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Method for applying abrasion resistant thin polyurethane coatings

  • US 4,435,450 A
  • Filed: 07/02/1982
  • Issued: 03/06/1984
  • Est. Priority Date: 07/02/1982
  • Status: Expired due to Term
First Claim
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1. A method for applying an abrasion resistant polyurethane coating onto a surface of a substrate while minimizing volatilization of free isocyanate comprising the steps of:

  • a. reacting an aliphatic diisocyanate with excess hydroxy-terminated diol to form a linear hydroxy-terminated prepolymer;

    b. adding to said prepolymer a triisocyanate crosslinking agent having a molecular weight greater than 500;

    c. applying said prepolymer and triisocyanate mixture in a solvent to the surface of the substrate by contacting said surface with said solution in a continuous liquid phase;

    d. evaporating said solvent; and

    e. reacting said prepolymer and triisocyanate to form a crosslinked polyurethane coating.

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