Process for preparation of polyesters

Details Process for preparation of polyesters Process for preparation of polyesters

1974-07-11

1976-10-05

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75R, C08G 6326, C08G 6330

Patent

active

039843793

ABSTRACT:
According to this invention, during the formation of a fiber-forming polyester by the reaction of a dicarboxylic acid or its functional derivative with a glycol, an aromatic ortho-ester such as hexaphenyl ortho terephthalate is added to the molten polyester whereby a fiber-forming polyester of a low content of free carboxyl groups and diethylene glycol units is prepared. Moreover, the reaction rate of the polycondensation is greatly increased by selecting and using a suitable aromatic ortho-ester and thus there can be obtained a fiber-forming polyester of a very high molecular weight.

REFERENCES:
patent: 3444141 (1969-05-01), Shima
patent: 3518226 (1970-06-01), Wood
patent: 3701757 (1972-10-01), Lazarus et al.
patent: 3714125 (1973-01-01), Shima et al.
patent: 3787370 (1974-01-01), Shima et al.

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