Process for producing phosphazene fire retardant
US4081593A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1976 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Jan 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S260/24
- 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.