Process for producing phosphazene fire retardant and product
US3974242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1974 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Dec 5, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L1/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing fire retardant phosphonitrilate polymers by reacting phosphonitrilic halide with a hydroxyl compound such as an aliphatic or aromatic alcohol at not more than about 40.degree.C in the presence of an acid acceptor, such as pyridine, under conditions such that a relatively low concentration of the hydroxyl compound is present during the initial 1/2 to 3 hours of the reaction and the reaction conditions are maintained at from 20.degree.-50.degree.C for a period of 1/2 to 120 hours and, optionally, further heating the reaction mixture to a temperature of 40.degree.-80.degree.C for 1/2 to 81/2 hours. The phosphonitrilate polymers are suitable for fire retarding cellulosic materials such as regenerated cellulose, rayon and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.