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US 5,962,094 AGranted
Mechanically sealing closure for receptables
AssigneePPG Industries Ohio, Inc.
InventorsDoris Osterkamp, Peter Nussen
Life of this patent
Estimating the term…
Abstract
The present invention relates to a closure giving a tight mechanical seal and preferably made from metal or plastic, with an insert on its inner side as a sealing element for containers, in particular for bottles and glassware, where the insert is composed of at least one polyolefin which can be prepared using catalysts selected from the class consisting of the metallocenes.
Claims7
A closure configured to mechanically seal an opening defined in a container, said closure comprising:
- a. a closure body, and
- b. a sealing element comprising:
- i. from 85 to 15% by weight of at least one polyolefin prepared by using at least one catalyst selected from the group consisting of metallocenes,
- ii. from 15 to 35% by weight of at least one polypropylene copolymer, and
- iii. a synthetic rubber.
2 more elements
A process for producing a closure configured to mechanically seal an opening defined in a container, said process comprising:
- a. preparing a closure body having an outer surface and an inner surface,
- b. preparing a sealing element comprising:
- i. from 85 to 15% by weight of at least one polyolefin prepared by using at least one catalyst selected from the group consisting of metallocenes,
- ii. from 15 to 35% by weight of at least one polypropylene copolymer, and
- iii. a synthetic rubber, and
- c. inserting the sealing element on the inner surface of the closure body.
3 more elements
Dependencies are inferred from the claim text.