Method of selectively preparing phosphorus containing flame retardants and their use in thermoplastics
US12365703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2024 |
| Grant date | Jul 22, 2025 |
| Priority date | — |
| Expiry date | Mar 18, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A phosphorus-containing flame retardant is produced by reacting at a reaction temperature a mixture including a metal or suitable metal compound and a stoichiometric excess relative to the metal or suitable metal compound of an unsubstituted or alkyl or aryl substituted phosphonic or pyrophosphonic acid, wherein the phosphonic or pyrophosphonic acid is in a molten state at the reaction temperature. The chemical composition of the resulting flame retardant product leads to excellent flame retardancy and exhibits high thermal stability. The presently disclosed flame retardants are useful, for example, in polymer compositions, particularly thermoplastics processed at high temperatures, over a wide range of applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.