Patent US3969309A successfully refreshed from Google Patents.
US3969309A
Expired / Lapsed
US
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Silicone channel sealant
Assignee: General Electric Co
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Filing: 1975-04-30
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Granted: 1976-07-13
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Expires: 1995-04-30
Abstract
Abstract A silicone channel sealant with improved solvent and water resistance comprising a diorganopolysiloxane of 50 to 200,000 centipoise viscosity and blends of diorganopolysiloxanes wherein powdered polytetrafluoroethylene, treated and untreated silica filler, a titanate of the formula (RO) 4 Ti, where R is selected from alkyl radicals and haloalkyl radicals, and an organic compound containing at least one hydroxy group are present as a water resistance additive. In addition to the above basic ingredients, there can be present in the composition of the present case a silicate, a boron compound, styrene beads, a polyether, and optionally as a corrosion resistant additive such as, zinc chromium salts or iron oxide. The above channel sealant which is desirable as a channel sealant for fuel tanks of aircraft has the advantageous properties that it is both solvent resistant, water resistant, has good consistency and does not flow at low pressures but is easily injectable.
Inventors
- 👤 John H. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/34; C08K3/36; C08K3/38; C08K5/00; C08K5/04; C08K5/05; C08K5/55; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L71/00; C08L71/02; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/22; C08G77/26
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
117 words
A silicone channel sealant comprising 100 parts by weight of a diorganopolysiloxane of 50 to 200,000 centipoise viscosity at 25°C, where the organo groups are selected from monovalent hydrocarbon radicals and cyanoalkyl, 10 to 150 parts by weight of powdered polytetrafluoroethylene, 4 to 25 parts by weight of untreated silica, 4 to 25 parts of a treated silica, 0.3 to 2.0 parts by weight of a titanate of the formula, (RO).sub.4 Ti where R is selected from alkyl radicals and haloalkyl radicals of 2 to 5 carbon atoms, from 0.3 to 2.0 parts by weight of an aliphatic hydrocarbon compound containing at least one hydroxy group and from 10 to 50 parts by weight of styrene beads.
Claim 2
Dependent Claim
117 words
A silicone channel sealant comprising 100 parts by weight of a diorganopolysiloxane of 50 to 200,000 centipoise viscosity at 25°C, where the organo groups are selected from monovalent hydrocarbon radicals and cyanoalkyl, 10 to 150 parts by weight of powdered polytetrafluoroethylene, 4 to 25 parts by weight of untreated silica, 4 to 25 parts of a treated silica, 0.3 to 2.0 parts by weight of a titanate of the formula, (RO).sub.4 Ti where R is selected from alkyl radicals and haloalkyl radicals of 2 to 5 carbon atoms, from 0.3 to 2.0 parts by weight of an aliphatic hydrocarbon compound containing at least one hydroxy group and from 10 to 50 parts by weight of styrene beads.
Claim 3
Dependent Claim
48 words
The channel sealant of claim 1 wherein there is present from 0.5 to 10 parts by weight of a high temperature stabilizing boron additive selected from the class consisting of boric acid, trimethoxy boroxime and trialkyl borates where the alkyl group contains from 1 to 5 carbon atoms.
Claim 4
Dependent Claim
74 words
The channel sealant of claim 2 wherein there is present from 0.1 to 5 parts by weight of a stabilizing additive which is an alkyl silicate of the formula, R.sup.1 Si (OR.sup.2).sub.3 where R 1 is selected from the class consisting of alkyl and alkoxy radicals of 1 to 8 carbon atoms and R 2 is selected from the class consisting of alkyl, aryl, haloalkyl and alkenyl radicals of 1 to 8 carbon atoms.
Claim 5
Dependent Claim
58 words
The channel sealant of claim 3 where there is present from 5 to 40 parts by weight of a diorganopolysiloxane having a viscosity of 1,000,000 to 200,000,000 centipoise at 25°C, where the organo groups are selected from alkyl of 1 to 5 carbon atoms and cyanoalkyl of 2 to 5 carbon atoms wherein the polymer is dimethylvinyl end-stopped.
Claim 6
Dependent Claim
20 words
The channel sealant of claim 4 wherein there is present from 100 to 10,000 parts per million of a peroxide.
Claim 7
Dependent Claim
94 words
The channel sealant of claim 5 wherein there is present a polyether stabilizer at a concentration of 0.1 to 2 parts by weight of the formula, R.sup.3 O (C.sub.a H.sub.2a O).sub.x (C.sub.b H.sub.2b O).sub.y H where R 3 is a member selected from the class consisting of hydrogen, and lower alkyl radicals of 1 to 7 carbon atoms, a and b are integers equal to from 1 to 4, inclusive, x is an integer equal to from about 4 to 50, inclusive, and y is an integer equal to from 0 to 50 inclusive.
Claim 8
Dependent Claim
60 words
The channel sealant of claim 6 wherein there is present from 0.1 to 8 parts by weight of a corrosion resistant additive selected from the class consisting of iron oxide and zinc salts of C 2 O 2 , C 2 O 4 , C 2 O 6 , C 2 O 3 , and C 2 O 7 .
Claim 9
Dependent Claim
53 words
The channel sealant of claim 1 wherein the diorganopolysiloxane can be blends of diorganopolysiloxanes and that the final blend of 50 to 200,000 centipoise viscosity in the polymer have the formula, R.sub.n.sup.4 SiO.sub.(4-n)/2 where R 4 is selected from the class consisting of methyl and cyanoethyl, and n varies from 2.001 to 2.05.
Claim 10
Dependent Claim
59 words
The channel sealant of claim 1 wherein the silica filler is selected from silica aerogel, fumed silica and precipitated silica and the treated silica is treated prior to incorporation in the composition with cyclicpolysiloxanes of the formula, (R.sup.5 SiO).sub.z where R 5 is an alkyl radical of 1 to 8 carbon atoms and z varies from 3 to 10.
Claim 11
Dependent Claim
34 words
The channel sealant of claim 1 wherein the aliphatic hydrocarbon compound containing at least one hydroxy group is selected from the class consisting of aliphatic diols and triols of 5 to 12 carbon atoms.
Claim 12
Dependent Claim
66 words
The channel sealant of claim 1 wherein the styrene beads are styrene beads where 10 to 40% by weight of said total beads have a mesh size of 1 to 50, 10 to 40% by weight of said total beads have a mesh size of 50 to 100 and 10 to 20% by weight of said total beads have a mesh size of 100 to 500.
Claim 13
Dependent Claim
12 words
The channel sealant of claim 5 where the peroxide is dicumyl peroxide.
Claim 14
Dependent Claim
26 words
The channel sealant of claim 10 wherein the titanate compound is tetraisopropyl titanate and the aliphatic hydrocarbon compound containing at least one hydroxy group is 2-ethyl,1,3-hexanediol.
Claim 15
Dependent Claim
144 words
A process for forming a channel sealant comprising (a) mixing 100 parts by weight of a diorganopolysiloxane of 50 to 200,000 centipoise viscosity at 25°C, where the organo groups are selected from monovalent hydrocarbon radicals and cyanoalkyl, 10 to 150 parts by weight of powdered polytetrafluoroethylene, 4 to 25 parts by weight of untreated silica, 0.3 to 2.0 parts by weight of a titanate of the formula, (RO).sub.4 Ti where R is selected from alkyl radicals and haloalkyl radicals of 2 to 5 carbon atoms and an aliphatic hydrocarbon compound containing at least one hydroxy group, (b) heating the resulting mixture to 100° to 200°C from 1 to 10 hours under a nitrogen atmosphere while continuing the agitation of the mixture, (c) cooling the mixture to room temperature, and (d) mixing into resulting composition from 10 to 50 parts by weight of styrene beads.
Claim 16
Dependent Claim
144 words
A process for forming a channel sealant comprising (a) mixing 100 parts by weight of a diorganopolysiloxane of 50 to 200,000 centipoise viscosity at 25°C, where the organo groups are selected from monovalent hydrocarbon radicals and cyanoalkyl, 10 to 150 parts by weight of powdered polytetrafluoroethylene, 4 to 25 parts by weight of untreated silica, 0.3 to 2.0 parts by weight of a titanate of the formula, (RO).sub.4 Ti where R is selected from alkyl radicals and haloalkyl radicals of 2 to 5 carbon atoms and an aliphatic hydrocarbon compound containing at least one hydroxy group, (b) heating the resulting mixture to 100° to 200°C from 1 to 10 hours under a nitrogen atmosphere while continuing the agitation of the mixture, (c) cooling the mixture to room temperature, and (d) mixing into resulting composition from 10 to 50 parts by weight of styrene beads.
Claim 17
Dependent Claim
51 words
The process of claim 14 wherein prior to step (b) there is added from 0.5 to 10 parts by weight of a high temperature stabilizing boron additive selected from the class consisting of boric acid, trimethoxy boroxime and trialkyl borate where the alkyl groups contain from 1 to 5 carbon atoms.
Claim 18
Dependent Claim
79 words
The process of claim 15 wherein in step (b) there is mixed into the other ingredients from 0.1 to 5 parts by weight of a stabilizing additive which is alkyl silicate of the formula, R.sup.1 Si (OR.sup.2).sub.3 where R 1 is selected from the class consisting of alkyl and alkoxy radicals of 1 to 8 carbon atoms and R 2 is selected from the class consisting of alkyl, aryl, haloalkyl, and alkenyl radicals of 1 to 8 carbon atoms.
Claim 19
Dependent Claim
60 words
The process of claim 16 wherein in step (b) there is added from 5 to 40 parts by weight of a diorganopolysiloxane having a viscosity of 1,000,000 to 200,000,000 centipoise at 25°C, where the organo groups are selected from alkyl of 1 to 5 carbon atoms and cyanoalkyl of 2 to 5 carbon atoms wherein the polymer is dimethylvinyl end-stopped.
Claim 20
Dependent Claim
22 words
The process of claim 17 wherein in step (b) there is added from 100 to 10,000 parts per million of a peroxide.
Claim 21
Dependent Claim
96 words
The process of claim 18 wherein in step (d) there is added to the ingredients from 0.1 to 2 parts by weight of a polyether stabilizer of the formula, R.sup.3 O (C.sub.a H.sub.2a O).sub.x (C.sub.b H.sub.2b O).sub.y H where R 3 is a member selected from the class consisting of hydrogen and lower alkyl radicals of 1 to 7 carbon atoms, a and b are integers equal to from 1 to 4, inclusive, x is an integer equal to from about 4 to 50, inclusive, and y is an integer equal to from 0 to 50.
Claim 22
Dependent Claim
62 words
The process of claim 19 wherein in step (d) there is added from 0.1 to 5 parts by weight of a corrosion resistant additive selected from the class consisting of iron oxide, and zinc salts of C 2 O 2 , C 2 O 4 , C 2 O 6 , C 2 O 3 , and C 2 O 7 .
Claim 23
Dependent Claim
59 words
The process of claim 14 wherein the diorganopolysiloxane can be blends of diorganopolysiloxanes such that the final polymer blend has a viscosity of 50 to 200,000 centipoise at 25°C, and the polymer or polymers have the formula, R.sub.n.sup.4 SiO.sub.(4-n)/2 where R 4 is selected from the class consisting of methyl and cyanoethyl, and n varies from 2.001 to 2.05.
Claim 24
Dependent Claim
58 words
The process of claim 14 wherein the silica filler is selected from silica aerogel, fumed silica and precipitated silica and the treated silica is treated prior to incorporation in the composition with cyclicpolysiloxanes of the formula, (R.sup.5 SiO).sub.z where R 5 is an alkyl radical of 1 to 8 carbon atoms and z varies from 3 to 10.
Claim 25
Dependent Claim
33 words
The process of claim 14 wherein the aliphatic hydrocarbon compound containing at least one hydroxy group is selected from the class consisting of aliphatic diols and triols of 5 to 12 carbon atoms.
Claim 26
Dependent Claim
65 words
The process of claim 14 wherein the styrene beads are styrene beads where 10 to 40% by weight of said total beads have a mesh size of 1 to 50, 10 to 40% by weight of the total beads have a mesh size of 50 to 100 and 10 to 20% by weight of said total beads have a mesh size of 100 to 500.
Claim 27
Dependent Claim
11 words
The process of claim 18 wherein the peroxide is dicumyl peroxide.
Claim 28
Dependent Claim
26 words
The process of claim 23 wherein the titanium compound is tetraisopropyl titanate and the aliphatic hydrocarbon compound containing at least one hydroxy group is 2-ethyl, 1,3-hexanediol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |