| US 7,579,412 B2 | ||
| Method for producing carboxyl-terminated polyisobutenes | ||
| Arno Lange, Bad Duerkheim (Germany); Helmut Mach, Heidelberg (Germany); Hans Peter Rath, Gruenstadt (Germany); Ulrich Karl, Ludwigshafen (Germany); Bela Ivan, Budapest (Hungary); Peter Werner Groh, Budapest (Hungary); Zsuzsanna Tamara Nagy, Budapest (Hungary); and Viktoria Palfi, Budapest (Hungary) | ||
| Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany) | ||
| Appl. No. 10/556,808 PCT Filed May 14, 2004, PCT No. PCT/EP2004/005202 § 371(c)(1), (2), (4) Date Nov. 15, 2005, PCT Pub. No. WO2004/101631, PCT Pub. Date Nov. 25, 2004. |
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| Claims priority of application No. 103 22 164 (DE), filed on May 16, 2003. | ||
| Prior Publication US 2006/0276588 A1, Dec. 07, 2006 | ||
| Int. Cl. C08C 19/04 (2006.01) | ||
| U.S. Cl. 525—383 [525/387; 525/388] | 8 Claims |
| 1. A process for preparing carboxyl-terminated polyisobutenes, comprising:
reacting ozone with a polyisobutene of formula I
A(M-B)n (I)
and
carrying out a thermal after-treatment by heating the reaction product obtained from the ozone reaction to from 60 to 150°
C.,
wherein
A is a radical derived from a polymerization initiator,
M is a polymer chain comprising repeating units of the formula II
[CH2—C(CH3)2] (II),
and
B is a radical of the formula III or IV
—CH2—CH═CH2 (III)
—CH═CR1R2 (IV)
wherein
R1 and R2 are each H, C1-C4-alkyl or phenyl, and
n is from 1 to 6, and
wherein the thermal heat treatment of the reaction product obtained from the ozone reaction is optional when B is a radical
of formula IV and R1 and R2 are phenyl.
|