Chemical oxygen generating compositions containing LI202

• US 5,279,761 A
• Filed: 03/13/1992
• Issued: 01/18/1994
• Est. Priority Date: 03/13/1992
• Status: Expired due to Term

• Current Assignee: BE Intellectual Property, Inc. (Rtx Corporation)
• Original Assignee: Puritan Bennett Corp. (Medtronic Plc)
• Inventors: Cannon, James C., Zhang, Yunchang
• Primary Examiner(s): Lovering, Richard D.
• Assistant Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US07/850,516
• Time in Patent Office: 676 Days
• Field of Search: 252/187.31, 252/187.1
• US Class Current: 252/187.31
• CPC Class Codes: B01J 23/04 Alkali metals
• CPC Class Codes: C01B 13/0211 Peroxy compounds
• CPC Class Codes: C01B 13/0218 Chlorate
• CPC Class Codes: C01B 13/0296 Generators releasing in a self-sustaining way pure oxygen from a solid charge, without interaction of it with a fluid nor external heating, e.g. chlorate candles or canisters containing them charges per se C01B13/02

Abstract

An oxygen-generating candle composition is disclosed of the type that includes an amount of an alkali metal chlorate or perchlorate oxygen source and which upon initiation and decomposition yields oxygen and residual chlorine, wherein the improvement comprises a non-toxic additive in the candle composition for suppression of the residual chlorine and to enhance uniform oxygen generation and evolution. The additive comprises from about 0.1% to about 1.0% by weight of lithium peroxide. The composition also includes a cobalt oxide catalyst, an iron powder fuel and a binder or filler.

Claims

1. In an oxygen-generating candle composition suitable for wet processing fabrication that includes a preponderant amount on a weight basis of an alkali metal chlorate or perchlorate source other than lithium perchlorate alone, together with from about 1.5-30% by weight of a metal fuel powder selected from the group consisting of iron and cobalt, and which upon ignition and decomposition thereof will yield oxygen and residual chlorine, the improvement which comprises from about 0.1% to about 0.5% by weight of Li₂ O₂ incorporated into the candle body composition for suppression of residual chlorine and to enhance uniform oxygen generation and evolution, said candle being an elongated body having a length greater than its diameter, said candle being operable to evolve oxygen over a period of from about 13.6 to about 30.5 minutes in order to meet high altitude descent oxygen flow specifications, with evolved chlorine being less than about 50 ppb, carbon monoxide less than about 3 ppm and carbon dioxide less than about 1500 ppm.

2. The oxygen-generating candle composition of claim 1, wherein is further included a cobalt catalyst in the candle body composition.

3. The oxygen-generating candle composition of claim 2, wherein said cobalt catalyst is a cobalt oxide.

4. The oxygen-generating candle composition of claim 3, wherein said cobalt catalyst is selected from the group consisting of CoO, Co₃ O₄, Co₂ O₃, CoO_x and mixtures there of, wherein x ranges from about 1 to about 1.5.

5. The oxygen-generating candle composition of claim 4, wherein said cobalt catalyst is present in an amount of from about 0.1% to about 5% by weight of the candle body composition.

6. The oxygen-generating candle composition of claim 2, wherein is further included a binder selected from the group consisting of glass powder, glass fibers, ceramic fibers, steel wool, and mixtures of the foregoing.