Method for preparing a color pigmented moisture curing polyurethane coating
OwnerBhaskar R. Ursinventor
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Abstract
This invention relates to a new and useful process for color pigmented moisture curing polyurethanes. The process is comprised of preparing a slurry of specified color pigments, solvents, and additives to which is added a specified quantity of a chosen monomeric diisocyanate. A polyol (or other suitable hydrogen donor) is added to the slurry and the monomeric diisocyanate. Pigments are then dispersed in the aforesaid admixture. To the aforesaid admixture, called a color pigment dispersion, isocyanate prepolymers are added. The completed admixture results in a stable colored moisture curing (air drying) polyurethane for use as a protective and decorative coating.
Claims23
A moisture-curable coating composition which comprises the mixture of a pigment dispersion and a second isocyanate prepolymer, said pigment dispersion comprising from two to 70 percent by weight of pigment and 10 to 90 percent by weight of a first prepolymer reaction product of an organic polyisocyanate and an organic polyol, said first prepolymer exhibiting excess hydroxyl groups, said composition containing from 10 to 90 percent by weight of said pigment dispersion and 10 to 90 percent by weight of said second prepolymer, said second prepolymer comprising an excess of isocyanate groups capable of reacting with and consuming all of said hydroxyl groups on the first prepolymer and providing an excess of unreacted isocyanate groups, said moisture-curable composition containing from 0 to 60 percent by weight of a dispersing solvent.
A method for preparing a color pigmented moisture curing polyurethane composition comprising the steps of combining:
- a color pigment dispersion comprising from 2% to 70% by weight of a pigment and a first prepolymer reaction product of an organic diisocyanate and an organic polyol;
- and
- a second isocyanate prepolymer from 10% to 90% by weight.
A method for preparing a color pigmented moisture curing polyurethane composition, said method comprising the steps of combining a color pigment dispersion, and a second prepolymer said dispersion comprising:
- ______________________________________ Percentage by Weight ______________________________________ A slurry of:
- Titanium Dioxide pigment 40.00% Phthalo Cyanine Blue pigment 1.33% Methyl Isobutyl Ketone 21.42% dispersent - solvent Silicone Fluid to improve .13% flow and slip A non-ionic 1.00% wetting agent;
- said pigments, solvents and additives being combined in a jacketed tank;
- plus A diisocyante 5.20% + amount (Isophorone Diisocyanate), needed (IPDI), agitated with said for slurry at between 50.degree. C. and dehydra- 70.degree. C. until the water is tion of H.sub.2 O eliminated from the slurry, from slurry said elimination of water being confirmed by a Karl-Fischer titration test;
- plus A polycaprolactone polyol, 30.67% forming a color pigmented paste that is mechanically dispersed, resulting in said color pigmented dispersion;
- and 100.00% ______________________________________
- a second prepolymer.
Dependencies are inferred from the claim text.