Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Using organometallic or organosilicon intermediate
Reexamination Certificate
2007-12-11
2007-12-11
Lopez, Carlos (Department: 1731)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Using organometallic or organosilicon intermediate
C264S627000, C264S042000, C264S043000
Reexamination Certificate
active
10411051
ABSTRACT:
A process for foaming ceramic foams, in which the ceramic foams are produced from a precursor or a mixture of precursors which contain at least one ceramic-forming element and liberates at least one volatile reaction product during an inorganic gelation process. In one embodiment, foaming is based on a precursor containing crystals of the AlCl3(Pri2O) complex. The decomposition of the initial precursor produces polymerizing species dissolved in liquid isopropyl chloride. The solvent and growing AlOxCly(OPri)zspecies are mixed homogeneously so that the boiling point of the solution is raised above the boiling point of the pure isopropyl chloride. Polymerization takes place in the liquid until a critical polymer size is attained, whereupon a phase separation into polymer rich and solvent rich regions occurs. Since the expelled solvent is suddenly above its boiling point, bubbles start forming instantly. Foam stabilization takes place as a result of gelation in the polymer rich regions which comprise the cell walls in the foam. The net result of the process is a gelled ultra light foam.
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Dehazan Yoram
Grader Gideon
Shter Gennady
Cellaris Ltd.
Hunton & Williams LLP
Lopez Carlos
Rzucidlo Eugene C.
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