METHOD OF PRODUCING AROMATIC POLYESTERS Russian patent published in 2010 - IPC C08G65/40 C08G75/20 

FIELD: chemistry.

SUBSTANCE: invention relates to aromatic polyesters which are used as structural polymer materials in aviation, space, radio-electronic, automobile and other industries. The invention describes a method of producing an aromatic polyester through nucleophilic substitution of equimolecular amounts of phenolphthalein or a mixture of diphenylolpropane and phenolphthalein in molar ratio between 90:10 and 1:99 with 4,4¹-dichlorodiphenyl sulfone or in a mixture with 4,4¹-bis-(chlrophenylsulfonyl)diphenyl in molar ratio between 99:1 and 1:99 in a medium of aprotic solvent at 165-175°C in the presence of an alkaline agent. The alkaline agent consists of K₂CO₃ with an additive of 0.5-5.0 mol % of an equimolecular mixture of Na₂S-9H₂O and Al₂O₃ or SiO₂ per 1.0 mole of K₂CO₃. Further, a copolymer is deposited in water and then dried.

EFFECT: method enables to shorten synthesis time and obtain a quality product with a high glass transition point and oxygen index.

1 cl, 2 dwg, 9 ex