Manufacturing process for aminoalkyl silanes

US6423858B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Christoph Schwarz · Burnaby, CA
• Frank Kropfgans · Rheinfelden (Baden), DE
• Hartwig Rauleder · Rheinfelden (Baden), DE
• Hermann-Josef Korte · Haltern, DE

Key dates

• Filing date: Nov 26, 2001
• Grant date: Jul 23, 2002
• Expiry date: Nov 26, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aminoalkylsilanes of formula I:R1R2N—(CH2)y—Si(OR3)3−nR4n  (I),wherein R1 and R2 are each independently, identical of different, hydrogen, aryl, arylalkyl or C1-4-alkyl; R3 and R4 are each independently, identical or different, C1-8-alkyl or aryl; y is 2, 3 or 4 and n is 0 or 1, 2 or 3, are prepared by a process comprising:reacting an organosilane of formula II:X—(CH2)y—Si(OR3)3−nR4n  (II),wherein X is Cl, Br, I or F; and R3, R4, y and n are each as defined above with ammonia or an organic amine compound of the formula:HNR1R2  (III), whereinR1 and R2 are each as defined above with at least one of R1 and R2 not being hydrogen in a liquid phase;evaporating ammonia or organic amine under reduced pressure while ammonium chloride or aminohydrochloride by-products, produced in the reaction of the first step, remains dissolved in the liquid phase;transferring the product mixture after said evaporation to another vessel operated at a lower pressure level of than the second stage, and allowing ammonium chloride or aminohydrochloride to crystallize;separating the crystalline ammonium chloride or aminohydrochloride …