,5,6,7,7a-hexahydro-4,7-methano-1H-inden-5(or 6)-yl esters