US4764560A
Expired / Lapsed
US
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Interpenetrating polymeric network comprising polytetrafluoroethylene and polysiloxane
Assignee: Donaldson Co Inc
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Filing: 1987-08-10
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Granted: 1988-08-16
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Expires: 2007-08-10
Abstract
Abstract There is provided a composition having interpenetrating matrices comprising (a) a first polymer network characterized by nodes interconnected by fibrils and (b) a second polymer network comprising diorganosiloxy units. In another aspect, there are provided compositions comprising an interpenetrating polymer network of polytetrafluoroethylene and polydiorganosiloxane. Methods for making the foregoing compositions are also provided.
Inventors
- 👤 Tyrone D. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:28
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; B; B29; B29C; B29C55/00; B29C55/005; C08L27/00; C08L27/02; C08L27/12; C08L27/18; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2083/00; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
48 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a polytetrafluoroethylene polymer network characterized by nodes interconnected by fibrils, and (b) a second polymer network consisting essentially of diorganosiloxy units wherein the weight ratio of component (b) to component (a) is from 1:100 to about 20:80.
Claim 2
Dependent Claim
48 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a polytetrafluoroethylene polymer network characterized by nodes interconnected by fibrils, and (b) a second polymer network consisting essentially of diorganosiloxy units wherein the weight ratio of component (b) to component (a) is from 1:100 to about 20:80.
Claim 3
Dependent Claim
40 words
A composition as in claims 1 wherein components (b) is formed from an addition curable silicone composition comprising (1) a polydiorganosiloxane having alkenyl unsaturation, (2) an organohydrogenpolysiloxane crosslinking agent, and (3) a catalyst for promoting crosslinking of (1) and (2).
Claim 4
Dependent Claim
23 words
A composition as in claim 2, wherein the viscosity of the polydiorganosiloxane having alkenyl unsaturation is less than 100,000,000 centipoise at 25° C.
Claim 5
Dependent Claim
27 words
A composition as in claim 2, wherein the viscosity of the polydiorganosiloxane having alkenyl unsaturation is from about 500 centipoise to about 50,000 centipoise at 25° C.
Claim 6
Dependent Claim
27 words
A composition as in claim 2, wherein the viscosity of the polydiorganosiloxane having alkenyl unsaturation is from about 3000 centipoise to about 6000 centipoise at 25° C.
Claim 7
Dependent Claim
24 words
A composition as in claim 3, wherein the organohydrogenpolysiloxane has a viscosity of from about 25 centipoise to about 10,000 centipoise at 25° C.
Claim 8
Dependent Claim
24 words
A composition as in claim 4, wherein the organohydrogenpolysiloxane has a viscosity of from about 100 centipoise to about 1000 centipoise at 25° C.
Claim 9
Dependent Claim
12 words
A composition as in claim 7, wherein the organohydrogenpolysiloxane is substantially linear.
Claim 10
Dependent Claim
12 words
A composition as in claim 7, wherein the organohydrogenpolysiloxane is a resin.
Claim 11
Dependent Claim
15 words
A composition as in claim 6, wherein the curing catalyst is a platinum containing complex.
Claim 12
Dependent Claim
12 words
A composition as in claim 10, further comprising a reinforcing organopolysiloxane resin.
Claim 13
Dependent Claim
23 words
A composition as in claim 11, wherein the reinforcing organopolysiloxane resin has vinyl unsaturation on monofunctional siloxane units, difunctional siloxane units, or both.
Claim 14
Dependent Claim
10 words
A composition as in claim 6, further comprising a filler.
Claim 15
Dependent Claim
12 words
A composition as in claim 13, wherein the filler is fumed silica.
Claim 16
Dependent Claim
11 words
A composition as in claim 6, further comprising a cure inhibitor.
Claim 17
Dependent Claim
19 words
A composition as in claim 15, wherein the cure inhibitor is a maleate or fumarate functional silane or polysiloxane.
Claim 18
Dependent Claim
17 words
A composition as in claim 1 wherein component (b) is formed from a condensation curable silicone composition.
Claim 19
Dependent Claim
47 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a first polymer network characterized by nodes interconnected by fibrils comprising polytetrafluoroethylene, and (b) a second polymer network comprising polydiorganosiloxane, wherein the weight ratio of component (b) to component (a) is from 1:100 to about 7:93.
Claim 20
Dependent Claim
47 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a first polymer network characterized by nodes interconnected by fibrils comprising polytetrafluoroethylene, and (b) a second polymer network comprising polydiorganosiloxane, wherein the weight ratio of component (b) to component (a) is from 1:100 to about 7:93.
Claim 21
Dependent Claim
17 words
A composition as in claim 18, wherein the polydiorganosiloxane is formed from an addition curable silicone composition.
Claim 22
Dependent Claim
17 words
A composition as in claim 18, wherein the polydiorganosiloxane is formed from a condensation curable silicone composition.
Claim 23
Dependent Claim
47 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a first polymer network characterized by nodes interconnected by fibrils comprising polytetrafluoroethylene, and (b) a second polymer network comprising polydiorganosiloxane, wherein the weight ratio of component (b) to component (a) is from 1/100 to about 20:80.
Claim 24
Dependent Claim
47 words
A composition having a porous microstructure of interpenetrating matrices, comprising: (a) a first polymer network characterized by nodes interconnected by fibrils comprising polytetrafluoroethylene, and (b) a second polymer network comprising polydiorganosiloxane, wherein the weight ratio of component (b) to component (a) is from 1/100 to about 20:80.
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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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |