US 12,215,208 B2
Polyethylene film for heat sealing
Priya Garg, Geleen (NL); and Maria Soliman, Geleen (NL)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Appl. No. 17/423,242
Filed by SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
PCT Filed Jan. 13, 2020, PCT No. PCT/EP2020/050681
§ 371(c)(1), (2) Date Jul. 15, 2021,
PCT Pub. No. WO2020/148229, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 19152323.2 (EP), filed on Jan. 17, 2019.
Prior Publication US 2022/0064389 A1, Mar. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 210/16 (2006.01); B29C 65/02 (2006.01); B32B 27/32 (2006.01); C08F 2/06 (2006.01); C08F 110/02 (2006.01); C08J 5/18 (2006.01); C08L 23/00 (2006.01); B29L 31/00 (2006.01); C08L 23/08 (2006.01)
CPC C08J 5/18 (2013.01) [B29C 65/02 (2013.01); C08F 2/06 (2013.01); C08F 110/02 (2013.01); B29K 2023/06 (2013.01); B29L 2031/712 (2013.01); B32B 27/32 (2013.01); C08F 210/16 (2013.01); C08F 2500/12 (2013.01); C08F 2500/37 (2021.01); C08F 2500/39 (2021.01); C08J 2323/06 (2013.01); C08L 23/0815 (2013.01); C08L 2203/162 (2013.01)] 15 Claims
 
1. A film comprising at least one sealing layer wherein at least one layer A of the at least one sealing layer comprises a polyethylene comprising moieties derived from ethylene and moieties derived from an α-olefin comprising 4 to 10 carbon atoms, the polyethylene having a density of ≥870 and ≤920 kg/m3 as determined in accordance with ASTM D792 (2013),
wherein the polyethylene has:
a fraction of material that is eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature ≤30.0° C. of ≥5.0 wt % with regard to the total weight of the polyethylene;
a shear storage modulus G′ determined at a shear loss modulus G″=5000 Pa of >700 Pa, G′ and G″ being determined in accordance with ISO 6721-10 (2015) at 190° C.;
a melt mass-flow rate, determined at 190° C. under a load of 2.16 kg in accordance with ASTM D1238 (2013) of ≥2.60 and ≤4.90 g/10 min; and
a chemical composition distribution broadness (CCDB) of ≥15.0,
wherein the CCDB is determined according to formula I:

OG Complex Work Unit Math
wherein
Tn-2 is the moment calculated according to the formula II:

OG Complex Work Unit Math
and
Tz+2 is the moment calculated according to the formula III:

OG Complex Work Unit Math
wherein
w(i) is sampled weight fraction in wt % with regard to a total sample weight in a-TREF analysis of a sample (i) taken at temperature T(i), where T(i)>30° C., an area under an a-TREF curve being normalised to surface area=1 for T(i)>30° C.; and
T(i) is temperature at which sample (i) is taken in a-TREF analysis, in ° C.