发明授权
- 专利标题: Films comprising isotactic propylene copolymers
- 专利标题(中): 包含全同立构丙烯共聚物的膜
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申请号: US10967849申请日: 2004-10-18
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公开(公告)号: US06946535B2公开(公告)日: 2005-09-20
- 发明人: Li-Min Tau , Pak-Wing S. Chum , Seema Karande , Clive Bosnyak
- 申请人: Li-Min Tau , Pak-Wing S. Chum , Seema Karande , Clive Bosnyak
- 申请人地址: US MI Midland
- 专利权人: Dow Global Technologies Inc.
- 当前专利权人: Dow Global Technologies Inc.
- 当前专利权人地址: US MI Midland
- 代理机构: Whyte Hirschboeck Dudek SC
- 主分类号: C08F210/06
- IPC分类号: C08F210/06 ; B32B27/32 ; C07F7/00 ; C08F4/643 ; C08F4/659 ; C08F4/6592 ; C08F10/00 ; C08F110/06 ; C08F210/16 ; C08J5/18 ; C08L23/02 ; C08L23/10 ; C08L23/12 ; C08L23/14 ; C08L23/16 ; C08L101/00 ; C09K3/10 ; D01F6/06 ; D01F6/30 ; D01F6/46
摘要:
Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt %) propylene; and (B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative of component (B) unsatuarated comonomers are the C4-20 α-olefins, C4-20 dienes, styrenic compounds, and the like. Preferably, the film has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss of greater than about 65, and (iii) dart value of greater than about 100 g/mil. In one preferred embodiment, the layer comprises a compolymer characterized as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer, i.e., the units derived from ethylene and/or the unsaturated comonomer(s), in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.
公开/授权文献
- US20050054800A1 Films comprising isotactic propylene copolymers 公开/授权日:2005-03-10
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