US4673714A
Expired / Lapsed
US
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Olefin hydrogenation catalyst, process for hydrogenating polymers with the catalyst, and hydrogenated block copolymers produced by said processes
Assignee: Asahi Kasei Corp
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Filing: 1985-04-10
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Granted: 1987-06-16
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Expires: 2005-04-10
Abstract
Abstract An olefin hydrogenation catalyst containing as an essential component a compound represented by the formula: ##STR1## The catalyst is capable of selectively hydrogenating the unsaturated double bonds of the diene units of a conjugated diene polymer or copolymer having a number average molecular weight of 500 to 1,000,000, particularly a styrenebutadiene block copolymer comprising at least one polymer block A composed mainly of styrene and at least one polymer block B composed mainly of 1,3-butadiene and/or isoprene. The hydrogenated block copolymer obtained from such selective hydrogenation is useful as an elastomer, a thermoplastic elastomer or a thermoplastic resin having excellent weather resistance and oxidation resistance.
Inventors
- 👤 Yasushi Kishimoto
- 👤 Tetsuo Masubuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:06
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/02; B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2282; B01J31/2295; C08F; C08F8/00; C08F8/04; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645; B01J2531/00; B01J2531/40; B01J2531/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A process for hydrogenating a diene polymer or copolymer, which comprises contacting said polymer or copolymer having a number average molecular weight of 500 to 1,000,000, in the absence of a hydrocarbon lithium compound, with hydrogen in an inert organic solvent in the presence of at least one of a titanocene diaryl compound having the general formula (I): ##STR5## wherein R 1 to R 6 are independent hydrogen atoms or alkyl groups of 1 to 4 carbon atoms, and at least one of R 1 to R 3 and at least one of R 4 to R 6 are alkyl groups and at least one of R 1 to R 3 and at least one of R 4 to R 6 are hydrogen atoms, to selectively hydrogenate 50% or more of the unsaturated double bonds of said polymer or copolymer.
Claim 2
Dependent Claim
140 words
A process for hydrogenating a diene polymer or copolymer, which comprises contacting said polymer or copolymer having a number average molecular weight of 500 to 1,000,000, in the absence of a hydrocarbon lithium compound, with hydrogen in an inert organic solvent in the presence of at least one of a titanocene diaryl compound having the general formula (I): ##STR5## wherein R 1 to R 6 are independent hydrogen atoms or alkyl groups of 1 to 4 carbon atoms, and at least one of R 1 to R 3 and at least one of R 4 to R 6 are alkyl groups and at least one of R 1 to R 3 and at least one of R 4 to R 6 are hydrogen atoms, to selectively hydrogenate 50% or more of the unsaturated double bonds of said polymer or copolymer.
Claim 3
Dependent Claim
12 words
A process according to claim 1, wherein said titanocene comprises di-p-tolylbis(η-cyclopentadienyl) titanium.
Claim 4
Dependent Claim
29 words
A process according to claim 2, wherein the hydrogenation catalyst is present in an amount of from 0.005 to 20 mM per 100 g of said polymer or copolymer.
Claim 5
Dependent Claim
30 words
A process according to claim 3, wherein said hydrogenation is conducted at a temperature of 40° to 120° C. and at a pressure of 2 to 30 kg/cm 2 .
Claim 6
Dependent Claim
18 words
A process according to claim 1, wherein said (co)polymer is a (co)polymer composed mainly of 1,3-butadiene and/or isoprene.
Claim 7
Dependent Claim
67 words
A process according to claim 1, wherein the copolymer is a block copolymer containing at least one polymer block A composed mainly of styrene and at least one polymer block B composed mainly of 1,3-butadiene and/or isoprene, the content of the blocks A in the block copolymer being 0 to 90% by weight and the 1,2-vinyl content in the blocks B being 20 to 70% by weight.
Claim 8
Dependent Claim
29 words
A process according to claim 6, wherein 90% or more of the 1,3-butadiene units and/or the isoprene units and 5% or less of the styrene units are selectively hydrogenated.
Claim 9
Dependent Claim
129 words
A process according to claim 6, wherein the block copolymer contains at least two polymer blocks A each having a number average molecular weight of 2,000 to 60,000 and at least two polymer blocks B each having a number average molecular weight of 2,500 to 300,000, at least one of the blocks B being present at the terminal of the copolymer chain, the content of the terminal block B being 3 to 30% by weight based on the weight of the entire copolymer and 4 to 50% by weight based on the weight of the total blocks B, the weight ratio of the terminal block B to the total blocks A being 0.1 to 1.0, and the 1,2-vinyl content in the blocks B being 20 to 50% by weight.
Claim 10
Dependent Claim
29 words
A process according to claim 8, wherein 90% or more of the 1,3-butadiene units and/or the isoprene units and 5% or less of the styrene units are selectively hydrogenated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |