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Patent Searching and Data


Title:
PRODUCTION OF FINE PARTICLE OF II TYPE AMMONIUM POLYPHOSPHATE
Document Type and Number:
Japanese Patent JPH0624717
Kind Code:
A
Abstract:

PURPOSE: To stably produce crystal having large particle diameters and smooth surface in producing II type ammonium polyphosphate by reacting almost equimolar amounts of ammonium phosphate and phosphoric anhydride at a high temperature.

CONSTITUTION: Approximately equimolar amounts of ammonium phosphate and phosphoric anhydride are reacted in an NH3 atmosphere at a high temperature to produce ammonium polyphosphate. In the method, the reaction is carried out in a nitrogen atmosphere in the first process, 30-90% the theoretical amount of an NH3 gas or an NH3 gas evolving substance is supplied in the second process and the residual amount of the NH3 gas is added and aging is performed in the third process to produce II type ammonium polyphosphate.


Inventors:
FUKUMURA CHIKASHI
IWATA MASUO
TANAKA MASAYA
Application Number:
JP1991000188096
Publication Date:
February 01, 1994
Filing Date:
July 02, 1991
Export Citation:
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Assignee:
CHISSO CORP
International Classes:
C01B25/40; C08K3/32; C08L23/02; (IPC1-7): C01B25/40; C08K3/32; C08L23/02
Attorney, Agent or Firm:
佐々井 彌太郎 (外1名)