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Ultraviolet transmitting fluoropolymer and pellicle comprising said polymer
   
Document Number
US Patent 7442815
Issued Date
October 28, 2008
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Abstract
A pellicle which is excellent in transmittance and durability against short wavelength light, and which can be used for photolithography by using e.g. a KrF excimer laser, is provided.A pellicle for exposure to a light having a wavelength of at most 200 nm, which comprises a frame and a pellicle membrane bonded to the frame by means of an adhesive, wherein the pellicle membrane and/or the adhesive comprises a polymer containing repeating units represented by the following formula (1): ##STR00001## wherein Q represents a C.sub.1-3 polyfluoroalkylene group having a linear structure, or a group having at least one atom selected from hydrogen atoms and fluorine atoms in such a polyfluoroalkylene group substituted by a substituent comprising a polyfluoroalkyl group which may contain an ethereal oxygen atom, or the like, and X represents a hydrogen atom, a fluorine atom or a C.sub.1-3 polyfluoroalkyl group which may contain an ethereal oxygen atom.
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Number of Claims:
7
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Published
October 28, 2008
Application Number
11/061,689
Filed
February 22, 2005
US Classification
549/504  
Int'l Classification
C07D   307/77   (20060101)  
Examiner
Priority Data
Aug 21, 2002 [JP] 2002-240759
USPTO Field of Search
549/504  
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