Sodium perborate by the action of sodium metaborate on hydrogen peroxide

Claim 2

AN INDUSTRIAL PRODUCT, SODIUM PERBORATE IN THE FORM OF POROUS SPHERICAL PARTICLES THE APPARENT SPECIFIC GRAVITY OF WHICH, MEASURED BY FLOWING FREELY, IS COMPRISED BETWEEN 0.25 AND 0.50 KG./CUBIC DECIMETER AND WHOSE MOBILITY, EXPRESSED BY THE FLOW-TIME OF A WEIGHT OF 250 G. THROUGH THE ORIFICE OF A SHORT STEM ANALYSIS FUNNEL OF 180 MM. DIAMETER, DOES NOT EXCEED 10 SECONDS.

Claim 3

PROCESS FOR THE MANUFACTURE OF SODIUM PERBORATE OF GREAT MOBILITY AND AN APPARENT SPECIFIC GRAVITY BETWEEN 0.25 AND 0.50 KG./CUBIC DECIMETER, BY THE ACTION OF SODIUM METABORATE ON HYDROGEN PEROXIDE IN THE PRESENCE OF A STABILIZER FOR SAID SODIUM PERBORATE, SAID STABILIZER BEING AN ALKALINE-EARTH METAL SILICATE, COMPRISING THE STEPS OF CONTACTING A SODIUM METABORATE SOLUTION WITH A HYDROGEN PEROXIDE SOLUTION IN THE PRESENCE OF AT LEAST ONE OF THE CONSTITUENTS OF THE STABILIZER AT AMBIENT TEMPERATURE TO PRODUCE A SUPERSATURATED SOLUTION IN WHICH THE RELATIVE SUPERSATURATION IN PERBORATE EXPRESSED BY THE RATIO BETWEEN THE WEIGHT OF PERBORATE VIRTUALLY PRESENT AND THE WEIGHT OF PERBORATE WHICH WOULD NORMALLY BE SOLUBLE IN WATER AT 20*C. IS COMPRISED BETWEEN 4 AND 12, STIRRING THE REACTION MEDIUM CONTINOUSLY BUT NOT ROUGHLY TO DISPLACE THE LIQUID MEDIUM CONTINOUSLY IN PARALLEL LAYERS, AND EFFECTING THE CRYSTALLIZATION OF THE PERBORATE BY COOLING THE REACTION MEDIUM TO A TEMPERATURE BETWEEN 0.C. AND 12*C. WITHIN A SHORT TIME NOT EXCEEDING ONE HOUR.

Claim 4

PROCESS FOR THE MANUFACTURE OF SODIUM PERBORATE OF GREAT MOBILITY AND AN APPARENT SPECIFIC GRAVITY BETWEEN 0.25 AND 0.50 KG./CUBIC DECIMETER, BY THE ACTION OF SODIUM METABORATE ON HYDROGEN PEROXIDE IN THE PRESENCE OF A STABILIZER FOR SAID SODIUM PERBORATE, SAID STABILIZER BEING AN ALKALINE-EARTH METAL SILICATE, COMPRISING THE STEPS OF CONTACTING A SODIUM METABORATE SOLUTION WITH A HYDROGEN PEROXIDE SOLUTION IN THE PRESENCE OF AT LEAST ONE OF THE CONSTITUENTS OF THE STABILIZER AT AMBIENT TEMPERATURE TO PRODUCE A SUPERSATURATED SOLUTION IN WHICH THE RELATIVE SUPERSATURATION IN PERBORATE EXPRESSED BY THE RATIO BETWEEN THE WEIGHT OF PERBORATE VIRTUALLY PRESENT AND THE WEIGHT OF PERBORATE WHICH WOULD NORMALLY BE SOLUBLE IN WATER AT 20*C. IS COMPRISED BETWEEN 4 AND 12, STIRRING THE REACTION MEDIUM CONTINOUSLY BUT NOT ROUGHLY TO DISPLACE THE LIQUID MEDIUM CONTINOUSLY IN PARALLEL LAYERS, AND EFFECTING THE CRYSTALLIZATION OF THE PERBORATE BY COOLING THE REACTION MEDIUM TO A TEMPERATURE BETWEEN 0.C. AND 12*C. WITHIN A SHORT TIME NOT EXCEEDING ONE HOUR.