Process for the Preparation of Hydroxyl-Functionalized Polysiloxanes

• Main Authors: Woznicka, Marta, Dietrich, Annika, Lund, Henrik, Kragl, Udo, Despotopoulou, Christina, Klein, Johann, Mejia, Esteban, Dunekake, Ralf, Briers, David, Winterberg, Marleen
• Format: Patent
• Language: English
• Published: 24.10.2019
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A method for producing a hydroxyl-functionalized polysiloxane having secondary or tertiary hydroxyl groups, said method comprising the steps of: i) reacting a hydroxyalkyl allyl ether having a secondary or tertiary alcohol group with a siloxane under anhydrous conditions and under transition metal catalysis, said hydroxylalkyl allyl ether conforming to Formula (I) wherein n is 0, 1, 2, 3, 4 or 5, preferably 0; m is 1, 2, 3, 4 or 5, preferably 1; spacer group A is constituted by a covalent bond or a C 1 -C 20 alkylene group; R 1 is hydrogen, a C 1 -C 8 alkyl group, a C 3 -C 10 cycloalkyl group, a C 6 -C 18 aryl group or an aralkyl group; R a , R b , R c , R d , R 2 , R 3 , R 4 and R 5 may be the same or different and each is independently selected from hydrogen, a C 1 -C 8 alkyl group, a C 6 -C 18 aryl group or a C 6 -C 18 aralkyl group, with the proviso that at least one of R 3 and R 4 is not hydrogen; and said siloxane conforming to Formula (II) wherein m is 1, 2, 3, 4 or 5, preferably 1; R 6 , R 7 , R 8 and R 9 may be the same or different and each represent a C 1 -C 8 alkyl group, a C 3 -C 10 cycloalkyl group, a C 6 -C 18 aryl group or a C 6 -C 18 aralkyl group; and ii) in the presence of the reaction product of step i), performing a ring opening polymerization of at least one cyclic siloxane monomer.