DISPERSION OF POLYTETRAFLUOROETHYLENE IN ORGANIC SOLVENT AND DISPERSANTS INVOLVED Russian patent published in 2001 - IPC

FIELD: polymer materials. SUBSTANCE: invention provides new dispersion of polytetrafluoroethylene in organic solvent containing (i) 2 to 40 wt.% powdered polytetrafluoroethylene; (ii) 50 to 95 wt.% organic solvent; and (iii) 0.5 to 10 wt.% dispersant depicted by general formula, wherein x is integer from 1 to 3, y 0 or 1, provided that x=1 when y=1; R_H denotes x-functional radical constituting either (a) linear or branched alkyl or cycloalkyl C5-C10 or alkylaryl or arylalkyl C10-C50-chain optionally containing hydroxyl or C1-C4-alkoxy group or (b) polyoxyalkylene chain, wherein alkylene has 2 to 4 carbon atoms and number of oxyalkylene groups varies between 5 and 70, preferably between 10 and 50; R_F denotes (per)fluoropolyoxyalkylene radical with average molecular weight between 350 and 2000; L denotes bivalent organic group (bridged by R_F and R_H,) selected from: , in which R¹ is hydrogen or C1-C4-alkyl, R² hydrogen or C1-C2-alkyl, a and b are integers from 1 to 3. Solvent of dispersion has surface tension below 30 din/cm and flash point above 10 C. Dispersions are used for surface treatment of metals, glass fibers, etc. , and in particular as release lubricant for molds. EFFECT: improved working characteristics. 12 cl, 2 tbl, 9 ex