Patent ID: 8633022

Claim:
A process for producing a hydrogel comprising the step of mixing water and benzamide derivative represented by Formula (1): wherein k1 represents an integer of 0 to 4; m1 represents an integer of 1 to 100; and n1 represents an integer of 1 to 6; R 1 represents a hydrocarbon group having 8 to 22 carbon atoms in which the hydrocarbon group is bonded to an oxygen atom and the oxygen atom is bonded to the adjacent ring of said derivative; R 2 represents H or a hydrocarbon group having 1 to 22 carbon atoms in which the hydrocarbon group is bonded to an oxygen atom and the oxygen atom is bonded to the adjacent ring of said derivative; R 3 represents H or a hydrocarbon group having 1 to 22 carbon atoms and a terminal oxygen atom which is bonded to an adjacent phenyl ring; and R 2 and R 3 are not H at the same time.