Patent ID: 7666955

Claim:
A method for producing a branched-polyether resin composition, comprising: a first step of conducting a reaction within a mixture comprising: (1-1) a diacrylate (A2) of an aromatic difunctional epoxy resin, (1-2) (1-2-1) a monoacrylate (A1) of an aromatic difunctional epoxy resin, and, optionally, (1-2-2) an aromatic difunctional epoxy resin (B) other than said (A1) and said (A2), and (1-3) a phosphorus-based catalyst (C), either between a hydroxyl group and an acryloyl group within said diacrylate (A2) of an aromatic difunctional epoxy resin, or between a hydroxyl group and an acryloyl group within said diacrylate (A2) of an aromatic difunctional epoxy resin and said monoacrylate (A1) of an aromatic difunctional epoxy resin, thereby obtaining a reaction mixture comprising: (1-A) a branched-polyether resin (X) containing a hydroxyl group, an acryloyl group and an epoxy group, and (1-B) at least one resin component selected from the group consisting of (1-B-1) a diacrylate (A2) of an aromatic difunctional epoxy resin, (1-B-2) a monoacrylate (A1) of an aromatic difunctional epoxy resin, and (1-B-3) an aromatic difunctional epoxy resin (B) other than said (A1) and said (A2); and a second step of mixing said reaction mixture and an unsaturated monocarboxylic acid, and reacting an epoxy group in said reaction mixture with a carboxyl group in said unsaturated monocarboxylic acid thereby yielding a branched polyether resin (Y) containing a hydroxyl group and an acryloyl group-containing unsaturated monocarboxylate ester structure, such that the method forms a branched polyether resin composition (II) containing the branched polyether (Y) and a di(unsaturated monocarboxylate) ester of an aromatic difunctional epoxy resin.