Material Contains Halogenated Hydrocarbon Wherein At Least One Halogen Atom Is Other Than Chlorine, And Mixtures Of Water And A Halogenated Hydrocarbon One Ethylenic Monomer Patents (Class 526/206)
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Patent number: 6515083Abstract: A process for producing an isobutylene block copolymer, which comprises performing cationic polymerization of a monomer component containing isobutylene as a major monomer and a monomer component whose major monomer is not isobutylene in the presence of an initiator, wherein the polymerization is carried out in a mixed solvent containing a monohalogenated hydrocarbon solvent and a non-halogenated hydrocarbon solvent the monohalogenated hydrocarbon solvent containing a primary monohalogenated hydrocarbon having three to eight carbon atoms and/or a secondary monohalogenated hydrocarbon having three to eight carbon atoms, the non-halogenated hydrocarbon solvent containing an aliphatic hydrocarbon and/or an aromatic hydrocarbon.Type: GrantFiled: February 21, 2001Date of Patent: February 4, 2003Assignee: Kaneka CorporationInventors: Shinji Ozawa, Toshinobu Nakata, Tomoki Hiiro, Taizo Aoyama
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Publication number: 20030013791Abstract: The invention provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97.5 mole percent (mol %) tetrafluoroethylene (TFE), about 2 to about 3 mol % perfluoro (propyl vinyl ether) (PPVE), and about 0.5 to about 3 mol % hexafluoropropylene (HFP). The invention also provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97 mol % TFE, about 0.75 to about 3 mol % PPVE, and about 1.5 to about 3.5 mol % HFP.Type: ApplicationFiled: July 12, 2001Publication date: January 16, 2003Inventors: Thomas J. Blong, Lisa P. Chen, Ralph Kaulbach, Friedrich Kloos, Georg Burkard
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Patent number: 6500537Abstract: A non-sticking composite material for office automation equipment which is produced by applying, to a substrate, a material comprising a fluorine-containing polymer having an excellent adhesive property to the substrate without necessitating complicated steps and is excellent in heat resistance, non-sticking property, stain-proofing property, water- and oil-repelling property, stain removing property, chemical resistance, rust-preventive property, antibacterial property, resistance to energy ray and abrasion resistance. The non-sticking composite material for office automation equipment is produced by applying, to the substrate, the material comprising a fluorine-containing ethylenic polymer having functional group which is prepared by copolymerizing (a) 0.05 to 30% by mole of at least one of fluorine-containing ethylenic monomers having at least one functional group selected from the group consisting of hydroxyl, carboxyl, a carboxylic salt group, a carboxylic ester group and epoxy, and (b) 70 to 99.Type: GrantFiled: January 21, 2000Date of Patent: December 31, 2002Assignee: Daikin Industries, Ltd.Inventors: Takayuki Araki, Yoshito Tanaka, Masahiro Kumegawa, Noritoshi Oka, Hisato Sanemasa, Tetsuo Shimizu
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Patent number: 6482882Abstract: Polymerization process of unsaturated pefluoromonomers, fluoro-containing monomers and optionally in the presence of hydrogen containing olefins, for obtaining polymers contaning hydrogen and fluorine, which utilizes a microemulsion comprising the following components: (a) water; (b) a fluoropolyoxyalkylene having hydrogen-containing end groups and/or hydrogen-containing repeating units; (c) a fluorine-free organic radicalic initiator for the polymerization of fluoro-containing monomers, soluble in component (B); (d) a fluoro-containing surfactant.Type: GrantFiled: May 24, 2000Date of Patent: November 19, 2002Assignee: Ausimont S.P.A.Inventors: Julio A. Abusleme, Alba Chittofrati
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Patent number: 6423798Abstract: Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.Type: GrantFiled: February 14, 2001Date of Patent: July 23, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert Clayton Wheland, Paul Douglas Brothers, Colin Anolick, Charles W. Stewart, Sr.
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Publication number: 20020091212Abstract: Use of surfactants in the suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, said surfacants having the general formula:Type: ApplicationFiled: November 8, 1999Publication date: July 11, 2002Inventors: JULIO A. ABUSLEME, PAOLO LAZZARI
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Patent number: 6399729Abstract: Chain transfer agents that are chlorine-free and liquid under polymerization conditions, useful for fluoromonomer polymerization, have the following formula: R1—O—R2. They are superior to common chain transfer agents such as chloroform in being safer and environmentally benign. They are also superior to gaseous chain transfer agents such as ethane because they do not enter the fluoromonomer gas recycle streams and so do not complicate the analysis and purification of those streams.Type: GrantFiled: November 29, 1999Date of Patent: June 4, 2002Assignee: E. I. du Pont de Nmeours and CompanyInventors: William Brown Farnham, Andrew Edward Feiring, Patrick Edward Lindner
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Patent number: 6388033Abstract: A process for preparing a fluoropolymer by the batchwise polymerization of a monomer mixture containing tetrafluoroethylene, in which, after the initiation of a reaction, the monomers are reacted under conditions such that the monomer mixture is supplemented to a polymerization system in an amount more than the amount of the monomers consumed and simultaneously the excessive unreacted monomers are discharged from the polymerization system to maintain the monomer composition in the polymerization system substantially the same as that of the composition of the monomer mixture initially charged, and the monomer mixture supplemented to the polymerization system contains a compound suppressing the autoexplosion of the monomers.Type: GrantFiled: February 28, 2001Date of Patent: May 14, 2002Assignee: Daikin Industries, Ltd.Inventors: Tomohisa Noda, Satoshi Komatsu
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Patent number: 6380337Abstract: A fluoroelastomer comprising constituent units derived from vinylidene fluoride (a) and constituent units derived from perfluoro(methoxypropyl vinyl ether) (b), optionally together with constituent units derived from tetrafluoroethylene (c) and/or constituent units derived from a perfluoroalkyl vinyl ether (d), wherein the constituent units (a) are contained in an amount of 65 to 85 mol %, the constituent units (b) in an amount of 0.5 to 30 mol %, the constituent units (c) in an amount of 0 to 10 mol % and the constituent units (d) in an amount of 0 to 25 mol %. The fluoroelastomer can be produced by a process comprising copolymerizing vinylidene fluoride and perfluoro(methoxypropyl vinyl ether), optionally together with tetrafluoroethylene and/or a perfluoroalkyl vinyl ether, in the presence of an iodated brominated compound represented by the general formula RBrnIm [I]. Further, there is provided a crosslinkable composition comprising the above fluoroelastomer and a peroxide crosslinking agent.Type: GrantFiled: December 20, 2000Date of Patent: April 30, 2002Assignee: Nippon Mektron, Ltd.Inventors: Katsumi Abe, Haruyoshi Tatsu
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Patent number: 6346587Abstract: The present invention relates to a process for the production of partially fluorinated fluoropolymers, in accordance with which fluoromonomers are free-radically polymerized in the presence of polyfluoropropanes or polyfluorobutanes of the formulae CF3—CH2—CF2H, CF3—CHF—CF2—H, CF3—CH2—CF3, CHF2—CF2—CH2F, CF3—CH2—CF2—CH3 AND CF3—CHF—CF2—CH3 and optionally a chain-transfer agent.Type: GrantFiled: September 18, 2000Date of Patent: February 12, 2002Assignee: Bayer AktiengesellschaftInventors: Ralf Krüger, Gerhard Heilig, Claus Dieter Sommerfeld
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Patent number: 6313236Abstract: 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 an olefin polymerization catalyst and at least one ether comprising at least one carbon-oxygen-carbon linkage (C—O—C) of the formula R1—O(—R2—O)m—R3 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: GrantFiled: August 31, 1999Date of Patent: November 6, 2001Assignee: Eastman Chemical CompanyInventors: Randal Ray Ford, Kenneth Alan Dooley, Jeffrey James Vanderbilt, Roxanna Lea Whitfield, Alan George Wonders
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Patent number: 6297334Abstract: Process for the preparation of tetrafluoroethylene (TFE) polymer-based dispersions having diameter average sizes in the range 0.005-0.06 &mgr;m, which comprises: a) preparation of an aqueous perfluoropolyether (PFPE) microemulsion; b) microemulsion feeding into the polymerization reactor, in such amounts so that the microemulsion perfluoropolyetheral oil phase is present in a concentration higher than 2 ml for liter of reaction medium; c) reaction medium feeding in the gaseous TFE polymerization reactor, optional addition of surfactants, stabilizers, comonomers, transfer agents; d) addition of the initiator, stabilizers, comonomers and transfer agents; e) discharge from the reactor of the polymeric latex.Type: GrantFiled: June 30, 1999Date of Patent: October 2, 2001Assignee: Ausimont S.p.A.Inventors: Enrico Marchese, Valery Kapeliouchko, Pasqua Colaianna
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Patent number: 6281312Abstract: Vinylidene fluoride and chlorotrifluoroethylene are copolymerized in the presence of a compound represented by the general formula I: InBrmR (I) wherein R represents a fluorohydrocarbon group, a chlorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n is 0, 1 or 2 and m is 0, 1 or 2 provided that n+m≧2. This provides a process for producing a fluorinated copolymer which enables providing a fluorinated copolymer crosslinking product having mechanical properties satisfactory for practical use as sealants even if no inorganic additive is added thereto.Type: GrantFiled: July 1, 1999Date of Patent: August 28, 2001Assignee: Nippon Mektron, Ltd.Inventors: Takashi Enokida, Okimasa Yamada
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Publication number: 20010012880Abstract: Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.Type: ApplicationFiled: February 14, 2001Publication date: August 9, 2001Inventors: Robert C. Wheland, Paul D. Brothers, Colin Anolick, Charles W. Stewart
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Patent number: 6268449Abstract: Disclosed is a process for preparing temperature-responsive polymers that may be formed into a thermally-processable form which exhibits flushability properties when immersed in water such that the temperature-responsive polymer may be used in a disposable absorbent product to impart flushability properties to the product. The process prepares the temperature-responsive polymer in an aqueous solution using a chain transfer agent such as isopropanol.Type: GrantFiled: December 20, 1996Date of Patent: July 31, 2001Assignee: Kimberly-Clark Worldwide, Inc.Inventors: Yihua Chang, Pavneet Singh Mumick
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Patent number: 6265507Abstract: Selected partially fluorinated olefins containing terminal unfluorinated vinyl groups, and optionally containing other functional groups, may be copolymerized with other olefins such as ethylene and/or propylene using metallocene or Ziegler-Natta type polymerization catalyst systems. The resulting polymers may be used as molding resins, elastomers, for films and in coatings.Type: GrantFiled: August 11, 1998Date of Patent: July 24, 2001Assignee: E. I. du Pont de Nemours and CompanyInventors: Lin Wang, Edward Bryan Coughlin, Zhen-Yu Yang
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Patent number: 6265499Abstract: A process for producing a shaped product, which comprises polymerizing a mixture comprising a radical scavenger, a polymerization initiator and a radical polymerizable monomer to obtain a partially polymerized mixture having the conversion of the monomer into the polymer of from 5 to 90 wt %, filling the partially polymerized mixture in a predetermined cavity and then applying polymerization energy to complete polymerization.Type: GrantFiled: November 27, 1998Date of Patent: July 24, 2001Assignee: Menicon Co., Ltd.Inventors: Haruko Nagino, Ichiro Ando
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Patent number: 6211314Abstract: The present invention therefore provides a vulcanizable mixture comprising a low-viscosity fluorinated rubbers, in which at least one fluorine monomer is polymerized by free radicals in the presence of one or more compounds of the formula (I) or (II) wherein R1 represents a fluorine atom or a perfluoroalkyl radical having 1 to 4 carbon atoms and R2 represents a perfluoroalkyl radical having 1 to 4 carbon atoms and n=4 or 5, and, optionally, a molecular weight regulator.Type: GrantFiled: June 4, 1999Date of Patent: April 3, 2001Assignee: Bayer AktiengesellschaftInventors: Ralf Krüger, Wilhelm-Franz Biener
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Patent number: 6201084Abstract: Vinylidenfluoride (VDF) thermoplastic copolymers, consisting of (a) from 0.1 to 10% by moles, preferably from 0.5 to 5%, of one or more fluorodioxoles of formula: wherein Y is equal to ORf wherein Rf is a perfluoroalkyl having from 1 to 5 carbon atoms, or Y═Z as defined hereinunder; Y is preferably equal to ORf; X1 and X2, equal to or different from each other, are —F or —CF3; Z is selected from —F, —H, —Cl; (b) VDF, being the remaining part to 100% by moles.Type: GrantFiled: June 30, 1997Date of Patent: March 13, 2001Assignee: Ausimont S.p.A.Inventors: Julio A. Abusleme, Giulio Brinati
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Patent number: 6191242Abstract: Unsheared, water-soluble, branched, high molecular weight, anionic, polymeric flocculants are produced by polymerizing ethylenically unsaturated anionic, and optionally non-ionic, monomers and a branching agent in the presence of a chain-transfer agent. They are useful as flocculating agents for releasing water from dispersions of suspended solids.Type: GrantFiled: November 27, 1996Date of Patent: February 20, 2001Assignee: Cytec Technology Corp.Inventors: Roderick Glyn Ryles, Roger Edgar Neff, Joseph Jacinto Pellon
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Patent number: 6177533Abstract: Stretchable polytetrafluoroethylene resin has high break strength and/or low creep rate.Type: GrantFiled: September 29, 1999Date of Patent: January 23, 2001Assignee: E. I. du Pont de Nemours and CompanyInventor: Jones Clay Woodward
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Patent number: 6166157Abstract: Iodoperfluoroalkylnitriles are useful as chain transfer agents in the free radical polymerization of vinyl monomers to form perfluoropolymers. These nitrites provide end groups, which may take part in a cross-linking reaction, if desired, and also have a relatively low toxicity. The resulting perfluoropolymers are useful as molding resins and elastomers, particularly for parts where good chemical resistance and/or high temperature resistance are desirable.Type: GrantFiled: June 10, 1998Date of Patent: December 26, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: Ming-Hong Hung, Anestis Leonidas Logothetis, Zhen-Yu Yang
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Patent number: 6150485Abstract: Fluorine-containing elastomers produced through copolymerization reaction of vinylidene fluoride, tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and chlorotrifluoroethylene in the presence of a bromine-containing monomer compound and an iodine- and bromine-containing compound, where hexafluoropropene can be further copolymerized, have not only a distinguished resistance to amine-based additives and also distinguished low-temperature characteristic and engine oil resistance, and also a lower cost attained by reduced copolymer proportion of perfluoro(lower alkyl vinyl ether).Type: GrantFiled: February 11, 1999Date of Patent: November 21, 2000Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Haruyoshi Tatsu
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Patent number: 6140437Abstract: A fluorine-containing elastomeric copolymer comprising 55 to 62 mole % of repeating units derived from tetrafluoroethylene and 38 to 45 mole % of repeating units derived from perfluoro(methyl vinyl ether) which is obtained by radically polymerizing the monomers in the presence of a diiodide compound of the formula: RI.sub.2 in which R is a saturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, or a hydrocarbon group having 1 to 3 carbon atoms and which has a Mooney viscosity (ML.sub.1+10 100.degree. C.) in the range between 20 and 150. This copolymer has an excellent compression set at high temperature, which is an important property for sealing members.Type: GrantFiled: June 24, 1998Date of Patent: October 31, 2000Assignee: Daikin Industries Ltd.Inventors: Masanori Kitaichi, Hideya Saito, Yasuji Iwasaki, Mitsuru Kishine
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Patent number: 6133389Abstract: Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.Type: GrantFiled: June 6, 1997Date of Patent: October 17, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: Colin Anolick, Viacheslav Alexandrovich Petrov, Bruce Edmund Smart, Charles Winfield Stewart, Robert Clayton Wheland, William Brown Farnham, Andrew Edward Feiring, Weiming Qiu
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Patent number: 6121392Abstract: The specification discloses a method for producing low softening point beta-pinene based polyterpene resins having an essentially unimodal molecular weight distribution, as well as resins made by the method. In the process a beta-pinene monomer is reacted with an olefinic co-monomer in the presence of a Lewis acid catalyst and a co-catalyst under reaction conditions sufficient to produce a beta-pinene-based copolymer having a softening point in the range of from about 85.degree. to about 125.degree. C., an essentially unimodal molecular weight distribution, and a bound chlorine level of less than about 400 ppm. Because of their low softening points and essentially unimodal molecular weight distributions, the beta-pinene-based resins of the invention are expected to exhibit improved compatibility with block copolymers used in modern adhesive formulations.Type: GrantFiled: May 8, 1997Date of Patent: September 19, 2000Assignee: Arizona Chemical CompanyInventor: Kerry L. Thompson
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Patent number: 6107423Abstract: Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.Type: GrantFiled: October 14, 1998Date of Patent: August 22, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert Clayton Wheland, Paul Douglas Brothers
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Patent number: 6040405Abstract: Disclosed herein are copolymers of tetrafluoroethylene and n-alkyl trifluorovinyl ether which further contain either curesite repeat units and/or iodine. Such curesite repeat units, upon exposure to free radicals, may crosslink the copolymers. The iodine is introduced by carrying out free radical polymerization in the presence of an organic iodide chain transfer agent. The polymers according to the invention are especially useful as elastomers and/or as molding resins for articles or parts that may be exposed to a basic environment. The preparation of such polymers by aqueous emulsion polymerization is also disclosed.Type: GrantFiled: October 23, 1998Date of Patent: March 21, 2000Assignee: E. I. du Pont de Nemours and CompanyInventor: Paul Gregory Bekiarian
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Patent number: 6013747Abstract: Use of surfactants in the suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, said surfacants having the general formula:R.sub.f --[L--(OCHR.sub.1 --CHR.sub.2).sub.m --OZ)].sub.iwherein:i is equal to 1 or 2;m is an integer comprised between 4 and 60;L can be chosen between: --(CFY--CO--O).sub.p R'-- and --(CFY--CO--NH).sub.p R'--wherein p is an integer equal to 0 or to 1;Y=F, CF.sub.3 ; R'=alkylic radical C.sub.1 -C.sub.5, linear or branched when possible;R.sub.1, R.sub.2 can be both H or the former H and the latter CH.sub.3 ;Z can be H, alkyl radical C.sub.1 -C.sub.3, linear or branched when possible; or (CH.sub.2).sub.n OH with n an integer from 1 to 6;R.sub.f is a perfluoroalkylic radical or a perfluoropolyether radical, having a number average molecular weight comprised between 250 and 1500.Type: GrantFiled: July 7, 1997Date of Patent: January 11, 2000Assignee: Ausimont, S.p.A.Inventors: Julio A. Abusleme, Paolo Lazzari
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Patent number: 6011129Abstract: Fluorine-containing elastomers produced through copolymerization reaction of vinylidene fluoride, tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and chlorotrifluoroethylene in the presence of a bromine-containing monomer compound and an iodine- and bromine-containing compound, where hexafluoropropene can be further copolymerized, have not only a distinguished resistance to amine-based additives and also distinguished low-temperature characteristic and engine oil resistance, and also a lower cost attained by reduced copolymer proportion of perfluoro(lower alkyl vinyl ether).Type: GrantFiled: July 10, 1998Date of Patent: January 4, 2000Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Haruyoshi Tatsu
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Patent number: 5998555Abstract: A process for the preparation of polymers having low molecular weight of the order of 10.sup.4 and with a low polydispersity index in the range of 1.2-1.7, said process comprising reacting an electron donor and an electron acceptor in a solvent medium at a temperature below the boiling point of the mixture under inert atmosphere, to form a complex which dissociates to release a free radical and a cation radical; preparing a solution of the desired monomer or monomers) and the free radical quencher in the same solvent used in step (i), under the same temperature; and adding the reaction mixture obtained in step (ii) to the mixture obtained in step (i) to form the polymer.Type: GrantFiled: November 17, 1995Date of Patent: December 7, 1999Assignee: Council of Scientific & Industrial ResearchInventors: Ranganathan Vijayaraghavan, Sripada Panduranga Rao, Mahadevan Surianarayanan, Kondapuram Vijayaraghavan
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Patent number: 5962610Abstract: Ethylene fluoro-containing copolymers of the ECTFE and ETFE type, optionally in the presence of a third comonomer in amount comprised between 0.1 and 10% by moles, having a viscosity between 10.sup.2 and 10.sup.5 Pa.sec with shear rates of 1 sec.sup.-1 measured at the temperature of about 30.degree. C. higher than the second melting temperature, and having a rheologic curve in the diagram shear viscosity/shear-rate with a slope higher than 200, calculated as ratio between the viscosity in Pa.sec and the shear-rate in sec.sup.-1 in the shear-rate range comprised between 1 and 10 sec.sup.-1, and having a processability zone with shear-rate values higher than 10 s.sup.-1.Type: GrantFiled: July 3, 1997Date of Patent: October 5, 1999Assignee: Ausimont S.p.A.Inventors: Julio A. Abusleme, Vincenzo Arcella, Giambattista Besana
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Patent number: 5925721Abstract: In a process for producing a vinylidene fluoride resin by polymerizing vinylidene fluoride or a mixture of vinylidene fluoride and a vinyl monomer copolymerizable with vinylidene fluoride, a portion of an iodide compound represented by the formula: X-R.sub.f -X wherein R.sub.f is a divalent organic group containing at least two divalent fluoroalkyl ether groups: and X's are independently an iodine atom or a fluorine atom, provided that at least one of the X's is an iodine atom; is added to start the polymerization, and the remainder of the iodide compound is further added dividedly at least twice in the course of the polymerization. This process enables to obtain a vinylidene fluoride resin having a viscosity-average molecular weight of 150,000 or more and also having a superior water repellency. This resin has good mechanical strength and release properties and also can be well processed into films.Type: GrantFiled: February 18, 1998Date of Patent: July 20, 1999Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Ryuichi Saito, Tadashi Amano
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Patent number: 5910552Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by the following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.Type: GrantFiled: March 14, 1997Date of Patent: June 8, 1999Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Haruyoshi Tatsu
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Patent number: 5902868Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.Type: GrantFiled: October 22, 1997Date of Patent: May 11, 1999Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Haruyoshi Tatsu
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Patent number: 5898054Abstract: A peroxide-vulcanizable fluorine-containing elastomer containing iodines as cross-linking sites, capable of producing vulcanization products having a distinguished heat resistance is produced by polymerization reaction of a fluorinated olefin having 2 to 8 carbon atoms in the presence of a diiodide compound represented by the following general formula:I--R--where R is a divalent fluorohydrocarbon group, chlorofluorohydrocarbon group or hydrocarbon group, having 2 to 8 carbon atoms, respectively, and 2,2-difluoroiodoethylene.Type: GrantFiled: November 28, 1997Date of Patent: April 27, 1999Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Kuniyoshi Kawasaki, Haruyoshi Tatsu
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Patent number: 5891974Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by the following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.Type: GrantFiled: October 22, 1997Date of Patent: April 6, 1999Assignee: Nippon Mektron, LimitedInventors: Satoru Saito, Haruyoshi Tatsu
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Patent number: 5880240Abstract: An alkyl-containing porous resin with a specific surface area of 50 to 600 m.sup.2 /g, the resin being prepared by polymerizing a monomer mixture of, based on the total weight of the monomers, 15 to 97% by weight of divinylbenzene, 0 to 82% by weight of at least one aromatic monovinyl monomer selected from the group consisting of styrene, methylstyrene and ethylvinylbenzene and 3 to 50% by weight of a vinylbenzyloxyalkane derivative represented by the formula ##STR1## wherein n is an integer of 1 to 18, a process for its preparation and its use.The porous resin of the invention is capable of fully exhibit its modified functions based on the variations of chemical and structural environments on the surface of resin, the functions being modified by introducing alkyl groups having varying chain lengths.Type: GrantFiled: November 26, 1997Date of Patent: March 9, 1999Assignee: Arakawa Chemical Industries, Ltd.Inventor: Takaharu Tsuno
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Patent number: 5859144Abstract: A rubber compound comprising a fluorine rubber component and an acrylic rubber component is produced by adding an acrylic monomer to an aqueous emulsion of fluorine-containing elastomer obtained by emulsion polymerization, using a fluorine-containing surfactant, followed by radical polymerization reaction. The obtained rubber compound can satify both of vulcanization moldability and heat aging resistance, and is at a lower cost than the expensive fluorine rubber.Type: GrantFiled: September 12, 1996Date of Patent: January 12, 1999Assignee: Nippon Mektron, LimitedInventors: Kuniyoshi Saito, Iwao Moriyama, Jun Okabe
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Patent number: 5852149Abstract: Fluoroelastomers substantially free from polar end groups, comprising vinylidene fluoride (VDF) and/or tetrafluoroethylene (TFE) and at least another fluorinated ethylenically unsaturated monomer. They are characterized by an high thermal stability, an optimal processability and curing easiness, without giving rise to pre-crosslinking phenomena and moreover they do not require prolonged post-curing treatments. Such flurooelastomers are advantageously prepared by copolymerization of the corresponding monomers in aqueous emulsion in the presence of ultraviolet-visible radiation (UV-VIS) and of an organic peroxide.Type: GrantFiled: August 4, 1997Date of Patent: December 22, 1998Assignee: Ausimont S.p.A.Inventors: Julio A. Abusleme, Margherita Albano
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Patent number: 5852150Abstract: Disclosed herein are copolymers of tetrafluoroethylene and n-alkyl trifluorovinyl ether which further contain either curesite repeat units and/or iodine. Such curesite repeat units, upon exposure to free radicals, may crosslink the copolymers. The iodine is introduced by carrying out free radical polymerization in the presence of an organic iodide chain transfer agent. The polymers according to the invention are especially useful as elastomers and/or as molding resins for articles or parts that may be exposed to a basic environment. The preparation of such polymers by aqueous emulsion polymerization is also disclosed.Type: GrantFiled: December 3, 1997Date of Patent: December 22, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Paul Gregory Bekiarian
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Patent number: 5824755Abstract: Fluoroelastomers having copolymerized units of vinylidene fluoride and at least one other fluorinated monomer are prepared in aqueous suspension using an initiator comprising a solution of an oil soluble peroxide in a water-soluble hydrocarbon solvent.Type: GrantFiled: February 21, 1997Date of Patent: October 20, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Kenichi Hayashi, Kenzo Hashimura, Michio Kasahara, Yukihiro Ikeda
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Patent number: 5824372Abstract: A copolymer having units of Formula II: ##STR1## wherein M is H, alkali metal, anmonium cation, or a mixture thereof;N is OM or a mixture of OM, OR, and NR.sub.1 R.sub.2 in a molar ratio of (OM):(OR):(NR.sub.1 R.sub.2) of ?1-(e+f)!:e:f, wherein e and f are each independently 0 to 0.5, provided that (e+f) is less than 0.8;R, R.sub.1, and R.sub.2 are each independently H or a branched or straight chain C.sub.1-20 alkyl;Y is a C.sub.2-10 alkyl, C.sub.6-12 aryl, or C.sub.4-12 alkoxy;X is a fluorinated thiol radical;Z is H; andv and w are each a positive number such that the molar ratio of v to w is from about 0.4:1 to about 1.3:1 is disclosed.Type: GrantFiled: September 25, 1997Date of Patent: October 20, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Engelbert Pechhold
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Patent number: 5789504Abstract: A process for preparing low molecular weight polytetrafluoroethylene having a melting point of 250.degree. C. to 325.degree. C. comprising polymerizing tetrafluoroethylene in at least one polymerization solvent selected from the group consisting of hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons which have boiling points in the range between -10.degree. C. and 70.degree. C. under constant pressure by the supplement of tetrafluoroethylene. According to this process, the low molecular weight polytetrafluoroethylene which is useful as an additive to various materials is produced in the solvent which has a low ozone destruction factor or does not destroy the ozone, under economically advantageous low pressure which can be controlled safely.Type: GrantFiled: March 22, 1996Date of Patent: August 4, 1998Assignee: Daikin Industries, Ltd.Inventors: Kiyohiko Ihara, Kazuhiro Nakai, Yoshiki Maruya
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Patent number: 5780565Abstract: A polymerization process produces polymers that are insoluble in a reaction mixture that was homogeneous before the polymer began to form. A dispersing agent in the polymerizing system (i.e., the reaction mixture plus the dispersing agent) allows a kinetically stable dispersion of the polymer to be formed in this polymerizing system. The polymerization process is performed in a fluid held under superatmospheric conditions such that the fluid is a liquid or a supercritical fluid; the fluid being carbon dioxide, a hydroflurocarbon, a perfluorocarbon, or a mixture of any of the foregoing.Type: GrantFiled: November 28, 1995Date of Patent: July 14, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert S. Clough, Cheryl L. Senger, John E. Gozum
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Patent number: 5767210Abstract: This process is characterized by the fact that at least one of the said monomers is polymerized or copolymerized in bulk, solution, emulsion or suspension, at a temperature that can be as low as 0.degree. C., in the presence of an initiation system including: at least one compound generating radicals, other than bromofluorene, and at least one catalyst consisting of a complex of palladium in the 0 oxidation state, denoted by the following formula (I): Pd(0)L.sup.1 L.sup.2 L.sup.3 L.sup.4 in which each of L.sup.1, L.sup.2, L.sup.3 and L.sup.4, which are identical or different, denotes a ligand which may be a chiral ligand, which is chosen from PRR'R", P(OR)(OR')(OR"), NRR'R", ORR', SRR', SeRR', AsRR'R", SbRR'R", where each of R, R' and R" independently denotes a C.sub.1 -C.sub.14 alkyl group, optionally substituted, or an optionally substituted aromatic group, it being possible for at least two of these ligands to be joined to one another by one or more divalent radicals.Type: GrantFiled: March 27, 1997Date of Patent: June 16, 1998Assignee: Elf Atochem, S.A.Inventors: Philippe Lecomte, Philippe Dubois, Robert Jerome, Philippe Teyssie, Thierry Senninger
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Patent number: 5731394Abstract: Polytetrafluoroethylene (PTFE) fine powder is provided which exhibits both low rheometer extrusion pressure and high adhesion to wire by incorporating into the free powder the combination of perfluoro(alkyl) ethylene such as perfluoro(n-butyl) ethylene with fluoro(alkyl vinyl ether), such as perfluoro(propyl vinyl ether), or fluoroolefin such as hexafluoropropylene as modifiers of the PTFE fine powder. The modified PTFE fine powder is made by aqueous dispersion copolymerization of TFE with the modifying monomers, with the addition of molecular weight reducing agent towards the end of the polymerization reaction.Type: GrantFiled: March 27, 1997Date of Patent: March 24, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Theodore Arthur Treat, Satish Chandra Malhotra
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Patent number: 5731395Abstract: A functional group-containing porous resin prepared by polymerization of a monomer mixture of, based on 100% by weight of the total amount of the monomers, 15 to 97% by weight of divinylbenzene, 0 to 82% by weight of at least one aromatic monovinyl monomer selected from the group consisting of styrene, methylstyrene and ethylvinylbenzene and 3 to 30% by weight of a vinylbenzyloxyalkyl derivative represented by the formula ##STR1## wherein n is an integer of 2 to 16 and A represents a hydroxyl group or a halogen atom, and a process for preparing the same. The above-mentioned porous resin of the invention can fully exhibit its function due to the marked presence of a functional group on the surface of the resin and/or in the neighborhood thereof.Type: GrantFiled: November 13, 1996Date of Patent: March 24, 1998Assignee: Arakawa Chemical Industries, Ltd.Inventor: Takaharu Tsuno
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Patent number: 5728786Abstract: Styryl-modified acrylate polymer pressure sensitive adhesive beads, adhesive films made therefrom and methods of making the same. Surprisingly, the polymerization of styryl-functional monomer into bead formulations provides beads that can be easily extruded and made into adhesive films having high shear strength. The polymerization of styryl-functional monomer into bead formulations comprising methacrylic acid also obviates the need to use a modifier moiety.Type: GrantFiled: July 15, 1996Date of Patent: March 17, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Chung I. Young, Albert I. Everaerts, Stephen E. Krampe
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Patent number: 5712348Abstract: A copolymer having units of Formula II: ##STR1## wherein M is H, alkali metal, ammonium cation, or a mixture thereof;N is OM or a mixture of OM, OR, and NR.sub.1 R.sub.2 in a molar ratio of (OM):(OR):(NR.sub.1 R.sub.2) of ?1-(e+f)!:e:f, wherein e and f are each independently 0 to 0.5, provided that (e+f) is less than 0.8;R, R.sub.1, and R.sub.2 are each independently H or a branched or straight chain C.sub.1-20 alkyl;Y is a C.sub.2-10 alkyl, C.sub.6-12 aryl, or C.sub.4-12 alkoxy;X is a fluorinated thiol radical;Z is H; andv and w are each a positive number such that the molar ratio of v to w is from about 0.4:1 to about 1.3:1 is disclosed.Type: GrantFiled: March 13, 1996Date of Patent: January 27, 1998Assignee: E. I. Du Pont de Nemours and CompanyInventor: Engelbert Pechhold