Patent US5205973A successfully refreshed from Google Patents.
US5205973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precoagulation process for incorporating organic fibrous fillers
Assignee: EIDP Inc
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Filing: 1991-10-28
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Granted: 1993-04-27
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Expires: 2011-10-28
Abstract
Abstract Incorporation of fibrous filler into a styrene-butadiene rubber (SBR) by mixing a fibrous filler, SBR latex and a coagulant, feeding the resulting coagulated fiber-filled SBR latex to a dewatering extruder and through a flow restriction that applies back pressure sufficient that water present in the SBR is forced out of a vent upstream from the flow restriction and discharging the fiber-filled SBR from the extruder.
Inventors
- 👤 Fred Y. Kafka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/212; B; B29; B29C; B29C48/00; B29C48/25; B29C48/285; B29C48/288; B29C48/2886; B29C48/36; B29C48/50; B29C48/76; B29C48/762; B29C48/88; B29C48/919; C08J5/00; C08J5/04; B29C48/03; B29C48/286; B29K; B29K2105/00; B29K2105/06; B29K2105/16; C08J2309/00; C08J2309/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A process for incorporating fibrous filler into a styrene-butadiene rubber which comprises: a) mixing a styrene-butadiene rubber latex and about 1-400 parts by weight synthetic fibrous filler per 100 parts styrene-butadiene rubber, b) contacting the mixture with a coagulant for the styrene-butadiene rubber latex to form a coagulated fiberfilled rubber, c) feeding the coagulated fiber-filled styrene-butadiene rubber to a dewatering extruder and through a flow restriction in the extruder that applies back pressure sufficient that water present in the coagulated fiber-filled styrene-butadiene rubber is forced out of a vent provided in the extruder upstream from the flow restriction, and d) discharging the fiber-filled coagulated styrene-butadiene rubber from the extruder.
Claim 2
Dependent Claim
109 words
A process for incorporating fibrous filler into a styrene-butadiene rubber which comprises: a) mixing a styrene-butadiene rubber latex and about 1-400 parts by weight synthetic fibrous filler per 100 parts styrene-butadiene rubber, b) contacting the mixture with a coagulant for the styrene-butadiene rubber latex to form a coagulated fiberfilled rubber, c) feeding the coagulated fiber-filled styrene-butadiene rubber to a dewatering extruder and through a flow restriction in the extruder that applies back pressure sufficient that water present in the coagulated fiber-filled styrene-butadiene rubber is forced out of a vent provided in the extruder upstream from the flow restriction, and d) discharging the fiber-filled coagulated styrene-butadiene rubber from the extruder.
Claim 3
Dependent Claim
14 words
A process of claim 1 wherein the synthetic fibrous filler is a polyaramid fiber.
Claim 4
Dependent Claim
11 words
A process of claim 2 wherein the polyaramid is poly(paraphenylene terephthalamide).
Claim 5
Dependent Claim
42 words
A process of claim 1 wherein the coagulated fiber-filled styrenebutadiene rubber exiting the flow restriction is fed to a subatmospheric pressure zone to remove additional water form the styrene-butadiene rubber to substantially dry the rubber before it is discharged from the extruder.
Claim 6
Dependent Claim
15 words
A process of claim 1 wherein the fibrous filler is added as an aqueous slurry.
References Cited (Backward Citations)
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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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |