| 摘要 |
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 DEG C., ranging from 5 to 100,000 mPa.s and consisting essentially of recurring units of the formula Z2SiO (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 DEG C. to 3,000 mPa.s at 25 DEG C., having from 0.2 to 10% of hydroxyl groups and consisting essentially of the recurring units RSiO1.5, R2SiO and R3SiO0.5 (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. |
