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US 5,705,448 AGranted
Production of porous articles
AssigneeDytech Corporation Limited
InventorsRodney Martin Sambrook, Robert Terence Smith
Life of this patent
Estimating the term…
Abstract
A gas generating substance is added to an aqueous dispersion containing refractory particles and a polymerizable monomer and the pressure and/or temperature are adjusted so that the substance generates the gas before the polymerization gets underway; to control the formation of pores.
Claims8
A method of making a porous refractory article, the method comprising the steps of:
- (a) forming an aqueous dispersion of refractory particles, the dispersion including a polymerizable monomer component which on polymerization generates an exotherm;
- (b) adding a thermally decomposable gas generating substance to step (a) under conditions of temperature and pressures effective to generate a gas;
- (c) adding a polymerization agent comprising an initiator or a catalyst to step (b), thus causing a polymerization reaction to start and produce heat;
- and
- (d) adjusting the temperature or pressure to cause the gas generating substance to generate the gas before or during polymerization of the monomer component whereby the gas forms bubbles which under the heat of the exotherm interconnect to form an interconnected open pore structure.
2 more elements
Dependencies are inferred from the claim text.