| abstract |
FIELD: chemistry. n 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 C 3 -C 10 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. n 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. n 7 cl, 2 tbl, 5 ex |