	US 12,448,503 B2
	Neck-in suppression for tubular LDPE based polymers for extrusion coating at medium and high line speed
Eva-Maria Kupsch, Waedenswil (CH); Yifan Dong, Lake Jackson, TX (US); and Sylvie Vervoort, Ghent (BE)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/631,091
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jul. 24, 2020, PCT No. PCT/US2020/043485 § 371(c)(1), (2) Date Jan. 28, 2022, PCT Pub. No. WO2021/021625, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/880,832, filed on Jul. 31, 2019.
Prior Publication US 2022/0251352 A1, Aug. 11, 2022
Int. Cl. C08L 23/06 (2006.01); C09D 123/06 (2006.01)

CPC C08L 23/06 (2013.01) [C09D 123/06 (2013.01); C08L 2203/16 (2013.01); C08L 2207/066 (2013.01)]

10 Claims

1. A coated polymer substrate comprising:

a polymer substrate;

a coating comprising a polymer blend; and

a tie layer disposed between the polymer substrate and the coating;

wherein the polymer blend comprises:

at least 90% by weight low density polyethylene (LDPE) polymer; and

from 1% to 10% by weight ethylene acrylate copolymer, wherein the ethylene acrylate copolymer is the polymerized reaction product of:

at least 75% by wt. ethylene, based on the total wt. % of the monomers present in the ethylene acrylate copolymer;

from 12% to 25% by wt. of alkyl acrylate, based on the total wt. % of the monomers present in the ethylene acrylate copolymer; and

0 wt. % of monocarboxylic acid monomer, based on the total wt. % of the monomers present in the ethylene acrylate copolymer; and

wherein the ethylene acrylate copolymer has a melt index (I₂) from 4 g/10 mins to 10 g/10 mins as determined in accordance with ASTM D1238 (190° C. 2.16 kg).