organic halides preferred organic halides are those wherein the organic radical is a hydrocarbon radical preferably having from 1 to 10 carbon atoms examples of preferred organic halides include methylchloride ethyl chloride methyl bromide ethyl bromide methyl iodide ethyl iodide propyl iodide n butyl iodide sec butyl iodide and n decyl iodide examples of the above noted phosphonium catalysts include among others methyl triphenyl phosphonium iodide ethyl triphenyl phosphonium iodide propyl triphenyl phosphonium iodide n butyl triphenyl phosphonium iodide iso butyl triphenyl phosphonium iodide sec butyl triphenyl phosphonium iodide n pentyl triphenyl phosphonium iodide n decyl triphenyl phosphonium iodide methyl tributyl phosphonium iodide ethyltributyl phosphonium iodide propyl tributyl phosphonium iodide methyl triphenyl phosphonium chloride ethyl triphenyl phosphonium chloride propyl tributyl phosphonium iodide n butyl triphenyl phosphonium chloride and ethyl triphenyl phosphonium bromide the amount of the fusion catalyst will vary over a wide range in general amount of catalyst will vary from about 0 001 by weight and more preferably from about 0 05 to about 5 by weight of the reactants the fusion reaction itself must take place under carefully controlled conditions most importantly while an elevated temperature is necessary for the reaction to proceed the temperature of the reactants should not be more than 120 u00b0 c the fusion reaction itself should also be monitored the reaction should be terminated when the average molecular weight of the resin is from 500 to 700 this point is reached quickly accordingly it is preferred that reaction parameters of a temperature of 100 u00b0 to 120 u00b0 c and time of from 10 to 20 minutes be utilized still more preferably these parameters are about 115 u00b0 c and 15 minutes the reaction is desirably carried out under conditions minimizing outside influence for this purpose an inert atmosphere such as.