Flexible and rollable cementitious membrane and method of...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 14/18 (2006.01)

Patent

CA 2578056

In a preferred embodiment, a membrane for use as an underlayment includes a basemat, which includes at least three plies, a ply of a meltblown polymer sandwiched between two plies of spunbond polymer; and a flexible coating applied to the basemat, the coating having a cementitious hydraulic component, a polymer comprising a water-soluble, film-forming polymer; and water. The finished membrane is flexible. Another embodiment for an underlayment for use underneath ceramic tiles includes a basemat and a coating of a set hydraulic component less than 1/8" inches thick. A method of making the flexible membrane includes assembling components including a hydraulic component, a water-soluble, film-forming polymer and water, then mixing them to form a coating. A basemat is provided onto which the coating is applied over a flexible surface or no surface. After coating at least one face of the basemat, the coating is dried to form the membrane.

Dans un mode de réalisation préféré, l'invention concerne un revêtement d'étanchéité utilisé comme sous couche, comprenant un mat de base formé d'au moins trois plis, un pli polymère de fusion soufflage pris en sandwich en deux plis polymères filés liés; et un revêtement souple appliqué sur le mat de base, ledit revêtement comprenant un composant hydraulique à base de ciment, un polymère soluble dans l'eau formant un film; et de l'eau. Le revêtement d'étanchéité terminé est souple. Dans un autre mode de réalisation, la sous couche utilisée sous les carreaux de céramique comprend un mat de base et un revêtement de composant hydraulique séché dont l'épaisseur est inférieure à 1/8" de pouce. L'invention concerne également un procédé permettant de produire un revêtement d'étanchéité souple, qui consiste à assembler des composants comprenant un composant hydraulique, un polymère soluble dans l'eau formant un film, et de l'eau; et à les mélanger afin de former un revêtement. Un mat de base doté d'une surface souple sur laquelle un revêtement est appliqué, ou un mat de base sur lequel ledit revêtent est directement appliqué est prévu. Après, le revêtement d'au moins une face du mat de base, ledit revêtement est séché afin de former un revêtement d'étanchéité.

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