NL135065C - - Google Patents

Info

Publication number
NL135065C
NL135065C NL135065DC NL135065C NL 135065 C NL135065 C NL 135065C NL 135065D C NL135065D C NL 135065DC NL 135065 C NL135065 C NL 135065C
Authority
NL
Netherlands
Application number
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.)
Publication of NL135065C publication Critical patent/NL135065C/xx

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02—Ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/902—Monomer polymerized in bulk in presence of transition metal containing catalyst
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/905—Polymerization in presence of transition metal containing catalyst in presence of hydrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/912—Reaction medium purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
NL135065D 1965-05-14 NL135065C (en:Method)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US455941A US3324101A (en) 1965-05-14 1965-05-14 Olefin polymerization process and catalyst therefor
US455975A US3324095A (en) 1965-05-14 1965-05-14 Polymerization process

Publications (1)

Publication Number Publication Date
NL135065C true NL135065C (en:Method)

Family

ID=27038028

Family Applications (2)

Application Number Title Priority Date Filing Date
NL135065D NL135065C (en:Method) 1965-05-14
NL6606632A NL6606632A (en:Method) 1965-05-14 1966-05-13

Family Applications After (1)

Application Number Title Priority Date Filing Date
NL6606632A NL6606632A (en:Method) 1965-05-14 1966-05-13

Country Status (7)

Country Link
US (2) US3324101A (en:Method)
BE (1) BE680954A (en:Method)
DE (1) DE1645585C2 (en:Method)
DK (1) DK130722B (en:Method)
GB (1) GB1146145A (en:Method)
NL (2) NL6606632A (en:Method)
SE (1) SE388863B (en:Method)

Families Citing this family (109)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513150A (en) * 1965-11-23 1970-05-19 Mitsubishi Chem Ind Method of manufacturing polyethylene
US3513151A (en) * 1965-12-27 1970-05-19 Owens Illinois Inc Reaction product of metal oxides and hydrocarbylcyclosiloxanes and method of polymerization using same
US3474080A (en) * 1966-06-27 1969-10-21 Nat Distillers Chem Corp Catalytic process for olefin polymerization
US3493554A (en) * 1966-06-27 1970-02-03 Nat Distillers Chem Corp Olefin polymerization process employing a chromate catalyst
US3468865A (en) * 1966-12-23 1969-09-23 Owens Illinois Inc Polymerization and catalysts
US3535297A (en) * 1968-02-14 1970-10-20 Union Carbide Corp Polymerization of ethylene using supported activated chromyl chloride catalysts
GB1241134A (en) * 1968-05-25 1971-07-28 Mitsubishi Chem Ind Olefin polymerisation catalyst
US3839313A (en) * 1968-10-09 1974-10-01 Montedison Spa Catalysts for the polymerization of olefins
CA995396A (en) * 1971-03-18 1976-08-17 Robert N. Johnson Catalyst modified with strong reducing agent and silane compounds and use in polymerization of olefins
FR2207145B1 (en:Method) * 1972-11-17 1975-09-12 Naphtachimie Sa
US4020092A (en) * 1973-11-08 1977-04-26 Chemplex Company Compounds bis(tributyltin)chromate and bis(triphenyltin)chromate
US3876554A (en) * 1973-11-08 1975-04-08 Chemplex Co Organotin chromate polymerization catalyst
US3884832A (en) * 1974-02-04 1975-05-20 Chemplex Co Organotin chromate polymerization catalyst
SE392112B (sv) * 1974-04-19 1977-03-14 Unifos Kemi Ab Lagtryckspolyetenkomposition innehallande fosfonsyraderivat
US4053435A (en) * 1975-03-12 1977-10-11 Gulf Research & Development Company Catalysts for the polymerization of ethylene
US4192775A (en) * 1975-03-14 1980-03-11 National Petro Chemicals Corporation Olefin polymerization catalyst
US3984351A (en) * 1975-03-14 1976-10-05 National Petro Chemicals Corporation Olefin polymerization catalyst
US4031298A (en) * 1975-06-30 1977-06-21 Chemplex Company Polymerization catalyst and method
IT1039828B (it) * 1975-07-09 1979-12-10 Montedison Spa Componenti di catalizzatori perla polimerizzazione di olefine e catalizzatori da essi ottenuti
US3956257A (en) * 1975-08-14 1976-05-11 Phillips Petroleum Company Hydrocarbylaluminum hydrocarbyloxide antifouling agent in olefin polymerization process
US4053437A (en) * 1976-03-04 1977-10-11 Chemplex Company Polyolefin catalyst and method for its preparation
US4065612A (en) * 1976-03-30 1977-12-27 Union Carbide Corporation Phenol modified polymerization catalyst and polymerization process
US4100105A (en) * 1977-01-21 1978-07-11 Union Carbide Corporation Titanium-modified silyl chromate catalysts for ethylene polymerization
DE2802763A1 (de) * 1978-01-23 1979-07-26 Hoechst Ag Verfahren zur herstellung eines katalysators
US4297461A (en) * 1979-06-08 1981-10-27 National Petro Chemicals Corp. Olefin polymerization catalyst
US4260706A (en) * 1979-06-21 1981-04-07 National Petro Chemicals Corp. Olefin polymerization catalyst
US4460755A (en) * 1982-09-30 1984-07-17 Union Carbide Corporation Direct conversion of a polymerization reaction catalyzed by a Ziegler-type catalyst into one catalyzed by a chromium-based catalyst
US4806513A (en) * 1984-05-29 1989-02-21 Phillips Petroleum Company Silicon and fluorine-treated alumina containing a chromium catalyst and method of producing same
US4540757A (en) * 1984-10-01 1985-09-10 Phillips Petroleum Company Polymerization and catalyst
US4560733A (en) * 1984-10-01 1985-12-24 Phillips Petroleum Company Polymerization and catalyst
US4803251A (en) 1987-11-04 1989-02-07 Union Carbide Corporation Method for reducing sheeting during polymerization of alpha-olefins
CA2020509C (en) * 1989-08-10 1998-04-28 William K. Reagen Chromium compounds and uses thereof
US5034364A (en) * 1989-11-09 1991-07-23 Mobil Oil Corporation Multiple chromium compound-containing catalyst composition and olefin polymerization therewith
FI902123A7 (fi) * 1990-04-26 1991-10-27 Borealis Holding As Siirtymämetallipohjainen katalyytti olefiinien polymeroimiseksi ja kopolymeroimiseksi, sen valmistus ja käyttö
US5137994A (en) * 1991-05-23 1992-08-11 Union Carbide Chemicals & Plastics Technology Corporation Process for the simultaneous trimerization and copolymerization of ethylene
US5443874A (en) * 1993-05-24 1995-08-22 Mitsubishi Petrochemical Co., Ltd. Hollow multi-layer molding
CN1166701C (zh) 1998-12-29 2004-09-15 切夫里昂菲利普化学有限责任公司 改进的铬酸酯催化剂及用其生产高性能聚乙烯产品的方法
CZ288056B6 (cs) * 1999-04-08 2001-04-11 Polymer Institute Brno, Spol. S R. O. Způsob přípravy kopolymerů ethylenu vhodných pro výrobu fólií nebo trubek
JP4988157B2 (ja) 2002-10-02 2012-08-01 ダウ グローバル テクノロジーズ エルエルシー 低粘度均一分枝化エチレン／α−オレフィンエクステンダーを含むポリマー組成物
US20100291334A1 (en) * 2002-12-27 2010-11-18 Univation Technologies, Llc Broad Molecular Weight Polyethylene Having Improved Properties
US6989344B2 (en) 2002-12-27 2006-01-24 Univation Technologies, Llc Supported chromium oxide catalyst for the production of broad molecular weight polyethylene
US20040167015A1 (en) * 2003-02-26 2004-08-26 Cann Kevin J. Production of broad molecular weight polyethylene
US7202313B2 (en) * 2003-03-28 2007-04-10 Union Carbide Chemicals & Plastics Technology Corporation Chromium-based catalysts in mineral oil for production of polyethylene
US6982304B2 (en) * 2003-12-22 2006-01-03 Union Carbide Chemicals & Plastics Technology Corporation Blow molding resins with improved ESCR
US7151073B2 (en) * 2004-01-16 2006-12-19 Exxonmobil Chemical Patents Inc. Mesoporous catalyst support, a catalyst system, and method of making and using same for olefin polymerization
WO2006107373A1 (en) * 2005-03-31 2006-10-12 Exxonmobil Chemical Patents Inc. Processes for producing high density polyethylene
US8324330B2 (en) * 2006-03-31 2012-12-04 Saudi Basic Industires Corporation Process for the preparation of a silylchromate catalyst
US20140179882A9 (en) 2008-02-21 2014-06-26 Univation Technologies, Llc Systems and Methods for Fabricating Polymers
ES2399062T3 (es) 2008-12-22 2013-03-25 Univation Technologies, Llc Sistemas y métodos para fabricar polímeros
WO2010080870A2 (en) 2009-01-08 2010-07-15 Univation Technologies,Llc Additive for polyolefin polymerization processes
WO2010080871A1 (en) 2009-01-08 2010-07-15 Univation Technologies, Llc Additive for gas phase polymerization processes
BR112012000454A2 (pt) * 2009-07-09 2016-02-16 Union Carbide Chem Plastic processo de polimerização em fase gasosa para produzir polímero de polietileno, polímero de polietileno e sistema para melhorar iniciação de catalisador
US8722820B2 (en) 2009-12-07 2014-05-13 Univation Technologies, Llc Methods for reducing static charge of a catalyst and methods for using the catalyst to produce polyolefins
CN102453154B (zh) * 2010-10-22 2013-07-24 中国石油化工股份有限公司 乙烯聚合用有机铬催化剂及其制备方法
CN102627710B (zh) * 2012-04-16 2017-12-29 华东理工大学 一种负载型双中心复合聚乙烯催化剂的制备方法和应用
EP2935352B1 (en) * 2012-12-19 2020-08-26 Saudi Basic Industries Corporation Polymerisation of ethylene in the presence of a silylchromate based catalyst.
JP2017502104A (ja) 2013-11-21 2017-01-19 ユニベーション・テクノロジーズ・エルエルシー ポリマー特性を制御するための方法
WO2015078885A2 (en) 2013-11-28 2015-06-04 Saudi Basic Industries Corporation Chromium-based catalyst component comprising a modified inorganic oxide support
EP3149061B1 (en) 2014-05-27 2019-03-13 SABIC Global Technologies B.V. Process for transitioning between incompatible catalysts
SG10201801625SA (en) 2014-09-02 2018-03-28 Univation Tech Llc Polyolefin production with chromium-based catalysts
SG10201801618TA (en) 2014-09-02 2018-03-28 Univation Tech Llc Polyolefin production with chromium-based catalysts
EP3188831B1 (en) 2014-09-02 2020-10-28 Univation Technologies, LLC Polyolefin production with chromium-based catalysts
WO2016085842A2 (en) 2014-11-24 2016-06-02 Univation Technologies, Llc Chromium-based catalyst compositions for olefin polymerization
WO2016085856A1 (en) 2014-11-24 2016-06-02 Univation Technologies, Llc Composition comprising particles
WO2016177643A1 (en) 2015-05-05 2016-11-10 Sabic Global Technologies B.V. Compositions for automotive interior parts
EP3313901B1 (en) 2015-06-23 2019-04-10 SABIC Global Technologies B.V. Polymerisation of ethylene in the presence of a silylchromate based catalyst
BR112018014196B1 (pt) 2016-01-29 2022-07-05 Univation Technologies, Llc Filme e método para fazer um filme tendo impacto de dardo melhorado
BR112018069517B1 (pt) 2016-04-20 2022-12-20 Univation Technologies, Llc Método para modificar um índice de fluxo de polímero
ES2919777T3 (es) 2016-11-08 2022-07-28 Univation Tech Llc Polietileno bimodal
EP3778666B1 (en) 2016-11-08 2023-12-13 Univation Technologies, LLC Polyethylene composition
CN109890855B (zh) 2016-11-08 2022-08-09 尤尼威蒂恩技术有限责任公司 聚乙烯组合物
CN109963883B (zh) 2016-11-28 2023-02-03 尤尼威蒂恩技术有限责任公司 生产聚乙烯聚合物
WO2018111631A1 (en) 2016-12-15 2018-06-21 Univation Technologies, Llc Rating polymerization processes
WO2019046085A1 (en) 2017-08-28 2019-03-07 Univation Technologies, Llc BIMODAL POLYETHYLENE
CN111051419A (zh) 2017-09-11 2020-04-21 尤尼威蒂恩技术有限责任公司 含有碳黑的双峰聚乙烯组合物
EP3700946B1 (en) 2017-10-27 2021-09-08 Univation Technologies, LLC Selectively transitioning polymerization processes
SG11202003356WA (en) 2017-10-27 2020-05-28 Univation Tech Llc Polyethylene copolymer resins and films
CN111417660B (zh) 2017-12-05 2023-12-05 尤尼威蒂恩技术有限责任公司 活化的喷雾干燥齐格勒-纳塔催化剂体系
KR102636033B1 (ko) 2017-12-05 2024-02-14 유니베이션 테크놀로지즈, 엘엘씨 변형된 분무-건조된 지글러-나타 (전구)촉매 시스템
EP3728349A1 (en) 2017-12-18 2020-10-28 Dow Global Technologies LLC Hafnocene-titanocene catalyst system
JP7313350B2 (ja) 2017-12-18 2023-07-24 ダウ グローバル テクノロジーズ エルエルシー ジルコノセン－チタノセン触媒系
EP3774943B1 (en) 2018-03-26 2025-07-23 Dow Global Technologies LLC Spray-dried zirconocene catalyst system
EP3774940A1 (en) 2018-03-28 2021-02-17 Univation Technologies, LLC Multimodal polyethylene composition
CA3037503A1 (en) 2018-04-26 2019-10-26 Nova Chemicals Corporation Phosphinimine amido-ether complexes
EP3802640A1 (en) 2018-05-24 2021-04-14 Univation Technologies, LLC Unimodal polyethylene copolymer and film thereof
CN112166128B (zh) 2018-06-12 2023-06-06 陶氏环球技术有限责任公司 活化剂-成核剂配制物
CA3102431A1 (en) 2018-06-13 2019-12-19 Univation Technologies, Llc Spray-dried ziegler-natta (pro)catalyst systems
SG11202100286QA (en) 2018-07-31 2021-03-30 Univation Tech Llc Unimodal polyethylene copolymer and film thereof
US11649305B2 (en) 2018-07-31 2023-05-16 Univation Technologies, Llc Unimodal polyethylene copolymer and film thereof
CN109438593B (zh) * 2018-11-26 2020-09-22 上海化工研究院有限公司 一种生产超高分子量聚烯烃用催化剂及其制备方法和应用
EP3715385B1 (en) 2019-03-26 2024-01-31 SABIC Global Technologies B.V. Chromium oxide catalyst for ethylene polymerization
CA3142138A1 (en) 2019-06-10 2020-12-17 Univation Technologies, Llc Polyethylene blend
BR112022019747A2 (pt) 2020-04-01 2022-11-16 Dow Global Technologies Llc Copolímero de polietileno de baixa densidade linear bimodal, e, artigo fabricado
BR112022021159A2 (pt) 2020-04-21 2022-12-06 Nova Chem Int Sa Complexos de ciclopentadienil/adamantil fosfinimina zircônio e háfnio
ES2989809T3 (es) 2020-04-21 2024-11-27 Nova Chem Int Sa Complejos de ciclopentadienil/adamantilfosfinimina de titanio
CA3193704A1 (en) 2020-09-30 2022-04-07 Rujul M. MEHTA Bimodal polyethylene copolymers for pe-80 pipe applications
JP2024524131A (ja) 2021-06-22 2024-07-05 イクイスター・ケミカルズ・エルピー ポリマーリサイクレートプロセスおよび製品
JP2025525806A (ja) 2022-08-04 2025-08-07 イクイスター・ケミカルズ・エルピー ポリエチレンリサイクル材ブレンド生成物
CN120418310A (zh) 2022-12-20 2025-08-01 Sabic环球技术有限责任公司 用于生产聚乙烯的方法
WO2024132273A1 (en) 2022-12-20 2024-06-27 Sabic Global Technologies B.V. Catalyst for polyethylene polymerization
WO2024253862A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysts comprising substituted 2-hydroxythiophene compounds
WO2024253859A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysts comprising substituted 2-hydroxythiophene compounds
WO2024253861A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysys comprising substituted 2-hydroxythiophene compounds
WO2024253863A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysts comprising substituted 2-hydroxythiophene compounds
WO2024253860A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysts comprising substituted 2-hydroxythiophene compounds
WO2024253864A1 (en) 2023-06-08 2024-12-12 Dow Global Technologies Llc Supported olefin polymerization catalysts comprising substituted 2-hydroxythiophene compounds
US20250002698A1 (en) 2023-06-27 2025-01-02 Equistar Chemicals, Lp Polymer recyclate blend product and process
CN119264188A (zh) * 2023-07-04 2025-01-07 中国石油天然气股份有限公司 铬系化合物及其制备方法与应用、苄醇类化合物催化氧化的方法
US20250243351A1 (en) 2024-01-29 2025-07-31 Equistar Chemicals, Lp Polyethylene recyclate blend products

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE637740A (en:Method) *
US2863891A (en) * 1955-03-18 1958-12-09 Little Inc A Metal organo-silyl esters
US2882264A (en) * 1955-10-10 1959-04-14 Dow Chemical Co Polymerization of ethylene
US2981725A (en) * 1955-11-16 1961-04-25 Shell Oil Co Process for polymerizing olefins
US2898328A (en) * 1956-07-10 1959-08-04 Ici Ltd Polymerisation of olefins
BE568912A (en:Method) * 1957-06-28
NL235501A (en:Method) * 1959-01-27
US2994711A (en) * 1959-08-10 1961-08-01 Nat Distillers Chem Corp Triorganosiloxymetal oxides
US3046268A (en) * 1959-09-22 1962-07-24 Nat Distillers Chem Corp Catalytic process for polymerizaing ethylenically unsaturated hydrocarbons
US3046267A (en) * 1959-09-22 1962-07-24 Nat Distillers Chem Corp Catalytic process for polymerizing ethylenically unsaturated hydrocarbons
NL128841C (en:Method) * 1963-06-21

Also Published As

Publication number Publication date
DE1645585C2 (de) 1983-05-11
US3324095A (en) 1967-06-06
DE1645585A1 (de) 1970-07-09
BE680954A (en:Method) 1966-11-14
SE388863B (sv) 1976-10-18
US3324101A (en) 1967-06-06
GB1146145A (en) 1969-03-19
DK130722C (en:Method) 1975-09-01
NL6606632A (en:Method) 1966-11-15
DK130722B (da) 1975-04-01

Similar Documents

Publication Publication Date Title
DK130722C (en:Method)
JPS4917331B1 (en:Method)
JPS438558Y1 (en:Method)
DD37833A1 (en:Method)
JPS432316Y1 (en:Method)
JPS434778Y1 (en:Method)
JPS445744Y1 (en:Method)
BE674971A (en:Method)
BE674790A (en:Method)
NL6602964A (en:Method)
NL6505160A (en:Method)
BE664190A (en:Method)
BE660222A (en:Method)
NL6607592A (en:Method)
BE673394A (en:Method)
BE682647A (en:Method)
BE675057A (en:Method)
BE675042A (en:Method)
BE665466A (en:Method)
BE675019A (en:Method)
BE675018A (en:Method)
BE674974A (en:Method)
BE672891A (en:Method)
BE666759A (en:Method)
BE674816A (en:Method)