A brominated butyl rubber composite gasket and a method of making the same

By combining the drug-sealing layer with the puncture surface layer and using specific fillers, the contradiction between puncture resistance and cost control in brominated butyl rubber gaskets is resolved, achieving high efficiency in puncture resistance and sealing performance, making it suitable for insulin pen syringes.

CN119704806BActive Publication Date: 2026-07-24JIANGYIN HAIHUA RUBBER PLASTIC CO LTD
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Patent Information

Application Number
CN202411915160.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2026-07-24
Estimated Expiration
2044-12-24

AI Technical Summary

Technical Problem

Existing brominated butyl rubber gaskets struggle to balance repeated puncture resistance with cost control, especially gaskets with a uniform formulation in the thickness direction, which have issues with puncture force and needle-punch shedding.

Method used

The composite structure of the drug-sealed layer and the puncture surface layer is adopted. The drug-sealed layer uses a small amount of calcined kaolin and montmorillonite, while the puncture surface layer is made of a composite powder containing silica and organosilicon elastomer micro powder. The brominated butyl rubber composite gasket is prepared through a specific vulcanization process.

Benefits of technology

This achieves enhanced safety of the drug-sealed layer and toughening of the puncture surface, improving the puncture resistance and sealing performance of the composite gasket and meeting the usage requirements of insulin pen syringes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of brominated butyl rubber composite gaskets, including along the thickness direction integrated sealing layer and puncture surface layer of medicine connection;The main composition of rubber raw material of sealing layer of medicine connection is: brominated butyl rubber 100 parts, magnesium oxide 2.5~6 parts, sulfur 0.1~0.4 parts, calcined kaolin 30~45 parts, montmorillonite 20~35 parts, inorganic colorant 0~5 parts, polyethylene wax powder 2~3 parts;The main composition of rubber raw material of puncture surface layer is: brominated butyl rubber 100 parts, magnesium oxide 2.5~6 parts, sulfur 0.2~0.5 parts, calcined kaolin 40~70 parts, composite powder of white carbon black and silicone elastomer micro powder 20~40 parts, inorganic colorant 0~5 parts, silane coupling agent 0.1~0.5 parts.Brominated butyl rubber composite gasket with two-layer superposition structure has reasonable structure, and the compatibility with medicine and puncture resistance meet the use requirements of insulin pen test injector.
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Citation Information

Patent Citations

  • Production method of fine rubber powder and fine rubber powder produced thereby

    CN101407595A

  • Isoprene-brominated butyl rubber composite film and production method thereof

    CN117601526A