Composite thermoplastic laminate
A composite sheet material includes a cover sheet, a substrate and an adhesion promoting layer. The cover sheet has a cover sheet material. The substrate has a substrate material. The adhesion promoting layer is disposed between the cover sheet and the substrate. A first side of the adhesion promoting layer disposed towards the cover sheet has an affinity to bond with the cover sheet material. A second side of the adhesion promoting layer disposed towards the substrate has an affinity to bond with the substrate material.
1. A composite sheet material, comprising:
a cover sheet having a cover sheet material that includes polyethylene terephthalate;
a substrate having a substrate material that includes polypropylene; and
an adhesion promoting layer disposed between the cover sheet and the substrate, wherein
a first side of the adhesion promoting layer is disposed towards the cover sheet and in contact with the cover sheet,
a second side of the adhesion promoting layer is disposed towards the substrate and in contact with the substrate,
the second side of the adhesion promoting layer includes polypropylene drawn from the substrate,
the first side of the adhesion promoting layer has an affinity to bond to the coversheet material, and
the second side of the adhesion promoting layer has an affinity to bond to the substrate material.
2. The composite sheet material of claim 1 , wherein the adhesion promoting layer includes ethyl vinyl acetate.
3. The composite sheet material of claim 1 , wherein the adhesion promoting layer includes ethylene methyl acrylate.
4. The composite sheet material of claim 1 , wherein the adhesion promoting layer includes an oxazoline.
5. The composite sheet material of claim 4 , wherein the oxazoline is disposed in an acrylic based resin.
6. The composite sheet material of claim 5 , wherein the oxazoline includes an oxazoline cross linker.
7. The composite sheet material of claim 6 , wherein the oxazoline cross linker is mixed with an ethylene acrylic acid.
8. The composite sheet material of claim 1 , further comprising a polyurethane adhesion promoting layer.
9. The composite sheet material of claim 8 , wherein the cover sheet is disposed between the polyurethane adhesion promoting layer and the substrate.
10. The composite sheet material of claim 8 , wherein the substrate is disposed between the polyurethane adhesion promoting layer and the cover sheet.
11. The composite sheet material of claim 8 , wherein the polyurethane adhesion promoting layer includes a urethane prepolymer.
12. The composite sheet material of claim 11 , wherein the urethane prepolymer includes an isocynate or alcohol group at an end of a polymer chain.
13. The composite sheet material of claim 11 , wherein the polyurethane adhesion promoting layer includes an acrylic polymer that includes an acrylic acid.
14. The composite sheet material of claim 1 , further comprising a backing layer having a backing layer material, the substrate being disposed between the cover sheet and the backing layer.
15. The composite sheet material of claim 1 , wherein the cover sheet material includes biaxially-oriented polyethylene terephthalate.
16. The composite sheet material of claim 1 , wherein
the first side of the adhesion promoting layer has an affinity to bond to polyethylene terephthalate, and
the second side of the adhesion promoting layer has an affinity to bond to the substrate material.
17. The composite sheet material of claim 1 , wherein the adhesion promoting layer includes a maleic anhydride functionalized polypropylene.
18. The composite sheet material of claim 1 , wherein the substrate includes fiberglass.