US4724167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated silica fillers and process for making the same
Assignee: General Electric Co
•
Filing: 1986-05-30
•
Granted: 1988-02-09
•
Expires: 2006-05-30
Abstract
Abstract A treatment for finely divided silica reinforcing fillers is provided which utilizes low temperature and hydroxy or alkoxy containing diorganopolysiloxane as the treating agent. The treatment of fillers in this manner facilitates the manufacture and incorporation into silicone rubbers.
Inventors
- 👤 Edwin R. Evans
- 👤 Lawrence G. Waters
- 👤 Michael J. Rosko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:25
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C01; C01P; C01P2006/00; C01P2006/11; C01P2006/12; C01P2006/90; Y; Y10; Y10S; Y10S528/00; Y10S528/901; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
A process for treating finely divided silica reinforcing fillers comprising contacting said filler at a temperature of at most about 210° C. for a sufficient time to complete the reaction with from about 5 to about 50 parts by weight condensable diorganopolysiloxane which is in the liquid phase for each 100 parts by weight said silica reinforcing fillers, said condensable diorganopolysiloxane comprising compounds of the general formula: ##STR2## wherein X has a value of from about 1 to about 20 and R is a monovalent substituted or unsubstituted hydrocarbon radical.
Claim 2
Dependent Claim
90 words
A process for treating finely divided silica reinforcing fillers comprising contacting said filler at a temperature of at most about 210° C. for a sufficient time to complete the reaction with from about 5 to about 50 parts by weight condensable diorganopolysiloxane which is in the liquid phase for each 100 parts by weight said silica reinforcing fillers, said condensable diorganopolysiloxane comprising compounds of the general formula: ##STR2## wherein X has a value of from about 1 to about 20 and R is a monovalent substituted or unsubstituted hydrocarbon radical.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein from about 17 to about 30 parts by weight condensable diorganopolysiloxane is contacted with each 100 parts by weight filler.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein X has a value of from about 3 to about 10.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein R is at least about 50% by number methyl with the balance selected from the group consisting of alkyl, alkenyl, aryl, cycloalkyl, and halogenated derivatives thereof.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said filler is fumed silica.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said time is from about 1 to about 3 hours.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said condensable diorganopolysiloxane has halogenated organic substitution.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein said condensable diorganopolysiloxane is mixed with a non-condensable diluent.
Claim 10
Dependent Claim
12 words
The process of claim 8 wherein said non-condensable diluent is a diorganopolysiloxane.
Claim 11
Dependent Claim
25 words
The process of claim 9 wherein said diorganopolysiloxane is selected from the group consisting of vinyl end-stopped organopolysiloxane gum, silanol end-stopped organopolysiloxane gum and cyclodiorganopolysiloxane.
Claim 12
Dependent Claim
22 words
The process of claim 8 wherein the weight ratio of condensable diorganopolysiloxane to non-condensable diluent ranges from about 1/100 to about 9/1.
Claim 13
Dependent Claim
12 words
The process of claim 7 wherein said halogenated organic substitution is perfluoroalkyl.
References Cited (Backward Citations)
US4529774A
Cited
US4454288A
Cited
US4433096A
Cited
US4448927A
Cited
US4585821A
Cited
US4567231A
Cited
US4584341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |