JP2003535155A - Lubricant combination of erucamide and saturated co-lubricant in the composition used to manufacture the sealing device - Google Patents

Abstract

(57) A composition for producing a sealing device comprising a polyolefin resin and at least two lubricants. A linerless sealing device comprising a tocopherol antioxidant and a composition for manufacturing a sealing device made from the foregoing composition are disclosed. Preferably, the lubricant is erucamide and at least one saturated co-lubricant.

Description

Detailed Description of the Invention

The present invention is generally made from a composition for making a closure including a polyolefin resin and at least two lubricants, a linerless closure including a tocophenol antioxidant and the composition described above. A composition for producing a closed device,
Directed to. Preferably, the lubricant is erucamide and at least one saturated co-lubricant.

[0002] Closure devices for containers are such that they both can properly seal the container after it has been packed and are then easily opened by the end user to empty the contents of the container. ,It is valid. The composition of the closure device will define each of these properties. Determining whether a particular composition will be useful involves assessing both the applied torque and the removal torque of the closure. Applied torque is a measure of the force required to seal the container when the closure is initially applied, and removal torque is a measure of the force required to remove the closure. The contents of the container and the material of the container are also relevant to the selection of a suitable closure device.

Closing devices, which are usually more firmly applied, are also more difficult to remove. Lubricants are often added to the composition of the closure to improve the ease of removal of the closure. However, these lubricants have the potential of interacting with and leaching the contents of the container.

Fatty acid amides such as erucamide are typically used as lubricants in enclosed devices. However, these oleamides have double bonds susceptible to attack by oxygen. The result of this attack is that compounds such as aldehydes and ketones may also be produced from the lubricant. These aldehydes may give offensive or odorous contents to the container and are more or less pronounced depending on the contents. In particular, mineral waters have an elegant aroma such that they cannot tolerate even relatively slight off-flavours.

Further, bottled drinking water may be disinfected with ozone in order to remove microorganisms. Ozone is typically present in bottled water in trace amounts of 0.1 to about 0.4 mg / l. Ozone may also react with compounds containing double bonds (such as erucamide) to give aldehydes. These aldehydes are
It is believed to be responsible for the flavor or musty off-flavor of fruit in bottled water, depending on the concentration of contaminants.

The use of erucamide in closed devices can present problems, as drinking water specifications specify that drinking water should not have an odor or taste.

[0007] Antioxidants are often added to attempts to prevent undesired interactions of lubricants or other additives in closed device compositions. However, these too must be carefully selected to avoid unwanted interactions.

Accordingly, it is an object of the present invention to provide a composition for a closed device that includes a lubricant that reduces off-flavor and / or odor problems.

A further object of the present invention is to provide an antioxidant that protects against the oxidation of polypropylene or lubricants, thereby reducing off-flavor and / or odor problems.

The present invention is directed to a) about 98.5 to about 99.9 weight percent of at least one polyolefin resin, and b) about 1.5 to about 0.01 weight percent of erucamide and at least one. A combination of saturated co-lubricants, which is directed to a composition of a closed device, wherein the ratio of erucamide to co-lubricant is 1:10 to 10: 1.

The composition may further comprise from about 0.1 to about 3 weight percent of at least one antioxidant. The antioxidant may be tocopherol or its homologue. The composition may also include an additional antioxidant, wherein the ratio of said antioxidant to said additional antioxidant is from about 1: 5 to about 5: 1.

The present invention also provides a) about 97 to about 99.9 weight percent of at least one polyolefin resin, and b) about 3 to about 0.1 weight percent of the antioxidant tocopherol or homologues thereof. , And is directed to a closure composition for a linerless closure including a.

The composition may further comprise a lubricant or an additional antioxidant, wherein the tocopherol to the additional antioxidant ratio is from about 1.5 to about 5: 1. More specifically, the lubricant may be from about 1.5 to about 0.01 weight percent of the total composition and the lubricant may be a combination of erucamide and at least one saturated co-lubricant. The ratio of erucamide to co-lubricant is
It may be 1:10 to 10: 1.

[0014]   Further, the present invention is   Round top wall, with a hanging ring-shaped skirt, It is also suitable for closed devices including   The skirt has internal threads and hanging tear bands, Here, the sealing device is molded from the composition described above.

For any aspect of this invention, the polyolefin may be polypropylene. Additives such as dyes and emulsifiers may also be included. Alternatively, the closure may be a linerless closure. More specifically, an additional dye that may be utilized is ultramarine. The saturated co-lubricant may be stearamide, behenamide, ethylene bis-stearamide, or zinc stearate.

The present invention is also directed to a method for reducing odors and off-flavors of contents accumulated in a sealed container, comprising the step of sealing said container with a linerless closure, wherein: The linerless closure is of the composition described above. The contents of the container may be water or other portable beverages, and odors and off-flavours may be formed from aldehydes or ketones, which may be formed by undesired reaction with certain additives to the composition of the closure. It may be induced.

The present invention is generally made from a composition for making a closure including a polyolefin resin and at least two lubricants, a linerless closure including a tocopherol antioxidant, and the composition described above. The present invention is directed to a composition for producing a closed device. Preferably, the lubricant is erucamide and at least one saturated co-lubricant.

{Definition of Terms} As used herein, the term “composition” refers to a product containing the specified ingredients in the specified amounts, as well as directly from a combination of the specified ingredients in the specified amounts. Or, any product that occurs indirectly is intended to be included.

Lubricants Lubricants have been utilized externally to treat the sliding surface of the cap to reduce opening torque as disclosed in US Pat. No. 4,710,409. . Alternatively, the lubricant may be a component of a closure device composition such as that taught by US Pat. No. 4,209,102. Those of ordinary skill in the art will appreciate that erucamide is a useful lubricant for incorporation into closed device compositions. However, the potential for undesired erucamide interactions to produce off-flavors or odors, as mentioned above, exists. The inventors have found that when reducing the amount of erucamide and utilizing a suitable co-lubricant, the resulting lubricant combination is capable of maintaining the desired torque and undesired interaction of the closure and related products. It has been found that it is possible to minimize sex.

Lubricant combinations for use in liners of closures are described in US Pat.
, 306,542 and 5,925,430. However, the liner of the sealing device is mainly made of a resin different from that of the sealing device without the liner. Furthermore, there is no recognition in these patents that saturated co-lubricants appear to be particularly useful in the prevention of odors and off-flavours.

At least one lubricant is utilized in combination with erucamide in the composition of the closure device. In the present composition, the co-lubricant is a compound that is saturated, meaning that it has no double bonds. The use of co-lubricants reduces the amount of erucamide that must be utilized. Moreover, if the co-lubricants are unsaturated, there is less likelihood of unwanted interactions. As a result, the potential for off-flavor or odor production from the lubricant combination will be minimized. The ratio of erucamide to co-lubricant is 1:10 to 10: 1.
, Preferably 1: 5 to 5: 1, most preferably 1: 2 to 2: 1.

Co-lubricants used with erucamide include, among others, liquid hydrocarbons, industrial grade white mineral oils, synthetic paraffins, petroleum waxes, petroleum waxes, and aliphatic hydrocarbons such as petroleum jelly and odorless light hydrocarbons. Lubricants, silicone resins such as organopolysiloxanes, relatively higher saturated fatty acids obtained from vegetable and animal oils having 8 to 22 carbon atoms and their fats and hydrogenated products, hydroxystearic acid, animals And a straight-chain aliphatic monohydric alcohol having at least 4 carbon atoms obtained by reducing vegetable oils and saturated fats or by degradative distillation of natural waxes,
Dodecyl alcohol, polyethylene glycol having a molecular weight of 200 to 9500, polypropylene glycol having a molecular weight of at least 1000, and 1.
Polyglycols such as polyoxypropylene-polyoxyethylene block copolymers having a molecular weight of 900 to 9000, alkali metals of relatively higher saturated fatty acids, alkaline earth metals, zinc or aluminum salts, various metal soaps, Such as low molecular weight polyethylene, low molecular weight olefin resins such as low molecular weight polypropylene and oxidized polyethylene, polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymers, polychlorotrifluoroethylene and polyvinyl fluoride. Fluorine resin, propylene glycol = alginate, dialkyl ketone, and acrylic copolymer may be used.

Co-lubricants include higher fatty acid amides, 2-steroamidoethyl = stearate, ethylene-bis-saturated fatty acid amides, N, N′-bis having 12 to 18 carbon atoms in the alkyl group. -(2-hydroxyethyl) -alkylamide,
It may also be an amide or amine such as N, N′-bis (hydroxyethyl) -lauroamide, fatty acid diethanolamine, and distearic acid ester of di (hydroxyethyl) -diethylenetriamine = monoacetate.

Co-lubricants also include, among others, n-butyl acetate acetate, hydrogenated methyl ester of rosin, di-n-butyl sebacate, 2-ethylhexyl sebacate, octyl sebacate, Glycerin fatty acid ester, pentaerythritol stearic acid ester, pentaerythritol tetrastearate, sorbitan fatty acid ester, polyethylene glycol fatty acid ester, polyethylene glycol = monostearate, polyethylene glycol = dilaurate, polyethylene glycol = monooleate, polyethylene glycol =
Fatty acid esters of monohydric or polyhydric alcohols such as dioleate, coconut fatty acid esters of polyethylene glycol, tall oil fatty acid esters of polyethylene glycol, 1,3-butanediol = diethylene glycol = stearate, and fatty acid esters of propylene glycol, Good.

Co-lubricants also include triglycerides and waxes such as hydrogenated edible oils and fats, cottonseed oil and other edible oils, linseed oil, palm oil, glycerin esters of 12-hydroxystearic acid, among others. With hydrogenated fish oil, beef tallow, whale wax, montan wax, carnauba wax, beeswax, wax wax, hydrogenated whale oil and monohydric fatty alcohols such as lauryl stearate and stearyl stearate, with saturated fatty acids And the lanolin. Those skilled in the art will appreciate that some of the natural products described in this paragraph may be partially unsaturated. Such products may be hydrogenated prior to use as a saturated co-lubricant in the compositions described herein.

Currently, the preferred co-lubricants are behenamide (Croda Oleo, UK).
CRODAMIDE BR), ethylene bis-stearamide, stearamide and zinc stearate available from Chemicals.

The combination of lubricants is based on the raw resin as the main material, and is 0 in the composition of the closed device.
． It is incorporated in an amount of 01 to 1.5% by weight, preferably 0.2 to 1% by weight, and particularly preferably 0.2 to 0.5% by weight. If the amount of lubricant is too low and below this range, the opening torque will be too high and the operation of the opening will be difficult.
When the amount of lubricant is too high and exceeds the above range, the applied torque is too low, causing poor sealing.

{Antioxidant} Useful antioxidants are, among others, ascorbic acid, isoascorbic acid, gallic acid, tocopherol, hydroquinone, catechol, resorcin, dibutylhydroxytoluene, dibutylhydroxyanisole, pyrogallol, tetrakismethylene. (Hydroxyphenyl propionates such as 3,5-di-t-butyl-4′-hydroxyphenyl propionate, alkylphenols such as 2,6-di-tert-butyl-4-methylphenol, tris (3 , 5-
Hydroxybenzyl compounds such as di-tert-butyl-4-hydroxybenzyl) isocyanurate, 2,2′-methylene-bis (4-methyl-6-t-)
Alkylidene bisphenols such as butylphenol, bis (2,4-di-
tert-butylphenyl) pentaerythritol diphosphite and phosphites and phosphonate ions, sorbose, glucose, lignin, iron powder and iron-based antioxidants such as active iron, ferrous oxide and iron salts. Inorganic antioxidants such as sulfites, thiosulfites, dithionite ions and bisulfites, redox resins and polymers such as polymer-metal complexes, zeolites, activated carbon or salts thereof. The combination of antioxidants described above is also believed to have utility in the compositions of the present closures.

Tocopherol is preferably an antioxidant. However, a wide variety of tocopherol compounds may be used. The compound dl-alpha-tocopherol (2,5,7,8-tetramethyl-2-, also known as vitamin E
(4 ', 8', 12'-Trimethyltridecyl) -6-chromanol) is quite useful. However, homologues such as stereospecific isomers of alpha or beta tocopherol, gamma tocopherol, and 6-tocopherol may also be used in accordance with the present invention. Vitamin E is a useful antioxidant in HDPE polymers as described by Ho et al. In Journal of Vinyl.
& Additive Technology, June 1998, Vol.
4, No. 2, pp 139-150. Tocopherols have also been disclosed in U.S. Pat. Nos. 5,863,964 and 5,663,223 as flavoring agents that protect together with another compound with respect to the liner of a closure. In addition, tocopherols have also been disclosed in US Pat. No. 5,143,763 as a useful oxygen scavenger in covers for containers. However, tocopherols have not been disclosed for use as antioxidants in compositions for producing linerless closed devices. The liner of a closure system usually contains ethylene vinyl acetate, through which the tocopherol disperses easily. However, it would not be taken for granted that polyolefin resins, such as polypropylene, utilized in compositions for making linerless closures allow for easy tocopherol dispersion.

[0030]   In addition, useful antioxidants may include catalysts, moisture retention agents or hydrates.

Preferably, the antioxidant is in an amount of about 0.1 to about 3% by weight, more preferably about 0.2% to about 2% by weight, and most preferably about 0. It is present in the closed device composition in an amount of from 0.5 to about 1.5% by weight.

When using two antioxidants together in a closed device composition, the ratio of the first antioxidant to the second antioxidant is from about 1: 5 to about 5: 1, preferably , About 1: 3 to about 3: 1, most preferably about 1: 2 to about 2: 1,
Is.

{Resin} Polyolefins such as polyethylene, polypropylene, or copolymers formed from at least a second monomer and propylene or ethylene may be utilized in the composition of the enclosed device. Polypropylene is a particularly suitable resin. Also, any combination of the above polyolefins may be utilized.

{Other Ingredients} Dyes may be added to the composition of the enclosed device. A white pigment such as titanium dioxide may be added to dye the closure or make it opaque. Coloring dyes such as carbon black, red iron oxide, tartrazine lake, or ultramarine (ULTRAMARINE BLUE NUBX E-25 available from Clariant) may be added. Microencapsulated dyes may be particularly advantageous in some cases. The dye is typically about 0.2% to about 0.8% of the total composition.

The emulsifier may be added to the co-lubricant or separately to the composition of the closed device. Suitable emulsifying agents include non-toxic, non-ionic surfactants that are substantially tasteless at the concentrations used, or at least free of any unpleasant or undesirable taste. An example is a fatty acid ester of sorbitan polyoxyethylene such as sorbitan polyethylene (20) monooleate (TWEEN 80).

The ratio of the smoothing composition to the emulsifier and the concentration of emulsifier in the smoothing formulation may vary within wide limits depending on the environment.

{Sealing Device} The compositions described above may be utilized to form a sealing device. Suitable closures here are described below.

While the present invention may be embodied in various forms, the disclosure is considered to be illustrative of the invention and it is intended that the invention be limited to the particular embodiment described. With the understanding that it is not, examples are shown in the drawings and described below.

Referring to FIGS. 1 and 2, there is shown a container closure 10 for use with an associated container C. The closure includes a circular top wall portion 12 and a hanging annular skirt portion 14. The closure is threaded in cooperation with the thread formation in the associated container C, the internal thread formation 1 in the skirt portion 14 being threaded.
Including 6.

A closure device 1 to facilitate venting of gas pressure from within the associated container.
The zero skirt portion 14 defines a plurality of axially extending vent grooves 18.

In the illustrated embodiment, the closure device 10 includes a ring-shaped tear band 20 that is configured for a tear indication and is therefore hung from the skirt portion 14 and at least partially fragilely connected to the skirt portion 14. The tear band includes an annular band portion 22 that is separated from the skirt portion 14 by a score 24 that extends around it, separating the tear band from the skirt portion. A plurality of circumferentially-spaced brittle bridges 26 extend between the skirt portion and the inner surface of the tear band to provide the desired brittle connection therebetween.

In the illustrated embodiment, the tear band 20 of the closure 10 is formed in accordance with the teachings of US Pat. No. 4,938,370 to McBride, which is hereby incorporated by reference. Thus, the described tear band includes a plurality of circumferentially spaced inwardly extending flexible projections 28 formed for cooperative engagement with the annular cinching ring of the associated container C. Otherwise, the tear band of closure device 10 is described in US Pat. No. 4,418 to Wiled et al., Which is hereby incorporated by reference.
, 828.

The described closure device 10 is of a linerless configuration, that is, the closure device is located near or adjacent to the top wall portion 12 for sealing the engagement with the associated container. Sealed liner components or similar elements. Rather, the closure device generally includes an integral cohesive annular sealing lip 30 that projects inwardly from the junction of the uppermost wall portion 12 and skirt portion 14. The annular sealing lip 30 is formed for resilient and flexible engagement with the associated container C as shown in FIG. The desired cooperative sealing between the sealing lip and the container is improved by the provision of an annular stop element 32 depending from the top wall portion 12 of the closure device 10. As illustrated in FIG. 2, when the closure device 10 is thus applied to the associated container with the stop element cooperating with the sealing lip, in cooperation with the container C to effect the sealing with the sealing lip, a flexible sealing is obtained. The lip 30 and the stop element 32
Move upwards against.

The following examples are provided to describe preferred embodiments and the utility of the invention and are not meant to limit the invention unless otherwise stated in the claims appended hereto.

Example 1 To illustrate the utility of the compositions of the present invention, a combination of erucamide and a saturated co-lubricant was incorporated into a composition typically utilized in linerless closures,
It was then injection molded into a closed device. These closures were subjected to conditions that might enhance any potentially unwanted interaction, and were then scrutinized for odors to determine if all odors could be detected. The experiment was conducted as follows.

A sample of polypropylene resin was prepared using a 2 "single screw extruder and fluff containing lubricants was compounded as specified in Table 1 below. Was from Witco such as KEMAMAIDE E with -cis-docosanamide Co-lubricant was behenamide (CR
Croda Oleochemical in England as ODAMIDE BR
available from s, principal component: docosanamide), ethylene bis-stearamide, stearamide (octadecane amide, Witc as KEMAMEDES S)
O.), and zinc stearate (available from Akzo Nobel). Each formulation was then rotary compression molded to form a closed device for evaluation.

To determine the oxidative stability of the synthesized closures, a portion of each closure was placed in a jar containing hydrogen peroxide. The jar was sealed and the pressure inside the jar was reduced. The jar was then placed in an oven and the temperature maintained at 120 ° F for 3 days.

After this time, a 10 ml sample of headspace was analyzed via GC / MS to identify any volatile compounds present. The solution was also analyzed by GC / MS. Analytical tests showed that amines could be detected when testing compositions containing erucamide as the only lubricant, but no amine was present in the materials of the enclosed device containing the lubricant combination.

Formulations further informally tested by a panel to determine if there is an unpleasant odor. Formulations 1 to 3 represent the combinations described herein, Formulation 2
And 3 clearly show that no contaminants were detected by either the analysis or the informal panel, and that none of the three formulations contained an amine by GC analysis. Since the odor test is informal, the reliability in the results of the GC analysis was given the greatest weight in the acceptance decision.

[0050]

[Table 1] Example 2 Utilizing the procedure for making test samples described in Example 1, other formulations were tested by panel using conventional triangulation or multiple comparison tests. The composition of the formulation is listed in Table 2. Formulations 4 and 5 represent only the conventional lubricant, erucamide. Formulations 6 and 7 represent the combinations disclosed herein. After placing the sample in the jar,
The test samples were evaluated after one week, two weeks, two months, and four months. In each case, the panels determined that formulations 6 and 7 were within the requirements met by the currently acceptable closures. Presently acceptable closures are made of polyethylene, a resin that requires much less lubrication than polypropylene.

[0051]

[Table 2] All references cited are hereby incorporated by reference.

The invention is illustrated by the above description and examples. The foregoing description is intended as non-limiting, as many variations will be apparent to those of ordinary skill in the art in their consideration.

All such variations within the scope and spirit of the appended claims are intended to be embraced thereby.

Changes may be made in composition, operation, and arrangement of the inventive methods described herein without departing from the inventive concept and scope as set forth in the claims below.

[Brief description of drawings]

[Figure 1]   1 is a cross-sectional view of a plastic closure device embodying the principles of the present invention.

2 is an enlarged fragmentary view of the closure device shown in FIG. 1 illustrated with an associated container.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08K 5/20 C08K 5/20 C08L 23/12 C08L 23/12 (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW), EA (AM , AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, C A, CH, CN, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP , KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, R O, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW (72) Inventor Leland, Mark Ei United States Indiana 46112 Brownsburg Auburn Drive 1466 (72) Inventor Dawn, Steven Canchen United States Indiana 46157 Pittsboro East Sear 900 / North 6467 F Term (Reference) 3E08 4 BA01 CA01 CC03 CC05 CC08 DA01 DB03 DB12 DC03 DC05 DC08 FA09 FB02 GA01 GB01 GB08 HB02 HD02 KA13 KA15 4F071 AA15 AA15X AA20 AA51 AA71 AC07 AC09 AC10 AC11 AC12 AC15 AC2 AC02 AC15 AC2 AC02 AC01 AC2 AC02 AC02 AC02 AC02 AC02 AC02 AC02 AC02 AC02 AC02 AC02 AC02 DA038 DE118 ED057 EG046 EH036 EH046 EH056 EJ017 EJ037 EJ067 EL067 EL097 EN106 EP016 EU197 EW067 EW127 FD077 FD098 FD172 FD176 FD313 GG01

Claims (19)

[Claims] 1. A) about 98.5 to about 99.9 weight percent of at least one polyolefin resin, and b) about 1.5 to about 0.01 weight percent of erucamide and at least one saturated co-lubricant. The composition of an enclosed device, wherein the ratio of erucamide to co-lubricant is 1:10 to 10: 1. 2. The composition according to claim 1, wherein the polyolefin is polypropylene. 3. The composition of claim 1 for linerless closures. 4. The composition of claim 1 further comprising from about 0.1 to about 3 weight percent of at least one antioxidant. 5. The composition according to claim 4, wherein the antioxidant is tocopherol or a homologue of the tocopherol. 6. Further comprising an additional antioxidant, the ratio of said antioxidant to said additional antioxidant being from about 1: 5 to about 5: 1.
The composition according to claim 4, which is 7. The composition of claim 1, further comprising an additive selected from the group consisting of dyes and emulsifiers. 8. The composition of claim 7, wherein the additive is ultramarine. 9. The composition of claim 1, wherein the saturated co-lubricant is selected from the group consisting of stearamide, behenamide, ethylene bis-stearamide and zinc stearate. 10. A compound comprising: a) about 97 to about 99.9 weight percent of at least one polyolefin resin; and b) about 3 to about 0.1 weight percent of the antioxidant tocopherol or a homologue of the tocopherol. Closure composition for linerless closures. 11. The composition of claim 10, further comprising an additive selected from the group consisting of dyes and emulsifiers. 12. The composition of claim 11, wherein the additive is ultramarine. 13. The polyolefin as claimed in claim 10, which is polypropylene.
The composition as described. 14. The composition of claim 10, further comprising a lubricant. 15. Further comprising an additional antioxidant, wherein the ratio of said tocopherol to said additional antioxidant is from about 1: 5 to about 5.
The composition according to claim 10, wherein the composition is 1. 16. The composition of claim 10, further comprising about 1.5 to about 0.01 weight percent of a combination of erucamide and at least one saturated co-lubricant. 17. The composition of claim 15, wherein the co-lubricant is selected from the group consisting of stearamide, behenamide, ethylene bis-stearamide and zinc stearate. 18. A closure device, comprising:   Includes a circular top wall with a hanging annular skirt,   The skirt has internal threads and hanging tear bands,   A closure device, wherein the closure device is molded from the composition of claim 1. 19. A method for reducing odors and off-flavors of contents accumulated in a sealed container, comprising the step of sealing the container with a linerless closure, the linerless closure including: A method which is a linerless closure of the composition of claim 1.