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US 12,679,936 B2Granted
Rare-earth catalysed polyisoprene articles
AssigneeLifeStyles Healthcare Pte. Ltd.
InventorsKC Nguyen, Chayapon Ngowprasert, Chintana Netrung, Atip Boonbumrung, Phetcharat Rabingkao
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Abstract
Disclosed herein is a polymeric article having an elastomeric layer including cured synthetic polyisoprene particles that include a rare earth catalysed polyisoprene. The polyisoprene particles may include sulfur crosslinks and/or may be pre-vulcanized. Also disclosed herein are methods for producing polymeric articles having an elastomeric layer including cured synthetic polyisoprene particles that include a rare earth catalysed polyisoprene.
Claims11
A method for producing a polymeric article, comprising:
- pre-vulcanizing an emulsion comprising a rare earth catalysed polyisoprene material comprising a cis-1,4 isomer content of greater than 97.0% by weight;
- disposing an elastomeric coating of the emulsion comprising the rare earth catalysed polyisoprene material on a former;
- and
- curing the elastomeric coating to form an elastomeric layer of the polymeric article,
- wherein the elastomeric layer comprises cured synthetic polyisoprene particles cross-linked by sulfur and a rare earth element content of greater than or equal to 0.1 mg/kg and less than or equal to 100 mg/kg.
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A condom comprising:
- an elastomeric layer comprising cured synthetic polyisoprene particles that are pre-vulcanized and comprise sulfur crosslinks;
- wherein the synthetic polyisoprene particles comprise a rare earth catalysed polyisoprene material that comprises:
- a cis-1,4 isomer content of greater than 97.0% by weight;
- a trans-1,4 isomer content of 1% by weight or less;
- and
- a 3,4 isomer content of 1% by weight or less.
3 more elements
Dependencies are inferred from the claim text.