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US4457828A
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Mesophase pitch having ellipspidal molecules and method for making the pitch
Assignee: BP Corp North America Inc
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Filing: 1982-03-30
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Granted: 1984-07-03
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Expires: 2002-03-30
Abstract
Abstract A mesophase pitch having ellipsoidal molecules is produced by the polymerization reaction of an aromatic hydrocarbon containing at least two condensed rings in which the coupling polymerization constitutes at least 60% of the polymerization reactions.
Inventors
- 👤 Irwin C. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:15
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; C; C10; C10C; C10C3/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
56 words
A mesophase pitch produced by the polymerization of an aromatic hydrocarbon containing at least two condensed rings in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 2
Dependent Claim
56 words
A mesophase pitch produced by the polymerization of an aromatic hydrocarbon containing at least two condensed rings in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 3
Independent Claim
67 words
A method for producing a mesophase pitch consisting essentially of a polymerization reaction of an aromatic hydrocarbon containing at least two condensed rings to produce a mesophase pitch in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 4
Independent Claim
67 words
A method for producing a mesophase pitch consisting essentially of a polymerization reaction of an aromatic hydrocarbon containing at least two condensed rings to produce a mesophase pitch in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 5
Independent Claim
65 words
A method for producing a mesophase pitch comprising a polymerization reaction of an aromatic hydrocarbon containing at least two condensed rings to produce a mesophase pitch in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 6
Independent Claim
65 words
A method for producing a mesophase pitch comprising a polymerization reaction of an aromatic hydrocarbon containing at least two condensed rings to produce a mesophase pitch in which the coupling polymerization constitutes at least 60% of the polymerization reactions, said polymerization being carried out with a weak Lewis acid and a polar solvent for said aromatic hydrocarbon, said solvent being non-reactive with said Lewis acid.
Claim 7
Dependent Claim
13 words
The method of claim 3, further comprising the steps of removing inorganic components.
Claim 8
Dependent Claim
32 words
The method of claim 3, wherein said polymerization produces a product, further comprising the steps of removing inorganic compounds from said product and thermally treating said product to increase its mesophase content.
Claim 9
Dependent Claim
17 words
The method of claim 5, wherein the thermal treatment of said product includes sparging of said product.
Claim 10
Dependent Claim
34 words
The method of claim 3, wherein said weak Lewis acid comprises anhydrous AlCl 3 and a second component which is a weaker acid and tends to reduce the activity of said AlCl 3 .
Claim 11
Dependent Claim
19 words
The method of claim 3, wherein said solvent is selected from the group consisting of o-dichlorobenzene, nitrobenzene, and trichlorobenzene.
Claim 12
Dependent Claim
19 words
The method of claim 3, wherein said weak Lewis acid comprises anhydrous AlCl 3 and anhydrous CuCl 2 .
Claim 13
Dependent Claim
34 words
A mesophase pitch produced by the method of claim 3 having ellipsoidal molecules, having a stack height from about 20 Å to about 25 Å and an interlayer spacing less than about 3.50 Å.
Claim 14
Dependent Claim
38 words
A mesophase pitch produced by the method of claim 3 having ellipsoidal molecules and being capable of mixing uniformly with both rod-like and discotic nematic liquid crystals when said mesophase pitch has about 100% by weight mesophase content.
Claim 15
Dependent Claim
17 words
The method of claim 3, wherein said solvent has a boiling point higher than about 100° C.
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |