Polyurethanes, articles and coatings prepared therefrom and methods of making the same

A coating composition for coating an article, the coating composition comprising a polyurethane comprising a reaction product of components comprising:

• (a) an isocyanate functional urethane prepolymer comprising a reaction product of components comprising:
• (i) 1 equivalent of at least one polyisocyanate;
• and
• (ii) 0.3 to 0.4 equivalents of butanediol or pentanediol based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (b) 0.3 to 0.7 equivalents of trimethylolpropane based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (c) up to 0.4 equivalents of butanediol or pentanediol based upon the 1 equivalent of the at least one polyisocyanate,
• wherein the reaction product components are essentially free of polyester polyol and polyether polyol,
• wherein the prepolymer (a), trimethylolpropane (b), and butanediol or pentanediol (c) are each preheated to and maintained at a temperature of about 120° C. to about 140° C. for at least about 10 minutes immediately prior to mixing together within a mixing chamber of a dynamic pin mixer, wherein the mixing chamber has a volume of about 62 cc to about 250 cc, the total flow rate of components into the mixing chamber is about 499 to about 4807 grams per minute, and wherein the residence time of the components in the mixing chamber is from about 0.1 seconds to about 5 minutes.

A coating composition for coating an article, the coating composition comprising a polyurethane comprising a reaction product of components consisting of:

• (a) an isocyanate functional urethane prepolymer comprising a reaction product of components comprising:
• (i) 1 equivalent of at least one polyisocyanate;
• and
• (ii) 0.3 to 0.4 equivalents of butanediol or pentanediol based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (b) 0.3 to 0.6 equivalents of trimethylolpropane based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (c) 0.1 to 0.4 equivalents of butanediol or pentanediol based upon the 1 equivalent of the at least one polyisocyanate,
• wherein the prepolymer (a), trimethylolpropane (b), and butanediol or pentanediol (c) are each preheated to and maintained at a temperature of about 120° C. to about 140° C. for at least about 10 minutes immediately prior to mixing together within a mixing chamber of a dynamic pin mixer, wherein the mixing chamber has a volume of about 62 cc to about 250 cc, the total flow rate of components into the mixing chamber is about 499 to about 4807 grams per minute, and wherein the residence time of the components in the mixing chamber is from about 0.1 seconds to about 5 minutes.

A coating composition for coating an article, the coating composition comprising a polyurethane comprising a reaction product of components comprising:

• (a) an isocyanate functional urethane prepolymer comprising a reaction product of components comprising:
• (i) 1 equivalent of at least one polyisocyanate;
• and
• (ii) 0.1 to 0.5 equivalents of at least one diol having 2 to 18 carbon atoms based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (b) 0.05 to 0.9 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups based upon the 1 equivalent of the at least one polyisocyanate;
• and
• (c) up to 0.45 equivalents of at least one diol having 2 to 18 carbon atoms based upon the 1 equivalent of the at least one polyisocyanate,
• wherein the reaction product components are essentially free of polyester polyol and polyether polyol,
• wherein the prepolymer (a), polyol (b), and diol (c) are each preheated to and maintained at a temperature of about 120° C. to about 140° C. for at least about 10 minutes immediately prior to mixing together within a mixing chamber of a dynamic pin mixer, wherein the mixing chamber has a volume of about 62 cc to about 250 cc, the total flow rate of components into the mixing chamber is about 499 to about 4807 grams per minute, and wherein the residence time of the components in the mixing chamber is from about 0.1 seconds to about 5 minutes.