Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-05-17
1977-10-18
Phillips, Delbert R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260 47XA, 260 775D, C07C14914, C08G 6362
Patent
active
040545970
ABSTRACT:
The present invention relates to an interfacial process for the production of polycarbonates having terminal, aliphatically bonded hydroxyl groups by reacting predominantly dihydric alcohols with phosgene or chlorocarbonic acid esters of predominantly dihydric alcohols and/or phenols using alkali liquors as HCl-binding agents and in the presence of inert solvents, the process according to the invention being distinguished by the fact that concentrated, aqueous alkali liquors are used as the HCl-binding agents and thiodiglycol, optionally mixed with additional monohydric and polyhydric alcohols, is used as the dihydric alcohol. The present invention further relates to the new polycarbonates produced according to the novel process and to the use of these new polycarbonates for the production of polyurethane plastics.
REFERENCES:
patent: 3046255 (1962-07-01), Strain et al.
patent: 3275674 (1966-09-01), Bottenbruch et al.
patent: 3646102 (1972-02-01), Kobayashi et al.
patent: 3894974 (1975-07-01), Hunter et al.
patent: 3966788 (1976-06-01), Senet et al.
Buysch Hans-Josef
Krimm Heinrich
Schnell Hermann
Bayer Aktiengesellschaft
Colen Frederick H.
Harsh Gene
Phillips Delbert R.
Pope Lawrence S.
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