Method of making polycarbonate

Details Method of making polycarbonate Method of making polycarbonate

2011-07-26

2011-07-26

Boykin, Terressa M (Department: 1765)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S198000, C548S472000

Reexamination Certificate

active

07985824

ABSTRACT:
A method of making a polycarbonate is described. The method comprises reacting an activated diaryl carbonate and a dihydroxy compound at a reaction temperature in a reactor to form a reaction mixture wherein the reactor comprises a heated cover and an open space between the cover and the reaction mixture. The dihydroxy compound comprises a vapor pressure greater than or equal to 0.01 kiloPascals at the reaction temperature and the temperature of the open space in the reactor, the temperature of the cover, or the temperature of the open space and the cover is greater than or equal to the melt temperature of the monomer having the highest melt temperature.

REFERENCES:
patent: 7041775 (2006-05-01), Martinez et al.
patent: 7495064 (2009-02-01), Domingo et al.
patent: 2008/0287640 (2008-11-01), Belfadhel et al.
patent: 2009/0105443 (2009-04-01), Brack et al.

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