Patent US5294384A successfully refreshed from Google Patents.
US5294384A
Expired / Lapsed
US
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Thermoplastic composition and method for producing thermoplastic composition by melt blending carpet
Assignee: Ascend Performance Materials Operations LLC
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Filing: 1993-03-25
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Granted: 1994-03-15
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Expires: 2013-03-25
Abstract
Abstract The present invention is directed to a process for forming a thermoplastic composition from carpet wherein a carpet sample are melt blended without separating the carpet into its component parts. The process of the present invention produces a thermoplastic composition useful as a substitute for virgin thermoplastics in a variety of applications.
Inventors
- 👤 Donald J. David
- 👤 Jerauld L. Dickerson
- 👤 Thomas F. Sincock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:12
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B29B17/00; B29B17/0026; B29K; B29K2009/00; B29K2009/06; B29K2023/00; B29K2077/00; B29L; B29L2031/00; B29L2031/732; B29L2031/7322; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S264/00; Y10S264/911; Y10S264/916
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A process for forming a thermoplastic composition from at least one carpet sample comprising a plurality of polymeric components, said sample including a plurality of nylon tufts, at least one polyolefin backing and styrene-butadiene rubber adhesive, said process comprising the steps of: (a) providing at least one unseparated carpet sample; and (b) melt blending said unseparated carpet sample under conditions of temperature, pressure and intensive mixing sufficient to produce a thermoplastic composition wherein all of said polymeric components are reduced to a flowable liquid form.
Claim 2
Dependent Claim
85 words
A process for forming a thermoplastic composition from at least one carpet sample comprising a plurality of polymeric components, said sample including a plurality of nylon tufts, at least one polyolefin backing and styrene-butadiene rubber adhesive, said process comprising the steps of: (a) providing at least one unseparated carpet sample; and (b) melt blending said unseparated carpet sample under conditions of temperature, pressure and intensive mixing sufficient to produce a thermoplastic composition wherein all of said polymeric components are reduced to a flowable liquid form.
Claim 3
Dependent Claim
25 words
A process in accordance with claim 1 wherein said melt blending step is performed at a temperature of about 250° C. and about 260° C.
Claim 4
Dependent Claim
25 words
A process in accordance with claim 2 wherein said melt blending step is performed at a pressure of about 350 psi to about 450 psi.
Claim 5
Dependent Claim
28 words
A process in accordance with claim 3 wherein said melt blending step is performed at a shear rate of between about 200 to about 400 sec -1 .
Claim 6
Dependent Claim
25 words
A process in accordance with claim 4 wherein said melt blending step is conducted in a counter-rotating twin screw extruder operating at about 240 rpm.
Claim 7
Dependent Claim
14 words
A process in accordance with claim 1 wherein said carpet sample is used carpet.
Claim 8
Dependent Claim
22 words
A process in accordance with claim 1 wherein said melt blending step is conducted in the absence of a separately added compatabilizer.
References Cited (Backward Citations)
US3562373A
Cited
DE2425751A1
Cited
US4028159A
Cited
US4158646A
Cited
US4020020A
Cited
US4105593A
Cited
JPS54117579A
Cited
JPS58119821A
Cited
US4546128A
Cited
JPS60185823A
Cited
JPS60206868A
Cited
JPS60219016A
Cited
JPS6357355A
Cited
US4775697A
Cited
DE3816894A1
Cited
US5169876A
Cited
US5061735A
Cited
US5145617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |