POLYOLEFIN MOTHER MIXTURE AND COMPOSITION SUTABLE FOR CASTING UNDER PRESSURE Russian patent published in 2008 - IPC C08L23/10 C08L23/12 C08L23/14 C08J3/22 C08F110/06 C08F210/06 C08L23/16 

FIELD: chemistry.

SUBSTANCE: composition of mother mixture has value of characteristic viscosity [η] of fraction, soluble in xilol at room temperature, equal or higher than 3,5 dl/g and contains 50-90 wt % of crystalline polypropylene and 10-50 wt % of ethylene copolymer and, at least, one C₃-C₁₀ α-olefin, which contains from 15 to 50 % of ethylene. Crystalline polypropylene contains two fractions with melt flow rate at 230°C and loading 2.16 kg from 0.1 to 10 g/10min (MFR^I) and from 10 to 68 g/min (MFR^II), respectively. Ratio MFR^I/MFR^II is from 5 to 60.

EFFECT: obtaining end polyolefin composition, ready for manufacturing by casting under pressure of large products, which have excellent surface appearance due to reduction of tiger stripes and absence of gels.

7 cl, 2 tbl, 5 ex