モノイソシアネートを尿素に変換するための方法

Title:

モノイソシアネートを尿素に変換するための方法

Document Type and Number:

Japanese Patent JP7443364

Kind Code:

B2

Abstract:

Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.

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WO/2002/059102	UREA DERIVATIVES, METHOD FOR PREPARING SAME, USE THEREOF AS MEDICINES, PHARMACEUTICAL COMPOSITIONS AND USE
JP2000154173	PRODUCTION OF ALKYLATED CYANOACETYLUREA
JPH10509157	INDUSTRIAL APPLICABILITY: Iminooxymethyleneanilide, a method for producing the same, an intermediate product for the same, and a composition containing the same.

Inventors:

Hofner, Jr., Robert E.
Brown, Helge
Clam, Brian
Costa, Armenio

Application Number:

JP2021531307A

Publication Date:

March 05, 2024

Filing Date:

October 31, 2019

Export Citation:

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Assignee:

Dow Global Technologies LLC
Dow Portugal Produtos Kimikos, Sociedato Unipessoal, Eldia

International Classes:

C07C273/18; C07C275/28

Domestic Patent References:

JP63122660A

Other References:

Tetrahedron Letters,1972年,13(11),1065-1068

Attorney, Agent or Firm:

Hiroshi Kobayashi
Eiji Katayama
Norio Omori

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