Patent US4038474A successfully refreshed from Google Patents.
US4038474A
Expired / Lapsed
US
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Process for preparing novel petroleum resin employing AlRX2 and alkyl halide or hydrogen halide
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1975-04-07
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Granted: 1977-07-26
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Expires: 1995-04-07
Abstract
Abstract A novel petroleum resin having not only a relatively low molecular weight but a narrow molecular weight distribution and having excellent characteristics as a tackifier particularly suitable for use in hot-melt adhesives and also suitable for synthetic rubbers, adhesive tapes, sealants, and the like, which resin is obtained by copolymerizing 20 to 80 parts by weight of a so-called spent C 4 - or C 5 -fraction obtained by removing most of the dienic constituents from the fractions mainly of C 4 or C 5 carbon atoms produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative with a catalyst system comprising an organoaluminum compound represented by the general formula AlRX 2 (wherein R is an alkyl group having 1 to 4 carbon atoms and X is a halogen atom) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst, in a hydrocarbon solvent at a temperature of 0° to 60° C.
Inventors
- 👤 Ken-ichi Kudo
- 👤 Yoshihiko Kitagawa
- 👤 Hideyuki Kuribayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:16
CPC Classifications
C; C08; C08F; C08F240/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A process for manufacturing a petroleum resin, characterized by copolymerizing 20 to 80 parts by weight of a so-called spent C 4 - or C 5 -fraction obtained by removing most of the dienic constituents from the fraction comprising compounds having mainly four or five carbon atoms produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative with a catalyst system comprising an organoaluminum compound represented by the general formula AlRX 2 (wherein R is an alkyl group having 1 to 4 carbon atoms and X is a halogen atom) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst, in a hydrocarbon solvent at a temperature of 0° to 60° C.
Claim 2
Dependent Claim
122 words
A process for manufacturing a petroleum resin, characterized by copolymerizing 20 to 80 parts by weight of a so-called spent C 4 - or C 5 -fraction obtained by removing most of the dienic constituents from the fraction comprising compounds having mainly four or five carbon atoms produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative with a catalyst system comprising an organoaluminum compound represented by the general formula AlRX 2 (wherein R is an alkyl group having 1 to 4 carbon atoms and X is a halogen atom) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst, in a hydrocarbon solvent at a temperature of 0° to 60° C.
Claim 3
Dependent Claim
33 words
A process for manufacturing a petroleum resin according to claim 1, wherein the total dienic constituent content of the spent C 4 - or C 5 -fraction is 5% by weight or less.
Claim 4
Dependent Claim
53 words
A process for manufacturing a petroleum resin according to claim 1, wherein 20 to 80 parts by weight of the spent C 4 -fraction obtained by removing dienic constituents from a C 4 -fraction produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative are copolymerized.
Claim 5
Dependent Claim
32 words
A process for manufacturing a petroleum resin according to claim 1, wherein styrene and/or the styrene derivative is styrene, α-methylstyrene, vinyltoluene, or dimethylstyrene or a mixture of two or more of these.
Claim 6
Dependent Claim
45 words
A process for manufacturing a petroleum resin according to claim 1, wherein the monomer composition is 40 to 60 parts by weight of the spent C 4 - or C 5 -fraction and 60 to 40 parts by weight of styrene and/or a styrene derivative.
Claim 7
Dependent Claim
18 words
A process for manufacturing a petroleum resin according to claim 1, wherein the organoaluminum compound is ethylaluminum dichloride.
Claim 8
Dependent Claim
31 words
A process for manufacturing a petroleum resin according to claim 1, wherein the amount to be used of the organoaluminum compound is 0.5 to 3% by weight based on total monomer.
Claim 9
Dependent Claim
21 words
A process for manufacturing a petroleum resin according to claim 1, wherein the alkyl halide is tert-butyl chloride or tert-butyl bromide.
Claim 10
Dependent Claim
21 words
A process for manufacturing a petroleum resin according to claim 1, wherein the hydrogen halide is hydrogen chloride or hydrogen bromide.
Claim 11
Dependent Claim
30 words
A process for manufacturing a petroleum resin according to claim 1, wherein the molar ratio of the co-catalyst to the organoaluminum compound is in the range from 0.1 to 1.
Claim 12
Dependent Claim
29 words
A process for manufacturing a petroleum resin according to claim 1, wherein the molar ratio of co-catalyst to the organoaluminum compound is in the range of 0.4 to 0.8.
Claim 13
Dependent Claim
24 words
A process for manufacturing a petroleum resin according to claim 1, wherein the catalysts are mixed with the monomer components in a polymerization reactor.
Claim 14
Dependent Claim
46 words
A process for manufacturing a petroleum resin according to claim 1, wherein the hydrocarbon solvent is an aliphatic hydrocarbon selected from hexane, heptane, and other paraffins; an aromatic hydrocarbon selected from benzene, toluene, xylene, and ethylbenzene; cyclohexane, or a mixture of two or more of these.
Claim 15
Dependent Claim
34 words
A process for manufacturing a petroleum resin according to claim 1, wherein the weight ratio of the hydrocarbon solvent to be used to the monomer components is in the range from 0.5 to 2.0.
Claim 16
Dependent Claim
27 words
A process for manufacturing a petroleum resin according to claim 1, wherein copolymerization is carried out at a temperature in the range from 10° to 50° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |