| 摘要 |
PURPOSE:To prevent offset of a printing ink from occuring, by providing a coating mateial consisting of specified quantities of cellulose nitrate having a specified degree of nitrification, an ester and an alcohol or a derivative thereof, and the remainder of water. CONSTITUTION:The coating material consists of 5-25wt% of cellulose nitrate having a degree of nitrification of 10.7-12.2, 10-30wt% of an ester, 10-30wt% of an alcohol or a derivative thereof and the remainder of water. The quantity of cellulose nitrate needs to be 5-25wt% from the viewpoint of offsetting preventing performance. The ester has a function of dissolving cellulose nitrate, it may be an acetate such as ethyl acetate, methyl acetate or butyl acetate, and the quantity thereof needs to be 10-30wt%. The quantity of the alcohol needs to be 10-30wt%. The coating material is quickly dried to form a thin uniform film, which can prevent the offset. |
