Patent ID: 6358899
Filing Date: 2002-03-19
Classification: C11D,G03F

Abstract:
A method for cleaning a glass substrate or photomask which comprises contacting the substrate with an aqueous composition excluding an oxidizing agent and consisting essentially of ammonium hydroxide in an amount of about 1 to about 30% by weight calculated as NH3 and a surface active agent represented by the formulaXF2C(CFY)nSO3A whereinX=F, OH, or SO3A; Y=F, H, or OH, or may be omitted thereby creating a double bond; n 1-12; A=NH4+, H+, Na+, K+, Li+, R+ or organic amine cation and R is 1-4 straight chain alkyl group; and wherein the fluoroalkyl group is a linear group; and wherein the surface active agent is present in an amount of about 100 ppm to about 2000 ppm.