Textile substrates having self-cleaning properties
AssigneeEvonik Degussa GmbH
InventorsVolker Hennige, Christian Hying, Gerhard Hörpel, Markus Oles, Edwin Nun, Bernhard Schleich
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Abstract
The present invention relates to a vapor-pervious water-impervious substrate, preferably a fibrous nonwoven web, which can be used in particular as a textile continuous sheet material, for example as an awning or as an inlet in apparel. The substrate according to the present invention may have self-cleaning properties. The substrate according to the present invention is simple to produce in an at least two-step process wherein a coating on the fibers of the substrate is produced in the first step and then hydrophobic particles are applied to the coated fibers by means of an adhesion promoter.
Claims33
A process for producing a vapor-pervious, water-impervious textile substrate, comprising
- a) treating a substrate with a liquid comprising at least one adhesion promoter to form a liquid treated substrate which, after drying, has fibers coated with a first coating consisting of a hydrolyzed tetraethoxysilane obtained by reacting tetraethoxysilane with an aqueous solution of hydrochloric acid, and at least one first adhesion promoter, wherein the first coating is in direct contact with the fibers and is at least circumferentially continuous;
- and
- b) treating the liquid treated substrate from a) with a mixture comprising hydrophobic particles, a solvent, and at least one adhesion promoter to form the vapor-pervious, water-impervious textile substrate having, on the first coating, a second coating comprising the hydrophobic particles having an average particle size in the range from 0.02 to 100 μm, a hydrolyzed tetraethoxysilane obtained by reacting tetraethoxysilane with an aqueous solution of hydrochloric acid, and at least one second adhesion promoter, where the second coating is at least circumferentially continuous;
- wherein the liquid treated substrate of a) is dried before being treated in b);
- wherein the mixture treated substrate of b) is dried;
- and wherein the at least one adhesion promoter in a) and b) may be the same or different.
A vapor-pervious water-impervious textile substrate, comprising fibers, wherein the fibers comprise, on the surfaces of the fibers, a first coating consisting of a hydrolyzed tetraethoxysilane obtained by reacting tetraethoxysilane with an aqueous solution of hydrochloric acid, and at least one first adhesion promoter, wherein the first coating is in direct contact with the fibers and is at least circumferentially continuous, and a second coating comprising hydrophobic particles having an average particle size in the range from 0.02 to 100 μm, the hydrolyzed tetraethoxysilane obtained by reacting tetraethoxysilane with an aqueous solution of hydrochloric acid, and at least one second adhesion promoter, where the second coating is at least circumferentially continuous.
Dependencies are inferred from the claim text.