Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2005-05-31
2005-05-31
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C502S164000, C528S198000
Reexamination Certificate
active
06900283
ABSTRACT:
Stable, homogeneous melt solutions are prepared at temperatures of 200° C. or less from solid mixtures comprising at least one diaryl carbonate, at least one high melting dihydroxy aromatic compound (mp>200° C.), a transesterification catalyst, and optionally a lower melting dihydroxy aromatic compound. Thus, a stable, homogeneous melt solution is obtained from a solid mixture comprising 4,4′-biphenol (mp 282-284° C.) at a temperature of about 200° C. using either diphenyl carbonate or bis(methyl salicyl) carbonate as the diaryl carbonate component. It is shown that formation of the stable, homogeneous melt solutions requires the presence of the transesterification catalyst when substantial amounts of the high melting dihydroxy aromatic compound are present in the initial solid mixture. Solid mixtures comprising a variety of high melting bisphenols; 4,4′-biphenol; 3,3,3,3′-tetramethylspirobiindanbisphenol, and 4,4′-sulfonyidiphenol are converted to stable, homogeneous melt solutions at 200° C., a temperature substantially below the melting points of the high melting bisphenols in their pure states.
REFERENCES:
patent: 5717057 (1998-02-01), Sakashita et al.
patent: 0673959 (1995-09-01), None
patent: 0703262 (1996-03-01), None
patent: WO0138418 (2001-05-01), None
Copending U.S. patent application Ser. No. 10/167901 , filed Jun. 12, 2002, of Patrick J. McCloskey et al. entitled “Method of Making an Aromatic Polycarbonate”.
PCT Search Report.
Longley Kathryn Lynn
McCloskey Patrick Joseph
Ramesh Narayan
Boykin Terressa
Caruso Andrew J.
General Electric Company
Patnode Patrick K.
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