Patent US4684712A successfully refreshed from Google Patents.
US4684712A
Expired / Lapsed
US
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Process for producing wholly aromatic polyesters
Assignee: Ueno Seiyaku Oyo Kenkyujo KK
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Filing: 1986-06-06
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Granted: 1987-08-04
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Expires: 2006-06-06
Abstract
Abstract Wholly aromatic polyesters having improved mechanical properties are produced by polycondensing a raw material or raw material mixture capable of forming an aromatic polyester and not more than about 18 mole %, based on the total amount of the entire raw materials, of 2-hydroxynaphthalene-6-carboxylic acid or its derivative.
Inventors
- 👤 Ryuzo Ueno
- 👤 Kazuyuki Sakota
- 👤 Yasunori Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/065; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A process for producing an aromatic polyester, which comprises polycondensing an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, naphthalene-1,4-carboxylic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-ethylenedioxydibenzoic acid, 4,4'-thiobisbenzoic acid, and the aromatic polyester-forming derivatives thereof; with an aromatic diol selected from the group consisting of 4,4'-biphenol, 2,6-naphthalene diol, hydroquinone, bisphenol A, 1,1'-thio-4,4'-biphenol, and the aromatic polyester-forming derivatives thereof; and with an aromatic hydroxycarboxylic acid other than 2-hydroxynaphthalene-6-carboxylic acid or the aromatic polyester-forming derivative thereof and with not more than about 18 mole %, based on the amount of the entire raw materials, of 2-hydroxynaphthalene-6-carboxylic acid or an aromatic polyester-forming derivative thereof.
Claim 2
Dependent Claim
102 words
A process for producing an aromatic polyester, which comprises polycondensing an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, naphthalene-1,4-carboxylic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-ethylenedioxydibenzoic acid, 4,4'-thiobisbenzoic acid, and the aromatic polyester-forming derivatives thereof; with an aromatic diol selected from the group consisting of 4,4'-biphenol, 2,6-naphthalene diol, hydroquinone, bisphenol A, 1,1'-thio-4,4'-biphenol, and the aromatic polyester-forming derivatives thereof; and with an aromatic hydroxycarboxylic acid other than 2-hydroxynaphthalene-6-carboxylic acid or the aromatic polyester-forming derivative thereof and with not more than about 18 mole %, based on the amount of the entire raw materials, of 2-hydroxynaphthalene-6-carboxylic acid or an aromatic polyester-forming derivative thereof.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the amount of the 2-hydroxynaphthalene-6-carboxylic acid or its aromatic ester forming derivative is from about 2 to about 18 mole % based on the entire raw materials.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the aromatic hydroxycarboxylic acid other than 2-hydroxynaphthalene-6-carboxylic acid is p-acetoxybenzoic acid or an aromatic polyester-forming derivative thereof.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein the aromatic dicarboxylic acid is selected from the group consisting of terephthalic acid,naphtalene-2,6-dicarboxylic acid or an aromatic polyester-forming derivative thereof.
Claim 6
Dependent Claim
31 words
The process of claim 4 wherein the aromatic diol is selected from the group consisting of 4,4'-biphenol, 2,6-naphthalene diol, hydroquinone or an aromatic polyester-forming derivative of any one of said diols.
Claim 7
Dependent Claim
35 words
The process of claim 5 wherein the amount of the 2-hydroxynaphthalene-6-carboxylic acid or its aromatic ester forming derivative is from about 18 mole % to about 10 mole % based on the entire raw materials.
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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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |