A dispersion composition containing a urea-urethane (UU) compound as (a) component, and one or more types of coloring inhibitors selected from among a silicate, a carbonate, a sulfate, a phosphate, a metal oxide, a metal hydroxide, a hindered phenol compound, a hindered amine compound and an acetoacetic acid derivative as (b) component, characterized in that one of more components selected from (a) component and (b) component is subjected to a heating treatment, or a developer UU dispersion prepared by using a cellulose derivative and a specific anionic surfactant as a dispersant for the developer UU is subjected to a heating treatment. The above dispersion composition containing a urea-urethane compound allows the improvement of the phenomenon of the lowering with time of the whiteness of an application fluid containing a colorless or pale dye precursor and a urea-urethane compound, and also allow the improvement of the discoloration of a white portion, in particular, the discoloration under a high humidity condition (the resistance to wet discoloration of a white portion] of a thermal recording material manufactured by the use of said application fluid.
一种分散体组合物,含有作为(a)组分的
脲-
氨基甲酸酯(UU)化合物和作为(b)组分的一种或多种类型的着色
抑制剂,这些着色
抑制剂选自
硅酸盐、
碳酸盐、
硫酸盐、
磷酸盐、金属氧化物、
金属氢氧化物、受阻
酚化合物、受阻胺化合物和
乙酰乙酸衍
生物、其特征在于,选自(a)组分和(b)组分中的一种或多种组分经过加热处理,或使用
纤维素衍
生物和特定阴离子表面活性剂作为显影剂 UU 的分散剂制备的显影剂 UU 分散体经过加热处理。上述含有
尿素-
氨基甲酸酯化合物的分散组合物可以改善含有无色或淡色
染料前体和
尿素-
氨基甲酸酯化合物的涂抹液的白度随时间降低的现象,还可以改善使用上述涂抹液制造的热敏记录材料的白色部分的褪色情况,特别是在高湿度条件下的褪色情况(白色部分的抗湿褪色能力)。