US 12,006,424 B2
Polymer composition suitable for gamma-ray sterilization
Jingbo Wang, Linz (AT); Markus Gahleitner, Linz (AT); and Klaus Bernreitner, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/288,668
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Oct. 23, 2019, PCT No. PCT/EP2019/078794
§ 371(c)(1), (2) Date Apr. 26, 2021,
PCT Pub. No. WO2020/088996, PCT Pub. Date May 7, 2020.
Claims priority of application No. 18203384 (EP), filed on Oct. 30, 2018.
Prior Publication US 2021/0395503 A1, Dec. 23, 2021
Int. Cl. C08L 23/12 (2006.01); A61L 2/08 (2006.01); C08K 5/00 (2006.01); C08K 5/01 (2006.01); C08K 5/1575 (2006.01); C08K 5/526 (2006.01)
CPC C08L 23/12 (2013.01) [A61L 2/081 (2013.01); C08K 5/005 (2013.01); C08K 5/0083 (2013.01); C08K 5/01 (2013.01); C08K 5/1575 (2013.01); C08K 5/526 (2013.01); A61L 2202/23 (2013.01); C08L 2201/08 (2013.01); C08L 2203/02 (2013.01); C08L 2314/06 (2013.01)] 13 Claims
 
1. A polymer composition (C), comprising, based on the total weight of the polymer composition (C):
(a) 91.0 to 98.0 wt.-% of a propylene homopolymer (H-PP),
(b) 1.98 to 8.98 wt.-% of at least one hydrocarbon oil (WO),
(c) 0.01 to 0.7 wt.-% of at least one nucleating agent (NA), and
(d) 0.01 to 2.0 wt.-% of at least one antioxidant (AO);
wherein the sum of components (a), (b), (c) and (d) adds up to at least 95 wt.-% of the total weight of the polymer composition (C) and the propylene homopolymer (H-PP) is an isotactic propylene homopolymer defined by
(i) a melt flow rate MFR2 determined according to IS01133 at 230 ° C. and 2.16 kg in the range from 4.0 to 22.0 g/10 min;
(ii) a melting temperature in the range of 145 to 162° C. as determined by differential scanning calorimetry (DSC); and
(iii) a content of 2,1 erythro regio-defects in the range from 0.1 to 1.3 mol % as determined by 13C-NMR spectroscopy.