Patent US3935166A successfully refreshed from Google Patents.
US3935166A
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US
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Aromatic polyester of 2,6 and/or 2,7 naphthalene dicarboxylic acid
Assignee: Teijin Ltd
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Filing: 1974-08-22
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Granted: 1976-01-27
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Expires: 1994-08-22
Abstract
Abstract A linear aromatic polyester comprising, in the polymer molecule, at least 50 mole % of a repeating unit being represented by the formula ##SPC1## In which R 1 and R 2 are the same or different and represent an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2, With an intrinsic viscosity of 0.3 or more when measured at 35°C. by use of orthochlorophenol as a solvent.
Inventors
- 👤 Tamaki Kanai
- 👤 Takashi Yamagishi
- 👤 Tetsuya Ohta
- 👤 Hiroatsu Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/187; C08G63/189
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A linear aromatic polyester consisting essentially of, in the polymer molecule, about 50 to 100 mole % of a first repeating unit being represented by the formula ##SPC4## in which R 1 and R 2 are the same or different and represent an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2; and from 0 to about 50 mole % of a second repeating unit being represented by the formula ##SPC5## in which p is an integer of 1-6; with an intrinsic viscosity of 0.3 or more when measured at 35°C. by
Claim 2
Dependent Claim
106 words
A linear aromatic polyester consisting essentially of, in the polymer molecule, about 50 to 100 mole % of a first repeating unit being represented by the formula ##SPC4## in which R 1 and R 2 are the same or different and represent an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2; and from 0 to about 50 mole % of a second repeating unit being represented by the formula ##SPC5## in which p is an integer of 1-6; with an intrinsic viscosity of 0.3 or more when measured at 35°C. by
Claim 3
Dependent Claim
13 words
A polyester according to claim 1 in which the second repeating unit is
Claim 4
Dependent Claim
30 words
A polyester according to claim 2 in which the first repeating unit is at least 70 mole % and the second repeating unit is not more than 30 mole %.
Claim 5
Dependent Claim
13 words
A polyester according to claim 1, in which, in the first repeating unit,
Claim 6
Dependent Claim
168 words
A process for the production of a linear aromatic polyester which comprises: reacting at a temperature of from 150° to 240°C. naphthalenedicarboxylic acid of the formula ##SPC6## or its ester-forming derivative with (1) 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane being represented by the formula ##SPC7## in which R 1 and R 2 are the same or different and an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2, or its ester-forming derivative or (2) said 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane or its ester-forming derivative and at least one compound selected from the group consisting of (a) aromatic carboxylic acids different from said naphthalenedicarboxylic acid or their ester-forming derivatives and (b) glycols different from said 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane or their ester-forming derivatives, to form an ester; followed by polymerizing the ester so obtained at a temperature of 240° to 300°C.; with the proviso that the mole amount of the above glycol component be from 1 to 3.8 moles for every mole of the above acid component.
Claim 7
Dependent Claim
168 words
A process for the production of a linear aromatic polyester which comprises: reacting at a temperature of from 150° to 240°C. naphthalenedicarboxylic acid of the formula ##SPC6## or its ester-forming derivative with (1) 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane being represented by the formula ##SPC7## in which R 1 and R 2 are the same or different and an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2, or its ester-forming derivative or (2) said 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane or its ester-forming derivative and at least one compound selected from the group consisting of (a) aromatic carboxylic acids different from said naphthalenedicarboxylic acid or their ester-forming derivatives and (b) glycols different from said 4,4'-bis(hydroxyalkoxyphenyl)-2,2-alkane or their ester-forming derivatives, to form an ester; followed by polymerizing the ester so obtained at a temperature of 240° to 300°C.; with the proviso that the mole amount of the above glycol component be from 1 to 3.8 moles for every mole of the above acid component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |