"A method of producing a triacrylate or trimethacrylate of the general formula ##STR9## wherein R1, R2 and R3 are the same or different and each is a hydrogen atom or a methyl group, which comprises reacting 1,1,7-trimethylolheptane with an acrylic or methacrylic acid or an ester-forming derivative thereof." . . . . . . . . .