| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a method of producing a coloured polypropylene composition, having high content of -modification. Propylene is mixed in a melt with at least one inorganic pigment and at least one nucleating centre for -crystallisation. Addition of the inorganic pigment and the nucleating centre for -crystallisation is separated either with respect to the order of addition or at least with respect to the arrangement of the inorganic pigment and the nucleating centre for -crystallisation, i.e., the two are contained in separate concentrates. The requirement for separate addition of the inorganic pigment and the nucleating centre for -crystallisation is also met when separate concentrates are merged into a third concentrate before said third concentrate is mixed in a melt with polypropylene. ^ EFFECT: tubes made from the polypropylene composition have high impact strength. ^ 22 cl, 3 tbl, 3 ex |
