METHOD OF PREPARING REINFORCED POLYAMIDE COMPOSITION Russian patent published in 2000 - IPC

FIELD: polymer production. SUBSTANCE: following features distinguish method, in which composition is prepared by mixing, in extruder plasticator, polyamide, glass fiber, polyolefin, and modifying additive, coextrusion at temperature exceeding melting point of polyamide, cooling and granulation of mixture. Polyolefin is polypropylene or its mixture with polyethylene and/or ethylene/propylene copolymer at polypropylene-to-polyethylene and/or to- ethylene/propylene copolymer weight ratio from 9:1 to 1:9. Modifying additive is copper salt mixed with alkali metal halide or with 1,2,3- benzotriazole at weight ratio of copper salt to second component from 1:20 to 1:0.5, and fatty acid amide. Polyolefin is fed into plasticator together with polyamide and modifying additive before addition of glass fiber. Composition contains, wt %: glass fiber 10-40, above-defined polyolefin 5-30, mixture of copper salt with alkali metal halide or 1,2,3- benzotriazole 0.005-0.5, fatty acid amide 0.1-3, polyamide - the balance. EFFECT: increased strength, water resistance, increased lifetime in air at elevated temperature, and simplified preparation technology. 2 cl, 25 ex