Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1999-05-17
2000-10-24
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528198, C08G 6400
Patent
active
061369454
ABSTRACT:
Polycarbonate produced by melt condensation of a diaryl carbonate and a dihydric phenol in the presence of a basic catalyst to produce an intermediate polycarbonate composition is finished by quenching with both an alkyl tosylate quencher and phosphorous acid. The efficiency of quenching can be measured by UV retention. Surprisingly, although phosphorous acid alone has no impact on the UV retention, the combination of alkyl tosylate quenchers and phosphorous acid provides a significant improvement over the use of the alkyl tosylate quencher alone. Thus, the method of the invention permits a reduction in the amount of alkyl tosylate quencher used, and can achieve superior results which cannot be achieved even by increasing the alkyl tosylate levels.
REFERENCES:
patent: 5210268 (1993-05-01), Fukuoka et al.
patent: 5319066 (1994-06-01), King, Jr.
patent: 5403878 (1995-04-01), Ishiwa et al.
patent: 5418269 (1995-05-01), Ishiwa et al.
patent: 5470938 (1995-11-01), Sakashita et al.
patent: 5606007 (1997-02-01), Sakashita et al.
patent: 5713453 (1998-02-01), Schornhorst et al.
patent: 5717057 (1998-02-01), Sakashita et al.
patent: 5834615 (1998-11-01), Nishihira et al.
Boykin Terressa M.
General Electric Company
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