| 摘要 |
69601-70 An improved thermally-responsive record material having improved image retention is disclosed. The invention is an improved thermally-responsive record member, typically a sheet material, bearing a thermally-responsive color-forming composition comprising a chromogenic material, an acidic developer material, and a metal salt of a compound of the formula wherein Ra is selected from -CH=CH, , -(CH2)4, -(CH2)3-, and -CH2-CH=CH-, wherein R1 is selected from hydrogen, halogen, alkyl. oxyalkyl, or NO2 with the proviso that the alkyl groups are of 1-5 carbons, M is a metal selected from Zn, Ca, Sn, Ni, Cu, Al, Co and Mg, and m is an integer corresponding to the valency of the metal M. |
