US4324901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soluble polysilastyrene and method for preparation
Assignee: Wisconsin Alumni Research Foundation
•
Filing: 1981-04-29
•
Granted: 1982-04-13
•
Expires: 2001-04-29
Abstract
Abstract The preparation of soluble polysilastyrene comprising reacting phenylmethyldichlorosilane and dimethyldichlorosilane in the mole ratio of 1 to 0.25-2 in the solvent solution in the presence of sodium.
Inventors
- 👤 Robert C. West
- 👤 Lawrence D. David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:56
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
28 words
Process for making polysilastyrenes comprising reacting phenylmethyldichlorosilane and dimethyldichlorosilane in solvent solution in the presence of sodium in the ratio of 1 mole phenylmethyldichlorosilane to 0.25-2 moles dimethyldichlorosilane.
Claim 2
Dependent Claim
28 words
Process for making polysilastyrenes comprising reacting phenylmethyldichlorosilane and dimethyldichlorosilane in solvent solution in the presence of sodium in the ratio of 1 mole phenylmethyldichlorosilane to 0.25-2 moles dimethyldichlorosilane.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1 in which the monomers are reacted in about equal molecular proportions.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 1 in which the reaction is carried out at a temperature above the melting point temperature of the sodium.
Claim 5
Dependent Claim
23 words
The process as claimed in claim 1 in which the reaction is carried out at a temperature within the range of 100°-150° C.
Claim 6
Dependent Claim
34 words
The process as claimed in claim 1 in which the solvent is a non-acidic solvent having a boiling point of at least 100° C. and is inert to the sodium and to the chlorosilanes.
Claim 7
Dependent Claim
17 words
The process as claimed in claim 1 in which the reaction is carried out at reflux temperature.
Claim 8
Dependent Claim
23 words
The process as claimed in claim 1 in which the sodium is employed at a slight excess of up to 20 mole percent.
Claim 9
Dependent Claim
21 words
The process as claimed in claim 1 which includes potassium in an amount up to 1% by weight of the sodium.
Claim 10
Dependent Claim
17 words
The process as claimed in claim 1 which includes the step of protecting the reaction from light.
Claim 11
Dependent Claim
18 words
The process as claimed in claim 1 in which the reaction is carried out in an inert atmosphere.
Claim 12
Dependent Claim
27 words
A polysilastyrene produced by the process of claim 1 having the general formula ##STR3## in which x equals 0.6-1.4 and n is a number up to 1200.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |