Patent EP0090475A1 successfully refreshed from Google Patents.
EP0090475A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mesophase pitch having ellipsoidal molecules and method for making the pitch
Assignee: BP Corp North America Inc
•
Filing: 1983-03-29
•
Granted: —
•
Expires: 2003-03-29
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 Charles Lewis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:24
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; C; C10; C10C; C10C3/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
30 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.
Claim 2
Dependent Claim
30 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.
Claim 3
Independent Claim
41 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.
Claim 4
Independent Claim
41 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.
Claim 5
Independent Claim
39 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.
Claim 6
Independent Claim
39 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.
Claim 7
Dependent Claim
14 words
4, 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
47 words
The method of Claim 3, wherein said polymerization reaction is carried out with a weak Lewis acid in the presence of a solvent which is non-reactive with said Lewis acid, polar, has a boiling point higher than about 100°C, and is a solvent for said aromatic hydrocarbon.
Claim 11
Dependent Claim
34 words
The method of Claim 7, wherein said weak Lewis acid comprises anhydrous Ale1 3 and a second component which is a weaker acid and tends to reduce the activity of said AlC1 3 .
Claim 12
Dependent Claim
19 words
The method of Claim 7, wherein said solvent is selected from the group consisting of o-dichlorobenzene, nitrobenzene, and trichlorobenzene.
Claim 13
Dependent Claim
19 words
The method of Claim 7, wherein said weak Lewis acid comprises anhydrous AlCl 3 and anhydrous CuCl 2 .
Claim 14
Dependent Claim
30 words
A mesophase pitch having ellipsoidal o molecules, having a stack height from about 20 A to o about 25 A and an interlayer spacing less than about o 3.50 A
Claim 15
Dependent Claim
30 words
A mesophase pitch having ellipsoidal o molecules, having a stack height from about 20 A to o about 25 A and an interlayer spacing less than about o 3.50 A
Claim 16
Dependent Claim
31 words
A mesophase pitch 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 17
Dependent Claim
31 words
A mesophase pitch 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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.