US3627837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grafting of preformed polymer side chains on metalated backbone polymer
Assignee: Bridgestone Firestone Inc
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Filing: 1968-11-25
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Granted: 1971-12-14
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Expires: 1988-11-25
Abstract
Abstract The process disclosed herein comprises the grafting of preformed polymer chains onto a metalated backbone polymer which has metal atoms such as lithium attached at various points along the polymer chain and the grafting preformed polymer chains have a functional group, such as a nitrile, or a ketone or an aldehyde group, which is capable of reacting with and replacing the metal atom attached to the backbone polymer. In this way grafted copolymers are prepared having sidebranches disposed according to the number and positioning of the metal atoms originally attached to the backbone polymer. In this way it is possible to make grafted copolymers of more uniform and more controllable side branching and therefore of improved properties.
Inventors
- 👤 Frederick J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/26; C08G; C08G81/00; C08G81/02; C08G81/021
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
The process of claim 1 in which said functional group is a nitrile group and the grafted copolymer is subsequently treated with water to convert the resultant imino radicals into keto radicals.
Claim 2
Dependent Claim
26 words
The process of claim 1 in which said backbone polymer is a polyethylene having an average of at least four atoms of lithium per polymer molecule.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which said backbone polymer is a polystyrene having an average of at least four atoms of lithium per polymer molecule.
Claim 4
Dependent Claim
26 words
The process of claim 1 in which said backbone polymer is a polybutadiene having an average of at least four atoms of lithium per polymer molecule.
Claim 5
Dependent Claim
23 words
The process of claim 1 in which said backbone polymer has an average of at least four atoms of lithium per polymer molecule.
Claim 6
Dependent Claim
19 words
The process of claim 6 in which said functional group attached to said preformed polymer is a nitrile group.
Claim 7
Dependent Claim
31 words
The process of claim 6 in which said functional group is attached to said preformed polymer is selected from the class consisting of nitrile, propionacetal, N-methylamide, chloroformyl, epoxide and ester groups.
Claim 8
Dependent Claim
13 words
The process of claim 8 in which said group is a propionacetal group.
Claim 9
Dependent Claim
13 words
The process of claim 8 in which said group is an N-methylamide group.
Claim 10
Dependent Claim
13 words
The process of claim 8 in which said group is a chloroformyl group.
Claim 11
Dependent Claim
13 words
The process of claim 8 in which said group is an epoxide group.
Claim 12
Dependent Claim
13 words
The process of claim 8 in which said group is an ester group.
Claim 13
Dependent Claim
38 words
The process of claim 8 in which said preformed polymer is further polymerized to add at least one repeating unit of a comonomer having a functional group therein selected from the class consisting of nitrile, ester and dialkylamide.
Claim 14
Dependent Claim
11 words
The process of claim 13 in which said comonomer is acrylonitrile.
References Cited (Backward Citations)
GB873656A
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US3048568A
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Cited
US3468972A
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FR1478225A
Cited
GB1144151A
Cited
US3492369A
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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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |