发明名称 |
Method for Producing Porous Articles from Ultra High Molecular Weight Polyethylene |
摘要 |
Ultra high molecular weight polyethylene (UHMWPE) polymers that have an average molecular weight of at least 500,000 g/mol and an enthalpy of at least 190 J/g is provided. The UHMWPE polymer may include at least one comonomer. The UHMWPE polymer is used to form a membrane, that, when expanded, has a node and fibril structure. The UHMWPE membrane has an endotherm of about 150° C. associated with the fibrils in the membrane. The membrane has a percent porosity of at least 25%, and in exemplary embodiments, the percent porosity is at least 60%. Additionally, the UHMWPE membrane has a thickness less than 1 mm. An UHMWPE membrane may be formed by lubricating the UHMWPE polymer, subjecting the lubricated polymer to pressure at a temperature below the melting point of the UHMWPE polymer to form a tape, and expanding the tape at a temperature below the melting temperature of the UHMWPE polymer. |
申请公布号 |
US2014212612(A1) |
申请公布日期 |
2014.07.31 |
申请号 |
US201414169039 |
申请日期 |
2014.01.30 |
申请人 |
W. L. Gore & Associates, Inc. |
发明人 |
Sbriglia Guy A. |
分类号 |
B29C44/34;C08F210/02;C08F110/02;B29C43/24;B29C47/00 |
主分类号 |
B29C44/34 |
代理机构 |
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代理人 |
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主权项 |
1. A process for making a porous ultra high molecular weight polyethylene (UHMWPE) membrane comprising:
lubricating an ultra high molecular weight polyethylene polymer having a molecular weight of at least about 500,000 g/mol to form a lubricated polymer; subjecting said lubricated polymer to pressure at a temperature below a first melt temperature of said ultra high molecular weight polyethylene polymer to form a tape; and expanding said tape at a temperature below the melt temperature of said ultra high molecular weight polyethylene polymer to form a porous membrane having structure of nodes interconnected by fibrils. |
地址 |
Newark DE US |