GB677675A - Improvements in or relating to the production of low-molecular weight isobutylene polymers - Google Patents
Improvements in or relating to the production of low-molecular weight isobutylene polymersInfo
- Publication number
- GB677675A GB677675A GB15303/50A GB1530350A GB677675A GB 677675 A GB677675 A GB 677675A GB 15303/50 A GB15303/50 A GB 15303/50A GB 1530350 A GB1530350 A GB 1530350A GB 677675 A GB677675 A GB 677675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- butene
- per cent
- fraction
- molecular weight
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F240/00—Copolymers of hydrocarbons and mineral oils, e.g. petroleum resins
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Lubricants (AREA)
Abstract
Polyisobutylene having a molecular weight above 10,000 and preferably between 10,000 and 20,000 is prepared by treating a light cracked petroleum fraction consisting of hydrocarbons having four carbon atoms in the molecule, and containing isobutylene together with substantial amounts of butene-1 and butene-2, to remove sufficient butene-2 that the ratio of secondary olefin to isobutylene is not substantially greater than 1 : 1 and the butene-2 content of the resulting product is not more than 20 per cent of the butene-1 content, and polymerizing the treated fraction at a temperature below 0 DEG C. in the presence of a halide polymerization catalyst, preferably boron fluoride or aluminium chloride. The butene-2 is preferably removed by fractionating the mixture to remove 50-90 per cent of the fraction overhead and using this overhead fraction for the polymerization. 5 per cent of substantially pure isobutylene may be added to the overhead fraction before polymerization, and about 0.1 per cent diethyl ether may also be added to increase the molecular weight. The polymers may be added to lubricating oils as viscosity improvers.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US677675XA | 1949-09-30 | 1949-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB677675A true GB677675A (en) | 1952-08-20 |
Family
ID=22078276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15303/50A Expired GB677675A (en) | 1949-09-30 | 1950-06-19 | Improvements in or relating to the production of low-molecular weight isobutylene polymers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB677675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076926A (en) | 1975-05-14 | 1978-02-28 | Imperial Chemical Industries Limited | Polymerization catalyst comprising aluminum halide and an alcohol or ether |
-
1950
- 1950-06-19 GB GB15303/50A patent/GB677675A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076926A (en) | 1975-05-14 | 1978-02-28 | Imperial Chemical Industries Limited | Polymerization catalyst comprising aluminum halide and an alcohol or ether |
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