- Author
- Goins, O. K., Jr. | Atwell, R. W. | Nametz, R. C. | Chandik, B.
- Title
- Flame Retardant Unsaturated Polyesters Based on Tetrabromophthalic Anhydride.
- Coporate
- Michigan Chemical Corp., St. Louis, MI
- Book or Conf
- Society of the Plastics Industry, Inc. Reinforced Plastics/Composites Institute. Annual Technical Conference, 29th. February 5-8, 1974., Washington, DC, 23B 1-8 p., 1974
- Keywords
- flame retardants
- Abstract
- Bromine is recognized as being more efficient than chlorine in imparting flame retardancy. The high bromine content of tetrabromophtalic anhydride permits the formulation of excellent flame retardant polyester resins with less halogenated intermediate along the polymer backbone. This yields a formulation versatility which allows high levels of maleic anyhydride along with less costly anhydrides and/or diacids, such as phthalic anhydride and isophthalic acid. Outstanding flame retardant polyesters having higher cross-link densities than possible with other halogenated diacids or anhydrides are possible with tetrabromophthalic anhydride. Thus hot strength and other properties dependent upon higher maleic anhydride content are readily attained. Use of phthalic anhydride, isopthalic acid or other co-acids without reducing halogen level gives formulators the ability to maintain flame retardancy while economically building in other properties, i.e., chemical resistance, etc. Tetrabromophthalic anhydride based unsaturated polyesters have been studied utilizing a variety of coreactants.