Effect of triorganophosphites on platinum catalyzed curing of silicon rubber Original Research Article

Triorganophosphites containing substituents with different electronic and steric properties have been synthesized and tested as inhibitors of Karstedtʹs catalyst (complex Pt(0) with divinyltetramethyldisiloxane) in cross-linking of silicones via hydrosilylation. Relatively bulky or electron-withdrawing substituents in phosphite appeared to be the most efficient inhibitors of hydrosilylation showing sufficiently long pot-life at room temperature and short curing time at high temperature. New molecular complexes of Pt(DVTMDS)–selected phosphites have been synthesized and characterized. The new complexes proved to be effective catalysts of the curing process. The free phosphites as well as the phosphite–Pt complexes have been found resistant to oxidation and hydrolysis.