Patent US4837268A successfully refreshed from Google Patents.
US4837268A
Expired / Lapsed
US
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Wholly aromatic polyester
Assignee: Kuraray Co Ltd
•
Filing: 1987-12-18
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Granted: 1989-06-06
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Expires: 2007-12-18
Abstract
Abstract A molded product prepared by injection molding a wholly aromatic thermotropic liquid crystal polyester consisting of 4-oxybenzoil moiety, terephthaloyl moiety and 4,4'-dioxydiphenyl ether moiety is characterized in high impact strength, small mechanical anisotropy and excellent resistance to heat. The thermotropic liquid crystal polyester gives, by blending therewith a known thermotropic liquid crystal polyester, a composition which can yield a formed product having a superior strength and a relatively small elastic modulus.
Inventors
- 👤 Mitsuo Matsumoto
- 👤 Teruhisa Kaneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:07
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
145 words
A thermotropic liquid crystal polyester consisting essentially of recurring units from I, Ii and III, said recurring units being unsubstituted or each recurring unit being substituted with at least one substituent selected from the group consisting of C 1-4 alkyl groups, C 1-4 alkoxy groups and halogens: ##STR4## wherein the unit I is contained in the range from 45 to 68 mol %, the unit II is contained in the range from 16 to 27.5 mol %, the unit III is contained in the range from 16 to 27.5 mol %, and the unit II and the unit III exist in substantially the same amounts; said polyester having an inherent viscosity, when determined in pentafluorophenol solution with a concentration of 0.1 wt./vol % and at 60° C., of 0.5 dl/g or higher, and forming an optically anisotropic melt phase at a temperature below 350° C.
Claim 2
Dependent Claim
145 words
A thermotropic liquid crystal polyester consisting essentially of recurring units from I, Ii and III, said recurring units being unsubstituted or each recurring unit being substituted with at least one substituent selected from the group consisting of C 1-4 alkyl groups, C 1-4 alkoxy groups and halogens: ##STR4## wherein the unit I is contained in the range from 45 to 68 mol %, the unit II is contained in the range from 16 to 27.5 mol %, the unit III is contained in the range from 16 to 27.5 mol %, and the unit II and the unit III exist in substantially the same amounts; said polyester having an inherent viscosity, when determined in pentafluorophenol solution with a concentration of 0.1 wt./vol % and at 60° C., of 0.5 dl/g or higher, and forming an optically anisotropic melt phase at a temperature below 350° C.
Claim 3
Dependent Claim
54 words
A thermotropic liquid crystal polyester as defined in claim 1, wherein the unit I is contained in the range from 50 to 65 mol %, the unit II is contained in the range from 17.5 to 25 mol % and the unit III is contained in the range from 17.5 to 25 mol %.
Claim 4
Dependent Claim
26 words
A thermotropic liquid crystal polyester as defined in claim 1, wherein aromatic rings contained in the recurring units from I, II and III are not substituted.
Claim 5
Dependent Claim
68 words
A thermotropic liquid crystal polyester as defined in claim 1, wherein a part of hydrogen atoms bonded to each aromatic ring of the recurring unit I, II or III have been substituted with at least one or more of a substituting group selected from a group consisting of an alky group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and halogens.
Claim 6
Dependent Claim
37 words
A thermotropic liquid crystal polyester as defined in claim 1, wherein said polyester has an inhedrent viscosity of 1.0 to 10 dl/g when determined in pentafluorophenol solution with a concentration of 0.1 wt./vol. % at 60° C.
Claim 7
Dependent Claim
39 words
An injection-molded product characterized in that the injection molding of the thermotropic liquid crystal polyester as specified in claim 1 is conducted at a temperature above the temperature of transition of said polyester to an optically anisotropic melt phase.
Claim 8
Dependent Claim
61 words
An injection-molded product according to claim 6, characterized in that the thermotropic liquid crystal polyester as specified in claim 1 contains the recurring unit I in an amount of 50 to 65 mol %, the recurring unit II in an amount of 17.5 to 25 mol % and the recurring unit III in an amount of 17.5 to 25 mol %.
Claim 9
Dependent Claim
28 words
An injection-molded product according to claim 6, characterized in that the recurring units contained in the thermotropic liquid crystal polyester as specified in claim 1 are not substituted.
Claim 10
Dependent Claim
78 words
An injection-molded product according to claim 6, characterized in that in said thermotropic liquid crystal polyester as defined in claim 1 a part of hydrogen atoms bonded to each aromatic ring of the recurring unit I, II or III have been substituted with at least one or more of a substituting group selected from a group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and halogens.
Claim 11
Dependent Claim
44 words
An injection-molded product according to claim 6, characterized in that said thermotropic liquid crystal polyester as defined in claim 1 has an inherent viscosity of 1.0 to 10 dl/g when determined in pentafluorophenol solution with a concentration of 0.1 wt./vol. % at 60° C.
Claim 12
Dependent Claim
48 words
A polymeric composition prepared by melt-blending the wholly aromatic polyester (X) as defined in claim 1 with an aromatic polyester (Y) having components whose construction is not identical with that of (X) and being melt-formable at 450° C. or below, in an weight ratio of 90:10 to 10:90.
Claim 13
Dependent Claim
53 words
A polymeric composition as defined in claim 11, wherein (Y) is further specified as that when test specimens are obtained by injection-molding (X) and (Y) separately, the flexural strength and the flexural modulus of the specimen obtained from (Y) are at least 10% higher than those of the speciment obtained from (X) respectively.
Claim 14
Dependent Claim
24 words
A polymeric composition as specified in claim 11, characterized in that the aromatic polyester (Y) is capable of forming an optically anisotropic melt phase.
Claim 15
Dependent Claim
29 words
An injection molded product characterized in that the polymeric composition as defined in cliam 11 is injection-molded at a temperature higher than the temperature at which each component melts.
Claim 16
Dependent Claim
29 words
An injection molded product characterized in that the polymeric composition as defined in cliam 11 is injection-molded at a temperature higher than the temperature at which each component melts.
Claim 17
Dependent Claim
13 words
A fiber obtained by melt-spinning the polymeric composition as defined in claim 11.
Claim 18
Dependent Claim
13 words
A film obtained by melt-extruding the polymeric composition as defined in claim 11.
Claim 19
Dependent Claim
30 words
A composition comprising 100 weight parts of the thermotropic liquid crystal polyester according to claim 1 and about 10 to 600 weight parts of a filler and/or a reinforcing agent.
Claim 20
Dependent Claim
13 words
A molded product obtained by injection molding the composition according to claim 17.
Claim 21
Dependent Claim
28 words
A composition comprising 100 weight parts of the polymeric composition according to claim 11 and about 10 to 600 weight parts of a filler and/or a reinforcing agent.
Claim 22
Dependent Claim
13 words
A molded product obtained by injection molding the composition according to claim 19.
Claim 23
Dependent Claim
113 words
A thermotropic liquid crystal polyester consisting essentially of recurring units from I, II and III: ##STR5## wherein the unit I is contained in the range from 45 to 68 mol %, the unit II is contained in the range from 16 to 27.5 mol %, the unit III is contained in the range from 16 to 27.5 mol %, and the unit II and the unit III exist in substantially the same amounts; said polyester having an inherent viscosity, when determined in pentafluorophenol solution with a concentration of 0.1 weight/vol % and at 60° C., of 0.5 dl/g or higher, and forming an optically anisotropic melt phase at a temperature below 350° C.
Claim 24
Dependent Claim
113 words
A thermotropic liquid crystal polyester consisting essentially of recurring units from I, II and III: ##STR5## wherein the unit I is contained in the range from 45 to 68 mol %, the unit II is contained in the range from 16 to 27.5 mol %, the unit III is contained in the range from 16 to 27.5 mol %, and the unit II and the unit III exist in substantially the same amounts; said polyester having an inherent viscosity, when determined in pentafluorophenol solution with a concentration of 0.1 weight/vol % and at 60° C., of 0.5 dl/g or higher, and forming an optically anisotropic melt phase at a temperature below 350° C.
Claim 25
Dependent Claim
39 words
An injection-molded product characterized in that the injection molding of the thermotropic liquid crystal polyester as specified in claim 21 is conducted at a temperature above the temperature of transition from said polyester to an optically anisotropic melt phase.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |