Patent ID: 8802883

Claim:
A method for the manufacture of di-alkylphosphites starting from a P—O component containing from 1 to 6 P—O—P bonds in the molecule comprising the step of: a) reacting a mixture of R′OH and P—O, expressed in molar ratios of R′OH:P—O of at least 1:1 to 6:1, wherein R′ is selected from alkyl groups having from 5 to 20 carbon atoms in branched or linear configuration; and an acid ester having the formula: R—C(O)OR′ wherein R′ has the meaning as stated above, wherein R represents an alkyl chain having from 1 to 6 carbon atoms, wherein the minimum number of mole(s) of R—C(O)OR′ per P atom in the P—O molecule, required for the method is represented by z and z is determined by the formula z=2n−m, wherein m is the number of P—O—P bonds in the P—O molecule, and n is the number of P atoms in the P—O molecule; by adding the P—O component to the R′OH, simultaneously with or separately from the acid ester; at a temperature in the range of from 40° C. to 180° C. for a period of from 10 minutes to 10 hours under simultaneous distillation of the carboxylic acid formed.