Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1996-06-17
1998-09-01
Niland, Patrick D.
Coating processes
With post-treatment of coating or coating material
Heating or drying
4273722, 524539, 524591, 524839, 524840, B05D 302, C08J 300, C08K 320, C08L 7500
Patent
active
058008721
ABSTRACT:
The present invention relates to a composition being an aqueous dispersion of a polyurethane in water, said composition comprising water and the reaction product of (a) a water-dispersible isocyanate-terminated polyurethane prepolymer having an isocyanate content of between 1 and 15% by weight. The prepolymer comprises the following: an organic polyisocyanate adduct mixture having an average isocyanate functionality of between 2.0 and 4.0, and (b) an isocyanate reactive chain extender having a specified ratio of isocyanate reactive moiety to isocyanate index of the polyisocyanate adduct mixture. The polyisocyanate mixture must contain some dimer; however, other polyisocyanates, such as diisocyanates and polyisocyanate trimers, are advantageously added to the mixture. Also disclosed is a process for preparing this composition, and a method for coating a substrate with the composition.
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patent: 5098983 (1992-03-01), Mosbach et al.
patent: 5563206 (1996-10-01), Eicken et al.
Odian, G., Principles of Polymerization, 1981, pp. 20-25 and 279-281.
Chen Augustin T.
Feegel Richard J.
Katz Lawrence E.
Reisch John W.
Arco Chemical Technology L.P.
Niland Patrick D.
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