| 摘要 |
<p>A composition comprising an aromatic copolyestercarbonate having flexural modulus, flexural yield and secondary transition temperature improvement over a corresponding aromatic polycarbonate effective amount of ester units of the structure
<Chemistry id="chema01" num="0001"><Image id="ia01" he="52" wi="124" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry><Chemistry id="chema02" num="0002"><Image id="ia02" he="56" wi="125" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry><!-- EPO <DP n="2"> -->or mixtures of the above two structures wherein R, and R, are the same or different and are alkyl of one to six carbon atoms, inclusive, cycloalkyl of four to seven carbon atoms, inclusive, phenyl, one to three alkyl substituted phenyl each alkyl having one to three carbon atoms, inclusive, and R, and R, taken together with the nitrogen to which they are attached form a ring of four to six carbon atoms, inclusive, or carbazole.</p> |
