Composition for odor suppression
The present disclosure provides a composition. In an embodiment, the composition includes (A) from 85 wt % to 99 wt % of an olefin-based polymer and (B) from 15 wt % to 1 wt % of an odor suppressant. The odor suppressant is a blend of (i) particles of zinc oxide, and (ii) zinc ionomer. The zinc oxide particles have a D50 particle size from 100 nm to 3000 nm, a surface area from 1 m 2 /g to 9 m 2 /g, and a porosity less than 0.020 m 3 /g. The composition has a methyl mercaptan odor suppression value of less than 70 at 3 days as measured in accordance with ASTM D5504-12.
1. A composition comprising:
(A) from 85 wt % to 99 wt % of an olefin-based polymer;
(B) from 15 wt % to 1 wt % of an odor suppressant comprising a blend of:
(i) particles of zinc oxide, the particles having a D50 particle size from 100 nm to 3000 nm, a surface area from 1 m 2 /g to 9 m 2 /g, and a porosity less than 0.020 m 3 /g;
(ii) a zinc ionomer, and
the composition has a methyl mercaptan odor suppression value of less than 70 at 3 days as measured in accordance with ASTM D5504-12.
2. The composition of claim 1 , wherein the olefin-based polymer is an ethylene-based polymer to the exclusion of other polymers.
3. The composition of claim 2 , wherein the ethylene-based polymer is linear low density polyethylene (LLDPE).
4. The composition of claim 1 wherein composition comprises from 0.1 wt % to 9 wt % zinc.
5. The composition of claim 4 wherein the zinc is present to the exclusion of Group 5 to Group 12 metals.
6. The composition of claim 1 , wherein the weight % ratio between particles of zinc oxide (B)(i) to zinc ionomer (B)(ii) is from 3:1 to 1:7 based on total weight of the odor suppressant.
7. The composition of claim 6 wherein the weight % ratio between particles of zinc oxide (B)(i) to zinc ionomer (B)(ii) is from 1:3 to 1:7 based on total weight of the odor suppressant.
8. The composition of claim 7 wherein the odor suppressant is present in an amount from 1 wt % to 10 wt % based on total weight of the composition.
9. The composition of claim 1 , wherein the particles of zinc oxide (B)(i) have a D50 particle size from 100 nm to 3000 nm;
a surface area from 1.0 m 2 /g to 5.0 m 2 /g;
a porosity from 0.010 m 3 /g to 0.015 m 3 /g; and
the composition has a methyl mercaptan odor suppression value of less than or equal to 55 at 3 days.
10. The composition of claim 9 wherein the composition comprises a continuous-phase composed of the ethylene-based polymer and a discontinuous-phase composed of domains of the zinc oxide particles (B)(i) embedded in the zinc ionomer (B)(ii).
11. The composition of claim 9 wherein the domains have an average diameter from 500 nm to 10,000 nm.
12. The composition of claim 1 wherein the zinc ionomer is a zinc salt of a polymer selected from the group of ethylene/methyl-methacrylic acid, ethylene/vinyl acrylic acid, ethylene/methacrylate, ethylene/n-butyl acrylic acid, and ethylene acrylic acid.
13. The composition of claim 1 , wherein the zinc ionomer is a zinc salt of an ethylene/acrylic acid copolymer.