Water repellent agents for textiles include F-containing water repellent and non-F-containing water repellent. Due to a small atomic radius and high electronegativity of fluorine atom, F-containing water repellent agents have suitable properties for water repellent materials, such as non-adhesiveness, water repellency, oil repellency, and heat resistance. However, F-containing water repellent agents have a great disadvantage of environmental concern from PFC (perfluorinated compound). Herein, we wish to report eco-friendly urethane-based non-F-containing water repellent agents in order to replace F-containing water repellent agents. The characteristic of the urethane-based non-F-containing water repellent agents is that it does not contain PFC and is excellent in repellency against contaminants as well as water. It exhibits excellent water repellency as compared with conventional wax, silicone and polyacrylic water repellent agents. In addition, it has a good process stability and excellent washing durability in natural drying conditions. Non-F-containing water repellent agents were prepared from isocyanurate trimer (1.0 equiv) and STS-OH or STO-OH (3.0 equiv) in the presence of Ti catalyst (1 mol %) in NEP (N-ethylpyrrolidone) for 15 h at 50 °C.