Document w9rO36KL0Kv7oQ9j4aVzbnNJ

Waterproof and antifouling agent for leather and silk products Water and oil repellent sprays used for shoes and sandals made of leather or canvas must have not only water repellency but also oil repellency from the standpoint of stain prevention. Oily substances such as cooking sauces and salad dressings soak into leather and fibers, causing stains. If leather products or silk Japanese clothes get dirty, cleaning is difficult and time-consuming. In some cases, these stains cannot be removed even by cleaning, and the product cannot be used. In order to avoid such troubles, it is essential to coat the surface with an oil-repellent fluorinebased substance. Various resins such as acrylic and urethane resins, as well as silicone-based compounds, can be considered as substitutes for PFAS in this application, but compounds other than fluorinebased compounds do not have oil repellency and cannot prevent stains. In addition, it cannot be used as a substitute for this application because of its poor water repellency. Oil repellency data compound name Fluorine compound silicon compound Urethane compound acrylic compound epoxy compound oil repellency (hexadecane contact angle) 68 15 Not measurable (contact angle of 10 degrees or less) Not measurable (contact angle of 10 degrees or less) Not measurable (contact angle of 10 degrees or less) Salad oil permeation prevention performance* * Form a 0.1 film on the silk, leave salad oil on it for 10 minutes and observe the presence or absence of permeation In addition, descriptions of fluorine-based water and oil repellency can also be found in the following patent documents. Reference: Japanese Patent Publication 2015-165056