Patent ID: 7935386

Claim:
Process for increasing the fraying resistance of a fibrous substrate comprising the following steps: preparation of an improved aqueous polyorganosiloxane (POS) emulsion, crosslinkable to an elastomer by means of polyaddition reactions, said emulsion comprising: (A) at least one POS having at least two unsaturated functional groups of the C 2 -C 6 alkenyl type bonded to the silicon in each molecule, (B) at least one POS having at least three hydrogen atoms bonded to the silicon in each molecule, (C) at least one special adhesion promoter, (D) at least one catalyst, (E) at least one surfactant, (F) optionally at least one POS resin containing at least two alkenyl groups, (G) optionally at least one crosslinking inhibitor, (H) optionally at least one pH fixing agent, (I) optionally at least one formulating additive, (J) optionally a filler, (K) and water, the improvement consisting in: selecting the adhesion promoter (C) from the group consisting of hydroxylated silanes and POS, either of which carries at least one hydroxyl group and at least one salified amino group per molecule, selecting a percentage by weight of the adhesion promoter (C), based on the silicone phase, such that 0.05≦(C)≦4.0 deposition on said fibrous substrate of at least one layer of the aqueous polyorganosiloxane (POS) emulsion; crosslinking to give a fibrous substrate coated with a layer of elastomer in such a way that the ratio of the dry weight of the coating to the weight of the fibrous substrate is less than 0.2.