FIELD: chemistry.
SUBSTANCE: invention relates to a method of nucleating polypropylene resins for enhancing their physical, mechanical and/or optical properties. Method involves mixing a molten polyolefin composition containing 95-99.9 wt % polypropylene resin with polydispersity index P.I. (1) and 0.1-5 wt % of at least one propylene polymer with polydispersity index P.I. (2) greater than or equal to 15, where values of P.I. (1) and P.I.(2) satisfy the inequality P.I.(2)-P.I.(1)≥10. The mixture is then cooled. Polypropylene polymers obtained using the said method can be easily used to produce articles through moulding and extrusion, particularly for making thin-walled articles such as articles made through thermoshaping, extrusion or blow moulding with extrusion.
EFFECT: method significantly lowers the cost of producing nucleated polypropylene resins compared to methods which employ conventional nucleating agents in usual amounts.
7 cl, 6 tbl, 8 ex
