US3709854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Petroleum resins
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-09-01
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Granted: 1973-01-09
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Expires: 1991-09-01
Abstract
Abstract In a process in which a C5 fraction from a cracked naphtha or gas oil is polymerized with the help of a Friedel Crafts catalyst to produce a petroleum resin, the resin properties are improved and polymerization time reduced by heating the C5 fraction to a temperature of at least 160*C for a period of up to 5 hours before the polymerization.
Inventors
- 👤 P Hepworth
- 👤 I Ripley
- 👤 N Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:38
CPC Classifications
C; C08; C08F; C08F240/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
The process of claim 1 in which isoprene present in the C5 stream is removed before the heating to a temperature of at least 160*C.
Claim 2
Dependent Claim
19 words
The process of claim 1 in which the C5 stream is heated at 170*C for 0.05 to 1.5 hours.
Claim 3
Dependent Claim
22 words
The process of claim 1 in which the Friedel Crafts catalyst is aluminum chloride complexed with hydrogen chloride in an aromatic solvent.
Claim 4
Dependent Claim
32 words
The process of claim 4 in which the aromatic solvent is toluene, xylene or a benzene which is substituted by at least one secondary or tertiary alkyl group or by cycloalkyl group.
Claim 5
Dependent Claim
21 words
A process of claim 1 in which the polymerization is carried out at a temperature in the range -100* to +100*C.
Claim 6
Dependent Claim
70 words
The process of claim 1 in which a C5 stream boiling in the range 10* to 80*C which has been distilled from a stream cracked naphtha is heated at 170*C for 0.05 to 1.5 hours and is then polymerized by contact with an aluminum chloride and hydrogen chloride complex in toluene or cumene at a temperature in the range -100* to +100*C to yield a petroleum resin which is recovered.
References Cited (Backward Citations)
US2734046A
Cited
US2092295A
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US2122826A
Cited
US2159220A
Cited
US2750359A
Cited
US2754288A
Cited
US2894937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |