US3839246A
Expired / Lapsed
US
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Two-part room temperature vulcanizable systems
Assignee: General Electric Co
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Filing: 1973-08-09
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Granted: 1974-10-01
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Expires: 1993-08-09
Abstract
Abstract There is provided by the present invention a two-part room temperature vulcanizable silicone rubber composition which is exceptionally stable to reversion and specifically to reversion of the cured composition caused by water comprising a silanolstopped diorganopolysiloxane, filler, an alkyl silicate and a catalyst where the catalyst is a reaction product of an organic tin oxide compound with the hydrocarbon ester of an oxygencontaining acid having at least one oxygen atom in the acid radical attached to a replaceable acid hydrogen atom. The hydrocarbon ester can be either an inorganic acid or a carboxylic acid. The preferred catalyst in the present invention is the reaction product of dibutyl tin oxide and a phthalate ester.
Inventors
- 👤 S Hamilton
- 👤 W Lampe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/56; C08K5/57; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
77 words
A TWO-PART ROOM TEMPERATURE VULCANIZABLE SILICONE RUBBER COMPOSITION WITH IMPROVED HYDROLYTIC RESISTANCE COMPRISING, A. A LINEAR, FLUID ORGANOPOLYSILOXANE CONTAINING TERMINAL SILICON-BONDED HYDROXY GROUPS AND HAVING A VISCOSITY OF 500 TO 10,000.000 CENTIPOISE WHEN MEASURED AT 25*C, THE ORGANIC GROUPS OF THE AFORESAID ORGANOPOLYSILOXANE REPRESENTING MONOVALENT HYDROCARBON RADICALS, B. A FILLER, C. FROM 0.1 - 15 PERCENT BY WEIGHT OF AN ALKYL SILICATE SELECTED FROM THE CLASS CONSISTING OF (1) A MONOMERIC ORGANOSILICATE CORRESPONDING TO THE GENERAL FORMULA,
Claim 2
Dependent Claim
77 words
A TWO-PART ROOM TEMPERATURE VULCANIZABLE SILICONE RUBBER COMPOSITION WITH IMPROVED HYDROLYTIC RESISTANCE COMPRISING, A. A LINEAR, FLUID ORGANOPOLYSILOXANE CONTAINING TERMINAL SILICON-BONDED HYDROXY GROUPS AND HAVING A VISCOSITY OF 500 TO 10,000.000 CENTIPOISE WHEN MEASURED AT 25*C, THE ORGANIC GROUPS OF THE AFORESAID ORGANOPOLYSILOXANE REPRESENTING MONOVALENT HYDROCARBON RADICALS, B. A FILLER, C. FROM 0.1 - 15 PERCENT BY WEIGHT OF AN ALKYL SILICATE SELECTED FROM THE CLASS CONSISTING OF (1) A MONOMERIC ORGANOSILICATE CORRESPONDING TO THE GENERAL FORMULA,
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein in said catalyst R'''' and R'''''' are selected from alkyl and aryl radicals of up to 18 carbon atoms.
Claim 4
Dependent Claim
17 words
The composition of claim 2 wherein in said catalyst said hydrocarbon ester is of the inorganic acid.
Claim 5
Dependent Claim
21 words
The composition of claim 2 wherein in said catalyst said hydrocarbon ester is of the monocarboxylic acid or the dicarboxylic acid.
Claim 6
Dependent Claim
24 words
The composition of claim 1 which is self-bonding by having therein 0.1 to 10 percent by weight of a nitrogen-functional silane of the formula,
Claim 7
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 8
Dependent Claim
17 words
The composition of claim 5 wherein the organopolysiloxane of (a) is a diorganopolysiloxane which has the formula,
Claim 9
Dependent Claim
28 words
The composition of claim 1 wherein the alkyl silicate is polyethyl silicate and is present in an amount of 0.1 to 10 percent by weight of the organopolysiloxane.
Claim 10
Dependent Claim
23 words
The composition of claim 5 wherein said catalyst is used at a concentration of 0.1 to 3.0 percent by weight of the organopolysiloxane.
Claim 11
Dependent Claim
24 words
The composition of claim 1 wherein there is utilized 5 to 300 percent by weight of filler based on the weight of the organopolysiloxane.
Claim 12
Dependent Claim
62 words
The composition of claim 10 wherein the filler is highly reinforcing filler and semi-reinforcing filler selected from the class consisting of titanium dioxide, lithopone, zinc oxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, calcium carbonate, fumed silica, precipitated silica, glass fibers, magnesium oxide, chromic oxide, zirconium oxide, aluminum oxide, crushed quartz, calcined clay, asbestos, carbon, graphite, cork, cotton and synthetic fibers.
Claim 13
Dependent Claim
86 words
The composition of claim 1 which further includes therein a low molecular weight organopolysiloxane fluid which is composed of (R42)2SiO units, (R42)3SiO1/2 units and R42SiO3/2 units having 0.05 percent to 8 percent by weight of hydroxy radicals, where the ratio of the organosiloxy units to the diorganosiloxy units is from 0.11 to 1.4, inclusive, and the ratio of the triorganosiloxy units to diorganosiloxy units is from 0.02 to about 1, such that said fluid may be linear or branched chain where R42 is an alkyl radical.
Claim 14
Dependent Claim
30 words
The composition of claim 5 wherein the nitrogen-functional silane is present at a concentration of 0.1 to 5 percent by weight of the linear organopolysiloxane having terminal silanol groups thereon.
Claim 15
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 16
Dependent Claim
11 words
The composition of claim 14 wherein the silane has the formula,
Claim 17
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 18
Dependent Claim
13 words
The composition of claim 5, wherein the nitrogen-functional containing silane has the formula,
Claim 19
Dependent Claim
12 words
The composition of claim 17 wherein the nitrogen-functional silane has the formula,
Claim 20
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 21
Dependent Claim
13 words
The composition of claim 19 wherein the nitrogen-functional silane is of the formula,
Claim 22
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 23
Dependent Claim
14 words
The composition of claim 21 wherein the nitrogen-functional silane is of the formula, (CH3O)3SiCH2CH2CH2SCH2CH2NHCH2CH2NH2.
Claim 24
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 25
Dependent Claim
12 words
The composition of claim 23 wherein the nitrogen-functional silane has the formula,
Claim 26
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 27
Dependent Claim
13 words
The composition of claim 25 wherein the nitrogen-functional silane is of the formula,
Claim 28
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 29
Dependent Claim
12 words
The composition of claim 27 wherein the nitrogen-functional silane has the formula,
Claim 30
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 31
Dependent Claim
14 words
The composition of claim 29 wherein the nitrogen-functional silane is of the formula, (CH3CH2O)3SiCH2CH2CH2NH2.
Claim 32
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 33
Dependent Claim
13 words
The composition of claim 31 wherein the nitrogen-functional silane has the formula, (CH3O)3SiCH2CH2CH2OCH2-CH-CH2NH2.
Claim 34
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 35
Dependent Claim
15 words
The composition of claim 33 wherein the nitrogen-functional silane is of the formula, (CH3O)3SiCH CH-C(CH3)2O-CH2CH2CH2NH2.
Claim 36
Dependent Claim
13 words
The composition of claim 5 wherein the nitrogen-functional silane is of the formula,
Claim 37
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 38
Dependent Claim
13 words
The composition of claim 36 wherein the nitrogen-functional silane has the formula, (CH3O)3SiCH2CH2CH2-S-CH2CH2NH2.
Claim 39
Dependent Claim
12 words
The composition of claim 5 wherein the nitrogen-functional silane has the formula,
Claim 40
Dependent Claim
15 words
The composition of claim 38 wherein the nitrogen-functional silane is of the formula, (CH3O)3SiCH CH-C(CH3)2OCH2CH2CH2CH2NHCH2CH2CH2NH2.
Claim 41
Dependent Claim
43 words
The silicone rubber composition of claim 1 wherein there is further present 5 to 50 percent by weight of the total composition of an aromatic or aliphatic solvent selected from the group consisting of xylene, cyclohexane, toluene, mineral spirits, benzene, heptane and octane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |