Polyisobutenes

• US 4,152,499 A
• Filed: 12/23/1977
• Issued: 05/01/1979
• Est. Priority Date: 01/22/1977
• Status: Expired due to Term

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Bronstert, Klaus, Boerzel, Paul, Hovemann, Friedrich
• Primary Examiner(s): Holler, Alan
• Application Number:
  US05/863,914
• Time in Patent Office: 494 Days
• Field of Search: 260/683.15 B, 526/237, 526/272, 526/348.7, 526/52.4
• US Class Current: 525/381
• CPC Class Codes: C08F 10/10 Isobutene
• CPC Class Codes: C08F 210/10 Isobutene
• CPC Class Codes: C08F 2810/30 leading to the formation or introduction of aliphatic or alicyclic unsaturated groups
• CPC Class Codes: C08F 4/14 Boron halides or aluminium halides; Complexes thereof with organic compounds containing oxygen
• CPC Class Codes: C08F 8/32 by reaction with amines
• CPC Class Codes: C08F 8/46 Reaction with unsaturated dicarboxylic acids or anhydrides thereof, e.g. maleinisation

Abstract

Isobutene polymers having a mean degree of polymerization P of from 10 to 100 and a proportion E of double bonds, capable of reaction with maleic anhydride, of from 60 to 90%, where E=100% corresponds to the calculated theoretical value for the case where each molecule of the isobutene polymer contains such a reactive double bond.

Claims

1. An isobutene polymer having a mean degree of polymerization P of from 10 to 100, wherein the proportion E of double bonds capable of reacting with maleic anhydride is from 60 to 90%, E=100% corresponding to the calculated theoretical value for the case where each molecule of the isobutene polymer contains such a reactive double bond.

2. An isobutene polymer as set forth in claim 1, wherein up to 20% by weight of monomers of 4 carbon atoms other than isobutene are present as copolymerized units.

3. A process for the manufacture of the isobutene polymer as set forth in claim 1 by polymerizing isobutene by means of boron trifluoride as the initiator, wherein the polymerization is carried out at from -50°

to +30°

C., from 1 to 20 mmoles of boron trifluoride are used per mole of isobutene and the mean polymerization time is confined to from 1 to 10 minutes.

4. A process as set forth in claim 3, wherein water or alcohol is employed as a co-catalyst for cationic polymerization together with boron trifluoride, said co-catalyst being used in an amount from 0.2 to 1.0 mole%, based on the amount of boron trifluoride.

5. A process as set forth in claim 3, wherein a C₄ -cut containing at least 35% by weight of isobutene is employed.

6. Petroleum additives which are manufactured by reacting the isobutene polymers set forth in claim 1 at 170°

to 250°

C. with a stoichiometric or slight excess amount of maleic anhydride and then reacting the resulting reaction product with a slight molar excess of an amine of the formula

space="preserve" listing-type="equation">H.sub.2 N--(R'"'"'--NH--).sub.m --R--(NH--R'"'"').sub.n --NH.sub.2

where R and R'"'"' are alkylene of 2 to 4 carbon atoms and m and n are integers from 1 to 5.