[미국특허]
Polymers with improved ESCR for blow molding applications
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-210/16
C08F-004/64
C08F-010/14
C08F-010/08
출원번호
US-0859638
(2015-09-21)
등록번호
US-9475898
(2016-10-25)
발명자
/ 주소
Rohatgi, Vivek
Greco, Jeffrey F.
Inn, Yongwoo
Yang, Qing
Brown, Jr., Alfred E.
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Merchant & Gould PC
인용정보
피인용 횟수 :
2인용 특허 :
68
초록▼
Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. Thes
Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. These polymers have the processability of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
대표청구항▼
1. A polymerization process comprising: contacting a catalyst composition with ethylene and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer; wherein the ethylene polymer comprises a higher molecular weight component and a lower mo
1. A polymerization process comprising: contacting a catalyst composition with ethylene and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer; wherein the ethylene polymer comprises a higher molecular weight component and a lower molecular weight component, and wherein the ethylene polymer is characterized by: a density in a range from about 0.95 to about 0.965 g/cm3;a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min;a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175;a bimodal molecular weight distribution;less than about 0.008 long chain branches per 1000 total carbon atoms;a number of short chain branches per 1000 total carbon atoms at Mz that is greater than or equal to the number at Mn; anda slope of a plot of the viscosity (Pa-sec) versus shear rate (sec−1) at 190° C. of the ethylene polymer at 100 sec−1 in a range from about 0.42 to about 0.65. 2. The process of claim 1, wherein the polymerization reactor system comprises a slurry reactor, a gas-phase reactor, a solution reactor, or a combination thereof. 3. The process of claim 1, wherein the polymerization reactor system comprises a loop slurry reactor. 4. The process of claim 1, wherein the polymerization reactor system comprises one or two reactors. 5. The process of claim 1, wherein the olefin comonomer comprises a C3-C10 alpha-olefin. 6. The process of claim 1, wherein the catalyst composition comprises two metallocene compounds, an activator, and an optional co-catalyst. 7. The process of claim 6, wherein the activator comprises an aluminoxane, an activator-support comprising a solid oxide treated with an electron-withdrawing anion, or a combination thereof. 8. The process of claim 1, wherein the catalyst composition comprises: a first metallocene compound comprising an unbridged zirconium or hafnium based metallocene compound containing two cyclopentadienyl groups, two indenyl groups, or a cyclopentadienyl and an indenyl group;a second metallocene compound comprising a bridged zirconium or hafnium based metallocene compound with a cyclopentadienyl group and a fluorenyl group;an activator-support comprising a fluorided solid oxide, a sulfated solid oxide, a phosphated solid oxide, or a combination thereof; andan organoaluminum co-catalyst. 9. A polymerization process comprising: contacting a catalyst composition with ethylene and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer; wherein the ethylene polymer comprises a higher molecular weight component and a lower molecular weight component, and wherein the ethylene polymer is characterized by: a density in a range from about 0.95 to about 0.965 g/cm3;a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min;a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175;a Mp of the higher molecular weight component in a range from about 650,000 to about 1,100,000 g/mol;a Mp of the lower molecular weight component in a range from about 40,000 to about 80,000 g/mol;less than about 0.008 long chain branches per 1000 total carbon atoms;a number of short chain branches per 1000 total carbon atoms at Mz that is greater than or equal to the number at Mn; anda ratio of Mw/Mn in a range from about 5 to about 18. 10. The process of claim 9, wherein the polymerization reactor system comprises a slurry reactor, a gas-phase reactor, a solution reactor, or a combination thereof. 11. The process of claim 9, wherein the polymerization reactor system comprises a loop slurry reactor. 12. The process of claim 9, wherein the polymerization reactor system comprises one or two reactors. 13. The process of claim 9, wherein the olefin comonomer comprises a C3-C10 alpha-olefin. 14. The process of claim 9, wherein the catalyst composition comprises two metallocene compounds, an activator, and an optional co-catalyst. 15. The process of claim 14, wherein the activator comprises an aluminoxane, an activator-support comprising a solid oxide treated with an electron-withdrawing anion, or a combination thereof. 16. The process of claim 9, wherein the catalyst composition comprises: a first metallocene compound comprising an unbridged zirconium or hafnium based metallocene compound containing two cyclopentadienyl groups, two indenyl groups, or a cyclopentadienyl and an indenyl group;a second metallocene compound comprising a bridged zirconium or hafnium based metallocene compound with a cyclopentadienyl group and a fluorenyl group;an activator-support comprising a fluorided solid oxide, a sulfated solid oxide, a phosphated solid oxide, or a combination thereof; andan organoaluminum co-catalyst. 17. An ethylene/α-olefin copolymer comprising a higher molecular weight component and a lower molecular weight component, wherein the ethylene/α-olefin copolymer is characterized by: a density in a range from about 0.95 to about 0.965 g/cm3;a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min;a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175;a bimodal molecular weight distribution;a Mp of the higher molecular weight component in a range from about 650,000 to about 1,100,000 g/mol;a Mp of the lower molecular weight component in a range from about 40,000 to about 80,000 g/mol;a ratio of Mw/Mn in a range from about 5 to about 18;less than about 0.008 long chain branches per 1000 total carbon atoms;a number of short chain branches per 1000 total carbon atoms at Mz that is greater than or equal to the number at Mn; anda slope of a plot of the viscosity (Pa-sec) versus shear rate (sec−1) at 190° C. of the ethylene/α-olefin copolymer at 100 sec−1 in a range from about 0.42 to about 0.65. 18. A blow molded article comprising the ethylene/α-olefin copolymer of claim 17. 19. The article of claim 18, wherein the ethylene/α-olefin copolymer is an ethylene/1-butene copolymer, an ethylene/1-hexene copolymer, or an ethylene/1-octene copolymer. 20. The article of claim 18, wherein the blow molded article is a bottle or a container.
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