Silica-coated barium metaborate pigments and processes of producing the same

• US 3,033,700 A
• Filed: 12/14/1959
• Issued: 05/08/1962
• Est. Priority Date: 12/14/1959
• Status: Expired due to Term

• Current Assignee: John D. Pera, Stanley J. Buckman
• Original Assignee: John D. Pera, Stanley J. Buckman
• Inventors: Buckman, Stanley J., Pera, John D.
• Application Number:
  US03/859,104
• Time in Patent Office: 876 Days
• US Class Current: 106/462
• CPC Class Codes: A01C 1/06 Coating or dressing seed
• CPC Class Codes: C01B 33/113 Silicon oxides; Hydrates thereof preparing monoxide by reduction of siliceous material C01B33/182
• CPC Class Codes: C01B 35/06 Boron halogen compounds
• CPC Class Codes: C01B 35/10 Compounds containing boron and oxygen C01B35/06 takes precedence
• CPC Class Codes: C01B 35/12 Borates C01B35/1063 takes precedence
• CPC Class Codes: C01P 2002/02 Amorphous compounds
• CPC Class Codes: C01P 2002/82 by IR- or Raman-data
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/80 Particles consisting of a mixture of two or more inorganic phases
• CPC Class Codes: C01P 2004/84 one phase coated with the other
• CPC Class Codes: C01P 2006/20 Powder free flowing behaviour
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C01P 2006/82 water content
• CPC Class Codes: C01P 2006/90 Other properties not specified above
• CPC Class Codes: C09C 1/02 Compounds of alkaline earth metals or magnesium C09C1/0003, C09C1/0009, C09C1/0015, C09C1/0078 take precedence; dolomitic solids C09C1/009

Claims

1. A PROCESS FOR THE PRODUCTION OF A SILICA-COATED BARIUM METABORATE PIGMENT IN PARTICULATE FORM, WHICH COMPRISES COMMINGLING IN AN AQUEOUS MEDIUM BARIUM METABORATE PARTICLES WITH A SILICATE SELECTED FROM THE GROUP CONSISTING OF LIQUID ALKALI-METAL SILICATES HAVING A RATIO BY WEIGHT OF SILICA TO ALKALI METAL COMPUTED AS ALKALI-METAL OXIDE BETWEEN 2.50:

1 AND 4.10;

1 AND DEIONIZED PREPARATION COMPUTED AS SILICA BETWEEN APPROXIMATELY 3 AND APPROXIMATELY 25 PERCENT BY WEIGHT OF THE BARIUM METABORATE, HEATING THE SAID MIXTURE AT A TEMPERATURE BETWEEN APPROXIMATELY 75*C. AND APPROXIMATELY 200*C. FOR A PERIOD BETWEEN APPROXIMATELY 1 AND APPROXIMATELY 6 HOURS, AND SUBSEQUENTLY SEPARATING THE PARTICULATE SOLID PRODUCT FROM THE AQUEOUS MEDIUM AND DRYING THE SAME.