Polypropylene containing c3c4 fraction

Patent metadata

Field	Value
Publication number	US-2025197619-A1
Application number	US-202318847905-A
Country	US
Kind code	A1
Filing date	Mar 22, 2023
Priority date	Mar 24, 2022
Publication date	Jun 19, 2025
Grant date	—

Abstract

Polypropylene composition containing units derived from 1-butene.

First claim

1 . A polypropylene composition having:
(a) a melt flow rate (ISO1133, 230° C., 2.16 kg) of 1.0 to 7.0 g/10 min, and (b) a content of units derived from 1-butene of 1.5 to 9.0 wt.-% as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy; and (c) 0.15 to 1.20 mol-% of 2.1 erythro regio-defects determined by 13 C-NMR spectroscopy; and (d) at least one melting temperature Tm measured by differential scanning calorimetry (DSC) according to ISO 11357-3 meeting the requirement
Tm>154° C.−[2.2×content of units derived from 1-butene/wt.-%]° C.
whereby the units derived from 1-butene are determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy when the polypropylene composition is unnucleated
or alternatively
at least one melting temperature Tm measured by differential scanning calorimetry (DSC) according to ISO 11357-3 meeting the requirement
Tm>156° C.−[2.2×content of units derived from 1-butene/wt.-%]° C.
whereby the units derived from 1-butene are determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy when the polypropylene composition is nucleated; and
(e) a flexural modulus (FM) in the range of 1100 to 1600 MPa determined in 3-point-bending according to ISO 178 on injection molded specimens of 80×10×4 mm 3 prepared in accordance with ISO 294-1:2017; (f) xylene cold soluble fraction (XCS; ISO 16152) in the range from 2.0 to 4.0 wt.-%, and (g) optionally a nucleating agent in an amount of 0.0001 to 1.0 wt.-%, based on the total weight of the polypropylene composition.

2 . The polypropylene composition according to claim 1 having a haze according to ASTM D1003-00 ranging between 15% to 35%, measured on a test specimen of 1 mm which is prepared in accordance with ISO 294-1:2017 and/or a haze ranging between 0.4% to 2.0%, measured on a cast film of 50 μm thickness according to ASTM D1003-00.

3 . The polypropylene composition according to claim 1 having a content of units derived from 1-butene of 1.5 to 4.0 wt.-% as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy.

4 . The polypropylene composition according to claim 1 having a flexural modulus determined in 3-point-bending according to ISO 178 on injection molded specimens of 80×10×4 mm 3 prepared in accordance with ISO 294-1:2017 of 1250 to 1550 MPa.

5 . The polypropylene composition according to claim 1 having a sealing initiation temperature (SIT), as determined by a method described in the experimental part on a 50 μm cast film, ranging between 90 to 127° C.

6 . The polypropylene composition according to claim 1 having at least one melting temperature Tm measured by differential scanning calorimetry (DSC) according to ISO 11357-3 in the range of 150 to 160° C.

7 . The polypropylene composition according to claim 1 including:
(i) 30 to 70 wt.-% of a propylene homopolymer (A) having a melt flow rate of 1.0 to 10.0 g/10 min (ISO1133, 230° C., 2.16 kg); and
(ii) 70 to 30 wt.-% of a propylene butene copolymer (B).

8 . The polypropylene composition according to claim 1 having a melt flow rate (ISO1133, 230° C., 2.16 kg) of 2.0 to 7.0 g/10 min.

9 . The polypropylene composition according to claim 1 having a tensile modulus in machine direction (TM-MD) measured according to ISO 527 ranging between 670 to 790 MPa.

10 . The polypropylene composition according to claim 1 having a tensile modulus in transverse direction (TM-TD) measured according to ISO 527 ranging between 650 to 780 MPa.

11 . The polypropylene composition according to claim 1 having seal strength at 135° C. measured according to the method described in description ranging between 9.5 to 16 N.

12 . The polypropylene composition according to claim 1 having
(b) a content of units derived from 1-butene of 1.5 to 4.0 wt.-% as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy; and
(e) a flexural modulus (FM) within the range of 1250 to 1550 MPa determined in 3-point-bending according to ISO 178 on injection molded specimens of 80×10×4 mm 3 prepared in accordance with ISO 294-1:2017.

13 . A film made from a polypropylene composition as defined in claim 1 .

14 . The film according to claim 13 wherein the film is a cast film.

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Gahleitner Markus
• Bernreitner Klaus
• Niedersüss Peter
• Ortner Stefan
• Fawaz Joel
• Friedrich Karlheinz
• Leskinen Pauli

Classifications

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2203/16

  used for films · CPC title

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08K5/01

  Hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C08J2423/14

  Copolymers of propene (C08J2423/16 takes precedence) · CPC title