US4528390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymethylsilsesquioxane
Assignee: Momentive Performance Materials Japan LLC
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Filing: 1984-06-21
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Granted: 1985-07-09
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Expires: 2004-06-21
Abstract
Abstract A process for preparing polymethylsilsesquioxane comprising hydrolyzing and condensing methyltrialkoxysilane or its partially hydrolyzed condensate in an aqueous solution of ammonia or an amine.
Inventors
- 👤 Hiroshi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:16
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874; C08K; C08K5/00; C08K5/54; C08K5/549
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A process for preparing polymethylsilsesquioxane comprising hydrolyzing and condensing methyltrialkoxysilane or its partially hydrolyzed condensate in an aqueous solution of ammonia or an amine.
Claim 2
Dependent Claim
24 words
A process for preparing polymethylsilsesquioxane comprising hydrolyzing and condensing methyltrialkoxysilane or its partially hydrolyzed condensate in an aqueous solution of ammonia or an amine.
Claim 3
Dependent Claim
13 words
A process as set forth in claim 1 wherein the methyltrialkoxysilane is methyltrimethoxysilane.
Claim 4
Dependent Claim
22 words
A process as set forth in claim 1 wherein the aqueous solution of ammonia or an amine is an aqueous ammonia solution.
Claim 5
Dependent Claim
18 words
A process as set forth in claim 1 further comprising heating the solution so as to accelerate condensation.
References Cited (Backward Citations)
US3637560A
Cited
US4399266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |