Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-12-04
1977-03-22
Gotts, Lewis
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260 47XA, C07C 6808
Patent
active
040137023
ABSTRACT:
The free and bonded residual phenol content of oligocarbonates prepared by transesterification between a diol and a diphenyl carbonate is substantially reduced by a process comprising (i) introducing water into the oligocarbonate in the liquid state at an elevated temperature under reduced pressure and (ii) purging the mixture with an inert gas to effect degassing. The purified oligocarbonates are particularly resistant to yellowing.
REFERENCES:
patent: 3213060 (1965-10-01), Jackson et al.
patent: 3470133 (1969-09-01), Ohme
patent: 3668181 (1972-06-01), Oxenrider
Cartier Jean-Pierre L.
Senet Jean-Pierre G.
Gotts Lewis
Phillips D. R.
Societe Nationale des Poudres et Explosifs
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