Textile substrate with polymer foam coating
View Patent ↗The present invention relates to a process for preparing composite textile and composite textile obtainable by this process as well as the use of said composite textile for automotive applications among other things. Said process comprises the following steps: (a) applying a foamed polymer dispersion onto a suede-like textile substrate; (b) drying the composite material of polymer foam and substrate; (c) compacting the polymer foam with the substrate; and (d) heat-treating and/or cross-linking the polymer foam. The composite textile is characterised by a suede-like textile substrate and a polymer foam layer.
1. A process for preparing a polyurethane-containing composite textile of imitation leather, the process comprising the steps of;
(a) providing a knitted or woven textile substrate having a length and a width;
(b) stretching the knitted or woven textile substrate along its width, the textile substrate having fibers which do not extend in the plane of the textile substrate but stand out at least 45° in relation to said plane, or having a pile, said stretching being effective to increase the width dimension of said substrate by at least 5%;
(c) applying a foamed polyurethane dispersion onto the textile substrate to form a composite material;
(d) drying the composite material, thereby facilitating free shrinkage of the composite material;
(e) compacting the composite material; and
(f) condensing the composite material.
2. A process according to claim 1 , comprising the additional step of applying a polyurethane top coating to the composite material following the compacting step (e).
3. A process according to claim 1 , wherein the textile substrate has a thickness of at least 1 mm.
4. A process according to claim 1 , wherein the textile substrate is a warp-knitted fabric.
5. A process according to claim 1 , wherein the textile substrate is pre-dyed with disperse dyestuffs.
6. A process according to claim 1 , wherein the foamed polyurethane dispersion contains pigment during application.
7. A process according to claim 1 , comprising the additional steps of:
(g) providing a tumble process following condensation; and
(h) applying a top coating or lacquer.
8. A process according to claim 1 , wherein an application of a top coating is placed upon the composite material following the step of condensing the composite material.
9. A process according to claim 8 , wherein the top coating is a lacquer.
10. The process according to claim 8 , wherein the top coating is a polyurethane.
11. The process according to claim 8 , wherein the composite is dried on a tenter after the application of a top coating.
12. The process according to claim 7 , wherein the tumble process comprises mechanical treatment in a tumbler.