Fluorine-containing polyurethanes
Abstract
Abstract A METHOD OF PREPARING FLUORINE-CONTAINING POLYURETHANES WHICH COMPRISES RECURRING UNITS REPRESENTED BY THE STRUCTURAL FORMULA (-O-R-O-CO-NH-1,4-PHENYLENE-C(-CF3)2-1,4-PHENYLENE-NH-CO)N WHEREIN R REPRESENTS A DIVALENT RESIDUE OF EITHER GLYCOLS, HYDROXYL-CONTAINING POLYESTERS, BISPHENOLS OR FLUORINECONTAINING DERIVATIVES OF SAID COMPOUNDS AND HAVE DEGREE OF POLYMERIZATION N=7-20, CHARACTERIZED IN THAT THEY ARE PRODUCTS OF THE REACTION OF EITHER GLYCOLS, HYDROXYLCONTAINING POLYESTERS, BISPHENOLS OR FLUORINE-CONTAINING DERIVATIVES OF SAID COMPOUNDS WITH HEXAFLUOROISOPROPYLIENE-P,P''-DIPHENYLDIISOCYANATE REPRESENTED BY THE FORMULA BIS(4-(O=C=N-)-PHENYL)-C(-CF3)2 IN ORGANIC MEDIA AT A TEMPERATURE RANGING FROM 20 TO 150* C. AT A MOLAR RATIO SAID HYDROXYL-CONTAINING REAGENTS TO DIISOCYANATE EQUAL TO 1:1-1.5 RESPECTIVELY. THE PROPOSED FLUORINE-CONTAINING POLYURETHANES, WHILE PRESERVING THE PROPERTIES INHERENT TO CONVENTIONAL POLYURETHANES (HIGH ADHESION AND COHESION, ELASTICITY, WEARRESISTANCE, FROST-RESISTANCE) ARE CHARACTERIZED IN HIGH HYDROLYTIC STABILITY AND ENHANCED THERMAL STABILITY.
Inventors
- 👤 T Dymshits
- 👤 S Vinogradova
- 👤 I Knunyants
- 👤 B Livshits
Bibliographic Details
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