WO2004035653A1 - パーフルオロポリエーテルエステル化合物、潤滑剤及び磁気記録媒体 - Google Patents
パーフルオロポリエーテルエステル化合物、潤滑剤及び磁気記録媒体 Download PDFInfo
- Publication number
- WO2004035653A1 WO2004035653A1 PCT/JP2003/013246 JP0313246W WO2004035653A1 WO 2004035653 A1 WO2004035653 A1 WO 2004035653A1 JP 0313246 W JP0313246 W JP 0313246W WO 2004035653 A1 WO2004035653 A1 WO 2004035653A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- perfluoropolyether
- formula
- ocf
- ester
- lubricant
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/72—Protective coatings, e.g. anti-static or antifriction
- G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
- G11B5/7253—Fluorocarbon lubricant
- G11B5/7257—Perfluoropolyether lubricant
-
- 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
-
- 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
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—Dicarboxylic acids and dihydroxy compounds
-
- 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
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/682—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens
-
- 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
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/682—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens
- C08G63/6824—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/6826—Dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/38—Lubricating compositions characterised by the base-material being a macromolecular compound containing halogen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/0606—Perfluoro polymers used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/18—Electric or magnetic purposes in connection with recordings on magnetic tape or disc
Definitions
- the present invention relates to a novel perfluoropolyether ester compound useful as a lubricant, a lubricant using the same, and a recording medium.
- a lubricant is applied to the surface of the hard disk because the magnetic head contacts the hard disk.
- a lubricant include perfluoropolyether diol having hydroxyl groups at both ends (Z-DOL, Audimont) and perfluoropolyether dicarboxylic acid having carboxyl groups at both ends (Z-DIAC, Further, perfluoropolyethertetraol (Z-TETRA ⁇ L, Audimont) having propylene glycol residues at both ends is known.
- next-generation compact hard disk drives for magnetic recording capable of high-density recording are expected to be mounted in passenger cars where the indoor temperature is relatively high, so higher heat resistance is required.
- lubricants applied to the outermost surface of the hard disk are required to have heat resistance of 300 ° C. or more.
- the decomposition temperature is about 270 ° C. at most, and disappears.
- the temperature is at most about 450 ° C, and there is a problem that the required properties of heat resistance of 300 ° C or more cannot be satisfied. Also, in the case of the perfluoropolyether ester compound described in Patent Document 1, the decomposition temperature is only about 280 ° C at most, and it is possible to satisfy the required property of heat resistance of 300 ° C or more. There was a problem that it was not possible.
- An object of the present invention is to solve the above-mentioned problems of the prior art, and a novel perfluoro-portion polyether derivative useful as a lubricant having a decomposition temperature of 300 ° C or more is industrially produced.
- the goal is to make it easy to provide. Disclosure of the invention
- a compound in which at least two perfluoropolyether residues are bonded by an ester bond is a novel compound having a decomposition temperature of 300 ° C or higher. Completed the invention.
- the present invention relates to a perfluoropolyether diol having a hydroxyl group at both ends represented by the formula (1) and a perfluoropolyether diol represented by the formula (2) Disclosed is a novel perfluoropolyether ester compound having at least one ester bond, which is obtained by an esterification reaction with a perfluoropolyether dicarboxylic acid having a boxyl group.
- R and R ′ are each independently the following perfluoroether groups R 1 to R 4
- the present invention provides a lubricant containing the novel perfluoropolyether ester compound.
- the present invention provides a magnetic recording medium having at least a magnetic layer formed on a nonmagnetic support, wherein a coating film of a lubricant containing the above-described novel perfluoropolyetherester compound is formed on the surface of the magnetic layer.
- a magnetic recording medium characterized by being formed.
- FIG. 1 is an IR chart of the perfluoropolyether diol of the formula (1) used in Example 1.
- FIG. 2 is an I: R chart of the perfluoropolyether dicarboxylic acid of the formula (2) used in Example 1.
- FIG. 3 shows the perfluoropolyetheresterification obtained in Example 1. It is an IR chart of the compound.
- FIG. 4 is an IR chart of the perfluoropolyether dicarboxylic acid of the formula (2) used in Example 2.
- FIG. 5 is an IR chart of the perfluoropolyether ester compound obtained in Example 2.
- the present invention relates to a method for producing a perfluoropolyetherdiol having hydroxyl groups at both ends and a perfluoropolyetherdicarboxylic acid having a carboxyl group at both ends by esterification reaction.
- Both are novel perfluoropolyether ester compounds having one ester bond.
- the perfluoropolyether diol having hydroxyl groups at both ends is represented by the following formula (1):
- the perfluoropolyether dicarboxylic acid having a carboxyl group at both ends is a compound represented by the following formula (2).
- R and R ′ are each independently the following perfluoroether group R R
- R 1 — (OCF 2 ) n — OCF 2-
- R 2 -(CF 2 0) j- (CF 2 CF 2 0) k- (CF 2 0) 1 -CF
- -R 3 One (CF 2 CF 2 CF 2 O).
- CF 2 CF 2 -R 4 any one of substituents selected from-(CF 2 CF (CF 3 ) 0) p -CF 2- .
- m, n, j, k, 1 , O and p are each independently an integer from 1 to 100.
- novel perfluoropolyether ester compound of the present invention is not particularly limited in the number of ester bonds, but preferably has one or two esterol bonds from the viewpoint of stability. And those having the following chemical structural formulas (3) to (5), in which a perfluoropolyether residue is bonded to both sides, respectively.
- the weight average molecular weights of the perfluoropolyether diol of the formula (1) and the perfluoropolyether dicarboxylic acid of the formula (2) are as follows. If it is too small, the heat resistance temperature of the product will be low, and if it is too large, the reactivity will decrease. Each is preferably from 1500 to 400, more preferably from 180 to 380.
- the perfluoropolyether ester compound of the present invention comprises a perfluoropolyether diol of the formula (1) and a perfluoropolyether dicarboxylic acid of the formula (2) in a solvent (for example, PF Water generated in the presence of an esterification catalyst such as p-toluenesulfonic acid in 508 (Sumitomo 3LEM), FC 77 (Sumitomo 3LEM) and Pertrel XF (Mitsui Dupont Fluorochemicals) It can be manufactured by heating and stirring while removing the slag.
- PF Water for example, PF Water generated in the presence of an esterification catalyst such as p-toluenesulfonic acid in 508 (Sumitomo 3LEM), FC 77 (Sumitomo 3LEM) and Pertrel XF (Mitsui Dupont Fluorochemicals) It can be manufactured by heating and stirring while removing the slag.
- the perfluoropolyetherdiol of the formula (1) and the perfluoropolyetherdicarboxylic acid of the formula (2) are heated and stirred at a temperature of 100 to 180 ° C without solvent. It is preferable to produce it by an industrially simple pulp polymerization method of esterification. When manufactured by the park polymerization method, it can be used as a lubricant without industrially performing purification operations such as recrystallization.
- novel perfluoropolyether ester compound of the present invention described above is useful as a lubricant having a decomposition temperature of 300 ° C. or higher and having excellent heat resistance.
- the lubricant may be composed of only the perfluoro opening polyether ester compound. Accordingly, additives such as an extreme pressure agent and an antioxidant can be appropriately added.
- the lubricant containing the novel perfluoropolyether ester compound of the present invention can be preferably used for surface coating of a magnetic recording medium. Therefore, a magnetic recording medium treated with a lubricant containing the novel perfluoropolyether ester compound of the present invention has at least a magnetic layer formed on a non-magnetic support, Layer of the present invention on the surface of the layer It has a structure in which a coating film of a lubricant containing a regular perfluoropolyether ester compound and having excellent heat resistance is formed. For this reason, such a magnetic recording medium is particularly useful as a hard disk of a magnetic recording hard disk device.
- Example 1 As the nonmagnetic support and the magnetic layer constituting the magnetic recording medium, the same configuration as the conventionally known nonmagnetic support and the magnetic layer constituting the magnetic recording medium can be employed.
- Example 2 As the nonmagnetic support and the magnetic layer constituting the magnetic recording medium, the same configuration as the conventionally known nonmagnetic support and the magnetic layer constituting the magnetic recording medium can be employed.
- perfluoropolyether terdicarboxylic acid of the formula (2) (Z-DIAC 400, Audimont) is carried out, and the polymer side is fractionated to obtain a weight average molecular weight of 7100.
- a perfluoropolyether dicarboxylic acid compound having no ester bond in the molecule was obtained.
- a perfluoropolyetherester compound having one ester bond and having the above-mentioned chemical structural formula (3) (weight average molecular weight: 3800) was obtained.
- the specific structural formula of the obtained perfluoropolyether ester compound is as follows, and its IR chart is shown in FIG.
- the perfluoropolyether dicarboxylic acid of the formula (2) having no ester bond in the molecule was used as it was (weight-average molecular weight: 3800).
- Example 1-2 The decomposition temperature and disappearance temperature of the perfluoro-mouthed polyether derivative obtained in Example 1-2 and Comparative Example 1-3 were measured in accordance with JISKOI29. Table 1 shows the obtained results.
- the decomposition temperature of the monofluoropolyether ester compound is improved compared to the perfluoropolyether derivative having no ester group and having the same molecular weight (Comparative Examples 1 and 2).
- Example 1 380 ° CZ Comparative Example 1: 330 ° C.
- Example 2 380 ° CZ Comparative Example 2: 270 ° C.
- Example 1 and Example 2 show that the presence of the ester group lowers the molecular weight dependence of the decomposition temperature. (No significant change in solution temperature). This is a completely different finding from the results of Comparative Example 1 and Comparative Example 2 that in the case of perfluoropolyether derivative having no ester group, the decomposition temperature rises as the weight average molecular weight increases. It is.
- the decomposition temperature can be increased without increasing the weight average molecular weight. You can see.
- Decomposition temperature is as low as 280 ° C. This indicates that the introduction of perfluoropolyether residues on both sides of the ester bond is effective for raising the decomposition temperature.
- the disappearance temperature was 500 ° C. in Examples 1 and 2 in which a perfluoropolyether residue was present on both sides of the ester bond, and 45 ° C. in other Comparative Examples 1 to 3. It is 0. Therefore, it can be seen that it is effective to introduce a perfluoro-opening polyether residue on both sides of the ester bond in order to increase the disappearance temperature.
- the novel perfluoropolyether ester compound of the present invention is an esterification reaction of perfluoropolyether diol having a hydroxyl group at both terminals and perfluoropolyether dicarboxylic acid having a carboxyl group at both terminals. Since it is a compound having one or more ester bonds, the decomposition temperature is 300 ° C. or higher, and it is useful as a heat-resistant lubricant.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Lubricants (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Magnetic Record Carriers (AREA)
- Polyesters Or Polycarbonates (AREA)
- Polyethers (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020057006555A KR100650476B1 (ko) | 2002-10-18 | 2003-10-16 | 퍼플루오로폴리에테르 에스테르 화합물, 윤활제 및 자기기록 매체 |
CNB2003801014730A CN100396710C (zh) | 2002-10-18 | 2003-10-16 | 全氟聚醚酯化合物、润滑剂和磁记录介质 |
US10/518,717 US7157410B2 (en) | 2002-10-18 | 2003-10-16 | Perfluoropolyether ester compound, lubricant and magnetic recording medium |
EP03756649A EP1561767A4 (en) | 2002-10-18 | 2003-10-16 | PERFLUOROPOLYETHER ESTER COMPOUND, LUBRICANT, AND MAGNETIC RECORDING MEDIUM |
AU2003301419A AU2003301419A1 (en) | 2002-10-18 | 2003-10-16 | Perfluoropolyether ester compound, lubricant and magnetic recording medium |
HK06104322.5A HK1084138A1 (en) | 2002-10-18 | 2006-04-10 | Perfluoropolyether ester compound, lubricant and magnetic recording medium |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-304173 | 2002-10-18 | ||
JP2002304173 | 2002-10-18 | ||
JP2003354600A JP4013881B2 (ja) | 2002-10-18 | 2003-10-15 | パーフルオロポリエーテルエステル化合物、潤滑剤及び磁気記録媒体 |
JP2003-354600 | 2003-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004035653A1 true WO2004035653A1 (ja) | 2004-04-29 |
Family
ID=32109480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/013246 WO2004035653A1 (ja) | 2002-10-18 | 2003-10-16 | パーフルオロポリエーテルエステル化合物、潤滑剤及び磁気記録媒体 |
Country Status (9)
Country | Link |
---|---|
US (1) | US7157410B2 (ja) |
EP (1) | EP1561767A4 (ja) |
JP (1) | JP4013881B2 (ja) |
KR (1) | KR100650476B1 (ja) |
CN (1) | CN100396710C (ja) |
AU (1) | AU2003301419A1 (ja) |
HK (1) | HK1084138A1 (ja) |
TW (1) | TWI225866B (ja) |
WO (1) | WO2004035653A1 (ja) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5250937B2 (ja) * | 2006-02-28 | 2013-07-31 | 富士通株式会社 | 潤滑剤、磁気記録媒体およびヘッドスライダ |
JP2007292221A (ja) | 2006-04-26 | 2007-11-08 | Fujitsu Ltd | 構造体および記録媒体駆動装置並びに潤滑膜付きねじ |
US7998913B2 (en) * | 2007-06-11 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Flow modifiers for improved magnetic recording device |
CN101139434B (zh) * | 2007-09-30 | 2011-06-22 | 大连理工大学 | 具有低表面能的含氟聚酯及其制备方法 |
WO2010130625A1 (en) * | 2009-05-15 | 2010-11-18 | Solvay Solexis S.P.A. | Process for the purification of polyol pfpe derivatives |
CN103145969B (zh) * | 2013-03-15 | 2014-11-26 | 湖南有色郴州氟化学有限公司 | 全氟聚醚二醇、聚酯聚醚嵌段共聚物 |
CN103469338B (zh) * | 2013-09-26 | 2015-12-23 | 江苏立新化纤科技有限公司 | 一种氟聚酯poy纤维的制备方法 |
CN103469335B (zh) * | 2013-09-26 | 2016-03-16 | 江苏立新化纤科技有限公司 | 一种氟聚酯高强耐磨工业丝及其制备方法 |
CN103469357B (zh) * | 2013-09-26 | 2016-01-27 | 江苏立新化纤科技有限公司 | 一种含氟ptt-pet共混纤维的制备方法 |
CN103469334B (zh) * | 2013-09-26 | 2015-12-09 | 江苏立新化纤科技有限公司 | 一种含氟pbt聚酯poy纤维的制备方法 |
CN103469336B (zh) * | 2013-09-26 | 2016-04-13 | 江苏立新化纤科技有限公司 | 一种含氟ptt聚酯poy纤维的制备方法 |
CN103469355B (zh) * | 2013-09-26 | 2016-01-27 | 江苏立新化纤科技有限公司 | 一种含氟pet-pet共混纤维的制备方法 |
CN103469337B (zh) * | 2013-09-26 | 2017-01-11 | 江苏立新化纤科技有限公司 | 一种含氟无规共聚酯poy纤维的制备方法 |
CN103469339B (zh) * | 2013-09-26 | 2016-02-10 | 江苏立新化纤科技有限公司 | 一种氟聚酯dty纤维的制备方法 |
CN103469350B (zh) * | 2013-09-26 | 2016-01-20 | 江苏立新化纤科技有限公司 | 一种氟聚酯fdy纤维的制备方法 |
CN103469356B (zh) * | 2013-09-26 | 2016-01-27 | 江苏立新化纤科技有限公司 | 一种含氟pet-pet皮芯复合纤维的制备方法 |
CN103469361B (zh) * | 2013-09-26 | 2016-01-27 | 江苏立新化纤科技有限公司 | 一种含氟pbt-pet共混纤维的制备方法 |
CN105575408A (zh) * | 2015-12-08 | 2016-05-11 | 衢州氟硅技术研究院 | 一种用于磁盘的润滑油组合物 |
CN108239509B (zh) * | 2016-12-23 | 2021-01-01 | 上海理日化工新材料有限公司 | 具有良好耐热性的聚醚酯热熔胶及其制备方法 |
US11639330B2 (en) | 2017-08-21 | 2023-05-02 | Showa Denko K.K. | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
JP7447903B2 (ja) * | 2019-07-31 | 2024-03-12 | 株式会社レゾナック | 含フッ素エーテル化合物、磁気記録媒体用潤滑剤および磁気記録媒体 |
US11879109B2 (en) | 2019-09-18 | 2024-01-23 | Resonac Corporation | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
CN114845989B (zh) | 2019-12-26 | 2024-09-10 | 株式会社力森诺科 | 含氟醚化合物、磁记录介质用润滑剂及磁记录介质 |
CN115038685A (zh) | 2020-02-07 | 2022-09-09 | 昭和电工株式会社 | 含氟醚化合物、磁记录介质用润滑剂及磁记录介质 |
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EP0338529A2 (en) * | 1988-04-19 | 1989-10-25 | Daikin Industries, Limited | Fluorine-containing polyether and lubricant comprising the same |
JPH0249218A (ja) * | 1988-05-31 | 1990-02-19 | Sony Corp | 磁気記録媒体 |
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-
2003
- 2003-10-15 JP JP2003354600A patent/JP4013881B2/ja not_active Expired - Fee Related
- 2003-10-16 AU AU2003301419A patent/AU2003301419A1/en not_active Abandoned
- 2003-10-16 EP EP03756649A patent/EP1561767A4/en not_active Withdrawn
- 2003-10-16 CN CNB2003801014730A patent/CN100396710C/zh not_active Expired - Fee Related
- 2003-10-16 US US10/518,717 patent/US7157410B2/en not_active Expired - Fee Related
- 2003-10-16 TW TW092128672A patent/TWI225866B/zh not_active IP Right Cessation
- 2003-10-16 KR KR1020057006555A patent/KR100650476B1/ko not_active IP Right Cessation
- 2003-10-16 WO PCT/JP2003/013246 patent/WO2004035653A1/ja active Application Filing
-
2006
- 2006-04-10 HK HK06104322.5A patent/HK1084138A1/xx not_active IP Right Cessation
Patent Citations (2)
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EP0338529A2 (en) * | 1988-04-19 | 1989-10-25 | Daikin Industries, Limited | Fluorine-containing polyether and lubricant comprising the same |
JPH0249218A (ja) * | 1988-05-31 | 1990-02-19 | Sony Corp | 磁気記録媒体 |
Non-Patent Citations (1)
Title |
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See also references of EP1561767A4 * |
Also Published As
Publication number | Publication date |
---|---|
TWI225866B (en) | 2005-01-01 |
EP1561767A4 (en) | 2009-08-26 |
HK1084138A1 (en) | 2006-07-21 |
KR100650476B1 (ko) | 2006-11-30 |
EP1561767A1 (en) | 2005-08-10 |
JP2004156028A (ja) | 2004-06-03 |
CN1705698A (zh) | 2005-12-07 |
JP4013881B2 (ja) | 2007-11-28 |
AU2003301419A1 (en) | 2004-05-04 |
CN100396710C (zh) | 2008-06-25 |
US7157410B2 (en) | 2007-01-02 |
US20050209480A1 (en) | 2005-09-22 |
TW200407353A (en) | 2004-05-16 |
KR20050062620A (ko) | 2005-06-23 |
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