Thermally stable diphosphonate-type flame retardant additive for plastics
US4910240A · kind A · utility
3Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1987 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jul 23, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/5333
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Flame retardant polyester compositions are prepared by incorporating into a polymer from 1-20% by weight of a flame retardant having the structural formula: ##STR1## where Ar is aryl and R and R' are independently alkylene. This class of flame retardant shows high temperature stability and permits incorporation of the flame retardant into the polyester by hot milling at temperatures up to about 390.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.