FIELD: chemistry.
SUBSTANCE: invention relates to a processing aid, which is used in processing of thermoplastic polyurethanes, as well as to its obtaining and application in processing of thermoplastic polyurethanes into self-supporting films. The processing aid contains, wt %: hydrophobised, at least, partly aggregated metal oxide particles of pyrogenic origin, selected from the group, including aluminium oxide, silicon dioxide and mixtures of the said metal oxides 10-50, one or several thermoplastic polyurethanes 20-75, one or several isocyanates 0.5-25, one or several compounds, possessing an action of anti-adhesive or dispersing auxiliary substances 0.5-15. Also described are: a method of obtaining the processing aid and a method of manufacturing the self-supporting film, which includes dosing into an extruder a mixture of thermoplastic polyurethane and the processing aid, used in an amount from 0.5 to 35 wt % counted per the total amount of thermoplastic polyurethane, mixture melting and extrusion through a head for film extrusion with obtaining the film.
EFFECT: simplification of processing of thermoplastic polyurethanes, provision of maximally homogeneous mixing of thermoplastic polyurethane with liquid or viscofluid compounds, containing isocyanate groups.
6 cl, 2 tbl, 7 ex
