Fluorine containing organosilicon compounds

Abstract

Addition to organosilicon compounds having at least one alkyl group attached to a silicon atom, at least one hydrogen atom being attached to the carbon atom adjacent the silicon atom, of a fluorocompound, which may be a fluoroolefin.[., a perfluoroketone,.]. or a perfluoroether having a carbon-carbon double bond in α-position to the ether oxygen atom, give fluorine-containing organosilicon compounds. These adducts may be liquid or solid and are useful as (1) lubricants and sealants for automotive and aerospace industries (2) fire-resistant hydraulic fluids, and (3) siloxane elastomers having good oil and lubricant resistance.

What is claimed is: 
     
       1. A fluorine-containing organosilicon compound made by the addition to an organosilicon compound having at least one alkyl group attached to a silicon atom, at least one hydrogen atom being bonded to the carbon atom adjacent the silicon atom, of a fluorocompound selected from the class consisting of the following: (A) fluoroolefins having one of the following formulas (1), (2), and (3): ##STR12## .[.(B) ketones having the following formula (4):.]. ##STR13## and   (C) ethers having the following formula .[.(5).]. .Iadd.(4) .Iaddend. ##STR14## where Each R f  independently is a C 1  -C 8  saturated perfluoroalkyl;   R' f  is Br or R f ,   R" f  is R f  or a radical obtained by removing one fluorine atom from a perfluoroalkyl ether; and   m in formula (3) is an integer of 2 to 12.   
     
     
       2. A compound of claim 1, which is an adduct of a fluorocompound with a linear or cyclic siloxane. 
     
     
       3. A compound of claim 2, wherein the siloxane has the following formula ##STR15## wherein each of R and R' is alkyl; if the siloxane is cyclic, n is 3-6; and if the siloxane is linear, n is 2-10,000 and is represented by the formula ##STR16## 
     
     
       4. A compound of claim 1 which is an adduct of an organosilicon compound with a fluorocompound selected from the group consisting of hexafluoropropene, perfluoromethyl vinyl ether, .[.hexafluoroacetone,.]. and bromotrifluoroethylene.