Back to results
US 4,544,731 AGranted
Method for preparing advanced epoxy resins
AssigneeThe Dow Chemical Company
InventorsMichael B. Cavitt, David J. Duncan
Life of this patent
Estimating the term…
Abstract
The increase in hydrolyzable halide content in the preparation of advanced epoxy resins is decreased by conducting the advancement in the presence of an unsaturated organic compound.
Claims12
In a process for preparing relatively high molecular weight epoxy resins by reacting at least one relatively low molecular weight epoxy resin with at least one polyhydric phenolic compound in the presence of a suitable advancement catalyst;
- the improvement which comprises also conducting the reaction in the presence of an effective quantity of at least one organic unsaturated compound so as to reduce the hydrolyzable halide content in the resultant relatively high molecular weight epoxy resin and/or prevent increases in the EEW of the advanced epoxy resin while held at elevated temperatures.
Dependencies are inferred from the claim text.