C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/261, 402/33
C08G 59/02 (2006.01)
Patent
CA 1284696
ABSTRACT A process for the preparation of glycidyl derivatives of compounds containing one or more -OH, NH2 or -COOH group per molecule, which process comprises reacting at least one compound having one or more -OH, -NH2 or -COOH group per molecule with an excess of at least one epihalohydrin in the presence of an alkali metal hydroxide and an organic solvent and continuously removing water from the reaction mixture by codistilling or azeotroping with the eiphalohydrin and solvent; characterized by conducting the reaction in the presence of a mixture of solvents which codistill with the water and epihalohydrin, at least one of which solvents is a polar aprotic solvent and wherein the amount of polar aprotic solvent employed is from 5 to 80 percent by weight of the total amount of solvents employed. Epoxy resins prepared the process of this invention are particularly suitable for use in electrical and electronic applications where the total halogen content needs to be as low as possible.
572493
Liao Zeng-Kun
Wang Chun S.
Smart & Biggar
The Dow Chemical Company
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