US4983713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resin exhibiting optical anisotropy in molten state containing minor amounts of 6-oxy-2-naphthoyl units
Assignee: Polyplastics Co Ltd
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Filing: 1989-07-03
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Granted: 1991-01-08
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Expires: 2009-07-03
Abstract
Abstract A novel polyester resin is provided which exhibits an anisotropic melt phase. The polymer comprises recurring 4-oxybenzoyl units, 6-oxy-2-naphthoyl units, aromatic dicarboxy units, and aromatic diol units as described in appropriate concentrations. The resulting polyester exhibits excellent melt processability in combination with good mechanical properties and a good retention of properties at elevated temperatures.
Inventors
- 👤 Noriyuki Hayashi
- 👤 Yukihiko Kageyama
- 👤 Kenji Hijikata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:14
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/78
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A polyester resin exhibiting optical anisotropy in a molten state which comprises constituent units represented by the following formulas (I) to (IV) wherein the concentrations of the units (I), (II), (III) and (IV) are 50 to 85 mole percent, 0.5 to 2.8 mole percent, 0.5 to 30 mole percent and 0.5 to 30 mole percent respectively, based on the total amount of the constituent units: ##STR6## wherein Ar is a divalent group having at least one aromatic ring, --O--Ar'--O-- (IV) wherein Ar' is a divalent group having at least two aromatic rings.
Claim 2
Dependent Claim
92 words
A polyester resin exhibiting optical anisotropy in a molten state which comprises constituent units represented by the following formulas (I) to (IV) wherein the concentrations of the units (I), (II), (III) and (IV) are 50 to 85 mole percent, 0.5 to 2.8 mole percent, 0.5 to 30 mole percent and 0.5 to 30 mole percent respectively, based on the total amount of the constituent units: ##STR6## wherein Ar is a divalent group having at least one aromatic ring, --O--Ar'--O-- (IV) wherein Ar' is a divalent group having at least two aromatic rings.
Claim 3
Dependent Claim
114 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 1 further comprising one or more constituent units selected from among those represented by the following formulas (V) to (VII) with the proviso that the concentrations of the units (V), (VI) and (VII) are at most 5 mole percent, at most 10 mole percent, and at most 30 mole percent respectively, based on the total amount of the constituent units: ##STR7## wherein X and Y are the same or different from each other and are each ##STR8## or --O--, ##STR9## wherein Z is ##STR10## or --O--, and --O--Ar"--O-- (VII) wherein Ar" is a divalent group having at least one aromatic ring.
Claim 4
Dependent Claim
21 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 1 wherein the Ar of the formula ##STR11##
Claim 5
Dependent Claim
22 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 2 wherein the Ar of the formula (III) is
Claim 6
Dependent Claim
38 words
A polyester resin composition comprising a polyester resin exhibiting optical anisotropy in a molten state according to claim 1 and at most 95 percent by weight of an inorganic filler based on the weight of the polyester resin.
Claim 7
Dependent Claim
39 words
A polyester resin composition comprising a polyester resin exhibiting optical anisotropy in a molten state according to claim 2 and at most 95 percent by weight of an inorganic filler based on the total weight of the polyester resin.
Claim 8
Dependent Claim
39 words
A polyester resin composition comprising a polyester resin exhibiting optical anisotropy in a molten state according to claim 3 and at most 95 percent by weight of an inorganic filler based on the total weight of the polyester resin.
Claim 9
Dependent Claim
68 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 1 wherein unit (I) is present in a concentration of 60 to 80 mole percent, unit (II) is present in a concentration of 1 to 2.8 mole percent, unit (III) is present in a concentration of 10 to 30 mole percent, and unit (IV) is present in a concentration of 10 to 30 mole percent.
Claim 10
Dependent Claim
26 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 8 wherein unit (III) is derived from terephthalic acid or a derivative thereof.
Claim 11
Dependent Claim
25 words
A polyester resin exhibiting optical anisotropy in a molten state according to claim 8 wherein unit (IV) is derived from 4,4'-dihydroxybiphenyl or a derivative thereof.
References Cited (Backward Citations)
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |