Patent ID: 6692893
Filing Date: 2004-02-17
Classification: G03F,Y10S

Abstract:
An onium salt of the following general formula (1): wherein R1 is a substituted or unsubstituted aryl group of 6 to 14 carbon atoms, R2 which may be the same or different is hydrogen or a substituted or unsubstituted, straight, branched or cyclic alkyl group of 1 to 6 carbon atoms, R0 is a hydroxyl, alkoxy, halogen or nitro group, p is 1 or 2, q and r each are 0, 1 or 2, R3 which may be the same or different is a substituted or unsubstituted, straight, branched or cyclic alkyl group of 1 to 10 carbon atoms or substituted or unsubstituted aryl group of 6 to 14 carbon atoms, M is a sulfur or iodine atom, and â€œaâ€  is equal to 3 when M is sulfur and equal to 2 when M is iodine.