Patent US4104264A successfully refreshed from Google Patents.
US4104264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End capped polyalkylene carbonates having improved thermal stablity
Assignee: PAC POLYMER Inc A CORP OF
•
Filing: 1977-05-05
•
Granted: 1978-08-01
•
Expires: 1997-05-05
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 sulfur compound. The resulting end capped polycarbonates are useful for producing molded products, films, and packages which are resistant to thermal degradation.
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 08:24
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G64/0216; C08G64/0225; C08G64/025; C08G64/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
160 words
A process for improving the thermal stability of a normally solid polyalkylene carbonate 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 polyalkylene carbonate by reacting said hydroxyl groups with a hydroxyl reactive sulfur compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-sulfur bond.
Claim 2
Dependent Claim
160 words
A process for improving the thermal stability of a normally solid polyalkylene carbonate 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 polyalkylene carbonate by reacting said hydroxyl groups with a hydroxyl reactive sulfur compound having the ability to replace the active hydrogen atom on said hydroxyl group for forming an oxygen-sulfur bond.
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
29 words
The process of claim 3 wherein said hydroxyl reactive sulfur compound is selected from the group consisting of a sulfonyl halide, sulfenyl halide, sulfonate ester, disulfide, and sulfonyl cyanide.
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 sulfur compound is a monofunctional sulfur compound.
Claim 8
Dependent Claim
15 words
The process of claim 4 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
15 words
The process of claim 9 wherein said hydroxyl reactive sulfur compound is a sulfonyl chloride.
Claim 12
Dependent Claim
124 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 atoms; n is a number of from about 250 - 6,500 and Z is the residual of a hydrocarbyl radical having from 1 to 20 carbon atoms and substituted derivatives thereof.
Claim 13
Dependent Claim
124 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 atoms; n is a number of from about 250 - 6,500 and Z is 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 polycarbonate 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.
References Cited (Backward Citations)
US3177179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |