A process of forming a resveratrol-based flame retardant small molecule with a phosphonate/phosphinate molecule that includes a chloride group and a terminal functional group.

A compound according to formula (I) can be part of a heat-curable resin composition based on polymaleimide resin systems comprising such compound as co-monomer:

##STR00001##

wherein D is an x-functional group; and x is an integer 2; with the proviso that the x-functional group D is not a polycarbonate with an average molar mass in the range of 15000 g/mol to 150000 g/mol. A crosslinked resin is obtainable by curing such composition. The compounds can be used in structural adhesives, matrix resins for fiber prepregs, moulding compounds, and structural and/or electrical composites.

A compound according to formula (I) can be part of a heat-curable resin composition based on polymaleimide resin systems comprising such compound as co-monomer:

##STR00001##

wherein D is an x-functional group; and x is an integer 2; with the proviso that the x-functional group D is not a polycarbonate with an average molar mass in the range of 15000 g/mol to 150000 g/mol. A crosslinked resin is obtainable by curing such composition. The compounds can be used in structural adhesives, matrix resins for fiber prepregs, moulding compounds, and structural and/or electrical composites.