초록 ▼

A device for detecting combustion products and effects resulting from combustion is made by preparing a composition of metallo-phthalocyanine in amorphous or crystaline form selected from the group of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing the

A device for detecting combustion products and effects resulting from combustion is made by preparing a composition of metallo-phthalocyanine in amorphous or crystaline form selected from the group of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing the metallo-phthalocyanine in powder form with a carbon-containing solvent and allowing it to remain in the solvent for a period of time to modify its initial phthalocyanine molecule, stirring the mixture to provide a suspension of the modified composition in the solvent, applying a thin uniform coating of such suspension in a selected pattern on an insulating substrate and drying the coating to form a resistance element having a resistance between 10 6 ohms and 10 10 ohms. Electrical contacts are provided for connecting such resistance element into an electrical circuit for measuring its electrical resistance and thereby detecting change of electrical resistance produced by exposure to combustion products and effects resulting from combustion.

대표청구항 ▼

1. Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Cu II Pc, CuPc-CCl 4 where Pc repr

1. Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrate and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition is applied to said substrate. 2. A process according to claim 1, in which the phthalocyanine molecule of said composition is modified by replacing one or more carbon atoms in each peripheral benzene ring by nitrogen. 3. A process according to claim 1, in which the phthalocyanine molecule of said composition is modified by adding a coordinating group selected from the group consisting of chloranil, pyridine, tetracyano-quinodimethane, paraphenylene and diamine. 4. A process according to claim 1, 2, or 3, in which the resistance of said composition is modified by mixing two or more of said metallo-phthalocyanines. 5. A process according to claim 1, in which said phthalocyanine composition is applied to said substrate by sublimation in a vacuum at a temperature between 350° C. and 400° C. and pressure between 10 -4 and 10 -2 mmHg. 6. A process according to claim 1, in which the electrical resistance of said coating is modified by the application of heat. 7. A process according to claim 1, in which the electrical resistance of said coating is modified by the application of pressure in the range between 2 and 10 tons/cm 2 . 8. A process according to claim 1, in which the electrical resistance of said coating is modified by exposure of said coating to infra-red radiation. 9. A process according to claim 1, in which said solvent is carbon tetrachloride and in which said phthalocyanine composition is allowed to remain in said solvent for a period of the order of 24 hours. 10. A device for detecting combustion products and effects resulting from combustion which comprises an insulating substrate, spaced conducting electrodes deposited on said substrate and a thin uniform coating of an amphorphous or crystalline metallo-phthalocyanine composition deposited on said substrated between said electrodes, said composition being selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc and CuPc-CCl 4 where Pc represents phthalocyanine, said coating being prepared by mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule, stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on said insulating substrate and drying said coating to form on said substrate a resistance element having a resistance of 10 6 ohms to 10 11 ohms, said substrate having a resistance at least 10 times that of said resistance element, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition before said composition is applied to said substrate. 11. A combustion detection device according to claim 10, comprising two of said resistance elements mounted adjacent one another on a base, one of said resistance elements being exposed directly to the atmosphere and the other of said resistance elements being covered with a transparent cover having an aperture affording restricted communication with the atmosphere. 12. A combustion detecting device according to claim 10, in which said substrate comprises alumina covered with a very thin layer of glass having a melting point of about 550° C. 13. A combustion detecting device according to claim 10 or 12, in which said electrodes comprise silver-palladium alloy annealed on said substrate and electrochemically plated with gold. 14. Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents the monomeric phthalocyanine group, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrated and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground molecular sieve being introducted into the mixture of said metallo-phthalocyanine and carbon-containing solvent to reduce sensitivity of the device to atmospheric pressure.