EP4055105A1

EP4055105A1 - Vessel closure seal and vessel closure

Info

Publication number: EP4055105A1
Application number: EP20713238.2A
Authority: EP
Inventors: Dany MÄNGEL
Original assignee: Actega DS GmbH
Current assignee: Actega DS GmbH
Priority date: 2019-12-10
Filing date: 2020-03-18
Publication date: 2022-09-14
Also published as: WO2021115639A1; AU2019477537B2; CN115087600A; JP2023505417A; AU2019477537A1; CA3157090A1; JP7441945B2; EP4054945A1; MX2022005623A; WO2021115571A1; AU2020399074A1; CA3160233A1; JP2023505751A; BR112022009450A2; CN114787277A; JP7395736B2; CN115087600B; MX2022005969A; KR20220109429A; ZA202204158B

Abstract

The application relates to a vessel closure seal, in particular for fat-containing filling materials, comprising a polymer compound of which the seal consists essentially or entirely, a) wherein the polymer compound is PVC-free and comprises at least one TPS, and at least two different co-PPs, or at least one co-PP with a Shore A hardness of max. 80, a crystallistion enthalpy of max. 30 J/g and a melting point of at least 155°C, b) and the polymer compound has a Shore A hardness at 70°C of between 30 and 85 and a Molt Flow Index (5kg/190°C) of less than 20g/10 min.

Description

VESSEL SEALING AND VESSEL SEALING

Patent description,

The invention relates to a PVC-free vessel closure seal, in particular for filling goods containing fat, comprising a polymer compound of which the seal essentially or entirely consists.

A major problem with polymer-based vessel closure seals is the migration of seal components into the product. Migration problems arise particularly frequently with filling goods containing fat or oil, since the migrating substances such as e.g. B. Plasticizers and extenders are often fat-soluble.

Larger vessel closures of the type considered here are, in particular, rotary cam closures that are typically used to close screw-cap jars for food or beverages. These foods are often fatty products such as convenience foods, sauces, delicacies, fish in oil, antipasti, spice pastes and the like, the fat or oil content of which increases the risk that fat-soluble components of the packaging material will dissolve in the food.

These requirements are also particularly relevant for baby food, which is typically sold in jars with Press-On Twist-Off® closures (also referred to here as PT closures or PT caps).

The vessel closures affected here usually have an opening width of at least 28 mm, in particular at least 35 mm, e.g. B. 38 mm or more, e.g. B. 82 mm and above. Rotary cam locks may have 4, 5 or more than 5 cams.

Conventional PVC-based vessel closures have favorable sealing properties. On the basis of soft PVC technology, it is also possible to formulate sealing compounds with low migration rates, which often use polyadipates. Due to their molecular weight, these tend to migrate less.

The prescribed test method EN 1186 for evaluating migration postulates that this is complete after 10 days of storage at 40 ° C. Analytical practice teaches that this is not the case in the case of plasticized PVC, so that even if the test conditions are complied with, closures already exceed the migration limits after a few months.

It is also undesirable to use PVC-containing compounds in packaging materials. The normal incineration of household waste produces acidic gases from halogen plastics, the escape of which into the atmosphere is harmful. In addition, even small amounts of PVC interfere with the material recycling of plastic waste. In addition, such PVC-based sealing elements require the use of plasticizers for reasons of unjustifiable changes to the food are also questionable. Furthermore, there has been a public discussion in recent years about additives used in PVC seals and their decomposition products. Examples are 2-ethylhexanoic acid, which often comes from stabilizers, and semicarbazide, which can be formed from exothermic blowing agents such as azodicarbonamide. These substances were also found in filling goods during official controls and their presence was objected to.

The migration of components of the packaging (which may also include the sealing insert of the container closure) into the food is not only generally undesirable, but is also strictly regulated by legal provisions. Examples of such provisions are the EC Regulations 1935/2004, 2023/2006, (EU) 10/2011, including the amendments (EU) 321/2011, (EU) 1282/2011, (EU) 1183/2012, (EU) 202/2014, (EU) 174/2015, (EU) 2016/1416, (EU) 2017/752, (EU) 2018/79, (EU) 2018/213, (EU) 2018/831, (EU) 2019 / 37 and (EU) 2019/1338. At present, maximum quantities of 60 ppm of migrating components are permitted for food for small children.

The extent of any migration observed is measured using methods such as those defined in DIN EN 1186 in particular. Such methods are also used in the context of the present invention.

There is therefore a need for PVC-free vessel closure seals which come as close as possible to the favorable properties of the known PVC-containing seals.

According to the invention, PVC-free compounds are used. In the product according to the invention, migration can largely or completely be avoided by dispensing with liquid constituents and / or by using polymers that are less susceptible to migration, as well as other measures.

It is not a trivial problem to provide vessel closures of the type considered here with PVC-free sealing inserts if these closures have to comply with the regulations mentioned with regard to the possible migration of their chemical components. The sealing function must also be guaranteed under filling conditions.

The requirements on the sealing materials for vessel closures for larger inner diameters (of at least 28 mm, often at least 35 mm) of the vessel opening are more demanding because of the relatively larger amounts of material in the seal. For such purposes, it is particularly important to combine sufficient flowability of the polymer material in the manufacture of the sealing element with sufficient sealing properties in the closed state; this also includes the impermeability required today to prevent the ingress or escape of gases, possibly combined with an overpressure valve effect that prevents the vessel from bursting when heated or when overpressure develops in the vessel for other reasons. In addition, however, especially for the typical uses of vessels with larger opening diameters (for example canned food), it is required that the sealing element also under pateurization conditions (at least 98 ° C) and possibly even sterilization conditions (above 100 ° C up to 132 ° C) can be used.

With all these characteristics, the seals must also meet the above requirements with regard to the possible migration of chemical constituents.

The vessel closures should be able to be attached to the container to be closed quickly and with minimal steaming. In addition to the usual mechanical closing process, the closures should also be suitable for manual closing.

A solution to these problems that has since been successfully introduced is disclosed in our application EP 09 756 681, now patent EP 2 470 435. The seal described there is PVC-free and is based on a combination of at least one olefin block copolymer (OBC) with at least one polyolefin elastomer (POE), high density polyethylene (HDPE) or polypropylene or propylene copolymer ((co -) PP). It should not contain a TPS. The Shore A hardness is between 45 and 95, the compression set between 30% and 90%.

Similar vessel closures are known from WO2012 / 152329, in which the seal comprises a polymer compound with 35% homo-PP, 44% OBC / TPS and 20% POE. In order to facilitate the processing of conventional compounds, extenders and / or plasticizers are usually added to them. In particular, components that are liquid at application temperature, such as extender oils and / or plasticizers (preferably white oil), are used for this purpose. However, the known formulations essentially or preferably completely dispense with lubricants and components that are liquid at 20 ° C., since they can promote migration.

The product known from EP 09 756 681 is outstandingly suitable for many applications, but there is still room for improvement for some uses. In mechanical closing processes, the seal can be cut through if the closing path is very short and the machine can only be adjusted to a limited extent. In the case of very fast running machines for pre-vaporized closures, the processing time is occasionally insufficient to warm up the closure sufficiently.

It would therefore be desirable to have a seal which is thermally stable and at the same time softer than the seals known from EP 09 756 681, and which leads to fewer cuts. This seal should have the advantageous properties of the known seal as far as possible.

Seals should also have opening values that are as low as possible so that rotary fasteners such as rotary cam fasteners, PT fasteners and other rotary fasteners can be easily opened. It must be ensured that the closure is not opened unintentionally, which is why the opening value cannot be too low. With conventional 82 mm Twist Off ^® closures, the opening values of seals containing PVC are often in the range of 4.8 - 6.2 Nm (42-55 inch / lbs) and above. Technically complex Orbit ^® closures, with PVC-based seals with low migration values, which were developed to reduce the torque required for opening, are less than 4 Nm. In the known seal according to EP 09 756 681, typical opening values for Twist ^Off® closures are 4.3-5.1 Nm. A lower opening value would be an advantage for PVC-free closures. It is an essential object of the invention to provide a seal with the above properties.

In principle, the invention solves these and other objects by means of the combinations of features specified in the independent patent claims.

As with the solution according to EP 09 756681, the disclosure of which we fully incorporate into the disclosure of this application by reference, the seal of the invention preferably comprises a polymer compound that is introduced into a sealing blank made of metal or plastic in a thermally sufficiently flowable form and through there Stamping or the like. Is brought into the desired shape, which it retains after cooling. In these cases, the finished seal usually consists entirely of the polymer compound. Machines for corresponding manufacturing processes are z. B. available from SACMI. The terms "seal", sealing insert "and" sealing element "are synonymous in the context of this description.

In the case of the vessel closures according to the invention, the sealing element is designed in a similar manner as an insert on the inner surface of the vessel closure, as is also the case with the known crown corks or screw caps.

In principle, the production method according to the invention is based on a metal vessel closure blank, which is preferably first pretreated on its inside with a suitable primer. This pretreatment is not necessary with a plastic vessel closure.

The paint system of this primer usually consists of a base coat and an adhesive coat, both of which can be based on an epoxy-phenolic resin system or (mostly for regulatory reasons) on polyesters. Lacquer systems from ACTEGA Rhenania (base lacquer TPE279 with adhesive lacquer TPE 1500 or ACTEcoat® TPE 515 with ACTEbond® TPE-655-MF), to which the most preferred compounds according to the invention adhere particularly well, are particularly suitable for this.

Alternatively, a suitable primer coating can be applied by lamination, lamination or possibly also by co-extrusion.

In preferred embodiments, the polymer material, which is to form the seal, is thermally applied to the pre-treated blank on the inside applied in a flowable form. In particular, an extrusion in which the sealing compound is placed in the temperature range between 100 ° C and 260 ° C is suitable for this. The extrusion can take place approximately in the middle of the inner surface of the blank if the sealing insert is to be designed in the shape of a circular disk. The metering of the polymer material for the extrusion takes place by stripping off a defined amount of the polymer compound at a nozzle. While the known bottle caps (crown caps and the like) usually design the sealing element as a circular disk on the inside of the vessel closure, in the case of larger vessel closures such as according to the invention it can be advantageous to instead form only a ring made of polymer material, which is attached to the vessel when the vessel is closed The vessel wall is in contact with the opening area.

For this purpose, the method described in US Pat. No. 5,763,004 can be used, which is incorporated into the present description by reference. Subsequently, the circular disk-shaped sealing element is preferably formed from the extruded, still flowable material by appropriate stamping (analogous to the known SACMI method).

In a modified form, the sealing element can be formed outside the closure or closure blank by stamping a suitable polymer material and then introduced into the closure or blank. This process is also known from SACMI as outshell molding.

As a major or sole component, the gasket material comprises a non-PVC polymeric component (i.e., a

Polymer compound) which, in one variant, comprises at least three different polymers, namely at least one TPS and a first co-PP and a second co-PP that differs from the first co-PP in at least one physical and / or chemical parameter. In a second variant, the component comprises at least one TPS and at least one co-PP, this co-PP having a Shore A hardness of at most 80, a crystallization enthalpy of at most 30 J / g and an MFI of less than 20 g / 10 min .

The properties of this main polymeric component can be modified in a suitable manner by adding further components, for example further polymers.

The invention thus detaches itself from the concept known from EP 09 756 681, according to which the desired seal or the polymer compound of the seal must contain an OBC. An OBC can, but does not have to be included in the seal according to the invention.

Furthermore, the invention breaks away from the concept according to EP 09 756 681, according to which the seal or the sealing compound must not contain a TPS. Instead, the invention is based on the knowledge that thermally and mechanically stable, but softer, generic seals can be obtained if the polymer compound comprises certain types of TPS, in particular SEBS, in combination with certain types of co-PP. Not all known types of TPS and not all known types of co-PP are suitable for this, as will be described below.

It is preferably provided that the material of the sealing insert has only very low and particularly preferably no contents of components that are liquid at the application temperature. The application temperature is usually the same as the ambient temperature, i.e. in the range of normal ambient temperatures outdoors or in heated rooms. Typically the application temperature is 20 ° C. Therefore, preferably only small amounts or preferably no amounts of liquid extenders such as, in particular, white oil are added to the material of the sealing insert.

The material preferably contains no more than 10%, preferably no more than 7%, in particular no more than 5%, of lubricants, in particular those which, in a migration test at 40 ° C for 10 days, are limited to the fatty substance (percentages are in this application always percentages by weight, based on the total weight of the compound in the seal, unless expressly stated otherwise).

It is currently most preferred that the material contain no components that are liquid at 20 ° C. and also no conventional plasticizers within the analytical limits of quantification given in the prior art at the time of filing.

Polymer compounds according to the invention generally have a Shore A hardness at 70 ° C. between 30 and 85, more specifically between 40 and 75. The lower the hardness, the easier it is to attach the closures. When used on steam vacuum sealing machines, there is an increased risk of cuts if the hardness is below Shore A 30. Above Shore A 85 there is an increased risk that the closure will not succeed. When used on cold vacuum sealing machines without preheating, no vacuum is achieved with Shore A above 85. The polymer compound preferably has a high viscosity, i. H. MFI (5kg / 190 ° C) according to DIN EN ISO 1133 of less than 20 g / 10 min., Better less than 15 g / 10 min., Even more preferably of less than 10 g / 10 min. And particularly preferably less than 6 g / 10 min.Especially for processing on cold vacuum sealing machines, it can be useful to set other viscosities.

The compression set (DVR) of the polymer compound according to DIN ISO 815-1, type B, method A, isotropic test specimens, is: • At 4 ° C between 5% and 45%, especially between 10% and 40%, preferably between 15% and 30%;

• at 23 ° C. between 15% and 55%, especially between 20% and 50%, preferably between 25% and 40%; · At 70 ° C between 35% and 85%, especially between 50% and 80%, preferably between 55% and 70%.

The anisothermal stress relaxation test (AISR method) is a valuable method for characterizing the mechanical properties of elastic polymer materials. According to VENNEMANN (e.g. in the article "PRACTICAL TESTING OF TPE"), this method can be used to determine thermal application limits for TPEs. As an essential parameter, the limit temperature is determined from the test, at which 90% of the temperature is initially due to an expansion of an S2 test body The voltage introduced at room temperature is reduced by 50% (T90). The higher the determined limit temperature T90, the greater the thermal stability of the tested material.

The "TSSR-Meter" from Brabender Messtechnik is suitable for carrying out the measuring process. This method serves as a replacement or supplement to the known (and standardized) determination of the compression set DVR and provides data that correlate with the elasticity of the polymer material.

The T90 value shows the temperature at which the tension decreases by 90%, i.e. at a certain temperature the sealant or compound has only 10% tension. Experience has shown that all compounds according to the invention are included

T90 values of at least 80 ° C. The T90 values can be used to determine whether the sealing process with the steam vacuum sealing machine with low Shore A less than 40 at 70 ° C or TSSR initial forces at 10N and T90 at 80 ° C does not result in any cuts.

The force required to generate 50% tension at 23 ° C can also be read off. Surprisingly, we have found that with forces less than 10 N there is often the risk of cuts (steam vacuum sealing machine), while with forces greater than 40 N, more sealing problems occur in both commercial steam and cold vacuum sealing machines. This manifests itself primarily as a loss of vacuum directly after the sealing process and thus leads to rejects during production. This problem affects all steam vacuum sealing machines and cold vacuum sealing machines common on the filing date, e.g. B. Arol Geyser, Tecnocap TSM 500, Unimac Gherri GG400, Pano DVV 100 E EL, Silgan White Cap 300 and Crown Global Capper.

The preferred range of this force for polymer compounds according to the invention is between 15 N and 25 N (strain 50% / 23 ° C.) for the steam vacuum sealing machine, and at 5 N and 15 N for the cold vacuum sealing machine. After closing, during and after the cooling process and often also during storage of the closed container, PVC-free compounds lead to crystallization processes in the polymer compound. These influence the hardness and elasticity of the seal and thus the tension between the closure and the container when it cools down after the closure process. The slower the crystallization, the smaller the tension that builds up, which negatively affects the opening torque.

The peak crystallization temperature and the total enthalpy of crystallization based on the weight is determined by DSC measurement (dynamic scanning calorimetry) from the first cooling curve. The rules for this are described in the ISO 11357 standard or its sub-chapters (in particular IS011357-3). The sizes were measured using a DSC1 system from Mettler Toledo.

Fig. 1 shows an example of such a DSC curve.

It has proven helpful for describing the suitability of a sealing material for vacuum rotary closures to design polymer compounds in such a way that the temperature of the exothermic peak is higher than the expected maximum operating temperature of the vessel closure. This exothermic peak temperature from the crystallization process is partly well below the temperature of the endothermic melting peak. In principle, the invention prefers the use of polymers which have low degrees of crystallinity, while particularly crystalline polymers such as homo-PP, LLDPE, LDPE and HDPE are preferably not used at all or only to a reduced extent. Preferred polymer compounds have a specific total enthalpy of crystallization above room temperature of less than 45 J / g, particularly preferably a maximum of 38 J / g, more preferably a maximum of 30 J / g.

The TPS used according to the invention are preferably SEBS and / or SEEPS. Alternatively or additionally, at least one polybutene can be used.

In general, linear SEBS and / or SEEPS with styrene contents between 26% and 34% are preferred. SEBS and / or SEEPS with styrene contents between 29% and 33% are particularly preferred, and SEBS and / or SEEPS with 31% to 32% styrene are most preferred.

Preferred polymer compounds generally comprise up to 50%, more particularly up to 45%, more preferably up to 40% TPS. Preferably such polymer compounds comprise at least 10%, especially at least 20% and more preferably at least 30% TPS.

TPS are not per se particularly suitable polymers for sealing compounds that come into contact with greasy or oily fillers, because they facilitate the entry of fats and oils into the seal. This particularly applies to products that are thermally treated, for example pasteurized or sterilized. According to EP 09 756 681 there is a need to dispense with TPS contents in the polymer compound as completely as possible.

However, it has surprisingly been found that TPS can also be used successfully in sealing compounds for applications in fats and oils if the polymer compound contains certain polypropylene copolymers (co-PP). Obviously, the co-PP content prevents the absorption of fats and oils by the seal even in the presence of TPS and also during pasteurization and even sterilization (up to temperatures of 132 ° C.) Homo-PPs are not used in preferred embodiments of the invention used by co-PPs.

In preferred embodiments of the invention, the TPS portion of the polymer compound consists of at least two different TPS, in particular two different SEBS.

The main component of this TPS component is preferably a linear SEBS which has a Shore A hardness of 50 to 90, preferably 55 to 80 and, as a 5% by weight solution in toluene, has a dynamic viscosity of> 50 mPa.s (measured at 25 ° C) and as a 10% by weight solution in toluene has a dynamic viscosity of> 1000 mPa.s.

Particularly preferred SEBS for this proportion are linear triblock copolymers of the S-E / B-S type.

Products such as KRATON ^® G1651 and CALPRENE ^® 6174 are particularly suitable.

A second SEBS with a styrene content of between 10% and 23%, a Shore A hardness between 30 and 60 and an MFI (2.16 kg / 230 ° C.) between 2 and 30 g / 10 min then preferably serves as a modifier.

KRATON ^® G1645 or G1643 can be used in a mixture with KRATON ^® G1651 to increase the flexibility of the compound (in the sense of a plasticizer, instead of white oil). The polymer compound also contains at least one co-PP.

The invention preferably uses contents of one or more co-PPs instead of contents of homo-PP in the polymer compound. In a first variant of the invention, the polymer compound contains two different co-PPs.

The first co-PP preferably has a Shore D hardness below 25, more preferably below 20.

It preferably has a DSC melting point above 145 ° C, more preferably above 155 ° C. The melting point of the first co-PP is preferably higher than that of the second co-PP. The first co-PP preferably has a total enthalpy of crystallization of less than 30, more preferably less than 25 and most preferably less than 20 J / g. The MFI (2.16 g / 10 min.) Of the first co-PP is preferably below 30, more preferably below 20 and most preferably below 10 g / 10 min.

The second co-PP preferably has a Shore D hardness above 25, more preferably above 30, but below 45.

It preferably has a DSC melting point above 140 ° C, more preferably above 145 ° C.

The second co-PP preferably has a total enthalpy of crystallization of less than 40, more preferably less than 35 J / g.

The MFI (2.16 g / 10 min.) Of the second co-PP is preferably below 35, more preferably below 25 and most preferably below 10 g / 10 min. The total amount of co-PP used in the compound is preferably generally 20% -65. The content of the first co-PP is preferably greater than the content of the second co-PP.

Particularly suitable products are the ADFLEX types C290F and Q190F from LyondellBasell, DuClear QT80A from Ducor and TAFMER PN 3560 from Mitsui Chemicals.

In preferred embodiments of the invention, the co-PP can be partially replaced by other polymers, for example by LLDPE.

In a second variant of the invention, the polymer compound contains at least one co-PP with a Shore A hardness of max. 80, a crystallization enthalpy of max. 30 J / g and a melting point of at least 155 ° C. In this second variant, too, the polymer material can contain a further polymer, e.g. B. another co-PP or polyolefin.

In certain embodiments, the invention uses contents of at least one POE as a further component of the polymer compound.

Preferred POEs contain PP units and randomly copolymerized ethylene units.

The POE content is preferably between 10% and 50%, more preferably between 20% and 40%. VISTAMAXX grades from ExxonMobil are particularly suitable, e.g. B. VISTAMAXX 6202.

The polymer materials can withstand a hot filling of up to 100 ° C for up to 60 minutes, starting from a hot filling of at least 60 ° C in a maximum of 10 minutes and at least 1 minute.The hot filling, starting from 60 ° C, can be used in steps of 5 ° up to 100 ° C in 60 minutes. Optionally, pigments, preferably inorganic pigments, can also be added to the formulations of the compounds in order to exclude pigment migration. It has also been shown that other additives such as waxes, silicones and, in particular, blowing agents can be added to the polymer compounds in order, for example, to improve processing and use properties.

In the following, exemplary embodiments of the invention are described on the basis of the composition of the polymer compounds from which the vessel closure seal according to the invention was formed as indicated above:

Example 1:

15% first co-PP 14% second co-PP 33.4% SEBS

35% POE

2.6% lubricants and additives

Embodiment 2: 20% first co-PP

14% second co-PP 33.4% SEBS 30% POE

2.6% lubricants and additives

Claims

1. Vessel closure seal, in particular for fatty goods, comprising a polymer compound of which the seal consists essentially or entirely, a) wherein the polymer compound is PVC-free and comprises at least one TPS, and at least two different co-PPs, or at least one co -PP with a Shore A hardness of max. 80, a crystallization enthalpy of max. 30 J / g and a melting point of at least 155 ° C, b) and the polymer compound a Shore A hardness at 70 ° C between 30 and 85 and has a melt flow index (5kg / 190 ° C) of less than 20g / 10 min.

2. Vessel closure seal according to claim 1, in which the at least one co-PP has a Shore A hardness of max. 75 and / or a crystallization enthalpy of max. 20 J / g and / or a melting point of at least 160 ° C.

3. Vessel closure seal according to claim 1 or 2, in which the polymer compound comprises essentially no homo-PP.

4. Vessel closure seal according to one of claims 1 to 3, in which the polymer compound comprises at least one SEBS, SEEPS or polybutene.

5. Vessel closure seal according to one of claims 1 to 4, in which the polymer compound comprises a linear SEBS or SEEPS with a styrene content between 26% and 34%, especially between 29% and 33%, and most preferably with 31% to 32% styrene.

6. Vessel closure seal according to one of claims 1 to 5, in which the polymer compound comprises at least 20%, more preferably at least 30% TPS.

7. Vessel closure seal according to one of the preceding claims, in which the polymer compound contains a linear SEBS which has a Shore A hardness of 50 to 90, preferably 55 to 80 and, as a 5% by weight solution in toluene, has a dynamic viscosity of> 50 mPa.s (measured at 25 ° C) and as a 10% by weight solution in toluene has a dynamic viscosity of> 1000 mPa.s.

8. Vessel closure seal according to one of the preceding claims, in which the polymer compound is a second SEBS with a styrene content of between 10% and 23%, a Shore A hardness between 30 and 60 and an MFI (2.16 kg / 230 ° C) between 2 and 30 g / 10 min.

9. Vessel closure seal according to one of the preceding claims, in which the polymer compound comprises a first co-PP with a Shore D hardness below 25, more preferably below 20 and a second co-PP with a Shore D hardness above 25, more preferably above 30 , but includes below 45.

10. Vessel closure seal according to one of the preceding claims, in which the polymer compound is a first co-PP with an MFI (2.16 g / 10 min.) Of the first co-PP of below 30, more preferably below 20 and most preferably below 10 g / 10min and a second co-PP with an MFI (2.16 g / 10 min.) below 35, more preferably below 25 and most preferably below 10 g / 10 min.

11. Vessel closure seal according to one of the preceding claims, in which the polymer compound has at least one co-PP with MFI (2.16kg / 230 ° C) of at least 0.1, more specifically at least 0.3 and even more specifically at least 0.5 g / 10min. includes.

12. Vessel closure seal according to one of the preceding claims, in which the DSC melting point of the first co-PP is higher than that of the second co-PP.

13. Vessel closure seal according to one of the preceding claims, in which the polymer compound comprises a first co-PP with a DSC melting point above 145 ° C, more preferably above 155 ° C.

14. Vessel closure seal according to one of the preceding claims, in which the polymer compound comprises between 20% and 70% co-PP.

15. Vessel closure seal according to one of the preceding claims, in which the polymer compound comprises at least one POE, preferably a PP-based copolymer.

16. The vessel closure seal according to claim 15, in which the POE content is between 10% and 50%, more preferably between 20% and 40%.

17. Vessel closure seal according to one of the preceding claims, in which the polymer compound contains no more than 10%, preferably no more than 7%, in particular no more than 4% and particularly preferably no more than 2.5% of lubricants.

18. Vessel closure seal according to one of the preceding claims, in which the polymer compound contains no more than 10%, preferably no more than 7%, in particular no more than 4% and particularly preferably no more than 1% of components that are liquid at 20 ° C.

19. Vessel closure seal according to one of the preceding claims, which can be pasteurized at temperatures above 98 ° C, preferably also at temperatures between above 100 ° C and a maximum of 132 ° C.

20. Vessel closure, in particular vacuum vessel closure, made of metal or plastic, with a vascular closure seal according to one of claims 1 to 18.

21. Vessel closure according to claim 20, with a diameter of at least 28 mm, preferably at least 35 mm.