METHOD OF PREPARING MIXED POLYAMIDE COMPOSITION Russian patent published in 2011 - IPC C08L77/00 C08L23/26 C08F8/46 

FIELD: chemistry.

SUBSTANCE: polymeric mixed composition is obtained through co-extrusion of polyamide in a melt with a modifying additive. The modifying additive is a mixture of polyethylene with a copolymer of ethylene with C_3-8 olefin in ratio of components (pts. wt) between 1:9 and 9:1. Before co-extrusion in a melt with polyamide 6, the modifying additive undergoes reaction extrusion. 0.3-3 wt % polar monomer and 0.1-0.6 wt % organic peroxide are further added to the composition at the co-extrusion step at reaction extrusion temperature of 170-240°C and the following ratio of components in the polyamide composition, wt %: polyamide 6 - up to 100, modifying additive 15-45. Co-extrusion temperature 235-275°C.

EFFECT: invention reduces melt flow index of the molten mass, enables to obtain impact resistant and petroleum product-resistant polyamide materials and also simplifies technology of producing said materials.

4 cl, 2 tbl, 24 ex