ROTARY VACUUM VESSEL CLOSURE WITH VESSEL CLOSURE SEAL

Abstract

The invention relates to a rotary vacuum vessel closure, in particular for fat-containing filling materials, with a vessel closure seal comprising a polymer compound of which the seal consists substantially or entirely: a) wherein the polymer compound is PVC-free and comprises at least one TPS and at least one co-PP, b) and the polymer compound has a Shore A hardness (ASTM D2240, DIN ISO 7619-1) at 70° C. between 30 and 85 and has an MFR (DIN ISO 1133, 5 kg/190° C.) of less than 20 g/10 min.

Claims

1. Rotary vacuum vessel closure suitable for fat-containing filling materials, comprising a vessel closure seal 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 one co-PP, b) and the polymer compound has a Shore A hardness (ASTM D2240, DIN ISO 7619-1) between 30 and 85 at 70° C. and an MFR (DIN ISO 1133, 5 kg/190° C.) of less than 2.0 g/10 min, and (c) does not contain more than 10% of liquid constituents at 20° C.

2. Rotary vacuum vessel closure according to claim 1, in which the polymer compound substantially does not comprise a POE.

3. Rotary vacuum vessel closure according to claim 1, in which the polymer compound substantially does not comprise a homo-PP.

4. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises at least one SEBS, SEEPS or polybutene.

5. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a linear SEBS with styrene content levels between 20% and 40%.

6. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises at least 1%.

7. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a TPS with a Shore A hardness (ASTM D2240, DIN ISO 7619-1) from 50 to 90 at 23° C.

8. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a co-PP having a Shore D hardness (ASTM D2240, DIN ISO 7619-1) of less than 55 at 23° C.

9. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a co-PP having an MFR of less than 30 g/10 min measured at 2.16 kg/230° C.

10. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a co-PP with an MFR (2.16 kg/230° C.) of at least 0.1.

11. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises a co-PP with a melting point below 165° C.

12. Rotary vacuum vessel closure according to claim 1, in which the polymer compound comprises between 1% and 80%.

13. Rotary vacuum vessel closure according to claim 1, in which the polymer compound further comprises LLDPE.

14. Rotary vacuum vessel closure according to claim 1, in which the polymer compound does not contain more than 10%, of lubricants.

15. Rotary vacuum vessel closure according to claim 1, in which the polymer compound does not contain more than 7% of liquid components at 20° C.

16. Rotary vacuum vessel closure according to claim 1, which is pasteurizable.

17. Rotary vacuum vessel closure according to claim 1, showing vacuum retention.

18. Rotary vacuum vessel closure according to claim 1, in which the polymer compound has a compression set (ASTM D395-97 Method B) of a maximum of 50% at 23° C.

Description

[0069] In preferred embodiments of the invention, the co-PP can be partially replaced by other polymers, for example by LLDPE.

[0070] The polymer materials can withstand hot filling of up to 100° C. for up to 60 min.

[0071] Optionally, pigments, preferably inorganic pigments, can also be added to the formulations of the compounds to exclude pigment migration. It has also been shown that other additives such as (unsaturated) fat-containing acid amides, waxes, silicones and other common additives can be added to the polymer compounds in order to improve, for example, processing and performance properties.

[0072] 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 stated above:

Exemplary Embodiment 1

[0073] 40% co-PP [0074] 10% SEBS [0075] 47% OBC [0076] 3% lubricant

Exemplary Embodiment 2

[0077] 30% co-PP [0078] 40% SEBS [0079] 30% LLDPE

Exemplary Embodiment 3

[0080] 60% co-PP [0081] 40% SEBS