US5086126A
Expired / Lapsed
US
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Method for producing functional silazane polymers
Assignee: Dow Silicones Corp
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Filing: 1990-12-24
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Granted: 1992-02-04
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Expires: 2010-12-24
Abstract
Abstract The present invention relates to a method of producing silazane polymers with silicon functional groups attached to the nitrogen. The method comprises treating a silazane polymer containing an N-H bond with an alkyllithium and then reacting the resultant silazane polymer with a chlorosilane. The invention also relates to novel silazane polymers produced by the above process as well as the use of these polymers to form ceramic materials.
Inventors
- 👤 Louis G. Mahone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C08G77/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
A method of adding silicon functional groups on a silazane polymer containing N-H bonds comprising: treating the silazane polymer containing the N-H bonds with an alkyllithium to form a silazane polymer containing LiN bonds; and reacting the silazane polymer containing Li-N bonds with a chlorosilane to form a silazane polymer with silicon functional groups.
Claim 2
Independent Claim
54 words
A method of adding silicon functional groups on a silazane polymer containing N-H bonds comprising: treating the silazane polymer containing the N-H bonds with an alkyllithium to form a silazane polymer containing LiN bonds; and reacting the silazane polymer containing Li-N bonds with a chlorosilane to form a silazane polymer with silicon functional groups.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein the alkyllithium is butyllithium.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein the treating and reacting are performed in a solvent.
Claim 5
Dependent Claim
11 words
The method of claim 3 wherein the solvent is an ether.
Claim 6
Dependent Claim
10 words
The method of claim 4 wherein the ether is tetrahydrofuran.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the silazane polymer is selected from the group consisting of hydridopolysilazane and methylpolydisilylazane.
Claim 8
Dependent Claim
19 words
The method of claim 5 wherein the silazane polymer is selected from the group consisting of hydridopolysilazane and methylpolydisilylazane.
Claim 9
Dependent Claim
40 words
The method of claim 1 wherein the chlorosilane has the formula R a SiCl b in which each R is independently hydrogen or a hydrocarbon group, a is 2 or 3, b is 1 or 2 and a+b equals 4.
Claim 10
Dependent Claim
29 words
The method of claim 8 wherein at least one of the R groups is a hydrocarbon group of the formula --(CH 2 ) x CHCH 2 , wherein x=0-32.
Claim 11
Dependent Claim
40 words
The method of claim 7 wherein the chlorosilane has the formula R a SiCl b in which each R is independently hydrogen or a hydrocarbon group, a is 2 or 3, b is 1 or 2 and a+b equals 4.
Claim 12
Dependent Claim
29 words
The method of claim 10 wherein at least one of the R groups is a hydrocarbon group of the formula --(CH 2 ) x CHCH 2 , wherein x=0-32.
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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |