US4235987A
Expired / Lapsed
US
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Method for producing carborane-siloxane polymers directly from carborane
Assignee: OSI Specialties Inc
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Filing: 1979-05-04
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Granted: 1980-11-25
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Expires: 1999-05-04
Abstract
Abstract A method is disclosed for preparing carborane-siloxane polymers directly from carborane which comprises reacting and polymerizing a dilithio salt of a carborane with a bis-halo-ended siloxane. This novel method offers the advantage of eliminating the expensive and time-consuming preparation of certain monomer intermediates of carborane employed in the preparation of carborane-siloxane polymers.
Inventors
- 👤 Edward N. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:24
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/56; C08G79/00; C08G79/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A method for preparing carboranesiloxane polymers having the following recurring unit: ##STR4## by reacting and polymerizing in equivalent molar proportions a dilithio salt of a carborane: Li--X--Li with a siloxane of the formula: ##STR5## wherein X represents a divalent radical derived from a carborane, Y represents a relatively labile moiety which forms a weak nucleophile with lithium; R 6 , R 7 , R 8 and R 9 , which may be the same or different, each represents a hydrogen atom or a group containing up to 14 carbon atoms and selected from the group consisting of alkyl, aryl, alkenyl, alkaryl, aralkyl, haloalkyl and haloaryl; and p is a positive integer of 1 to 4.
Claim 2
Independent Claim
115 words
A method for preparing carboranesiloxane polymers having the following recurring unit: ##STR4## by reacting and polymerizing in equivalent molar proportions a dilithio salt of a carborane: Li--X--Li with a siloxane of the formula: ##STR5## wherein X represents a divalent radical derived from a carborane, Y represents a relatively labile moiety which forms a weak nucleophile with lithium; R 6 , R 7 , R 8 and R 9 , which may be the same or different, each represents a hydrogen atom or a group containing up to 14 carbon atoms and selected from the group consisting of alkyl, aryl, alkenyl, alkaryl, aralkyl, haloalkyl and haloaryl; and p is a positive integer of 1 to 4.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein Y is a halogen atom or an acetyl group.
Claim 4
Dependent Claim
12 words
A method according to claim 1, wherein Y is a chlorine atom.
Claim 5
Dependent Claim
11 words
A method according to claim 1, wherein said carborane is meta-decacarborane.
Claim 6
Dependent Claim
28 words
A method according to claim 1, wherein said R 6 , R 7 , R 8 and R 9 are each alkyl of up to 7 carbon atoms.
Claim 7
Dependent Claim
23 words
A method according to claim 5, wherein each of said R 6 , R 7 , R 8 and R 9 is methyl.
Claim 8
Dependent Claim
32 words
A method according to claim 1, wherein one of said R 6 and R 7 is alkyl and the other is aryl, and said R 8 and R 9 are each alkyl.
Claim 9
Dependent Claim
33 words
A method according to claim 7, wherein one of said R 6 and R 7 is methyl and the other is phenyl, and wherein said R 8 and R 9 are each methyl.
References Cited (Backward Citations)
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US3397221A
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US3542730A
Cited
US3661847A
Cited
US3733298A
Cited
US4145504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |