	US 12,441,872 B2
	Rotomolding composition
Carmine D'Agostino, Mississauga (CA); Gilbert Arnould, Calgary (CA); Celine Bellehumeur, Calgary (CA); Henry Hay, Calgary (CA); and Van Dang, Calgary (CA)
Assigned to NOVA Chemicals (International) S.A., Fribourg (CH)
Appl. No. 17/799,117
Filed by Nova Chemicals (International) S.A., Fribourg (CH)
PCT Filed Feb. 10, 2021, PCT No. PCT/IB2021/051084 § 371(c)(1), (2) Date Aug. 11, 2022, PCT Pub. No. WO2021/165790, PCT Pub. Date Aug. 26, 2021.
Claims priority of provisional application 62/977,549, filed on Feb. 17, 2020.
Prior Publication US 2023/0124453 A1, Apr. 20, 2023
Int. Cl. C08L 23/0807 (2025.01); C08K 5/00 (2006.01)

CPC C08L 23/0815 (2013.01) [C08K 5/005 (2013.01); C08L 2201/08 (2013.01); C08L 2205/025 (2013.01)]

9 Claims

1. A polyethylene composition comprising:

1) From 85 to 99 weight % of a stabilized polyethylene having a melt index, I₂, as measured by ASTM D 1238 at 190° C. using a 2.16 kg lead, of from 0.5 to 10 grams/10 minutes; a density as measured by ASTM D792 of from 0.920 to 0.950 g/cc; and

2) From 15 to 1 weight % of a substantially non-stabilized polyethylene having (i) a high load melt index, I₂₁, as measured by ASTM D1238 at 190° C. using a 21.6 kg load, of from 2 to 20 grams/10 minutes; (ii) a density of from 0.950 to 0.965 g/cc as measured by ASTM D792; and (iii) an average particle size of from 500 to 3000 microns;

wherein:

the stabilized polyethylene contains a stabilizer package comprising a primary antioxidant and a secondary antioxidant;

the substantially non-stabilized polyethylene contains less than 100 ppm of primary antioxidant and/or secondary antioxidant; and

an average particle size of said stabilized polyethylene is smaller than the average particle size of said substantially non-stabilized polyethylene.