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US 4,616,043 AGranted
Aliphatic polyurethane sprayable coating compositions and method of preparation
AssigneeThermocell Development, Ltd.
InventorStuart B. Smith
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AssigneeThermocell Development, Ltd.
InventorStuart B. Smith
Estimating the term…
A light stable, fast reacting, aliphatic polyurethane sprayable coating composition and injectable open molding material is prepared by reacting an A side composition comprising a trimerized or biuret polymethylene polyisocyanate prepolymer with a B side composition comprising an admixture of an alkoxy polyalkylene glycol, such as methoxypolyethylene glycol and an aromatic polyamine such as a diethyl toluene diamine to provide a polyurethane reaction product which rapidly gels, may be quickly removed from the mold, has good green strength and high temperature resistance and is characterized by good ultraviolet or light stability properties. Optionally, the B side composition may contain a catalytic amount of a metal carboxylate like lead napthenate. The A and B side compositions may be sprayed onto a mat in an open mold and also may be sprayed in conjunction with chopped glass fibers, to form a glass-fiber spray coating.
A process for preparing a light stable, fast reacting, aliphatic polyurethane product, which process comprises admixing and reacting an A side and a B side composition as a reaction mixture, the A side composition comprising 100 parts of a trimerized or biuret polymethylene polyisocyanate prepolymer having free NCO groups and a B side component composition comprising an admixture of an alkoxy polyalkylene glycol and an aromatic diamine, wherein the aromatic diamine is present in a chain-extending amount of from about 10 to 50 parts by weight per 100 parts by weight of the prepolymer, and the alkoxy polyalkylene glycol is present in an amount of from about 10 to 150 parts by weight of the prepolymer, to provide a fast reacting, aliphatic polyurethane reaction product.
A process for preparing a light stable, fast reacting, aliphatic polyurethane reaction product, which process comprises admixing and reacting together an A side composition comprising 100 parts by weight of a trimerized or biuret hexamethylene diisocyanate prepolymer having up to about 35 percent by weight of free NCO groups with a B side composition comprising an admixture of a methoxypolyethylene glycol and an aromatic diamine, wherein the aromatic diamine is present in a chain-extending amount of from about 10 to 50 parts by weight per 100 parts by weight of the prepolymer, and the alkoxy polyalkylene glycol is present in an amount of from about 10 to 150 parts by weight of the prepolymer, to provide a polyurethane reaction product which gels in less than about 20 seconds and has good green strength.
Dependencies are inferred from the claim text.