US4414381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic polyester anhydride polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1981-12-07
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Granted: 1983-11-08
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Expires: 2001-12-07
Abstract
Abstract A melt-processable aromatic polyester anhydride characterized in that from 5 to 80% of the units linking the reactant residues in the polymer chain have the formula: <IMAGE> the remaining linkages between the residues of the reactants being of the formula: <IMAGE> optionally together with linkages of the formula: <IMAGE> substantially all of said remaining linkages being disposed in coaxial or parallel and oppositely directed manner with respect to the residues to which they are linked, the polyester anhydride having a solubility of less than 5% by weight in dimethyl sulphoxide at room temperature.
Inventors
- 👤 Brian P. Griffin
- 👤 William A. MacDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:52
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G67/00; C08G67/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A melt-processable aromatic polyester anhydride characterised in that from 5 to 80% of the units linking the aromatic reactant residues in the polymer chain have the formula: ##STR20## the remaining linkages between the residues of the aromatic reactants being of the formula: ##STR21## optionally together with linkages of the formula: ##STR22## substantially all of said remaining linkages being disposed in coaxial or parallel and oppositely directed manner with respect to the residues to which they are linked, the polyester anhydride having a solubility of less than 5% by weight in dimethyl sulphoxide at room temperature.
Claim 2
Dependent Claim
95 words
A melt-processable aromatic polyester anhydride characterised in that from 5 to 80% of the units linking the aromatic reactant residues in the polymer chain have the formula: ##STR20## the remaining linkages between the residues of the aromatic reactants being of the formula: ##STR21## optionally together with linkages of the formula: ##STR22## substantially all of said remaining linkages being disposed in coaxial or parallel and oppositely directed manner with respect to the residues to which they are linked, the polyester anhydride having a solubility of less than 5% by weight in dimethyl sulphoxide at room temperature.
Claim 3
Dependent Claim
123 words
An aromatic polyester anhydride according to claim 1 characterised in that the anhydride residues are obtained from the reaction, with ester-forming aromatic reactants, of a mixed anhydride of formula: ##STR23## wherein X is a divalent radical comprising one or more fused or separate aromatic rings, Y may be a direct link, a --(CH 2 ) n -- group or a --(CH 2 ) n O-- group in which n may be from 1 to 4 and the ether oxygen, if present, is linked directly to X, R 1 is an acyl radical derived from an aliphatic monocarboxylic acid and G is a functional group capable of entering into chain extending reactions and which may be the same or different to the radical ##STR24##
Claim 4
Dependent Claim
56 words
An aromatic polyester anhydride according to claim 1 or claim 2 in which Y is a direct link, X is a single aromatic ring and the carboxyl group of the mixed anhydride is disposed in para, meta or ortho positions on the single ring in relation to the group G attached to the single aromatic ring.
Claim 5
Dependent Claim
38 words
An aromatic polyesteranhydride according to claim 1 in which the ##STR25## linkages are the residues of reactants selected from the group consisting of dihydric phenols, hydroxyaryl carboxylic acids, mixtures of dihydric phenols and dicarboxylic acids and amino phenols.
Claim 6
Dependent Claim
54 words
A melt-processable aromatic polyester anhydride according to claim 1 in which from 20 to 95 mole % of the residues of the polymer are residues of 6-hydroxy-2-naphthoic acid or a polyester-forming derivative thereof and from 0 to 50 mole % of the residues of the polymer are residues of other polyester- or polyamide-forming reactants.
Claim 7
Dependent Claim
15 words
An aromatic polyester anhydride according to claim 1 which is capable of exhibiting thermotropic behaviour.
Claim 8
Dependent Claim
11 words
A thermotropic melt of a polyester anhydride according to claim 1.
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |