Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2011-07-12
2011-07-12
Cano, Milton I (Department: 1763)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C502S131000, C502S172000, C502S239000, C502S310000
Reexamination Certificate
active
07977446
ABSTRACT:
This invention relates to an organotin-based catalyst system for polyurethane synthesis that is useful in coatings applications. The catalyst has low activity in the absence of oxygen. When a coating mixture comprising the catalyst is sprayed and/or applied to a substrate as a thin film in air, the catalyst is activated. For solvent-based refinish systems comprising hydroxyl and isocyanate species at high solids levels, the catalyst system therefore provides extended viscosity stability, i.e., pot life.
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Feldman Jerald
McLain Stephan J.
Cano Milton I
E. I. Du Pont de Nemours and Company
Leonard Michael
Myers Brian J.
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