| 摘要 |
1,210,598. Polyesterification catalyst. FMC CORP. 17 April, 1968 [21 June, 1967], No. 18203/68. Heading C3R. In the production of poly-(ethylene terephthalate) from dimethyl terephthalate and ethylene glycol by ester interchange and polycondensation, the polycondensation catalyst is nickel, aluminium, cadmium, manganese or lead borate. The ester interchange catalyst may be lithium hydride or zinc acetate. |
