CN1882633A - Component of signal reader and component of sensor - Google Patents
Component of signal reader and component of sensor Download PDFInfo
- Publication number
- CN1882633A CN1882633A CN200480033731.0A CN200480033731A CN1882633A CN 1882633 A CN1882633 A CN 1882633A CN 200480033731 A CN200480033731 A CN 200480033731A CN 1882633 A CN1882633 A CN 1882633A
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- Prior art keywords
- aromatic polyester
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- component
- signal reader
- component parts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/44—Polyester-amides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/19—Hydroxy compounds containing aromatic rings
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyesters Or Polycarbonates (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polyamides (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Gyroscopes (AREA)
Abstract
A resin material capable of sustaining a signal reading control stability suitable for a component of signal reader or sensor by exhibiting high resonant frequency characteristics while having high thermal stability. Components of signal reader and sensor are comprised of a wholly aromatic polyester resin and/or wholly aromatic polyesteramide resin which contains 2,6-naphthalene residues in an amount of 40 to 75 mol% and exhibits an optical anisotropy when melted.
Description
Technical field
The present invention relates to have high heat resistance, high resonant frequency characteristic, read the signal reader that forms by resin material of control stiffness or the component parts of transmitter to keep signal.
Background technology
In recent years signal reader, particularly the high capacity of dial drive unit process information, high speed are subjected to extensive concern.For example, the densification of the high power speedization of the disc spin speed of CD-ROM, the recorded information density popularized based on DVD etc. also have same trend at the signal reader of MD, the signal reader of hard disk etc.Owing to the dish of dial drive unit because of eccentric, face is uneven, rotational oscillation etc. produces vibration, so in order to read the information of dish, for example use under the situation of laser, should read the position relativity shift of information on the focus of laser apparatus and the dish, read error will take place.In order to prevent this situation, correction is caused side-play amount by vibration mechanism is set on signal reader in the past.Because the high speed of dial drive unit in recent years causes vibration to increase, the perhaps densification of the high frequencyization of oscillation frequency or information density just needs to improve the oscillatory extinction characteristic of signal reader or the high frequencyization of resonant frequency but as mentioned above.Like this, employed thermoplastic resin material just can not obtain stable reading performance on the classical signal reading device.
In recent years, the normal resin material that uses the full aromatic species liquid crystalline polymers that has high oscillatory extinction characteristic and have a high resonant frequency characteristic to be used as constituting signal reader.But then, signal reader is advancing compactization recently, particularly constitutes the parts such as bobbin of the electric wire winding of signal reader, the situation that useful resin is integrally formed.For to the logical electric current of going up of electric wire, just need strip off to be entangled in the electric wire terminal coating material (carbamate etc.) on the terminal and be connected on the electric power supply line.As the method for strip off coating material, often adopt the method for dipping tin soldering liquid or the method for manually welding etc., but in recent years, advancing the unleaded of scolding tin, and make scolding tin temperature high temperatureization.Therefore, much less resin terminal, even follow compactization of resin component under the situation of metal terminal, heat is easy to pass to resin component, so the resin component that can not melt, is out of shape just need have high heat resistance, the thermotolerance requirement more than 300 ℃ is arranged in recent years.Also have, manually in the method for welding, even also can be because of the different heat affecting differences to resin component of operator proficiency when low temperature welding, and the occasion of begining to learn operator produces bad problems such as a large amount of distortion.In view of above situation, the resin component that constitutes signal reader has advanced high heat-resistingization, but along with the problem that resonant frequency reduces has appearred in high heat-resistingization of resin portion.
Also have, also there are same problem in transmitter class, particularly angular-rate sensor etc., also require angular-rate sensor to have high damping.Angular-rate sensor is made of oscillating element and acceleration transducer, and oscillating element is vibrated with the frequency that surpasses 10kHz, detects by the acceleration transducer that the Coriolis force that is produced by rotation is gathered, and obtains circular frequency by calculation process.The shell of transmitter generally is made of resin, if when the natural oscillation number of the frequency of oscillating element and shell is consistent, can produce resonance, just can't correctly detect circular frequency, angular-rate sensor is applied to auto-navigation system, and as can not correctly detecting circular frequency, navigation feature will lose efficacy.Like this, must improve the natural mode shape of shell as much as possible.Also have, in transmitter, also be assembled with circuit, for welding, need it to have high heat resistance with the same reason of signal reader.
As the high frequency countermeasure of resonant frequency, the hillside plot of POWER society stretch will prison repair " the vibration engineering is crossed the threshold " lining mention, by improving
(below, this value is called the A value) improves resonant frequency.Like this,, generally, improve the resonant frequency of signal reader and transmitter, reach the wide areaization of vibration controlled frequency by selecting the bigger resin material of A value for use as the component parts of signal reader and transmitter.
On the other hand, in order to make heat-resistingization of Wholly aromatic liquid-crystalline polymerization object height that constitutes signal reader and sensor element, and change the monomer component ratio of resin, but the problem that resonant frequency reduces can appear in traditional method.For example, JP-A55-144024 proposes the polyester copolymerization that is made of the component unit (I) that imports from 2-hydroxyl-6 naphthoic acid, dicarboxylic acid unit (II), glycol unit (III), the component unit (IV) that imports from the 4-hydroxy-benzoic acid, and its each ratio that comprises component unit (I), (II), (III), (IV) is 20～40mol%, 5～30mol%, 5～30mol%, 10～50mol%.This polyester copolymerization improves the thermotolerance of resin by the ratio that reduces component unit (I), but opposite be that owing to reduced the ratio of component unit (I), the problem that resonant frequency reduces can appear in signal reader and transmitter.
For reaching high resonant frequency, the method that filled glass fiber or carbon fiber are also arranged, but the occasion of glass fibre, owing to must fill in a large number, the processability problems that injection forming is not only arranged, and the proportion of resin combination increases, so signal reader and transmitter itself can become weight, has the problem of responsiveness variation.In addition, the occasion of carbon fiber is owing to have electroconductibility, in the occasion of coil winding units such as bobbin, not only can't use, and also be subjected to bigger restriction because of the higher parts that it can use of the price of carbon fiber own, because cost is higher, the scope of its utilization just significantly is restricted.
Disclosure of an invention
The present invention forms for the problem that solves above-mentioned conventional art, and its purpose is to provide the resin material with high heat resistance, high resonant frequency characteristic, as the component parts of signal reader or transmitter, reads control stiffness to keep appropriate signal.
The inventor in order to achieve the above object, in the time of to relevant excellent heat resistance, liquid crystal polymer material with high resonant frequency characteristic is furtherd investigate, found that the monomer component ratio of full-aromatic polyester resin and/or the full-aromatic polyester amide resins ratio by special qualification is made up, just can effectively achieve the above object, thereby finish the present invention.
Promptly, the component parts of signal reader of the present invention or the component parts of transmitter, it is characterized in that: about full component unit, by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins form during fusion.
Also have, signal reader of the present invention comprises: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, the component parts that anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins form during fusion.
In addition, transmitter of the present invention comprises: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, the component parts that anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins form during fusion.
Perhaps, as the purposes of the component parts of the component parts of the signal reader of above-mentioned resin or transmitter.
The simple declaration of accompanying drawing
Fig. 1 represents the gate location that crooked elastic rate measurement used in the present invention is used with test piece and injection forming thereof.Fig. 2 represents the particular case that crooked elastic rate is measured among the present invention.Fig. 3 represents to be used among the present invention measure resonance frequency C D-ROM optical pickup.Fig. 4 represents the measurement chart of resonant frequency among a routine the present invention.
Preferred forms of the present invention
Below just the present invention elaborate.Component parts as signal reader of the present invention can be exemplified as: the lens supporting apparatus that keeps object lens; Under the situation of the focal position relativity shift of information on the dish and laser beam, become the contrast side-play amount and move the adjusting bobbin of object lens with the fuse of coil; The housing that supports each parts of optical pickup is an adjustment housings etc., but is not limited to this.Equally, as the component parts of transmitter, can be exemplified as the shell of transmitter etc., but be not limited to this.
As the judge index that improves resonant frequency above-mentioned A value is arranged.Though can judge when resonant frequency when 20kHz is above, do not have read error, can obtain stable performance, resonant frequency such as need are more than 20kHz, the A value must be greater than 120 (MPa
1/2).Also have, the measuring method of crooked elastic rate described here is considered actual service conditions, and is not suitable for adopting the general measuring method by ISO178, must measure by following method.It is test piece 130mm * 13mm * 0.8mm test piece as shown in Figure 1.Its cast gate number must use the test piece of injection forming, and have the measurement that weld seam just can not be correct in the test piece, so can only be one when the making test piece.Measure as shown in Figure 2, carry out under the state that freely supports at two ends, at the middle portion of test piece main shaft is set with spacing 20mm and carries out bending.The spindle speed of crooked test piece must carry out with the speed of the 100mm/min that is exceedingly fast.Because the phenomenon that oscillatory occurences is a speed to be exceedingly fast, so also must measure with the speed that is exceedingly fast like this to relevant crooked elastic rate.
Below just the liquid crystalline polymers that adopts of the present invention describe.Liquid crystalline polymers used in the present invention refers to the melt processable polymkeric substance that can form optical anisotropy fusion phase character.The character of anisotropy fusion phase can be confirmed by the polarisation inspection commonly used that utilizes the quadrature polarizer.More particularly, implement being confirmed to be of anisotropy fusion phase and utilize the Leitz polarizing microscope, the fusion test portion is placed on the hot Stage microscope of Leitz, under nitrogen atmosphere, observe and carry out with 40 times multiplying power.Be applicable to when liquid crystalline polymers of the present invention is checked between the quadrature polarizer, even polarisation also can see through usually under the fusion stationary state, the display optical anisotropy.Liquid crystalline polymers of the present invention is full-aromatic polyester or full-aromatic polyester acid amides.They preferably have at least about 2.0dl/g, if the logarithm viscosity (I.V.) of 2.0～10.0dl/g is then better when 60 ℃ are dissolved in Pentafluorophenol with 0.1 weight %.
As full-aromatic polyester that is applicable to liquid crystalline polymers of the present invention or full-aromatic polyester acid amides, most preferably from aromatic hydroxy carbonic acid, aromatic hydroxy amine, aromatic diamine group select at least a more than compound as the aromatic polyester, the aromatic polyester acid amides that constitute component.
About the full component unit of the used liquid crystalline polymers of the present invention, 2,6-naphthalene residue must be more than the 40mol% and below the 75mol%.If less than 40mol%, above-mentioned A value can be at 120 (MPa
1/2) below, resonant frequency can be reduced to below the 20kHz, can not carry out stable control.In addition, as surpassed 75mol%, the processing temperature of polymkeric substance can be too high, and being shaped with general injection molding technology can be very difficult, so preferably do not adopt.
Also have, the content of the 4-hydroxy-benzoic acid in the full liquid crystalline polymers in monomer component for being preferably in below the 8mol%.If the content of 4-hydroxy-benzoic acid is more than 8mol% in monomer component, then because with 2, the equilibrium relationship of 6-naphthalene residue, thermotolerance will reduce.
Full-aromatic polyester that the present invention is used or full-aromatic polyester acid amides, except to 2 in the liquid crystalline polymers, the ratio of 6-naphthalene residue has beyond the qualification, there is no particular limitation, the common monomer that is used for liquid crystalline polymers that can utilize those skilled in the art extensively to know is made by methods such as common polymerization, mixing, improvement.
Also have, at liquid crystalline polymers used in the present invention, in the scope that does not influence the object of the invention, can add the common additives such as Synergist S-421 95 that tinting materials such as demoulding modifying agent, dyestuff, pigment, carbon black, antioxidant, thermo-stabilizer, UV light absorber, charged preventor, interfacial agent, higher fatty acid, high-grade aliphatic ester, higher fatty acid metal-salt, fluorocarbons class interfacial agents etc. such as more than one needle-like reinforcement, inorganic/organic filler, fluorine resin or metallic soap class have the lubrication prescription effect.
In addition, at liquid crystalline polymers used in the present invention, in the scope that does not influence the object of the invention, can match with polycarbonate.
Do not limit in order to the fitting method of the feed composition that obtains liquid crystal polymer resin material of the present invention is special.Perhaps can will contain component, further as required each component such as reinforcements such as aluminium borate whisker, inorganic filler, demoulding modifying agent, thermo-stabilizer be supplied with the melting mixing machine individually, perhaps these feed composition can be utilized static mixer, mortar, Henschel mixer, ball mill, ribbon mixer etc. to resupply the melting mixing machine after the mixing in advance.In addition, liquid crystalline polymers and additive can also be supplied with granulating behind the fusion machine individually, under graininess, with its combination and mixing, the use level that must expire and want.
Liquid crystal polymer resin material of the present invention is suitable for the component parts of signal reader and transmitter, particularly the dial drive unit with parts, quartzy angular-rate sensor with parts etc.
Embodiment
Below, specify with regard to the present invention by embodiment, but the present invention is not limited thereto.Also have, the physical property among the embodiment is measured and test is carried out as follows:
(1) measurement of resonant frequency
To the location of CD-ROM optical pickup shown in Figure 3 magnetic circuit coil input white noise electrical signal, make the frequency of read head vibration and measurement tuning-points.Measure chart as shown in Figure 4.The frequency of 2 tuning-pointss in the survey sheet, if should the value more than 20kHz, then can judge no read error, and have stable reading performance, thus with 20kHz as judge index.
(2) measurement of crooked elastic rate
As mentioned above, consider actual service conditions, the measuring method of crooked elastic rate also is not suitable for adopting the measuring method of general ISO178, therefore with the 130mm * 13mm shown in Figure 1 * 0.8mm test piece (cast gate quantity is, and gate location is a test piece length direction terminal part as shown in Figure 1) that is shaped of the method for injection forming.Measure as shown in Figure 2, under the state that two ends are freely supported, at the test piece central part main shaft is set, carry out bending (spindle speed of crooked test piece is 100mm/min) by spacing 20mm.
(3) measurement of heat-drawn wire
Press ISO75/A, under measuring stress 1.8MPa, measure.
(4) service test of transmitter
Different with the resonant frequency measurement of above-mentioned CD-ROM optical pickup (Fig. 3), carry out the service test of auto navigation with angular transducer.
Reference example 1 (manufacturing of polymer A)
With 2-hydroxyl-6-naphthoic acid 116g, terephthalic acid 76g, 4,4-dihydroxybiphenyl 86g, 4-hydroxy-benzoic acid 5g, Potassium ethanoate 22.5mg, Glacial acetic acid 191g pack into possess stirrer, behind the aggregation container of reflux column, monomer input port, nitrogen introducing port, decompression/outflow line, the reactive system temperature is brought up to 140 ℃, 140 ℃ of reactions 1 hour.Thereafter, further be warming up to 360 ℃ through 5.5 hours, it is after be decompressed to 5Torr (being 667Pa) in 30 minutes, on one side condensing by-product acetic acid, superfluous Glacial acetic acid, other low component of boiling, carry out melt phase polycondensation on one side.After the stirring moment of torsion reaches prescribed value, import nitrogen, reach pressurized state from decompression state through normal pressure, discharge polymkeric substance by the aggregation container bottom, stranded granulation is made its granulating, just obtained polymer A.The 4-hydroxy-benzoic acid content of polymer A is 2mol% in the monomer, and fusing point is 352 ℃.
Reference example 2 (manufacturing of polymer B)
2-hydroxyl-6 naphthoic acid 226g, terephthalic acid 66g, 4-acetoxyl amino-phenol 60g, Potassium ethanoate 22.5mg, Glacial acetic acid 167g are packed into behind the aggregation container of reference example 1, the reactive system temperature is brought up to 140 ℃, 140 ℃ of reactions 1 hour., press reference example 1 same method polymerization, obtain polymer B thereafter.For not containing the 4-hydroxy-benzoic acid, fusing point is 280 ℃ to polymer B in monomer.
Reference example 3 (manufacturing of polymkeric substance C)
With 4-hydroxy-benzoic acid 184g, naphthoic acid 55g, m-phthalic acid 18g, 4,4-dihydroxybiphenyl 83g, Potassium ethanoate 22.5mg, Glacial acetic acid 231g pack into behind the aggregation container of reference example 1, the reactive system temperature are brought up to 140 ℃, 140 ℃ of reactions 1 hour., press reference example 1 same method polymerization, obtain polymkeric substance C thereafter.The 4-hydroxy-benzoic acid content of polymkeric substance C is 60mol% in the monomer, and fusing point is 335 ℃.
Reference example 4 (manufacturing of polymkeric substance D)
2-hydroxyl-6 naphthoic acid 114g, 4-hydroxy-benzoic acid 226g, Potassium ethanoate 22.5mg, Glacial acetic acid 234g are packed into behind the aggregation container of reference example 1, the reactive system temperature is brought up to 140 ℃, 140 ℃ of reactions 1 hour., press reference example 1 same method polymerization, obtain polymkeric substance D thereafter.The 4-hydroxy-benzoic acid content of polymkeric substance D is 73mol% in the monomer, and fusing point is 280 ℃.
Embodiment 1～2, comparative example 1～2
Each polymkeric substance that relative reference example 1～4 obtains (A, B, C, D) 70 weight fraction are added the glass fibre (Fibre diameter 10 μ m) of 30 weight fraction, after mixing with two extrusion machine fusions, carry out stranded cutting, make particle.This particle is made the used test piece of above-mentioned test with injection machine, and done evaluation.Its result is as shown in table 1:
Table 1
| Crooked elastic rate (MPa) | Proportion | A value (MPa 1/2) | Secondary resonant frequency (kHz) | Heat-drawn wire (℃) | |
| Embodiment 1 | 25520 | 1.62 | 125.5 | 20.5 | 335 |
| Embodiment 2 | 28792 | 1.61 | 133.7 | 21.8 | 240 |
| Reference example 1 | 21082 | 1.61 | 114.4 | 18.8 | 284 |
| Reference example 2 | 23475 | 1.62 | 119.7 | 19.7 | 240 |
Can be clear and definite from the result of table 1: adopt the liquid crystal polymer material of embodiment 1～2, can obtain resonant frequency few signal reader of read error when 20kHz is above.
And, the auto navigation that the liquid crystal polymer material that utilizes embodiment 1～2, comparative example 1～2 is made has carried out service test with angular transducer, under the situation of comparative example 1～2, read error has taken place and fail to carry out correct operation, but embodiment 1～2 o'clock its operation there is not the generation problem.
Claims (8)
1. the component parts of a signal reader is characterized in that: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins formation during fusion.
2. the component parts of signal reader as claimed in claim 1 is characterized in that: the 4-hydroxy-benzoic acid content during fusion in anisotropic full-aromatic polyester resin of display optical and/or the full-aromatic polyester amide resins by monomer component for below 8mol%.
3. the component parts of signal reader as claimed in claim 1 or 2, it is characterized in that: signal reader is the dial reading device.
4. the component parts of a transmitter is characterized in that: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins formation during fusion.
5. the component parts of transmitter as claimed in claim 4 is characterized in that: the 4-hydroxy-benzoic acid content during fusion in anisotropic full-aromatic polyester resin of display optical and/or the full-aromatic polyester amide resins by monomer component for below 8mol%.
6. as the component parts of claim 4 or 5 described transmitters, transmitter is an angular-rate sensor.
7. signal reader, comprising: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, the component parts that anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins form during fusion.
8. transmitter, comprising: by containing 2 more than the 40mol% and below the 75mol%, 6-naphthalene residue, the component parts that anisotropic full-aromatic polyester resin of display optical and/or full-aromatic polyester amide resins form during fusion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP390389/2003 | 2003-11-20 | ||
| JP2003390389A JP2005158085A (en) | 2003-11-20 | 2003-11-20 | Component of signal reading device, and component of sensor |
| PCT/JP2004/017433 WO2005049690A1 (en) | 2003-11-20 | 2004-11-17 | Component of signal reader and component of sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1882633A true CN1882633A (en) | 2006-12-20 |
| CN100594218C CN100594218C (en) | 2010-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480033731.0A Expired - Fee Related CN100594218C (en) | 2003-11-20 | 2004-11-17 | Component of signal reader and component of sensor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2005158085A (en) |
| CN (1) | CN100594218C (en) |
| TW (1) | TW200521183A (en) |
| WO (1) | WO2005049690A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5032957B2 (en) * | 2007-11-28 | 2012-09-26 | ポリプラスチックス株式会社 | Totally aromatic polyester and polyester resin composition |
| JP5155769B2 (en) * | 2008-08-07 | 2013-03-06 | ポリプラスチックス株式会社 | Totally aromatic polyester and polyester resin composition |
| JP2011042740A (en) * | 2009-08-21 | 2011-03-03 | Sumitomo Chemical Co Ltd | Light-resistant member |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2544731B2 (en) * | 1987-01-05 | 1996-10-16 | 株式会社クラレ | Wholly aromatic polyester |
| JPH02151626A (en) * | 1988-12-03 | 1990-06-11 | Agency Of Ind Science & Technol | Thermotropic, wholly aromatic polyester |
| JP2771833B2 (en) * | 1989-03-13 | 1998-07-02 | ポリプラスチックス株式会社 | Wholly aromatic polyester and composition thereof |
| JP2003268089A (en) * | 2002-03-13 | 2003-09-25 | Toray Ind Inc | Liquid crystalline polyester resin for molded product and molded circuit board |
-
2003
- 2003-11-20 JP JP2003390389A patent/JP2005158085A/en active Pending
-
2004
- 2004-11-17 CN CN200480033731.0A patent/CN100594218C/en not_active Expired - Fee Related
- 2004-11-17 TW TW93135171A patent/TW200521183A/en unknown
- 2004-11-17 WO PCT/JP2004/017433 patent/WO2005049690A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN100594218C (en) | 2010-03-17 |
| TW200521183A (en) | 2005-07-01 |
| WO2005049690A1 (en) | 2005-06-02 |
| JP2005158085A (en) | 2005-06-16 |
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Granted publication date: 20100317 Termination date: 20131117 |