PROCESS FOR PREPARING POLYCARBONATES
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...
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Main Authors | , , , |
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Format | Patent |
Language | English |
Published |
25.10.1977
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Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | Application Number: CA19730183947 |