US4075158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible product made from a poly(phenylene sulfide) blend and method of making same
Assignee: Phillips Petroleum Co
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Filing: 1975-12-15
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Granted: 1978-02-21
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Expires: 1995-12-15
Abstract
Abstract A flexible product having a stiffness of less than 10,000 psi as measured by ASTM D747-70 is made from a mixture of poly(phenylene sulfide) and a filler selected from a group of fillers with at least one of the fillers being polytetrafluoroethylene. The mixture is subjected to pressure to flow same through an orifice and upon exiting from the orifice the mixture is allowed to expand to form the product which is useful as a packing or gasket material.
Inventors
- 👤 Harold D. Coale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
C; C08; C08L; C08L81/00; C08L81/02; C08K; C08K3/00; C08K3/30; C08K7/00; C08K7/02; C08K7/04; C08L27/00; C08L27/02; C08L27/12; C08L27/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
An extruded product comprising: (a) an integral mass comprised of a mixture of poly(phenylene sulfide) in an amount of at least approximately 30 percent by weight of the total mixture weight and filler which includes at least polytetrafluoroethylene in an amount of at least approximately 20 percent by weight of the total mixture weight, said mixture having a stiffness of less than about 10,000 psi as measured by ASTM D747-70.
Claim 2
Dependent Claim
70 words
An extruded product comprising: (a) an integral mass comprised of a mixture of poly(phenylene sulfide) in an amount of at least approximately 30 percent by weight of the total mixture weight and filler which includes at least polytetrafluoroethylene in an amount of at least approximately 20 percent by weight of the total mixture weight, said mixture having a stiffness of less than about 10,000 psi as measured by ASTM D747-70.
Claim 3
Dependent Claim
32 words
The product as set forth in claim 1, wherein: (a) said filler also includes at least one filler selected from the group comprising: glass fibers, asbestos fibers, molybdenum disulfide and carbon fibers.
Claim 4
Independent Claim
151 words
A method of producing a flexible product from a mixture of poly(phenylene sulfide) and filler with the product having a stiffness less than about 10,000 psi as measured by ASTEM D747-70, said method comprising: (a) blending poly(phenylene sulfide) with a filler at least one of which is polytetrafluoroethylene to form a mixture, said poly(phenylene sulfide) is in an amount of at least about 30 percent by weight of the total mixture weight and said polytetrafluoroethylene is in an amount of at least about 20 percent by weight of the total mixture weight; (b) precuring said mixture a sufficient amount to lower the melt flow an adequate amount to produce a flexible extruded product; (c) heating said mixture; (d) pressurizing the heated mixture in a chamber; and (e) flowing the pressurized and heated mixture through an orifice and allowing the mixture to expand after exiting the orifice to produce a flexible extrudate.
Claim 5
Independent Claim
151 words
A method of producing a flexible product from a mixture of poly(phenylene sulfide) and filler with the product having a stiffness less than about 10,000 psi as measured by ASTEM D747-70, said method comprising: (a) blending poly(phenylene sulfide) with a filler at least one of which is polytetrafluoroethylene to form a mixture, said poly(phenylene sulfide) is in an amount of at least about 30 percent by weight of the total mixture weight and said polytetrafluoroethylene is in an amount of at least about 20 percent by weight of the total mixture weight; (b) precuring said mixture a sufficient amount to lower the melt flow an adequate amount to produce a flexible extruded product; (c) heating said mixture; (d) pressurizing the heated mixture in a chamber; and (e) flowing the pressurized and heated mixture through an orifice and allowing the mixture to expand after exiting the orifice to produce a flexible extrudate.
Claim 6
Dependent Claim
36 words
The method as set forth in claim 3 wherein: (a) said mixture is heated to a temperature of at least approximately 650° F; and (b) said mixture is pressurized between approximately 12,000 psi to 30,000 psi.
Claim 7
Dependent Claim
81 words
A method as set forth in claim 3 wherein: (a) said precuring is conducted in a first step at a temperature in the range of about 450° F to about 600° F for a time period in the range of about 4 hours to about 24 hours followed by a second step at a temperature in the range of about 675° F to about 750° F for a time period in the range of about 1/2 hour to about 2 hours.
Claim 8
Dependent Claim
27 words
A method as set forth in claim 5 wherein: (a) the expansion is at least about 2 times in cross-sectional dimension over a corresponding orifice cross-sectional dimension.
References Cited (Backward Citations)
US3487454A
Cited
US3884873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |