GB1347647A - Process for the purification of organic isocyanates - Google Patents

Process for the purification of organic isocyanates

Info

Publication number
GB1347647A
GB1347647A GB1347647DA GB1347647A GB 1347647 A GB1347647 A GB 1347647A GB 1347647D A GB1347647D A GB 1347647DA GB 1347647 A GB1347647 A GB 1347647A
Authority
GB
United Kingdom
Prior art keywords
isocyanate
purification
imidazole
heating
organic isocyanates
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
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of GB1347647A publication Critical patent/GB1347647A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/18—Separation; Purification; Stabilisation; Use of additives
    • C07C263/20—Separation; Purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1347647 Isocyanate purification IMPERIAL CHEMICAL INDUSTRIES Ltd 16 Jan 1973 [13 April 1972] 17067/72 Heading C2C The acidic and hydrolysable chlorine-containing impurity content of an organic isocyanate is reduced by heating the isocyanate with an imidazole. Preferred isocyanates are tolylene diisocyanates and methylene bridged polyphenyl polyisocyanates and preferred imidazoles are imidazole, 4 - methylimidazole, 2,4 - dimethylimidazole, 4,5 - diphenylimidazole and 4,5- benzimidazole. An inert gas stream is preferably passed through the mixture during the heating period.
GB1347647D 1973-01-16 1973-01-16 Process for the purification of organic isocyanates Expired GB1347647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1706772 1973-01-16

Publications (1)

Publication Number Publication Date
GB1347647A true GB1347647A (en) 1974-02-27

Family

ID=10088678

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1347647D Expired GB1347647A (en) 1973-01-16 1973-01-16 Process for the purification of organic isocyanates

Country Status (1)

Country Link
GB (1) GB1347647A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263946A1 (en) * 1986-08-19 1988-04-20 The Dow Chemical Company Method for scavenging acidic impurities from polymeric isocyanates
EP0420026A2 (en) * 1989-09-26 1991-04-03 Air Products And Chemicals, Inc. Preparation of urethane prepolymers having low levels of residual diisocyanate
US6222066B1 (en) 1999-03-30 2001-04-24 Bayer Aktiengesellschaft Process for decreasing the chlorine content of organic isocyanates
US6391161B1 (en) 1999-03-30 2002-05-21 Bayer Aktiengesellschaft Method for reducing the chlorine content of low molecular weight isocyanates
US6395925B1 (en) 1999-05-17 2002-05-28 Bayer Aktiengesellschaft Process for purifying organic isocyanates, the organic isocyanates so purified and their use
US8865620B2 (en) 2007-03-15 2014-10-21 Datalase, Ltd. Heat-sensitive coating compositions based on resorcinyl triazine derivatives
US8900414B2 (en) 2007-11-07 2014-12-02 Datalase, Ltd. Fiber products
US9045619B2 (en) 2007-08-22 2015-06-02 Datalase Ltd. Laser-sensitive coating composition
US9982157B2 (en) 2008-10-27 2018-05-29 Datalase Ltd. Aqueous laser-sensitive composition for marking substrates

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263946A1 (en) * 1986-08-19 1988-04-20 The Dow Chemical Company Method for scavenging acidic impurities from polymeric isocyanates
EP0420026A2 (en) * 1989-09-26 1991-04-03 Air Products And Chemicals, Inc. Preparation of urethane prepolymers having low levels of residual diisocyanate
EP0420026A3 (en) * 1989-09-26 1991-05-08 Air Products And Chemicals, Inc. Preparation of urethane prepolymers having low levels of residual toluene diisocyanate
US6222066B1 (en) 1999-03-30 2001-04-24 Bayer Aktiengesellschaft Process for decreasing the chlorine content of organic isocyanates
US6391161B1 (en) 1999-03-30 2002-05-21 Bayer Aktiengesellschaft Method for reducing the chlorine content of low molecular weight isocyanates
US6395925B1 (en) 1999-05-17 2002-05-28 Bayer Aktiengesellschaft Process for purifying organic isocyanates, the organic isocyanates so purified and their use
US8865620B2 (en) 2007-03-15 2014-10-21 Datalase, Ltd. Heat-sensitive coating compositions based on resorcinyl triazine derivatives
US9045619B2 (en) 2007-08-22 2015-06-02 Datalase Ltd. Laser-sensitive coating composition
US8900414B2 (en) 2007-11-07 2014-12-02 Datalase, Ltd. Fiber products
US9982157B2 (en) 2008-10-27 2018-05-29 Datalase Ltd. Aqueous laser-sensitive composition for marking substrates

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Legal Events

Date Code Title Description
PS Patent sealed