Abstract: Disclosed is a method for extending a shelf life of vinyl ester resin or unsaturated polyester resin during transportation or general storage. The method includes the step of enhancing an oxygen content of the vinyl ester resin or the unsaturated polyester resin, such that the self-polymerization reaction of reactive functional groups having carbon-carbon unsaturated double bonds of the vinyl ester resin or the unsaturated polyester resin can be minimized, so as to slow down occurrence of a gelation phenomenon of the vinyl ester resin or the unsaturated polyester resin in a long-time transportation or storage, and further to decrease a monetary loss.

Abstract: Disclosed is a method for extending a shelf life of vinyl ester resin or unsaturated polyester resin during transportation or general storage. The method includes the step of enhancing an oxygen content of the vinyl ester resin or the unsaturated polyester resin, such that the self-polymerization reaction of reactive functional groups having carbon-carbon unsaturated double bonds of the vinyl ester resin or the unsaturated polyester resin can be minimized, so as to slow down occurrence of a gelation phenomenon of the vinyl ester resin or the unsaturated polyester resin in a long-time transportation or storage, and further to decrease a monetary loss.

Abstract: A resin composition for composite material parts includes a main agent composed of an epoxy resin and a reactive diluent, and a curing agent. The reactive diluent, which is monomer or oligomer of acrylate or methacrylate having one or more vinyl (unsaturated double bond) functional groups and has low viscosity at room temperature, is used in an amount of 5 to 30 parts by weight based on 100 parts by weight of the main agent such that the main agent has a viscosity of 700 to 3000 cps at 25° C. The resin composition of the present invention is very suitable for being used to manufacture composite material parts used in wind blade, boat, automobile and aircraft by the manufacturing process such as vacuum infusion and hand lay-up vacuum assisted resin infusion process.

Abstract: A vinyl ester resin derived from the reaction of about equivalent amounts of an unsaturated monocarboxylic acid and a polyepoxide is stabilized with from 0.01 to 5 weight percent of maleic acid and/or maleic anhydride.