Monomer solution for producing polycarbonate

Details Monomer solution for producing polycarbonate Monomer solution for producing polycarbonate

2007-09-28

2009-10-13

Boykin, Terressa M (Department: 1796)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C422S051000, C422S051000, C422S062000, C422S075000, C436S075000, C436S079000, C436S085000, C436S095000, C436S106000, C436S111000, C528S198000

Reexamination Certificate

active

07601794

ABSTRACT:
A non-reactive monomer mixture is formed from a dihydroxy component having one or more dihydroxy compounds dissolved in a melted diaryl carbonate. The dihydroxy component has less than 600 ppb alkali metal, an acid stabilizer, or both less than 600 ppb alkali metal and an acid stabilizer. The dihydroxy compounds of the dihydroxy component and the diaryl carbonate are present in a mole ratio of from 0.9 to 1.1. The monomer mixture is at a temperature between the saturation point of the monomer mixture and the highest melting temperature of the individual dihydroxy compounds. The non-reactive monomer mixture can be stored and transported and then polymerized to form polycarbonate upon addition of a catalyst.

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