Patent US5278245A successfully refreshed from Google Patents.
US5278245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic elastomers
Assignee: Kraton Polymers US LLC
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Filing: 1992-10-07
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Granted: 1994-01-11
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Expires: 2012-10-07
Abstract
Abstract Block copolymers of particular structure comprising blocks of polymerized alkenyl aromatic compound and polymerized conjugated alkadiene, as well as selectively hydrogenated derivatives thereof, are functionalized by the presence of additional polar blocks of polymerized alkyl methacrylate.
Inventors
- 👤 Donn A. DuBois
- 👤 Carl L. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:51
CPC Classifications
C; C08; C08F; C08F293/00; C08F297/00; C08F297/02; C08F297/04; C08F297/048
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
144 words
A block polymer comprising (1) one block of at least 80% by mole polymerized alkenyl aromatic compound, (2) an internal block of at least 90% by mole hydrogenated polymerized conjugated alkadiene, (3) a terminal block of polymerized alkyl methacrylate polymerized through the ethylenic unsaturation thereof, wherein the block copolymer has the formula A--B--C wherein A is the block of the polymerized alkenyl aromatic compound, B is the internal block of the hydrogenated, polymerized conjugated alkadiene, and C is the terminal block of the polymerized alkyl methacrylate, and wherein the block of the polymerized alkenyl aromatic compound has a number average molecular weight from about 5,000 to about 50,000, the internal block of the hydrogenated, polymerized conjugated diene has a number average molecular weight from about 20,000 to about 500,000, and the alkyl moiety of the alkyl methacrylate comprises up to 14 carbon atoms, inclusive.
Claim 2
Dependent Claim
144 words
A block polymer comprising (1) one block of at least 80% by mole polymerized alkenyl aromatic compound, (2) an internal block of at least 90% by mole hydrogenated polymerized conjugated alkadiene, (3) a terminal block of polymerized alkyl methacrylate polymerized through the ethylenic unsaturation thereof, wherein the block copolymer has the formula A--B--C wherein A is the block of the polymerized alkenyl aromatic compound, B is the internal block of the hydrogenated, polymerized conjugated alkadiene, and C is the terminal block of the polymerized alkyl methacrylate, and wherein the block of the polymerized alkenyl aromatic compound has a number average molecular weight from about 5,000 to about 50,000, the internal block of the hydrogenated, polymerized conjugated diene has a number average molecular weight from about 20,000 to about 500,000, and the alkyl moiety of the alkyl methacrylate comprises up to 14 carbon atoms, inclusive.
Claim 3
Dependent Claim
20 words
The block polymer of claim 1 wherein the alkenyl aromatic compound is ##STR5## wherein R independently is hydrogen or methyl.
Claim 4
Dependent Claim
19 words
The block polymer of claim 2 wherein the conjugated alkadiene is ##STR6## wherein R independently is hydrogen or methyl.
Claim 5
Dependent Claim
17 words
The block polymer of claim 3 wherein the alkyl moiety of the alkyl methacrylate is branched butyl.
Claim 6
Dependent Claim
14 words
The block polymer of claim 4 wherein the conjugated alkadiene is butadiene or isoprene.
Claim 7
Dependent Claim
13 words
The block polymer of claim 5 wherein the alkenyl aromatic compound is styrene.
Claim 8
Dependent Claim
17 words
The block polymer of claim 6 wherein the alkyl moiety of the alkyl methacrylate is t-butyl methacrylate.
Claim 9
Dependent Claim
12 words
The block polymer of claim 7 wherein the conjugated alkadiene is butadiene.
Claim 10
Dependent Claim
12 words
The block polymer of claim 7 wherein the conjugated alkadiene is isoprene.
Claim 11
Dependent Claim
18 words
The block polymer of claim 1 wherein at least 90% of the carbon-carbon aliphatic unsaturation has been hydrogenated.
Claim 12
Dependent Claim
20 words
The block polymer of claim 10 wherein the alkenyl aromatic compound is ##STR7## wherein R independently is hydrogen or methyl.
Claim 13
Dependent Claim
18 words
The block polymer of claim 11 wherein the alkadiene is ##STR8## wherein R independently is hydrogen or methyl.
Claim 14
Dependent Claim
17 words
The block polymer of claim 12 wherein the alkyl moiety of the alkyl methacrylate is branched butyl.
Claim 15
Dependent Claim
14 words
The block polymer of claim 13 wherein the conjugated alkadiene is butadiene or isoprene.
Claim 16
Dependent Claim
13 words
The block polymer of claim 14 wherein the alkenyl aromatic compound is styrene.
Claim 17
Dependent Claim
16 words
The block polymer of claim 15 wherein the alkyl moiety of the alkyl methacrylate is t-butyl.
Claim 18
Dependent Claim
12 words
The block polymer of claim 16 wherein the conjugated alkadiene is butadiene.
Claim 19
Dependent Claim
12 words
The block polymer of claim 16 wherein the conjugated alkadiene is isoprene.
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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) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |