US4013611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing elastomers
Assignee: Wacker Chemie AG
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Filing: 1975-06-23
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Granted: 1977-03-22
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Expires: 1995-06-23
Abstract
Abstract An improved process for preparing compositions capable of being converted into elastomers containing (A) triorganosiloxy-terminated diorganopolysiloxanes having at least one vinyl group in each terminal unit, (B) triorganosiloxy-terminated organopolysiloxanes containing organohydrogensiloxane units and diorganosiloxane units, (C) fillers which are hydrophobic or are capable of being rendered hydrophobic and having a surface area of at least 50 m 2 /g and (D) catalysts which promote the addition of SiH groups to vinyl groups which comprises mixing organopolysiloxanes (B) containing organohydrogensiloxane (SiH) units with at least 75 percent by weight of the fillers (C) having a surface area of at least 50 m 2 /g before mixing with the organopolysiloxanes (A) having triorganosiloxy-terminal units with at least one vinyl group in each terminal unit.
Inventors
- 👤 Wolfgang Hechtl
- 👤 Ernst Wohlfarth
- 👤 Alois Strasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:54
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/18; C08K3/20; C08K5/00; C08K5/54; C08K9/00; C08K9/04; C08K9/06; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/42; C08G77/44; C08G77/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
170 words
An improved process for preparing compositions capable of being converted into elastomers comprising (A) triorganosiloxy-terminated diorganopolysiloxanes having at least one vinyl group in each terminal unit and a viscosity of from 10 to 5000 cP at 25° C., (B) organopolysiloxanes having from 2000 to 50,000 cP at 25° C., said organopolysiloxanes (B) containing organohydrogensiloxane units of the formula RHSiO, diorganosiloxane units of the formula R 2 SiO and triorganosiloxy terminal units of the formula R 3 SiO 1/2 , in which R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, (C) fillers capable of being rendered hydrophobic and having a surface area of at least 50 m 2 /g and (D) catalysts which promote the addition of SiH groups to vinyl groups, the improvement which comprises mixing the organopolysiloxanes (B) with at least 75 percent by weight of fillers (C) having a surface area of at least 50 m 2 /g prior to mixing the above mixture with organopolysiloxanes (A) and catalysts (D).
Claim 2
Dependent Claim
170 words
An improved process for preparing compositions capable of being converted into elastomers comprising (A) triorganosiloxy-terminated diorganopolysiloxanes having at least one vinyl group in each terminal unit and a viscosity of from 10 to 5000 cP at 25° C., (B) organopolysiloxanes having from 2000 to 50,000 cP at 25° C., said organopolysiloxanes (B) containing organohydrogensiloxane units of the formula RHSiO, diorganosiloxane units of the formula R 2 SiO and triorganosiloxy terminal units of the formula R 3 SiO 1/2 , in which R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, (C) fillers capable of being rendered hydrophobic and having a surface area of at least 50 m 2 /g and (D) catalysts which promote the addition of SiH groups to vinyl groups, the improvement which comprises mixing the organopolysiloxanes (B) with at least 75 percent by weight of fillers (C) having a surface area of at least 50 m 2 /g prior to mixing the above mixture with organopolysiloxanes (A) and catalysts (D).
Claim 3
Dependent Claim
84 words
The process of claim 1 wherein the fillers (C) are mixed with organopolysiloxane (B) and diorganopolysiloxanes (E) having on the average for each molecule terminal units selected from the class consisting of a CH 2 =CHR 2 SiO 1/2 unit and a diorganohydrogensiloxane unit of the formula R 2 HSiO 1/2 , in which one diorganohydrogensiloxane unit is present for each CH 2 =CHR 2 SiO 1/2 unit or two diorganohydrogensiloxane units prior to mixing the above mixture with organopolysiloxanes (A) and catalysts (D).
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the diorganopolysiloxanes (E) have a viscosity of from 300 to 5000 cP at 25° C.
Claim 5
Dependent Claim
30 words
The process of claim 2 wherein the diorganopolysiloxanes (E) are used in an amount of from 50 to 400 percent by weight based on the weight of the organopolysiloxanes (B).
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the filler (C) is treated with an organosilicon compound and rendered hydrophobic prior to mixing with the organopolysiloxanes (B).
Claim 7
Dependent Claim
27 words
The process of claim 2 wherein the filler (C) is treated with an organosilicon compound and rendered hydrophobic prior to mixing with organopolysiloxanes (B) and organopolysiloxanes (E).
Claim 8
Dependent Claim
51 words
The process of claim 1 wherein the organopolysiloxanes (B) are mixed with at least 75 percent by weight of fillers (C) having a surface area of at least 50 m 2 /g and a sufficient amount of organosilicon compound to render the fillers (C) hydrophobic while being mixed with organopolysiloxanes (B).
Claim 9
Dependent Claim
38 words
The process of claim 7 wherein the fillers (C) are mixed with organopolysiloxanes (B), diorganopolysiloxanes (E) and a sufficient amount of organosilicon compounds to render the fillers (C) hydrophobic while being mixed with organopolysiloxanes (B) and diorganopolysiloxanes (E).
Claim 10
Dependent Claim
31 words
The process of claim 5 where the amount of organosilicon compound is present in an amount of from 2 to 25 percent by weight based on the weight of the fillers.
Claim 11
Dependent Claim
29 words
The process of claim 7 wherein the organosilicon compound is present in an amount of from 3 to 40 percent by weight based on the weight of the fillers.
Claim 12
Dependent Claim
84 words
The process of claim 2 wherein the fillers (C) are mixed with the diorganopolysiloxanes (E) having on the average for each molecule terminal units selected from the class consisting of a CH 2 =CHR 2 SiO 1/2 unit and a diorganohydrogensiloxane unit of the formula R 2 HSiO 1/2 , in which one diorganohydrogensiloxane unit is present for each CH 2 =CHR 2 SiO 1/2 unit or two diorganohydrogensiloxane units prior to mixing the above mixture with organopolysiloxanes (A) and (B) and catalysts (D).
Claim 13
Dependent Claim
25 words
The process of claim 2 wherein the filler (C) is treated with an organosilicon compound and rendered hydrophobic prior to mixing with the diorganopolysiloxanes (E).
Claim 14
Dependent Claim
33 words
The process of claim 2 wherein the diorganopolysiloxanes (E) are mixed with filler (C) and a sufficient amount of organosilicon compound to render the filler (C) hydrophobic while being mixed with organopolysiloxane (B).
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |