US4835238A
Expired / Lapsed
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Polysilacyclobutasilazanes
Assignee: Dow Silicones Corp
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Filing: 1987-06-08
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Granted: 1989-05-30
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Expires: 2007-06-08
Abstract
Abstract The reaction of 1,1-dichlorosilacyclobutanes with nitrogen-containing difunctional nucleophiles gives polysilacyclobutasilazanes which can be crosslinked and also converted to ceramic materials.
Inventors
- 👤 Gary T. Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B35/56; C04B35/565; C04B35/571; C08; C08G; C08G77/00; C08G77/60; C08G77/62
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
106 words
A polysilacyclobutasilazane composition prepared by a process comprising: (I) contacting and reacting in an inert, essentially anhydrous atmosphere, 1,1-dichloro-1-silacyclobutane having the general formula R.sub.2 CR'.sub.2 CR".sub.2 CSiCl.sub.2 with a difunctional nucleophile selected from the group consisting of (i) ammonia (ii) hydrazine (iii) diamines having the general formula HR'"NQNR""H at a temperature of minus 50° to +25° C. for a time sufficient to form polysilacyclobutasilazane; (II) recovering the polysilacyclobutasilazane from the reaction mass in (I) wherein each R, R', R", R'", and R"" is independently selected from hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups, and Q is a divalent hydrocarbon.
Claim 2
Dependent Claim
106 words
A polysilacyclobutasilazane composition prepared by a process comprising: (I) contacting and reacting in an inert, essentially anhydrous atmosphere, 1,1-dichloro-1-silacyclobutane having the general formula R.sub.2 CR'.sub.2 CR".sub.2 CSiCl.sub.2 with a difunctional nucleophile selected from the group consisting of (i) ammonia (ii) hydrazine (iii) diamines having the general formula HR'"NQNR""H at a temperature of minus 50° to +25° C. for a time sufficient to form polysilacyclobutasilazane; (II) recovering the polysilacyclobutasilazane from the reaction mass in (I) wherein each R, R', R", R'", and R"" is independently selected from hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups, and Q is a divalent hydrocarbon.
Claim 3
Dependent Claim
17 words
A composition as claimed in claim 1 wherein the difunctional nucleophile, ammonia, is used in the process.
Claim 4
Dependent Claim
17 words
A composition as claimed in claim 1 wherein the difunctional nucleophile, hydrazine, is used in the process.
Claim 5
Dependent Claim
21 words
A composition as claimed in claim 1 wherein a difunctional nucleophile, having the general formula HR"'NQNR""H, is used in the process.
Claim 6
Dependent Claim
25 words
A composition as claimed in claim 4 wherein the difunctional nucleophile, H 2 N(CH 2 ) 2 NH 2 , is used in the process.
Claim 7
Dependent Claim
25 words
A composition as claimed in claim 4 wherein the difunctional nucleophile, HCH 3 N(CH 2 ) 2 NCH 3 H, is used in the process.
Claim 8
Dependent Claim
29 words
A composition as claimed in claim 4 wherein the difunctional nucleophile, HC 2 H 5 N(CH 2 ) 2 NC 2 H 5 H, is used in the process.
Claim 9
Dependent Claim
17 words
A composition as claimed in claim 4 wherein the difunctional nucleophile, ##STR13## is used in the process.
Claim 10
Dependent Claim
34 words
A method of crosslinking the composition of claim 1, the method comprising heating the composition in the presence of essentially anhydrous air to a temperature in the range of 200° C. to 280° C.
Claim 11
Dependent Claim
20 words
A method as claimed in claim 9 wherein the composition is heated to a temperature of 220° to 260° C.
Claim 12
Dependent Claim
28 words
A method of crosslinking the composition of claim 1, the method comprising heating the composition in the absence of air to a temperature of 140° to 230° C.
Claim 13
Dependent Claim
20 words
A method as claimed in claim 11 wherein the composition is heated to a temperature of 185° to 210° C.
Claim 14
Dependent Claim
9 words
A composition prepared by the method of claim 9.
Claim 15
Dependent Claim
9 words
A composition prepared by the method of claim 11.
Claim 16
Dependent Claim
18 words
A composition as claimed in claim 1 wherein the reaction is carried out for at least two hours.
Claim 17
Dependent Claim
44 words
A polysilacyclobutasilazane having the structural formula ##STR14## where n has a value of at least 2 and each R, R', and R" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups.
Claim 18
Dependent Claim
44 words
A polysilacyclobutasilazane having the structural formula ##STR14## where n has a value of at least 2 and each R, R', and R" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups.
Claim 19
Dependent Claim
12 words
The polysilacyclobutasilazane of claim 16 where R, R', and R" are hydrogen.
Claim 20
Dependent Claim
44 words
A polysilacyclobutasilazane having the structural formula ##STR15## where n has a value of at least 2 and each R, R', and R" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups.
Claim 21
Dependent Claim
44 words
A polysilacyclobutasilazane having the structural formula ##STR15## where n has a value of at least 2 and each R, R', and R" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups.
Claim 22
Dependent Claim
12 words
The polysilacyclobutasilazane of claim 18 where R, R', and R" are hydrogen.
Claim 23
Dependent Claim
80 words
A polysilacyclobutasilazane having the structural formula ##STR16## where n has a value of at least 2; each R, R', R", R"', and R"" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups; and Q is a divalent hydrocarbon radical selected from the group consisting of alkylene radicals having 1 to 8 carbon atoms, arylene, alkarylene having 12 carbons or less and aralkylenes having 12 carbons or less.
Claim 24
Dependent Claim
80 words
A polysilacyclobutasilazane having the structural formula ##STR16## where n has a value of at least 2; each R, R', R", R"', and R"" is independently selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, aryl groups and vinyl groups; and Q is a divalent hydrocarbon radical selected from the group consisting of alkylene radicals having 1 to 8 carbon atoms, arylene, alkarylene having 12 carbons or less and aralkylenes having 12 carbons or less.
Claim 25
Dependent Claim
18 words
The polysilacyclobutasilazane of claim 20 where Q is an ethylene radical and R, R', and R" are hydrogen.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |