Oligomers phosphatic compounds

Several commercial products have resulted from our phosphorus oligomer research. Fyrol 99, a 2-chloroethyl ethylene phosphate oligomer, has been successfully used as a flame retardant additive in rebonded urethane foam, in thermoset resins, in intumes-cent coatings, adhesives, paper air filters (13), and related uses. This product is less volatile and has a higher flame retardant efficacy than the parent compound tris(2-chloroethyl) phosphate. A related product was developed especially for use in flexible polyurethane foams. A vinylphosphonate/methylphospho-... 

Other potential contaminants are, however, less obvious and these include lubricants (e.g., silicone grease), plasticizers (e.g., phthalates, phenyl phosphates, sebacates, and bisphenol A), slip agents (e.g., oleamide, erucamide, and stearamide), biocides (e.g., quarternary ammonium compounds) and polymers extracted from laboratory consumables (e.g., silicones from laboratory tubing) and membrane filters (e.g., cyclic oligomers and Nylon 66).168 169... 

Replacement of the entire sugar-phosphate unit has also been accomplished and the oligomeric compounds produced have displayed very interesting characteristics. PNA oligomers have been shown to bind to single-stranded DNA and RNA with extraordinary... 

For different applications, there are different U/F ratios and B-stage oligomers. They can be stabilized by hexamethylene tetramine to keep them alkaline, or they can be reversibly etherifled with methanol or butanol to make them stable and soluble in organic solvents (Fig. 3.10). They may be compounded and processed in water or organic solution or as solid powders for different applications. For final cnre, they are compounded with latent acid catalysts such as ammonium sulfamate, ammonium phenoxyacetate, ethylene sulfite, and trimethyl phosphate and generally heated to accelerate the cross-hnking reaction. 

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