Epoxy resins and process for making the same
AssigneeDow Global Technologies LLC
InventorsJoseph Gan, Emile C. Trottier
Life of this patent
Estimating the term…
Abstract
A controlled conversion resin having an epoxy functionality of greater than 2 and comprising moieties derived from epoxy resin, dihydric phenol, acid anhydride, or amine. The resin is prepared by reacting an epoxy resin with a dihydric phenol, an acid anhydride, or amine or other branching agent in the presence of a catalyst and terminating the reaction at a point such that the reaction product contains both epoxy and terminal hydroxyl groups.
Claims32
A controlled conversion epoxy resin or CCR resin containing both epoxy and terminal hydroxyl groups and having an epoxy functionality of greater than 2 comprising moieties derived from an epoxy resin and a dihydric phenol, an acid anhydride, or an amine.
A process for preparing a CCR resin having an epoxy functionality of greater than 2 comprising branching an epoxy resin by reacting a liquid epoxy resin and a dihydric phenol with an acid anhydride or an amine in the presence of a catalyst and terminating the reaction at a point such that the reaction product contains both epoxy and terminal hydroxyl groups, the acid anhydride being employed in an amount sufficient to achieve the desired epoxy functionality but insufficient to form gels in the anhydride-modified epoxy resin.
Dependencies are inferred from the claim text.