Multilayer polyurethane protective films
First Claim
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1. A multilayer protective film comprising:
- a first layer comprising a polyurethane, said polyurethane being a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination of both;
a second layer comprising a polycaprolactone-based thermoplastic polyurethane; and
a PSA layer comprising a pressure sensitive adhesive,wherein said first layer is bonded to one major surface of said second layer and said PSA layer is bonded to an opposite major surface of said second layer such that said second layer is sandwiched between said first layer and said PSA layer, and said multilayer protective film is clear, transparent, and passes the “
Staining and Discoloration Test”
after being exposed to at least one of the fluids from the group consisting of grease, tar, transmission fluid, motor oil, fuel oil, diesel oil, gear oil, and SUNOCO lub/grease.
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Abstract
A multilayer protective film comprising a first layer, a second layer and a PSA layer. The first layer at least comprises a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination or blend of both. The second layer at least comprises a polycaprolactone-based thermoplastic polyurethane. The PSA layer comprises a pressure sensitive adhesive. One major surface of the first layer is bonded to one major surface of the second layer, and the PSA layer is bonded to an opposite major surface of the second layer such that the second layer is sandwiched between the first layer and the PSA layer.
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Citations
24 Claims
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1. A multilayer protective film comprising:
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a first layer comprising a polyurethane, said polyurethane being a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination of both; a second layer comprising a polycaprolactone-based thermoplastic polyurethane; and a PSA layer comprising a pressure sensitive adhesive, wherein said first layer is bonded to one major surface of said second layer and said PSA layer is bonded to an opposite major surface of said second layer such that said second layer is sandwiched between said first layer and said PSA layer, and said multilayer protective film is clear, transparent, and passes the “
Staining and Discoloration Test”
after being exposed to at least one of the fluids from the group consisting of grease, tar, transmission fluid, motor oil, fuel oil, diesel oil, gear oil, and SUNOCO lub/grease. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A multilayer protective film comprising:
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a first layer comprising a polyurethane, said polyurethane being a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination of both; a second layer comprising a polycaprolactone-based thermoplastic polyurethane; and a PSA layer comprising a pressure sensitive adhesive, wherein said first layer is bonded to one major surface of said second layer and said PSA layer is bonded to an opposite major surface of said second layer such that said second layer is sandwiched between said first layer and said PSA layer, adhesion between said first layer and said second layer passes the “
Tape Snap Adhesion Test”
, said multilayer protective film passes the “
Staining and Discoloration Test”
, and said first layer has an exposed major surface with the appearance of having been cast onto a smooth major surface of a releasable carrier web, dried and the carrier web removed. - View Dependent Claims (21, 22, 23)
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24. A method of making a multilayer protective film, said method comprising:
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forming a first layer comprising a polyurethane, the polyurethane being a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination of both; forming a second layer comprising a polycaprolactone-based thermoplastic polyurethane by extruding the polycaprolactone-based thermoplastic polyurethane at an elevated temperature through a die to form the second layer; forming a PSA layer comprising a pressure sensitive adhesive; bonding one major surface of the first layer to one major surface of the second layer by laminating one major surface of the first layer to one major surface of the second layer after said extruding and with at least the one major surface of the first layer and the second layer being at a temperature that does not facilitate adequate bonding between the first layer and the second layer, and heating the one major surface of the second layer to an elevated temperature that is sufficiently higher than room temperature to facilitate adequate bonding between the first layer and the second layer during said laminating, with said heating occurring before or during said laminating; bonding the PSA layer to an opposite major surface of the second layer; releasably laminating an opposite major surface of the second layer to a releasable carrier web after said extruding; exposing the opposite major surface of the second layer, after said releasably laminating; and corona treating the opposite major surface of the second layer, after said exposing and before said bonding the PSA layer, wherein the second layer is sandwiched between the first layer and the PSA layer.
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Specification