US4051080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reclaiming cured rubber scraps
Assignee: Piovanelli Macchinari E Impianti SpA
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Filing: 1975-05-06
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Granted: 1977-09-27
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Expires: 1995-05-06
Abstract
Abstract A method for reclaiming rubber in which the scraps to be reclaimed are treated in an autoclave at a temperature which is always below the temperature at which the scraps had been cured, with continuous agitation and under the pressure of a fluid (such as air) fed to the autoclave at the ambient air temperature. The processing time is a function of the other parameters and can easily be determined experimentally depending upon the nature of the material to be reclaimed and the plasticity to be obtained.
Inventors
- 👤 Temistocle Boccoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:29
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; B; B01; B01J; B01J19/00; B01J19/28; B01J3/00; B01J3/04; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/0009; B01J2219/18; B01J2219/187; C08J2321/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
A method of reclaiming rubber, consisting essentially of the combination of steps of heating scraps of cured rubber which have been freed of non-rubbery components, the compositions of the scraps being identical or compatible and the size of the scraps being substantially uniform, at a temperature below the curing temperature of said scraps in an autoclave which is heated externally while subjecting said scraps to agitation to effect even mixing and constant movement of said scraps, said heating and agitating of the scraps being undertaken in the presence of water in the form of steam equal to a percentage by weight of the scraps which percentage may vary from 5 to 10% wherein the exact amount of water relative to said scraps is controlled to determine the extent to which the scraps become plastic and in the presence of air, the volume of which is sufficient to effect a pressure within the autoclave of between 10 and 30 atmospheres, for a period of time sufficient to cause the contents of the autoclave to reach a temperature of about 110° C and continuing said treatment for a period of time of at least 15 minutes which is a period of time sufficient to plasticize said scraps.
Claim 2
Dependent Claim
35 words
A method according to claim 1, characterized in that the treatment of the scraps takes places at a temperature which is at least 20° C below the curing temperature of the scraps to be reclaimed.
Claim 3
Dependent Claim
24 words
A method according to claim 1, characterized in that the treatment of the scraps takes place under a pressure not higher than 40 atmospheres.
Claim 4
Dependent Claim
27 words
A method according to claim 1, characterized in that the treatment of the scraps in the autoclave and under pressure takes place at the ambient air temperature.
Claim 5
Dependent Claim
13 words
Reclaimed rubber from vulcanizates, as obtained by the method according to claim 1.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein agitation is effected to avoid centrifuging of the scraps.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |