Composition for Odor Suppression for Post Consumer Resin

Abstract

The present disclosure provides a composition. In an embodiment, the composition includes a polymer component and an odor suppressant. The polymer component includes (i) a post-consumer resin and (ii) optionally an olefin-based polymer. The composition further includes from 0.15 wt % to 15 wt % of the odor suppressant. The odor suppressant includes (i) from 0.05 wt % to 2 wt % of a metal oxide having a band gap greater than 5.0 electron volts (eV); and (ii) from 0.1 wt % to 13 wt % an acid copolymer. The ratio of metal oxide to acid copolymer is from 1:20 to 1:1. Weight percent is based on total weight of the composition.

Claims

1. A composition comprising: a polymer component comprising (i) a post-consumer resin (PCR) and (ii) optionally an olefin-based polymer; from 0.15 wt % to 15 wt % of an odor suppressant based on total weight of the composition, the odor suppressant comprising (i) from 0.05 wt % to 2 wt % based on total weight of the composition of a metal oxide having a band gap greater than 5.0 electron volts (eV); and (ii) from 0.1 wt % to 13 wt % based on total weight of the composition of an acid copolymer; and the ratio of metal oxide to acid copolymer is from 1:20 to 1:1.

2. The composition of claim 1 wherein the composition exhibits at least a 20% reduction in volatile hetero-carbonyl species compared to the polymer component without the odor suppressant as measured by normalized gas chromatography.

3. The composition of claim 1 wherein the polymer component comprises 100 wt % post-consumer resin based on the total weight of the polymer component.

4. The composition of claim 1 wherein the polymer component comprises from 5 wt % to 95 wt % PCR and from 95 wt % to 5 wt % of the olefin-based polymer.

5. The composition of claim 1 wherein the olefin-based polymer is selected from the group consisting of ethylene-based polymer, propylene-based polymer, and combinations thereof.

6. The composition of claim 1 wherein the metal oxide is selected from the group consisting of calcium oxide and magnesium oxide.

7. The composition of claim 1 wherein the acid polymer is selected from the group consisting of ethylene ethyl acrylate copolymer, ethylene butyl acrylate copolymer, ethylene acrylic acid copolymer, ethylene/(meth)acrylic acid copolymer, and combinations thereof.

8. The composition of claim 1 wherein the odor suppressant is a pre-blend of the metal oxide particles dispersed in the acid copolymer.

9. The composition of claim 1 wherein the metal oxide is particles of calcium oxide.

10. The composition of claim 1 wherein the acid copolymer is ethylene acrylic acid.

11. A process comprising: a polymer component comprising (i) a post-consumer resin and (ii) optionally an olefin-based polymer, the polymer component having an amount of at least one volatile hetero-carbonyl species; adding to the polymer component from 0.15 wt % to 15 wt % of an odor suppressant comprising (i) from 0.05 wt % to 2 wt % based on total weight of the composition of a metal oxide having a band gap greater than 5.0 electron volts (eV), and (ii) from 0.1 wt % to 13 wt % based on total weight of the composition of an acid copolymer, the ratio of metal oxide to acid copolymer is from 1:20 to 1:1 to form an odor-reduced composition; and neutralizing, with the odor suppressant, at least some of the volatile hetero-carbonyl species to form an odor-reduced composition.

12. The process of claim 11 comprising forming an odor-reduced composition exhibiting at least a 20% reduction in the amount of a volatile hetero-carbonyl species compared to the polymer component, without the odor suppressant as measured by normalized gas chromatography.

13. The process of claim 11 comprising dispersing, before the adding, particles of the metal oxide in the acid copolymer to form an odor suppressant pre-blend; adding the odor suppressant pre-blend to the polymer component; and forming the odor-reduced composition.

Description

DETAILED DESCRIPTION

[0043] The present disclosure provides a composition. In an embodiment, a composition for suppressing odors is provided and includes a polymer component and an odor suppressant. The polymer component includes a post-consumer resin (PCR) and optionally an olefin-based polymer. The composition includes from 0.15 wt % to 15 wt % of the odor suppressant based on total weight of the composition. The odor suppressant includes (i) from 0.05 wt % to 2 wt % based on total weight of the composition of a metal oxide having a band gap greater than 5.0 electron volts (eV). The odor suppressant further includes (ii) from 0.1 wt % to 13 wt % based on total weight of the composition of an acid copolymer. The ratio of metal oxide to acid copolymer is from 1:20 to 1:1.

[0044] A(i). Post-Consumer Resin

[0045] The polymer component of the present composition includes a post-consumer resin (PCR). The PCR contains an amount of volatile hetero-carbonyl species. The term “post consumer resin” or “PCR” is a polymeric material that has been previously used as consumer packaging or industrial packaging. In other words, PCR is waste plastic. PCR is typically polyolefin, and polyethylene in particular. PCR typically includes HDPE packaging such as bottles (milk jugs, juice containers), LDPE/LLDPE packaging such as films. PCR also includes residue from its original use, residue such as paper, adhesive, ink, nylon, ethylene vinyl alcohol (EVOH), polyethylene terephthalate (PET), and other odor causing agents.

[0046] Nonlimiting examples of suitable PCR include PCR sold by Envision Plastics, North Carolina, USA, under the tradenames EcoPrime™, PRISMA™, Natural HDPE PCR Resins, Mixed Color and Black HDPE PCR Resins; PCR sold by KW Plastics, Alabama, USA under the following tradenames KWR101-150, KWR101-150-M5-BLK, KWR101-150-M10 BLK, KWR102-8812 BLK, KWR102, KWR102LVW, KWR105, KW620, KWR102-M4, KWR-105M2, KWR105M4, KWR621 FDA, KWR621-20-FDA, KW308A, KW621, KW621-T10, KW621-T20, KW622-20, KW622-35, KW627C, KW1250G, and KWBK10-NB.

[0047] In an embodiment, the polymer component is composed of 100 wt % PCR, wherein weight percent is based on the total weight of the polymer component.

[0048] A(ii). Olefin-Based Polymer

[0049] In addition to the PCR, the polymer component may optionally include an olefin-based polymer. In an embodiment, the olefin-based polymer can be a propylene-based polymer or an ethylene-based polymer. The olefin-based polymer may or may not contain an amount of volatile hetero-carbonyl species. Nonlimiting examples of propylene-based polymer include propylene copolymer, propylene homopolymer, and combinations thereof. In an embodiment, the propylene-based polymer is a propylene/α-olefin copolymer. Nonlimiting examples of suitable α-olefins include C.sub.2 and C.sub.4-C.sub.20 α-olefins, or C.sub.4-C.sub.10 α-olefins, or C.sub.4-C.sub.8 α-olefins. Representative α-olefins include ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene and 1-octene.

[0050] In an embodiment, the propylene/α-olefin copolymer is a propylene/ethylene copolymer containing greater than 50 wt % units derived from propylene, or from 51 wt %, or 55 wt %, or 60 wt % to 70 wt %, or 80 wt %, or 90 wt %, or 95 wt %, or 99 wt % units derived from propylene, based on the weight of the propylene/ethylene copolymer. The propylene/ethylene copolymer contains a reciprocal amount of units derived from ethylene, or from less than 50 wt %, or 49 wt %, or 45 wt %, or 40 wt % to 30 wt %, or 20 wt %, or 10 wt %, or 5 wt %, or 1 wt %, or 0 wt % units derived from ethylene, based on the weight of the propylene/ethylene copolymer.

[0051] In an embodiment, the olefin-based polymer is an ethylene-based polymer. The ethylene-based polymer can be an ethylene homopolymer or an ethylene/α-olefin copolymer.

[0052] In an embodiment, the ethylene-based polymer is an ethylene/α-olefin copolymer. Nonlimiting examples of suitable α-olefins include C.sub.3-C.sub.20 α-olefins, or C.sub.4-C.sub.10 α-olefins, or C.sub.4-C.sub.8 α-olefins. Representative α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene and 1-octene.

[0053] In an embodiment, the ethylene/α-olefin copolymer is an HDPE that is an ethylene/C.sub.4-C.sub.8 α-olefin copolymer. The HDPE has one, some, or all of the following properties:

[0054] (i) a density from 0.940 g/cc to 0.960 g/cc; and/or

[0055] (ii) a Tm from 128° C. to 132° C.; and/or

[0056] (iii) a melt index from 0.5 g/10 min to 2.0 g/10 min.

[0057] A nonlimiting example of a suitable HDPE is DMDA-1250 available from DowDuPont.

[0058] In an embodiment, the polymer component includes PCR blended with an olefin-based polymer that is not a PCR. In other words, the PCR is blended with a “virgin olefin-based polymer.” The virgin olefin-based polymer may or may not contain an amount of volatile hetero-carbonyl species. The polymer component may contain from 5 wt %, or 20 wt %, or 30 wt %, or 40 wt %, or 50 wt % to 60 wt %, or 70 wt %, or 80 wt %, or 95 wt % PCR and a reciprocal amount of virgin olefin-based polymer or from 95 wt %, or 80 wt %, or 70 wt %, or 60 wt %, or 50 wt % to 40 wt %, or 30 wt %, or 20 wt %, or 5 wt % virgin olefin-based polymer.

[0059] B. Odor Suppressant

[0060] The present composition includes an odor suppressant. The odor suppressant is a blend of metal oxide (Bi) and an acid copolymer (Bii).

[0061] B(i) Metal Oxide

[0062] The odor suppressant includes a metal oxide. The metal oxide has a band gap greater than 5.0 electron volts (eV). A “band gap,” as used herein, is an energy range in a solid where no electron states exist. The band gap is the energy required to promote a valence electron to a conduction electron, which is free to move within the crystal lattice and serve as a charge carrier to conduct electric current. An “electron volt” or “eV,” is a unit of energy equal to approximately 1.6×10.sup.−19 joules. Band gap for metal oxides are described in detail in Surface and Nanomolecular Catalysis, Ryan Richards (ed), Taylor & Francis 2006, the contents of which are incorporated by reference herein.

[0063] Bounded by no particular theory, it is believed that a large band gap (i.e., greater than 5.0 eV) translates to a bond with very little covalent character in which electrons are shared disproportionately. This may result in metal ions in the lattice with a net positive charge and oxide ions with a net negative charge. The magnitude of the charge can therefore be proportional to the band gap. The electron-starved metal ions may consequently be free to act as Lewis acids, accepting electrons from slightly basic moieties present in the volatile hetero-carbonyl odorant molecules. Additionally, the crystalline oxide ions may be able to act as Lewis bases donating electrons into slightly acidic moieties in the volatile hetero-carbonyl odorant molecules.

[0064] Table A below provides band gap values for several metal oxides from Surface and Nanomolecular Catalysis, Ryan Richards (ed), Taylor & Francis 2006.

TABLE-US-00001 TABLE A Band gap thresholds for some metal oxides Metal oxide Band gap (eV) MgO 7.7 CaO 6.9 SrO 5.3 BaO 4.4 ZnO ~3.2 TiO.sub.2 ~3.2 Al.sub.2O.sub.3 ~7 CuO 1.2 Cu.sub.2O 2.1

[0065] In an embodiment, the metal oxide is in the form of particles (powder), has a band gap greater than 5.0 eV and the metal oxide is selected from calcium oxide (CaO), magnesium oxide (MgO), strontium oxide (SrO), aluminum oxide Al.sub.2O.sub.3, and combinations thereof.

[0066] In an embodiment, the metal oxide is in the form of particles (powder) and has a band gap greater than 6.0 eV. In a further embodiment, the metal oxide is selected from calcium oxide (CaO), magnesium oxide (MgO), and combinations thereof. In yet a further embodiment, the metal oxide is calcium oxide (CaO).

[0067] In an embodiment, the metal oxide is calcium oxide (6.9 eV), in the form of particles (powder), the calcium oxide powder having a D50 particle size from 100 nm, or 125 nm, or 150 nm to 250 nm, or 500 nm, or 1000 nm, or 3000 nm. In a further embodiment, the calcium oxide powder has a D50 from 100 nm to 3000 nm, or from 125 nm to 1000 nm, or from 150 nm to 500 nm, or from 175 nm to 250 nm, or from 125 to 160 nm, or from 150 to 160 nm.

[0068] In an embodiment, the metal oxide is hygroscopic and includes surface bound moisture. In a further embodiment, the metal oxide is CaO.H.sub.2O.

[0069] B(ii) Acid Copolymer

[0070] The odor suppressant includes an acid copolymer along with the metal oxide. The term “acid copolymer,” (or “AC”) as used herein, is a copolymer containing (i) ethylene monomer and (ii) a carboxylic acid comonomer or ester derivative thereof (hereafter referred to as “acid comonomer”). The acid copolymer contains the acid comonomer in an amount from 1 wt %, or 5 wt %, or 10 wt %, or 15 wt % to 20 wt %, or 25 wt %, or 30 wt % and a reciprocal wt % amount of ethylene monomer. It is understood that the acid copolymer contains greater than 50 wt %, or greater than 60 wt % ethylene monomer. In a further embodiment, the acid copolymer includes from 1 wt % to 30 wt % acid comonomer (and reciprocal amount ethylene), or from 5 wt % to 30 wt % acid comonomer (and reciprocal amount ethylene), or from 10 wt % to 25 wt % acid comomomer (with reciprocal amount of ethylene), or from 15 wt % to 20 wt % acid comonomer (and reciprocal amount ethylene), or from 5 wt % to 10 wt % acid comonomer (with reciprocal amount ethylene).

[0071] In an embodiment, the acid comonomer is an acrylate-based moiety. Nonlimiting examples of suitable acid copolymers wherein the acid comonomer is an acrylate-based moiety include ethylene ethyl acrylate copolymer (EEA), ethylene butyl acrylate copolymer (EBA), ethylene acrylic acid copolymer (EAA), ethylene/(meth)acrylic acid copolymer (EMA), and combinations thereof.

[0072] In an embodiment, the acid copolymer is an ethylene/acrylic acid copolymer having from 5 wt % to 30 wt % acrylic acid comonomer. Nonlimiting examples of suitable acid copolymers include Nucrel® polymers, available from E. I. du Pont de Nemours and Company (Wilmington, Del.).

[0073] In an embodiment, the odor suppressant is a pre-blend of the metal oxide powder dispersed in the acid copolymer. Mechanical blending and/or melt blending can be used to homogeneously disperse the metal oxide particles throughout the acid copolymer. The pre-blend that is the odor suppressant is subsequently added to the polymer component (A).

[0074] C. Composition

[0075] In an embodiment, the present composition includes (A) from 85 wt % to 99.85 wt % of the polymer component and (B) from 15 wt %, or 13 wt %, or 11 wt %, or 10 wt %, or 9 wt %, or 7 wt %, or 5 wt % to 2 wt %, or 1 wt %, or 0.6 wt %, or 0.5 wt %, or 0.3 wt %, or 0.2 wt %, 0.15 wt % of the odor suppressant. The odor suppressant is mixed, or otherwise is blended, into the polymer component matrix. The odor suppressant contains (i) from 0.05 wt %, or 0.1 wt %, or 0.15 wt %, or 0.2 wt %, or 0.25 wt %, or 0.3 wt %, or 0.4 wt %, or 0.5 wt %, or 0.7 wt %, or 0.9 wt % to 1.0 wt %, or 1.5 wt %, or 2 wt % of particles of the metal oxide (with band gap greater than 5.0 eV); and (ii) from 0.1 wt %, or 0.5 wt %, or 1.0 wt %, or 3 wt %, or 5 wt %, or 7 wt %, or 9 wt % to 10 wt %, or 11 wt %, or 13 wt % of the acid copolymer. Weight percents are based on total weight of the composition. The ratio of metal oxide to acid copolymer is from 1:20, or 1:15, or 1:10, or 1:8, or 1:6 to 1:4, or 1:2, or 1:1. The composition exhibits at least a 5% reduction in at least one volatile hetero-carbonyl species compared to the polymer component without the odor suppressant (i.e., the polymer component alone).

[0076] The reduction in volatile hetero-carbonyl species is a quantitative comparison of (i) the amount of a pre-determined volatile hetero-carbonyl species present in the polymer component (i.e., the polymer component (A) without any odor suppressant) to (ii) the amount of the pre-determined volatile hetero-carbonyl species in the present composition composed of (A) the polymer component and (B) the odor suppressant. The reduction in volatile hetero-carbonyl species is measured by normalized gas chromatography as previously disclosed herein.

[0077] A “volatile hetero-carbonyl species,” as used herein, is a hydrocarbon compound having from 1 carbon atom to 16 carbon atoms (i) and contains at least one heteroatom selected from S, O, N, and/or P, (ii) and has a molecular weight from 30 Daltons to 250 Daltons, (iii) and has a vapor pressure greater than 0.01 millimeters mercury (mm Hg) at standard temperature and pressure, or “STP.” In an embodiment, the volatile hetero-carbonyl species has a C—O bond and/or a C═O bond. Nonlimiting examples of volatile hetero-carbonyl species include volatile C.sub.1-C.sub.16 aldehydes, volatile C.sub.1-C.sub.16 ketones, volatile C.sub.1-C.sub.16 carboxylic acids, volatile C.sub.1-C.sub.16 esters, volatile C.sub.1-C.sub.16 alcohols, volatile C.sub.1-C.sub.16 ethers and combinations thereof.

[0078] Nonlimiting examples of volatile C.sub.1-C.sub.16 aldehydes include formaldehyde, acetalaldehyde, propanal, hexanal, furfural, heptanal, benzaldehyde, octanal, nonanal, decanal, undecanal, and combinations thereof.

[0079] Nonlimiting examples of volatile C.sub.3-C.sub.16 ketones include 2-pentanone, 2-hexanone, 2-octanone, 2-nonanone, 2-decanone, 2-acetophenone, 2-undecanone, and combinations thereof.

[0080] Nonlimiting examples of volatile C.sub.1-C.sub.16 carboxylic acids include hexanoic acid, butyric acid, heptanoic acid, octanoic acid, benzoic acid, nonanoic acid, decanoic acid, and combinations thereof.

[0081] Nonlimiting examples of volatile C.sub.1-C.sub.16 alcohols include methanol, ethanol, propanol, 2-methyl butanol, and combinations thereof.

[0082] Nonlimiting examples of volatile C.sub.1-C.sub.16 ethers include tetrahydrofuran (THF) and alkyl derivatives thereof.

[0083] In an embodiment, the composition includes (A) from 97 wt % to 98.9 wt % of a polymer component. The composition includes from 3 wt %, or 2.8 wt % to 1.1 wt % of the odor suppressant wherein the odor suppressant contains (Bi) metal oxide that is particles of CaO in an amount from 0.01 wt %, or 0.05 wt %, or 0.07 wt % to 0.5 wt %, or 0.7 wt %, or 0.9 wt % and (Bii) acid copolymer in an amount from 0.1, or 0.2, or 0.5, or 0.7, or 0.9 to 1.0, or 1.3, or 1.5, or 1.7, or 1.9 and the ratio of metal oxide to acid copolymer is from 1:10, or 1:8, or 1:6 to 1:4, or 1:2, or 1:1. Weight percents are based on the total weight of the composition. The composition exhibits at least a 20% reduction in at least one volatile hetero-carbonyl species compared to the polymer component (A) without the odor suppressant. The reduction in volatile hetero-carbonyl species is measured by normalized gas chromatography.

[0084] In an embodiment, the composition includes (A) from 98.5 wt % to 99.0 wt % of a polymer component. The composition includes from 1.5 wt %, or 1.3 wt % to 1.1 wt %, or 1.0 wt % of the odor suppressant wherein the odor suppressant contains (Bi) metal oxide that is particles of CaO in an amount from 0.05 wt %, or 0.08 wt % to 0.1 wt %, or 0.13 wt %, or 0.15 wt % and (Bii) acid copolymer that is an ethylene/acrylic acid copolymer in an amount from 1.0 wt %, or 1.1 wt % to 1.2 wt %, or 1.3 wt % and the ratio of metal oxide to acid copolymer is from 1:15, or 1:12 to 1:10, or 1:8 and is hereafter referred to as composition1. Weight percents are based on total weight of the composition. Composition1 exhibits from 10% to 35% reduction in at least one volatile hetero-carbonyl species after an exposure period of 20 hours compared to the olefin-based polymer (A) without the odor suppressant. The reduction in volatile hetero-carbonyl species is measured by normalized gas chromatography.

[0085] In an embodiment, composition1 includes (A) 98.9 wt % polymer component and 1.1 wt % of the odor suppressant. The polymer component (A) is 90 wt % ethylene-based polymer blended with 10 wt % PCR. The odor suppressant contains (Bi) metal oxide that is particles of CaO in an amount of 0.1 wt % and (Bii) acid copolymer that is an ethylene/acrylic acid copolymer in an amount of 1.0 wt %, and the ratio of metal oxide to acid copolymer is 1:10. Composition1 exhibits greater than 20% reduction in aldehydes compared to the amount of aldehydes present in the polymer component (A) alone. The percent reduction in aldehydes is measured by normalized gas chromatography.

[0086] D. Applications

[0087] The present composition may be used in any application wherein the presence of odor or taste causing agents from polymeric material, and an olefin-based polymer in particular, would be used for consumer applications. Nonlimiting examples of suitable applications for the present composition include vehicle interiors, fabrics, and food packaging including caps, closures, wraps and bottle.

[0088] Surprisingly, the present composition (i.e., composition 1) exhibits the same, or better, odor suppression capability without compromising processability and without compromising film properties. Applicant discovered the metal oxide with band gap of greater than 5.0 eV works synergistically with the acid copolymer to improve odor suppression with less total metal oxide (and less CaO) compared to polymer matrix systems containing metal oxide only. The ability of acid copolymer to synergistically improve odor suppression when combined with metal oxide with band gap of greater than 5.0 eV (and CaO in particular) is unexpected.

[0089] The present disclosure provides a process. In an embodiment, the process includes providing a polymer component (A). The polymer component (A) includes (i) a PCR, (ii) optionally an olefin-based polymer, and (iii) has an amount of at least one volatile carbonyl-containing species. The process includes adding to the polymer component (A) from 0.15 wt % to 15 wt % of an odor suppressant (B). The odor suppressant (B) includes (Bi) from 0.05 wt % to 2 wt % of a metal oxide having a band gap greater than 5.0 electron volts (eV), and (Bii) from 0.1 wt % to 13 wt % of an acid copolymer, the ratio of metal oxide to acid copolymer is from 1:20 to 1:1 to form an odor-reduced composition. The process includes neutralizing, with the odor suppressant, at least some of volatile hetero-carbonyl species in the polymer component (A) to form an odor-reduced composition. Weight percents are based on total weight of the odor-reduced composition.

[0090] In an embodiment, the process includes forming an odor-reduced composition exhibiting at least a 20% reduction in the amount of a volatile hetero-carbonyl species compared to the polymer component (A) without the odor suppressant, as measured by normalized gas chromatography.

[0091] In an embodiment, the process includes dispersing, before the adding, particles of the metal oxide in the acid copolymer to form an odor suppressant pre-blend. The process includes adding the odor suppressant pre-blend to the polymer component (A) to form the odor-reduced composition.

[0092] By way of example, and not limitation, some embodiments of the present disclosure will now be described in detail in the following Examples.

EXAMPLES

[0093] Materials used in the examples are provided in Table 1 below.

TABLE-US-00002 TABLE 1 Material Material/Description Abbreviation Properties Source NT PCR HDPE PCR Post consumer resin HDPE Talco Plastics DMDA-1250 PE1 HDPE, ethylene/octene copolymer; The Dow (HDPE) density = 0.955 g/cc; MI 1.5 g/10 min, Chemical Tm = 130° C. Company Calcium Oxide (CaO) CaO density = 3.3 g/cc; Sigma- Loss on Ignition 1000° C. after Aldrich 2 hours ≤ 10% Chemical Company Nucrel ® 3990 AC ethylene/acrylic acid copolymer; 9.5 DuPont (acid copolymer) wt % acrylic acid copolymer; density = 0.940 g/cc; Tm = 78° C.; MI = 10 g/10 min

1. Sample Preparation

[0094] Melt processing: Modified version of ASTM D1238, using a Tinius Olsen MP600 extrusion plastometer set to 190° C. with a 10 Kg weight. Strands were collected and cut into ˜1 cm pieces and re-introduced into the plastometer and extruded a second time (to facilitate more mixing). The second resulting strand was cut into ˜1 cm pieces and immediately placed into glass vials sealed with PTFE caps.

2. Odor Suppression—Reduction in Volatile Hetero-Carbonyl Species

[0095] Samples were prepared by adding 2 grams of sample pellets to separate headspace vials. A 0.5 mL, 1700 ppmv sample of propanal was added separately to each headspace vial. Samples were sealed for 20 hrs at room temperature, and shaken for 4 hours. Headspace gas was withdrawn for testing as described above.

[0096] Comparative sample (CS1) was prepared. CS1 is a control sample with polymer component of 90 wt % DMDA1250 (HDPE) and 10 wt % PCR and no odor suppressant.

[0097] IE1 is an inventive example of the present composition composed of 88.9 wt % DMDA1250 (HDPE) and 10 wt % PCR and 1.1 wt % odor suppressant.

[0098] Table 2. Reduction in class of chemical concentration in headspace as measured by GC compositions (all results normalized to control sample, CS1).

TABLE-US-00003 TABLE 2 1E1* DMDA1250 + 10 wt % CS1* (control) PCR + 0.1 wt % CaO + 90% DMDA − 1 wt % NUCREL % Group Totals 1250 + 10% PCR 3990 reduction Aldehydes 2.4E+07 1.8E+07 27.80 Ketones 4.5E+06 3.9E+06 13.08 Alcohols 7.4E+07 5.3E+07 27.91 THF Derivatives 4.0E+06 3.0E+06 24.28 Tetrahydrofuran 9.2E+06 7.8E+06 15.57 All 1.1E+08 7.8E+07 27.12 *all weight percents based on total weight of composition

[0099] Normalized gas chromatography is determined using Equation (1) as follows:

(GC.sub.(aldehydes at 20 hrs,CS1)−GC.sub.(aldehydes at 20 hrs,IE1))/GC.sub.(aldehydes at 20 hrs,CS1)*100;

[0100] where GC.sub.(aldehydes at 20 hrs, CS1) is the area under the curve associated with aldehydes and t is a time point of 20 hrs exposure to gases the have volalized from an equivalent dose of post-consumer resin as used for CS1. Normalized gas chromatography Equation (1) is used for ketones, alcohols, THF, and THF derivatives in the same manner as for aldehydes set forth in this paragraph.

[0101] Odor suppression capability for CaO is known to be linear whereby the more CaO added to a polyolefin, the greater is the odor suppression. However, high loadings (greater than 5 wt %) of CaO are unfavorable because metal oxide, and CaO in particular can interfere with the melt processing of polyolefin.

[0102] In Table 2, IE1 (odor suppressant at 1.1 wt %, 0.1 wt % CaO and 1.0 wt % CaO:AC ratio 1:10) demonstrates that at small load (less than 0.2 wt % CaO and in IE1 specifically 0.1 wt % of CaO) odor suppressant in conjunction with 1:10 CaO:AC ratio exhibits a significant amount (greater than 20% reduction) of odor suppression after 20 hours.

[0103] It is specifically intended that the present disclosure not be limited to the embodiments and illustrations contained herein, but include modified forms of those embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the following claims.