Abstract: The water-and-oil repellant composition of the invention including an aqueous dispersion of a pyrazole blocked hydrophobic polyisocyanate containing a pyrazole blocked hydrophobic polyisocyanate represented by the following formula (I) and a non-ionic surface active agent, and a water-and-oil repellant component having a perfluoroalkyl group with 6 carbon atoms or less is provided: R(—NH—CO—Z)m??(I) [in the formula (I), m represents an integer of 2 or more; R represents a residue after an “m” number of isocyanate groups have been removed from a polyisocyanate compound with an “m” number of isocyanate groups; Z represents a residue, which is the same or different from each other, after hydrogen atoms have been removed from active hydrogen-containing compounds that are capable of reacting with an isocyanate group, and at least two of the Z's are a pyrazole groups represented by the formula (II): {in the formula (II), n represents an integer of from 0 to 3; if n is 1 or higher, R1, which is the sa

Abstract: A process for producing 2,4?-dihydroxydiphenylsulfone which comprises separating 4,4?-dihydroxydiphenylsulfone by crystallization from a mixture containing 4,4?-dihydroxydiphenylsulfone, 2,4?-dihydroxydiphenylsulfone, phenolsulfonic acid and phenol which is obtained by dehydration of phenol and sulfuric acid or phenolsulfonic acid to obtain a mixture having a content of 2,4?-dihydroxydiphenylsulfone greater than the content of 4,4?-dihydroxydiphenylsulfone, crystallizing 2,4?-dihydroxydiphenylsulfone by adjusting the composition of the solvent of the obtained mixture so that the ratio of the amounts by weight of phenol to water is 10:90 to 90:10, and separating 2,4?-dihydroxydiphenylsulfone by filtration; and a process as described above in which the filtrate obtained by the filtration is used as the raw material for the hydration.

Abstract: A process for producing 2,4?-dihydroxydiphenylsulfone which comprises separating 4,4?-dihydroxydiphenylsulfone by crystallization from a mixture containing 4,4?-dihydroxydiphenylsulfone, 2,4?-dihydroxydiphenylsulfone, phenolsulfonic acid and phenol which is obtained by dehydration of phenol and sulfuric acid or phenolsulfonic acid to obtain a mixture having a content of 2,4?-dihydroxydiphenylsulfone greater than the content of 4,4?-dihydroxydiphenylsulfone, crystallizing 2,4?-dihydroxydiphenylsulfone by adjusting the composition of the solvent of the obtained mixture so that the ratio of the amounts by weight of phenol to water is 10:90 to 90:10, and separating 2,4?-dihydroxydiphenylsulfone by filtration; and a process as described above in which the filtrate obtained by the filtration is used as the raw material for the hydration.