US4347336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat cured silicone elastomer
Assignee: Dow Silicones Corp
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Filing: 1981-10-13
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Granted: 1982-08-31
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Expires: 2001-10-13
Abstract
Abstract A composition comprising a hydroxyl endblocked polydiorganosiloxane, methylvinylsilyl-bis-pyrrolidone, and organic peroxide will simultaneously chain extend and crosslink when heated. The composition can be prepared with a low viscosity polydiorganosiloxane to yield a low viscosity composition useful for coating, impregnating, and forming operations. Because the polymer chain extends as well as crosslinks during cure, the physical properties of the cured elastomer are superior to those of a low viscosity polymer which is merely crosslinked to an elastomer.
Inventors
- 👤 Gary R. Homan
- 👤 Charles A. Romig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:27
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/544; C08K5/5477; C08K5/04; C08K5/14; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/70; Y; Y10; Y10S; Y10S528/00; Y10S528/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
124 words
A composition comprising the product obtained by mixing, in the absence of moisture, (A) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane having a viscosity of from 0.07 to 50 Pa.s at 25° C. wherein each organic radical is selected from a group consisting of methyl, ethyl, vinyl, phenyl, and 3,3,3-trifluoropropyl radicals, there being from 0 to 2 inclusive percent vinyl radicals, from 0 to 50 inclusive percent 3,3,3-trifluoropropyl radicals, and from 0 to 30 percent inclusive phenyl radicals, all percents based on the total number of organic radicals in the polydiorganosiloxane; (B) sufficient ##STR18## to give from 0.9 to 1.1 moles of (B) for each two moles of hydroxyl radical in (A), and (C) 0.1 to 5 parts by weight of organic peroxide.
Claim 2
Dependent Claim
124 words
A composition comprising the product obtained by mixing, in the absence of moisture, (A) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane having a viscosity of from 0.07 to 50 Pa.s at 25° C. wherein each organic radical is selected from a group consisting of methyl, ethyl, vinyl, phenyl, and 3,3,3-trifluoropropyl radicals, there being from 0 to 2 inclusive percent vinyl radicals, from 0 to 50 inclusive percent 3,3,3-trifluoropropyl radicals, and from 0 to 30 percent inclusive phenyl radicals, all percents based on the total number of organic radicals in the polydiorganosiloxane; (B) sufficient ##STR18## to give from 0.9 to 1.1 moles of (B) for each two moles of hydroxyl radical in (A), and (C) 0.1 to 5 parts by weight of organic peroxide.
Claim 3
Dependent Claim
22 words
The composition in accordance with claim 1 in which there is also present from 1 to 200 parts by weight of filler.
Claim 4
Dependent Claim
22 words
The composition of claim 2 in which the filler is present in an amount of from 10 to 125 parts by weight.
Claim 5
Dependent Claim
23 words
The composition in accordance with claim 1 in which the polydiorganosiloxane has a viscosity at 25° C. of from 1.0 to 15 Pa.s.
Claim 6
Dependent Claim
169 words
A process consisting essentially of (1) mixing, in the absence of moisture, a composition comprising the product obtained by mixing (A) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane having a viscosity of from 0.07 to 50 Pa.s at 25° C. wherein each organic radical is selected from a group consisting of methyl, ethyl, vinyl, phenyl, and 3,3,3-trifluoropropyl radicals, there being from 0 to 2 inclusive percent vinyl radicals, from 0 to 50 inclusive percent 3,3,3-trifluoropropyl radicals, and from 0 to 30 inclusive percent phenyl radicals, all percents based on the total number of organic radicals in the polydiorganosiloxane; (B) sufficient ##STR19## to give from 0.9 to 1.1 moles of (B) for each 2 moles of hydroxyl radical in (A), and (C) 0.1 to 5 parts by weight of organic peroxide, to yield a composition, (2) forming the composition into a shape in a location, (3) heating the composition to a temperature above the activation temperature of the organic peroxide for a time sufficient to yield a cured elastomer.
Claim 7
Dependent Claim
169 words
A process consisting essentially of (1) mixing, in the absence of moisture, a composition comprising the product obtained by mixing (A) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane having a viscosity of from 0.07 to 50 Pa.s at 25° C. wherein each organic radical is selected from a group consisting of methyl, ethyl, vinyl, phenyl, and 3,3,3-trifluoropropyl radicals, there being from 0 to 2 inclusive percent vinyl radicals, from 0 to 50 inclusive percent 3,3,3-trifluoropropyl radicals, and from 0 to 30 inclusive percent phenyl radicals, all percents based on the total number of organic radicals in the polydiorganosiloxane; (B) sufficient ##STR19## to give from 0.9 to 1.1 moles of (B) for each 2 moles of hydroxyl radical in (A), and (C) 0.1 to 5 parts by weight of organic peroxide, to yield a composition, (2) forming the composition into a shape in a location, (3) heating the composition to a temperature above the activation temperature of the organic peroxide for a time sufficient to yield a cured elastomer.
Claim 8
Dependent Claim
20 words
The process in accordance with claim 5 in which the composition also contains from 1 to 200 parts of filler.
Claim 9
Dependent Claim
24 words
The process in accordance with claim 5 in which the filler is present in an amount of from 10 to 125 parts by weight.
Claim 10
Dependent Claim
23 words
The process in accordance with claim 5 in which the polydiorganosiloxane has a viscosity at 25° C. of from 1.0 to 15 Pa.s.
Claim 11
Dependent Claim
6 words
The cured elastomer of claim 5.
Claim 12
Dependent Claim
6 words
The cured elastomer of claim 6.
Claim 13
Dependent Claim
6 words
The cured elastomer of claim 7.
Claim 14
Dependent Claim
6 words
The cured elastomer of claim 8.
References Cited (Backward Citations)
US2876234A
Cited
US3364160A
Cited
US3378520A
Cited
US3417047A
Cited
US4020044A
Cited
US4012375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |