POLYANHYDRIDES .7. SOLUBLE POLYANHYDRIDES DERIVED FROM ISOPHTHALIC ACID, 4-HYDROXYBENZOIC ACID AND VARIOUS DIPHENOLS

One series of poly(ester-anhydride)s, PEAs, was prepared by polyconden sation of isophthaloyl chloride with mixtures of silylated 4-hydroxybe nzoic acid and various dihydroxy-substituted naphthalenes. Most of the se PEAs are semicrystalline materials with glass transition temperatur es (T-g) in the range of 130-190 degrees C and melting temperatures (T -m) in the range of 220-350 degrees C. In a second series of PEAs, phe nylhydroquinone, bisphenol-A and 3,3'-dimethylbisphenol-A were used as diphenols. All but one PEA of the second series are amorphous materia ls with good solubility in chloroform and other organic solvents. GPC measurements indicated viscosity-average molecular weights ((M) over b ar(v)) up to 38 000.