C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/267
C08G 59/42 (2006.01) C07F 9/54 (2006.01) C08G 59/16 (2006.01) C08G 59/68 (2006.01)
Patent
CA 1041696
ABSTRACT The reaction between vicinal epoxides and a carboxylic acid or anhydrides is well known. Such reactions require a catalyst. Attempts have been made to market precatalysed epoxide mixtures for use in the formation of epoxide resins. These attempts have generally been un- successful due to the catalyst going off, causing unreliable colour, and being corrosive. The present invention seeks to overcome this drawback by providing the process of reacting (a) a vicinal epoxide, particularly an epoxy resin, with (b) a carboxylic acid, a carboxylic acid anhydride, or a mixture thereof, in presence, as catalyst, of triphenyl(2,5-dihydroxy- phenyl)-phosphonium hydroxide inner salt. The invention further provides a composition containing an epoxy resin, the phosphonium inner salt catalyst and a carboxylic acid, anhydride, or mixture thereof.
227514
Doorakian George A.
Duquette Lawrence G.
Na
The Dow Chemical Company
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