Stretched Product Patents (Class 526/348.1)
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Publication number: 20010025089Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst comprising at least one transition metal compound and at least one organometallic co-catalyst compound and tetrahydrofuran in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also disclosed is a process for reducing electrostatic charge in an olefin polymerization medium.Type: ApplicationFiled: March 27, 2001Publication date: September 27, 2001Inventors: Randal Ray Ford, Kenneth Alan Dooley, Jeffrey James Vanderbilt, Roxanna Lea Whitfield, Alan George Wonders
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Patent number: 6294632Abstract: A biaxially oriented polypropylene film which has a melt flow rate (MFR) of from 1 to 12 g/10 min and in which the melt viscosity thereof as measured with a rotational rheometer at a shear rate of 0 rad/sec (&eegr;0), the melt viscosity thereof as measured with the rheometer at a shear rate of 10 rad/sec (&eegr;10), and the MFR thereof satisfy the relationship log[(&eegr;0-&eegr;10)/&eegr;10]+0.7logMFR≦0.7 The biaxially oriented polypropylene film has, when subjected to heat sealing/cutting, a high sealing strength at the heat-sealed part and reduced fluctuations in sealing strength, has excellent stiffness suitable for bag-forming and filling and sealing, and is excellent in transparency and gloss.Type: GrantFiled: January 22, 1999Date of Patent: September 25, 2001Assignee: Chisso CorporationInventors: Yasuhiro Shiraishi, Yuji Ando, Noriaki Saito
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Publication number: 20010016632Abstract: Polyethylene film having a combination of a high melt strength and a high dart impact strength is prepared from a linear low density polyethylene resin having a melt index, (“I2”), of from 0.4 to 1.5 g/10 minutes, a broad molecular weight distribution (of from 3.5 to 7) and a quasi homogeneous comonomer distribution (as evidenced by a copolymer/homopolymer ratio of from 3 to 19). The polyethylene resin is prepared in a dual reactor polymerization process. The film is especially useful for industrial and “heavy duty” packaging applications such as the manufacture of plastic packages used to contain goods for the construction, gardening and agricultural businesses. Examples of such goods include peat moss, fertilizer, soil, sand, salt, fiberglass insulation and crushed stone.Type: ApplicationFiled: March 12, 2001Publication date: August 23, 2001Applicant: NOVA CHEMICALS (INTERNATIONAL) S.A.Inventor: Peter Sipos
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Publication number: 20010012879Abstract: A film containing at least 5 wt % of an aromatic vinyl compound-&agr;-olefin random copolymer having an aromatic vinyl compound content of from 1 to less than 99.9% by molar fraction and having head-to-tail chain structures comprising at least two aromatic vinyl compound units.Type: ApplicationFiled: February 20, 2001Publication date: August 9, 2001Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventors: Toru Arai, Akihiko Nakamura, Shigeru Suzuki, Toshiaki Otsu, Akio Okamoto
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Patent number: 6268438Abstract: A cross-linked or at least partially cross-linked thermoplastic elastomeric composition formed of from 10 to 90 percent of a first polymeric material comprised of ethylene, &agr;-olefin and optionally a non-conjugated diene, and 90 to 10 percent of a second olefin polymeric material, wherein at least one of the first or second polymeric materials is at least partially the product of a metallocene polymerization reaction.Type: GrantFiled: December 16, 1997Date of Patent: July 31, 2001Assignee: ExxonMobil Chemical Patents Inc.Inventors: Maria Dolores Ellul, Donald Ross Hazelton, Charles Cozewith, Aspy Keki Mehta
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Patent number: 6255426Abstract: A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence of an aluminum alkyl based scavenger which polymer has a Melt Index (MI) as herein defined of from 0.1 to 15; a Compositional Distribution Breadth Index (CDBI) as defined herein of at least 70%, a density of from 0.910 to 0.930 g/ml; a Haze value as herein defined of less than 20%; a Melt Index ratio (MIR) as herein defined of from 35 to 80; an averaged Modulus (M) as herein defined of from 20 000 to 60 000 psi (pounds per square inch) and a relation between M and the Dart Impact Strength in g/mil (DIS) complying with the formula: DIS≧0.8×[100+e(11.71−0.000268×M+2.183×10−9×M2)].Type: GrantFiled: March 26, 1998Date of Patent: July 3, 2001Assignee: Exxon Chemical Patents, Inc.Inventors: Ching-Tai Lue, Natalie A. Merrill, Michael E. Muhle, George Alan Vaughan
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Patent number: 6248851Abstract: Elastic fibers and fabrics made from homogeneously branched linear ethylene polymers are disclosed. The elastic fibers and fabrics can be used to produce structures that can have recycle compatibility between elastic and non elastic components. The novel fibers have at least about 50% recovery at 100% strain. The fibers and fabrics are especially useful in making fabricated articles and components thereof (e.g., disposable diapers).Type: GrantFiled: July 30, 1996Date of Patent: June 19, 2001Assignee: The Dow Chemical CompanyInventors: Rexford A. Maugans, Edward N. Knickerbocker, George W. Knight
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Patent number: 6225410Abstract: Ethylene/C6-8 alpha-olefin copolymers are characterized by melt tension, flow activation energy and haze. The copolymers have excellent moldability and produce films of excellent transparency and mechanical strength.Type: GrantFiled: December 23, 1998Date of Patent: May 1, 2001Assignee: Mitsui ChemicalsInventors: Kenji Sugimura, Ken Yoshitsugu, Mamoru Takahashi, Takashi Nakagawa
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Patent number: 6218493Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc.Type: GrantFiled: July 10, 1997Date of Patent: April 17, 2001Assignees: E. I. du Pont de Nemours and Company, University of North CarolinaInventors: Lynda Kaye Johnson, Christopher Moore Killian
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Patent number: 6201079Abstract: A propylene polymer made using a magnesium halide-supported, titanium-containing solid catalyst component having a broad processing window is produced by incorporating into the polymerization catalyst system a selected alkyl methyldimethoxysilane, preferably isobutylmethyl-dimethoxysilane. Useful articles made from such resin include OPP film.Type: GrantFiled: September 23, 1996Date of Patent: March 13, 2001Assignee: BP Amoco CorporationInventors: Jerome Anthony Streeky, Bruce Howard Bersted, John William Blake, Daan Feng, Charles Richard Hoppin, Benjamin Samuel Tovrog
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Patent number: 6197909Abstract: Biaxially stretched, heat shrinkable monolayer and multilayer films comprising very low density polyethylene terpolymers of monomers (a), (b) and (c), where (a) comprises ethylene, (b) comprises a C6-C8 alpha-olefin and (c) comprises 1-butene or 1-hexene, have a very good combination of physical properties and processability including high shrinkage values and puncture resistance.Type: GrantFiled: May 12, 1993Date of Patent: March 6, 2001Assignee: Curwood, Inc.Inventors: Edwin Rogers Smith, Jeffrey Michael Schuetz, Stanley Lustig
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Patent number: 6194532Abstract: Elastic fibers and fabrics made from homogeneously branched linear ethylene polymers are disclosed. The elastic fibers and fabrics can be used to produce structures that can have recycle compatibility between elastic and non elastic components. The novel fibers have at least about 50% recovery at 100% strain. The fibers and fabrics are especially useful in making fabricated articles and components thereof (e.g., disposable diapers).Type: GrantFiled: May 20, 1996Date of Patent: February 27, 2001Assignee: The Dow Chemical CompanyInventors: Rexford A. Maugans, Edward N. Knickerbocker, George W. Knight
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Patent number: 6194501Abstract: Disclosed herein is an olefin copolymer shrink film comprising an &agr;-olefin/aromatic vinyl compound random copolymer. This &agr;-olefin/aromatic vinyl compound random copolymer comprises 99.9 to 58 mol % of structural units derived from ethylene, 0 to 30 mol % of structural units derived from an &agr;-olefin having 3 to 20 carbon atoms (provided that the total of the structural units derived from ethylene and the structural units derived from an &agr;-olefin having 3 to 20 carbon atoms ranges from 99.9 to 88 mol %), and 0.1 to 12 mol % of structural units derived from an aromatic vinyl compound. The &agr;-olefin/aromatic vinyl compound random copolymer has an intrinsic viscosity [&eegr;], as measured in decalin at 135° C., of 0.1 to 10 dl/g and has a melting point, as measured by a differential scanning calorimeter, of 60 to 125° C. The olefin copolymer shrink film is oriented in at least one direction.Type: GrantFiled: September 23, 1998Date of Patent: February 27, 2001Assignee: Mitsui Chemicals IncInventors: Keiji Okada, Kazuyuki Takimoto, Kenichi Morizono
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Patent number: 6194533Abstract: Disclosed is a liner film for bulk container, which comprises a polyethylene (A) prepared by the use of a single site olefin polymerization catalyst such as a metallocene catalyst, said polyethylene (A) having a density of 0.920 to 0.940 g/cm3, MFR of 0.1 to 3.0 g/10 min and a melting point of 115 to 135° C. When the film is heat-sealed, its sealed portion preferably has a tensile strength at break (Ts) of 2.0 to 4.0 kg/15 mm and a tensile elongation at break (EL) of 150 to 600%. The liner film for bulk container has the advantages: the film can be made lightweight by decreasing the film thickness; the film shows such a high heat-sealing strength that the heat-sealed portion is not broken even if no adhesive tape is attached thereto; and a bulk container liner formed from the film can be filled with a content of a higher temperature than the conventional temperature. Also disclosed is a bulk container liner shaping the above film into a bag.Type: GrantFiled: March 30, 1998Date of Patent: February 27, 2001Assignees: Mitsui Chemicals Inc., Kyushu-Taiyoukasei Ltd.Inventors: Toshihiro Nishimura, Hiroshi Inoue, Yoichiro Tsuji, Takashi Hiraoka
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Patent number: 6180731Abstract: Polymers of ethylene are obtainable by polymerization of ethylene and, if desired, further comonomers in the presence of a catalyst system comprising as active constituents I) a Phillips catalyst, II) a solid which is different from I) and comprises a component which is derived from the metallocene complexes of the formula (A) in which the substituents and indices have the following meanings: R1 to R10 are hydrogen, C1-C10-alkyl, 5-to 7-membered cycloalkyl which may in turn bear C1-C6-alkyl groups as substituents, C6-C15-aryl or aryalkyl, where two adjacent radicals may also together form a cyclic group having from 4 to 15 carbon atoms, or Si(R11)3, where R11 is C1-C10-alkyl, C6-C15-aryl or C3-C10-cycloalkyl, or the radicals R4 and R9 together form a group —[Y(R12R13)]m—, where Y is silicon, germanium, tin or carbon, and R12, R13 are hydrogen C1-C10-alky, C3-C10-cycloalyl or C6-C15-aryl, M is a metal of transition groups IV to VIII or a metal of the lanthanideType: GrantFiled: January 22, 1997Date of Patent: January 30, 2001Assignee: BASF AktiengesellschaftInventors: Wolfgang Rohde, Roland Saive, Dieter Lilge, Martin Lux, Peter Bauer
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Patent number: 6172172Abstract: Polyolefin compositions obtained by mixing: (A) A heterogeneous polyolefin composition itself comprising a fraction (A1) which is insoluble in xylene and a fraction (A2) which is soluble in xylene; (B) a polyolefin composition comprising a low density ethylene copolymer (B1) and a propylene copolymer (B2) of relatively high insolubility in xylene; and, optionally, (C) a branched propylene polymer. The films obtained with the said compositions show improved mechanical properties and impact strength when compared with polyethylene-based films.Type: GrantFiled: November 10, 1999Date of Patent: January 9, 2001Assignee: Montell Technology Company BVInventors: Emanuele Burgin, Gianni Perdomi, Claudio Cometto