| 摘要 |
<p>It is to provide a useful fluoropolymer excellent in transparency and durability to a short wavelength light (an ArF excimer laser having an irradiation wavelength of 193 nm and a F2 excimer laser having an irradiation wavelength of 157 nm) as e.g. a pellicle material. A pellicle wherein a polymer (I) to be used for a pellicle membrane and/or an adhesive is a polymer essentially containing the following unit (1). The unit (1) is a unit containing a fluorine atom, wherein a chain forming the polymer main chain comprises a carbon atom and an etheric oxygen atom, at least one carbon atom forming the main chain is a carbon atom forming a cyclic group, and at least one etheric oxygen atom forming the main chain is an oxygen atom forming no cyclic group. For example, a unit represented by the following formula (A1) (wherein n is 1 or 2, R F1 is -F or -CF 3 , and R F2 is -F or a C 1-5 perfluoroalkyl group):</p> |
