METHOD OF MODIFYING SURFACE OF POLYETHYLENE TEREPHTHALATE POWDER Russian patent published in 2015 - IPC C08J7/12 C08L67/02 C08G63/91 

FIELD: chemistry.

SUBSTANCE: method of modifying the surface of polyethylene terephthalate powder is realised by treating polyethylene terephthalate with a fluorine-containing modifier while heating in a solvent medium. Polyethylene terephthalate powder is treated with a polyfluorinated alcohol selected from 1,1,3-trihydroperfluoropropanol-1, 1,1,5-trihydroperfluoropentanol-1, 1,1,7-trihydroperfluoroheptanol-1 and 1,1,9-trihydroperfluorononanol-1, in amount of 5 pts.wt per 100 pts.wt polyethylene terephthalate, at 50°C in a medium of n-heptane for 3 hours with ultrasonic frequency of 40 kHz. The size distribution of polyethylene terephthalate particles is as follows, wt %: fine fraction with diameter of 50-80 mcm - 90, conglomerates with size of 100-150 mcm - 7, coarse particles in the form of flakes with size of 200-300 mcm - 3.

EFFECT: improving the degree of crystallinity of polyethylene terephthalate powder when adding polyfluorinated alcohol as a result of the high compatibility thereof, which has a positive effect on increase in thermal and thermal oxidative stability of polyethylene terephthalate.

1 tbl, 4 ex