Ethylene-based polymer compositions for improved extrusion coatings

Abstract

The invention provides a composition comprising at least the following: a) a first composition comprising at least one first ethylene-based polymer, formed by high pressure, free-radical polymerization, and wherein the first composition comprises the following properties: a melt index (I2) from 1.0 to 15.0 g/10 min, and density from 0.910 to 0.940 g/cc; b) a second composition comprising at least one second ethylene-based polymer, and wherein the second composition comprises the following properties; a melt index (I2) from 1.0 to 1000 g/10 min, a density greater than 0.940 g/cc; wherein the composition comprises the following properties: melt index (I2) from 2.0 to 20.0 g/10 min, and a density from 0.915 to 0.940 g/cc; and wherein the first composition is present in an amount from 65 to 95 wt %, based on the weight of the composition.

1 . A composition comprising at least the following:
 a) a first composition comprising at least one first ethylene-based polymer, formed by high pressure, free-radical polymerization, and wherein the first composition comprises the following properties: a melt index (I2) from 1.0 to 15.0 g/10 min, and density from 0.910 to 0.940 g/cc;   b) a second composition comprising at least one second ethylene-based polymer, and wherein the second composition comprises the following properties: a melt index (I2) from 1.0 to 1000 g/10 min, and a density greater than 0.940 g/cc;   wherein the melt index (I2) ratio of the melt index (I2) of the second composition to the melt index (I2) of the first composition is from 0.50 to 2.70;   wherein the composition comprises the following properties: melt index (I2) from 2.0 to 20.0 g/10 min, and a density from 0.910 to 0.935 g/cc; and   wherein the first composition is present in an amount from 65 to 95 wt %, based on the weight of the composition.   
     
     
         2 . The composition of  claim 1 , wherein the melt index (I2) ratio of “the composition” to “the second composition” is from 0.30 to 2.00. 
     
     
         3 . The composition of  claim 1 , wherein the first ethylene-based polymer is prepared in a tubular reactor. 
     
     
         4 . The composition of  claim 1 , wherein the first composition comprises ≥95 wt % of the first ethylene-based polymer, based on the weight of the first composition. 
     
     
         5 . The composition of  claim 1 , wherein the first ethylene-based polymer is a low density polyethylene (LDPE). 
     
     
         6 . The composition of  claim 1 , wherein the second composition comprises ≥95 wt % of the second ethylene-based polymer, based on the weight of the second composition. 
     
     
         7 . The composition of  claim 1 , wherein the second composition has a density from 0.940 to 0.966 g/cc. 
     
     
         8 . The composition of  claim 1 , wherein the second ethylene-based polymer is a high density polyethylene (HDPE). 
     
     
         9 . The composition of  claim 1 , wherein the melt index (I2) ratio of the composition to the first composition is from 0.50 to 3.00. 
     
     
         10 . The composition of  claim 1 , wherein the first composition has a melt index (I2) from 3.0 to 10.0 g/10 min. 
     
     
         11 . The composition of  claim 1 , wherein the first composition is present in an amount from 75 to 95 wt %, based on the weight of the composition. 
     
     
         12 . The composition of  claim 1 , wherein the second composition has a melt index (I2) from 4.0 to 40.0 g/10 min. 
     
     
         13 . The composition of  claim 1 , wherein the composition has a density from 0.910 to 0.930 g/cc. 
     
     
         14 . The composition of  claim 1 , wherein the first composition, is prepared in a tubular reactor, and has a melt index (I2) from 3.0 to 10.0 g/10 min, and a G′ value (at G″=500 Pa, 170° C.)≥127.5 Pa-1.25 Pa/(g/10 min)×I2. 
     
     
         15 . The composition of  claim 1 , wherein the first composition is prepared in a tubular reactor, and has a melt index (I2) from 3.0 to 10.0 g/10 min, a density from 0.916 to 0.928 g/cc; the second composition has a melt index (I2) from 4.0 to 20.0 g/10 min, a density from 0.955 to 0.970 g/cc; and wherein the composition has a melt index (I2) from 3.0 to 10.0 g/10 min, and a G′(at G″=500 Pa, 170° C.) from 100 to 200 Pa; and wherein the second composition is present in an amount from 10 to 20 wt %, based on the weight of the composition. 
     
     
         16 . The composition of  claim 1 , wherein a coating the composition has a Water Vapor Transmission Rate, WVTR (38° C. 100% RH according to ASTM1249-06, 1 mil coating)≤1.8 (g/100 in 2 /day). 
     
     
         17 . An article comprising at least one component formed from the composition of  claim 1 . 
     
     
         18 . The article of  claim 17 , wherein the article is a coating, a film, a foam, a laminate, a fiber, or a tape.