NEW COMPOSITIONS FOR MOLDED POLYAMIDES PRODUCING Russian patent published in 2017 - IPC C08G69/14 C08G69/18 C08G69/20 C08L77/02 C08K5/29 C08K5/34 

FIELD: technological processes.

SUBSTANCE: invention relates to versions of composition for producing molded polyamides, to cured lactam melt, to injection polyamide and method for production thereof, as well as to use of one or more composition components. Composition for molded polyamides producing contains following components: a) hardened lactam melt, including from 0.1 to 5 wt% of, at least one polymer carbodiimide and/or at least one uretdione as activator, and b) hardened lactam melt, including from 0.2 to 5 wt% of catalyst such as magnesium lactam-halide, alkali metal aluminodilactam, alkali and/or alkali-earth metal lactam, and/or component c) hardened lactam melt, including simultaneously from 0.2 to 5 wt% of said catalyst and from 0.1 to 5 wt% of said activator. Hardened lactam melt is obtained by mixing melt consisting of caprolactam and 0.1–5 wt% of said activator, with melt consisting of caprolactam and 0.2–5 wt% of said catalyst at temperature from 70 to 120 °C during period of time from 1 to 60 seconds. One or more said composition components are used for production of cast polyamides. Method of cast polyamides producing involves, that performing polymerization of one or several hardened lactams in injection mold at temperature from 100 to 160 °C.

EFFECT: invention allows to increase compositions storage life and produce polyamide with homogeneous structure.

14 cl, 2 tbl, 14 ex