US 12,351,704 B2
Use of recycled polyethylene in closures for bottles
XiaoChuan Wang, Calgary (CA); Brant Wunderlich, Calgary (CA); Derek Wasylenko, Calgary (CA); Tony Tikuisis, Calgary (CA); and Gilbert Arnould, Calgary (CA)
Assigned to NOVA Chemicals (International) S.A., Fribourg (CH)
Appl. No. 17/766,679
Filed by NOVA Chemicals (International) S.A., Fribourg (CH)
PCT Filed Oct. 13, 2020, PCT No. PCT/IB2020/059603
§ 371(c)(1), (2) Date Apr. 5, 2022,
PCT Pub. No. WO2021/074785, PCT Pub. Date Apr. 22, 2021.
Claims priority of provisional application 62/915,730, filed on Oct. 16, 2019.
Prior Publication US 2024/0093007 A1, Mar. 21, 2024
Int. Cl. C08L 23/06 (2006.01)
CPC C08L 23/06 (2013.01) [C08L 2203/10 (2013.01); C08L 2205/025 (2013.01); C08L 2205/24 (2013.01); C08L 2207/062 (2013.01); C08L 2207/20 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A polyethylene blend comprising:
from 1 wt. % to 50 wt. % recycled polyethylene; and
from 50 wt. % to 99 wt. % of a bimodal polyethylene composition comprising:
10 wt. % to 70 wt. % of a first ethylene copolymer having a melt index I2, of less than 0.4 g/10 min; a molecular weight distribution, Mw/Mn, of less than 2.7; and a density from 0.920 g/cm3 to 0.955 g/cm3; and
30 wt. % to 90 wt. % of a second ethylene copolymer having a melt index I2, from 100 to 20,000 g/10 min; a molecular weight distribution Mw/Mn, of less than 2.7; and a density higher than the density of the first ethylene copolymer, but less than 0.967 g/cm3;
wherein the recycled polyethylene has a density from 0.916 g/cm3 to 0.970 g/cm3 as measured by ASTM D792, and a melt index, I2, as determined by ASTM D1238at 190° C. using a 2.16 kg load from 0.3 to 30 g/10 minutes; and
wherein the bimodal polyethylene composition has a density from 0.930 g/cm3 to 0.970 g/cm3 as measured by ASTM D792, and a melt index, I2, as determined by ASTM D1238 at 190° C. using a 2.16 kg load from 0.1 to 12 g/10 minutes, and a B10ESCR as determined by ASTM D1693 from 10 to 2000.