| abstract |
The present invention describes novel reaction media for electron donating and electron accepting components in color change compositions. The compound has the formula (VI): □R1 and R2 are independently selected from optionally substituted straight or branched alkyl, alkenyl, alkoxy, aryl and alkyl aryl groups having 5 to 22 carbon atoms. X1 and X2 are independently selected from -OC(O)-, -CO2- and O; Y1 and Y2 are independently selected from hydrogen, halogen, R1, -OR1; y is independently 0 or 1; and suitably R1X1 The group is independently ortho or meta to the -X2R2 group. These compounds are suitable for use in ink compositions, writing instruments containing the compounds, and pharmaceutical and industrial applications in which temperature sensitive color changes may be desired. |