High char yield benzoxazines
US5973144A · kind A · utility
Inventor
Key dates
| Filing date | Oct 3, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Oct 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D265/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Benzoxazine monomers, oligomers and polymers are desirably modified by adding pendant functional groups to either the amine or phenolic reactants. These pendant functional groups can be activated at temperatures generally from about 25.degree. C. to about 300.degree. C. to form chemical bonds between said benzoxazine monomers, oligomers and polymers. The additional chemical bonds increase the thermal stability of benzoxazine polymers such that they can withstand higher use temperature, act as more effective flame barriers, or result in higher amounts of char if used as a precursor to high temperature (600-1000.degree. C. reaction condition) chars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.