Composite phosphorus flame retardant comprising cyclic organophosphate with multiple DOPO moieties and preparation method thereof
US11078223B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2016 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Aug 10, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K21/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention discloses a composite phosphorus flame retardant comprising cyclic organophosphate with multiple DOPO moieties, and a manufacturing method thereof. The composite structure phosphorus flame retardant has a structural formula comprising at least one organophosphate and at least two DOPO cyclic organophosphates. The method comprises: mixing the DOPO with a polyhydroxy alkane or a hydrocarbon substituent, wherein the polyhydroxy alkane has at least three hydroxy groups, and the hydrocarbon substituent has a chain with at least three carbon atoms; heating the mixture to 195-210° C. and reacting for 14-17 hours in the presence of a protective gas, and then cooling to room temperature; adding a phosphorus oxohalide or an incompletely esterified phosphorus oxohalide; and heating to 55-65° C. and reacting for 1.5-3 hours, then cooling to room temperature to obtain the product. The invention provides flame retardation at two decomposition temperatures, the first occurring within a range of 230-310° C., while the other occurring after 345° C. The in has a simple composition, is easy to use, has high phosphorus contents, and provides improved flame retardance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.