FLUORINATED THERMOPLASTIC POLYESTERS AND METHOD OF PREPARING THEREOF Russian patent published in 1999 - IPC

FIELD: chemical industry. SUBSTANCE: described are fluorinated thermoplastic polyesters having block structure [Z-R_f-Z-H₁-H₂-H₁-]- wherein R_f is perfluoropolyoxyalkylene unit of formula: -CF₂O-(CF₂CF₂O)_m-(CF₂O)_n-CF₂ wherein m and n are such integers that m/n ratio is within 0.2 and 5; Z is radical of general formula: CH₂O-(OCH₂CH₂)S- wherein S is 0-3; -H₁ is arylene and -H₂ is arylene or alkylarylene, R_F,M₁ and H₂ being units bonded to each other through ester groups; said polyesters have tensile strength at 230 C by ASTM D- 412-D method by at 50% least higher than that of corresponding polyesters derived from perfluoropolyoxyalkylenediols functionality of which is not higher than 1.96. Described is method of preparing said polyesters. EFFECT: title compounds have good mechanical properties within wide temperature range and have high thermal and chemical stability. 13 cl, 10 ex, 1 tbl