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AssigneesIshihara Sangyo Kaisha, Ltd., Act Research, Inc.
InventorsMasashi Sakamoto, Haruo Okuda, Hideo Futamata
Estimating the term…
A pigment for sensing gas leakage can be produced by adding at least one of salts of platinum group metals to a slurry of particulate substrate, neutralizing the resultant mixture to deposit at least one of oxides, hydroxides and hydrated oxides of platinum group metals on the surfaces of said particulate substrate, and if necessary, further adding to said slurry at least one of compounds of aluminum, silicon, titanium, zinc, zirconium, tin, antimony and cerium, neutralizing the resultant mixture to deposit at least one of compounds such as oxides, hydroxides and hydrated oxides of aluminum, silicon, titanium, zinc, zirconium, tin, antimony and cerium, on the particles. The pigment for sensing gas leakage allows any combustible gas such as hydrogen, carbon monoxide, acetylene, methane and the like leaking from chemical reaction apparatuses and various factories using reducing gases to be definitely and conveniently detected by applying the pigment onto the surfaces of the outer walls and pipes of chemical reaction apparatuses as well as the surfaces of the rooms of the factories.
A pigment for sensing reducing gas leakage, comprising titanium dioxide particles having deposited thereon at least one compound selected from the group consisting of oxides, hydroxides and hydrated oxides of platinum group metals, said pigment exhibiting a degree of color change, .increment.E, of not less than 15, one minute or earlier after contact of said pigment with the reducing gas.
A pigment for sensing reducing gas leakage, comprising titanium dioxide particles having deposited thereon at least one compound selected from the group consisting of oxides, hydroxides and hydrated oxides of platinum group metals present on the surface thereof, and additionally having at least one compound selected from the group consisting of oxides, hydroxides and hydrated oxides of aluminum, silicon, titanium, zinc, zirconium, tin, antimony and cerium present on the particles, said pigment exhibiting a degree of color change, .increment.E, of at least 15, one minute or earlier after contact of said pigment with the reducing gas.
A method for sensing reducing gas leakage comprising the steps of:
A method for sensing reducing gas leakage comprising the steps of:
A pigment for sensing reducing gas leakage, comprising titanium dioxide particles having an average particle size of 0.01 to 0.5 .mu.m, and having deposited thereon at least one compound, in an amount of 0.5 to 10% by weight in terms of PdO, selected from the group consisting of oxides, hydroxides and hydrated oxides of palladium, said pigment exhibiting a degree of color change, .increment.E, of not less than 15, one minute or earlier after contact of said pigment with the reducing gas.
A pigment for sensing reducing gas leakage, comprising titanium dioxide particles having an average particle size of 0.01 to 0.5 .mu.m, and having deposited thereon at least one compound, in an amount of 0.5 to 10% by weight in terms of PdO, selected from the group consisting of oxides, hydroxides and hydrated oxides of palladium present on the surface thereof, and additionally having at least one compound selected from the group consisting of oxides, hydroxides and hydrated oxides of aluminum, silicon, titanium, zinc, zirconium, tin, antimony and cerium present on the particles, said pigment exhibiting a degree of color change, .increment.E, of at least 15, one minute or earlier after contact of said pigment with the reducing gas.
Dependencies are inferred from the claim text.