[미국특허]
Higher density polyolefins with improved stress crack resistance
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-023/08
C08F-210/16
C08F-004/653
C08F-004/6592
C08F-004/659
C08F-210/02
출원번호
US-0018455
(2013-09-05)
등록번호
US-9156970
(2015-10-13)
발명자
/ 주소
Hlavinka, Mark L.
Ding, Errun
DesLauriers, Paul
Inn, Yongwoo
Cui, Lili
Yang, Qing
Sukhadia, Ashish
St. Jean, Guylaine
Buck, Richard M.
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
10인용 특허 :
56
초록▼
Disclosed herein are polymerization processes for the production of olefin polymers. These polymerization processes can employ a catalyst system containing two or three metallocene components, resulting in ethylene-based copolymers that can have a medium density and improved stress crack resistance.
Disclosed herein are polymerization processes for the production of olefin polymers. These polymerization processes can employ a catalyst system containing two or three metallocene components, resulting in ethylene-based copolymers that can have a medium density and improved stress crack resistance.
대표청구항▼
1. An ethylene polymer having a density from about 0.930 to about 0.948 g/cm3, a zero-shear viscosity greater than about 5×105 Pa-sec, a CY-a parameter in a range from about 0.01 to about 0.40, a peak molecular weight (Mp) in a range from about 30,000 to about 130,000 g/mol, a bimodal molecular weig
1. An ethylene polymer having a density from about 0.930 to about 0.948 g/cm3, a zero-shear viscosity greater than about 5×105 Pa-sec, a CY-a parameter in a range from about 0.01 to about 0.40, a peak molecular weight (Mp) in a range from about 30,000 to about 130,000 g/mol, a bimodal molecular weight distribution, and a reverse comonomer distribution. 2. The polymer of claim 1, wherein the ethylene polymer has a density in a range from about 0.933 to about 0.946 g/cm3. 3. The polymer of claim 1, wherein the ethylene polymer has: a natural draw ratio (NDR) in a range from about 400 to about 525%; anda single point notched constant tensile load (SP-NCTL) of at least 8,000 hours. 4. The polymer of claim 1, wherein the ethylene polymer has: a HLMI in a range from about 1 to about 20 g/10 min;a ratio of Mw/Mn in a range from about 5 to about 25;a ratio of Mz/Mw in a range from about 4.5 to about 7.5; anda Mn in a range from about 8,000 to about 60,000 g/mol. 5. The polymer of claim 1, wherein the ethylene polymer has: a density in a range from about 0.935 to about 0.946 g/cm3;a zero-shear viscosity in a range from about 7.5×105 to about 1×109 Pa-sec;a CY-a parameter in a range from about 0.08 to about 0.35; anda Mp in a range from about 35,000 to about 120,000 g/mol. 6. The polymer of claim 1, wherein a relationship between natural draw ratio (NDR, %) and density (g/cm3) of the ethylene polymer is defined by the equation: NDR<7800(density)−6800. 7. The polymer of claim 1, wherein the ethylene polymer is an ethylene/l-butene copolymer, an ethylene/l-hexene copolymer, or an ethylene/l-octene copolymer. 8. An article comprising the ethylene polymer of claim 1. 9. An ethylene polymer having a density from about 0.930 to about 0.948 g/cm3, a bimodal molecular weight distribution, a single point notched constant tensile load (SP-NCTL) of at least 6,500 hours, and a natural draw ratio (NDR) of less than or equal to about 525%. 10. The polymer of claim 9, wherein the ethylene polymer has: a density in a range from about 0.933 to about 0.946 g/cm3;a natural draw ratio (NDR) in a range from about 400 to about 525%; anda single point notched constant tensile load (SP-NCTL) of at least 9,000 hours. 11. The polymer of claim 9, wherein the ethylene polymer has: a HLMI in a range from 0 to about 50 g/10 min;a ratio of Mw/Mn in a range from about 10 to about 50;a ratio of Mz/Mw in a range from about 2.4 to about 8; anda Mn in a range from about 5,000 to about 25,000 g/mol. 12. The polymer of claim 9, wherein a relationship between natural draw ratio (NDR, %) and density (g/cm3) of the ethylene polymer is defined by the equation: NDR<13404(density)−12050. 13. The polymer of claim 9, wherein the ethylene polymer is an ethylene/l-butene copolymer, an ethylene/l-hexene copolymer, or an ethylene/l-octene copolymer. 14. An article comprising the ethylene polymer of claim 9. 15. The polymer of claim 1, wherein the ethylene polymer has: a density in a range from about 0.935 to about 0.946 g/cm3;a zero-shear viscosity in a range from about 7.5×105 to about 1×109 Pa-sec;a CY-a parameter in a range from about 0.08 to about 0.35;a Mp in a range from about 40,000 to about 110,000 g/mol; anda ratio of Mw/Mn in a range from about 7 to about 20. 16. The polymer of claim 15, wherein the ethylene polymer is an ethylene/l-butene copolymer, an ethylene/l-hexene copolymer, or an ethylene/l-octene copolymer. 17. An article comprising the ethylene polymer of claim 16. 18. The polymer of claim 9, wherein the ethylene polymer has: a density in a range from about 0.935 to about 0.946 g/cm3;a Mn in a range from about 5,000 to about 25,000 g/mol;a natural draw ratio (NDR) in a range from about 400 to about 525%; anda single point notched constant tensile load (SP-NCTL) of at least 9,000 hours. 19. The polymer of claim 18, wherein the ethylene polymer is an ethylene/l-butene copolymer, an ethylene/l-hexene copolymer, or an ethylene/l-octene copolymer. 20. An article comprising the ethylene polymer of claim 19.
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상세보기
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