Document BRaDZgDkO2wGG34D5OLkw8MwL

Fluorine compounds having both a hydrofluoroether group and a reactive group have been used extensively as antifouling agents for hard coating agents. A hard coating agent is a coating agent for the purpose of preventing scratches on various surfaces. After coating, this coating agent is cured by UV irradiation to form a film. A fluorine compound having both a hydrofluoroether group and a reactive group is used by being added to the hard coating agent. After coating, the hard coating agent to which this fluorine compound is added exhibits both the function of preventing stains such as fingerprints, water stains and adhesives, and the function of low friction. Oil repellency and a low coefficient of friction are required to prevent fingerprints and smudges. There is no substitute substance because there is no oil-repellent substance other than fluorine-based compounds in the world. (table 1) table 1 compound name The fluorine compound silicon compound Urethane compound acrylic compound epoxy compound polyethylene polypropylene ABS Nylon 66 Polyimide polyamide oil repellency (hexadecane contact angle) 69 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) 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) 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) Also, the fluorine compound has an optically low refractive index. Reflected light can be reduced by coating optical parts such as lenses and transparent films with a hard coating agent containing a fluorine-based compound to a thickness of about 0.1 m. Reducing reflected light results in a 3-5% improvement in transmitted light transmittance. Other various resins have a high refractive index and cannot achieve such a reflected light reduction rate. compound name Fluorine compound Polycarbonate PET PMMA polystyrene silicon resin refractive index 1.35 1.59 1.66 1.49 1.66 1.43 Light transmittance (by wavelength) when glass is coated with a fluorine compound