发明名称 |
CONTINUOUS PROCESS FOR PRODUCING POLY(TRIMETHYLENE TEREPHTHALATE) |
摘要 |
A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a prepolymerizer. Bis-3-hydroxypropyl terephthalate and the low molecular weight polyesters are continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a first stream of gaseous by-products. Poly(trimethylene terephthalate) prepolymer having a relative viscosity of at least about 5 is continuously withdrawn from the prepolymerizer and continuously fed to a final polymerizer, where it is continuously polymerized to form a higher molecular weight poly(trimethylene terephthalate) and a second stream of gaseous by-products. Higher molecular weight poly(trimethylene terephthalate) having a relative viscosity of at least about 17 is continuously withdrawn from the final polymerizer.
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申请公布号 |
CA2396465(C) |
申请公布日期 |
2010.01.26 |
申请号 |
CA20002396465 |
申请日期 |
2000.08.10 |
申请人 |
E.I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
GIARDINO, CARL J.;GRIFFITH, DAVID B.;HO, CHUNGFAH HOWARD;HOWELL, JAMES M.;WATKINS, MICHELLE HOYT;DUFFY, JOSEPH JAMES |
分类号 |
C08G63/183;C08F2/00;C08G63/78 |
主分类号 |
C08G63/183 |
代理机构 |
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