C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/250, 402/43
C08G 59/68 (2006.01) C08G 59/00 (2006.01) C08G 59/02 (2006.01)
Patent
CA 1273740
ABSTRACT Epoxy resins of increased functionality are prepared by branching the epoxy resin in the presence of a lithium or cesium compound as a branching catalyst until the desired functionality is obtained and thereafter terminating the branching reaction. Since the lithium and cesium compounds are not deactivated by the aliphatic chloride typically found in an epoxy resin, the branching reaction can effectively be conducted even at low concentrations of the lithium or cesium compound. Termination of the branching reaction is conducted by cooling the branching reaction mixture or by the addition of a deactivating agent which stops or effectively reduces the rate of the branching reaction. Due to the low concentration at which the branching catalyst can be employed, the resulting branched epoxy resins can be prepared without visible turbidity. The method of the present invention is useful in effectively and economically preparing branched epoxy resins which can be employed in an epoxy resin formulation useful in a wide variety of end-use applications including those applications where performance at higher temperatures and/or better chemical resistance are required such as in electrical laminates, structural adhesives, potting and molding compounds, civil engineering applications, reinforced plastics and protective coatings as well as maintenance paints. 31,461-F
488775
Helmut Hartel Guenter
Koenig Raymond Alphonse
Smart & Biggar
The Dow Chemical Company
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