Sealing compounds with scavenger materials of small particle size
US10450448B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Apr 25, 2017 |
| Grant date | Oct 22, 2019 |
| Priority date | — |
| Expiry date | Nov 9, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
PVC-free polymer compound for producing seals containing scavengers for screw caps, in particular twist crown corks, characterized in that the Shore A hardness of the polymer compound lies between 50 and 90 and, in a compression set test analogous to ASTM D395-97, Method B, the polymer compound has a compression set of between 30% and 90% after it has been left for 22 hours at 70° C. under a compression of 25%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.