Sheet molding compound and carbon fiber composite material molded article

A method of producing a sheet molding compound comprising:

• preparing a fiber substrate (A) comprising carbon fiber;
• and
• impregnating the fiber substrate (A) with a thermosetting resin composition (B),
• wherein the thermosetting resin composition (B) comprises a vinyl ester resin and a shrinkage reducing agent,
• wherein the shrinkage reducing agent comprises a polyfunctional (meth)acrylate,
• wherein the polyfunctional (meth)acrylate is in liquid state at room temperature, and
• wherein an average fiber length of the carbon fiber is 5 mm or more.

A sheet molding compound comprising:

• a fiber substrate (A) comprising carbon fiber;
• and
• a thermosetting resin composition (B),
• wherein the thermosetting resin composition (B) comprises a vinyl ester resin, a shrinkage reducing agent, an unsaturated polyester resin, a polyisocyanate compound, and a reactive diluent,
• wherein the reactive diluent comprises one or more selected from the group consisting of a vinyl monomer and a monofunctional (meth)acrylate, and
• wherein an average fiber length of the carbon fiber is 5 mm or more.

A method of producing a sheet molding compound comprising:

• preparing a fiber substrate (A) comprising carbon fiber;
• and
• impregnating the fiber substrate (A) with a thermosetting resin composition (B),
• wherein the thermosetting resin composition (B) comprises a vinyl ester resin, a shrinkage reducing agent, an unsaturated polyester resin, a polyisocyanate compound, and a reactive diluent,
• wherein the reactive diluent comprises one or more selected from the group consisting of a vinyl monomer and a monofunctional (meth)acrylate, and
• wherein an average fiber length of the carbon fiber is 5 mm or more.