| http://www.w3.org/ns/prov#value | - The transesterification is conducted by using a lower alcohol ester of terephthalic or 2,6-naphthalenedicarboxylic acid and 1,4-butanediol at a molar ratio of between 1:1 and 1:2 under normal pressure at a temperature of 150??? to 230??? C. while continuously removing a lower alcohol, such as methanol, that is formed.
|
