GB2329897B - Brominated polystyrene and process for the preparation thereof - Google Patents

Brominated polystyrene and process for the preparation thereof

Info

Publication number
GB2329897B
GB2329897B GB9827416A GB9827416A GB2329897B GB 2329897 B GB2329897 B GB 2329897B GB 9827416 A GB9827416 A GB 9827416A GB 9827416 A GB9827416 A GB 9827416A GB 2329897 B GB2329897 B GB 2329897B
Authority
GB
United Kingdom
Prior art keywords
polystyrene
solution
bromination
backbone
reactant
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 - Fee Related
Application number
GB9827416A
Other languages
English (en)
Other versions
GB2329897A (en
GB9827416D0 (en
Inventor
James C Gill
James L Dever
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.)
Vibrantz Corp
Original Assignee
Ferro Corp
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=24653227&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB2329897(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ferro Corp filed Critical Ferro Corp
Publication of GB9827416D0 publication Critical patent/GB9827416D0/en
Publication of GB2329897A publication Critical patent/GB2329897A/en
Application granted granted Critical
Publication of GB2329897B publication Critical patent/GB2329897B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/18—Introducing halogen atoms or halogen-containing groups
    • C08F8/20—Halogenation
    • C08F8/22—Halogenation by reaction with free halogens

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
GB9827416A 1996-06-14 1997-05-30 Brominated polystyrene and process for the preparation thereof Expired - Fee Related GB2329897B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/661,350 US5637650A (en) 1996-06-14 1996-06-14 Brominated polysytrene having improved thermal stability and color and process for the preparation thereof
PCT/US1997/009598 WO1997047663A1 (en) 1996-06-14 1997-05-30 Brominated polystyrene having improved thermal stability and color and process for the preparation thereof

Publications (3)

Publication Number Publication Date
GB9827416D0 GB9827416D0 (en) 1999-02-03
GB2329897A GB2329897A (en) 1999-04-07
GB2329897B true GB2329897B (en) 2001-01-10

Family

ID=24653227

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9827416A Expired - Fee Related GB2329897B (en) 1996-06-14 1997-05-30 Brominated polystyrene and process for the preparation thereof

Country Status (9)

Country Link
US (3) US5637650A (OSRAM)
EP (1) EP0906345B1 (OSRAM)
JP (2) JP2000512328A (OSRAM)
AT (1) ATE294191T1 (OSRAM)
AU (1) AU3154597A (OSRAM)
CA (1) CA2256530C (OSRAM)
DE (1) DE69733136T2 (OSRAM)
GB (1) GB2329897B (OSRAM)
WO (1) WO1997047663A1 (OSRAM)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882551A (en) * 1995-04-06 1999-03-16 Ferro Corporation Brominated syndiotactic polystyrene and the use thereof
US6518368B2 (en) 1996-06-14 2003-02-11 Albemarle Corporation Brominated polystyrene having improved thermal stability and color and process for the preparation thereof
US5637650A (en) 1996-06-14 1997-06-10 Ferro Corporation Brominated polysytrene having improved thermal stability and color and process for the preparation thereof
US6232408B1 (en) 1996-09-26 2001-05-15 Albemarle Corporation Brominated polstyrenic resins
US6133381A (en) * 1996-09-26 2000-10-17 Albelmarle Corporation Brominated polystyrenic flame retardants
US6235844B1 (en) 1996-09-26 2001-05-22 Albemarle Corporation Brominated polystyrenic resins
US6235831B1 (en) 1996-09-26 2001-05-22 Albemarle Corporation Polymer compositions containing brominated polystyrenic resins
US6232393B1 (en) 1996-09-26 2001-05-15 Albemarle Corporation Polymers flame retarded with brominated polystyrenic resins
DE69701997T2 (de) * 1996-09-26 2000-11-09 Albemarle Corp., Baton Rouge Verfahren zur bromierung von styrolpolymeren
US6521714B2 (en) 1996-09-26 2003-02-18 Albemarle Corporation Brominated polystyrenic resins
US6326439B1 (en) 1996-09-26 2001-12-04 Albemarle Corporation Process for brominating polystyrenic resins
US6221614B1 (en) * 1997-02-21 2001-04-24 The Regents Of The University Of California Removal of prions from blood, plasma and other liquids
US6146555A (en) * 1998-01-19 2000-11-14 Ferro Corporation Brominated copolymer flame retardant additives having improved color characteristics and related method
US6313252B1 (en) 1999-02-04 2001-11-06 The Dow Chemical Company Functionalized ethylene/vinyl or vinylidene aromatic interpolymers
CN100551659C (zh) * 2004-05-20 2009-10-21 雅宝公司 制成粒状的溴化阴离子苯乙烯系聚合物及其制备和应用
US7432332B2 (en) * 2005-03-31 2008-10-07 Albermarle Corporation Polymer halogenation process with catalyst recovery
CN101213220B (zh) * 2005-06-30 2012-05-09 雅宝公司 溴化的苯乙烯系聚合物和其制备
CA2629742C (en) * 2005-12-21 2014-02-18 Albemarle Corporation Brominated anionic styrenic polymers and their preparation
MX2009000535A (es) * 2006-07-20 2009-03-09 Albemarle Corp Tecnologia de proceso para recuperar polimeros estirenicos bromados de mezclas de reaccion en las cuales se forman y/o convertir estas mezclas en pelotillas o granulos o pastillas.
EP2094458A1 (en) * 2006-11-28 2009-09-02 Albemarle Corporation Converting brominated anionic styrenic polymer into harder and larger form for storage, shipment, and use
TR201818474T4 (tr) 2007-06-07 2019-01-21 Albemarle Corp Eklentiler, Eklentiler Ve Oligomerler Veya Eklentiler, Oligomerler Ve Düşük Molekül Ağırlıklı Polimerler Ve Bunların Hazırlanması
US8993684B2 (en) 2008-06-06 2015-03-31 Albemarle Corporation Low molecular weight brominated polymers, processes for their manufacture and their use in thermoplastic formulations
KR101536032B1 (ko) 2008-06-06 2015-07-10 알베마를 코포레이션 저분자량의 브롬화 중합체, 이들의 제조 방법 및 열가소성 배합물에서 이들의 용도
JO3423B1 (ar) * 2008-12-02 2019-10-20 Albemarle Corp مؤخرات لهب معالجة بالبروم و مواد مشتقه منها
CN102272176A (zh) * 2008-12-02 2011-12-07 雅宝公司 支化和星形支化的苯乙烯聚合物、调聚物和加合物，其合成、其溴化及其用途
CN102232089B (zh) * 2008-12-02 2013-11-13 雅宝公司 衍生自甲苯和苯乙烯的调聚物混合物的溴化
US8648140B2 (en) * 2008-12-02 2014-02-11 Albemarle Corporation Toluene and styrene derived telomer distributions and brominated flame retardants produced therefrom
JO3059B1 (ar) 2009-05-01 2017-03-15 Albemarle Corp معالجة بالبروم لتراكيب بوليمرات عطرية ذات وزن جزيئي منخفض
MX2011011302A (es) 2009-05-01 2011-11-18 Albemarle Corp Composiciones granuladas de polimeros aromaticos bromados de bajo peso molecular.
JP5848555B2 (ja) * 2011-09-08 2016-01-27 三菱エンジニアリングプラスチックス株式会社 ポリエステル樹脂組成物及び成形体
JP5848556B2 (ja) * 2011-09-08 2016-01-27 三菱エンジニアリングプラスチックス株式会社 ポリエステル樹脂組成物及び成形体
US11021425B2 (en) 2018-10-12 2021-06-01 International Business Machines Corporation Polybrominated diphenyl-based flame retardant compounds
CN119529143B (zh) * 2025-01-23 2025-04-08 山东东信新材料科技股份有限公司 一种溴化聚苯乙烯的制备方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2370758A1 (fr) * 1976-11-11 1978-06-09 Basf Ag Procede pour la preparation de produits de polymerisation bromes du styrene
FR2413409A1 (fr) * 1978-01-02 1979-07-27 Huels Chemische Werke Ag Procede pour preparer des polystyrenes resistant a la chaleur, bromes sur le noyau
EP0047549A2 (en) * 1980-08-20 1982-03-17 Ferro Corporation Process for the bromination of polystyrenes
EP0201411A2 (en) * 1985-05-03 1986-11-12 The Dow Chemical Company Brominated polymers of alkenyl aromatic compounds
EP0277429A2 (en) * 1987-01-28 1988-08-10 Great Lakes Chemical Corporation Aromatic bromination of polystyrene using bromine as the reaction solvent
US4975496A (en) * 1989-08-10 1990-12-04 The Dow Chemical Company Process for brominating aromatic resins
WO1991013915A1 (en) * 1990-03-16 1991-09-19 Great Lakes Chemical Corporation Process for purifying brominated polystyrene
EP0709398A1 (en) * 1994-10-27 1996-05-01 INDUSTRIE CHIMICHE CAFFARO S.p.A. Process for preparing chlorinated aliphatic polymers
WO1996031578A1 (en) * 1995-04-06 1996-10-10 Ferro Corporation Brominated syndiotactic styrenic polymers and method for making and using same

Family Cites Families (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1890772A (en) 1930-01-28 1932-12-13 Du Pont Chlorination of meta styrene
US2199026A (en) 1937-04-01 1940-04-30 Du Pont Chlorinated aromatic resins
US2823201A (en) 1952-03-10 1958-02-11 Dow Chemical Co Halogenated polymers of nuclear methylated aromatic hydrocarbons, their quaternary ammonium salts and method of making the same
US3009906A (en) 1957-05-09 1961-11-21 Dow Chemical Co Halogenation of solid resinous polymers of alkenylaromatic compounds with gaseous halogens
US3050476A (en) 1958-12-08 1962-08-21 Koppers Co Inc Method of making a self extinguishing expandable polymer of styrene by bromination
US3039977A (en) 1959-12-03 1962-06-19 Koppers Co Inc Method of producing self-extinguishing foamable polystyrene by brominating foamable polystyrene in aqueous suspension
US3132045A (en) 1961-10-26 1964-05-05 Dow Chemical Co Method of impregnating film materials with ammonium bromide
NL128916C (OSRAM) 1965-02-18 1900-01-01
US3506741A (en) 1966-01-10 1970-04-14 Phillips Petroleum Co Halogenated polymers and block copolymers produced therefrom
US3534012A (en) 1969-05-01 1970-10-13 Dow Chemical Co Anionic polymerization of nuclear halogenated styrenes
CH584731A5 (OSRAM) 1973-12-17 1977-02-15 Ciba Geigy Ag
US3959398A (en) 1974-06-03 1976-05-25 The Goodyear Tire & Rubber Company Alpha-methyl-p-bromo-styrene and method of preparation
US4028486A (en) 1974-06-03 1977-06-07 The Goodyear Tire & Rubber Company Alpha-methyl-p-bromo-styrene and method of preparation
US3932542A (en) 1974-08-26 1976-01-13 Great Lakes Chemical Corporation Process for preparation of 2,5-dibromo-p-xylene
US4178327A (en) 1974-12-19 1979-12-11 The Dow Chemical Company Ar-halo-ar(t-alkyl)styrenes and polymers thereof
DE2515473C3 (de) 1975-04-09 1987-01-22 Basf Ag, 6700 Ludwigshafen Flammwidrige, lineare Polyester
CA1054161A (en) 1975-08-22 1979-05-08 Herbert Naarmann Manufacture of heat-stable brominated oligomers of monovinyl-aromatic compounds
DE2645711C3 (de) 1976-10-09 1979-06-07 Basf Ag, 6700 Ludwigshafen Halogenhaltige Flammschutzmittel enthaltende Fasern und Fäden aus linearen, thermoplastischen Polyestern
DE2703419B1 (de) 1977-01-28 1978-02-02 Basf Ag Flammwidrig ausgeruestete polyamid- formmassen
DE3061057D1 (en) 1979-05-07 1982-12-16 Ciba Geigy Ag A process for the preparation of brominated products of polystyrene
DE3006448A1 (de) 1980-02-21 1981-08-27 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von mischungen aus bromierten polystyrolen und bromierten aromatischen verbindungen
DE3025666C2 (de) 1980-07-07 1983-01-20 Chemische Fabrik Kalk GmbH, 5000 Köln Polymeres Pentabromstyrol, Verfahren zur Herstellung und Verwendung
US4389517A (en) 1982-04-02 1983-06-21 The Dow Chemical Company Hydrogenation of phenylacetylene prior to styrene polymerization
US4513116A (en) 1983-04-01 1985-04-23 Exxon Research And Engineering Co. Process for the manufacture of halogenated polymers
US4548995A (en) 1983-04-01 1985-10-22 Exxon Research & Engineering Co. Process for the manufacture of halogenated polymers
US4554326A (en) 1983-04-01 1985-11-19 Exxon Research & Engineering Co. Process for the manufacture of halogenated polymers
US4501859A (en) 1983-04-01 1985-02-26 Exxon Research & Engineering Co. Process for the manufacture of halogenated polymers
JPS6060161A (ja) 1983-08-08 1985-04-06 ザ　ダウ　ケミカル　カンパニ− 重合体の処理中に放出されたハロゲンおよび酸の中和方法
EP0150332A3 (en) 1983-12-26 1987-08-19 Mitsubishi Kasei Corporation Process for producing a chloromethylated polymer
JPS6134723A (ja) 1984-07-26 1986-02-19 Teijin Ltd 磁気記録媒体及びその製造法
US4650832A (en) 1984-09-17 1987-03-17 Exxon Research & Engineering Co. Process for the manufacture of halogenated polymers
IL79499A0 (en) 1986-07-23 1986-10-31 Yeda Res & Dev Production of crystalline tribromostyrene
JP2543510B2 (ja) 1986-12-12 1996-10-16 三菱瓦斯化学株式会社 難燃性ポリアミド樹脂組成物
US4879353A (en) 1987-01-28 1989-11-07 Great Lakes Chemical Corporation Bromination of polystyrene using bromine as the reaction solvent
US4835222A (en) 1987-02-19 1989-05-30 The Dow Chemical Company Alkylation of vinyl aromatic polymer
US4832873A (en) 1987-10-09 1989-05-23 Great Lakes Chemical Corporation Process for producing polybrominated higher alkylbenzenes
JPH02215807A (ja) 1989-02-17 1990-08-28 Nippon Kayaku Co Ltd 臭素化ポリスチレンの製造方法
JPH0320708A (ja) 1989-03-03 1991-01-29 Olympus Optical Co Ltd 自動合焦装置
NL8901054A (nl) 1989-04-27 1990-11-16 Gen Electric Polymeermengsel met polyester, glasvezels, vlamvertragend middel en vulmiddel; daaruit gevormde voorwerpen.
US5112896A (en) 1989-06-06 1992-05-12 Ferro Corporation High-impact polystyrene containing low molecular weight brominated polystyrene
US5112897A (en) 1989-06-06 1992-05-12 Ferro Corporation High impact polystyrene containing low molecular weight brominated polystyrene
US5112898A (en) 1989-06-06 1992-05-12 Ferro Corporation High impact polystyrene containing low molecular weight brominated polystyrene
US5194482A (en) 1990-08-23 1993-03-16 Ferro Corporation Flame retardant resin composition containing styrenic polymers
US5235000A (en) 1990-12-10 1993-08-10 Ethyl Corporation Preparation, storage, and usage of bromine chloride
IL99130A (en) 1991-08-08 1998-04-05 Bromine Compounds Ltd Preparation of tribromo (B) bromoethyl (benzene in a high degree of purity)
JP3020708B2 (ja) 1992-02-07 2000-03-15 帝人株式会社 ポリエチレンテレフタレート樹脂組成物
JP2718851B2 (ja) 1992-04-07 1998-02-25 帝人化成株式会社 ブロモ化スチレンの乳化重合法
US5326837A (en) 1992-11-20 1994-07-05 Mobil Oil Corporation Catalyst systems for syndiospecific polymerization of styrenes
JP3359695B2 (ja) 1993-05-14 2002-12-24 帝人化成株式会社 ポリスチレン臭素化反応溶液の精製方法
JP3359698B2 (ja) 1993-06-15 2002-12-24 帝人化成株式会社 臭素化ポリスチレンの製造方法
US5304618A (en) * 1993-07-22 1994-04-19 Great Lakes Chemical Corporation Polymers of brominated styrene
JP3471086B2 (ja) 1994-08-12 2003-11-25 帝人化成株式会社 臭素化ポリスチレンの製造方法
CA2189325A1 (en) 1995-03-10 1996-09-19 Youichi Ohara Flame-retardant polyethylene terephthalate resin compositions
JPH0977937A (ja) 1995-09-12 1997-03-25 Idemitsu Petrochem Co Ltd プリント配線板用プリプレグ及びプリント配線用基板
US5532322B1 (en) * 1995-09-26 1999-12-07 Manac Inc Process for preparing brominated polystyrene
US5723549A (en) 1996-06-14 1998-03-03 Ferro Corporation Process for the preparation of brominated polystyrene having improved color characteristics
US5637650A (en) 1996-06-14 1997-06-10 Ferro Corporation Brominated polysytrene having improved thermal stability and color and process for the preparation thereof
US5686538A (en) 1996-09-26 1997-11-11 Albemarle Corporation Process for brominating polystyrenic resins
DE69701997T2 (de) 1996-09-26 2000-11-09 Albemarle Corp., Baton Rouge Verfahren zur bromierung von styrolpolymeren
US5677390A (en) 1996-09-26 1997-10-14 Albemarle Corporation Process for brominating polystyrenic resins
US5767203A (en) 1996-09-26 1998-06-16 Albemarle Corporation Process for brominated styrenic polymers
JPH10130325A (ja) 1996-10-31 1998-05-19 Teijin Chem Ltd ハロゲン化されたスチレン重合物の製法
DE69832913T2 (de) 1997-05-07 2006-09-14 Albemarle Corp. Bromierte Polystyrolharze

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2370758A1 (fr) * 1976-11-11 1978-06-09 Basf Ag Procede pour la preparation de produits de polymerisation bromes du styrene
GB1589700A (en) * 1976-11-11 1981-05-20 Basf Ag Manufacture of a brominated polymer of styrene
FR2413409A1 (fr) * 1978-01-02 1979-07-27 Huels Chemische Werke Ag Procede pour preparer des polystyrenes resistant a la chaleur, bromes sur le noyau
GB2013212A (en) * 1978-01-02 1979-08-08 Huels Chemische Werke Ag Process for the manufacture of heatstable nuclear brominated polystyrene
EP0047549A2 (en) * 1980-08-20 1982-03-17 Ferro Corporation Process for the bromination of polystyrenes
EP0201411A2 (en) * 1985-05-03 1986-11-12 The Dow Chemical Company Brominated polymers of alkenyl aromatic compounds
EP0277429A2 (en) * 1987-01-28 1988-08-10 Great Lakes Chemical Corporation Aromatic bromination of polystyrene using bromine as the reaction solvent
US4975496A (en) * 1989-08-10 1990-12-04 The Dow Chemical Company Process for brominating aromatic resins
WO1991013915A1 (en) * 1990-03-16 1991-09-19 Great Lakes Chemical Corporation Process for purifying brominated polystyrene
EP0709398A1 (en) * 1994-10-27 1996-05-01 INDUSTRIE CHIMICHE CAFFARO S.p.A. Process for preparing chlorinated aliphatic polymers
WO1996031578A1 (en) * 1995-04-06 1996-10-10 Ferro Corporation Brominated syndiotactic styrenic polymers and method for making and using same

Also Published As

Publication number Publication date
GB2329897A (en) 1999-04-07
JP2008133484A (ja) 2008-06-12
CA2256530C (en) 2006-09-12
CA2256530A1 (en) 1997-12-18
EP0906345B1 (en) 2005-04-27
GB9827416D0 (en) 1999-02-03
US5726252A (en) 1998-03-10
US5637650A (en) 1997-06-10
AU3154597A (en) 1998-01-07
USRE37902E1 (en) 2002-11-05
EP0906345A1 (en) 1999-04-07
DE69733136T2 (de) 2006-03-02
ATE294191T1 (de) 2005-05-15
JP2000512328A (ja) 2000-09-19
DE69733136D1 (de) 2005-06-02
WO1997047663A1 (en) 1997-12-18

Similar Documents

Publication Publication Date Title
GB2329897B (en) Brominated polystyrene and process for the preparation thereof
IL71731A (en) Bromination process for preparing decabromodiphenyl ether from diphenyl ether
BG106724A (en) Oxyhalogenation process using catalyst having porous rare earth halide support
JPS5777631A (en) Vapor-phase halogenation process
JPS58500200A (ja) 有機ハロゲン化合物を分解するための改良された方法
TR22902A (tr) Etilenin oksi-klorasyon usulue ve oksiklorasyon icin katalitik bilesimler
ATE425994T1 (de) Verfahren zur herstellung von bromiertem polystyrol mit verbessertem farbverhalten
Walling et al. Positive Halogen Compounds. V. t-Butyl Hypobromite and Two New Techniques for Hydrocarbon Bromination1
JPH06104630B2 (ja) アルキル基置換芳香族炭化水素の製造方法
CA2215993A1 (en) Method of producing fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether
US4522952A (en) Process for the fluorination of polymers, and perfluorinated ion exchangers
SE8700973L (sv) Forfarande for framstellning av 1,2-dikloretan genom gasfasklorering av etenhaltiga gaser
US2374923A (en) Manufacture of unsaturated halogenated compounds
Kajigaeshi et al. Bromination and oxidation with benzyltrimethylammonium tribromide
JPS57163327A (en) Isomerizing method of halogenated toluene
EP0400465A3 (de) Fluorhaltige Polycarbosilane und Verfahren zu deren Herstellung
PH26289A (en) A process for the preparation of 4-halo-3-halo-3-oxo-2-alkoxy-iminobutyric esters
JP3247505B2 (ja) ハロゲン化芳香族化合物を分解する方法
US4548686A (en) Selective photochlorination of 1,1-dichloroethane
ES8406407A1 (es) Procedimiento para la preparacion de 1,2-dicloroetano
EP0773207A4 (OSRAM)
US4000204A (en) Process for the purification of vinylidene chloride
GB1500237A (en) Process for the preparation of formaldehyde
EP0096403B1 (en) Selective photochlorination of 1,1-dichloroethane with iodine catalyst
CA2309203A1 (en) Process for the preparation of brominated polystyrene having improved color characteristics

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090530