Polyurethane coatings and adhesives
AssigneeUop LLC
InventorsDavid W. House, Ray V. Scott, Jr.
Life of this patent
Estimating the term…
Abstract
The polyurethanes resulting from curing isocyanate-terminated urethane prepolymers 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 systemor 2-pack system. The diamine N,N'-di(2-butyl)4,4'-methylenedianiline is a particularly useful diamine.
Claims38
A method of bonding two surfaces each of which is selected from the group consisting of rubber, plastics, wood, metal, fabrics, paper, and leather comprising placing between said surfaces of film of a polyurethane resulting from the reaction of an isocyanate terminated urethane prepolymer, said prepolymer being the adduct of from about 1.5 to about 4.0 equivalents of a polyisocyanate with 1 equivalent of a polyol, with from about 0.80 to about 1.2 equivalents of a secondary aromatic diamine as the sole curing agent of the structure, ##STR2## where each alkyl group, R.sub.1 and R.sub.2, contains from 4 to about 20 carbon atoms, pressing together said surfaces so that each surface is in contact with the film under pressure, heating the film to a temperature between 75.degree. and 150.degree. C. for a time sufficient to melt the film, and cooling the film while maintaining the surfaces under pressure for a time sufficient to achieve adhesion.
A method of bonding two surfaces each of which is selected from the group consisting of rubber, plastics, wood, metal, fabrics, paper, and leather comprising applying to at least one surface;
- (1) an isocyanate terminated urethane prepolymer, said prepolymer being the adduct of from about 1.5 to about 4.0 equivalents of a polyisocyanate with 1 equivalent of a polyol, and;
- (2) from about 0.80 to about 1.2 equivalents of a secondary aromatic diamine of the structure, ##STR3## where each alkyl group, R.sub.1 and R.sub.2, contains from 4 to about 20 carbon atoms;
- then pressing together said surfaces, and heating the mass at a temperature between about 75.degree. and about 150.degree. C. to react the prepolymer with the diamine as the sole curing agent so as to form a polyurethane adhesively bonded to each of said surfaces.
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 polyurethane resulting from the reaction of an isocyanate terminated urethane prepolymer, said prepolymer being the adduct of from about 1.5 to about 4.0 equivalents of a polyisocyanate with 1 equivalent of a polyol, with from about 0.80 to about 1.2 equivalents of a secondary aromatic diamine as the sole curing agent 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;
- (1) an isocyanate terminated urethane prepolymer, said prepolymer being the adduct of from about 1.5 to about 4.0 equivalents of a polyisocyanate with 1 equivalent of a polyol, and;
- (2) from about 0.80 to about 1.2 equivalents of a secondary aromatic diamine of the structure, ##STR5## where each alkyl group, R.sub.1 and R.sub.2, contains from 4 to about 20 carbon atoms;
- and then reacting the prepolymer with the diamine as the sole curing agent at a temperature from about 75.degree. to about 150.degree. C. so as to form a polyurethane on said surface.
Dependencies are inferred from the claim text.