Method for preparing urea-functional siloxanes

US11203669B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Michael Stepp · Braunau am Inn, AT
• Birgit Peschanel · Burghausen, DE

Key dates

• Filing date: Jan 31, 2018
• Grant date: Dec 21, 2021
• Expiry date: Jan 31, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/388
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Urea-functional organopolysiloxanes containing units of the formula RnSiO(4-n)/2  (I), where R is a radical R1 or a radical —OR2 or a radical Q, Q is a urea-functional radical of the formula —R5—[NR4—R6—]xNR4R3  (II), where the radicals R4 are identical or different and are each a radical R4′ or a radical Ru, where R4′ is hydrogen or a monovalent C1-C6-hydrocarbon radical where Ru is radical of the formula —C(═O)—NH2, and where at least one urea-functional radical Q having a radical Ru is present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formula R′nSiO(4-n)/2  (IV), where A is an amino-functional radical of the formula —R5—[NR4′—R6—]xNR4′R3  (V), with the proviso that at least one amino-functional radical A is present per molecule in the organopolysiloxanes made up of units of the formula (III), with ortho-substituted aryl carbamates of the formula R7—Ar—O—C(═O)—NH2  (VI), where Ar is an ortho-substituted aryl radical.