GB1263439A - A process for the production of isocyanates - Google Patents

A process for the production of isocyanates

Info

Publication number
GB1263439A
GB1263439A GB2103570A GB2103570A GB1263439A GB 1263439 A GB1263439 A GB 1263439A GB 2103570 A GB2103570 A GB 2103570A GB 2103570 A GB2103570 A GB 2103570A GB 1263439 A GB1263439 A GB 1263439A
Authority
GB
United Kingdom
Prior art keywords
fraction
mdi
ratio
isocyanatophenylmethyl
polymethylene
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
Application number
GB2103570A
Inventor
Peter Fischer
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of GB1263439A publication Critical patent/GB1263439A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/10—Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene

Abstract

1,263,439. Polyphenyl-polymethylene-polyisocyanates. FARBENFABRIKEN BAYERA.G. 1 May, 1970 [7 May, 1969], No. 21035/70. Heading C2C. The invention comprises (1) a poly-/diisocyanate composition, I, in which the ratio between the concentrations of 2,4<SP>1</SP>-diphenylmethane diisocyanate (2,4<SP>1</SP>-MDI) and 4,4<SP>1</SP>-MDI is a, the ratio between the concentrations of 1-(4-isocyanatophenylmethyl) - 3 - (2 - isocyanatophenylmethyl)-4-isocyanatobenzene and 1,3- di - (4 - isocyanatophenylmethyl) - 4 - isocyanato benzene is b and the ratio a : b is greater than 1À3, (2) a process for the production both of pure 4,4<SP>1</SP>- MDI and a polyphenyl-polymethylene-polyisocyanate mixture which comprises separating the polyisocyanate mixture, obtained by phosgenation of an aniline-formaldehyde condensation mixture, by fractional distillation into a fraction A which consists mainly of isomeric MDI and a fraction B which, in addition to isomeric diphenyl diisocyanates consists of polyisocyanates containing more than two aromatic nuclei, and in which fraction A is then separated by fractional distillation into a fraction C consisting of 2,2<SP>1</SP>-, 2,41- and 4,4<SP>1</SP>-MDI, a fraction D consisting of at least 98 weight per cent pure 4,4<SP>1</SP>-MDI and a residue E formed as a result of high temperature polymerization. The composition, I, may be formed by the above process and is the fraction B either alone or to which has been added fraction C to adjust the ratio a : b to the correct value.
GB2103570A 1969-05-07 1970-05-01 A process for the production of isocyanates Expired GB1263439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691923214 DE1923214B2 (en) 1969-05-07 1969-05-07 PROCESS FOR THE SIMULTANEOUS PREPARATION OF PURE 4,4'-DIPHENYLMETHANE DIISOCYANATE AND A POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE MIXTURE, POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE, AND THE USE OF POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE

Publications (1)

Publication Number Publication Date
GB1263439A true GB1263439A (en) 1972-02-09

Family

ID=5733446

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2103570A Expired GB1263439A (en) 1969-05-07 1970-05-01 A process for the production of isocyanates

Country Status (6)

Country Link
JP (1) JPS4948313B1 (en)
BE (1) BE750080A (en)
DE (1) DE1923214B2 (en)
FR (1) FR2047415A5 (en)
GB (1) GB1263439A (en)
NL (1) NL7006542A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49134660A (en) * 1973-02-20 1974-12-25
US4118410A (en) 1971-02-04 1978-10-03 Gottfried Reuter Gmbh I.L. Polyphenyl-polymethylene-polyisocyanate mixtures
US4414074A (en) 1981-11-12 1983-11-08 Bayer Aktiengesellschaft Process for the purification of 4,4'-diisocyanatodiphenylmethane by plural distillations
EP1518874A1 (en) * 2003-09-24 2005-03-30 Basf Aktiengesellschaft Polymeric MDI having low monomer content
CN100434417C (en) * 2004-02-04 2008-11-19 拜尔材料科学股份公司 Process for the production of very pure 2,4' -methylenediphenyl diisocyanate
US9481776B2 (en) 2010-12-15 2016-11-01 Covestro Deutschland Ag Foams of high thermal stability
US9593075B2 (en) 2012-03-19 2017-03-14 Covestro Deutschland Ag Method for producing isocyanates

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105193C3 (en) * 1971-02-04 1981-07-09 Chemie-Anlagenbau Bischofsheim GmbH, 4500 Osnabrück Process for the separation of an organic polyisocyanate mixture
JPS5262937A (en) * 1975-11-19 1977-05-24 Nishikawa Gomu Kougiyou Kk Method of waterrproof gutter construction of concrete joint and waterrproof gutter
DE2623401C3 (en) * 1976-05-25 1981-07-16 Bayer Ag, 5090 Leverkusen Process for the solvent-free production of solid plastic molded parts
DE102005055189A1 (en) * 2005-11-19 2007-05-24 Bayer Materialscience Ag Process for the preparation of 4,4'-diphenylmethane diisocyanate
JP6046043B2 (en) 2010-11-17 2016-12-14 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ Process for refining a mixture comprising 4,4'-methylenediphenyl diisocyanate
WO2012065927A1 (en) 2010-11-17 2012-05-24 Basf Se Process for preparing methylene diphenyl diisocyanate
US8907124B2 (en) 2010-11-17 2014-12-09 Basf Se Process for preparing methylenedi(phenyl isocyanate)
KR101903205B1 (en) 2010-11-17 2018-10-01 바스프 에스이 Method for purifying mixtures comprising 4,4'-methylenediphenyl diisocyanate
US9505711B2 (en) 2010-11-17 2016-11-29 Basf Se Method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate
CN103619927A (en) 2011-05-02 2014-03-05 拜耳知识产权有限责任公司 High-temperature-resistant foams having low thermal conductivity
WO2022106716A1 (en) 2020-11-23 2022-05-27 Basf Se Process for producing isocyanates
CN115354505B (en) * 2022-08-22 2024-03-08 浙江理工大学绍兴柯桥研究院有限公司 Bio-based solvent-free polyurethane surface layer resin for synthetic leather and preparation method thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118410A (en) 1971-02-04 1978-10-03 Gottfried Reuter Gmbh I.L. Polyphenyl-polymethylene-polyisocyanate mixtures
JPS49134660A (en) * 1973-02-20 1974-12-25
JPS524548B2 (en) * 1973-02-20 1977-02-04
US4414074A (en) 1981-11-12 1983-11-08 Bayer Aktiengesellschaft Process for the purification of 4,4'-diisocyanatodiphenylmethane by plural distillations
EP1518874A1 (en) * 2003-09-24 2005-03-30 Basf Aktiengesellschaft Polymeric MDI having low monomer content
CN100434417C (en) * 2004-02-04 2008-11-19 拜尔材料科学股份公司 Process for the production of very pure 2,4' -methylenediphenyl diisocyanate
US7495124B2 (en) 2004-02-04 2009-02-24 Bayer Materialscience Ag Process for the production of very pure 2,4′-methylenediphenyl diisocyanate
US9481776B2 (en) 2010-12-15 2016-11-01 Covestro Deutschland Ag Foams of high thermal stability
US9593075B2 (en) 2012-03-19 2017-03-14 Covestro Deutschland Ag Method for producing isocyanates
US9695115B2 (en) 2012-03-19 2017-07-04 Covestro Deutschland Ag Method for producing isocyanates

Also Published As

Publication number Publication date
NL7006542A (en) 1970-11-10
DE1923214A1 (en) 1970-11-19
BE750080A (en) 1970-10-16
JPS4948313B1 (en) 1974-12-20
DE1923214B2 (en) 1973-08-02
FR2047415A5 (en) 1971-03-12

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414A Case decided by the comptroller ** specification amended (sect. 14/1949)
49R Reference inserted (sect. 9/1949)
SPA Amended specification published
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee