US4686276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing poly (alkylene carbonates)
Assignee: Dow Chemical Co
•
Filing: 1985-12-30
•
Granted: 1987-08-11
•
Expires: 2005-12-30
Abstract
Abstract An improved process for the preparation of poly(alkylene carbonate) polymer by the reaction of alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure is disclosed. The improvement comprises conducting said reaction in the presence of a catalyst mixture comprising an alkaline catalyst and a stannate compound.
Inventors
- 👤 Michael O. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:36
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G64/20; C08G64/30; C08G64/302; C08G64/32; C08G64/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
65 words
An improved process for the preparation of a poly(alkylene carbonate)polymer by the reaction of an alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure, the improvement comprising conducting said reaction in the presence of a catalytic amount of a catalyst mixture comprising an alkaline catalyst and a metal stannate salt, a tetraalkyl stannane compound and/or a tetraalkoxy stannate compound.
Claim 2
Dependent Claim
65 words
An improved process for the preparation of a poly(alkylene carbonate)polymer by the reaction of an alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure, the improvement comprising conducting said reaction in the presence of a catalytic amount of a catalyst mixture comprising an alkaline catalyst and a metal stannate salt, a tetraalkyl stannane compound and/or a tetraalkoxy stannate compound.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said stannate compound comprises an alkali metal stannate, or an alkaline earth stannate.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein said alkaline catalyst comprises a magnesium, calcium, cesium or barium salt of an organic acid, or organic compound containing a basic nitrogen atom.
Claim 5
Dependent Claim
21 words
The process of claim 2 wherein said alkaline catalyst comprises an alkali metal or alkaline earth metal carbonate, phosphate or metaborate.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein said alkaline catalyst comprises sodium carbonate, potassium carbonate or sodium metaborate.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said stannate compound comprises sodium or potassium stannate.
Claim 8
Dependent Claim
27 words
The process of claim 6 wherein the reaction is conducted at a temperature of about 100°-300° C. and a pressure of about 100 to about 1500 psi.
Claim 9
Dependent Claim
26 words
The process of claim 7 wherein said alkylene oxide is reacted with an alkylene carbonate, and said pressure is from about 140 to about 500 psi.
Claim 10
Dependent Claim
19 words
The process of claim 8 wherein said alkylene oxide comprises ethylene oxide and said alkylene carbonate comprises ethylene carbonate.
Claim 11
Dependent Claim
14 words
The process of claim 7 wherein said alkylene oxide is reacted with carbon dioxide.
Claim 12
Dependent Claim
25 words
The process of claim 10 wherein said alkylene oxide and carbon dioxide are gradually added to the reaction, said additions being conducted under reaction conditions.
Claim 13
Dependent Claim
27 words
The process of claim 11 wherein said carbon dioxide is gradually added to the reaction over a shorter period of time than the alkylene oxide is added.
Claim 14
Dependent Claim
12 words
The process of claim 12 wherein said alkylene oxide is ethylene oxide.
Claim 15
Dependent Claim
12 words
The process of claim 13 wherein the pressure is about 150-225 psi.
Claim 16
Dependent Claim
57 words
An improved process for the preparation of a poly(alkylene carbonate) polymer by the reaction of an alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure, the improvement comprising conducting said reaction in the presence of a catalyst mixture comprising an alkaline catalyst and an alkali or alkaline earth metal stannate salt.
Claim 17
Dependent Claim
57 words
An improved process for the preparation of a poly(alkylene carbonate) polymer by the reaction of an alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure, the improvement comprising conducting said reaction in the presence of a catalyst mixture comprising an alkaline catalyst and an alkali or alkaline earth metal stannate salt.
References Cited (Backward Citations)
US3248416A
Cited
US3248415A
Cited
US3248414A
Cited
US3585168A
Cited
US3689462A
Cited
US3764457A
Cited
US3896090A
Cited
US4066630A
Cited
US4222954A
Cited
US4330481A
Cited
US4264752A
Cited
US4267120A
Cited
US4528364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |