Method for preparing melamine salt of bis-(pentaerythritol phosphate) phosphoric acid
US6737526B1 · kind B1 · utility
2Cited by
1References
11Claims
0Family size
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Key dates
| Filing date | Nov 26, 2002 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Nov 26, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/65748
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Bis-(pentaerythritol phosphate) phosphoric acid is prepared by mechanochemical synthesis including ball milling a mixture containing P2O5, pentaerythritol, an alkyl benzene having one or two C1-C5 alkyl groups, and a metal halide catalyst, in a ball mill as a reactor and at a temperature of room temperature to 150° C. Melamine is then reacted with the resulting bis-(pentaerythritol phosphate) phosphoric acid to form a product of melamine salt thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.