The present invention relates to the use, as antiadhesive agents and/or water repellents, of grafted functionalized polyorganosiloxanes consisting of grafted copolymer moieties, derived from at least one ethylenically unsaturated monomer which may be polymerized via a radical route and from a functionalized polyorganosiloxane (I) containing similar or different moieties (I) of formula (I) R.sub.a Y.sub.b X.sub.c Si O.sub.(4-a-b-c)/2 (I) in which formula: R=C.sub.1 -C.sub.18 alkyl, X=C.sub.1 -C.sub.20 alkylated epoxyfunctional residue, Y=acrylate, and a, b, c=0, 1, 2 or 3 with a +b+c=0, 1, 2 or 3. These grafted functionalized POSs are used in the form of an aqueous dispersion for the production of an antiadhesive coating on a solid support, preferably chosen from sheets of polymer material or of paper, cardboard or the like, from tapes which are adhesive on their non-adhesive side, from intercalating films of double-sided adhesive tapes or from woven or nonwoven fibrous supports and/or composites or non-composites.