US4145525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End capped polyalkylene carbonates
Assignee: PAC POLYMER Inc A CORP OF
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Filing: 1977-10-03
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Granted: 1979-03-20
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Expires: 1997-10-03
Abstract
Abstract Polycarbonates, of the type formed by reacting an aliphatic or cycloaliphatic 1,2-monoepoxide with carbon dioxide and having substantially alternating units of epoxide and carbon dioxide, are improved in thermal stability by reacting the free hydroxyl groups thereon with a hydroxyl reactive phosphorus compound.
Inventors
- 👤 Dale D. Dixon
- 👤 Michael E. Ford
- 👤 Gerald J. Mantell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:55
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/42; C08G64/02; C08G64/0208; C08G64/0225; C08G64/0258; C08G64/20; C08G64/32; C08G64/34
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
170 words
A process for improving the thermal stability of a normally solid polycarbonate having substantially alternating epoxide and carbon dioxide units and having a plurality of free hydroxyl groups represented by the formula: ##STR3## wherein: R 1 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen or a hydrocarbyl group having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring of from 4 to 7 carbon atoms; which comprises end-capping at least a portion of the free hydroxyl groups of said polycarbonate by reacting said hydroxyl groups with a hydroxyl reactive phosphorus compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-phosphorus bond, said reaction being carried out under conditions sufficient for effecting said reaction.
Claim 2
Dependent Claim
170 words
A process for improving the thermal stability of a normally solid polycarbonate having substantially alternating epoxide and carbon dioxide units and having a plurality of free hydroxyl groups represented by the formula: ##STR3## wherein: R 1 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen or a hydrocarbyl group having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring of from 4 to 7 carbon atoms; which comprises end-capping at least a portion of the free hydroxyl groups of said polycarbonate by reacting said hydroxyl groups with a hydroxyl reactive phosphorus compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-phosphorus bond, said reaction being carried out under conditions sufficient for effecting said reaction.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein R 2 and R 4 are hydrogen atoms.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein R 1 and R 3 are hydrogen, a lower alkyl group having from 1 to 2 carbon atoms, or a phenyl group.
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein said hydroxyl reactive phosphorus compound is selected from the group consisting of a halophosphine, halophosphonate, halophosphate and halophosphite.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein R 3 is hydrogen atom, or a methyl group.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein R 1 is hydrogen, or a phenyl group.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein R 1 and R 3 are hydrogen atoms.
Claim 9
Dependent Claim
21 words
The process of claim 4 wherein said phosphorus compound is selected from the group consisting of chlorodiphenyl phosphine and chlorodiphenyl phosphate.
Claim 10
Dependent Claim
137 words
An end-capped polycarbonate having improved thermal stability formed by reacting a normally solid polycarbonate having substantially alternating epoxide and carbon dioxide units and a plurality of free hydroxyl groups represented by the formula: ##STR4## wherein: R 1 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen or a hydrocarbyl group having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring of from 4 to 7 carbon atoms; with a hydroxyl reactive phosphorus compound whereby the active hydrogen atom on the hydroxyl group is replaced and an oxygen-phosphorus bond formed.
Claim 11
Dependent Claim
137 words
An end-capped polycarbonate having improved thermal stability formed by reacting a normally solid polycarbonate having substantially alternating epoxide and carbon dioxide units and a plurality of free hydroxyl groups represented by the formula: ##STR4## wherein: R 1 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen or a hydrocarbyl group having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring of from 4 to 7 carbon atoms; with a hydroxyl reactive phosphorus compound whereby the active hydrogen atom on the hydroxyl group is replaced and an oxygen-phosphorus bond formed.
Claim 12
Dependent Claim
14 words
The polycarbonate of claim 9 wherein R 2 and R 4 are hydrogen atoms.
Claim 13
Dependent Claim
18 words
The composition of claim 10 wherein R 1 is selected from the group consisting of hydrogen and phenyl.
Claim 14
Dependent Claim
19 words
The polycarbonate of claim 11 wherein R 3 is selected from the group consisting of hydrogen and methyl groups.
Claim 15
Dependent Claim
13 words
The polycarbonate of claim 12 wherein n is from about 500 to 1,500.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |