Method for producing organopolysiloxanes with unsaturated groups

A method for producing organopolysiloxanes having unsaturated groups, comprising:

• wherein in a first step organopolysiloxanes (A), organopolysiloxanes (B), catalysts (D) and optionally organopolysiloxane compounds (C) are provided and mixed together,
• wherein the organopolysiloxanes (A) comprise units of the formula (I)
• RaQbSiO(4−a−b)/2 (I),
• wherein R may be the same or different and is a monovalent, saturated hydrocarbon radical having 1 to 18 carbon atoms and optionally substituted by fluorine, chlorine or bromine atoms,
• wherein Q may be the same or different and is unsaturated hydrocarbon radicals which may comprise aromatic and/or aliphatic double bonds,
• wherein a is 0, 1, 2 or 3,
• wherein b is 0, 1, 2 or 3, and
• wherein the sum of a+b is ≤3 and the organopolysiloxanes (A) have at least one radical Q,
• wherein the organopolysiloxanes (B) comprise units of the formula (II)
• R2d(OR1)fSiO(4−d−f)/2 (II),
• wherein R2 may be the same or different and is a monovalent, saturated hydrocarbon radical having 1 to 18 carbon atoms and optionally substituted by fluorine, chlorine or bromine atoms,
• wherein R1 may be the same or different and is a hydrogen atom or alkyl radicals having 1 to 4 carbon atoms which may be substituted by oxygen atoms,
• wherein d is 0, 1, 2 or 3,
• wherein f is 0, 1, 2 or 3, and
• wherein the sum of d+f is ≤3,
• wherein the optional organopolysiloxane compounds (C) comprise at least one structural unit per molecule of the general formula (III)
• O3−(e+g)/2R3eQ1gSi—Y(SiR3eQ1gO3−(e+g)/2)c (III)
• wherein R3 may be the same or different and is a monovalent, saturated hydrocarbon radical having 1 to 18 carbon atoms and optionally substituted by fluorine, chlorine or bromine atoms,
• wherein Q1 may be the same or different and is unsaturated hydrocarbon radicals which may comprise aromatic and/or aliphatic double bonds,
• wherein Y is a di- to dodecavalent organic radical having 1 to 30 carbon atoms, which may comprise one or more oxygen atoms,
• wherein e is 0 or 1,
• wherein c is an integer from 1 to 11,
• wherein g is 0 or 1, and
• wherein the sum of e+g is ≤2,
• wherein the basic catalysts (D), are selected from the group of alkali metal hydroxides, alkali metal alkoxides and alkali metal siloxanolates;
• wherein in a second step the mixture obtained in the first step is allowed to react at temperatures of 80 to 170° C.;
• and
• wherein in a third step the reaction mixture obtained in the second step is neutralized with carboxylic acid derivatives having at least 4 carbon atoms (E).