Extrusion coating composition
Multimodal polyethylene compositions are provided. Extrusion compositions including the multimodal polyethylene are provided. The extrusion composition further include a high pressure low density polyethylene and optionally other additives and/or polyethylenes. Extruded articles made from the polyethylene extrusion compositions are also provided.
1. An extrusion composition comprising from 80% to 98% a multimodal polyethylene and 2% to 20% LDPE wherein the multimodal polyethylene is characterized by:
a. M w (abs)/M w (RI)>1.05 and <1.6;
b. M z (measured)/ M z (calc)>1.4 and <3.0 where M z (calc) is calculated from the measured I 2 according to M z (calc)=1.5*10 (5.077−0.284*log 10)(I 2 )) ;
c. I 2 >8.0 g/10 minutes and <15.0 g/10 minutes;
d. CDF(RI fraction)>0.01 at a log 10(M w ) of 5.5; and
e. density in the range 0.860-0.965 g/cc; and
the LDPE is characterized by having a I 2 less than 10 g/10 minutes and greater than 0.2 g/10 minutes, and a M w (abs)/M w (RI)>2.0.
2. The extrusion composition of claim 1 wherein the composition comprises from 91% to 97% multimodal polyethylene and 3% to 9% LDPE and further wherein the multimodal polyethylene is characterized by:
a. M w (abs)/M w (RI)>1.10 and <1.20;
b. M z (measured)/ M z (calc)>1.5 and <2.5;
c. I 2 >9.0 g/10 minutes and <12.0 g/10 minutes;
d. CDF(RI fraction)>0.02 at a log 10(M w ) of 5.5; and
e. MWD>3.0 and <3.5; and
the LDPE is characterized by having a I 2 less than 1.0 g/10 minutes and greater than 0.3 g/10 minutes, and the M w (abs)/M w (RI) is >3.2.
3. An article comprising at least one layer of an ethylene polymer extrusion composition, wherein the extrusion composition comprises from 80% to 98% multimodal polyethylene and 2% to 20% LDPE wherein the multimodal polyethylene is characterized by:
a. M w (abs)/M w (RI)>1.05 and <1.6;
b. M z (measured)/ M z (calc)>1.4 and <3.0 where M z (calc) is calculated from the measured I 2 according to M z (calc)=1.5*10 (5.077−0.284*log 10(I 2 )) ;
c. I 2 >9.0 g/10 minutes and <15.0 g/10 minutes;
d. CDF (RI fraction)>0.01 at a log 10(M w ) of 5.5; and
e. density in the range 0.860-0.965 g/cc; and
the LDPE is characterized by having a I 2 less than 10 g/10 minutes and greater than 0.2 g/10 minutes, and a M w (abs)/M w (RI)>2.0.
4. The article of claim 3 , wherein the article is in the form of an extrusion profile, an extrusion coating onto a substrate or an extrusion cast film.
5. The article of claim 4 wherein the article is an extrusion coating onto a substrate and the substrate is a woven or non-woven fabric.
6. The article of claim 3 , wherein the at least one layer of an ethylene polymer composition is a sealant layer, adhesive layer, abuse resistance layer, or release surface.
7. The article of claim 6 wherein the article is a sealant layer and wherein the density of the multimodal polyethylene is <0.915 g/cc.
8. The article of claim 6 wherein the article is a release surface wherein density of the multimodal polyethylene is >0.940 g/cc.