The invention pertains to a prepolymer composition comprising a mixture of monomers, oligomers, and polymers obtainable by polymerization of unsaturated monomers consisting of at least one of biscitraconimide, bisitaconimide, and citraconimido-itaconimide, and optionally (co)curable compound selected from bismaleimides, citraconamidomaieimides, and itaconamido maleimides, wherein 5-55 wt.% is monomer, 20-80 wt.% is oligomer having a molecular weight 300 to 3,000, and 10-50 wt.% is polymer having a molecular weight 3,000 to about 80,000, whereas the total content of monomers, oligomers, and polymers in the composition is at least 90 wt.%. The prepolymer can be used for making laminates and prepregs by curing the composition to a polymer.
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