Foam laminate product and process for production thereof
A laminate product comprising a foam core having a pair of opposed major surfaces and a cover layer secured with respect to each major surface is described. The cover layer comprises a polymeric substrate having disposed therein a plurality of reinforcing fibrous material. It has been found that it is possible to produce a foam laminate product having improved stiffness if a lower amount of reinforcing material is used for a given amount of polymer substrate. In particular, it has been found possible to provide an improved foam laminate product having a relatively high ratio of stiffness to weight of reinforcing fibrous material. It has been further discovered that the stiffness of the resulting foam laminate product can be increased when the polymer substrate and the reinforcing fibrous material are present in a weight ratio of greater than 2.5. This is believed to be the result of improved encapsulation of the reinforcing fibrous material by the polymer substrate.
1. A laminate product comprising:
a pre-made flexible isocyanate-based foam core having a pair of opposed major surfaces; and
a cover layer secured with respect to each major surface, the cover layer comprising a polymeric substrate and a fibrous fabric material,
wherein a weight ratio of the polymeric substrate to the fibrous material is greater than 2.5:1,
wherein the polymeric substrate is melted so as to substantially fully wet, fully permeate, and fully encapsulate the fibrous material, and
wherein the laminate product has a stiffness-to-weight-of-the-fibrous material ratio greater than the stiffness-to-weight-of-the-fibrous material ratio of a control laminate product which has a 1:1 weight ratio of polymer substrate to fibrous material.
2. The laminate product defined in claim 1 , wherein the foam core comprises an compression force deflection at 10% deflection in the range of from about 10 psi to about 80 psi when measured pursuant to ASTM 3574-D.
3. The laminate product defined in claim 1 , wherein the foam core comprises a polyurethane foam.
4. The laminate product defined in claim 1 , wherein the foam core has a substantially uniform density.
5. The laminate product defined in claim 1 , wherein the foam core has a variable density.
6. The laminate product defined in claim 1 , wherein the foam core has a density in the range of from about 2 to about 15 pounds per cubic foot.
7. The laminate product defined in claim 1 , wherein the fibrous fabric material is in the form of a porous material layer.
8. The laminate product defined in claim 7 , wherein the cover layer comprises from 2 to 15 porous material layers.
9. The laminate product defined in claim 7 , wherein the cover layer comprises from 4 to 8 porous material layers.
10. The laminate product defined in claim 1 , wherein the polymeric substrate comprises an organic polymer.
11. The laminate product defined in claim 1 , wherein the polymeric substrate comprises a polyolefin.
12. The laminate product defined in claim 1 , wherein the polymeric substrate comprises polyethylene.
13. The laminate product defined in claim 1 , wherein the fibrous fabric material is selected from the group consisting of glass, basalt, carbon, polyester, ceramic polyamide, polyimide, rayon, metal alloys, mixtures of any of these copolymers of any of these, hybrids of any of these and interpenetrating networks of any of these.
14. The laminate product defined in claim 1 , wherein the foam core comprises a thickness in the range of from about 4 mm to about 12 mm.
15. The laminate product defined in claim 1 , wherein the polymeric substrate and the fibrous fabric material are present in a weight ratio in the range of from about 3:1 to about 6:1.
16. The laminate product defined in claim 1 , wherein the polymeric substrate and the fibrous fabric material are present in a weight ratio in the range of from about 3.5:1 to about 5:1.
17. The laminate product defined in claim 1 , wherein the polymeric substrate and the fibrous fabric material are present in a weight ratio in the range of from about 3.5:1 to about 4.5:1.
18. A vehicular headliner comprising the laminate product defined in claim 1 .
19. The laminate product defined in claim 1 , wherein the weight ratio of the polymeric substrate to the fibrous fabric material is less than 6:1.
20. The laminate product defined in claim 1 , wherein each cover layer comprises a polymeric substrate on both opposing faces of the fibrous fabric material.