Patent ID: 7300743
Filing Date: 2007-11-27
Classification: G03F

Abstract:
1. A process for preparing a liquid organic composition characterized by an absorbance/micrometer of <1 at wavelengths from 140 to 260 nm, comprising subjecting to treatment with one or more means for extracting one or more photochemically active species, a liquid compound selected from the group consisting of: i) cyclic, linear, or branched hydrofluorocarbons having 2 to 10 carbon atoms in which there are more fluorines than hydrogen, no runs of adjacent C—H bonds longer than two (CH—CH), no runs of adjacent C—F bonds longer than 6 (CF—CF—CF—CF—CF—CF), and no —CH ii) X—R iii) C iv) CF v) F[CF(CF vi) F[CF(CF vii) HCF viii) cyclic, linear, or branched hydrofluorocarbon amines and ether-amines in which there are more fluorines than hydrogens, no runs of hydrogen longer than two (CH—CH), no —CH ix) XR at least until the desired concentration of said one or more photochemically active species is achieved; wherein said one or more photochemically active species comprises moisture and oxygen and the desired concentrations are below 20 parts per million and below 90 parts per million, respectively.