Phosphonates
Phosphonates can be effective flame retardants. (RDC 7/20/2009) “Phosphonates or Phosphonic acids are organic compounds containing one or more C-PO(OH)2 or C-PO(OR)2 (with R=alkyl, aryl) groups. Bisphosphonates were first synthesized in 1897 by Von Baeyer and Hofmann.” “The stability of the metal complexes increases with increasing number of phosphonic acid groups. Phosphonates are highly water-soluble while the phosphonic acids are only sparingly soluble. Phosphonates are not volatile and poorly soluble in organic solvents.” (Wikipedia 7/200/2009)
Recent US Patents
11/23/2010
7,838,604
Method for the production of block copolycarbonate/phosphonates and compositions therefrom
Frietag of FRX Polymers, Massachusetts has developed block copolycarbonate/phosphonates with excellent combination of flame resistance, hydrolytic stability, high Tg, low melt viscosity, low color and high toughness. These resins are useful as fibers, films, coated substrates, moldings, foams, adhesives and fiber-reinforced articles. (RDC 4/12/2011)
7/14/2009
7,560,525
Crystalline polyphosphonates and methods related thereto
Fretag and Go of FRX Polymers, LLC have developed polyphoshphonates whichcan undergo solid state post polymerization reactions and solid state dry mixing with other polymers and are effective flame retardans. (RDC 11/16/2010)
06/02/2009
7,541,415
Process for preparing diaryl alkylphosphonates and oligomeric/polymeric derivatives thereof
Piotrowski et al of Supresta hasformeddiaryl alkyl phosphonate by the reaction of triaryl phosphate with dialkyl alkyl phosphonate in the presence of alkali metal iodide catalyst. The diaryl alkyl phosphonate is reacted in situ with aromatic diol and with at least one branching monomer to provide oligomeric and/or polymeric phosphonates. (RDC 11/16/2010)
11/11/2008
7,449,526
Oligomeric, hydroxy-terminated phosphonates
Levchik of Supresta US has developed epoxy resins that are suitable for forming epoxy laminates that meet a UL-94 rating of V-0 using a hydroxy-terminated oligomeric phosphonate as a flame retardant. (RDC 11/16/2010
Recent Journal Articles
Effect of nano-sized metal compounds on the flame-proof properties of plasticized polyvinyl chloride
(80-84) Fibre Chemistry 41 #2 ( 2009)
Effect of phosphonic acid salt derivatives on the fireproofing indexes of plasticized polyvinyl chloride
(85-87) Fibre Chemistry 41 #2 ( 2009)
Structural and mechanical behavior of layered zirconium phosphonate as a distributed phase in polycaprolactone
(p 993-1001) Journal of Applied Polymer Science 114 #2 (2009)
Synthesis and characterization of phosphorus-containing waterborne polyurethanes: Effects of the organophosphonate content on the flame retardancy, morphology, and film properties
(p 3107-3115) Journal of Applied Polymer Science 110 #5 (2008)