Patent ID: 6068788
Filing Date: 2000-05-30
Classification: C11D,H01L

Abstract:
and M is a hydrogen or salt;C.sub.n H.sub.2n+1 phO(CH.sub.2 CH.sub.2 O)mSO.sub.3 M wherein ph is a phenylene group, n is 5 to 20, m is 0 to 20, and M is a hydrogen or salt; andC.sub.n H.sub.2n+1 O(CH.sub.2 CH.sub.2 O)mSO.sub.3 M wherein n is 5 to 20, m is 0 to 20, andM is a hydrogen or salt, dissolved in 0.1 to 1000 ppm into a 20 to 60 wt % of hydrogen fluoride (HF), and the remainder is water (100 wt % in total).