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Multilayer polyurethane protective films

  • US 10,213,992 B2
  • Filed: 12/15/2014
  • Issued: 02/26/2019
  • Est. Priority Date: 04/29/2005
  • Status: Active Grant
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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