Process for producing phenoxyphosphazene compound, flame-retardant resin composition, and flame-retardant resin molding
US6946578B2 · kind B2 · utility
20Cited by
6References
8Claims
0Family size
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Key dates
| Filing date | Dec 23, 2003 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Feb 5, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K21/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved phenoxyphosphazene compound is produced by treating a phenoxyphosphazene compound with (a) at least one adsorbent selected from activated carbon, silica gel, activated alumina, activated clay, synthetic zeolite and macromolecular adsorbents, (b) at least one reagent selected from metal hydrides, hydrazine, hypochlorites, thiosulfates, dialkyl sulfuric acids, ortho esters, diazoalkanes, lactones, alkanesultones, epoxy compounds and hydrogen peroxide, or (c) both the adsorbent and reagent, thereby reducing the acid value of said phosphazene compound to lower than 0.025 mgKOH/g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.