US 12,441,873 B2
Polymer formulations and irrigation tubing including polymer formulations
Felipe D. Barbosa, Sao Paulo (BR); Marcela E. Laporta, Perto Madero (AR); Jorge C. Gomes, Sao Paulo (BR); Nicolas C. Mazzola, Sao Paulo (BR); and Davidson Lutkenhaus, Sao Paulo (BR)
Assigned to Dow Global Technologies LLC, Midland, MI (US); and PBBPolisur S.R.L., Buenos Aires (AR)
Appl. No. 17/999,658
Filed by Dow Global Technologies LLC, Midland, MI (US); and PBBPolisur S.R.L., Buenos Aires (AR)
PCT Filed May 21, 2021, PCT No. PCT/US2021/033521
§ 371(c)(1), (2) Date Nov. 22, 2022,
PCT Pub. No. WO2021/242619, PCT Pub. Date Dec. 2, 2021.
Claims priority of provisional application 63/030,471, filed on May 27, 2020.
Prior Publication US 2023/0212378 A1, Jul. 6, 2023
Int. Cl. C08L 23/06 (2006.01); C08F 2/06 (2006.01); C08F 210/16 (2006.01); C08L 23/0807 (2025.01); C08F 4/64 (2006.01); C08F 4/654 (2006.01)
CPC C08L 23/0815 (2013.01) [C08F 2/06 (2013.01); C08F 210/16 (2013.01); C08L 23/06 (2013.01); C08F 4/64193 (2013.01); C08F 4/654 (2013.01); C08L 2203/18 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01); C08L 2205/05 (2013.01); C08L 2310/00 (2013.01); C08L 2314/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A polyethylene formulation comprising:
from 45 weight percent (wt %) to 90 wt. % of a medium density polyethylene (MDPE) having a density of from 0.930 grams per cubic centimeter (g/cc) to 0.950 g/cc and a melt index (I2) from 0.05 grams per ten minutes (g/10 min) to 0.5 g/10 min;
from 10 wt % to 50 wt % of a polyethylene composition having a density from 0.910 g/cc to 0.936 g/cc and a melt index (I2) from 0.25 g/10 min to 2.0 g/10 min; and
from 0.5 wt % to 5 wt % of a masterbatch composition;
wherein the polyethylene composition comprises:
a first polyethylene fraction area in a temperature range of 45° C. to 87° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein the first polyethylene fraction area comprises at least 50% of a total area of the elution profile;
a second polyethylene fraction area in a temperature range of 95° C. to 120° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein the second polyethylene fraction area comprises less than or equal to 23% of the total area of the elution profile; and
wherein a ratio of the first polyethylene fraction area to the second polyethylene fraction area is 2.9 to 12.5.