Method of encapsulating volatile organic liquids

• US 4,579,779 A
• Filed: 09/30/1983
• Issued: 04/01/1986
• Est. Priority Date: 09/30/1983
• Status: Expired due to Fees

• Current Assignee: Freund Industrial Company Limited
• Original Assignee: Freund Industrial Company Limited
• Inventors: Ohno, Shigeru
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Wax, Robert A.
• Application Number:
  US06/537,682
• Time in Patent Office: 914 Days
• Field of Search: 264/4.1, 428/402.2, 424/14, 252/315.1, 252/315.6, 239/53
• US Class Current: 428/402.2
• CPC Class Codes: A01N 25/18 Vapour or smoke emitting compositions with delayed or sustained release
• CPC Class Codes: A01N 25/26 in coated particulate form
• CPC Class Codes: A01N 25/28 Microcapsules or nanocapsules
• CPC Class Codes: B01J 13/04 by physical processes, e.g. drying, spraying
• CPC Class Codes: Y10T 428/2984 Microcapsule with fluid core [includes liposome]

Abstract

A method of encapsulating organic liquids for controlled volatilization and release is described, which comprises in one embodiment charging a fine silica into a mixing container which does not inflict shearing force to the contents and adding the liquid (having a viscosity of 50 centipoise or less at 25° C.) onto and mixing with the fine silica in the mixing container.

Claims

1. A method of encapsulating a volatile organic liquid having a viscosity of 50 centipoise or less at 25°

C., with particles of amorphous silica, which comprises;

providing particles of said silica in a mixing vessel;

adding said liquid to the particles; and

mixing the silica and the liquid under non-shearing conditions;

said silica having an average particle size of less than 300 micron and a micropore distribution characterized by 50% of the integrated volume of said micropore being distributed to the micropores having a radius of up to 1000 Angstroms.

2. The product of the method of claim 1.