Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-09-24
1976-01-20
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 304R, 260 328R, 260 342, 260 47C, C08G 6340, C08L 6702
Patent
active
039337138
ABSTRACT:
The method for preparing aromatic polyesters consists in the interaction between bis-phenols and dihalogenanhydrides of aromatic dicarboxylic acids taken at a molar ratio from 0.9 to 1.1, at a temperature from -10 to +30.degree.C, in the presence of alkali taken in the quantity of 2 - 2.5 moles per mole of bis-phenols, in a system water-organic liquid, at their volume ratio from 0.2 to 5; said organic liquid is capable of dissolving dihalogenanhydrides of dicarboxylic acids, is chamically inactive towards the starting components, and is miscible with water in the quantity of not less than 25 per cent. The process is carried out in the presence of water-soluble salts of metals standing in the first and the second groups of the Periodic System, taken either separately or in combination, in the quantity from 5 to 45 per cent by weight with respect to the weight of water taken for the reaction. The reaction mixture which is formed, is emulsion containing the end product. The emulsion is ready for direct use.
The end product in the form of solution can also be obtained. To that end the reaction mixture containing the end product is allowed to stand to separate into two phases, namely into an aqueous and an organic phase. The organic phase is a solution of the end product in a mixture with the organic liquid and water. The settled out phases are separated. The obtained solution is ready for direct use.
The end product can also be prepared in the form of powder, for which purpose the reaction mixture, containing the end product is mixed with water in the quantity from 30 to 200 per cent of the volume of the reaction mixture. The obtained suspension is passed through a filter to isolate the end product.
The proposed method provides for the preparation of high-molecular aromatic polyesters at yields to 99.7 per cent.
REFERENCES:
patent: 3028364 (1962-04-01), Conix et al.
patent: 3216970 (1965-11-01), Conix et al.
patent: 3234168 (1966-02-01), Hare
patent: 3828006 (1974-08-01), Thomas
Kudim Tatyana Vladimirovna
Sokolov Lev Borisovich
Czaja Donald E.
Fletcher H. H.
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