Patent US4317899A successfully refreshed from Google Patents.
US4317899A
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Process for producing fluorosilicone polymers
Assignee: General Electric Co
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Filing: 1980-07-18
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Granted: 1982-03-02
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Expires: 2000-07-18
Abstract
Abstract A process for producing a fluorosilicone polymer comprising reacting a fluoro-substituted cyclic polysiloxane with a polymerization catalyst and as the novel ingredient a low molecular weight silanol terminated diorganopolysiloxane polymer and then after the polymer is formed, neutralizing the catalyst. In another embodiment of the present invention, there can be utilized in the polymerization reaction a high molecular weight aliphatic alcohol in place of the low molecular weight silanol terminated diorganopolysiloxane polymer.
Inventors
- 👤 Ben A. Bluestein
- 👤 E. Robert Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:02
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A process for producing fluorosilicone polymers of a viscosity varying from 1,000,000 to 300,000,000 centipoise at 25° C. comprising the steps of: (1) reacting (a) a fluoro-substituted cyclopolysiloxane of the formula: (R R.sup.1 SiO).sub.t wherein R is selected from the class consisting of alkyl radicals and phenyl radicals and R 1 is a 3,3,3-trifluoropropyl radical, and t is the integer 3; with (b) a chainstopper of the formula: ##STR3## wherein R 2 is selected from the class consisting of alkyl and phenyl radicals, R 3 is a 3,3,3-trifluoropropyl radical, and s is a whole number which varies from 2 to 50; and (c) a basic polymerization catalyst; and (2) neutralizing said basic polymerization catalyst.
Claim 2
Dependent Claim
114 words
A process for producing fluorosilicone polymers of a viscosity varying from 1,000,000 to 300,000,000 centipoise at 25° C. comprising the steps of: (1) reacting (a) a fluoro-substituted cyclopolysiloxane of the formula: (R R.sup.1 SiO).sub.t wherein R is selected from the class consisting of alkyl radicals and phenyl radicals and R 1 is a 3,3,3-trifluoropropyl radical, and t is the integer 3; with (b) a chainstopper of the formula: ##STR3## wherein R 2 is selected from the class consisting of alkyl and phenyl radicals, R 3 is a 3,3,3-trifluoropropyl radical, and s is a whole number which varies from 2 to 50; and (c) a basic polymerization catalyst; and (2) neutralizing said basic polymerization catalyst.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said chainstopper is a mixture of polymers selected from those having a value of s varying from 2 through 8, inclusive.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the basic polymerization catalyst is an alkali metal hydroxide.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein in step (1) there is present at least 400 parts per million of chainstopper (b), and at least 10 parts per million of basic polymerization catalyst.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein step (1) is carried out at a temperature in the range of 120° to 180° C.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein step (1) is carried out for a time period varying from 5 minutes to 4 hours.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein in step (2) the basic polymerization catatlyst is neutralized with a silyl phosphate.
Claim 9
Dependent Claim
28 words
The process of claim 1 wherein after step (2) further comprising heating the mixture to at least 150° C. for at least 1 hour to strip off volatiles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |