Rhone-Poulenc Specialites Chimiques

Parasko Nicou

Alain Fau

Solventless organopolysiloxane compositions are well adopted as coating/impregnating materials for a wide variety of substrates to provide, e.g., water repellant/solvent resistant gaskets and various substrates possessing enhanced non-stick characteristics, are comprised of (i) an .alpha.,.omega.-dihydroxypolydiorganopolysiloxane having a viscosity, measured at 25.degree. C., ranging from 5 to 100,000 mPa.s and consisting essentially of recurring units of the formula Z.sub.2 SiO (ii) a polyorganopolysiloxane having from 1.60 to 1.90 organic radicals per silicon atom, having a viscosity ranging from 30 mPa.s at 25.degree. C. to 3,000 mPa.s at 25.degree. C., having from 0.2 to 10% of hydroxyl groups and consisting essentially of the recurring units RSiO.sub.1.5, R.sub.2 SiO and R.sub.3 SiO.sub.0.5 (iii) a crosslinking agent containing a polyalkoxysilyl group; and (iv) a catalytically effective amount of an organic iron or zirconium catalyst soluble in the organopolysiloxane medium.

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Parasko Nicou