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US4104239A
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Organopolysiloxane compositions transformable into elastomers without use of vulcanizing agents
Assignee: Rhone Poulenc Industries SA
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Filing: 1977-03-04
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Granted: 1978-08-01
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Expires: 1997-03-04
Abstract
Abstract An organopolysiloxane composition is disclosed which is transformable into elastomers by heating without using any vulcanizing agent. These compositions comprise: [1] 100 parts by weight of at least one hydroxylated polydiorganosiloxane having a viscosity of between about 2·10 5 and about 80·10 6 cps at 25° C. and containing 0.001 to 0.1% by weight of terminal hydroxy groups per weight of the polysiloxane; [2] at least 10 parts by weight of silica having a special surface of between about 100 and about 400 m 2 /g; and [3] 0.5 to 15 parts by weight of at least one silane of the formula (I) ##STR1## wherein R 1 and R 2 are the same or different and represent methyl or ethyl.
Inventors
- 👤 Michel Bargain
- 👤 Robert Lagarde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:45
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K3/00; C08K3/34; C08K3/36; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A storage stable organopolysiloxane composition devoid of a curing agent which is heat curable into elastomers comprising: [1] 100 parts by weight of at least one hydroxylated polydiorganosiloxane having a viscosity of between about 2·10 5 and about 80·10 6 cps at 25° C. and containing about 0.001 to about 0.1% by weight of terminal hydroxy groups per weight of the polysiloxane; [2] at least 10 parts by weight of a silica having a specific surface of between about 100 and about 400 m 2 /g; and, [3] 0.5 to 15 parts by weight of at least one silane of the formula (I) ##STR5## wherein R 1 and R 2 are the same or different and represent methyl or ethyl.
Claim 2
Dependent Claim
120 words
A storage stable organopolysiloxane composition devoid of a curing agent which is heat curable into elastomers comprising: [1] 100 parts by weight of at least one hydroxylated polydiorganosiloxane having a viscosity of between about 2·10 5 and about 80·10 6 cps at 25° C. and containing about 0.001 to about 0.1% by weight of terminal hydroxy groups per weight of the polysiloxane; [2] at least 10 parts by weight of a silica having a specific surface of between about 100 and about 400 m 2 /g; and, [3] 0.5 to 15 parts by weight of at least one silane of the formula (I) ##STR5## wherein R 1 and R 2 are the same or different and represent methyl or ethyl.
Claim 3
Dependent Claim
20 words
The compositions as defined in claim 1, which comprises about 10 to about 200 parts by weight of the silica.
Claim 4
Dependent Claim
20 words
The composition as defined in claim 1, which comprises about 20 to about 100 parts by weight of the silica.
Claim 5
Dependent Claim
23 words
The composition as defined in claim 1, which comprises about 1 to about 6 parts by weight of the silane of formula (I).
Claim 6
Dependent Claim
36 words
The composition as defined in claim 1, wherein the silica comprises a mixture of untreated silica and silica which has been treated with an organosilicic compound selected from the group consisting of hexamethylcyclotetrasiloxane, octamethylcyclotetrasiloxane and hexamethyldisilazane.
Claim 7
Dependent Claim
27 words
A process for preparing organosilicone elastomers which comprises the step of heating the composition as defined in claim 1 to a temperature sufficient to vulcanize said composition.
Claim 8
Dependent Claim
24 words
The process as defined in claim 6, wherein the heating step is effected at a temperature of between about 50° and about 450° C.
Claim 9
Dependent Claim
18 words
The process as defined in claim 7, wherein the temperature is between about 80° and about 350° C.
Claim 10
Dependent Claim
17 words
The process as defined in claim 8, wherein the temperature is between about 150° and 250° C.
Claim 11
Dependent Claim
14 words
The process as defined in claim 6, which further comprises a second heating step.
Claim 12
Dependent Claim
25 words
The process as defined in claim 10, wherein the second heating step is effected at a temperature of between about 150° and about 250° C.
Claim 13
Dependent Claim
12 words
An organopolysiloxane elastomer obtained by the process as defined in claim 6.
Claim 14
Dependent Claim
11 words
A shaped article comprising the elastomer as defined in claim 12.
Claim 15
Dependent Claim
113 words
A composition as defined in claim 1, essentially consisting of: [1] 100 parts by weight of at least one hydroxylated polydiorganosiloxane having a viscosity of between about 2·10 5 and about 80·10 6 cps at 25° C. and containing about 0.001 to about 0.1% by weight of terminal hydroxy groups per weight of the polysiloxane; [2] at least 10 parts by weight of a silica having a specific surface of between about 100 and about 400 m 2 /g; and [3] 0.5 to 15 parts by weight of at least one silane of the formula (I) ##STR6## wherein R 1 and R 2 are the same or different and represent methyl or ethyl.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |