Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Thermal transfer ink layer composition for dye-donor element used in sublimation thermal dye transfer
 The present invention relates to a thermal transfer ink layer composition, wherein polyvinylacetal resin and cellulose derivatives are used in a mixture for the binder in the thermal transfer ink layer composition of the sublimation thermal transfer ink ribbon, or the another type of a binder is mixed into the mixture of polyvinylacetal resin and cellulose derivatives and so used therein. As a result, the adhesion between the thermal transfer ink layer and substrate film, and the gradation property of printed images are improved as compared to the case in which the respective binders are used individually. More particularly, the present invention relates to the thermal transfer ink layer composition of the sublimation thermal transfer ink ribbon, which can yield high quality images by means of the aforementioned improvements. 
Hansol Paper Co., Ltd.
B C C C
B41M C09D C08L C08L
inventional inventional inventional additional
Yong-Cheol Eun-Seong Jeong-Seok Tae-Woon Oh-Seung
Shin Kim Seo Cha Kwon