US4222952A
Expired / Lapsed
US
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Siloxane bond rearrangement effected by solid perfluorinated polymers containing pendant sulfonic acid groups
Assignee: OSI Specialties Inc
•
Filing: 1979-06-25
•
Granted: 1980-09-16
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Expires: 1999-06-25
Abstract
Abstract Organosiloxane equilibrations and other bond rearrangements are easily and rapidly accomplished through the utilization of catalysts comprised of solid perfluorinated polymers containing pendant sulfonic acid groups.
Inventors
- 👤 Steven C. Vick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
34 words
A process for siloxane bond rearrangement which comprises treating, at a temperature of from about 70° C. to about 180° C., an organosiloxane composition with a solid perfluorinated polymer containing pendant sulfonic acid groups.
Claim 2
Dependent Claim
34 words
A process for siloxane bond rearrangement which comprises treating, at a temperature of from about 70° C. to about 180° C., an organosiloxane composition with a solid perfluorinated polymer containing pendant sulfonic acid groups.
Claim 3
Dependent Claim
34 words
A process as in claim 1 which comprises treating, at a temperature of from about 120° C. to about 150° C., an organosiloxane composition with a solid perfluorinated polymer containing pendant sulfonic acid groups.
Claim 4
Dependent Claim
15 words
A process as in claim 1 wherein said organosiloxane composition is a mixture of organosiloxanes.
Claim 5
Dependent Claim
23 words
A process as in claim 3 wherein the viscosity at 25° C. of said organosiloxane composition mixture is up to about 10,000 centipoises.
Claim 6
Dependent Claim
13 words
A process as in claim 4 wherein the mixture comprises hexamethyldisiloxane and polydimethylsiloxane.
Claim 7
Dependent Claim
21 words
A process as in claim 5 wherein said mixture comprises a minor amount of hexamethyldisiloxane and a major amount of octamethylcyclotetrasiloxane.
Claim 8
Dependent Claim
26 words
A process as in claim 4 wherein the mixture comprises: methyl hydrogen siloxane; polydimethylsiloxane; and an organosiloxane selected from the group consisting of hexamethyldisiloxane and sym-tetramethyldisiloxane.
Claim 9
Dependent Claim
13 words
A process as in claim 1 wherein said siloxane bond rearrangement comprises depolymerization.
Claim 10
Dependent Claim
12 words
A process as in claim 1 wherein said organopolysiloxane composition is solvated.
Claim 11
Dependent Claim
50 words
A process as in claim 1 wherein the solid perfluorinated polymer containing pendant sulfonic acid groups is present in the form of a bead, a cube, a fiber, a flake, a granule, a membrane, a powder, a ring, a screen, or a tube, or is supported on an inert substrate.
Claim 12
Dependent Claim
28 words
A process as in claim 10 wherein the siloxane composition is flowed through and/or around one or more tubes comprising a solid perfluorinated polymer containing sulfonic acid groups.
Claim 13
Dependent Claim
15 words
A process as in claim 1 wherein the siloxane bond rearrangement is carried out batchwise.
Claim 14
Dependent Claim
20 words
A process as in claim 1 wherein the siloxane bond rearrangement is carried out in a continuously stirred tank reactor.
Claim 15
Dependent Claim
17 words
A process as in claim 1 wherein said organosiloxane composition is flowed through a fluidized catalyst bed.
Claim 16
Dependent Claim
18 words
A process as in claim 1 wherein said organosiloxane composition is flowed continuously through a stationary catalyst bed.
Claim 17
Dependent Claim
18 words
A process as in claim 15 wherein said organosiloxane composition is flowed continuously through a packed catalyst bed.
Claim 18
Dependent Claim
17 words
A process as in claim 1 wherein the product comprises a siloxane effluent in chemical bond equilibrium.
Claim 19
Dependent Claim
62 words
A process as in ay one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, or 17 in which said solid perfluorinated polymer containing pendant sulfonic acid groups is characterized by the formula ##STR5## wherein m is from 5 to 13.5, n is about 1000, and z is from 1 to about 3.
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |