DE3006920C2 - - Google Patents

Info

Publication number
DE3006920C2
DE3006920C2 DE3006920A DE3006920A DE3006920C2 DE 3006920 C2 DE3006920 C2 DE 3006920C2 DE 3006920 A DE3006920 A DE 3006920A DE 3006920 A DE3006920 A DE 3006920A DE 3006920 C2 DE3006920 C2 DE 3006920C2
Authority
DE
Germany
Prior art keywords
aromatic
carbon atoms
polymers
radicals
hardener
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE3006920A
Other languages
German (de)
English (en)
Other versions
DE3006920A1 (de
Inventor
Allan T. Saint Paul Minn. Us Worm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dyneon LLC
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of DE3006920A1 publication Critical patent/DE3006920A1/de
Application granted granted Critical
Publication of DE3006920C2 publication Critical patent/DE3006920C2/de
Granted legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/36Sulfur-, selenium-, or tellurium-containing compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
DE19803006920 1979-02-26 1980-02-25 Haertbare formmasse Granted DE3006920A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/015,171 US4233421A (en) 1979-02-26 1979-02-26 Fluoroelastomer composition containing sulfonium curing agents

Publications (2)

Publication Number Publication Date
DE3006920A1 DE3006920A1 (de) 1980-09-04
DE3006920C2 true DE3006920C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1992-10-15

Family

ID=21769900

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803006920 Granted DE3006920A1 (de) 1979-02-26 1980-02-25 Haertbare formmasse

Country Status (6)

Country Link
US (1) US4233421A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS55116748A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3006920A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2449707A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB2044270B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1128097B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (119)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339567A (en) * 1980-03-07 1982-07-13 Ciba-Geigy Corporation Photopolymerization by means of sulphoxonium salts
US4383025A (en) * 1980-07-10 1983-05-10 Ciba-Geigy Corporation Photopolymerization by means of sulfoxonium salts
US4398014A (en) * 1980-11-04 1983-08-09 Ciba-Geigy Corporation Sulfoxonium salts and their use as polymerization catalysts
US4446270A (en) * 1982-11-22 1984-05-01 Minnesota Mining And Manufacturing Company Vulcanizing fluorocarbon elastomers with one or a mixture of aromatic compounds having hydroxyl and oxyallyl groups
US4797456A (en) * 1982-12-09 1989-01-10 The Dow Chemical Company Aqueous-dispersible cyclic sulfonium compounds that cure to form water-insoluble polymers
US4885355A (en) * 1982-12-09 1989-12-05 The Dow Chemical Company Water-insoluble polymers from cyclic sulfonium compounds
US4595720A (en) * 1983-10-03 1986-06-17 Minnesota Mining And Manufacturing Company Processing elastomers
US5216085A (en) * 1984-02-27 1993-06-01 Minnesota Mining And Manufacturing Company Method for curing fluoroelastomer compositions containing fluoroaliphatic sulfonamides as curing agents
US5086123A (en) * 1984-02-27 1992-02-04 Minnesota Mining And Manufacturing Company Fluoroelastomer compositions containing fluoroaliphatic sulfonamides as curing agents
ES8605551A1 (es) * 1984-02-27 1986-03-16 Minnesota Mining & Mfg Un metodo para preparar un articulo conformado a partir de conposiciones fluoroelastomeras que contienen sulfonamidas fluoroalifaticas en calidad de agentes de curado.
US4550132A (en) * 1984-03-19 1985-10-29 E. I. Du Pont De Nemours And Company Peroxide-curable bromine-containing fluoroelastomers containing a sulfone
US4956419A (en) * 1988-03-09 1990-09-11 Minnesota Mining And Manufacturing Company Fluorine-containing polymers with pendent thioorgano groups and method of making said polymers
US4882390A (en) * 1988-04-01 1989-11-21 Minnesota Mining And Manufacturing Company Fluoroelastomer composition with organo-onium compounds
US4912171A (en) * 1988-04-01 1990-03-27 Minnesota Mining And Manufacturing Company Fluoroelastomer curing process with phosphonium compound
US5284611A (en) * 1989-06-22 1994-02-08 Minnesota Mining And Manufacturing Company Fluoroelastomer composition with improved bonding properties
US5478652A (en) * 1989-06-22 1995-12-26 Minnesota Mining And Manufacturing Company Fluoroelastomer composition with improved bonding properties
US5371143A (en) * 1989-11-16 1994-12-06 Minnesota Mining And Manufacturing Company Polymer blend composition of fluorinated elastomers, thermoplastic polymers and thermoplastics elastomers
CA2043971A1 (en) * 1990-07-13 1992-01-14 Jeffrey D. Weigelt Curing fluorocarbon elastomers
US5266650A (en) * 1990-10-11 1993-11-30 Minnesota Mining And Manufacturing Company Curing fluorocarbon elastomers
US5384374A (en) * 1991-01-11 1995-01-24 Minnesota Mining And Manufacturing Company Curing fluorocarbon elastomers
US5208305A (en) * 1992-04-17 1993-05-04 Minnesota Mining And Manufacturing Company Fluorine-containing polymers and preparation and use thereof
IT1255633B (it) * 1992-05-22 1995-11-09 Ausimont Spa Copolimeri fluoroelastomerici e fluoroplastomerici dotati di elevata resistenza alle basi
US5262490A (en) * 1992-08-24 1993-11-16 Minnesota Mining And Manufacturing Company Fluoroelastomer composition with organo-onium compounds
IT1255853B (it) * 1992-10-12 1995-11-17 Ausimont Spa Composizioni di polimeri elastomerici vulcanizzabili per via ionica
US5285002A (en) * 1993-03-23 1994-02-08 Minnesota Mining And Manufacturing Company Fluorine-containing polymers and preparation and use thereof
US5623038A (en) * 1994-12-14 1997-04-22 Minnesota Mining And Manufacturing Company Fluorine-containing polymers and preparation thereof
CN1082975C (zh) * 1995-06-22 2002-04-17 戴尼昂有限公司 有改进的防焦性的可固化含氟弹性体组合物
US5654374A (en) * 1995-08-28 1997-08-05 Minnesota Mining And Manufacturing Company Curable compositions containing silyl-functional onium cure accelerators and method of curing using same
US5734085A (en) * 1995-12-21 1998-03-31 Minnesota Mining And Manufacturing Company Fluorinated phosphonium salts
US5591804A (en) * 1995-12-21 1997-01-07 Minnesota Mining And Manufacturing Company Fluorinated onium salts, curable compositions containing same, and method of curing using same
US5654375A (en) * 1996-05-24 1997-08-05 Minnesota Mining And Manufacturing Company Fluoroelastomer compositions containing organo-onium compounds
US5681881A (en) * 1996-05-24 1997-10-28 Minnesota Mining And Manufacturing Company Fluoroelastomer compositions
US5891965A (en) * 1997-01-06 1999-04-06 Dyneon Llc Low temperature perfluoroether-containing fluoroelastomers
US5728773A (en) * 1997-02-21 1998-03-17 Minnesota Mining And Manufacturing Company Fluoroelastomer composition with organo-onium and blocked-carbonate compounds
US6087406A (en) * 1997-03-12 2000-07-11 Dyneon Llc Recycle of vulcanized fluorinated elastomers
IT1292361B1 (it) 1997-05-20 1999-01-29 Ausimont Spa Composizioni fluoroelastomeriche volcanizzabili
US6197393B1 (en) 1997-06-27 2001-03-06 3M Innovative Properties Company Multi-layer compositions comprising a fluoropolymer
US6117508A (en) * 1997-06-27 2000-09-12 Dyneon Llc Composite articles including a fluoropolymer blend
US6239223B1 (en) 1997-09-05 2001-05-29 Chemfab Corporation Fluoropolymeric composition
US6270901B1 (en) 1997-12-19 2001-08-07 Dyneon Llc Compositions for bonding fluoroplastics
US6482522B1 (en) 1997-12-19 2002-11-19 Dyneon Llc Elastomer compositions for bonding to fluoropolymers
US6096428A (en) * 1998-04-09 2000-08-01 3M Innovative Properties Company Multi-layer compositions comprising a fluoropolymer
US6156400A (en) * 1998-04-09 2000-12-05 3M Innovative Properties Company Multi-layer compositions comprising a fluoropolymer
BR9912619A (pt) 1998-07-30 2001-04-24 Dyneon Llc Artigo compósito, e, processo para aderir um polìmero substancialmente não fluorado a um fluoropolìmero
JP2002524305A (ja) 1998-09-08 2002-08-06 ダイネオン エルエルシー 多層複合材料
DE60007850T2 (de) 1999-03-02 2004-11-04 3M Innovative Properties Co., St. Paul Zusammensetzungen zum verbinden von fluorpolymeren mit nicht-fluorierten polymeren
AU5906800A (en) 1999-07-02 2001-01-22 Dyneon Llc Fluoroelastomer compositions and articles made therefrom
US6359166B1 (en) 1999-10-08 2002-03-19 3M Innovative Properties Company Oxalate ester blocked phenols
US6767948B1 (en) * 1999-12-22 2004-07-27 3M Innovative Properties Company Polyolefin polymer and catalyst blend for bonding fluoropolymers
US6593416B2 (en) 2000-02-01 2003-07-15 3M Innovative Properties Company Fluoropolymers
US6720360B1 (en) 2000-02-01 2004-04-13 3M Innovative Properties Company Ultra-clean fluoropolymers
US6310141B1 (en) 2000-06-27 2001-10-30 Dyneon Llc Fluoropolymer-containing compositions
US6489420B1 (en) 2000-06-27 2002-12-03 Dyneon Llc Fluoropolymers with improved characteristics
EP1167441B1 (en) * 2000-06-29 2015-07-29 3M Innovative Properties Company Fluoroelastomer composition comprising a mineral oil
AU2002303564A1 (en) 2001-05-02 2002-11-11 3M Innovative Properties Company Aqueous emulsion polymerization in the presence of ethers as chain transfer agents to produce fluoropolymers
CN1223619C (zh) 2001-05-02 2005-10-19 3M创新有限公司 制备氟聚合物的无乳化剂水乳液聚合方法
US6630047B2 (en) * 2001-05-21 2003-10-07 3M Innovative Properties Company Fluoropolymer bonding composition and method
US20050208308A1 (en) * 2001-05-21 2005-09-22 3M Innovative Properties Company Bonding compositions
US6753087B2 (en) * 2001-05-21 2004-06-22 3M Innovative Properties Company Fluoropolymer bonding
US7485371B2 (en) * 2004-04-16 2009-02-03 3M Innovative Properties Company Bonding compositions
US6685793B2 (en) 2001-05-21 2004-02-03 3M Innovative Properties Company Fluoropolymer bonding composition and method
WO2003037621A2 (en) * 2001-10-31 2003-05-08 3M Innovative Properties Company Bonding of a fluoropolymer layer to a substrate
US6916871B2 (en) * 2001-10-31 2005-07-12 3M Innovative Properties Company Composition and method for making a fluoroelastomer
US6844030B2 (en) 2001-12-14 2005-01-18 3M Innovative Properties Company Process for modifying a polymeric surface
US6752894B2 (en) 2001-12-14 2004-06-22 3M Innovative Properties Company Process for modifying a polymeric surface
ITMI20020598A1 (it) 2002-03-22 2003-09-22 Ausimont Spa Fluoroelastomeri vulcanizzabili
CN1662566B (zh) * 2002-06-21 2010-06-16 3M创新有限公司 极性端基量减少的含氟聚合物的制备方法
US6884860B1 (en) 2002-07-29 2005-04-26 3M Innovative Properties Company Fluoroelastomer copolymer based on tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene and vinylidene fluoride
JP2006504844A (ja) * 2002-10-31 2006-02-09 スリーエム イノベイティブ プロパティズ カンパニー フッ化オレフィンと炭化水素オレフィンとのコポリマーを製造するための、乳化剤非含有水性乳化重合
AU2003293187A1 (en) * 2002-12-23 2004-07-29 3M Innovative Properties Company Fluoroplastic polymers having nitrogen-containing cure sites
US20040126708A1 (en) * 2002-12-31 2004-07-01 3M Innovative Properties Company Method for modifying the surface of a polymeric substrate
DE60303481T2 (de) * 2003-03-04 2006-09-07 3M Innovative Properties Co., St. Paul Verfahren zur Verbindung von einer Fluoroelastomerschicht mit einer Silikonelastomerschicht, Laminat und Artikel davon
BRPI0411119B1 (pt) * 2003-06-09 2014-12-02 3M Innovative Properties Co “composição polimérica processável em fusão compreendendo polímero processável em fusão nãofluorado e fluoropolímero e método de produzir uma composição polimérica processável em fusão”
US6986947B2 (en) * 2003-10-09 2006-01-17 3M Innovative Properties Company Method of modifying a fluoropolymer and articles thereby
US7273531B2 (en) * 2003-11-05 2007-09-25 3M Innovative Properties Company Method of modifying a fluoropolymeric substrate and composite articles thereby
ATE529451T1 (de) * 2003-11-17 2011-11-15 3M Innovative Properties Co Wässrige ptfe-dispersionen mit einem niedrigen gehalt an fluorierten emulgatoren
US7135122B2 (en) * 2004-03-31 2006-11-14 Freudenberg-Nok General Partnership Polytetrafluoroethylene composites
ITMI20040830A1 (it) * 2004-04-27 2004-07-27 Solvay Solexis Spa Fluoroelastomeri vulcanizzabili
US20060000801A1 (en) * 2004-06-30 2006-01-05 Park Edward H Surface bonding in halogenated polymeric components
US7452577B2 (en) * 2004-06-30 2008-11-18 Freudenberg-Nok General Partnership Electron beam curing of fabricated polymeric structures
US7521508B2 (en) * 2004-06-30 2009-04-21 Freudenberg-Nok General Partnership Electron beam inter-curing of plastic and elastomer blends
US7244329B2 (en) * 2004-06-30 2007-07-17 Freudenberg-Nok General Partnership Electron beam curing in a composite having a flow resistant adhesive layer
US7230038B2 (en) * 2004-06-30 2007-06-12 Freudenberg-Nok General Partnership Branched chain fluoropolymers
US7342072B2 (en) 2004-06-30 2008-03-11 Freudenberg-Nok General Partnership Bimodal compounds having an elastomeric moiety
ATE413418T1 (de) * 2004-09-09 2008-11-15 3M Innovative Properties Co Fluoropolymer zur herstellung von einem fluoroelastomer
US20060100368A1 (en) * 2004-11-08 2006-05-11 Park Edward H Elastomer gum polymer systems
US20060099368A1 (en) * 2004-11-08 2006-05-11 Park Edward H Fuel hose with a fluoropolymer inner layer
US7381765B2 (en) 2004-11-08 2008-06-03 Freudenberg-Nok General Partnership Electrostatically dissipative fluoropolymers
EP1760121B1 (en) * 2005-08-31 2009-10-07 FUJIFILM Corporation Radiation curable ink comprising a condensed polycyclic aromatic photosensitizer
US20070048476A1 (en) * 2005-08-31 2007-03-01 Freudenberg-Nok General Partnership Assemblies sealed with multilayer composite compression seals having a layer of dispersed fluoroelastomer in thermoplastic
US20070044906A1 (en) * 2005-08-31 2007-03-01 Freudenberg-Nok General Partnership Multilayer polymeric composites having a layer of dispersed fluoroelastomer in thermoplastic
US20070045967A1 (en) * 2005-08-31 2007-03-01 Freudenberg-Nok General Partnership Assemblies sealed with multilayer composite torsion seals having a layer of dispersed fluoroelastomer in thermoplastic
US7863365B2 (en) 2006-12-20 2011-01-04 Freudenberg-Nok General Partnership Robust magnetizable elastomeric thermoplastic blends
US7608216B2 (en) * 2006-12-27 2009-10-27 Freudenberg-Nok General Partnership Methods for preparing articles from processable and dimensionally stable elastomer compositions
KR101530105B1 (ko) * 2007-09-14 2015-06-18 쓰리엠 이노베이티브 프로퍼티즈 캄파니 초저점도 요오드 함유 무정형 플루오로중합체
US20120088884A1 (en) 2009-06-19 2012-04-12 Tatsuo Fukushi Low temperature curable amorphous fluoropolymers
TWI523900B (zh) 2010-07-20 2016-03-01 首威索勒希斯股份有限公司 氟彈性體組合物
US8309641B2 (en) * 2010-08-13 2012-11-13 E I Du Pont De Nemours And Company Curable fluoroelastomer compositions
GB201108963D0 (en) 2011-05-27 2011-07-13 3M Innovative Properties Co Composite materials comprising polyamides and fluoroelastomers
EP2557109B1 (en) 2011-08-11 2019-01-23 3M Innovative Properties Company Method of bonding a fluoroelastomer compound to a metal substrate using low molecular weight functional hydrocarbons as bonding promoter
US12064919B2 (en) 2015-10-15 2024-08-20 Saint-Gobain Ceramics & Plastics, Inc. Method for forming a three dimensional body from a mixture with a high content of solid particles
US11326040B2 (en) 2016-12-28 2022-05-10 3M Innovative Properties Company Silicon-containing halogenated elastomers
CA3069982C (en) 2017-07-21 2023-08-01 Saint-Gobain Performance Plastics Corporation Method of forming a three-dimensional body
WO2019126298A1 (en) 2017-12-22 2019-06-27 3M Innovative Properties Company Peroxide-cured halogenated elastomers having a silicon-containing superficial layer
EP3755745B1 (en) 2018-02-19 2021-07-21 3M Innovative Properties Company Blends of crosslinking agents for fluoroelastomers
EP3755739A1 (en) 2018-02-19 2020-12-30 3M Innovative Properties Company Curable fluoroelastomer composition
CN111757908A (zh) 2018-02-19 2020-10-09 3M创新有限公司 可固化含氟弹性体组合物
US20210155774A1 (en) 2018-04-10 2021-05-27 3M Innovative Properties Company Blends of crosslinking agents for fluoroelastomers
US20210108101A1 (en) 2018-06-12 2021-04-15 3M Innovative Properties Company Fluorinated polymer coating compositions and articles therefrom
US11859074B2 (en) 2018-06-13 2024-01-02 3M Innovative Properties Company Curable fluoroelastomer composition
US20210292533A1 (en) 2018-08-13 2021-09-23 3M Innovative Properties Company Curable fluoroelastomer composition
WO2020121125A1 (en) 2018-12-14 2020-06-18 3M Innovative Properties Company Curable fluoropolymer compositions comprising a bis phthalonitrile-containing compound and cured articles therefrom
WO2020245683A1 (en) 2019-06-06 2020-12-10 3M Innovative Properties Company Curable fluoropolymer compositions comprising a compound containing a phthalonitrile and a nucleophilic functional group and cured articles therefrom
US20220227718A1 (en) 2019-06-28 2022-07-21 3M Innovative Properties Company Hydroxy-Functionalized Triazine Compounds, Curable Fluoropolymer Compositions Comprising Such Compounds and Cured Articles Therefrom
KR20220054792A (ko) 2019-08-27 2022-05-03 쓰리엠 이노베이티브 프로퍼티즈 컴파니 금속 불화물 입자를 포함하는 경화성 플루오로중합체 조성물 및 이로부터의 물품
WO2022059576A1 (ja) * 2020-09-18 2022-03-24 ダイキン工業株式会社 フッ素ゴム架橋用組成物および成形品
JP7492172B2 (ja) * 2022-04-05 2024-05-29 ダイキン工業株式会社 フッ素ゴム架橋用組成物および成形品
EP4506415A1 (en) * 2022-04-05 2025-02-12 Daikin Industries, Ltd. Fluorine-based rubber crosslinking composition and molded article
CN116678963A (zh) * 2023-04-19 2023-09-01 厦门恒坤新材料科技股份有限公司 一种光刻胶中光致产酸剂的鉴定方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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US2807648A (en) * 1955-09-16 1957-09-24 Stauffer Chemical Co Process for making sulfonium compounds
US3844877A (en) * 1969-07-30 1974-10-29 Union Carbide Corp Carbonaceous fabric laminate
US3988502A (en) * 1970-01-16 1976-10-26 Minnesota Mining And Manufacturing Company Cured fluorinated elastomer
US3655727A (en) * 1970-01-16 1972-04-11 Minnesota Mining & Mfg Curing systems for vinylidine fluoride elastomers
US3712877A (en) * 1971-07-06 1973-01-23 Minnesota Mining & Mfg Curable vinylidene fluoride elastomers containing phosphonium curing agents
US3933732A (en) * 1972-09-28 1976-01-20 E. I. Du Pont De Nemours And Company Fluoroelastomer composition and curing process
ES430729A1 (es) * 1973-10-16 1976-10-01 Minnesota Mining & Mfg Un procedimiento para curar un copolimero elestomero de fluoruro de vinilideno y un comometro fluorado terminal y etilenicamente insaturado.
DE2644591A1 (de) * 1976-10-02 1978-04-06 Bayer Ag Verfahren zur herstellung von arylsulfoniumsalzen

Also Published As

Publication number Publication date
JPS64418B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1989-01-06
FR2449707B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1984-02-17
FR2449707A1 (fr) 1980-09-19
GB2044270B (en) 1983-04-20
IT1128097B (it) 1986-05-28
US4233421A (en) 1980-11-11
JPS55116748A (en) 1980-09-08
IT8047997A0 (it) 1980-02-25
GB2044270A (en) 1980-10-15
DE3006920A1 (de) 1980-09-04

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Legal Events

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8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: C08L 27/16

8128 New person/name/address of the agent

Representative=s name: VOSSIUS, V., DIPL.-CHEM. DR.RER.NAT. TAUCHNER, P.,

D2 Grant after examination
8328 Change in the person/name/address of the agent

Free format text: TAUCHNER, P., DIPL.-CHEM. DR.RER.NAT. HEUNEMANN, D., DIPL.-PHYS. DR.RER.NAT. RAUH, P., DIPL.-CHEM. DR.RER.NAT., PAT.-ANWAELTE, 8000 MUENCHEN

8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: DYNEON LLC, OAKDALE, MINN., US