US3868345A
Expired / Lapsed
US
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Elastomers made from hardenable masses based on diorganopolysiloxanes
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1973-03-08
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Granted: 1975-02-25
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Expires: 1993-03-08
Abstract
Abstract Elastomers made from masses hardenable at room or slightly higher temperature, based on diorganopolysiloxanes and containing reinforcing fillers of SiO2 of finest particle size reacted with silicon compounds, said reaction being carried out under mechanical impact to increase the bulk weight of the resulting SiO2 to 150-320 grams per liter, which treatment may, in some cases, be followed by treatment to decrease the bulkweight of the SiO2 to 20-85 grams/liter. The elastomers have unusual strength properties against continued tearing, breaking, elongation, and tensile strength.
Inventors
- 👤 Gunter Kratel
- 👤 Gunter Stohr
- 👤 Georg Vogt
- 👤 Wolfgang Hechtl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:11
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/12; C08; C08K; C08K5/00; C08K5/54; C08K9/00; C08K9/04; C08K9/06; C08L; C08L83/00; C08L83/04; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C08G; C08G77/00; C08G77/04; C08G77/045; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/24; C08G77/26; C08G77/28; C08G77/30; C08G77/42; C08G77/442; C08G77/445; C08G77/452; C08G77/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
IN ELASTOMERS MADE FROM MASSES HARDNABLE AT ROOM TEMPERATURE OR SLIGHTLY HIGHER TEMPERATURES, SAID MASSES BEING BASED ON DIORGANOPOLYSILOXANES AND CONTAINING REINFORCING FILLERS OF SIO2 HAVING A SURFACE AREA OF AT LEAST 50 M2/G REACTED WITH ORGANOSILICON COMPOUNDS IN AMOUNTS OF 3-25 PERCENT BY WEIGHT, THE IMPROVEMENT THAT THE ORGANOSILICON COMPOUNDS USED HAVE THE GENERAL FORMULA
Claim 2
Dependent Claim
56 words
IN ELASTOMERS MADE FROM MASSES HARDNABLE AT ROOM TEMPERATURE OR SLIGHTLY HIGHER TEMPERATURES, SAID MASSES BEING BASED ON DIORGANOPOLYSILOXANES AND CONTAINING REINFORCING FILLERS OF SIO2 HAVING A SURFACE AREA OF AT LEAST 50 M2/G REACTED WITH ORGANOSILICON COMPOUNDS IN AMOUNTS OF 3-25 PERCENT BY WEIGHT, THE IMPROVEMENT THAT THE ORGANOSILICON COMPOUNDS USED HAVE THE GENERAL FORMULA
Claim 3
Dependent Claim
27 words
Elastomers as defined in claim 1, wherein the treatment for increasing the bulk weight of SiO2 is carried out before the SiO2 is reacted with organosilicon compounds.
Claim 4
Dependent Claim
31 words
Elastomers as defined in claim 1, wherein the fillers of SiO2 reacted with organosilicon compounds are added in the amount of at least 5 percent by weight of the hardenable masses.
Claim 5
Dependent Claim
31 words
Elastomers as defined in claim 1, wherein in the reaction of the organosilicon compounds with the SiO2, 0.3 - 3 percent water are present calculated on the weight of the SiO2.
Claim 6
Dependent Claim
25 words
Elastomers as defined in claim 1, wherein the impact to increase the bulk weight of the SiO2 is effected by comminuting and pressure exerting means.
Claim 7
Dependent Claim
19 words
Elastomers as defined in claim 5, wherein the impact effecting means is of the type of a ball mill.
Claim 8
Dependent Claim
74 words
MAsses for making elastomers as defined in claim 1, wherein the diorganopolysiloxanes used have the formula Zn Si (R)O3 n (Si (R2) O)x Si (R)3 n Zn wherein R stands for the same or different monovalent hydrocarbon radicals, Z is a member selected from the group consisting of hydroxyl, a hydrolysable group, a hydrolysable atom, and alkenyl, n is 1, 2 or 3 and x an integer having the value of at least one.
Claim 9
Dependent Claim
17 words
Masses as defined in claim 7, wherein at least the preponderant part of R are methyl groups.
Claim 10
Dependent Claim
18 words
The elastomers as defined in claim 1 wherein the organosilicon compound used for reaction with SiO2 is trimethylethoxysilane.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |