Patent 5278272 Issued on January 11, 1994. Estimated Expiration Date: September 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Elastic substantially linear olefin polymers are disclosed which have very good processability, including processing indices (PI's) less than or equal to 70 percent of those of a comparative linear olefin polymer and a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a traditional linear olefin polymer at about the same I2 and Mw /Mn. The novel polymers have higher low/zero shear viscosity and lower high shear viscosity than comparative linear olefin polymers.
Other References
Journal of Polymer Science, Part A, vol. 1, (pp. 2869-2880 (1963)), "Long-Chain Branching Frequency in Polyethylene" by J. E. Guillet
Polymer Preprints, Amer. Chem. Society, vol. 12, No. 1, pp. 277-281 (Mar. 1971), "Evidence of Long-Chain Branching in High Density Polyethylene" by E. E. Drott and R. A. Mendelson
Journal of the American Chemical Society, 98.7, pp. 1729-1742 (Mar. 31, 1976), "Structure and Chemistry of Bis(cyclopentadienyl)-MLn Complexes" by Joseph W. Lauher and Roald Hoffman
Polymer Engineering and Science, vol. 16, No. 12, pp. 811-816 (Dec. 1976), "Influence of Long-Chain Branching on the Viscoelastic Properties of Low-Density Polyethylenes" by L. Wild, R. Ranganath, and D. Knobeloch
Angew. Chem. Int. Ed. Engl. pp. 630-632 (1976) vol. 15, No. 10 "Halogen-Free Soluble Ziegler Catalysts for the Polymerization of Ethylene, Control of Molecular Weight by Choice of Temperature" by Arne Andresen et al
Advances in Organometallic Chemistry, pp. 99-148, vol. 18, (1980) "Ziegler-Natta Catalysis" by Hansjorg Sinn and Walter Kaminsky
Angew. Chem. Int. Ed. Engl., pp. 390-393, vol. 19 No. 5 (1980) "Living Polymers on Polymerization with Extermely Productive Ziegler Catalysis" by Hansjorg Sinn, Walter Kaminsky, Hans-Jurgen Vollmer, and Rudiger Woldt
Polymer Bulletin, 9, pp. 464-469 (1983) "Halogen Free Soluble Ziegler Catalysts with Methylalumoxan as Catalyst" by Jens Herwig and Walter Kaminsky
Makromol. Chem., Rapid Commun., 4, pp. 417-421 (1983) "Bis(cyclopentadienyl)zirkon-Verbingungen und Aluminoxan als Ziegler-Katalysatoren fur die Polymerisation und Copolymerisation von Olefinen" by Walter Kaminsky et al
ANTEC Proceedings, pp. 306-309 (1983), "Analysis of Long Chain Branching in High Density Polyethylene" by J. K. Hughes
Makromol. Chem. Rapid Commun., (5) pp. 225-228 (1984) "Influence of hydrogen on the polymerizaton of ethylene with the homogeneous Ziegler system bis(cyclopentadienyl)zirconiumdichloride/aluminoxane" by Walter Kaminsky et al
Journal of Polymer Science, Polymer Chemistry Edition, pp. 2117-2133 (1985) vol. 23, "Homogeneous Ziegler Natta Catalysis 11 Ethylene Polymerization by IVB Transition Metal Complexes/Methyl Aluminoxane Catalyst Systems" by E. Giannetti and R. Mazzocchi
Journal of Applied Polymer Science, pp. 3751-3765 (1985) vol. 30, "On the Effects of Very Low Levels of Long Chain Branching on Rheological Behavior in Polyethylene" by B. H. Bersted
Journal of Polymer Science: Polymer Chemistry Edition, pp. 2151-2164 (1985) vol. 23, "Ethylene Propylene Diene Terpolymers Produced with a Homogeneous and Highly Active Zirconium Catalyst" by Walter Kaminsky et al
The Society of Rheology, pp. 337-357 (1986) vol. 30, "Wall Slip in Viscous Fluids and Influence of Materials of Construction" by A. V. Ramamurthy
Makromol. Chem., Macromol. Symp. 4, pp. 103-118 (1986) "Elastomers by Atactic Linkage of -Olefins Using Soluble Ziegler Catalysts" by W. Kaminsky and M. Schlobohm
Journal of Rheology, 31 (8) pp. 815-834 (1987) "Wall Slip and Extrudate Distortion in Linear Low Density Polyethylene" by D. Kalika and M. Denn
Makromol. Chem., 190, pp. 515-526 (1989) "Copolymerization of Cycloalkenes with Ethylene in Presence of Chiral Zirconocene Catalysts" by W. Kaminsky and R. Spiehl
Journal of Macromolecular Science: Reviews in Macromolecular Chemistry and Physics, C29 (2 & 3), pp. 201 303 (1989) "A Review of High Resolution Liquid 13 Carbon Nuclear Magnetic Resonance Characterizations of Ethylene Based Polymers"
Journal of Non-Newtonian Fluid Mechanics, 36, pp. 255-263 (1990) "Additional Observations on the Surface Melt Fracture Behavior of Linear Low-Density Polyethylene" by R. Moynihan, D. Baird, and R Ramanathan
Makromol. Chem. Rapid Commun., pp. 89-94 (1990) "Terpolymers of Ethylene, Propene and 1,5-Hexadiene Synthesized with Zirconocene/Methylaluminoxane" by W. Kaminsky and H. Drogemuller
Journal of Rheology, 35 (4), 3 (May 1991) pp. 497-552, "Wall Slip of Molten High Density Polyethylene I. Sliding Plate Rheometer Studies" by S. G. Hatzikiriakos and J. M. Dealy
Proceedings of the 1991 IEEE Power Engineering Society, pp. 184-190 (Sep. 22-27, 1991), "New Specialty Linear Polyemrs (SLP) for Power Cables" by Monica Hendewerk and Lawrence Spenadel
Society of Plastic Engineers Proceedings, Polyolefins VII International Conference, Feb. 24-27, 1991. "Structure/Property Relationships in Exxpol™ Polymers" (pp. 45-66) by C. Speed, B. Turdell, A. Mehta, and F. Stehling
High Polymers, vol. XX, "Crystalline Olefin Polymers" Part 1, pp. 495-501
1991 Polymers, Laminations & Coatings Conference, TAPPI Proceedings, presented in Feb., 1991, p. 289-296, "A New Family of Linear Ethylene Polymers wtih Enhanced Sealing Performance" by D. Van der Sanden and R. W. Halle
Society of Plastic Engineers 1991 Specialty Polyolefins Conference Proceedings, pp. 41-55, "The Marketing Challenge Created by Single Site Catalysts in Polyolefins" by M. Jefferies (Sep. 24, 1991
Advances in Polyolefins by R. B. Seymour and T. Cheng,, (1987), pp. 373-380 "Crystallinity and Morphology of Ethyelene -Olefin Copolymers" by P. Schouterden, G. Groeninckx, and H. Reynaers
Advances in Polyolefins, R. B. Seymour and T. Cheng, (1987) "New Catalysis and Process or Ethylene Polyerization," pp. 337-354, by F. Karol, B. Wagner, I. Levine, G. Goeke, and A. Noshay
Advances in Polyolefins, by R. B. Seymour and T. Cheng, (1987), "Polymerization of Olefins with a Homogeneous Zirconium/Alumoxane Catalyst", pp. 361-371 by W. Kaminsky and G. Hahnsen
September 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
