Process for the production of aromatic polyesters

Details Process for the production of aromatic polyesters Process for the production of aromatic polyesters

C - Chemistry, Metallurgy

08

G

402/188, 400/764

C08G 63/18 (2006.01) C08G 63/60 (2006.01) C08G 63/87 (2006.01)

Patent

CA 1220889

RC-1547-m028 PROCESS FOR THE PRODUCTION OF AROMATIC POLYESTERS ABSTRACT The production of oxybenzoyl polyesters is facilitated by the incorporation of a phosphite, particularly an organic phos- phite, during the production enabling the production of molded articles from these polyesters of improved appearance and excellent properties. BACKGROUND OF THE INVENTION The present invention relates to an improved process for the production of copolyesters. More particularly, it relates to a process for the production of oxybenzoyl polyesters of aromatic dicarboxylic acids, bisphenols and p-hydroxybenzoic acid compounds as the starting materials. It is known that such polyester resins can be produced by various polymerization processes including suspension polymeri- zation and bulk polymerization. Of these, the bulk polymerization process is perhaps the most desirable process in terms of economy. However, since the aromatic polyesters have a high melting point as compared with aliphatic polyesters, such as polyethylene tereph- thalate, a higher temperature is required to maintain the aromatic polyesters at their molten state. Consequently, the polymers are often colored and deteriorated in performance. Much effort has therefore been expended on the develop ment of a process which eliminates the disadvantages discussed above and provides a polyester molding material from which articles of pleasing and uniform appearance and properties can be obtained. THE INVENTION According to the present invention, there can be pro- duced a polymer having an extremely low degree of coloration and - 1 -

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