Patent ID: 7291681

Claim:
A polyisobutenamine of the formula I: R—X (I) where R is a polyisobutenyl radical having a number average molecular weight M N of from 500 to 1500 and a polydispersity M W /M N of no more than 1.3; and X is a radical of the formula II where k and l, independently of one another, are 0 or 1, A is methylene or phenylene, Z is oxygen or NR′, where R′ is hydrogen, alkyl, hydroxyalkyl, aminoalkyl, cycloalkyl, aryl, aralkyl or a group —Y—NR 1 R 2 , —Y— is a group where Alk is C 2 -C 4 -alkylene, p and q, independently of one another, are an integer from 0 to 25 and R″ is hydrogen, alkyl or aryl, and Alk′ is alkylene which may be interrupted by 1, 2 or 3 nonneighboring oxygen atoms, or is cycloalkylene, R 1 and R 2 , independently of one another, are hydrogen, alkyl, cycloalkyl, hydroxyalkyl, aryl or aralkyl or a group Y—NR 3 R 4 , where Y has the abovementioned meanings and R 3 and R 4 , independently of one another, are hydrogen, alkyl, cycloalkyl, hydroxyalkyl, aryl or aralkyl, R 3 and R 4 together with the nitrogen atom to which they are bonded form an unsubstituted or substituted, saturated heterocycle which may contain a further hetero atom selected from oxygen and nitrogen, R 1 and/or R 2 may also be R or —CH 2 —R if l is 0, R having the abovementioned meaning, or R 1 and R 2 together with the nitrogen atom to which they are bonded form an unsubstituted or substituted, saturated heterocycle which may contain a further hetero atom selected from oxygen and nitrogen, and the polyisobutenamine is obtained by a process wherein i) isobutene is polymerized in the presence of an initiator system comprising: a) a Lewis acid selected from covalent metal chlorides and semimetal chlorides, and b) at least one compound of the formula III, CH 3 —C(CH 3 ) 2 —[CH 2 —C(CH 3 ) 2 ] m -FG where m is 0, 1, 2, 3 or 4 and FG is halogen, OH, alkoxy, acyloxy, CH 2 C(CH 3 )CH 2 OH or a group in a solvent which is inert with respect to the Lewis acid, at a molar ratio of Lewis acid to compound III of from 5:1 to 1:20, to give a polyisobutene which contains at least 80 mol % of olefinic terminal groups and has a number average molecular weight M N of from 500 to 1500 and a polydispersity M W /M N of no more than 1.3, and ii) a radical having amino groups is introduced at the olefinic double bonds of the polyisobutene obtained in step i).