[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-004/6592
C08F-004/659
C08F-210/02
C08J-005/00
출원번호
US-0842888
(2015-09-02)
등록번호
US-9394393
(2016-07-19)
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 :
3인용 특허 :
59
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/α-olefin copolymer having a density from about 0.935 to about 0.947 g/cm3, a zero-shear viscosity in a range from about 1×106 to about 1×109 Pa-sec, a CY-a parameter in a range from about 0.08 to about 0.35, a peak molecular weight (Mp) in a range from about 35,000 to about 100,000 g/
1. An ethylene/α-olefin copolymer having a density from about 0.935 to about 0.947 g/cm3, a zero-shear viscosity in a range from about 1×106 to about 1×109 Pa-sec, a CY-a parameter in a range from about 0.08 to about 0.35, a peak molecular weight (Mp) in a range from about 35,000 to about 100,000 g/mol, a bimodal molecular weight distribution, and a number of short chain branches per 1000 total carbon atoms at Mz that is greater than at Mn. 2. The copolymer of claim 1, wherein the copolymer 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 9,000 hours. 3. An article comprising the copolymer of claim 1. 4. The article of claim 3, wherein the copolymer is an ethylene/1-butene copolymer, an ethylene/1-hexene copolymer, or an ethylene/1-octene copolymer. 5. The copolymer of claim 1, wherein the copolymer has: a HLMI in a range from about 5 to about 18 g/10 min;a ratio of Mw/Mn in a range from about 7 to about 22; anda Mn in a range from about 15,000 to about 55,000 g/mol. 6. The copolymer of claim 5, wherein the copolymer is an ethylene/1-butene copolymer, an ethylene/1-hexene copolymer, or an ethylene/1-octene copolymer. 7. An article comprising the copolymer of claim 5. 8. An ethylene/α-olefin copolymer having a density from about 0.935 to about 0.947 g/cm3, a bimodal molecular weight distribution, a single point notched constant tensile load (SP-NCTL) of at least 8,500 hours, and a natural draw ratio (NDR) in a range from about 400 to about 525%. 9. The copolymer of claim 8, wherein the copolymer has a single point notched constant tensile load (SP-NCTL) of at least 10,000 hours. 10. The copolymer of claim 8, wherein the copolymer has a density in a range from about 0.936 to about 0.944 g/cm3. 11. An article comprising the copolymer of claim 8. 12. The article of claim 11, wherein the copolymer is an ethylene/1-butene copolymer, an ethylene/1-hexene copolymer, or an ethylene/1-octene copolymer. 13. The copolymer of claim 8, wherein the copolymer 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. 14. An ethylene/α-olefin copolymer having a density from about 0.930 to about 0.948 g/cm3, a Mn in a range from about 5,000 to about 30,000 g/mol, a ratio of Mw/Mn in a range from about 10 to about 50, and a relationship between natural draw ratio (NDR, %) and density (g/cm3) of the copolymer defined by the equation: NDR<7800(density)−6800. 15. The copolymer of claim 14, wherein the copolymer has a bimodal molecular weight distribution and a density in a range from about 0.935 to about 0.947 g/cm3. 16. The copolymer of claim 14, wherein the copolymer 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. 17. The copolymer of claim 14, wherein the copolymer has a single point notched constant tensile load (SP-NCTL) of at least 9,000 hours. 18. The copolymer of claim 14, wherein a relationship between the natural draw ratio (NDR, %) and the density (g/cm3) of the copolymer is further defined by the equation: NDR<13404(density)−12090. 19. An article comprising the copolymer of claim 14.
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상세보기
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