Reference

Dissolution of metals

Dissolution of metals. Elias, Moenes L.; Burger, Walter L. (Dart and Kraft, Inc., USA). U.S. US 4437931 A 20 Mar 1984, 4 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C23F001-00; B44C001-22; C03C015-00; C03C025-06. NCL: 156666000. APPLICATION: US 83-525078 22 Aug 1983. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Section cross-reference(s): 76 The etching of metals is promoted by the addn. of a primary diol as a promoter to the soln. contg.Several reagents with their cas registry numbers 7722-84-1 and 7664-93-9 are used here. 0.2-4.5 M H2SO4 and 0.25-8 M H2O2. The suitable diol promoter is HOCR1R2CYCCR3R4OH (R1, R2, R3, R4 = H, Me, OEt, and/or OPr). The promoter is added preferably at 0.1-0.5 M, increasing with the higher content of Cl- and Br- impurities. The soln. is suitable for the etching of Cu coatings on the printed circuit boards. Thus, the laminates clad with 1 oz. Cu/ft2 were immersed in 800 mL soln. stirred at 129 °F. The soln. contained 2.7 M H2SO4, 2.6 M H2O2, Na phenolsulfonate [1300-51-2] stabilizer 2 g/L, and CuSO4.5H2O 11.8 oz/gal. Addn. of 3-hexyne-2,5-diol [3031-66-1] promooter at 1 or 3 vol. % resulted in the etch time of 4 min 7-17 s, compared with 6 min 51 s without the promoter. .

Sulfonated organic compounds

Sulfonated organic compounds. Hardy, Frederick Edward (Procter and Gamble Co.; Procter and Gamble Ltd., USA). Eur. Pat. Appl. EP 105672 A1 18 Apr 1984, 24 pp. DESIGNATED STATES: R: AT, BE, CH, DE, FR, GB, IT, LI, NL, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07C143-46; C07C139-00. APPLICATION: EP 83-305621 22 Sep 1983. PRIORITY: GB 82-27675 28 Sep 1982; GB 83-11497 27 Apr 1983. DOCUMENT TYPE: Patent CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) Section cross-reference(s): 25, 46 C8-18-acyloxybenzenesulfonate salts, useful as org. peroxy acid bleach precursors, are prepd. There are some commonly used reagents like 112-05-0 in this article. in a 1-stage process from a C2-3-alkanoic anhydride, an alkali metal hydroxybenzenesulfonate, and a C6-18 aliph. carboxylic acid, optionally in the presence of a catalyst. Thus, a mixt. of nonanoic acid [112-05-0] 79.61, Na hydroxybenzenesulfonate [1300-51-2] 19.62, Ac2O 12.25, and AcONa [127-09-3] 1 g was refluxed 140 min at 166° and then distd. during 65 min with max. temp. 218°, giving 32.7 g white product comprising 99% Na nonanoyloxybenzenesulfonate [91125-43-8] and 1% AcONa. .