US 12,415,913 B2
Heterophasic propylene copolymers, methods, films, and articles thereof
Luiza Burns Barreto, São Paulo (BR); Antonio Carlos Quental, São Paulo (BR); and Gerd Lohse, Pittsburgh, PA (US)
Assigned to Braskem S.A., Camaçari (BR)
Appl. No. 17/422,365
Filed by Braskem S.A., Camaçari (BR)
PCT Filed Jan. 13, 2020, PCT No. PCT/IB2020/020005
§ 371(c)(1), (2) Date Jul. 12, 2021,
PCT Pub. No. WO2020/144544, PCT Pub. Date Jul. 16, 2020.
Claims priority of provisional application 62/791,329, filed on Jan. 11, 2019.
Prior Publication US 2022/0112365 A1, Apr. 14, 2022
Int. Cl. C08L 23/14 (2006.01); B29C 48/00 (2019.01); B29C 48/10 (2019.01); B29K 23/00 (2006.01); B29K 105/16 (2006.01); B29L 23/00 (2006.01); B32B 5/02 (2006.01); B32B 15/085 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/32 (2006.01); C08J 5/18 (2006.01)
CPC C08L 23/14 (2013.01) [B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/10 (2019.02); B32B 5/022 (2013.01); B32B 5/024 (2013.01); B32B 15/085 (2013.01); B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/32 (2013.01); C08J 5/18 (2013.01); B29K 2023/14 (2013.01); B29K 2105/16 (2013.01); B29L 2023/001 (2013.01); B32B 2250/02 (2013.01); B32B 2307/54 (2013.01); C08J 2323/14 (2013.01); C08J 2423/14 (2013.01); C08L 2203/16 (2013.01); C08L 2205/025 (2013.01); C08L 2308/00 (2013.01)] 38 Claims
 
1. A heterophasic propylene copolymer composition, comprising:
a heterophasic propylene copolymer, comprising:
a polymer matrix of a random propylene copolymer that comprises one or more comonomers in an amount ranging from about 0.5 to 8.0 wt. % of the random propylene copolymer; and
an elastomeric copolymer dispersed in the polymer matrix in an amount ranging from about 10 to 35 wt. %, relative to the weight of the composition, the elastomeric copolymer comprising propylene and one or more comonomers, the one or more comonomers being present in an amount ranging from about 15 to 60 wt. % of the elastomeric copolymer,
wherein the composition has a total comonomer content ranging from about 4 to 25 wt. %, and
wherein the composition has a melt flow rate, measured according to ISO 1133 at 230° C. under a 2.16 kg load, ranging from about 0.3 to 1.0 g/10 min,
wherein the composition has a melting temperature (Tm, in degrees Celsius), as determined by differential scanning calorimetry (DSC), in accordance with equation (I):
Tm≤150−(0.23×XCS)  (I)
where XCS is the xylene cold soluble fraction (in % terms) of the composition.