Process for producing polyarylate having low color

Details Process for producing polyarylate having low color Process for producing polyarylate having low color

1991-08-13

1992-11-17

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528176, 528193, 528194, 528480, C08F 600, C08G 6302, C08G 6318

Patent

active

051644789

ABSTRACT:
A process for preparing polyarylates having low color wherein isophthalic acid, terephthalic acid, and bisphenol A are melt polymerized to form a prepolymer, the prepolymer is crystallized, and then further polymerized in the solid state by heating under an inert gas flow, e.g. nitrogen. Crystallization is accomplished by adding the amorphous prepolymer in powder or pellet form to a organic crystallizing medium such as 2-ethoxyethyl acetate or hexyl acetate. This process produces a polymer having low color content. The crystallized polymer may be made amorphous by melting. This amorphous polymer is useful in applications requiring a transparent, colorless plastic.

REFERENCES:
patent: 4485230 (1984-11-01), Yu
patent: 4533720 (1985-08-01), Yu
patent: 4937319 (1990-06-01), Gupta et al.
patent: 4994546 (1991-02-01), Stern et al.
patent: 5004796 (1991-04-01), Vicari et al.
patent: 5070176 (1991-12-01), Strand

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