Process for treating fillers with fluorosilicone compounds

Claim 1

A process for treating fillers with a fluorosilicone-nitrogen polymer comprising contacting a filler having a specific surface area of, approximately, 20 to 800 square meters per gram with a fluorine functional silicon-nitrogen polymer comprising: (1) from 3 to 100 mole percent of chemically combined units selected from the class consisting of: ##STR19## and (2) from 0 to 97 mole percent of chemically combined structural units represented by the formula: ##EQU1## wherein the silicon atoms of said silicon-nitrogen polymer are joined by linkages selected from Si-O-Si linkages and Si-N(R 11 )-Si linkages, wherein the free valences of said silicon atoms other than those required to form siloxy and silazy units are joined to a member selected from an R 11 radical and an (R 11 ) 2 N radical where the ratio of the sum of R 11 radicals and (R 11 ) 2 N radicals to the silicon atoms of said silicon nitrogen polymer has a value of from 1.1 to 3, inclusive, where R f is a fluoroalkyl radical, R 11 is a radical selected from the class consisting of hydrogen and monovalent hydrocarbon radicals, R 111 is a radical selected from the class consisting of hydrogen, fluoroalkyl radicals and monovalent hydrocarbon radicals and c is a whole number equal to 0 to 3, inclusive.