Patent ID: 7438995
Filing Date: 2008-10-21
Classification: G03F

Abstract:
1. A method comprising causing a source to emit electromagnetic radiation in the wavelength range from 150 nanometers to 260 nanometers; disposing a target surface in the path of at least a portion of said electromagnetic radiation in such a manner that at least a portion of said target surface will be thereby illuminated; and, interposing in the path of at least a portion of said electromagnetic radiation between said target surface and said source a shaped article comprising a fluoropolymer exhibiting an absorbance/micrometer ≦1 at wavelengths from 150 to 260 nm and a heat of fusion of <1 J/g said fluoropolymer being a homopolymer selected from group A or copolymers from groups B, C, and D wherein group A consists of the homopolymer of CH group B consists of copolymers comprising >25 mole % of monomer units derived from CF group C consists of copolymers comprising >10 mole % of monomer units derived from CH wherein R group D consists of copolymers comprising 40 to 60 mole % of monomer units derived from a monomer represented by the formula in combination with monomer units derived from vinylidene fluoride and or vinyl fluoride wherein G and Q are independently F (but not both F), H, R f , or —OR f wherein R f is a linear or branched C1 to C5 fluoroalkyl radical having the formula C n F 2n−y+1 H y wherein the number of hydrogens is less than or equal to the number of fluorines, no more than two adjacent carbons atoms are bonded to hydrogens, and ether oxygen can replace one or more of the carbons providing that at least one of the carbons adjacent to any ether oxygen is perfluorinated.