Method for applying abrasion resistant thin polyurethane coatings
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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Abstract
A method for applying a thin abrasion resistant polyurethane coating while minimizing exposure to volatile free isocyanate is disclosed. The method involves forming a hydroxy-terminated prepolymer which is subsequently crosslinked using a relatively non-volatile triisocyanate, and applying the material by flow coating or dip coating techniques, rather than spraying, in order to minimize volatilization.
28 Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification