US 12,084,564 B2
Foamable polypropylene composition
Daniela Mileva, Linz (AT); Susanne Kahlen, Linz (AT); Patrick Rover, Linz (AT); Georg Grestenberger, Linz (AT); Jingbo Wang, Linz (AT); Klaus Bernreitner, Linz (AT); and Markus Gahleitner, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/278,028
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Oct. 2, 2019, PCT No. PCT/EP2019/076676
§ 371(c)(1), (2) Date Mar. 19, 2021,
PCT Pub. No. WO2020/074335, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 18199123 (EP), filed on Oct. 8, 2018.
Prior Publication US 2021/0355307 A1, Nov. 18, 2021
Int. Cl. C08L 23/12 (2006.01); C08J 9/00 (2006.01); C08J 9/04 (2006.01); B29C 45/00 (2006.01); B29K 23/00 (2006.01); B29K 105/04 (2006.01)
CPC C08L 23/12 (2013.01) [C08J 9/0023 (2013.01); C08J 9/0052 (2013.01); C08J 9/0066 (2013.01); C08J 9/0095 (2013.01); C08J 9/04 (2013.01); B29C 45/0001 (2013.01); B29K 2023/12 (2013.01); B29K 2105/04 (2013.01); C08J 2323/12 (2013.01); C08J 2423/14 (2013.01); C08L 2201/08 (2013.01); C08L 2203/14 (2013.01); C08L 2203/30 (2013.01); C08L 2205/025 (2013.01); C08L 2205/24 (2013.01); C08L 2314/06 (2013.01)] 11 Claims
 
1. A polypropylene composition comprising:
a) from 65 to 85 wt. %, based on the total weight of the composition, of a polypropylene homopolymer (HPP),
b) from 10 to 35 wt. %, based on the total weight of the composition, of a polypropylene copolymer (CPP),
c) from 0 to 20 wt. %, based on the total weight of the composition, of a filler (F), wherein the filler (F) is selected from the group consisting of talcum, mica, wollastonite, glass fibers, carbon fibers, and mixtures thereof, and
d) from 2.5 to 5 wt. %, based on the total weight of the composition, of at least one additive selected from the group consisting of colorants, pigments, stabilisers, acid scavengers, foaming agents, antioxidants and mixtures thereof,
wherein the composition comprises from 0.1 to 0.5 wt. %, based on the total weight of the composition, of one or more nucleating agents, and
wherein the sum of the amount of the polypropylene homopolymer (HPP), the polypropylene copolymer (CPP), the filler (F), the at least one additive and the one or more nucleating agents in the polypropylene composition is 100.0 wt. %,
wherein the polypropylene homopolymer (HPP) has:
i) a melting temperature Tm measured by differential scanning calorimetry (DSC) in the range from 150 to 160° C.,
ii) a content of 2,1 erythro regiodefects as determined from 13C-NMR spectroscopy in the range from 0.50 to 1.00 mol. %,
iii) an isotactic triad fraction (mm) determined from 13C-NMR spectroscopy of at least 97.5%, and
iv) a xylene cold soluble fraction (XCS) determined at 23° C. according ISO 16152 of equal or below 1.5 wt. %.