Aqueous silicone dispersion, crosslinkable into transparent...

Details Aqueous silicone dispersion, crosslinkable into transparent... Aqueous silicone dispersion, crosslinkable into transparent...

C - Chemistry, Metallurgy

08

J

C08J 3/03 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2335720

The invention concerns silicone compositions capable of being hardened by cross-linking and used, in particular as sealant or waterproofing and/or fireproofing and/or jointing coats. In particular, the invention concerns an aqueous silicone dispersion crosslinkable into a transparent elastomer, comprising: (i) a silicone phase phi s with refractive index ns and comprising: at least one crosslinkable polyorganosiloxane (POS) A; optionally at least a silicon-containing adhesion promoter B; optionally at least a crosslinking agent D; provided that at least one of the constituents A, B, D of phi bears at least three functions of molecular crosslinking; and optionally at least one solvent Sa of the POS A silicone(s); (ii) a non-silicon hydrophilic phase phi H, with refractive index nH and comprising at least a CH filler, a surfactant TA and, optionally, at least a catalyst and/or at least a water-soluble adhesion promoter B'; (iii) and water. The invention is characterised in that: | ns- nH | </= 0.05 preferably, | ns nH | </= 0.04. The invention also concerns the method for preparing said dispersion, and the sealant or other materials or waterproofing/fireproofing coats comprising said dispersion.

L'invention concerne les compositions silicones durcissables par réticulation et utilisables, notamment comme mastics ou revêtements d'étanchéification et/ou d'hydrofugation et/ou de jointoiement. Ce but est atteint par l'invention qui concerne une dispersion silicone aqueuse réticulable en un élastomère transparent, du type de celles comprenant: (i) une phase silicone .phi.s d'indice de réfraction n s et comprenant: su moins un polyorganosiloxane (POS) A réticulable éventuellement au moins un promoteur d'adhérence B silicié, éventuellement au moins un réticulant D, avec la condition selon laquelle au moins l'un des constituants A, B, D de .phi.s est porteur d'au moins trois fonctions de réticulation par molécule, et éventuellement au moins un solvant S a du POS A silicone(s), (ii) une phase hydrophile .phi.H non-silicone, d'indice de réfraction n H et comprenant au moins une charge CH, un tensioactif TA et, éventuellement, au moins un catalyseur et/ou au moins un promoteur d'adhérence B' hydrosoluble, (iii) et de l'eau, caractérisée en ce que: ¦ n s - n H ¦ <= 0,05 de préférence, ¦ n s - n H ¦ <= 0,04. L'invention vise, également, le procédé de préparation de cette dispersion, ainsi que les mastics ou autres matériaux ou revêtements d'étanchéification/hydrofugation comprenant cette dispersion.

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