PROTECTIVE STRUCTURES FOR LAMINATES
Protective structures for use with laminates and laminates including the protective structure are provided that may be used in a variety of different applications, such as shatter resistant windows for vehicles and buildings. A protective structure comprises a first layer comprising polycarbonate (PC), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), acrylic or a combination thereof. The first layer has a first surface and a second surface opposite the first surface. The structure further includes a hard coating on the first surface of the first layer and a second layer comprising a thermoplastic polyurethane (TPU) in contact with the second surface of the first layer. Forming a protective structure into a single film or layer reduces material handling and cost. In addition, this structure has fewer independent webs and can be manufactured with a reduced thickness, thereby further reducing manufacturing costs.
1 . A protective structure comprising:
a first layer comprising a material selected from the group consisting of polycarbonate (PC), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), acrylic and a combination thereof, the first layer having a first surface and a second surface opposite the first surface;
a hard coating on the first surface of the first layer; and
a second layer comprising a thermoplastic polyurethane (TPU) in contact with the second surface of the first layer.
2 . The protective structure of claim 1 , wherein the structure has a thickness of about 0.015 inches to about 0.020 inches.
3 . The protective structure of claim 2 , wherein the thickness is about 0.016 to about 0.018 inches.
4 . The protective structure of claim 1 , wherein the second layer is extruded onto the first layer to form a single structure.
5 . The protective structure of claim 1 , wherein the first layer has a thickness of about 0.005 to about 0.009 inches.
6 . The protective structure of claim 4 , wherein the second layer has a thickness of about 0.008 to about 0.012 inches.
7 . The protective structure of claim 1 , wherein the protective structure has a haze of less than about 1%.
8 . The protective structure of claim 1 , wherein the protective structure has a light transmission of greater than about 90%.
9 . The protective structure of claim 1 , wherein the hard coating comprises a material selected from the group consisting of acrylics and silicones.
10 . The protective structure of claim 1 , further comprising a third layer in contact with a surface of the second layer opposite the first layer, the third layer comprising a release liner.
11 . The protective structure of claim 1 , wherein the hard coating is sputter coated to the first layer.
12 . The protective structure of claim 1 , wherein the first layer comprises PET.
13 . A window comprising the protective structure of claim 1 .
14 . A laminate comprising:
an optically transparent substrate; and
a protective structure adhered to the substrate, the protective structure comprising:
a first layer comprising a material selected from the group consisting of polycarbonate (PC), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), acrylic and a combination thereof, the first layer having a first surface and a second surface opposite the first surface;
a hard coating on the first surface of the first layer; and
a second layer comprising a thermoplastic polyurethane (TPU) in contact with the second surface of the first layer and in contact with the optically transparent substrate.
15 . The laminate of claim 14 , wherein the substrate comprises a material selected from the group consisting of glass, artificial glass, polycarbonate, acrylic, polyester, polyether, and polyurethane.
16 . The laminate of claim 14 , wherein the protective structure has a thickness of about 0.015 inches to about 0.020 inches.
17 . The laminate of claim 14 , wherein the second layer is extruded onto the first layer to form a single structure.
18 . The laminate of claim 14 , wherein the first layer has a thickness of about 0.005 to about 0.009 inches, and the second layer has a thickness of about 0.008 to about 0.012 inches.
19 . The laminate of claim 14 , wherein the hard coating comprises a material selected from the group consisting of acrylics and silicones.
20 . The laminate of claim 14 , further comprising a third layer in contact with a surface of the second layer opposite the first layer, the third layer comprising a release liner.
21 . The laminate of claim 14 , wherein the protective structure is in contact with a first surface of the substrate, the laminate further comprising an interlayer in contact with a second surface of the substrate opposite the first surface.
22 . The laminate of claim 21 , further comprising a second optically transparent substrate in contact with the interlayer opposite the first substrate.
23 . The laminate of claim 14 , wherein the first layer comprises PET.