发明申请
- 专利标题: Elastomeric Polymer Blends and Processes for Their Production
- 专利标题(中): 弹性体聚合物共混物及其制备方法
-
申请号: US13015364申请日: 2011-01-27
-
公开(公告)号: US20110207888A1公开(公告)日: 2011-08-25
- 发明人: Rainer Kolb , John W. Chu , Gabor Kiss , Robert P. Reynolds, JR. , Jean-Roch Schauder , Thomas T. Sun
- 申请人: Rainer Kolb , John W. Chu , Gabor Kiss , Robert P. Reynolds, JR. , Jean-Roch Schauder , Thomas T. Sun
- 主分类号: C08L23/14
- IPC分类号: C08L23/14 ; C08J5/00
摘要:
Elastomeric polymer blends and processes for their production are described. Specifically, the polymer blends comprise a first polymer and a second polymer, where the first polymer comprises from about 70 wt % to about 90 wt % units derived from propylene and from about 10 wt % to about 30 wt % units derived from ethylene and/or a C4-C10 alpha-olefin, and the second polymer comprises from about 88 wt % to about 98 wt % units derived from propylene and from about 2 wt % to about 12 wt % units derived from ethylene and/or a C4-C10 alpha-olefin. The elastomeric polymer blends are further characterized by having two or more of the following properties: an overall propylene content of between about 75 wt % and about 90 wt %, a melting point between about 110° C. and about 145° C., a Vicat softening point greater than about 45° C., a tensile stress at 300% strain of less than about 500 psi (3447 kPa), as determined by a stress strain test according to ASTM D412, or an average maximum force for pellet separation of less than about 10 N in an accelerated storage stability test. The polymer blends are produced in a dual reactor process, in which the first polymer and the second polymer are prepared using differing catalyst systems.