Heat sensitive recording material

#The present invention relates to a material suitable for heat sensitive recording papers, and more particularly to a heat sensitive recording material characterized by containing a specific developer capable of bringing a color forming substance into color images by heating.

#The heat sensitive recording paper is a recording material in which a heat sensitive layer which can be developed a color by heating is applied to a surface of a substrate such a paper. The recording process is conducted by using a printer such as a thermal printer. The paper is widely utilized in the field of computers, facsimile telegraphs, calculating machines, and the like.

#The heat sensitive layer is composed of a composition containing a color forming substance, a developer capable of bringing the color forming substance into color images and a binder, and it is said that the developer is the most influential component to properties of the heat sensitive recording material among the above three components. Accordingly the utility of the heat sensitive recording materials depends on the properties of the used developer.

#______________________________________ Dispersion (A) Crystal Violet lactone 7 parts 10% aqueous solution of PVA 10 parts (polyvinyl alcohol commercially available under the commercial name of "GOHSENOL GL-05" made by Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha) Stearic acid amide 10 parts Calcium carbonate 25 parts Water 60 parts Dispersion (B) Benzyl bis(3-chloro-4-hydroxyphenyl)acetate 25 parts having the formula: ##STR14## 10% aqueous solution of PVA 10 parts Calcium carbonate 25 parts Solution (C) 10% aqueous solution of PVA 110 parts ______________________________________

#The dispersions (A) and (B) and the solution (C) were prepared separately, each of the dispersions (A) and (B) was pulverized by using a sand grinder until average particle sizes of solid matters were from 2 to 3.mu., and the dispersions (A) and (B) and the solution (C) were mixed. The mixture was coated on a paper having a basis weight of 50 g/m.sup.2 so that an amount of coating was 10 g/m.sup.2 on the base of solid and was dried to give a heat sensitive recording paper.

#The physical properties of the obtained heat sensitive recording paper are shown in Table 1.