METHOD OF MODIFYING SURFACE OF POLYETHYLENE TEREPHTHALATE GRANULATE Russian patent published in 2013 - IPC C08J7/12 C08G63/02 C08G63/91 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer chemistry, particularly a method of modifying the surface of polyethylene terephthalate granulate. The surface modification method involves treating the granulate with a modifier while heating. The modifier used is a prepolymer with isocyanate groups in amount of 2 pts.wt per 100 pts.wt polyethylene terephthalate. The modifier is obtained by reacting polymethylene polyphenylene isocyanate with content of isocyanate groups of 29.5-31.0% with 1,1,9-trihydroperfluorononanol-1 in the presence of catalytic amounts of di-n-butyl tin dilaurate with molar ratio of reactants of 1:0.5:0.007, respectively, in a medium of o-dichlorobenzene and chloroform in volume ratio of 2:1 at 50°C, ultrasound frequency of 40 kHz for 3 hours. Modification is carried out in a medium of chlorobenzene at 150°C for 4 hours in the presence of catalytic amounts of di-n-butyl tin dilaurate.

EFFECT: invention widens the temperature range of using articles made from polyethylene terephthalate and increases heat resistance.

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