US4851503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wholly aromatic thermotropic liquid crystal polyester
Assignee: Kuraray Co Ltd
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Filing: 1987-12-18
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Granted: 1989-07-25
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Expires: 2007-12-18
Abstract
Abstract A novel wholly aromatic thermotropic liquid crystal polyester consisting essentially of 4-oxybenzoyl unit, terephthaloyl unit, 4,4'-dioxydiphenyl unit and 4,4'-dioxydiphenyl ether unit has a relatively low transition temperature to liquid crystal as well as good flow characteristics, and has thereby good melt-formability. The polyester gives melt extruded fibers and melt extruded films having superior mechanical strengths and elastic moduli, and also gives injection-molded products having superior strengths, excellent thermal characteristics, elastic moduli and impact strengths.
Inventors
- 👤 Mitsuo Matsumoto
- 👤 Teruhisa Kaneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
A wholly aromatic polyester consisting essentially of recurring units from the following I, II, III and IV ( at least a part of hydrogen atoms bonded to the ring may be substituted with substituting groups ): ##STR6## wherein the unit I is contained in the range from 30 to 80 mol%, the unit II is contained in the range from 10 to 35 mol%, the unit III is contained in the range from 2.5 to 25 mol%, the unit IV is contained in the range from 5 to 30 mol%, and the total mols of the unit III and unit IV is substantially the same as that of the unit II; said polyester having an inherent viscosity, when determined in pentafluorophenol solution at a concentration of 0.1 wt./vol% and at 60° C., of 0.5 dl/g or higher; and said polyester being capable of forming an optically anisotropic melt phase.
Claim 2
Dependent Claim
149 words
A wholly aromatic polyester consisting essentially of recurring units from the following I, II, III and IV ( at least a part of hydrogen atoms bonded to the ring may be substituted with substituting groups ): ##STR6## wherein the unit I is contained in the range from 30 to 80 mol%, the unit II is contained in the range from 10 to 35 mol%, the unit III is contained in the range from 2.5 to 25 mol%, the unit IV is contained in the range from 5 to 30 mol%, and the total mols of the unit III and unit IV is substantially the same as that of the unit II; said polyester having an inherent viscosity, when determined in pentafluorophenol solution at a concentration of 0.1 wt./vol% and at 60° C., of 0.5 dl/g or higher; and said polyester being capable of forming an optically anisotropic melt phase.
Claim 3
Dependent Claim
83 words
A wholly aromatic polyester as defined in claim 1, wherein the unit I is contained in the range from 40 to 70 mol%, the unit II is contained in the range from 15 to 30 mol%, the unit III is contained in the range from 3 to 20 mol%, the unit IV is contained in the range from 7 to 25 mol%, and the total mols of the unit III and unit IV is substantially the same as that of the unit II.
Claim 4
Dependent Claim
26 words
A wholly aromatic polyester as defined in claim 1, wherein aromatic rings contained in the recurring units from I, II, III and IV are not substituted.
Claim 5
Dependent Claim
57 words
A wholly aromatic polyester as defined in claim 1, wherein a part of hydrogen atoms bonded to each aromatic ring of the recurring unit I, II, III or IV have been substituted with an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen or a phenyl group, etc.
Claim 6
Dependent Claim
29 words
A wholly aromatic polyester as defined in claim 1, wherein said polyester is capable of forming an optically anisotropic melt phase at and below a temperature of 375° C.
Claim 7
Dependent Claim
29 words
A wholly aromatic polyester as defined in claim 1, wherein said polyester is capable of forming an optically anisotropic melt phase at and below a temperature of 350° C.
Claim 8
Dependent Claim
35 words
A wholly aromatic polyester as defined in claim 1, wherein said polyester has an inherent viscosity of 1.0 to 10 dl/g when determined in pentafluorophenol solution at a concentration of 0.1 wt./vol.% at 60° C.
Claim 9
Dependent Claim
35 words
A wholly aromatic polyester as defined in claim 1, wherein said polyester has an inherent viscosity of 1.25 to 7.5 dl/g when determined in pentafluorophenol solution at a concentration of 0.1 wt./vol.% at 60° C.
Claim 10
Dependent Claim
12 words
A formed product comprising a wholly aromatic polyester according to claim 1.
Claim 11
Dependent Claim
13 words
A film prepared by melt-extruding a wholly aromatic polyester according to claim 1.
Claim 12
Dependent Claim
15 words
A fiber prepared by melt-extruding and spinning a wholly aromatic polyester according to claim 1.
Claim 13
Dependent Claim
29 words
A composition comprising 100 weight parts of the wholly aromatic polyester according to claim 1, and about 10 to 600 weight parts of a filler and/or a reinforcing agent.
Claim 14
Dependent Claim
10 words
A formed product comprising a composition according to claim 12.
Claim 15
Dependent Claim
31 words
A sealing agent for electronics parts comprising 100 weight parts of the wholly aromatic polyester according to claim 1 and about 50 to 600 weight parts of a particulate inorganic material.
Claim 16
Dependent Claim
36 words
A sealing agent for electronics parts as defined in claim 14, wherein said particulate inorganic material has an average aspect ratio of 2 : 1 and an average particle size is about 1 to 50 μm.
Claim 17
Dependent Claim
19 words
A sealing agent for electronics parts as defined in claim 14, wherein said particulate inorganic material is fused silica.
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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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |