US4954576A
Expired / Lapsed
US
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Process for hydrogenating conjugated diene polymers
Assignee: Zeon Corp
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Filing: 1989-02-22
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Granted: 1990-09-04
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Expires: 2009-02-22
Abstract
Abstract A process for hydrogenating a conjugated diene polymer which comprises hydrogenating the carbon-carbon double bond of the conjugated diene polymer using a hydrogenation catalyst supported on a carrier, the carrier being an oxide of an element of Group IVa of the periodic table such as TiO 2 or ZrO 2 .
Inventors
- 👤 Yoichiro Kubo
- 👤 Kiyomori Ohura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:51
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A process for hydrogenating a conjugated diene polymer derived from 10 to 100% by weight of at least one conjugated diene monomer selected from the group consisting of 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene and 90 to 0% by weight of an ethylenically unsaturated monomer copolymerizable with said at least one conjugated diene which comprises hydrogenating the carbon-carbon double bond of the conjugated diene polymer in the presence of a hydrogenation catalyst supported on a carrier, the carrier being an oxide of an element of Group IVa of the periodic table.
Claim 2
Dependent Claim
90 words
A process for hydrogenating a conjugated diene polymer derived from 10 to 100% by weight of at least one conjugated diene monomer selected from the group consisting of 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene and 90 to 0% by weight of an ethylenically unsaturated monomer copolymerizable with said at least one conjugated diene which comprises hydrogenating the carbon-carbon double bond of the conjugated diene polymer in the presence of a hydrogenation catalyst supported on a carrier, the carrier being an oxide of an element of Group IVa of the periodic table.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which the carrier is TiO 2 or ZrO 2 .
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the hydrogenation catalyst is Pd or Rh.
Claim 5
Dependent Claim
13 words
The process of claim 1 in which the carrier is TiO 2 .
Claim 6
Dependent Claim
12 words
The process of claim 1 in which the carrier ZrO 2 .
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said ethylenically unsaturated monomer comprises an unsaturated nitrile.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the conjugated diene polymer is selected from the group consisting of polybutadiene, polyisoprene, butadiene/styrene copolymer and acrylonitrile/butadiene copolymer.
Claim 9
Dependent Claim
50 words
The process of claim 1 wherein the step of hydrogenating is carried out in a solution of the polymer in a solvent in which said polymer is soluble and at a temperature of from about 20° to 150° C. and a pressure of from 5 to 200 kg/cm 2 .
Claim 10
Dependent Claim
46 words
The process of claim 1 wherein said hydrogenation catalyst is supported on said carrier in an amount of from about 0.01 to 10% by weight, based on the carrier and is used in an amount of 10 to 5,000 ppm, relative to the conjugated diene polymer.
Claim 11
Dependent Claim
45 words
The process of claim 1 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
Claim 12
Dependent Claim
45 words
The process of claim 3 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
Claim 13
Dependent Claim
45 words
The process of claim 4 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
Claim 14
Dependent Claim
45 words
The process of claim 5 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
Claim 15
Dependent Claim
45 words
The process of claim 6 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
Claim 16
Dependent Claim
45 words
The process of claim 7 which further comprises separating and recovering the supported hydrogenation catalyst from the hydrogenated polymer and reusing the recovered catalyst for hydrogenation of additional conjugated diene monomer, said recovered supported catalyst having substantially the same activity as the fresh supported catalyst.
References Cited (Backward Citations)
US4690983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |