Highly flexible sheet composite material
The invention relates to a highly flexible sheet composite material comprising a block flexible foam and a layer of whipped foam made of polyurethane-based dispersions two-dimensionally bonded thereto, a process for preparing such a composite material, and the use thereof.
1. A sheet composite material comprising at least two foam elements bonded with one another, wherein one foam element comprises a base material of a block flexible foam and the second foam element comprises a layer of whipped foam made of polyurethane-based dispersions, wherein said whipped foam layer is perforated on the whole or part of its surface, wherein the perforations are holes having diameters within the range of from 0.1 to 2 mm and a perforation density of 10 pin/cm 2 , wherein said block flexible foam is a polyurethane foam, and wherein the perforations penetrate the entire thickness of the whipped foam layer.
2. The composite material according to claim 1 , wherein said whipped foam layer is microperforated on the whole or part of its surface.
3. The composite material according to claim 2 , wherein the layer thickness of the whipped foam is within a range of from 0.5 to 0.8 mm.
4. The composite material according to claim 3 , wherein the block flexible foam and the whipped foam are bonded together by an adhesive layer based on an aqueous polyurethane dispersion.
5. The composite material according to claim 1 , wherein the layer thickness of the whipped foam is within a range of from 0.2 to 1.0 mm.
6. The composite material according to claim 1 , wherein the block flexible foam and the whipped foam are bonded together by a continuous or non-continuous adhesive layer.
7. The composite material according to claim 1 , wherein the block flexible foam is elastic.
8. A cladding comprising the composite material according to claim 1 .
9. A sheeting comprising the composite material according to claim 1 .
10. A process for preparing the composite material according to claim 1 which comprises bonding said block flexible foam with said layer of whipped foam.
11. The process according to claim 10 , wherein the following steps are performed:
a) providing a release paper and applying a whipped foam on the whole or part of the surface thereof;
b) curing the whipped foam layer applied by step a), to form the layer of whipped foam;
c) applying an adhesive layer based on an aqueous polyurethane dispersion, to said layer of whipped foam on the side opposite of the release paper and/or to a sheet of block flexible foam;
d) applying the block flexible foam to the whipped foam with the adhesive layer therebetween; e) curing the adhesive layer; and
f) removing the release paper.
12. The process according to claim 11 , wherein steps a) to f) are performed in one operation.
13. The process according to claim 10 , wherein the following steps are performed:
a) providing a release paper and applying a whipped foam having a density within a range of from 200 to 800 g/l, on the whole or part of the surface thereof;
b) curing the whipped foam layer applied by step a), at an elevated temperature in a range of from 70 to 170° C., to form the layer of whipped foam;
c) applying an adhesive layer based on an aqueous polyurethane dispersion, to said layer of whipped foam on the side opposite of the release paper and/or to a sheet of block flexible foam;
d) applying the block flexible foam to the whipped foam with the adhesive layer therebetween;
e) curing the adhesive layer; and
f) removing the release paper.