Multilayer polyurethane protective films
Assignee3M Innovative Properties Company
InventorsCharlie C. Ho, Kenneth J. Halford
Life of this patent
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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.
Claims33
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The vehicle according to claim 23, wherein said polyurethane is the reaction product of said polyol and a mixture of a diisocyanate and an aliphatic triisocyanate.
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The vehicle according to claim 23, wherein said polyurethane is said polyester-based polyurethane.
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The vehicle according claim 23, wherein said polyurethane is an aliphatic polyurethane.
The vehicle according claim 23, wherein said polyurethane is a slightly crosslinked polyurethane.
The vehicle according to claim 23, wherein said polyurethane is a water-based polyurethane.
The vehicle according to claim 23, wherein said polyurethane is a solvent-based polyurethane.
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The vehicle according to claim 23, wherein the opposite major surface of said second layer is corona treated.
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The vehicle according to claim 23, wherein said film is colored
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A vehicle comprising a body part having a painted surface, with said painted surface being protected by 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.
A method of making a multilayer protective film, said method comprising:
- (a) forming a first layer comprising a polyurethane, the polyurethane being a polyester-based polyurethane, a polycarbonate-based polyurethane or a combination of both;
- (b) forming a second layer comprising a polycaprolactone-based thermoplastic polyurethane;
- (c) forming a PSA layer comprising a pressure sensitive adhesive;
- (d) bonding one major surface of the first layer to one major surface of the second layer;
- and
- (e) bonding the PSA layer to an opposite major surface of the second layer,
- wherein the second layer is sandwiched between the first layer and the PSA layer.
Dependencies are inferred from the claim text.