Method for producing organopolysiloxanes having unsaturated groups

• Main Authors: MERGET MARKUS, BINDER JOHN
• Format: Patent
• Language: Chinese; English
• Published: 10.11.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a method for producing organopolysiloxanes having unsaturated groups. In a first step, the following are mixed together: an organopolysiloxane (A) comprising units of formula RaQbSiO (4-a-b)/2 (I), with the proviso that a + b < = 3 and siloxane (A) has at least one group Q; an organopolysiloxane (B) comprising units of formula R2d (OR1) fSiO (4-d-f)/2 (II), with the proviso that d + f < = 3; optionally an organopolysiloxane compound (C) having, per molecule, at least one structural unit of the general formula O < 3-(e + g)/2R < 3 > eQ < 1 > g Si-Y (S < 3 > R < 3 > eQ < 1 > g O < 3-(e + g)/2 >) c (III), with the proviso that e + g < = 2, the groups and indices in these formulae having the meanings specified in claim 1; and a basic catalyst (D) selected from the group consisting of a basic hydroxide, a basic alcoholate, and a basic siloxane alkoxide. In a second step, the mixture obtained in the first step is reacted at a temperature of 80 to 170 DEG C, and in a third step, the reaction