Reference

Tantalum powder

Tantalum powder. Fry, Stanley S. (Fansteel, Inc., USA). U.S. US 4009007 22 Feb 1977, 11 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C22C001-04. NCL: 029182500. APPLICATION: US 75-595569 14 Jul 1975. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Ta powder for capacitors with improved elec. capacitance is prepd. by the addn. of P-contg. materials in amts. of .apprx.5-400 ppm based on elemental P. Thus, CH3OH and Ca orthophosphate (I) [7758-87-4] were added to Na-reduced Ta powder to form a slurry. The amt. of I was adequate to contain 261-326 ppm P. 7440-25-7 and 7446-27-7 are also in the experiment. The mixt. was blended with addnl. Ta to obtain a concn. of 37.5 ppm elemental P. The powder was pressed to 6.45 g/cm3, sintered 30 min at 1800-2000.degree., and tested for d. and sp. capacity. .

Monitoring suspension stability

Monitoring suspension stability. Weisser, Eugene P.; Osan, G. Alan; Mailki, Edward P. (Arco Polymers, Inc., USA). U.S. US 4007319 8 Feb 1977, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08F002-18. NCL: 526060000. APPLICATION: US 75-630484 10 Nov 1975. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) A method for detecting impending failure of suspension during aq. suspension polymn. involves continuous monitoring of the elec. cond. of the suspension system; a sudden drop in cond. warns of failure of suspension by the addn. of suspension stabilizers. The method was illustrated by the radical suspension polymn. of styrene [100-42-5] in the presence of tricalcium phosphate [7758-87-4] and Na dodecylbenzenesulfonate [25155-30-0].Except for chemicals metioned above, 25155-30-0 and 100-42-5 are also used. .