US5312573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extruding mixtures of thermoplastic and thermoset materials
Assignee: Renewed Materials Industries Inc
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Filing: 1992-04-24
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Granted: 1994-05-17
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Expires: 2012-04-24
Abstract
Abstract Disclosed as one embodiment is a method of producing useful articles from ground whole tire waste, which includes the steps of continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into a continuously cooled, open-ended casting chamber.
Inventors
- 👤 James E. Rosenbaum
- 👤 Frank R. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:52
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/0026; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/07; B29C48/25; B29C48/275; B29C48/276; B29C48/88; B29C48/91; B29C48/911; B29K; B29K2021/00; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/26; B29L; B29L2030/00; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S264/00; Y10S264/911; Y10S264/915; Y10S264/92
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A method of producing useful articles from ground whole tire waste, comprising: continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into the interior of an elongated, open-ended casting chamber having a cross-section corresponding substantially to the cross-section of the desired useful article wherein the ground whole tire waste comprises rubber and metal debris; continuously cooling the exterior surface of the casting chamber to remove sufficient thermal energy from said casting chamber so that a dimensionally stable extrudate emerges from the open end of the casting chamber; and cutting the emerging extrudate to length
Claim 2
Independent Claim
99 words
A method of producing useful articles from ground whole tire waste, comprising: continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into the interior of an elongated, open-ended casting chamber having a cross-section corresponding substantially to the cross-section of the desired useful article wherein the ground whole tire waste comprises rubber and metal debris; continuously cooling the exterior surface of the casting chamber to remove sufficient thermal energy from said casting chamber so that a dimensionally stable extrudate emerges from the open end of the casting chamber; and cutting the emerging extrudate to length
Claim 3
Dependent Claim
127 words
A process for making an extruded article comprising the steps of: (a) forming a mixture comprising in the range of about 5-95 weight percent thermoplastic, in the range of about 0-20 weight percent reinforcing material and in the range of about 5-95 weight percent rubber particles and metal debris, all based on the total weight of the mixture; (b) heating the mixture to a temperature at least above the melting point of the thermoplastic and less than the degradation temperatures of both the thermoplastic and thermoset; (c) extruding the mixture through a die having a cross-sectional shape desired of the end product so that the final product will have a shore A hardness of at least about 70; and (d) cooling the extrudate into the final product.
Claim 4
Dependent Claim
127 words
A process for making an extruded article comprising the steps of: (a) forming a mixture comprising in the range of about 5-95 weight percent thermoplastic, in the range of about 0-20 weight percent reinforcing material and in the range of about 5-95 weight percent rubber particles and metal debris, all based on the total weight of the mixture; (b) heating the mixture to a temperature at least above the melting point of the thermoplastic and less than the degradation temperatures of both the thermoplastic and thermoset; (c) extruding the mixture through a die having a cross-sectional shape desired of the end product so that the final product will have a shore A hardness of at least about 70; and (d) cooling the extrudate into the final product.
Claim 5
Dependent Claim
63 words
The process of claim 2 wherein the mixture of step (a) comprises in the range of about 15 to about 50 weight percent thermoplastic, in the range of about 0 to about 20 weight percent reinforcing material and in the range of about 50 to about 85 weight percent rubber particles and metal debris, all based on the total weight of the mixture.
Claim 6
Dependent Claim
38 words
The process of claim 3 wherein the thermoplastic comprises at least one selected from the group consisting of polyolefins, polyvinyl chloride, nylons, fluorocarbons, polyurethane prepolymer, polystyrene, high impact strength polystyrene, cellulosic resins, acrylic resins, polyphenylene oxide, polyphenylene sulfide.
Claim 7
Dependent Claim
24 words
The process of claim 4 wherein the final product will have a screw retention of at least 300 lbs., as measured by ASTM E588.
Claim 8
Dependent Claim
24 words
The process of claim 4 wherein the thermoplastic comprises at least one selected from the group consisting of polyolefins, and high impact strength polystyrenes.
Claim 9
Dependent Claim
19 words
The process of claim 2 wherein the final product will have a shore A hardness of at least 80.
Claim 10
Dependent Claim
53 words
The process of claim 2 wherein the final product will have a shore A hardness of at least 90 and a screw retention of at least 500 lbs., as measured by ASTM E588 and the thermoplastic comprises at least one selected from the group consisting of polyethylene, polypropylene, and high impact strength polystyrenes.
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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) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |