Patent ID: 8466254
Filing Date: 2013-06-18
Classification: C08G,G03G

Abstract:
1. A process comprising: reacting an organic diol selected from the group consisting of 1,2-propanediol, 1,3-propanediol, 1,3-butane diol pentylene glycol, hexylene glycol, diphenol, neopentyl glycol, diethylene glycol, dipropylene glycol, 2,2-bis-(4-hydroxy phenyl) propane, 2,2-bis-(3-hydroxy phenyl)propane, 2,2-bis-(2-hydroxy phenyl)propane, 2,2-bis-(3-hydroxy phenyl)propane, 2,2-bis(5-hydroxy phenyl)propane, Bisphenol A, ethoxylated Bisphenol-A, bis-(4-hydroxy phenyl)methane, 1,1-bis-(4-hydroxy phenyl)ethane, cis-1,4-dihydroxy-cyclohexane, trans-1,4-dihydroxy cyclohexane, cis-1,2-dihydroxy-cyclohexane, trans-1,2-dihydroxy-cyclohexane, trans-1,3-dihydroxy-cyclohexane, cis-1,3-dihydroxy-cyclohexane, and combinations thereof, with a cyclic alkylene carbonate selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, and combinations thereof, in the presence of a first catalyst of an alkali carbonate to form a polyalkoxy diol; contacting the polyalkoxy diol with an additional amount of cyclic alkylene carbonate in the presence of a second catalyst of an alkali alkoxide to form a mixture; polycondensing the resulting mixture with a dicarboxylic acid and an anhydride selected from the group consisting of maleic anhydride, trimellitic anhydride, n-dodecenylsuccinic anhydride, 2-dodecenylsuccinic anhydride, 2-undecenylsuccinic anhydride, and combinations thereof, the diacid and the anhydride utilized in a combined amount of from about 0.90 mole equivalents to about 1.1 mole equivalents; and recovering an unsaturated polyester.