1. A LINEAR HIGH MOLECULAR WEIGHT RESINOUS CONDENSATION POLYMER OF (A) AT LEAST ONE BIFUNCTIONAL CARBOXYLIC ACID AND (B) AT LEAST ONE BIFUNCTIONAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) 2,2,4,4-TETRAALKYL-1,3CYCLOBUTANEDIOLS AND (B) A MIXTURE COMPOSED OF 2,2,4,4TETRAALKYL-1,3-CYCLOBUTANEDIOLS AND UP TO 50 MOLE PERCENT OF SAID MIXTURE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A DIFFERENT BIFUNCTIONAL DIHYDROXY COMPOUND, A BIFUNCTIONAL AMINO-ALCOHOL, AND A BIFUNCTIONAL ALIPHATIC DIAMINE, SAID 2,2,4,4-TETRAALKYL-1,3-CYCLOBUTANEDIOLS BEING SELECTED FROM THE GROUP CONSISTING OF THE CISAND TRANS-ISOMERS THEREOF AND WHEREIN EACH ALKYL GROUP CONTAINS FROM 1 TO 4 CARBON ATOMS, THE RELATIVE PROPORTIONS OF (A) AND (B) CONSTITUENTS BEING SUCH AS TO CONSTITUTE A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYESTERS AND POLYESTERAMIDES.