PVC-Free Closures

摘要

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.

主权项

1. 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.