Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Reexamination Certificate
2006-05-09
2006-05-09
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
C423S186000, C423S190000, C423S266000, C423S275000
Reexamination Certificate
active
07041267
ABSTRACT:
The invention relates to a process for the production, by fluid-bed spray granulation, of granular sodium percarbonate having a low TAM value. According to the invention, in the fluid-bed spray granulation, an Mg compound in a quantity of 50 to 2,000 ppm, in particular 100 to 1,000 ppm, or/and a complexing agent from among the hydroxycarboxylic acids, aminocarboxylic acids, aminophosphonic acids and phosphonocarboxylic acids, hydroxyphosphonic acids and their alkali metal salts, ammonium salts or Mg salts, in a quantity of 50 to 2,000 ppm, in particular 200 to 1,000 ppm, are added as stabilisers to the soda solution and/or H2O2solution. Preferably a combination of an Mg compound in a quantity of 100 to 1,000 ppm Mg2+and waterglass in a quantity of 0.1 to 1 wt. %, in particular 0.1 to 0.5 wt. %, is used, and in this case granules having a TAM value of about or below 6 μW/g and simultaneously a short dissolving time, are obtainable.
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English language abstract of OR above.
English language abstract of PR above.
English language abstract of QR above.
Database WPI, Derwent Publications, XP 002180576.
Bertsch-Frank Birgit
Jakob Harald
Degussa - AG
Lish Peter J.
Pillsbury Winthrop Shaw & Pittman LLP
Silverman Stanley S.
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