US4728691A
Expired / Lapsed
US
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Composition and process for polymerizing aromatic cyclic carbonate oligomers admixed with carbon materials
Assignee: General Electric Co
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Filing: 1986-12-09
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Granted: 1988-03-01
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Expires: 2006-12-09
Abstract
Abstract A method for producing a high molecular weight polycarbonate admixed with carbon materials which comprises (a) adding a polymerizing effective amount of an acidic metallic catalyst system to aromatic cyclic carbonate oligomers admixed with a carbon material, and (b) polymerizing the mixture of carbon material and aromatic cyclic carbonate oligomers to a high molecular weight aromatic polycarbonate.
Inventors
- 👤 Niles R. Rosenquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:59
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y10; Y10S; Y10S524/00; Y10S524/907
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
57 words
A method for producing a high molecular weight polycarbonate admixed with carbon materials which comprises (a) adding a polymerizing effective amount of an acidic metallic catalyst system to aromatic cyclic carbonate oligomers admixed with a carbon material, and (b) polymerizing the mixture of carbon material and aromatic cyclic carbonate oligomers to a high molecular weight aromatic polycarbonate.
Claim 2
Independent Claim
57 words
A method for producing a high molecular weight polycarbonate admixed with carbon materials which comprises (a) adding a polymerizing effective amount of an acidic metallic catalyst system to aromatic cyclic carbonate oligomers admixed with a carbon material, and (b) polymerizing the mixture of carbon material and aromatic cyclic carbonate oligomers to a high molecular weight aromatic polycarbonate.
Claim 3
Dependent Claim
28 words
The process in accordance with claim 1 wherein the carbon is in the physical form of the group consisting of powder, granule, fiber, flake, mat, strand or whisker.
Claim 4
Dependent Claim
18 words
The process in accordance with claim 2 wherein the carbon is in the form of powder or granules.
Claim 5
Dependent Claim
23 words
The process in accordance with claim 3 wherein the carbon is from about 0.2 to 30 weight percent of the polycarbonate plus carbon.
Claim 6
Dependent Claim
17 words
The process in accordance with claim 1 wherein the acidic metallic catalyst system has a transition metal.
Claim 7
Dependent Claim
13 words
The process in accordance with claim 5 wherein the transition metal is titanium.
Claim 8
Dependent Claim
13 words
The process in accordance with claim 6 wherein the catalyst system is tetraoctyltitanate.
Claim 9
Dependent Claim
27 words
The process in accordance with claim 1 wherein the minimum intrinsic viscosity at 25° C. in methylene chloride of the high molecular weight polycarbonate is about 0.40.
Claim 10
Dependent Claim
15 words
The process in accordance with claim 1 wherein the oligomers are bisphenol-A cyclic carbonate oligomers.
Claim 11
Dependent Claim
23 words
A composition of aromatic cyclic carbonate oligomers admixed with a carbon material and a polymerizing effective amount of an acidic metallic catalyst system.
Claim 12
Dependent Claim
23 words
A composition of aromatic cyclic carbonate oligomers admixed with a carbon material and a polymerizing effective amount of an acidic metallic catalyst system.
Claim 13
Dependent Claim
28 words
The composition in accordance with claim 10 wherein the carbon is in the physcial form of the group consisting of powder, granule, fiber, flake, mat, strand or whisker.
Claim 14
Dependent Claim
18 words
The composition in accordance with claim 11 wherein the carbon is in the form of powder or granules.
Claim 15
Dependent Claim
23 words
The composition in accordance with claim 12 wherein the carbon is from about 0.2 to 30 weight percent of the polycarbonate plus carbon.
Claim 16
Dependent Claim
17 words
The composition in accordance with claim 10 wherein the acidic metallic catalyst system has a transition metal.
Claim 17
Dependent Claim
13 words
The composition in accordance with claim 14 wherein the transition metal is titanium.
Claim 18
Dependent Claim
13 words
The composition in accordance with claim 15 wherein the catalyst system is tetraoctyltitanate.
Claim 19
Dependent Claim
15 words
The composition in accordance with claim 10 wherein the oligomers are bisphenol-A cyclic carbonate oligomers.
References Cited (Backward Citations)
US4255557A
Cited
US4644053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |