Patent ID: 9657134
Date: 2017-05-23
CPC Classifications: B32B,C08G,C09D,Y10T

Claim:
1. The polyurethane comprising a reaction product of components comprising: (a) an isocyanate functional urethane prepolymer comprising a reaction product of components comprising: (b) about 0.1 to about 0.3 equivalents of trimethylolpropane, based upon the about 1 equivalent of at least one polyisocyanate (i); (c) about 0.4 to about 0.5 equivalents of cyclohexane dimethanol, based upon the about 1 equivalent of at least one polyisocyanate (i); and (d) about 0.01 to about 0.3 equivalents of at least one polycarbonate diol, based upon the about 1 equivalent of at least one polyisocyanate (i), wherein the reaction components comprise less than about 5 weight percent of polyether polyol; wherein the prepolymer (a), the trimethylolpropane (b), the cyclohexane dimethanol (c), and the polycarbonate diol (d) are each preheated to and maintained at a temperature of at least about 100° C. for at least about 10 minutes immediately prior to mixing together within a mixing chamber of a dynamic pin mixer, degassed, and reacted at a temperature of at least about 110° C. for at least about 6 hours; and wherein the mixing chamber has a volume of about 62 cc to about 250 cc, the total flow rate components in the mixing chamber is about 499 to about 4807 grams per minute and the residence time of the components in the mixing chamber is from about 0.1 seconds to about 15 minutes.