Method of producing hollow, heat-resistant beads
AssigneeBayer Aktiengesellschaft
InventorWulf V. Bonin
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Abstract
Novel hollow beads are characterized in that they contain aluminium phosphates optionally containing boron. They can be produced by first drying, at from 20.degree. to 200.degree. C., reaction products of acid aluminium phosphates (and optionally boric acid) with amines, then comminuting them and finally subjecting them to a heat shock of from 200.degree. to 1200.degree. C. Such hollow beads can be used for a great variety of purposes.
Claims8
A process for producing hollow beads by first drying a reaction product of an acid aluminum phosphate with an amine at from 20.degree. to 200.degree. C., then comminuting the dried reaction product and finally subjecting it to a heat shock by contact with a media preheated to a temperature of from 250.degree. to 1200.degree. C., or by heating to a temperature within said range by the direct action of microwaves, alternating fields or radiation, to produce hollow beads.
Dependencies are inferred from the claim text.