Fyrol 99, preparation

Several appHcations have been found for bis(2-chloroethyl) vinylphosphonate as a comonomer imparting flame retardancy for textiles and specialty wood and paper appHcations. Its copolymerization characteristics have been reviewed (76,109). This monomer can be hydrolyzed by concentrated hydrochloric acid to vinylphosphonic acid, polymers of which have photoHthographic plate coating utiHty (see Lithography). It is also an intermediate for the preparation of an oligomeric vinylphosphonate textile finish, Akzo s Fyrol 76 [41222-33-7] (110). 

One of the important commercial flame retardants for plastics, the phosphorus-containing oligomer Fyrol 99, is prepared by the condensation of tris -(2-chloroethyl) phosphate, as shown in Fig. 

For one reason or other, most of them did not have all the desired properties. However, the compound which we called Fyrol 6 (20) prepared as shown in equation 27 became a very successful commercial flame... 

Fyrol 76 is a vinylphosphonate/methylphosphonate oligomer and is water soluble. It was developed by Dr. Edward Weil and his group (22,25). It is prepared by the thermal condensation of bis(2-chloroethyl) vinylphosphonate with dimethyl methyl-phosphonate as shown in the idealized equation 29. 

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See also in sourсe #XX -- [ , , ]

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