PROCESS FOR PREPARING POLYCARBONATES

• Main Authors: HAUPT, HEINRICH, VERNALEKEN, HUGO, BINSACK, RUDOLF, REESE, ECKART
• Format: Patent
• Language: English
• Published: 25.10.1977
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONDUCTORS; ELECTRICITY; INSULATORS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; THEIR PREPARATION OR CHEMICAL WORKING-UP

1432494 Phenol derivatives BAYER AG 9 Nov 1973 [9 Nov 1972] 52042/73 Heading C2C [Also in Division C3] Bisphenol-F-bisphenylcarbonate (I) is made (Example 2a) by adding phenyl chloroformate to a 2-phase solution of bisphenol-F, CH 2 Cl 2 , water, NaOH, and (C 2 H 5 ) 3 N at 25‹ C., and recovering. 4,41 - Dihydroxydiphenyl - dichloromethanebis-phenyl carbonate (II) is made (Example 2b) by chlorinating (I) in chlorobenzene at 80-100‹ C. in the presence of light, and recovering. Tetra-(4-hydroxyphenyl)-methane (III) is made (Example 2c) by heating (II), phenol, and CH 3 COONa at 50-170‹ C., distilling off excess phenol, boiling with ethanolic KOH, dissolving in water, precipitating (III) with diluted HCl, and recovering. Hexaphenyl orthoterephthalate is made (Example 3a) by adding a chlorobenzene solution of p-bis-trichloromethyl-benzene to a pyridine solution of phenol, heating to 100‹ C., and recovering. Tetra - [4 - (dimethyl - 41 - hydroxyphenyl)- methylphenoxy]methane is made (Example 5a) by fusing tetraphenyl orthocarbonate and 2,2- bis - (4 - hydroxyphenyl)-propane in the absence of oxygen, distilling off the phenol under reduced pressure at 180-200‹ C., cooling, powdering, and recovering.