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Phase-stabilization of ammonium nitrate by zinc diammine complexes

  • US 5,071,630 A
  • Filed: 06/20/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 06/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method of preparing zinc-phase-stabilized ammonium nitrate having an improved retention of phase-stability, reduced hygroscopicity, and minimal cure interference in polyurethane cure-systems, consisting ofa) reacting zinc oxide by co-melting it with 3 to 4 times the molar quantity of ammonium nitrate,b) removing the water generated in said reaction by purging the melt with dry inert gas, followed byc) adjusting the ammonia content of the melt to 200 to 204 mole per cent with respect to the applied zinc oxide by passing dry ammonia gas into said melt, andd) dissolving said melt in dry, molten ammonium nitrate to give a zinc metal concentration of 1 to 4 per cent, followed bye) solidification and granulation of the product.

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