发明名称 |
Process for preparing copolyesters of terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol exhibiting a neutral hue, high clarity and increased brightness. |
摘要 |
This application relates to a three step process for preparing copolyesters exhibiting a neutral hue, high clarity and increased brightness. The process involves reacting terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol in a feed mole ratio of total glycols to dicarboxylic acid of 1.7:1 to 6.0:1 at a temperature of 240 DEG C to 280 DEG C, and a pressure of 15 psig (200 kPa) to 80 psig (650 kPa) to form an esterification product; adding a polycondensation catalyst and a toner; and polycondensing the product at a temperature of 260 DEG C to 290 DEG c and a reduced pressure to form a high molecular weight copolyester. |
申请公布号 |
ZA9701415(B) |
申请公布日期 |
1997.08.27 |
申请号 |
ZA19970001415 |
申请日期 |
1997.02.19 |
申请人 |
EASTMAN CHEMICAL COMPANY |
发明人 |
VALERIE SUE ADAMS;JAMES EARL HATAWAY;KENNETH ALAN ROBERTS |
分类号 |
C08G63/199;C08G63/20;C08G63/85 |
主分类号 |
C08G63/199 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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