Plasticizers for dye-donor element used in thermal dye transfer

Abstract

This invention relates to a dye-donor element for .Iadd.resistive head .Iaddend.thermal dye transfer comprising a support having thereon a dye layer comprising an image dye in a polymeric binder, and wherein the dye layer also contains a polymeric plasticizer having a Tg less than about 25° C., the plasticizer comprising ##STR1## wherein: R and R 1 each independently represent a substituted or unsubstituted linear or branched alkylene, phenylene or cycloalkylene group of from 1 to about 12 carbon atoms; and n is an integer selected so that the plasticizer has a polystyrene equivalent weight average molecular weight of from about 18,000 to about 300,000.

What is claimed is: 
     
       1. A dye-donor element for .Iadd.resistive head .Iaddend.thermal dye transfer comprising a support having thereon a dye layer comprising an image dye in a polymeric binder, said dye layer also containing a polymeric plasticizer having a Tg less than about 25° C., said plasticizer comprising ##STR9## wherein: R and R 1  each independently represent a substituted or unsubstituted linear or branched alkylene, phenylene or cycloalkylene group of from 1 to about 12 carbon atoms; and n is an integer selected so that the plasticizer has a polystyrene equivalent weight average molecular weight of from about 18,000 to about 300,000.   
     
     
       2. The element of claim 1 wherein said plasticizer is present at a concentration of from about 2 to about 25% by weight of said dye layer. 
     
     
       3. The element of claim 1 wherein R is --(CH 2 )--CH(CH3)--. 
     
     
       4. The element of claim 1 wherein R 1  is --(CH 2 ) 8  --. 
     
     
       5. The element of claim 1 wherein the polystyrene equivalent weight average molecular weight of said plasticizer is about 27,000. 
     
     
       6. A process of forming a dye transfer image comprising: a) imagewise-heating .Iadd.by means of a resistive head .Iaddend.a dye-donor element comprising a support having thereon a dye layer comprising a dye dispersed in a binder, and   b) transferring a dye image to a dye-receiving element to form said dye transfer image,   wherein said dye layer also contains a polymeric plasticizer having a Tg less than about 25° C., said plasticzer comprising ##STR10## wherein: R and R 1  each independently represent a substituted or unsubstituted linear or branched alkylene, phenylene or cycloalkylene group of from 1 to about 12 carbon atoms; and   n is an integer selected so that the plasticizer has a polystyrene equivalent weight average molecular weight of from about 18,000 to about 300,000.   
     
     
       7. The process of claim 6 where said plasticizer is present at a concentration of from about 2 to about 25% by weight of said dye layer. 
     
     
       8. The process of claim 6 wherein R is --(CH 2 )--CH(CH3)--. 
     
     
       9. The process of claim 6 wherein R 1  --(CH 2 ) 8  --. 
     
     
       10. The process of claim 6 wherein the polystyrene equivalent weight average molecular weight of said plasticizer is about 27,000. 
     
     
       11. A .Iadd.resistive head .Iaddend.thermal dye transfer assemblage comprising: a) a dye-donor element comprising a support having thereon a dye layer comprising an image dye dispersed in a polymeric binder, and   b) a dye-receiving element comprising a support having thereon a dye image-receiving layer, said dye-receiving element being in superposed relationship with said dye-donor element so that said dye layer is in contact with said dye image-receiving layer, wherein said dye layer also contains a polymeric plasticizer having a Tg less than about 25° C., said plasticizer comprising ##STR11## wherein: R and R 1  each independently represent a substituted or unsubstituted linear or branched alkylene, phenylene or cycloalkylene group of from 1 to about 12 carbon atoms; and     n is an integer selected so that the plasticizer has a polystyrene equivalent weight average molecular weight of from about 18,000 to about 300,000.   
     
     
       12. The assemblage of claim 11 wherein said plasticizer is present at a concentration of from about 2 to about 25% by weight of said dye layer. 
     
     
       13. The assemblage of claim 11 wherein R is --(CH 2 )-- CH(CH3)--. 
     
     
       14. The assemblage of claim 11 wherein R 1  is --(CH 2 ) 8  --. 
     
     
       15. The assemblage of claim 11 wherein the polystyrene equivalent weight average molecular weight of said plasticizer is about 27,000.