SOLVENT REPLACEMENT IN THE SYNTHESIS OF PERSUBSTITUTED PHOSPHONITRILIC HYDROQUINONE PREPOLYMER MATERIALS

A desirable solvent replacement has been effected in the synthesis of persubstituted phosphonitrilic hydroquinone prepolymer materials. The replacement of carbon tetrachloride with cyclohexane has no adverse ef fect on the composition and quality of the material prepared. The over all yield of the reaction increases from 65 to 70% and the toxicity of the reaction mixture and of the waste generated from the reaction are greatly reduced. The particularly close match of solvent properties b etween carbon tetrachloride and cyclohexane makes this an excellent so lvent replacement. Such changes to less-expensive, less-toxic, and les s-environmentally damaging solvents are on the increase. A brief list of some known replacement solvents for use in polymer and coatings app lications is presented. (C) 1994 John Wiley & Sons, Inc.