COMPOSITION OF CC RANDOM COPOLYMER WITH IMPROVED BALANCE BETWEEN INITIAL TEMPERATURE OF WELDING AND MELTING TEMPERATURE Russian patent published in 2019 - IPC C08L23/14 C08F2/00 C08F210/06 C08F297/00 C08F4/64 C08J5/18 

FIELD: chemical industry.

SUBSTANCE: invention relates to composition C₂–C₃ random copolymer. Composition of C₂–C₃ random copolymer contains 3 polymer fractions (A), (B) and (C) with different comonomer content. Fraction (A) includes 30–65 wt. % C₂–C₃ random copolymer with ethylene content (C₂A) 0.4–1.5 wt.  % of the total mass of the copolymer (A), as measured using Fourier transform infrared spectroscopy (FTIR). Fraction (B) includes 25–50 wt. % C₂–C₃ random copolymer with ethylene content (C₂B) 3.0–10.0 wt. % of the total mass of the copolymer (B). Fraction (C) includes 5–35 wt. % C₂–C₃ random copolymer with ethylene content (C₂C) 7.0–15.0 wt. % of the total mass of the copolymer (C). Sum of 3 polymer fractions (A), (B) and (C) is 100 %, and the content of comonomer in the polymer fractions increases from fraction (A) to fraction (C) according to (C₂A) < (C₂B) < (C₂C).

EFFECT: technical result is an improved balance between the initial temperature of welding (SIT) and the melting point (Tm), good optical properties, low content of substances soluble in hexane.

10 cl, 3 dwg, 4 ex, 6 tbl