[미국특허]
Processes for preparing metallocene-based catalyst systems in cyclohexene
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-004/6592
C08F-210/16
C08F-004/659
출원번호
US-0751226
(2015-06-26)
등록번호
US-9481749
(2016-11-01)
발명자
/ 주소
Clark, Kensha Marie
Yang, Qing
Glass, Gary L.
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
5인용 특허 :
45
초록▼
Methods for preparing metallocene-based catalyst systems containing an activator-support are disclosed. These methods are directed to contacting an activator-support, an organoaluminum compound, and a mixture containing a metallocene compound and cyclohexene or a mixture of cyclohexane and 1-hexene,
Methods for preparing metallocene-based catalyst systems containing an activator-support are disclosed. These methods are directed to contacting an activator-support, an organoaluminum compound, and a mixture containing a metallocene compound and cyclohexene or a mixture of cyclohexane and 1-hexene, resulting in catalyst systems with increased catalytic activity for the polymerization of olefins.
대표청구항▼
1. A process to produce a catalyst composition, the process comprising: (i) contacting an activator-support and an organoaluminum compound for a first period of time to form a precontacted mixture; and(ii) contacting the precontacted mixture with a second mixture comprising cyclohexene and a metallo
1. A process to produce a catalyst composition, the process comprising: (i) contacting an activator-support and an organoaluminum compound for a first period of time to form a precontacted mixture; and(ii) contacting the precontacted mixture with a second mixture comprising cyclohexene and a metallocene compound for a second period of time to form the catalyst composition. 2. The process of claim 1, wherein: the first period of time is at least about 15 seconds; andan activity of the catalyst composition is greater than that of a catalyst system obtained by first combining the activator-support and the second mixture, and then combining the organoaluminum compound, under the same polymerization conditions. 3. The process of claim 1, wherein: the activator-support comprises a fluorided solid oxide, a sulfated solid oxide, a phosphated solid oxide, or a combination thereof; andthe metallocene compound comprises a bridged zirconium or hafnium based metallocene compound with a cyclopentadienyl group and a fluorenyl group. 4. The process of claim 1, wherein an activity of the catalyst composition is greater than that of a catalyst system obtained by using toluene instead of cyclohexene in the second mixture, under the same catalyst preparation and polymerization conditions. 5. The process of claim 1, wherein: a slurry of the activator-support in a hydrocarbon diluent is contacted with the organoaluminum compound in step (i); andthe second mixture comprising cyclohexene and the metallocene compound is a solution. 6. The process of claim 1, wherein the second mixture comprises cyclohexene, 1-hexene, and the metallocene compound. 7. The process of claim 6, wherein: a weight ratio of 1-hexene:cyclohexene in the second mixture is in a range from about 90:10 to about 20:80; andan activity of the catalyst composition is greater than that of a catalyst system obtained by using toluene and 1-hexene instead of cyclohexene and 1-hexene in the second mixture, under the same catalyst preparation and polymerization conditions. 8. A process to produce a catalyst composition, the process comprising contacting, in any order: (a) an activator-support;(b) a mixture comprising cyclohexene and a metallocene compound; and(c) an organoaluminum compound; to produce the catalyst composition. 9. The process of claim 8, wherein: the activator-support comprises a fluorided solid oxide, a sulfated solid oxide, a phosphated solid oxide, or a combination thereof;the organoaluminum compound comprises trimethylaluminum, triethylaluminum, tri-n-propylaluminum, tri-n-butylaluminum, triisobutylaluminum, or any combination thereof; andthe metallocene compound comprises an unbridged zirconium or hafnium based metallocene compound containing two cyclopentadienyl groups, two indenyl groups, or a cyclopentadienyl and an indenyl group. 10. The process of claim 8, wherein an activity of the catalyst composition is greater than that of a catalyst system obtained by using toluene instead of cyclohexene in the mixture, under the same catalyst preparation and polymerization conditions. 11. The process of claim 8, wherein the mixture comprises cyclohexene, 1-hexene, and the metallocene compound. 12. The process of claim 11, wherein: a weight ratio of 1-hexene:cyclohexene in the mixture is in a range from about 90:10 to about 50:50; andan activity of the catalyst composition is greater than that of a catalyst system obtained by using toluene and 1-hexene instead of cyclohexene and 1-hexene in the mixture, under the same catalyst preparation and polymerization conditions. 13. The process of claim 11, wherein the mixture comprising cyclohexene, 1-hexene, and the metallocene compound has less precipitation of the metallocene compound and/or the metallocene compound precipitates at a lower temperature than that of a mixture containing toluene, 1-hexene, and the metallocene compound, when compared at the same metallocene concentration and the same weight ratio of 1-hexene:cyclohexene.
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