METHOD OF HARDENING THERMOREACTIVE POLYORGANOSILOXANE RESINS Russian patent published in 1995 - IPC

FIELD: polymeric compounds. SUBSTANCE: method involves heating thermoreactive polyorganosiloxane resins in the presence of organoelemental chelate compounds of transient metals of the general formula MLn where M atom Cu, Ni, Co, Mn, Fe, Cr, V O; L organoelemental ligand a residue of dialkyldithiophosphoric acid of the formula (RO)₂P(S)S- where R monovalent hydrocarbon substituent C₁-C₄, or ferrocenyl-(o-carboxyphenyl)-carboxylic acid C₁₀H₉FeCOC₆H₄COO-; n 1-3, or binary mixture of dialkyldithiophosphates and ferrocenyl-(o-carboxyphenyl)-carboxylates of transient metals at their mole ratio (1: 9)-(9:1). Quantity of these compounds is 0.01-0.5% of resin mass. Gelatinization time is 3-64 min, working life is 6-12 months, resin thermostability is 400 C and above. Method is used in electroengineering and radioengineering. EFFECT: improved method of resin hardening. 2 tbl