A process for preparation of an aromatic n-glycidylamine

a technology of nglycidylamine and glycidylamine, which is applied in the field of preparation of aromatic nglycidylamine, can solve the problems of adversely affecting the properties of cured resins, unsuitable for industrial production of aromatic n, etc., and achieve the effect of facilitating dehydrochlorination

Active Publication Date: 2019-01-31
GRASIM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent describes a process for making an aromatic N-glycidylamine. This is done by heating a mixture of an amine and epichlorohydrin in the presence of a catalyst in an organic solvent at a certain pressure. A base is then added to facilitate the dehydrochlorination of the product to obtain the desired amine. This process is efficient and produces high yields of the desired product.

Problems solved by technology

However, the disclosed process uses sodium flakes and is exothermic in nature and therefore not suitable for industrial production of the aromatic N-glycidylamine.
Further, the conventionally known processes for preparation of the aromatic N-glycidylamine either provide a highly viscous product or require long reaction time and / or high reaction temperature conditions and / or use solvents for the catalysts that require specific safety measures.
However, the use of the inert or reactive diluents can adversely affect the properties of a cured resin.
Further, if inert diluents are used then the same are required to be removed completely before curing due to their flammability or toxicity.

Method used

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Examples

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examples

[0025]Example 1: Bis(4-aminophenyl) methane, toluene and 50% lanthanum nitrate in 2-butoxyethanol are stirred and heated to 60 to 70° C. under a reduced pressure (200-400 mbar) followed by addition of epichlorohydrin over a period of 2 to 5 hours. After completion of epichlorohydrin addition, the mixture is maintained at 60 to 70° C. and then vacuum is released. A further portion of catalyst solution is added and the temperature is raised to 75 to 85° C. under reduced pressure. The mixture is then maintained under this condition for about 3 to 5 hours under constant stirring. The temperature is reduced to 60 to 70° C. and 50% aqueous benzyltrimethylammonium chloride is then added and the apparatus is set up for vacuum azeotrope. 50% aqueous sodium hydroxide is then added over a period of 1 to 3 hours, water being azeotroped out under vacuum (200-500 mbar). At the end of addition, azeotrope is continued for a further of 2 to 3 hours. Toluene and water are then added with stirring and...

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Abstract

A process for preparing an aromatic N-glycidylamine comprising a step of heating a mixture of an amine having at least one aromatic aminohydrogen atom with at least 0.7 equivalent of epichlorohydrin per aminohydrogen equivalent of the amine in presence of a catalyst dissolved in an inert organic solvent, at a pressure in a range of 200 mbar to 600 mbar; and adding a base to the mixture at a pressure in a range of 200 mbar to 600 mbar to facilitate dehydrochlorination of product of the previous step to obtain the aromatic N-glycidylamine.

Description

FIELD OF INVENTION[0001]The present disclosure provides a process for preparation of N-glycidyl compounds. Particularly, the present disclosure provides a process for preparation of an aromatic N-glycidylamine.BACKGROUND[0002]Epoxy resins are suitable for a wide range of applications in industry as coatings, adhesives, encapsulants, moldings, laminates, castings, electrical insulation, weatherable coatings, sealants, impregnants, plasticizers, fibers, foams, and the like. Commonly used epoxy resin in such industries is diglycidyl ether of bisphenol. Epoxy resins having glycidyl groups linked to aromatic amino groups, for example, N,N,N′,N′-Tetraglycidyl-4,4′-Diaminodiphenylmethane (TGDDM) are preferred in industries which require good performance at high temperatures such as aerospace industry. Such compounds are usually prepared by reacting an amine which contains at least one aromatic aminohydrogen atom with about 0.8 to 10 equivalents of epichlorohydrin per aminohydrogen atom, fo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D301/27C07D303/36C07D301/32
CPCC07D301/27C07D303/36C07D301/32
Inventor SINGH, ASHOK KUMARSAMANT, PRASHANTLALANI, ALIFKATHALEWAR, MUKESHMORE, VISHNU
Owner GRASIM IND LTD
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