US 12,460,069 B2
Foaming behaviour of polymer compositions using passive nucleation
Asa Wannerskog, Stenungsund (SE); Anna Hjartfors, Stenungsund (SE); Oscar Prieto, Stenungsund (SE); Martin Anker, Stenungsund (SE); and Ann Watson, Arbroath (GB)
Assigned to BOREALIS GMBH, Vienna (AT)
Appl. No. 17/414,374
Filed by Borealis AG, Vienna (AT)
PCT Filed Dec. 3, 2019, PCT No. PCT/EP2019/083556
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/126487, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18215274 (EP), filed on Dec. 21, 2018.
Prior Publication US 2022/0064419 A1, Mar. 3, 2022
Int. Cl. C08L 23/06 (2006.01); C08J 9/12 (2006.01); H01B 3/44 (2006.01); C08K 3/26 (2006.01); C08K 3/34 (2006.01); C08K 3/36 (2006.01); H01B 11/02 (2006.01); H01B 11/18 (2006.01)
CPC C08L 23/06 (2013.01) [C08J 9/122 (2013.01); H01B 3/441 (2013.01); C08K 2003/265 (2013.01); C08K 3/34 (2013.01); C08K 3/346 (2013.01); C08K 3/36 (2013.01); C08L 2203/14 (2013.01); C08L 2203/202 (2013.01); C08L 2205/025 (2013.01); C08L 2207/062 (2013.01); C08L 2207/066 (2013.01); H01B 11/02 (2013.01); H01B 11/18 (2013.01)] 13 Claims
 
1. A cable comprising at least one layer which comprises a foamable polymer composition, the foamable polymer composition comprising:
(A) a first polyolefin polymer which is a high-density polyethylene,
(B) a second polyolefin polymer which is an autoclave low density polyethylene having an MFR2 (2.16 kg; 190° C.) of 2 to 15 g/10 min measured according to ISO 1133-1, and
(C) a mineral nucleating agent in an amount of 0.5 to 6 wt % based on a total foamable polymer composition,
wherein the first polyolefin polymer (A) has a higher density than the second polyolefin polymer (B);
wherein the foamable polymer composition does not comprise hydrazine, hydrazide or azodicarbonamide (ADCA); and
wherein the first polyolefin polymer (A) is present in amount of 20 to 95 wt % based on the total foamable polymer composition and wherein the second polyolefin polymer (B) is present in an amount of 5 to 80 wt % based on the total foamable polymer composition; and
wherein the foamable polymer composition has a dissipation factor at 1.9 GHz of between 80·10−6 to 270·10−6.