Patent US4152499A successfully refreshed from Google Patents.
US4152499A
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Polyisobutenes
Assignee: BASF SE
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Filing: 1977-12-23
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Granted: 1979-05-01
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Expires: 1997-12-23
Abstract
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.
Inventors
- 👤 Paul Boerzel
- 👤 Klaus Bronstert
- 👤 Friedrich Hovemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:33
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06; C08F4/12; C08F4/14; C08F10/00; C08F10/04; C08F10/08; C08F10/10; C08F8/00; C08F8/30; C08F8/32; C08F8/46; C08F2810/00; C08F2810/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
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.
Claim 2
Dependent Claim
56 words
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.
Claim 3
Dependent Claim
29 words
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.
Claim 4
Dependent Claim
65 words
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.
Claim 5
Dependent Claim
43 words
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.
Claim 6
Dependent Claim
23 words
A process as set forth in claim 3, wherein a C 4 -cut containing at least 35% by weight of isobutene is employed.
Claim 7
Dependent Claim
74 words
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 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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |