FIELD: chemistry.
SUBSTANCE: invention relates to polymer materials, particularly, to introduction of additives into polymer materials. Method of introducing an additive into a polymeric material comprises selecting a liquid composition comprising additive, a carrier and an active compound added to increase melt viscosity of polymeric material. Polymeric material is polyester. Active compound selected from anhydride, epoxide, melamine, oxazoline, oxazolinone, lactam, carbodiimide, polyepoxy, isocyanate, polyacyllactam and phophonate. Liquid composition is brought into contact with polymeric material in device for melt. Rotary-cavity mixer is used. Fibre is preferably obtained from polymeric material.
EFFECT: invention simplifies method, enables to obtain a product with improved properties due to recovery of pressure at extrusion and excluding decomposition of polymer and carrier.
22 cl, 1 dwg, 5 tbl, 8 ex
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