Ethylene/α-olefin/nonconjugated polyene interpolymer compositions and articles prepared from the same
A composition composed of at least a first ethylene/α-olefin/nonconjugated polyene interpolymer, which can be used to produce low compression set, foamed rubber materials, articles made from the composition, and methods of producing the composition and articles.
1. A first composition comprising:
an in-reactor blend of
(i) from 32 to 38 wt % of a first ethylene/propylene/nonconjugated polyene interpolymer having the following properties
1) a molecular weight distribution (M w /M n , MWD(conv)) from 2.7 to 3.0,
2) a z average molecular weight (Mz) from 900,000 g/mol to 950,000 g/mol,
3) a tan delta (0.1 rad/s, 190° C.) from 1.1 to 1.2,
4) a tan delta (100 rad/s, 190° C.) from 0.2 to 0.3, and
5) an absolute value of a tan delta slope defined as
m
=
[
tandelta
@
0.1
ra
d
/
s
-
tandelta
@
100
ra
d
/
s
]
*
1000
0.1
rad
/
s
-
100
rad
/
s
,
and m is from 9.0 to 10.0, and
(ii) from 68 to 62 wt % of a second ethylene/propylene/nonconiugated polyene interpolymer;
wherein the first composition contains no crosslinking agent and comprises the following properties:
a) a molecular weight distribution (M w /M n , MWD(conv)) from greater than 3.5 to less than 6.0;
b) a z average molecular weight (Mz) from greater than or equal to 900,000 g/mol to less than or equal to 1,000,000 g/mol; and
c) an absolute value of a tan delta slope defined as
m
=
[
tandelta
@
0.1
ra
d
/
s
-
tandelta
@
100
ra
d
/
s
]
*
1000
0.1
rad
/
s
-
100
rad
/
s
,
and m is from 4.0 to 8.0 s/rad.
2. The first composition of claim 1 , wherein the first composition has a tan delta, at 0.1 rad/sec and 190° C., from greater than 1.00 to 1.35.
3. The first composition of claim 1 , wherein the first composition further comprises an oil.
4. The first composition of claim 1 , wherein the first composition has a Mooney Viscosity (ML1+4, 125° C.) from 30 to 70.
5. The first composition of claim 1 , wherein the first composition has a density ≤0.870 g/cc.
6. The first composition of claim 1 , wherein the first interpolymer and the second interpolymer comprise greater than or equal to 95 wt % of the total weight of the first composition.
7. A composition comprising the first composition of claim 1 .
8. An article comprising at least one component formed from the composition of claim 7 .
9. The first composition of claim 1 wherein the first composition has a viscosity at 0.1 rad/sec, 190° C., from greater than 200,000 Pa-s to 300,000 Pa-s.
10. The first composition of claim 9 wherein the first composition has a g′ value from greater than or equal to 0.7 to less than or equal to 0.9.
11. The first composition of claim 10 wherein the first composition comprises from greater than 8 wt % to 10 wt % polyene.
12. The first composition of claim 11 wherein the first composition has a weight average molecular weight (Mw) from greater than or equal to 230,000 g/mol to less than or equal 500,000 g/mol and a molecular weight distribution (M w /M n , MWD(conv)) from greater than 4.0 to less than 6.0.
13. The first composition of claim 12 wherein the first composition comprises from 55 wt % to 60 wt % ethylene.
14. The first composition of claim 13 wherein the first composition has a peak area from 21.3 to 21.8 ppm from greater than 15% to 25%.
15. The first composition of claim 14 wherein the first composition meets the following relationship
tan delta(0.1 rad/s)≥−(6.054×10 −7 mol/g)×Mz+1.25.