A method of preventing hydration of 4-hydroxy-4'-isopropoxydiphenyl sulfone characterized by wet pulverizing the sulfone in water in the presence of a diphenyl sulfone derivative represented by general formula (I): (wherein R¹ represents hydrogen or lower alkyl; R² and R³ represent each independently lower alkyl; and n and m represent each an integer of 0, 1 to 4, provided when R¹ is hydrogen, not both of m and n are 0 at the same time). A highly sensitive recording paper free from scumming can be produced by using a dispersion of a developer comprising the above sulfone.
一种防止
4-羟基-4'-异丙氧基二苯砜水合的方法,其特征在于在通式(I)代表的
二苯砜衍
生物存在下,在
水中湿法粉碎该砜:(其中R¹代表氢或低级烷基;R²和R³各自独立地代表低级烷基;n和m各自代表0、1至4的整数,条件是当R¹为氢时,m和n不能同时为0)。通过使用包含上述砜的显影剂的分散体,可以生产出无浮渣的高灵敏度记录纸。