US 9,809,703 B2
Ethylene-based polymer compositions with improved viscosities
Brian W. Walther, Clute, TX (US); Timothy E. Clayfield, Waedenswil (CH); and Curvel Hypolite, Rosharon, TX (US)
Assigned to DOW GLOBAL TECHNOLOGIES LLC, Midland, MI (US)
Appl. No. 14/368,980
Filed by Brian W. Walther, Clute, TX (US); Timothy E. Clayfield, Waedenswil (CH); and Curvel Hypolite, Rosharon, TX (US)
PCT Filed Dec. 27, 2012, PCT No. PCT/US2012/071828
§ 371(c)(1), (2) Date Jun. 26, 2014,
PCT Pub. No. WO2013/101933, PCT Pub. Date Jul. 4, 2013.
Claims priority of provisional application 61/581,135, filed on Dec. 29, 2011.
Prior Publication US 2014/0378602 A1, Dec. 25, 2014
Int. Cl. C08L 23/00 (2006.01); C08L 23/16 (2006.01); C08L 23/08 (2006.01)
CPC C08L 23/16 (2013.01) [C08L 23/0807 (2013.01); C08L 23/0815 (2013.01); C08L 2205/02 (2013.01); C08L 2205/025 (2013.01)] 12 Claims
 
1. A composition comprising a first composition comprising the following:
A) a first ethylene/propylene/non-conjugated diene interpolymer (EPDM(1)) that has a weight average molecular weight (Mw) greater than 90,000 g/mole and a MWD from 2.12 to 2.29, each as determined by conventional GPC;
B) a second ethylene/propylene/non-conjugated diene interpolymer (EPDM(2)) that has a weight average molecular weight (Mw) less than, or equal to, 4000 g/mole and a MWD from 1.95 to 2.29; and
wherein the first composition has a number average molecular weight (Mn) less than 10,000 g/mole as determined by conventional GPC; and
wherein the weight ratio of the component A) to the component B) is from 8/2 to 1/1; and
wherein the first composition has a weight average molecular weight (Mw) greater than, or equal to, 100,000 g/mole; and
wherein the first composition has a density from 0.855 g/cc to 0.910 g/cc, and a melt index (I2) less than, or equal to, 10 g/10 min; and
wherein the weight ratio of the ethylene content in the second ethylene/propylene/non-conjugated diene interpolymer to the ethylene content in the first ethylene/propylene/non-conjugated diene interpolymer (EE(2)/EE(1)) is from 0.90 to 1.10, and wherein the absolute difference in the propylene content of the first ethylene/propylene/non-conjugated diene interpolymer and the second ethylene/propylene/non-conjugated diene interpolymer is less than 5 weight percent, wherein each weight percent is based on the weight of the respective interpolymer; and
wherein the first composition has a MWD greater than, or equal to, 50, and less than, or equal to, 200.