| US 7,468,454 B2 | ||
| Amino-functional polyurethane prepolymers and a process for their preparation | ||
| Michael Mager, Leverkusen (Germany) | ||
| Assigned to Bayer MaterialScience AG, Leverkusen (Germany) | ||
| Filed on Jun. 30, 2005, as Appl. No. 11/171,709. | ||
| Claims priority of application No. 10 2004 032 417 (DE), filed on Jul. 05, 2004. | ||
| Prior Publication US 2006/0004173 A1, Jan. 05, 2006 | ||
| Int. Cl. C07C 269/02 (2006.01); C07C 269/06 (2006.01) | ||
| U.S. Cl. 560—25 [252/182.13; 252/182.22; 252/182.23; 525/523; 525/528; 528/28; 528/59; 528/68; 528/76; 528/87; 528/111; 528/120; 528/121; 528/122; 528/123; 528/407; 560/19; 560/26; 560/115; 560/155; 560/158; 560/159] | 8 Claims |
| 1. A process for preparing an amino-functional polyurethane prepolymer which comprises
a) preparing an NCO-functional polyurethane prepolymer by reacting one or more di- and/or polyisocyanates with at least one
isocyanate-reactive compound having a functionality of at least 1.5,
b) reacting the free NCO groups of the resulting polyurethane prepolymer with at least one compound containing one or more
silanol groups to give the corresponding silylurethane, and then
c) converting the silylurethane to an amino-functional polyurethane prepolymer by hydrolysis and/or alcoholysis with decarboxylation.
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