Method for the production of organic carbonates

Details Method for the production of organic carbonates Method for the production of organic carbonates

2004-07-16

2009-10-06

Saeed, Kamal A (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

Reexamination Certificate

active

07598410

ABSTRACT:
The invention relates to a method for the production of monomer organic carbonates from a mixture of organic carbonates and carbamates which are obtained by reacting urea, substituted urea, a salt or ester of carbamide acid or one of the N-substituted derivatives thereof with a polyalkylene glycol, polyester-polyol or a polyether-polyol of general formula (I), wherein R represents a linear or branched alkylene group having 2-12 carbon atoms and n represents a number between 2 and 20, or with a completely or partially hydrolysed polyvinyl alcohol of general formula (II), wherein R′ represents an alkyl group, an aryl group or an acyl group having 1-12 carbon atoms, p and q represent a number between 120, or with mixtures of said compounds in the presence of a catalyst facilitating the separation of ammonia and the ammonia becomes free or the amine is removed from the reaction mixture by means of a strip gas, whereby said mixture is reacted with an alcohol or a phenol whereby monomer carbonates are formed and polymer polyalcohols of formulae (I) or (II) are reformed.

REFERENCES:
patent: 4436668 (1984-03-01), Harder et al.
patent: 5489702 (1996-02-01), Doya et al.
patent: 6031122 (2000-02-01), Mizukani et al.
patent: 0478073 (1992-04-01), None

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