Patent US4365055A successfully refreshed from Google Patents.
US4365055A
Expired / Lapsed
US
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Process for producing substantially linear carbonate polymer
Assignee: PPG Industries Inc
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Filing: 1981-06-24
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Granted: 1982-12-21
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Expires: 2001-06-24
Abstract
Abstract In the preparation of a substantially linear carbonate polymer wherein carbonic dihalide is introduced to a substantially anhydrous solution comprising at least one substituted or unsubstituted 1,3-propanediol, the coproduction of cyclic carbonate is reduced by the presence in the solution of a catalytic amount of nitrogen-containing, hydrohalide salt-forming, thermally regenerable organic catalyst. The preferred carbonic dihalide is phosgene and the preferred catalyst is pyridine.
Inventors
- 👤 Darold L. Madigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:37
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G64/20; C08G64/22; C08G64/226
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
70 words
A process for producing substantially linear carbonate polymer comprising: a. introducing carbonic dihalide to substantially anhydrous solution comprising inert organic solvent, at least one substituted or unsubstituted 1,3-propanediol and a catalytic amount of nitrogen-containing, hydrohalide salt-forming, thermally regenerable organic catalyst, while the temperature of said solution is in the range of from about 70° C. to about 225° C.; and b. removing hydrogen halide from the vicinity of said solution.
Claim 2
Dependent Claim
70 words
A process for producing substantially linear carbonate polymer comprising: a. introducing carbonic dihalide to substantially anhydrous solution comprising inert organic solvent, at least one substituted or unsubstituted 1,3-propanediol and a catalytic amount of nitrogen-containing, hydrohalide salt-forming, thermally regenerable organic catalyst, while the temperature of said solution is in the range of from about 70° C. to about 225° C.; and b. removing hydrogen halide from the vicinity of said solution.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein the molar ratio of said catalyst to said 1,3-propanediol present in said solution at the time of said carbonic dihalide introduction is in the range of from about 0.005:1 to about 0.05:1.
Claim 4
Dependent Claim
38 words
The process of claim 1 wherein the molar ratio of said catalyst to said 1,3-propanediol present in said solution at the time of said carbonic dihalide introduction is in the range of from about 0.02:1 to about 0.04:1.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said carbonic dihalide is phosgene.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said catalyst is pyridine, di(methylamino)pyridine, imidazole, 2,6-lutidine, 2,4,6-collidine or a mixture thereof.
Claim 7
Dependent Claim
10 words
The process of claim 1 wherein said catalyst is pyridine.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said carbonic dihalide is phosgene.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said carbonic dihalide and said 1,3-propanediol are ultimately employed in about equimolar amounts.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein from about 0.9 molar part to about 1.1 molar part of said carbonic dihalide is ultimately introduced per molar part of said 1,3-propanediol employed.
Claim 11
Dependent Claim
10 words
The process of claim 1 wherein said 1,3-propanediol is 1,3-propanediol.
Claim 12
Dependent Claim
10 words
The process of claim 1 wherein said 1,3-propanediol is 2,2-bis(bromomethyl)-1,3-propanediol.
Claim 13
Dependent Claim
10 words
The process of claim 1 wherein said 1,3-propanediol is 2,2-dimethyl-1,3-propanediol.
Claim 14
Dependent Claim
12 words
The process of claim 1 wherein said inert organic solvent is toluene.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said inert organic solvent is xylene.
Claim 16
Dependent Claim
27 words
The process of claim 1 wherein the weight ratio of said inert solvent to dissolved solids is in the range of from about 0.5:1 to about 100:1.
Claim 17
Dependent Claim
27 words
The process of claim 1 wherein the weight ratio of said inert solvent to dissolved solids is in the range of from about 1:1 to about 3:1.
Claim 18
Dependent Claim
24 words
The process of claim 1 wherein said temperature of said solution is in the range of from about 80° C. to about 100° C.
Claim 19
Dependent Claim
21 words
The process of claim 1 wherein said carbonic dihalide is gradually introduced to said solution while said solution is at reflux.
Claim 20
Dependent Claim
11 words
The process of claim 18 wherein said carbonic dihalide is phosgene.
Claim 21
Dependent Claim
71 words
The process of claim 1 wherein said carbonic dihalide is gradually introduced to said solution while the temperature of said solution is in the range of from about 80° C. to about 90° C. but below the reflux temperature, and wherein after said introduction has been substantially completed, the temperature of said solution is raised to a reflux temperature in the range of from above 90° C. to about 225° C.
Claim 22
Dependent Claim
22 words
The process of claim 20 wherein said reflux temperature is in the range of from above 110° C. to about 140° C.
Claim 23
Dependent Claim
11 words
The process of claim 20 wherein said carbonic dihalide is phosgene.
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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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |