FIELD: biotechnology.SUBSTANCE: invention relates to a random copolymer of propylene, to a process for its preparation, as well as to a film or film layer obtained from said copolymer. Copolymer of propylene (R-PP) and ethylene has a MFRmelt flow rate (230 °C) from 0.8 to 25.0 g/10 min, the Tmelting point from 128 to 138 °C. Copolymer contains ethylene from 5.3 to 9.0 % by weight, the content of the fraction soluble in cold xylene (XCS), in the range from 9.0 to 18.0 % by weight and the relative content of the isolated sequences of ethylene (I(E)) with respect to block sequences ranging from 45.0 to 69.0 %.EFFECT: propylene copolymer (R-PP) provides a film material obtained therefrom with a combination of a low seal initiation temperature (SIT) and unexpectedly high strength of the hot seam, and also exhibits good optical properties.10 cl, 4 ex, 3 tbl

Propylene statistical copolymer for application in films

FIELD: chemistry.SUBSTANCE: invention relates to a polymer composition for producing a cast article, a method of producing a nucleated terpolymer (A) of propylene, ethylene and one C-Cα-olefin, method of producing a terpolymer (A) of propylene, ethylene and one C-Cα-olefin, as well as to cast product. Polymer composition contains a terpolymer (A) of propylene, ethylene and one C-Cα-olefin (αO) and β-nucleating agent. Ethylene content in the terpolymer (A) ranges from 0.1 to 8.0 wt. % of total weight of terpolymer (A). Content of C-Cα-olefin (αO) in terpolymer (A) ranges from 0.1 to 16.0 wt. % of total weight of terpolymer (A). Melt flow rate MFR(230 °C) of terpolymer (A) measured according to ISO 1133 (230 °C, load 2.16 kg) is 0.5 to less than 12.0 g/10 minutes. Process for preparing nucleated terpolymer (A) propylene, ethylene and C-Cα-olefin (αO) is first prepared that the terpolymer (A) is propylene, ethylene and C-Cα-olefin (αO) polymerization reaction in the presence of a Ziegler-Natta (ZN-C), cocatalyst (Co) and optionally an external donor (ED). Obtained terpolymer (A) is treated with a nucleating agent. Further, the produced terpolymer (A) composition is cooled and crystallized. Ziegler-Natta catalyst (ZN-C) contains a compound of transition metal (TC) of group 4–6 of IUPAC, a metal compound (MC) of group 2 and an internal donor (ID). Internal donor (ID) represents an oil-oil compound, preferably it is not a phthalic acid ester. Said composition is used to produce cast article.EFFECT: invention increases impact strength of the composition and enables to obtain an article with high impact strength while maintaining a high level of rigidity.14 cl, 1 tbl, 6 ex

Composition of beta-nucleated propylene terpolymer with good impact strength

FIELD: manufacturing technology.SUBSTANCE: invention relates to a polypropylene composition (C) which is intended for making a film, a film made from said composition, as well as a method of producing a polypropylene composition (C). Polypropylene composition contains a heterophase propylene copolymer (RAHECO) and plastomer (PL). Heterophase propylene copolymer (RAHECO) contains a matrix (M) representing a disordered propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M). Comonomers of random copolymer of propylene (R-PP) and elastomeric copolymer of propylene (E) are ethylene and/or C-Colefins. Plastomer (PL) is a copolymer of ethylene and at least one C-Cα-olefin with density of less than 0.900 g/cmand melt flow rate MFR(190 °C/2.16 kg) from 10.0 to 40 g/10 minutes. Method of producing polypropylene composition (C) involves first polymerisation of propylene and ethylene and/or C-Cα-olefin in first reactor (R1). First fraction of a random copolymer of propylene (R-PP1) is obtained, which is transferred to a second reactor (R2). Further, polymerisation is carried out in the presence of a first fraction of a random copolymer of propylene (R-PP1) and ethylene and/or C-Cα-olefin. Second fraction of random copolymer of propylene (R-PP2) is obtained. First fraction of the random propylene copolymer (R-PP1) and the second fraction of the random propylene copolymer (R-PP2) form a random copolymer of propylene (R-PP), which is transferred to a third reactor (R3). After that, polymerisation is carried out in the presence of random copolymer of propylene (R-PP) and/or C-Cα-olefin. Third polymer fraction is obtained, which is an elastomeric copolymer (E). Propylene copolymer (R-PP) and the propylene elastomeric copolymer (E) form a heterophase propylene copolymer (RAHECO). Then a heterophase propylene copolymer (RAHECO) is mixed in the melt with a plastomer (PL). Film is made from said polypropylene composition.EFFECT: invention enables to obtain a polypropylene composition having improved optical and mechanical properties.13 cl, 1 dwg, 2 tbl, 3 ex

Vang Dzhingbo

Papers

Propylene statistical copolymer for application in films

Composition of beta-nucleated propylene terpolymer with good impact strength

Soft and transparent copolymers of propylene