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

A laminated transparency comprising:

• (1) at least one layer of a polyurethane consisting of a reaction product of components consisting of:
• (a) an isocyanate functional urethane prepolymer consisting of a reaction product of components consisting of:
• (i) about 1 equivalent of at least one polyisocyanate;
• and
• (ii) about 0.3 to about 0.4 equivalents of pentanediol;
• and
• (b) about 0.3 to about 0.6 equivalents of trimethylolpropane based upon the about 1 equivalent of at least one polyisocyanate (i);
• and
• (c) about 0.1 to about 0.4 equivalents of butanediol or pentanediol based upon the about 1 equivalent of at least one polyisocyanate (i),
• 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;
• and
• (2) at least one layer of a substrate selected from the group consisting of glass, organic polymeric materials, and combinations thereof.

A laminated transparency comprising:

• (1) at least one layer of a polyurethane consisting of a reaction product of components consisting of:
• (a) an isocyanate functional urethane prepolymer consisting of a reaction product of components consisting of:
• (i) about 1 equivalent of at least one polyisocyanate;
• and
• (ii) about 0.3 to about 0.4 equivalents of pentanediol;
• and
• (b) about 0.3 to about 0.6 equivalents of trimethylolpropane based upon the about 1 equivalent of at least one polyisocyanate (i);
• and
• (c) about 0.1 to about 0.4 equivalents of butanediol or pentanediol based upon the about 1 equivalent of at least one polyisocyanate (i),
• (2) at least one layer comprising polycarbonate.

An article comprising at least one layer of a polyurethane, wherein the polyurethane consists of a reaction product of components consisting of:

• (a) an isocyanate functional urethane prepolymer consisting of a reaction product of components consisting of:
• (i) about 1 equivalent of at least one polyisocyanate;
• and
• (ii) about 0.3 to about 0.4 equivalents of pentanediol;
• and
• (b) about 0.3 to about 0.6 equivalents of trimethylolpropane based upon the about 1 equivalent of at least one polyisocyanate (i);
• and
• (c) about 0.1 to about 0.4 equivalents of butanediol or pentanediol based upon the about 1 equivalent of at least one polyisocyanate (i),
• 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;
• and
• wherein the article is selected from the group consisting of transparencies, optical articles, photochromic articles, ballistic resistant articles, and glazings.