Solventless polyurethane spray compositions and method for applying them
AssigneeAmeron, Inc.
InventorNorman R. Mowrer
Life of this patent
Estimating the term…
Abstract
A method for preparing polyurethane by spraying solventless, equal volume mixtures of: (a) a liquid polyisocyanate; polyisocyanurate or isocyanate terminated quasi-prepolymer; and (b) a curing agent comprised of a blend of from about 0 to 15% of a polyamine having an equivalent weight from about 30 to about 200, about 10 to 20% of a low molecular weight glycol having an equivalent weight of from about 30 to 200, about 40 to 80% of a relatively high molecular weight polyol or polyamine having an equivalent weight of about 350 to 2000, and about 1 to 20% of a synthetic zeolite molecular sieve, wherein the average equivalent weight of (b) is from about 150 to 500.
Claims21
A two-component solventless spray composition for producing polyurethane and poly(urea)urethane coatings comprised of substantially equal volumes of:
- an isocyanate-containing component comprised of a liquid polyisocyanate, polyisocyanurate or isocyanate-terminated prepolymer or quasi-prepolymer;
- and
- a curative component comprised of from about 0% to about 15% by weight of one or more polyamines or alkanolamines in an amount sufficient to react to form a thixotropic mixture about 15 seconds to about 2 minutes after being mixed with the isocyanate-containing component, from about 10% to about 20% by weight of one or more glycols having an equivalent weight in the range from about 30 to about 200, from about 40% to about 80% by weight of one or more high molecular weight polyols or polyamines having an equivalent weight in the range from about 300 to about 2000, and at least about 1% by weight of one or more additives to adsorb moisture or carbon dioxide.
A two-component solventless spray composition for producing polyurethane and poly(urea)urethane coatings comprised of:
- an isocyanate-containing component comprised of a liquid polyisocyanate, polyisocyanurate or isocyanate-terminated prepolymer or quasi-prepolymer;
- and
- a curative component comprised of from about 0% to about 15% by weight of one or more polyamines or alkanolamines in an amount sufficient to form a coating which is substantially tack-free within about 5 minutes to about 60 minutes after being mixed with the isocyanate-containing component, from about 10% to about 20% by weight of one or more glycols having an equivalent weight in the range from about 30 to about 200, from about 40% to about 80% be weight of one or more high molecular weight polyols or polyamines having an equivalent weight in the range from about 300 to about 2000, and from about 1% to about 20% by weight of one or more additives to adsorb moisture or carbon dioxide.
A two-component solventless spray composition for producing polyurethane and poly(urea)urethane coatings comprised of:
- an isocyanate-containing component comprised of a liquid polyisocyanate, polyisocyanurate or isocyanate-terminated prepolymer or quasi-prepolymer;
- and
- a curative component comprised of from about 2% to about 7% by weight of one or more polyamines or alkanolamines having an equivalent weight in the range from about 30 to about 200, from about 10% to about 20% by weight of one or more glycols having an equivalent weight in the range from about 30 to about 200, from about 40% to about 80% by weight of one or more high molecular weight polyols or polyamines having an equivalent weight in the range from about 300 to about 2000, and from about 1% to about 20% by weight of one or more additives to adsorb moisture or carbon dioxide.
A method for the solventless spray application of a polyurethane or poly(urea)urethane coating, comprising the steps of:
- delivering to a manifold an isocyanate-containing component comprised of a liquid polyisocyanate, polyisocyanurate or isocyanate-terminated prepolymer or quasi-prepolymer;
- delivering to said manifold a curative component comprised of from about 0% to about 15% by weight of one or more polyamines or alkanolamines having an equivalent weight in the range from about 30 to about 200, from about 10% to about 20% by weight of one or more glycols having an equivalent weight in the range from about 30 to about 200, from about 40% to about 80% by weight of one or more high molecular weight polyols or polyamines having an equivalent weight in the range from about 300 to about 2000, and from about 1% to about 20% by weight of one or more additives to adsorb moisture or carbon dioxide;
- mixing the isocyanate-containing component and the curative component with each other;
- and
- spraying the resulting mixture through an atomizing nozzle onto a surface to produce a polyurethane or poly(urea)urethane coating.
Dependencies are inferred from the claim text.