| Title of Invention | "SUBSTANTIALLY ANHYDROUS BLOWING AGENT AND PROCESS FOR PRODUCING THE SAME" |
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| Abstract | A process for producing a anhydrous blowing agent, which comprises treating in a manner such as herein described a conventional blowing agent with a surface-treating agent capable of removing water from the blowing agent under conditions free of a solvent. |
| Full Text | WE CLAIM: 1. A process for producing an anhydrous blowing agent, which comprises treating in a manner such as herein described a conventional blowing agent with a surface-treating agent of the kind such as herein described capable of removing water from the blowing agent under conditions free of a solvent. 2. The process as claimed in claim 1, wherein optionally a heating treatment is carried out during or after the treatment with the surface- treating agent. 3. The process as claimed in claim 2, wherein the heating treatment is carried out at a temperature of 30°C to the decomposition temperature of the blowing agent. 4. The process as claimed in claim 3, wherein the heating is carried out at a temperature of 55 to 100°C. 5. The process as claimed in anyone of claims 2 to 4, wherein the surface- treating agent is subjected to preheating treatment. 6. The process as claimed in anyone of claims 1 to 5, wherein the treatment of the blowing agent with the surface-treating agent is carried out by spraying the surface-treating agent to the blowing agent, and mixing them under mixing conditions where pulverization of a blowing agent is inhibited. 7. The process as claimed in claim 6, wherein a ribbon blender or a screw mixer is used as a mixer under the mixing conditions where pulverization of a blowing agent is inhibited. 8. The process as claimed in anyone of claims 1 to 7, wherein the blowing agent is crystalline azodicarbonamide. 9. The process as claimed in anyone of claims 1 to 8, wherein the surface- treating agent is at least one selected from the group consisting of a coupling agent, an organic acid anhydride, an anhydrous inorganic compound, and a desiccant. 10. The process as claimed in claim 9, wherein the surface-treating agent is at least one selected from the group consisting of a silane coupling agent, an aluminum coupling agent, and a titanate coupling agent. 11. The process as claimed in claim 10, wherein the surface-treating agent is selected from the group consisting of aluminum isopropylate, aluminum ethylate, aluminum tris(ethylacetoacetate), and ethylacetoacetato-aluminum diisopropylate. 12. A process for producing a substantially anhydrous blowing agent substantially as herein described with reference to the foregoing examples. |
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1992-del-1998-correspondence-others.pdf
1992-del-1998-correspondence-po.pdf
1992-del-1998-description (complete).pdf
1992-del-1998-petition-137.pdf
1992-del-1998-petition-138.pdf
| Patent Number | 215274 | ||||||||||||||||||
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| Indian Patent Application Number | 1992/DEL/1998 | ||||||||||||||||||
| PG Journal Number | 10/2008 | ||||||||||||||||||
| Publication Date | 07-Mar-2008 | ||||||||||||||||||
| Grant Date | 22-Feb-2008 | ||||||||||||||||||
| Date of Filing | 10-Jul-1998 | ||||||||||||||||||
| Name of Patentee | OTSUKA CHEMICAL CO. LTD. | ||||||||||||||||||
| Applicant Address | 3-2-27, OTE-DORI, CHUO -KU, OSAKA-SHI, OSAKA, JAPAN. | ||||||||||||||||||
Inventors:
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| PCT International Classification Number | C08K 9/04 | ||||||||||||||||||
| PCT International Application Number | N/A | ||||||||||||||||||
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PCT Conventions:
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