Patent US4066630A successfully refreshed from Google Patents.
US4066630A
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End capped polyalkylene carbonates having improved thermal stability
Assignee: PAC POLYMER Inc A CORP OF
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Filing: 1977-01-10
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Granted: 1978-01-03
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Expires: 1997-01-10
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 organic 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 10:50
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G63/00; C08G63/64; C08G64/20; C08G64/32; C08G64/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
177 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; R 1 , r 2 , r 3 and R 4 are combined together constituting a carboxylic ring of from 4 to 7 carbon atoms; and n is a number from about 250-6,500; 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 organic compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-carbon bond, said reaction being carried out under conditions sufficient for effecting said reaction.
Claim 2
Dependent Claim
177 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; R 1 , r 2 , r 3 and R 4 are combined together constituting a carboxylic ring of from 4 to 7 carbon atoms; and n is a number from about 250-6,500; 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 organic compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-carbon 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
49 words
The process of claim 3 wherein said hydroxyl reactive organic compound is selected from the group consisting of an organohalide, an organic acid chloride, an epoxide, an organic acid, organic acid ester, activated olefin, an organic isocyanate, an organic urea and urethane, an organic methylol compound and an organosulfate.
Claim 6
Dependent Claim
38 words
The process of claim 3 wherein said end-capping is accomplished by dispersing said polycarbonate in an inert carrier, reacting the polycarbonate with said hydroxyl reactive organic compound, and then recovering the resulting end-capped polycarbonate from said inert carrier.
Claim 7
Dependent Claim
16 words
The process of claim 4 wherein said hydroxyl reactive organic compound is a monofunctional organic compound.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein R 3 is hydrogen atom, or a methyl group.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein R 1 is hydrogen, or a phenyl group.
Claim 10
Dependent Claim
14 words
The process of claim 8 wherein R 1 and R 3 are hydrogen atoms.
Claim 11
Dependent Claim
21 words
The process of claim 3 wherein said hydroxyl reactive compound does not form a hydroxyl group on the capping carbon atom.
Claim 12
Dependent Claim
126 words
An end capped polycarbonate having improved thermal stability 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 toms; n is a number of from about 250 - 6,500 and Z is hydrogen or the residual of a hydrocarbyl radical having from 1 to 20 carbon atoms and substituted derivatives thereof.
Claim 13
Dependent Claim
126 words
An end capped polycarbonate having improved thermal stability 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 toms; n is a number of from about 250 - 6,500 and Z is hydrogen or the residual of a hydrocarbyl radical having from 1 to 20 carbon atoms and substituted derivatives thereof.
Claim 14
Dependent Claim
14 words
The polycarbonate of claim 11 wherein R 2 and R 4 are hydrogen atoms.
Claim 15
Dependent Claim
18 words
The composition of claim 12 wherein R 1 is selected from the group consisting of hydrogen and phenyl.
Claim 16
Dependent Claim
19 words
The polycarbonate of claim 13 wherein R 3 is selected from the group consisting of hydrogen and methyl groups.
Claim 17
Dependent Claim
13 words
The polycarbonate of claim 14 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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |