US4612383A
Expired / Lapsed
US
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Method of producing polysilazanes
Assignee: SRI International Inc
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Filing: 1985-04-26
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Granted: 1986-09-16
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Expires: 2005-04-26
Abstract
Abstract Method of producing polysilazanes from precursors having Si-H, Si-N or Si-Si bonds in the presence of a catalyst effective to activate such bonds. The catalyst may be a metal complex, e.g. a carbonyl cluster, which is soluble in an organic solvent and is homogeneous or it may be a heterogeneous catalyst. Higher polymers, and/or less crosslinking and oligomer formation, and/or greater control over the product and/or faster reactions and/or greater yields result. The polymers are soluble in common organic solvents and/or are solids which can be shaped. The products can be pyrolyzed to silicon nitride or used without pyrolysis.
Inventors
- 👤 Richard M. Laine
- 👤 Yigal Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/185; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B41/00; C04B41/45; C04B41/4505; C04B41/455; C04B41/4554; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C07F7/21; C08G77/382; C08G77/398; C08G77/48; C08G77/54; C08G77/60; C08G77/62; C08G79/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A method of preparing polysilazanes having the repeating structure I ##STR10## which comprises: (a) providing a starting material having the structure II in its molecule ##STR11## in which A is hydrogen, N< or ##STR12## structure II being part of a linear structure or part of a cyclic structure (b) providing a catalyst which is effective to activate Si--H, Si--N and/or Si--Si bonds, and (c) reacting the starting material in the presence of such catalyst with (1) hydrogen where A is nitrogen and structure II is part of a cyclic silazane or (2) with H--X--H in other cases, X being selected from the group >NH, --NR, --NH--NH--, ##STR13## R being hydrogen or an organic group or a silyl group and R 2 being a bivalent organic group (d) thereby forming a polymer having the repeating unit --Si--N--.
Claim 2
Independent Claim
136 words
A method of preparing polysilazanes having the repeating structure I ##STR10## which comprises: (a) providing a starting material having the structure II in its molecule ##STR11## in which A is hydrogen, N< or ##STR12## structure II being part of a linear structure or part of a cyclic structure (b) providing a catalyst which is effective to activate Si--H, Si--N and/or Si--Si bonds, and (c) reacting the starting material in the presence of such catalyst with (1) hydrogen where A is nitrogen and structure II is part of a cyclic silazane or (2) with H--X--H in other cases, X being selected from the group >NH, --NR, --NH--NH--, ##STR13## R being hydrogen or an organic group or a silyl group and R 2 being a bivalent organic group (d) thereby forming a polymer having the repeating unit --Si--N--.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein R is hydrogen or a hydrocarbon group.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the catalyst is a homogeneous catalyst.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the catalyst is a metal complex.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein the catalyst is a metal carbonyl cluster.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the catalyst is a heterogeneous catalyst.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein the reaction is carried out in an organic solvent at a temperature of about 60° to 150° C.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein the starting material is a cyclic silazane and it is reacted with hydrogen.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the starting material is a linear silazane and it is reacted with H--X--H.
Claim 11
Dependent Claim
9 words
The method of claim 9 wherein H--X--H is ammonia.
Claim 12
Dependent Claim
11 words
The method of claim 9 wherein H--X--H is a primary amine.
Claim 13
Dependent Claim
13 words
The method of claim 9 wherein H--X--H is hydrazine or a substituted hydrazine.
Claim 14
Dependent Claim
26 words
The method of claim 1 wherein the starting material is a cyclic compound containing an Si--Si bond in the ring and it is reacted with H--X--H.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |