Process for preparing low molecular weight linear phosphonitrilic chloride oligomers
US4198381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1978 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Aug 21, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/098
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In the first step of a two step process, PCl.sub.3 and Cl.sub.2 are reacted in a suitable medium. In the second step, PCl.sub.3, Cl.sub.2 and NH.sub.3 are concurrently fed into said medium while keeping the temperature at 100.degree. C. to 140.degree. C. The feeds of the reactants are controlled so that until the first 1/2 of the NH.sub.3 has been reacted the molar ratio of PCl.sub.3 :NH.sub.3 (including the PCl.sub.3 of the first step) is kept above 2. Thereafter, the feeds are adjusted so that with respect to the total amount of ammonia, said molar ratio is between 1.2 and 1.5. Linear phosphonitrilic chloride oligomers having a number average degree of polymerization from 2 to 9 are produced in high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.