Patent ID: 11929257
Assignee: VERSUM MATERIALS US, LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 7:
8. The etching solution of claim 1 wherein the cation of the cationic surfactant is selected from benzyltrimethylammonium (R1═C6H5CH2, R2=R3=R4═CH3), behentrimonium (R1═CH3(CH2)21, R2=R3=R4═CH3), benzalkonium (R1═C6H5CH2, R2═CnH2n+1(n=8, 10, 12, 14, 16, 18), R3=R4═CH3), carbethopendecinium (R1=1-ethoxy-1-oxohexadecan-2-yl, R2=R3=R4═CH3), cetrimonium (R1═C16H33, R2=R3=R4═CH3), didecyldimethylammonium (R1=R2═C10H21, R3=R4═CH3), dimethyldioctadecylammonium (R1=R2═C18H37, R3=R4═CH3), dimethyldipropylammonium (R1=R2═C3H7, R3=R4═CH3), stearalkonium (R1═C6H5CH2, R2═C18H37, R3=R4═CH3), and tetramethylammonium (R1=R2=R3=R4═CH3).