US 4,059,423 AGranted

Process for the preparation of expansible beads

AssigneeSovitec S.A.

InventorsDaniel De Vos, Paul-Marie Michel, Alfred Berger

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Abstract

A process for the preparation of expansible beads which are convertible by firing into cellular glass bodies, such process comprising the steps of preparing a slip having a liquid medium continuous phase and a disperse phase, the slip containing particles of glass or glass-forming material, a cellulating agent, and a binder, the disperse phase of the slip including at least most of the particles, dividing the slip into drops, and subjecting the drops while in divided condition to a heat treatment including heating and cooling stages so as to cause evaporation of liquid from the drops and conversion thereof into self-sustaining beads in which the glass or glass-forming particles are held together by the binder and which contain the cellulating agent or gas derived therefrom.

Claims23

Dependent claims

A process for the preparation of expansible beads which are convertible by firing into cellular glass bodies, said process comprising the steps of:

preparing a slip having a liquid medium continuous phase and a disperse phase, said slip containing particles of glass or glass-forming material, a cellulating agent, and a binder, the disperse phase of said slip including at least most of said particles,
dividing said slip into drops, said slip which is divided into drops having a viscosity in the range 200 to 10,000 cp, and
subjecting said drops while in divided condition to a heat treatment including heating and cooling stages so as to cause evaporation of liquid from said drops and conversion thereof into self-sustaining beads in which said glass or glass-forming particles are held together by said binder and which contain said cellulating agent or gas derived therefrom.

Dependencies are inferred from the claim text.