Monodispersed glycol suspension of fine inorganic oxide particles having excellent dispersion stability and method of improving the slipperiness of polyester film using the monodispersed suspension

摘要

Monodispersed glycol suspension comprises a suspension of spherical fine particles of an amorphous inorganic oxide (I) in a glycol (II). (I) has ave. particle dia. 0.05-5 micro.m., and relative particle size standard deviation 1-1.5, and contains the glycol (II) bonded to the surface. Oxide particles pref. contain 0.003-5 mmol (II)/g; and have relative particle size standard deviation 1-1.3. The prefd. (I) include SiO2, TiO2, Al2O3, ZrO2 or a cpd. oxide. Prefd. (II) contains 2-8C, and have 2 OH gps.; the esp. prefd. (II) is ethylene glycol. Suspension is pred. by: (a) hydrolysis of an appropriate organometallic cpd. (esp. metal alkoxide or deriv.) in an aq. alcohl (III) opt. contg. (II), (III) of lower b.pt. than (II); (b) opt. addn. of a coupling agent (silane-, titanate-, or aluminate-type); (c) substitution of (II) for the solvent (III), pref. by distn. of (III); and (d) heating of the resulting glycol suspns. at pref. T deg.C.