POLYETHYLENE POLYMER COMPOSITIONS AND ARTICLES MADE THEREFROM Russian patent published in 2025 - IPC C08L23/08 C08K5/5317 C08J3/20 B29D7/01 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to polymer compositions such as polyethylene polymer compositions containing a branched alkylphosphonic acid salt for making articles. Polymer composition for making thermoplastic articles contains (a) a polyethylene polymer composition having a melt relaxation ratio of 1.5 or more, wherein the melt relaxation ratio (MRR) is calculated by the following formula: , where tan δ is the ratio of the shear loss modulus and the shear accumulation modulus (G''/G') of the polyethylene polymer composition, tan δ_0.1 rad / s is tan δ, measured at angular frequency of 0.1 rad/s, and tan δ₁₀ rad/s is the tan δ measured at angular frequency of 10 rad/s; and (b) a branched alkyl phosphonic acid salt, wherein the branched alkyl phosphonic acid salt contains one or more cations selected from the group consisting of the following: cations of group 1 elements, cations of group 2 elements and cations of group 12 elements, and branched alkyl phosphonic acid contains a branched alkyl group selected from a group consisting of the following: sec-butyl, isobutyl, tert-butyl, tert-pentyl, neopentyl, isopentyl, sec-pentyl, pentan-3-yl and 2-methylbutyl. Described also is a method of moulding a thermoplastic polymer composition, comprising extruding a molten polymer composition through an extruder die to produce a blowing workpiece, gripping the workpiece for blowing into a mould cavity, Injection of pressurized fluid medium into the workpiece for blowing under pressure sufficient to blow the workpiece for blowing so that it corresponds to the inner surface of the mould cavity and forms a moulded article.

EFFECT: providing polyethylene polymer compositions having a desirable combination of physical characteristics, such as a high barrier to water vapor and/or oxygen, low turbidity, high transparency and/or high lustre.

21 cl, 9 tbl, 8 ex