US4929699A
Expired / Lapsed
US
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Process for hydrogenation of polymers
Assignee: Dow Chemical Co
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Filing: 1989-05-09
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Granted: 1990-05-29
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Expires: 2009-05-09
Abstract
Abstract Ethylenically unsaturated polymers are hydrogenated by use of a bis(alkyl substituted cyclopentadienyl) lanthanide catalyst.
Inventors
- 👤 David R. Wilson
- 👤 James C. Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:44
CPC Classifications
C; C08; C08F; C08F8/00; C08C; C08C19/00; C08C19/02; C08F8/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
28 words
A process for hydrogenation of a polymer containing ethylenic unsaturation comprising contacting the polymer with a bis(alkyl substituted cyclopentadienyl) lanthanide-based compound and a hydrogenating agent under hydrogenation conditions.
Claim 2
Dependent Claim
28 words
A process for hydrogenation of a polymer containing ethylenic unsaturation comprising contacting the polymer with a bis(alkyl substituted cyclopentadienyl) lanthanide-based compound and a hydrogenating agent under hydrogenation conditions.
Claim 3
Dependent Claim
78 words
A process according to claim 1 wherein the bis(alkyl substituted cyclopentadienyl) lanthanidebased compound corresponds to the formula ##STR2## wherein Cp' is an alkyl substituted cyclopentadienyl ligand-(η 5 --R 5 C 5 ), wherein R is hydrogen, C 1-16 alkyl (including inertly substituted alkyl) or silyl with the proviso that in at least one occurrence R is not hydrogen: M is a lanthanide series element: and X is an inert substituent capable of replacement by hydrogen under hydrogenation conditions.
Claim 4
Dependent Claim
10 words
A process according to claim 2 wherein M is samarium.
Claim 5
Dependent Claim
27 words
A process according to claim 2 wherein X is C 1-16 alkyl, inertly substituted C 1-16 alkyl, silyl, C 1-6 alkyl substituted silyl or C 6-12 aryl.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein the bis(alkyl substituted cyclopentadienyl) lanthanidebased compound is a bis(pentamethyl cyclopentadienyl) lanthanide.
Claim 7
Dependent Claim
30 words
A process according to claim 1 wherein the bis(alkyl substituted cyclopentadienyl) lanthanidebased compound is (η 5 --(CH 3 ) 5 C 5 ) 2 Sm CH(Si(CH 3 ) 2 .
Claim 8
Dependent Claim
12 words
A process according to claim 1 wherein the hydrogenating agent is hydrogen.
Claim 9
Dependent Claim
16 words
A process according to Claim 1 wherein the polymer is a polymer of a conjugated diene.
Claim 10
Dependent Claim
18 words
A process according to claim 7 wherein the polymer is a homopolymer or copolymer of butadiene or isoprene.
Claim 11
Dependent Claim
22 words
A process according to claim 8 wherein the polymer is polybutadiene or a block copolymer of butadiene and a monovinylidene aromatic monomer.
Claim 12
Dependent Claim
17 words
A process according to claim 9 wherein the polymer is a block copolymer of styrene and butadiene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |