POLYPROPYLENE POLYMER COMPOSITION WITH HIGH RIGIDITY PROPERTIES Russian patent published in 2024 - IPC C08L23/10 C08F2/00 C08F10/06 C08F110/06 C08K5/00 B65D1/00 

FIELD: manufacturing technology; molding.

SUBSTANCE: group of inventions relates to a polypropylene polymer composition for producing molded articles, a method for production thereof and an article molded from the composition in the form of a container. Polypropylene polymer composition for producing molded articles contains a first polypropylene polymer in combination with a second polypropylene polymer, wherein the melt flow rate of the first polypropylene polymer ranges from 0.1 g/10 min to 3 g/10 min and the content of xylene soluble substances ranges from 1.0% by weight to 7% by weight, wherein the melt flow rate of the second polypropylene polymer ranges from 5 g/10 min to 100 g/10 min and the content of xylene-soluble substances ranges from 1 wt.% to 7 wt.%. First polypropylene polymer is present in the polymer composition in amount of 30% to 66% by weight and the first polypropylene polymer and the second polypropylene polymer both contain polypropylene polymers catalysed by a non-phthalate Ziegler–Natta catalyst. Bending modulus of polypropylene polymer composition ranges from 1,500 MPa to 2,500 MPa, content of xylene-soluble substances in the polypropylene polymer composition ranges from 2.5% to 7% by weight, wherein the first polypropylene polymer is a homopolymer, second polypropylene polymer is a polypropylene homopolymer or a copolymer of polypropylene and ethylene, having an ethylene content of less than or equal to 1.5% by weight, where the melt flow rate is measured in accordance with ASTM D 1238, at 230 °C with load of 2.16 kg and the flexural modulus is determined in accordance with ASTM D790-10 method A at 1.3 mm/min using a sample of type 1 according to ASTM 3641, cast in accordance with ASTM D4101.

EFFECT: providing a polymer composition having relatively high stiffness and mechanical viscosity properties without detriment to catalytic activity and with a wide distribution by molecular weight, which improves processability of the composition.

23 cl, 1 dwg, 1 tbl, 15 ex