Enhanced ESCR bimodal HDPE for blow molding applications

Details Enhanced ESCR bimodal HDPE for blow molding applications Enhanced ESCR bimodal HDPE for blow molding applications

2005-06-14

2008-10-07

Nutter, Nathan M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000

Reexamination Certificate

active

07432328

ABSTRACT:
Bimodal polyethylene compositions and blow molded bottles made therefrom are provided. In at least one specific embodiment, the composition includes at least one high molecular weight polyethylene component having a molecular weight distribution (MWD) of about 6 to about 9, a short chain branch content of less than about 2 branches per 1,000 main chain carbons, and a Mz of about 1,100,000 or more. The composition also includes at least one low molecular weight polyethylene component where a ratio of weight average molecular weight of the high molecular weight polyethylene component to weight average molecular weight of the low molecular weight polyethylene component is about 20 or less. The composition has a density of about 0.94 g/cc or more, an ESCR of about 600 hours or more, and a percent die swell of about 70% or more.

REFERENCES:
patent: 4461873 (1984-07-01), Bailey et al.
patent: 4547551 (1985-10-01), Bailey et al.
patent: 4960741 (1990-10-01), Bailly et al.
patent: 5260384 (1993-11-01), Morimoto et al.
patent: 5288933 (1994-02-01), Kao et al.
patent: 5352749 (1994-10-01), DeChellis et al.
patent: 5525678 (1996-06-01), Mink et al.
patent: 5677375 (1997-10-01), Rifi et al.
patent: 5889128 (1999-03-01), Schrock et al.
patent: 5908679 (1999-06-01), Berthold et al.
patent: 6201078 (2001-03-01), Breulet et al.
patent: 6242543 (2001-06-01), Follestad et al.
patent: 6271325 (2001-08-01), McConville et al.
patent: 6472484 (2002-10-01), Abe et al.
patent: 6545093 (2003-04-01), de Lange et al.
patent: 6562905 (2003-05-01), Nummila-Pakarinen et al.
patent: 6579922 (2003-06-01), Laurent
patent: 6605675 (2003-08-01), Mawson et al.
patent: 6608149 (2003-08-01), Mawson et al.
patent: 6642313 (2003-11-01), Kazakov et al.
patent: 2004/0048736 (2004-03-01), Mink et al.
patent: 0 517 868 (1994-07-01), None
patent: 739937 (1996-10-01), None
patent: WO 99/01460 (1999-01-01), None
Davey, Chris, R., et al., “Engineered Catalyst For Controlled Bimodal Structures in UNIPOL Single Reactor Gas Phase Polyethylene,” SPE-Polyolefins 2002 International Conference Feb. 25-27, 2002.
Scheirs, John, et al., “PE100 Resins for Pipe Applications: Continuing the Development into the 21stCentury” TRIP vol. 4, No. 12, 408-415 (1996).
Berthold, J. et al. “Advanced Polymerisation process for tailor made pipe resins” Plast., Rubber Compos. Process. Appl., pp. 368-372 (1996).
Ebner, K., “Bi-Modal HDPE for Piping Systems and Further Applications” Adv. Plast. Technol. Apt '97, Int. Conf., pp. 1-8 (1997).
Zabusky, H.H., et al. “Properties of High Density Polyethylene with Bimodal Molecular Weight Distribution” SPE Transactions, pp. 17-21 (1964).
Böhm, L.L. et al., “The Industrial Synthesis of Bimodal Polyethylene Grades with Improved Properties” Studies in Surface Science and Catalysis, Catalyst Design for Tailor-Made Polyolefinsm pp. 351-363 (1994).
“Designation: D 1693-01; Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics,”ASTM International, pp. 1-12 (PA).

Affiliated with

Also associated with

Rating

Enhanced ESCR bimodal HDPE for blow molding applications does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Enhanced ESCR bimodal HDPE for blow molding applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhanced ESCR bimodal HDPE for blow molding applications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4014339