FIELD: chemical industry.
SUBSTANCE: present invention relates to a group of inventions: a polyolefin composition for injection molding of large-sized products, an impact strength modifier, a film containing a polyolefin composition and a product. This polyolefin composition contains: A) from 5 to 35 wt. % of propylene homopolymer; C) from 20 to 50 wt. % ethylene homopolymer; and C) from 30 to 60 wt. % terpolymer of ethylene, propylene and links obtained from 1-butene. The quantities (A), (B) and (C) taken in relation to the total mass (A) + (B) + (C), where the sum of the quantities (A) + (B) + (C) is 100 wt. %. The propylene homopolymer contains 10 wt. % or less of the fraction soluble in xylene at 25°C (XSA), and the fraction of the XSA fraction is taken in relation to the mass (A). Ethylene homopolymer contains 5 wt. % or less of the fraction soluble in xylene at 25°C (XSB), relative to the mass (B). The links are obtained from 1-butene containing from 45 wt. % up to 65 wt. % of ethylene units, and containing from 15 wt. % to 38 wt. % of 1-butene units, and containing from 30 wt. % up to 85 wt. % of the fraction soluble in xylene at 25°C (XSC), and the number of ethylene units, 1-butene units and the XSC fraction is taken in relation to the mass (C). The impact strength modifier contains a polyolefin composition. The product containing the polyolefin composition is obtained by injection molding. The present invention relates to polyolefin compositions, their preparation and their use as a modifier of impact resistance in polyolefin mixtures.
EFFECT: mixed compositions of polyolefins obtained in this way can be used for injection molding of large-sized products that demonstrate improved mechanical properties, for example, toughness and scratch resistance.
15 cl, 3 tbl, 1 ex
