US 12,281,220 B2
Soft propylene copolymer composition
Johan Defoer, Beringen (BE); and Marc Knaepen, Beringen (BE)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/618,739
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Jun. 15, 2020, PCT No. PCT/EP2020/066496
§ 371(c)(1), (2) Date Dec. 13, 2021,
PCT Pub. No. WO2021/004728, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 19184754 (EP), filed on Jul. 5, 2019.
Prior Publication US 2022/0251358 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 23/14 (2006.01); B32B 5/02 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/32 (2006.01)
CPC C08L 23/142 (2013.01) [B32B 5/028 (2013.01); B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/32 (2013.01); B32B 2274/00 (2013.01); B32B 2307/72 (2013.01); B32B 2419/06 (2013.01); B32B 2605/08 (2013.01); C08L 2203/162 (2013.01); C08L 2205/035 (2013.01); C08L 2207/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A propylene copolymer composition comprising:
(A) from 55.0 to 90.0 wt %, based on the total amount of the propylene copolymer composition, of a heterophasic propylene copolymer having a matrix phase and an elastomeric phase dispersed in said matrix phase, wherein the matrix phase is a propylene random copolymer,
the heterophasic propylene copolymer further having a melt flow rate MFR2 of 0.2 to 12.0 g/10 min, determined according to ISO 1133 at a temperature of 230° C. and a load of 2.16 kg, and
a xylene cold solubles (XCS) fraction in the range of from 20.0 to 50.0 wt % based on the total amount of the heterophasic propylene copolymer (A), determined according to ISO 16152 at a temperature of 25° C., and
(B) from 10.0 to 23.0 wt %, based on the total amount of the propylene copolymer composition, of a propylene based plastomer having a density in the range of from 845 to 870 kg/m3, determined according to ASTM D1505 on compression moulded test specimens and a melt flow rate MFR2 of 1.0 to 30.0 g/10 min, determined according to ASTM D1238 at a temperature of 230° C. and a load of 2.16 kg,
wherein the propylene copolymer composition has a tensile modulus of below 300 MPa, determined according to ISO 527-2, measured on injection moulded test specimens, and follows the following inequation:
tensile modulus [MPa]<375 MPa−6×amount of (B)×MPa/wt %,
wherein in the above inequation, the “amount of (B)” represents a numerical value corresponding to the amount of propylene based plastomer (B) in [wt %], based on the total weight of propylene copolymer composition.