[특허]Polymers with improved processability for pipe applications

[미국특허] Polymers with improved processability for pipe applications 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-210/16 C08L-023/08 C08F-004/65 C08F-004/659 C08F-004/6592
출원번호	US-0522991 (2014-10-24)
등록번호	US-9828451 (2017-11-28)
발명자 / 주소	Rohatgi, Vivek Inn, Yongwoo Sukhadia, Ashish M. Yang, Qing DesLauriers, Paul J.
출원인 / 주소	Chevron Phillips Chemical Company LP
대리인 / 주소	Conley Rose, P.C.
인용정보	피인용 횟수 : 1 인용 특허 : 60

초록 ▼

A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of f

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1. A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component; wherein the HMW component is present in an amount of from 10 wt. % to 30 wt. %; wherein the LMW component is present in an amount of from 70 wt. % to 90 wt. %; wherein the copolymer has gels present in an amount of less than 300/sq. ft., wherein the gels have a size greater than 200 microns; wherein the copolymer has a high load melt index of from 6 g/10 min to 25 g/10 min, when tested in accordance with ASTM D1238 under a force of 21.6 kg; wherein the copolymer has a melt index of from 0.2 g/10 min to 0.8 g/10 min, when tested in accordance with ASTM D1238 under a force of 2.16 kg; and wherein the copolymer has a density of from 0.925 g/cc to 0.945 g/cc, when tested in accordance with ASTM D1505. 2. The copolymer of claim 1 which when tested in accordance with ASTM D638 and/or ISO 527 has a Young's modulus of from 120 kpsi to 190 kpsi. 3. The copolymer of claim 1 having a viscous relaxation time of from 0.5 s to about 8 s. 4. The copolymer of claim 1 having an η0 (eta_0) of from 5.0×104 Pa-s to 8.0×105 Pa-s. 5. The copolymer of claim 1 having an η100 (eta_100) of from 1,000 Pa-s to 4,000 Pa-s. 6. The copolymer of claim 1 which when tested in accordance with ASTM D638 and/or ISO 527 has a percent elongation at break of from 450% to 800%. 7. The copolymer of claim 1 which when tested in accordance with ASTM D638 and/or ISO 527 has a percent elongation at yield of from 8.0% to 20%. 8. The copolymer of claim 1 which when tested in accordance with ASTM D638 and/or ISO 527 has a tensile strength at break of from 3,500 psi to 6,000 psi. 9. The copolymer of claim 1 which when tested in accordance with ASTM D638 and/or ISO 527 has a tensile strength at yield of from 2,600 psi to 3,000 psi. 10. The copolymer of claim 1 which when tested in accordance with ASTM D3895 has an oxidative induction time of greater than 100 min. 11. The copolymer of claim 1 which when tested in accordance with ASTM D3895 has an oxidative induction temperature of greater than 220° C. 12. The copolymer of claim 1 which when tested in accordance with ASTM F2231 has a Charpy impact energy of from 0.9 J to 3.0 J. 13. The copolymer of claim 1 which when tested in accordance with ASTM F2231 has a Charpy temperature of from 35° C. to 10° C. 14. The copolymer of claim 1 which when tested in accordance with ASTM D638 has a tensile natural draw ratio of from 380% to 500%. 15. The copolymer of claim 1 which when tested in accordance with ASTM F1473 has a resistance to slow crack growth of greater than 500 h, wherein the resistance to slow crack growth is defined as the PENT failure time. 16. The copolymer of claim 1 which when tested in accordance with ISO 13477 has a S4 critical temperature of from 30° C. to 10° C. for a 2″DR11 pipe. 17. The copolymer of claim 1 which when tested in accordance with ISO 13477 has a S4 critical pressure of greater than 12 bar as determined at 0° C. for a 2″DR11 pipe. 18. The copolymer of claim 1 having a molecular weight distribution of from 4 to 18.

이 특허에 인용된 특허 (60) 인용/피인용 타임라인 분석

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Rohatgi, Vivek; Inn, Yongwoo; Sukhadia, Ashish M.; Yang, Qing; DesLauriers, Paul J., Polymers with improved processability for pipe applications.
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[미국특허] Polymers with improved processability for pipe applications 원문보기

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