US4404354A
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Polyphenylene-type polymeric compound and process for production thereof
Assignee: Kawamura Institute of Chemical Research
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Filing: 1982-12-28
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Granted: 1983-09-13
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Expires: 2002-12-28
Abstract
Abstract Polydialkoxyphenylenes composed of recurring structural units of the general formula ##STR1## wherein R and R' each represent an alkyl group having 1 to 4 carbon atoms, and R and R' may be identical or different, but in no case R and R' are both methyl groups. These compounds can be prepared by polymerizing p-dialkoxybenzenes in an inert solvent in the presence of a Lewis acid and an oxidant under reduced pressure.
Inventors
- 👤 Taku Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:58
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/10; C08G2261/00; C08G2261/30; C08G2261/31; C08G2261/312
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A poly(dialkoxyphenylene) composed of recurring structural units of the general formula ##STR16## wherein R and R' each represent an alkyl group having 1 to 4 carbon atoms, and R and R' may be identical or different, but in no case R and R' are both methyl groups.
Claim 2
Dependent Claim
47 words
A poly(dialkoxyphenylene) composed of recurring structural units of the general formula ##STR16## wherein R and R' each represent an alkyl group having 1 to 4 carbon atoms, and R and R' may be identical or different, but in no case R and R' are both methyl groups.
Claim 3
Dependent Claim
29 words
The polymer of claim 1 wherein R and R' are ethyl groups, and the polymer has an intrinsic viscosity [η], of from 0.05 to 1.00 in concentrated sulfuric acid.
Claim 4
Dependent Claim
29 words
The polymer of claim 1 wherein R and R' are n-propyl groups, and the polymer has an intrinsic viscosity [η], in concentrated sulfuric acid, of from 0.05 to 1.00.
Claim 5
Dependent Claim
27 words
The polymer of claim 1 wherein R and R' are n-butyl groups, and the polymer has an intrinsic viscosity, [η], in toluene, of from 0.05 to 1.50.
Claim 6
Dependent Claim
33 words
The polymer of claim 1 wherein R is a methyl group, R' is an ethyl group, and the polymer has an intrinsic viscosity [η], in concentrated sulfuric acid, of from 0.08 to 1.00.
Claim 7
Dependent Claim
32 words
The polymer of claim 1 wherein R is a methyl group, R' is a n-propyl group, and the polymer has an intrinsic viscosity [η], in concentrated sulfuric acid, of 0.08 to 1.00.
Claim 8
Dependent Claim
33 words
The polymer of claim 1 wherein R is a methyl group, R' is a n-butyl group, and the polymer has an intrinsic viscosity [η], in concentrated sulfuric acid, of from 0.08 to 1.50.
Claim 9
Dependent Claim
28 words
A process for producing a poly(dialkoxyphenylene) compound, which comprises polymerizing p-dialkoxybenzene in an inert solvent in the presence of a Lewis acid and an oxidant under reduced pressure.
Claim 10
Dependent Claim
28 words
A process for producing a poly(dialkoxyphenylene) compound, which comprises polymerizing p-dialkoxybenzene in an inert solvent in the presence of a Lewis acid and an oxidant under reduced pressure.
Claim 11
Dependent Claim
33 words
The process of claim 8 wherein nitrobenzene is used as the inert solvent, anhydrous aluminum chloride is used as the Lewis acid, and anhydrous or hydrous cupric chloride is used as the oxidant.
Claim 12
Dependent Claim
28 words
The process of claim 8 wherein a nitroalkane is used as the inert solvent and anhydrous ferric chloride is used both as the Lewis acid and the oxidant.
References Cited (Backward Citations)
US3405091A
Cited
US3576788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |