US4426459A
Expired / Lapsed
US
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Process for decomposing vulcanized rubber
Assignee: Bridgestone Corp
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Filing: 1981-02-18
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Granted: 1984-01-17
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Expires: 2001-02-18
Abstract
Abstract A process for decomposing vulcanized rubber which comprises swelling 100 parts by weight of vulcanized rubber with 10-3000 parts by weight of an organic solution, and adding and mixing 0.1-20 parts by weight of an organic hydroperoxide (a) and of 0.001-1 mole equivalent per said (a) of at least one member (b) selected from the group consisting of copper salts, cobalt salts, and strongly alkaline compounds.
Inventors
- 👤 Yoji Watabe
- 👤 Hideo Takeichi
- 👤 Koichi Irako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:50
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; C08J11/22; C09; C09J; C09J117/00; C08J2321/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A process for decomposing particles of compounded rubber which comprises swelling 100 parts by weight of the particulate rubber with 10-3000 parts by weight of an organic solvent for vulcanized rubber, and adding and mixing 0.1-20 parts by weight of an organic hydroperoxide (a) and 0.001-1 mol equivalent per said (a) of at least one strongly alkaline compound (b) selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, and 1,8-diazabicyclo[5,4,0] undecene-7 and salts thereof, the decomposition being carried out at from 0° to 100° C.
Claim 2
Dependent Claim
88 words
A process for decomposing particles of compounded rubber which comprises swelling 100 parts by weight of the particulate rubber with 10-3000 parts by weight of an organic solvent for vulcanized rubber, and adding and mixing 0.1-20 parts by weight of an organic hydroperoxide (a) and 0.001-1 mol equivalent per said (a) of at least one strongly alkaline compound (b) selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, and 1,8-diazabicyclo[5,4,0] undecene-7 and salts thereof, the decomposition being carried out at from 0° to 100° C.
Claim 3
Dependent Claim
33 words
A process for decomposing compounded rubber according to claim 1 in which said organic hydroperoxide is a member selected from the group consisting of tert-butylhydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, p-menthane hydroperoxide, and 2,5-dimethylhexane-2,5-dihydroperoxide.
Claim 4
Dependent Claim
36 words
A process for decomposing compounded rubber according to claim 1 in which said (a) component is used in an amount in the range between 1-5 parts by weight per 100 parts by weight of compounded rubber.
Claim 5
Dependent Claim
31 words
A process for decomposing compounded rubber according to claim 1 in which said (b) component is used in an amount in the range between 0.01-0.5 mole equivalent per said (a) component.
Claim 6
Dependent Claim
21 words
A process for decomposing compounded rubber according to claim 1 in which said organic solvent is at least one halogenated hydrocarbon.
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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |