IN1996KO01040A - - Google Patents

Info

Publication number
IN1996KO01040A
IN1996KO01040A IN1040KO1996A IN1996KO01040A IN 1996KO01040 A IN1996KO01040 A IN 1996KO01040A IN 1040KO1996 A IN1040KO1996 A IN 1040KO1996A IN 1996KO01040 A IN1996KO01040 A IN 1996KO01040A
Authority
IN
India
Prior art keywords
mixture
polymerization
heated
controlled atmosphere
solvent
Prior art date
Application number
Other languages
English (en)
Inventor
Clarence S Freeman
Matthew Max Freeman
Jon Joseph Freeman
Original Assignee
Clarence S Freeman
Matthew Max Freeman
Jon Joseph Freeman
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27413475&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=IN1996KO01040(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Clarence S Freeman, Matthew Max Freeman, Jon Joseph Freeman filed Critical Clarence S Freeman
Publication of IN1996KO01040A publication Critical patent/IN1996KO01040A/en

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
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/04—Acids, Metal salts or ammonium salts thereof
    • C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J10/00—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor
    • B01J10/002—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor carried out in foam, aerosol or bubbles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J14/00—Chemical processes in general for reacting liquids with liquids; Apparatus specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/26—Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/10—Making granules by moulding the material, i.e. treating it in the molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00076—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements inside the reactor
    • B01J2219/00083—Coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/0009—Coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/00099—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor the reactor being immersed in the heat exchange medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00132—Controlling the temperature using electric heating or cooling elements
    • B01J2219/00135—Electric resistance heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/0015—Controlling the temperature by thermal insulation means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00162—Controlling or regulating processes controlling the pressure

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polymerisation Methods In General (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
IN1040KO1996 1995-06-07 1996-06-05 IN1996KO01040A (enExample)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US47916795A 1995-06-07 1995-06-07
US48380095A 1995-06-07 1995-06-07
US48607995A 1995-06-07 1995-06-07

Publications (1)

Publication Number Publication Date
IN1996KO01040A true IN1996KO01040A (enExample) 2005-03-04

Family

ID=27413475

Family Applications (1)

Application Number Title Priority Date Filing Date
IN1040KO1996 IN1996KO01040A (enExample) 1995-06-07 1996-06-05

Country Status (7)

Country Link
EP (1) EP0873185B1 (enExample)
JP (1) JPH11507094A (enExample)
AT (1) ATE240780T1 (enExample)
BR (1) BR9609057A (enExample)
DE (1) DE69628330D1 (enExample)
IN (1) IN1996KO01040A (enExample)
WO (1) WO1996040427A1 (enExample)

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391986B1 (en) 2000-12-05 2002-05-21 Union Carbide Chemicals & Plastics Technology Corporation Control of solution catalyst droplets
US6869551B2 (en) * 2001-03-30 2005-03-22 Picoliter Inc. Precipitation of solid particles from droplets formed using focused acoustic energy
DE10314466A1 (de) * 2003-03-28 2004-10-14 Basf Ag Verfahren zur Herstellung von kondensierten Harzen in Pulverform
DE10340253A1 (de) * 2003-08-29 2005-03-24 Basf Ag Sprühpolymerisationsverfahren
CA2557199A1 (en) * 2004-02-24 2005-09-09 Luna Innovations Incorporated Process and systems for the efficient production of polymeric microspheres
DE102004024437A1 (de) * 2004-05-14 2005-12-08 Basf Ag Verfahren zur Herstellung wasserquellbarer, polymerer Partikel
DE102004042948A1 (de) 2004-09-02 2006-03-09 Basf Ag Verfahren zur Herstellung von Polymeren durch Sprühpolymerisation
DE102005002412A1 (de) 2005-01-18 2006-07-27 Basf Ag Verfahren zur Herstellung von Polymeren durch Sprühpolymerisation
JP5101300B2 (ja) 2005-01-28 2012-12-19 ビーエーエスエフ ソシエタス・ヨーロピア 気相中での液滴重合によって、吸水性ポリマー粒子を製造する方法
DE102005019398A1 (de) * 2005-04-25 2006-10-26 Basf Ag Verfahren zur Herstellung von Fällungspolymeren durch Sprühpolymerisation
DE102005044035A1 (de) 2005-09-14 2007-03-15 Basf Ag Verfahren zum Vertropfen von Flüssigkeiten
WO2007093531A1 (de) * 2006-02-17 2007-08-23 Basf Se Verfahren zur herstellung wasserabsorbierender polymerpartikel durch polymerisation von tropfen einer monomerlösung
US8124229B2 (en) 2006-07-19 2012-02-28 Basf Se Method for producing water-absorbent polymer particles with a higher permeability by polymerising droplets of a monomer solution
MY157687A (en) 2006-07-19 2016-07-15 Basf Se Process for preparing water-absorbing polymer particle having high permeability by polymerization
CN101489596B (zh) 2006-07-19 2013-05-15 巴斯夫欧洲公司 通过聚合单体溶液液滴生产具有较高吸收的后固化的吸水性聚合物颗粒的方法
BRPI0714447B1 (pt) * 2006-07-19 2019-02-19 Basf Se Processo para preparar partículas poliméricas absorvedoras de água, partículas poliméricas absorvedoras de água, uso das particulás poliméricas, e, artigo de higiene
EP2046402B2 (de) * 2006-07-19 2019-09-11 Basf Se Verfahren zur herstellung wasserabsorbierender polymerpartikel durch polymerisation von tropfen einer monomerlösung
JP5669394B2 (ja) 2006-10-05 2015-02-12 ビーエーエスエフ ソシエタス・ヨーロピアBasf Se 吸水性ポリマー粒子をモノマー溶液の液滴の重合によって製造する方法
ATE491729T1 (de) 2006-10-05 2011-01-15 Basf Se Verfahren zur herstellung wasserabsorbierender polymerpartikel durch polymerisation von tropfen einer monomerlösung
BRPI0717756B1 (pt) 2006-10-31 2018-01-30 Basf Se Processo para a produção de partículas poliméricas absorventes de água
CN101573147B (zh) 2006-12-22 2013-03-06 巴斯夫欧洲公司 制备机械稳定的吸水性聚合物粒子的方法
MY146772A (en) 2006-12-22 2012-09-28 Basf Se Method for producing mechanically stable water-absorbent polymer particles
WO2008095901A1 (de) 2007-02-06 2008-08-14 Basf Se Verfahren zur herstellung wasserabsorbierender polymerpartikel durch polymerisation von tropfen einer monomerlösung
DE102008043523A1 (de) 2007-11-16 2009-05-20 Basf Se Verfahren zur Herstellung von Polyvinylpyrrolidonen durch Sprühpolymerisation
US8912298B2 (en) 2008-03-31 2014-12-16 Nippon Shokubai Co., Ltd. Method for producing particulate water absorbing agent containing water absorbent resin as main component
CN102083865B (zh) 2008-07-07 2013-01-02 巴斯夫欧洲公司 通过聚合单体溶液的液滴生产吸水性聚合物颗粒的方法
US8669410B2 (en) 2008-08-06 2014-03-11 Basf Se Fluid-absorbent articles
WO2010015591A1 (en) 2008-08-06 2010-02-11 Basf Se Fluid-absorbent articles
US8895800B2 (en) 2008-08-06 2014-11-25 Basf Se Fluid absorbent articles
WO2010057912A1 (de) 2008-11-21 2010-05-27 Basf Se Verfahren zur herstellung permeabler wasserabsorbierender polymerpartikel durch polymerisation von tropfen einer monomerlösung
EP2277558B1 (en) 2009-07-20 2014-07-02 The Procter and Gamble Company Superabsorbent polymer composite particles and processes therefore
EP2277557B1 (en) 2009-07-20 2014-06-25 The Procter and Gamble Company Coated superabsorbent polymer particles and processes therefore
JP5661769B2 (ja) 2009-08-25 2015-01-28 ビーエーエスエフ ソシエタス・ヨーロピアBasf Se モノマー溶液の液滴の重合によって改善された血液吸収を有する、吸水性ポリマー粒子の製造方法
US20120157302A1 (en) 2009-08-28 2012-06-21 Basf Se Process For Producing Triclosan-Coated Superabsorbents
US8481159B2 (en) 2009-09-04 2013-07-09 Basf Se Water-absorbent porous polymer particles having specific sphericity and high bulk density
CN102597082A (zh) 2009-09-16 2012-07-18 巴斯夫欧洲公司 颜色稳定的超吸收剂
JP2013505313A (ja) 2009-09-17 2013-02-14 ビーエーエスエフ ソシエタス・ヨーロピア 色安定性の超吸収剤
WO2011113728A1 (en) 2010-03-15 2011-09-22 Basf Se A process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution
US8852742B2 (en) 2010-03-15 2014-10-07 Basf Se Water absorbent polymer particles formed by polymerizing droplets of a monomer solution and coated with sulfinic acid, sulfonic acid, and/or salts thereof
KR101782188B1 (ko) 2010-03-24 2017-09-26 바스프 에스이 초박형 유체-흡수성 코어
EP2550306B1 (en) 2010-03-24 2014-07-02 Basf Se A process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution
CN102906124B (zh) 2010-03-24 2014-12-17 巴斯夫欧洲公司 从吸水性聚合物颗粒中移除残余单体的方法
WO2013045163A1 (en) 2011-08-12 2013-04-04 Basf Se A process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution
CN104271622B (zh) 2012-03-30 2017-02-22 巴斯夫欧洲公司 颜色稳定的超吸收剂
WO2013144027A1 (de) 2012-03-30 2013-10-03 Basf Se Farbstabiler superabsorber
WO2014079710A1 (en) 2012-11-21 2014-05-30 Basf Se A process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution
SG11201503955XA (en) 2012-11-21 2015-06-29 Basf Se A process for producing surface-postcrosslinked water-absorbent polymer particles
WO2015014826A1 (en) 2013-07-31 2015-02-05 Basf Se Reverse-phase polymerisation process
EP3039044B1 (en) 2013-08-26 2020-02-12 Basf Se Fluid-absorbent article
EP3096803B1 (en) 2014-01-24 2017-12-20 Basf Se A process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution
US10806640B2 (en) 2016-03-30 2020-10-20 Basf Se Ultrathin fluid-absorbent article
US10881555B2 (en) 2016-03-30 2021-01-05 Basf Se Fluid-absorbent article
US20170281425A1 (en) 2016-03-30 2017-10-05 Basf Se Fluid-absorbent article
US11931928B2 (en) 2016-12-29 2024-03-19 Evonik Superabsorber Llc Continuous strand superabsorbent polymerization
JP7424832B2 (ja) 2017-02-06 2024-01-30 ビーエーエスエフ ソシエタス・ヨーロピア 流体吸収性物品
EP3582734B1 (en) 2017-02-17 2021-12-01 Basf Se Fluid-absorbent article
US11813589B2 (en) 2017-11-10 2023-11-14 Basf Se Superabsorbent complexed with aluminum ions
EP3774999B1 (de) 2018-04-10 2022-08-03 Basf Se Permeabler superabsorber und verfahren zu seiner herstellung
CN112040919B (zh) 2018-04-20 2023-06-27 巴斯夫欧洲公司 薄流体吸收芯-吸收性纸
DE102019216910A1 (de) 2018-11-12 2020-05-14 Basf Se Verfahren zur Oberflächennachvernetzung von Superabsorbern
WO2021013639A1 (en) 2019-07-24 2021-01-28 Basf Se Permeable superabsorbent and process for production thereof
CN112480300A (zh) * 2020-11-30 2021-03-12 浙江卫星新材料科技有限公司 一种光缆电缆阻水用高吸收性树脂的制备方法
IT202100012473A1 (it) * 2021-05-14 2022-11-14 Resourseas S R L Reattore e processo di precipitazione di un prodotto solido

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE514890A (enExample) * 1951-12-18 1900-01-01
US3325455A (en) * 1963-11-21 1967-06-13 Polymer Corp Method of producing nylon powders
US4623706A (en) * 1984-08-23 1986-11-18 The Dow Chemical Company Process for preparing uniformly sized polymer particles by suspension polymerization of vibratorily excited monomers in a gaseous or liquid stream
JPH0819163B2 (ja) * 1988-04-20 1996-02-28 旭化成工業株式会社 高吸水性材料の製法
US4963226A (en) * 1989-01-23 1990-10-16 The Procter & Gamble Company Process for spray-drying detergent compositions
GB9115170D0 (en) * 1991-07-12 1991-08-28 Dow Corning Sa Process and apparatus for the production of organosilicon compounds
US5269980A (en) * 1991-08-05 1993-12-14 Northeastern University Production of polymer particles in powder form using an atomization technique

Also Published As

Publication number Publication date
EP0873185B1 (en) 2003-05-21
JPH11507094A (ja) 1999-06-22
ATE240780T1 (de) 2003-06-15
BR9609057A (pt) 2002-07-16
DE69628330D1 (de) 2003-06-26
EP0873185A1 (en) 1998-10-28
WO1996040427A1 (en) 1996-12-19

Similar Documents

Publication Publication Date Title
BR9609057A (pt) Pó de partìcula de polìmero
CA2198447A1 (en) Process for the production of latices based on conjugated dienes by emulsion polymerisation
DE69911801D1 (de) Redispergierbares pulver und seine wässrige dispersion, herstellungsverfahren und verwendung
MY134744A (en) Polymerization processes and toner compositions therefrom
TW367334B (en) Process for producing poly-olefin grafted copolymers
CA2019556A1 (en) Precipitation polymerization of terpolymers of a vinyl lactam a polymerizable carboxylic acid and a hydrophobic monomer in an aliphatic hydrocarbon solvent
ES2126045T5 (es) Copolimeros de bloques de composicion gradualmente variable de monovinilarenos y dienos conjugados.
EP0173789A3 (en) Process for producing emulsion of vinyl resin having microvoids therein, and process for its powderization
CA2227284A1 (en) A process for preparing microparticles through phase inversion phenomena
HU173513B (hu) Sposob polimerizacii vinilkhlorida v sshitojj mikrosuspensii
ES439556A1 (es) Procedimiento y aparato para obtener dispersiones de polime-rizados con bajo contenido de monomeros.
WO1999007755A3 (en) Process for the preparation of macromers
AU1754399A (en) Method for producing water-soluble or water-swellable polymerizates with a very low residual monomer content, products produced according to this method and the use thereof
ATE269358T1 (de) Verfahren zur herstellung wässriger polymerdispersionen
DE50102469D1 (de) Verfahren zur einstellung der teilchengrösse von popcornpolymeren während der popcornpolymerisation
TW430671B (en) A polymerization process, apparatus and polymer
ATE225811T1 (de) Polymere emulgatoren für die vinylchlorid- polymerisation
JPS5247092A (en) Process for preparing high-impact resins
EP0372599A3 (en) Process for the polymerization of structurally different monomers
ES475355A1 (es) Procedimiento para desecar polimeros disueltos
Ryttel Solution copolymerization of alkyl methacrylates and N–vinyl carbazole: Reactivity ratios
FR2398079A2 (fr) Procede de polymerisation anionique a l'aide de cryptants
JPS5548201A (en) Graft polymer of polysaccharide ester and its manufacture
Chelysheva et al. On the Role of Diethylaminoethyl Methacrylate in Graft Polymerization to Polycaproamide Fiber
JPS55145714A (en) Preparation of copolymer of alkyl vinyl ether and maleic anhydride