Abstract: A curable silicone composition comprising;(a) an organopolysiloxane having at least two silicon-bonded C.sub.2 to C.sub.8 alkenyl groups and containing a particular silicon-bonded fluorine-containing substituent;(b) an organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms and a particular silicon-bonded fluorine-containing substituent; and(c) a catalyst; the proportion of said silicon-bonded hydrogen atoms in Component (b) to said silicon-bonded alkenyl groups in Component (a) being at least 0.5. This composition can form a film, on various substrates, having good release properties, water repellency and oil repellency.

Abstract: An organosilicon compound represented by general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and each represent an alkyl group having 1 to 4 carbon atoms; R.sub.f represents --C.sub.1 F.sub.2l+1 where l represents an integer of 3 to 10, ##STR2## where q represents an integer of 1 to 5, or ##STR3## where q is as defined above; and X represents --O-- or --CH.sub.2 --; provided that n is 3 and m is an integer of 0 to 2 when X represents --O--, and n is 0 and m is 1 when X represents --CH.sub.2 --. The compound is useful for preparing silicone polymers having a high thermal resistance, chemical resistance and weathering resistance and have a small surface energy.

Abstract: Organopolysiloxane compositions are provided which are curable by condensation reaction taking place between a first component, hydroxy-terminated diorganopolysiloxane and a second component, organohydrogenpolysiloxane by aid of a third component, a condensation catalyst, and which are made to have their pot life extended by adding a fourth component, acyloxysilane, optionally in combination with a carboxylic acid, as a condensation retarder. The addition of the retarder does not adversely effect the curing velocity of the composition even at an elevated temperature and the properties of the cured composition.