发明名称 |
Clear high molecular weight film |
摘要 |
A polymeric multilayer film is disclosed that has improved optical qualities while having structural qualities that are not significantly compromised. The film is composed of outer film layers of a low polydispersity polymer which are placed around at least one inner film layer of a high molecular weight high density polyethylene (HDPE) polymer. The outer film layer polymer has a polydispersity of from about 1 to about 4. In a preferred embodiment this low polydispersity polymer is formed in the presence of a metallocene catalyst. The inner film layer high molecular weight HDPE polymer has a melt index of less than 0.1 and a density of at least about 0.940 g/cm3. Any of the layers of the film may be constructed of polymer blends.
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申请公布号 |
US5989725(A) |
申请公布日期 |
1999.11.23 |
申请号 |
US19970785003 |
申请日期 |
1997.01.16 |
申请人 |
TENNECO PACKAGING |
发明人 |
BULLARD, EDWARD M.;WHITE, THOMAS A. |
分类号 |
B32B27/32;(IPC1-7):B32B27/32 |
主分类号 |
B32B27/32 |
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