FIELD: chemical and pulp-and-paper industries. SUBSTANCE: fibers or threads of mixture of (i) polyethyleneterephthalate having carboxyl groups blocked by mono- and/or bis-carbodiimide groups in quantity 30-200 ppm and less than 3 mg-equ/kg of free carboxyl groups and (ii) polycarbodiimide or its interaction product with polyethyleneterephthalate containing less than 0.02 wt % of reactive carbodiimide groups are manufactured using extrusion shaping. EFFECT: enlarged resource for production of fibrous materials. 14 cl, 2 tbl
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