Ultra low voc polyurethane coatings

Details Ultra low voc polyurethane coatings Ultra low voc polyurethane coatings

1995-03-08

1997-09-23

Gorr, Rachel

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...

25218222, 521159, C08G 1810

Patent

active

056705999

ABSTRACT:
This invention relates to improved two part, low VOC polyurethane coatings comprising a low viscosity polyisocyanate component having an isocyanate functionality greater than two and a polyol component having a functionality equal to or greater than two. The improvement resides in the utilization of a unique isocyanate component in the two part polyurethane coating formulation. The isocyanate component comprises said low viscosity polyisocyanate component and an isocyanate terminated or end capped prepolymer formed by the reaction of a diisocyanate and a multifunctional polyol, the prepolymer having at least about 85 preferably 90 percent by weight of a 2:1 adduct of isocyanate to polyol (NCO/OH) and less than about 1 and preferably less than about 0.5% by weight of residual diisocyanate monomer therein.

REFERENCES:
patent: 3218348 (1965-11-01), McElroy et al.
patent: 3384624 (1968-05-01), Heiss
patent: 3726825 (1973-04-01), Woodward et al.
patent: 5115071 (1992-05-01), Quay et al.
patent: 5208334 (1993-05-01), Potter et al.
patent: 5243011 (1993-09-01), Panandiker et al.
patent: 5250650 (1993-10-01), Boretzky et al.

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