Process and composition for rendering surfaces hydrophobic and oleophobic

A process for imparting hydrophobic and oleophobic properties to surfaces of bricks or tiles consisting of an inorganic material having open pores, which comprises applying to the surface component (a) which is selected from the class consisting of a fluorine-containing organic polymer and a water soluble polymer of an unsaturated carboxylic acid and a diluent, and component (b) which is a solution of an organosilicon compound having an average of from 0.9 to 1.8 hydrocarbon radicals per silicon atom and any unsatisfied silicon valences are satisfied by an oxygen atom, said organosilicon compound is selected from the group consisting of (i) monomeric hydrocarbon siliconates of the formula

• RSi(OR).sub.2 OM,
• and
• polymeric siliconates thereof having units of the formula ##STR3## (ii) organosilanes of the formula
• R.sup.1.sub.n Si(OR.sup.2).sub.4-n,
• and partial hydrolyzates thereof having not more than 10 silicon atoms per molecule, (iii) an organopolysiloxane containing more than 10 carbon atoms per molecule and consisting of units of the formula ##EQU1## (iv) a product obtained from the reaction of a silane having the formula
• R.sup.1.sub.n SiCl.sub.4-n
• and a glycol selected from the class consisting of ethylene glycol and diethylene glycol, in which M is an alkali metal, R is selected from the class consisting of an alkyl radical having up to 5 carbon atoms and a phenyl radical, R.sup.1 is a hydrocarbon radical free of aliphatic unsatruation having up to 14 carbon atoms, R.sup.2 is an alkyl radical having up to 5 carbon atoms which may be interrupted by ether oxygen, n represents 1, 2 or 3 and has an average of from 0.9 to 1.8, x, y and z represent 0, 1, 2 or 3, the sum of x+y+z is up to 3, with the average value of x being 0.9 to 1.8 and the average values of y and z is from 0.00 to 0.20 except that at least one y and z has an average value of at least 0.01.