Polyurea coatings for objects of metal glass wood or plastic
AssigneeUop LLC
InventorsDavid W. House, Ray V. Scott, Jr.
Life of this patent
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Abstract
The polyurea resulting from curing polyfunctional isocyanates having at least three groups with a N,N'-dialkylmethylenedianiline are broadly useful as coatings on the surface of objects made of metal, wood, glass, or plastic. Such coatings may be made based on either a 1-pack system or 2-pack system. The diamine N,N'-di(2-butyl)4,4'-methylenedianiline is a particularly useful diamine. Biurets are an especially desirable class of polyisocyanates for the polyureas of this invention.
Claims27
A method of coating an object of metal, glass, wood, or plastic comprising applying to a surface of the object a solution or dispersion of a polyurea resulting from the reaction of a polyisocyanate having at least three isocyanate moieties with from about 0.8 to about 1.2 equivalents of a secondary aromatic diamine of the structure, ##STR4## where each alkyl group, R.sub.1 and R.sub.2, contains from 4 to about 20 carbon atoms, and evaporating the solvent or dispersing medium.
A method of coating an object of metal, glass, wood, or plastic comprising applying to a surface of the object a polyisocyanate having at least three isocyanate moieties and from about 0.8 to about 1.2 equivalents of a secondary aromatic diamine of the structure, ##STR6## where each alkyl group, R.sub.1 and R.sub.2, contains from 4 to about 20 carbon atoms, and reacting the prepolymer with the diamine at a temperature from about 75.degree. to about 130.degree. C. so as to form a polyurea on said surface.
Dependencies are inferred from the claim text.