RECENT PROGRESS IN THE MANUFACTURING PROCESS FOR 4,4'-BIPHENOL DERIVATIVES

4,4'-Biphenol derivatives are very useful for the raw material of polyesters, polycarbonates, polysulfones and polyepoxides. Many manufacturing process have been investigated. In this review, we describe especially recent progress in manufacturing process for two representatives. (1) Some manufacturing process for the 4,4'-biphenol:phenol process, 2,6-di-t-butylphenol process, 4-halophenol process, 4,4'-diisopropylbiphenyl process, 4,4'-dihalobiphenyl process, alkaline fusion process and 4-hydroxycyclohexanone process. (2) Our new process for the 3,3',5,5'-tetramethyl-4,4'-biphenol.