[특허]Peroxide treated metallocene-based polyolefins with improved melt strength

[미국특허] Peroxide treated metallocene-based polyolefins with improved melt strength 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-010/02 C08F-210/16 C08J-005/18 C08K-005/14 B29C-039/00 B29C-049/00 C08F-008/00 B29C-047/00 B29C-047/38 B29C-047/40 B29K-023/00 B29K-105/00 B29L-007/00
출원번호	US-0134464 (2016-04-21)
등록번호	US-9732197 (2017-08-15)
발명자 / 주소	Cui, Lili Sukhadia, Ashish M. Rohatgi, Vivek
출원인 / 주소	Chevron Phillips Chemical Company LP
대리인 / 주소	Merchant & Gould P.C.
인용정보	피인용 횟수 : 1 인용 특허 : 38

초록

Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.

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1. A process for preparing an ethylene polymer having a ratio of Mw/Mn of less than or equal to about 5, a ratio of Mz/Mw of less than or equal to about 2.3, and a zero-shear viscosity at 190° C. of greater than or equal to about 8×104 Pa-sec, the process comprising: contacting a base resin with a peroxide compound at a temperature in a range from about 120 to about 300° C. to generate peroxide groups at about 10-50 ppm of peroxide groups based on the weight of the base resin. 2. The process of claim 1, wherein the step of contacting the base resin with the peroxide compound comprises melt processing a mixture of the base resin and the peroxide compound in a twin screw extrusion system. 3. The process of claim 2, wherein the base resin is produced using a metallocene-based catalyst system. 4. the process of claim 1, wherein the ethylene polymer has from about 0.008 to about 0.04 long chain branches (LCB) per 1000 total carbon atoms. 5. The process of claim 1, wherein: the ratio of Mw/Mn is in a range from about 2 to about 5;the ratio of Mz/Mw is a range from about 1.5 to about 2.3; andthe zero-shear viscosity at 190° C. is in a range from about 8×104 to about 2×106 Pa-sec. 6. The process of claim 5, wherein the ethylene polymer is an ethylene/α-olefin copolymer. 7. The process of claim 6, wherein the ethylene/α-olefin copolymer has: a peak melting point in a range from about 100 to about 120° C.;a difference between the peak melting point and the vicat softening temperature of less than or equal to about 18° C.;a zero-shear viscosity at 190° C. in a range from about 1×105 to about 1×106 Pa-sec; anda CY-a parameter at 190° C. in a range from about 0.08 to about 0.28. 8. The process of claim 5, wherein: the ethylene polymer is an ethylene/α-olefin copolymer characterized by a peak melting point in a range from about 100 to about 120° C., and a difference between the peak melting point and the vicat softening temperature of less than or equal to about 18° C.; andthe base resin is characterized by a peak melting point in a range from about 100 to about 120° C., and a difference between the peak melting point and the vicat softening temperature of less than or equal to about 18° C. 9. The process of claim 5, wherein: the ethylene polymer is an ethylene/α-olefin copolymer characterized by a zero-shear viscosity at 190° C. in a range from about 1×105 to about 1×106 Pa-sec, and a CY-a parameter at 190° C. in a range from about 0.08 to about 0.28; andthe base resin is characterized by a zero-shear viscosity at 190° C. in a range from about 2×103 to about 7×104 Pa-sec, and a CY-a parameter at 190° C. in a range from about 0.4 to about 0.8. 10. The process of claim 5, wherein: the ethylene polymer has from about 0.009 to about 0.035 long chain branches (LCB) per 1000 total carbon atoms; andthe base resin has less than about 0.005 long chain branches (LCB) per 1000 total carbon atoms. 11. The process of claim 1, wherein the ethylene polymer has: a ratio of Mw/Mn in a range from about 2.1 to about 3.5;a ratio of Mz/Mw in a range from about 1.5 to about 2.2;a melt index in a range from 0 to about 1; anda zero-shear viscosity at 190° C. in a range from about 1×105 to about 1×106 Pa-sec. 12. The process of claim 11, wherein the ethylene polymer has a CY-a parameter at 190° C. in a range from about 0.1 to about 0.2. 13. The process of claim 11, wherein the ethylene polymer has from about 0.01 to about 0.03 long chain branches (LCB) per 1000 total carbon atoms. 14. The process of claim 11, wherein the ethylene polymer has a peak melting point in a range from about 105 to about 120° C. 15. The process of claim 11, wherein the ethylene polymer is an ethylene/α-olefin copolymer with a density in a range from about 0.91 to about 0.92 g/cm3. 16. The process of claim 15, wherein the ethylene/α-olefin copolymer is an ethylene/1-hexene copolymer. 17. The process of claim 11, wherein the base resin has: a ratio of Mw/Mn in a range from about 2 to about 3.5;a ratio of Mz/Mw in a range from about 1.5 to about 2.2; anda melt index in a range from about 0.5 to about 2. 18. The process of claim 17, wherein the base resin has: a zero-shear viscosity at 190° C. in a range from about 3×103 to about 2×104 Pa-sec;a CY-a parameter at 190° C. in a range from about 0.5 to about 0.8; andless than about 0.005 long chain branches (LCB) per 1000 total carbon atoms. 19. The process of claim 1, wherein the ethylene polymer is an ethylene/1-hexene copolymer characterized by: a ratio of Mw/Mn in a range from about 2 to about 3.5;a ratio of Mz/Mw in a range from about 1.5 to about 2.2; anda density in a range from about 0.905 to about 0.925 g/cm3. 20. The process of claim 19, wherein the ethylene/1-hexene copolymer has: a zero-shear viscosity at 190° C. in a range from about 1×105 to about 1×106 Pa-sec;a CY-a parameter at 190° C. in a range from about 0.08 to about 0.28; andfrom about 0.008 to about 0.04 long chain branches (LCB) per 1000 total carbon atoms.

이 특허에 인용된 특허 (38) 인용/피인용 타임라인 분석

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Cui, Lili; Sukhadia, Ashish M.; Rohatgi, Vivek, Peroxide treated metallocene-based polyolefins with improved melt strength.
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[미국특허] Peroxide treated metallocene-based polyolefins with improved melt strength 원문보기

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[미국특허] Peroxide treated metallocene-based polyolefins with improved melt strength 원문보기

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