EMULSIONS AQUEUSES DE SILICONE DONNANT UN ELASTOMERE PAR ELIMINATION DE L'EAU, PROCEDE POUR LEUR PREPARATION, ELASTOMERE OBTENU A PARTIR DE CES EMULSIONS, PROCEDE DE REVETEMENT D'UN SUBSTRAT A L'AIDE DE CES EMULSIONS ET SUBSTRAT REVETU OBTENU

• Main Author: ROBERT DALE JOHNSON, JOHN CARLTON SAAM ET CHRISTINE MARIE SCHMIDT
• Format: Patent
• Language: French
• Published: 14.08.1981
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; ORGANIC MACROMOLECULAR COMPOUNDS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

L'INVENTION SE RAPPORTE AUX SILICONES.ELLE CONCERNE UNE EMULSION DE SILICONE DONNANT UN PRODUIT ELASTOMERE PAR ELIMINATION DE L'EAU DANS LES CONDITIONS AMBIANTES, QUI COMPREND A UN POLYDIORGANOSILOXANE A GROUPES OH TERMINAUX, STABILISE ANIONIQUEMENT, PRESENT SOUS FORME D'UNE EMULSION HUILE-DANS-EAU, B DE LA SILICE AMORPHE, C UN SEL D'ALKYLETAIN, ET D FACULTATIVEMENT UNE CHARGE AUTRE QUE LA SILICE AMORPHE. L'EMULSION A UN PH DE 9 ET AU-DESSUS ET UNE TENEUR EN MATIERES SOLIDES DE MOINS DE 40 EN POIDS.APPLICATION AU TRAITEMENT DE DIVERS SUBSTRATS, TELS QUE BOIS, MACONNERIE, ETOFFES DE FIBRES DE VERRE, ETC. POUR LES PROTEGER DES AGENTS ATMOSPHERIQUES. A silicone emulsion which provides an elastomeric product upon removal of water under ambient conditions comprises (A) 100 parts by weight of an anionically stabilized, hydroxyl endblocked polydiorganosiloxane, present as an oil-in-water emulsion, (B) from 1 to 150 parts by weight of amorphous silica, (C) from 0 to 200 parts by weight of filler other than amorphous silica, and (D) from 0.1 to 1.5 parts by weight of alkyl tin salt, and has a pH of 9 or greater and a solids content of less than 40 percent by weight. It is obtained by (I) emulsifying the diorganosiloxane using an anionic surfactant in water, (II) adding the amorphous silica, any other filler, the alkyl tin salt, and from 0 to 3 parts by weight of an organic amine composed of carbon, hydrogen, and nitrogen atoms, or carbon, hydrogen, nitrogen, and oxygen atoms, said amine being soluble in the amount of water present in the emulsion, and (III) adjusting the pH of the resulting emulsion to 9 or greater, the amount of water in (I) being such that the solids content of the final silicone emulsion is 40 percent by weight or less. Substrates may be treated with these emulsions.