发明授权
- 专利标题: Polyethylene films exhibiting low blocking force
- 专利标题(中): 聚乙烯薄膜显示出低的阻塞力
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申请号: US773375申请日: 1991-10-07
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公开(公告)号: US5250612A公开(公告)日: 1993-10-05
- 发明人: Lonnie G. Hazlitt , Pak-Wing S. Chum , Seema V. Karande , John E. Lastovica, III , Ian M. Munro
- 申请人: Lonnie G. Hazlitt , Pak-Wing S. Chum , Seema V. Karande , John E. Lastovica, III , Ian M. Munro
- 申请人地址: MI Midland
- 专利权人: The Dow Chemical Company
- 当前专利权人: The Dow Chemical Company
- 当前专利权人地址: MI Midland
- 主分类号: B65D30/02
- IPC分类号: B65D30/02 ; B32B27/32 ; B65D65/02 ; C08F8/00 ; C08F10/02 ; C08F297/08 ; C08J5/18 ; C08L23/00 ; C08L23/04 ; C08L23/08 ; C08L23/20
摘要:
Film having good blocking properties and low coefficient of friction is prepared without the presence of antiblock additives from certain thermoplastic ethylene interpolymer products. The thermoplastic ethylene interpolymer products have a density of about 0.935 g/ml or less, a melt flow ratio. I.sub.10 I.sub.2, of at least about 8, and at least about 0.5 percent by weight of the interpolymer product has a weight average molecular weight of at least about 1,000,000 grams/mole. The interpolymer products are a blend or composite of ethylene polymers or copolymers and comprise at least a first interpolymer of ethylene with at least one alpha-olefin monomer. Preferably, the interpolymer products have a melt index, I.sub.2, of from about 0.1 to about 4 grams/10 minutes. The interpolymer products can be made using discrete polymer blends, or preferably, in a multiple reactor sequence. Blown film made from the interpolymer products is especially useful in grocery sack applications.