US 9,067,383 B2 · Flexible and rollable cementitious membrane and method of manufacturing it

Abstract

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 ⅛″ 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.

Claims11

Dependent claims

A flexible membrane in rolled form comprising:

a basemat in rolled form having at least three plies comprising a center ply of a meltblown polymer and two outer plies of spunbond polymer, wherein said center ply is impervious to a hydraulic composition slurry comprising, by weight percent, 66.8% Class C fly ash, 32.8% acrylic polymer latex, 0.30% polycarboxylate superplasticizer, and 0.13% colorant;
and
a set and dried flexible coating on one side of said basemat, said coating comprising:
40% to 80% of a hydraulic component comprising about 62% to about 67% Class C fly ash by weight;
and
about 15% to about 35% of a water-soluble, film-forming acrylic polymer on a dry solids basis, wherein said coating is characterized by having a set and dry time of approximately 10 minutes in a 175° F. (80° C.) oven and wherein said coating is obtained by drying the flexible membrane in an oven;
wherein said membrane is less than 3 mm thick and is rollable into a cylinder.

4 more elements

Dependencies are inferred from the claim text.

Flexible and rollable cementitious membrane and method of manufacturing it

Life of this patent

Flexible and rollable cementitious membrane and method of manufacturing it

Life of this patent

Abstract

Claims11