US4257925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics material incorporating reclaimed tire rubber
Assignee: AIR PRODUCTS Ltd NEW MALDEN
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Filing: 1979-05-30
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Granted: 1981-03-24
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Expires: 1999-05-30
Abstract
Abstract Large quantities of reclaimed tire rubber can be incorporated into plastics material without seriously impairing its impact strength by a method which comprises the steps of swelling the reclaimed tire rubber with a quantity of monomer which is insufficient to saturate the reclaimed tire rubber and polymerizing the swollen mass. The method is effective despite the multiplicity of additives such as extenders, antioxidants and lubricants present in the reclaimed tire rubber. The preferred monomer is styrene. In certain cases the plastics material can be electroplated after suitable chemical treatment.
Inventors
- 👤 Graham F. Freeguard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08F; C08F279/00; C08F279/02; C08J2321/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A method of making plastics material which method is characterized in that it comprises swelling reclaimed tyre rubber which has been reduced to an average particle size of between 5 and 3,000 microns by contacting with a quantity of monomer which is insufficient to saturate said reclaimed tyre rubber for a period time of less than about 30 minutes and polymerizing the swollen mass.
Claim 2
Dependent Claim
24 words
A method according to claim 1, characterized in that said reclaimed rubber comprises between 18% and 90% of the weight of said swollen mass.
Claim 3
Dependent Claim
24 words
A method according to claim 2, characterized in that said reclaimed rubber comprises between 25 and 70% of the weight of said swollen mass.
Claim 4
Dependent Claim
24 words
A method according to claim 3, characterized in that said reclaimed rubber comprises between 25 and 50% of the weight of said swollen mass.
Claim 5
Dependent Claim
26 words
A method according to claim 1, characterized in that prior to swelling said reclaimed rubber has an average particle size of between 200 and 1,000 microns.
Claim 6
Dependent Claim
26 words
A method according to claim 5, characterized in that prior to swelling said reclaimed rubber has an average particle size of between 200 and 500 microns.
Claim 7
Dependent Claim
16 words
A method according to claim 1, characterized in that said monomer comprises a vinyl aromatic compound.
Claim 8
Dependent Claim
13 words
A method according to claim 7, characterized in that said monomer is styrene.
Claim 9
Dependent Claim
20 words
A method according to claim 1, characterized in that said monomer is liquid and is sprayed onto said reclaimed rubber.
References Cited (Backward Citations)
US2853742A
Cited
US3042634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |