US3875112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polycarbonates with aliphatic hydroxyl groups
Assignee: Bayer AG
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Filing: 1972-04-19
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Granted: 1975-04-01
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Expires: 1992-04-19
Abstract
Abstract Aromatic polycarbonates with functional, aliphatic hydroxyl groups are provided and a process for preparing them in a phase boundary reaction carried out at a pH value of 8 - 13.5, preferably 12 - 13.
Inventors
- 👤 August Bockmann
- 👤 Dieter Margotte
- 👤 Hans Rudolph
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/16; C08G64/1608; C08G64/20; C08G64/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A PROCESS FOR THE PRODUCTION OF AN AROMATIC POLYCARBONATE COMPRISING REACTING PHOSGENE WITH ONE OR MORE COMPOUNDS HAVING AT LEAST TWO AROMATIC HYDROXYL GROUPS AND WITH ONE OR MORE COMPOUNDS HAVING ONE AROMATIC HYDROXYL GROUP WITH THE PROVISO THAT AT LEAST ONE COMPOUND HAVING ONE OR AT LEAST TWO AROMATIC HYDROXYL GROUPS ALSO HAS AT LEAST ONE ALIPHATIC HYDROXYL GROUP, BY INTERFACIAL CONDENSATION WHILE MAINTAINING THE PH OF THE RESULTANT REACTION MIXTURE IN THE RANGE OF 8 TO 13.5 WHEREBY SUBSTANTIALLY ALL THE ALIPHATIC HYDROXYL GROUPS REMAIN UNREACTED.
Claim 2
Dependent Claim
88 words
A PROCESS FOR THE PRODUCTION OF AN AROMATIC POLYCARBONATE COMPRISING REACTING PHOSGENE WITH ONE OR MORE COMPOUNDS HAVING AT LEAST TWO AROMATIC HYDROXYL GROUPS AND WITH ONE OR MORE COMPOUNDS HAVING ONE AROMATIC HYDROXYL GROUP WITH THE PROVISO THAT AT LEAST ONE COMPOUND HAVING ONE OR AT LEAST TWO AROMATIC HYDROXYL GROUPS ALSO HAS AT LEAST ONE ALIPHATIC HYDROXYL GROUP, BY INTERFACIAL CONDENSATION WHILE MAINTAINING THE PH OF THE RESULTANT REACTION MIXTURE IN THE RANGE OF 8 TO 13.5 WHEREBY SUBSTANTIALLY ALL THE ALIPHATIC HYDROXYL GROUPS REMAIN UNREACTED.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the pH is maintained in the range of 12 to 13.
Claim 4
Dependent Claim
43 words
The process of claim 1 wherein the phosgene is reacted with a mixture of a compound containing, per molecule, at least two aromatic hydroxyl groups and at least one aliphatic hydroxyl group and a dihydroxy compound containing, per molecule, two aromatic hydroxyl groups.
Claim 5
Dependent Claim
41 words
The process of claim 1 wherein the phosgene is reacted with a mixture of a compound containing, per molecule, one aromatic hydroxyl group and at least one aliphatic hydroxyl group and a dihydroxy compound containing, per molecule, two aromatic hydroxyl groups.
Claim 6
Dependent Claim
63 words
The process of claim 1 wherein the phosgene is reacted with a mixture of (a) a compound containing, per molecule, at least two aromatic hydroxyl groups and at least one aliphatic hydroxyl group, (b) a compound containing, per molecule, one aromatic hydroxyl group and at least one aliphatic hydroxyl group and a dihydroxy compound containing, per molecule, two aromatic hydroxyl groups. (c) a
Claim 7
Dependent Claim
23 words
The process of claim 3 wherein the phosgene is reacted with a mixture of (a) the glycerin bis-ether of 2,2-bis-(4-hydroxyphenyl)-propane and (b) 2,2-bis-(4-hydroxyphenyl)-propane.
Claim 8
Dependent Claim
24 words
The process of claim 4 wherein the phosgene is reacted with a mixture of (a) the mono-( Beta -hydroxyethyl)-ether of 2,2-bis-(4-hydroxyphenyl)-propane and (b) 2,2-bis-(4-hydroxyphenyl)-propane.
Claim 9
Dependent Claim
30 words
The process of claim 5 wherein the phosgene is reacted with a mixture of (a) the glycerin bis-ether of 2,2-bis-(4-hydroxy-phenyl)-propane, (b) the mono- Beta -hydroxyethyl)-ether of 2,2-bis-(4-hydroxyphenyl)-propane and (c) 2,2-bis-(4-hydroxyphenyl)-propane.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein one of said compounds reacted with phosgene has at least three aromatic hydroxyl groups.
Claim 11
Dependent Claim
9 words
An aromatic polycarbonate produced by the process of claim
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein the compound containing at least one aliphatic hydroxyl group is a compound having at least two aromatic hydroxyl groups.
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein the phosgene is reacted with the glycerin bis-ether of 2,2-bis-(4-hydroxyphenyl)-propane.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the polycarbonate produced has a hydroxy value of between about 30 and 100.
Claim 15
Dependent Claim
10 words
An aromatic polycarbonate produced by the process of claim 13.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |