PVC-Free Closures
AssigneeActega DS GmbH
InventorDany Mängel
Life of this patent
Estimating the term…
Abstract
The present invention relates to compositions (compounds) which can be used as seal material in vessel caps, even under pasteurization conditions and possibly sterilization conditions. More specifically, the invention relates to such compositions that are suitable for vessel caps that can be unscrewed, such as lug screw caps and in particular Press-on/Twist-off® caps, and that result in a reduced migration of undesirable substances.
Claims33
A vessel cap made of metal or plastic for a vessel for receiving foods or beverages, comprising a seal insert made of a seal material which comprises at least one polymer mixed with further substances, wherein
- the seal material contains no PVC and substantially ago crosslinked polymers;
- the seal material is substantially free from components that are liquid at application temperature;
- the seal insert can be pasteurized at temperatures up to 98° C.;
- the seal material has a Shore A hardness between 40 and 95;
- and
- the seal material comprises at least three different polymers, of which the first is a substantially thermoplastic polymer, whereas the two other polymers are different plastic thermoplastics or thermoplastic elastomers.
A vessel cap made of metal or plastic for a vessel for receiving foods or beverages, comprising a seal insert made of a seal material which comprises at least one polymer mixed with further substances, wherein
- the seal material contains no PVC and substantially no crosslinked polymers;
- the seal material is substantially free from components that are liquid at application temperature;
- the seal insert can be pasteurized at temperatures up to 98° C., and
- the seal material, as a primary component, comprises a poly(ethylene-co-propylene) with a density at 23° C. (ISO 1183) of 0.86-0.9 g/cm3 and a melt flow rate under conditions of 230° C./2.16 kg (MFR, ISO 1133) of 25-29 g/10 min at a Shore D hardness (15 sec, ISO 868) of 25-30, as a primary component.
A vessel cap made of metal or plastic for a vessel for receiving foods or beverages, comprising a seal insert made of a seal material which comprises at least one polymer mixed with further substances, wherein
- the seal material contains no PVC and substantially no crosslinked polymers;
- the seal insert can be pasteurized at temperatures up to 98° C., and
- the seal material, in relation to the total weight of the seal material, comprises a minimum content of 5% by weight of styrene-based block copolymer and a minimum content of 10% by weight of a propylene polymer and/or propylene copolymer, and optionally at least one oil component.
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8-10. (canceled)
13-16. (canceled)
18-20. (canceled)
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A vessel cap made of metal or plastic for a vessel for receiving foods or beverages, comprising a seal insert made of a seal material which comprises at least one polymer mixed with further substances, wherein
- the seal material comprises no PVC, and
- the seal insert can be pasteurized at temperatures up to 98° C. and can be sterilized at temperatures up to 132° C.,
- the seal material comprises a thermoplastic elastomer (TPE), and optionally a PP or (co)PP and/or an oil component,
- and the vessel cap is a lug screw cap, a hooded lid, a crimp-on cap, a metal cap that can be rolled on, or a Press-on Twist-off® cap.
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Dependencies are inferred from the claim text.