WO2005116137A1 - ポリオキシメチレン樹脂製ハードディスクドライブ用ランプ - Google Patents
ポリオキシメチレン樹脂製ハードディスクドライブ用ランプ Download PDFInfo
- Publication number
- WO2005116137A1 WO2005116137A1 PCT/JP2005/009889 JP2005009889W WO2005116137A1 WO 2005116137 A1 WO2005116137 A1 WO 2005116137A1 JP 2005009889 W JP2005009889 W JP 2005009889W WO 2005116137 A1 WO2005116137 A1 WO 2005116137A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hard disk
- disk drive
- lamp
- less
- polyoxymethylene resin
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
- G11B21/22—Supporting the heads; Supporting the sockets for plug-in heads while the head is out of operative position
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
- C08L59/04—Copolyoxymethylenes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
- B29C2071/0027—Removing undesirable residual components, e.g. solvents, unreacted monomers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
- B29C2071/0036—Extracting, degassing, removing gases from moulded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2059/00—Use of polyacetals, e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
Definitions
- Hard disk drive lamp made of polyoxymethylene resin
- the present invention relates to a polyoxymethylene resin lamp for a hard disk drive. More specifically, the present invention relates to a lamp for a hard disk drive in which outgassing and harmful components are reduced by making use of the excellent friction and wear performance of polyoxymethylene resin.
- Polyoxymethylene resin is widely used as an engineering resin having balanced mechanical properties and excellent friction and wear performance in various mechanical parts, OA equipment, and the like.
- a synthetic resin such as polyoxymethylene is suitable as a material of the lamp.
- Patent Document 3 discloses lamp materials such as 4-hydroxybenzoic acid and 6-hydroxy-12-naphthoic acid copolyester (HAHN), polyoxymethylene, and polyetheretherketone.
- Patent Document 4 describes polyimide, polyoxymethylene, PEEK, HAHN, a liquid crystalline polymer and PTFE-filled plastic as lamp unit materials.
- Patent Document 5 discloses the use of a material having a tensile elongation of 30% or more as a lamp material, and specifically discloses a polyoxymethylene resin.
- Patent document 6 filed by the present applicant discloses a lamp for a hard disk made of a polyoxymethylene resin and a polymer lubricant.
- seal materials and gasket materials used in hard disk devices are designed to prevent contamination of the magnetic or optical disks inside the devices, so that gas (such as blue, bromine, and chlorine) is not used.
- gases such as blue, bromine, and chlorine
- Materials that generate less corrosive gas, siloxane, organic gas such as olefins) are required.
- Lamp materials are one-hundredth to several hundredths in weight ratio compared to seal materials, but considering the miniaturization and high integration of HDDs, it is essential that materials with low outgassing and corrosive gas be required. Seem.
- Patent document 1 JP-A-10-064205 (US6151190A)
- Patent Document 2 JP-A-10-125014 (without family)
- Patent Document 3 JP-A-11-339411 (no family)
- Patent Document 4 JP 2001-23325 A
- Patent Document 5 Japanese Patent Application Laid-Open No. 2001-297548 (US2001 / 0040769A1)
- Patent Document 6 WO 03-0555945
- Patent Document 7 JP-A-09-316255
- Patent Document 8 JP-A-2002-265681
- Patent Document 9 JP-A-2000-71241 (without family)
- the present invention has been made under the above circumstances, and has as its object to reduce outgas and harmful components of a polyoxymethylene resin hard disk drive lamp.
- the present inventors have conducted various studies with the aim of reducing the outgassing and harmful components of a polyoxymethylene resin lamp containing a colorant, and as a result, the following processing method was carried out. And accomplished the present invention.
- the present invention is as follows.
- the harmful component obtained by using a coloring agent having a low content of the harmful component in the melt-kneading step is 0.3 zg / g or less, any of (2) to (9).
- the polyoxymethylene resin used in the present invention is obtained by polymerizing cyclic oligomers such as honolemaldehyde or its trimer trioxane or tetramer tetraoxane, and blocking both ends of the polymer with ether or ester groups.
- cyclic oligomers such as honolemaldehyde or its trimer trioxane or tetramer tetraoxane, and blocking both ends of the polymer with ether or ester groups.
- the Okishiarukiren units having 2 to 8 carbon atoms which is obtained by polymerizing, O alkoxy methylene copolymer containing 0.:! ⁇ 20 mole 0/0; those having a branched molecular chain further; and , 50% by weight or more of segments composed of oxymethylene units and 50% by weight or less of heterogeneous segments It is at least one selected O carboxymethyl methylene block polymer or et containing.
- the oxymethylene block polymer include a block polymer of a polyalkylene glycol and a polyoxymethylene homopolymer disclosed in JP-A-57-31918, and a hydrogenated polybutadiene disclosed in Japanese Patent Application No. 11-216654. And oxymethylene copolymer block polymers.
- polyoxymethylene resins can be properly used depending on the purpose. From the viewpoint of slidability and rigidity, it is preferable to use a homopolymer / copolymer with a small amount of comonomer. From the viewpoint of thermal stability and impact resistance, it is preferable to use a copolymer having a large amount of comonomer or a block polymer of hydrogenated polybutadiene and oxymethylene copolymer. For the use of the present invention, a copolymer having a small amount of comonomer is most preferable from the balance between the slidability and the thermal stability.
- the melt flow rate (measured under the conditions of ASTM-D1238-57T) of the polyoxymethylene resin used in the present invention is from 0.5 g / 10 min to 100 g / 10 min, preferably from 1.0 Og / 10 min to 80 g / 10 min. More preferably, the range is from 5 g / 10 min to 60 g / 10 min, and most preferably from 7 g / 10 min to 50 g / 10 min. If it is 0.5 g / 10 min or more, the moldability is excellent, and if it is less than 100 g / 10 min, the durability is sufficient.
- stabilizers used in conventional polyoxymethylene resins for example, heat stabilizers, weather (light) stabilizers, etc. may be used alone or in combination. Can be done. Specifically, it is described in WO01-032775. Stabilizers can be used.
- a preferred combination of stabilizers for the polyoxymethylene resin of the present invention is "hind phenol (especially triethylene glycol-bis- (3_ (3_t_butyl_5-methyl-1--4-hydroxyphenyl) -propionate)"). , Tetrakis (methylene_3_ (3 ', 5'-di_t_butyl-14'-hydroxyphenyl) propionatemethane)), "polymers containing formaldehyde-reactive nitrogen (especially polyamide resins, Poly- ⁇ -alanine) ”and, if necessary,“ alkaline earth metal fatty acid salts (especially fatty acid calcium salts) ”.
- the amount of addition is 0.05 to 0.5% by weight of "hindered phenol”, 0.01 to 0.5% by weight of "polymer containing formaldehyde reactive nitrogen”, and 0.1 to 0.5% by weight of polyoxymethylene resin.
- “fatty acid salt of alkaline earth metal (especially fatty acid calcium salt)” is in the range of 0.01 to 0.5% by weight.
- the colorant used in the present invention is at least one selected from organic and inorganic pigments and / or dyes.
- organic and inorganic pigments include, for example, metals represented by zinc oxide, titanium oxide and titanium yellow (Ti, Cr, Sb, Ni, Zn, Fe, Co, Al and Complex oxides selected from Cu), iron oxide, ultramarine, cobalt blue, calcined pigments, carbon black, acetylene black, lamp black and the like.
- the above-mentioned inorganic pigment also includes a fine particle inorganic filler.
- a fine particle inorganic filler for example, silica, quartz powder, aluminum silicate, kaolin, talc, clay, diatomaceous earth, nephrin sinite, cristobalite, wollastonite (calcium silicate), alumina, calcium sulfate, barium sulfate, calcium carbonate, magnesium carbonate, dolomite , Calcium phosphate, hydroxyapatite, my power, ultrafine carbon such as conductive carbon black and carbon nanotubes, and various metal powders.
- These inorganic pigments and fillers generally have a particle diameter of 10 ⁇ m or less, preferably 5 ⁇ m or less, more preferably 3 xm or less, and still more preferably lxm or less.
- These inorganic pigments and fine-particle inorganic fillers may be treated with a dispersant or a surface treating agent as long as they do not affect the hard disk drive lamp of the present invention.
- the organic pigment include monoazo, condensed azo, phthalocyanine, anthraquinone, perinone, quinacdrine, dioxazine, isoindoline, quinaphthalone, and isoindolin-based pigments.
- titanium oxide metal composite oxide, iron oxide, carbon black, calcium carbonate, wollastonite, and ultrafine carbon are preferred.
- the harmful substances in the colorant of the present invention include halogen, halogen-containing aliphatic / aromatic compounds, siloxane, silicone compounds, thio compounds, phthalic acid and phthalic esters, acrylic acid and acrylates , Phosphoric acid, organotin, etc. are substances that cause corrosion and poor contact with hard disk drive devices.
- the outgas of the present invention is a volatile component containing the above-mentioned harmful substances, and components other than the harmful substances include, for example, aliphatic / aromatic hydrocarbons, alcohols, ethers, oxygen-containing compounds such as esters, formaldehyde, and the like. And its cyclic compounds. These non-hazardous outgasses can condense between the head / disk interface; and diffuse across the disk surface, causing sticking problems.
- the polyoxymethylene resin of the present invention includes a polyolefin resin shown in WO 03-0555945, a polymer obtained by polymerizing a polyether and an isocyanate M conjugate, and Japanese Patent Application No. 2004-244024.
- the hard disk lamp of the present invention is obtained by performing the following treatment method on the above polyoxymethylene resin.
- the polyoxymethylene resin which generates a small amount of outgas can be obtained by degassing from one or more vents at the time of melt-kneading using a vented extruder, preferably by using a twin-screw extruder.
- the L / D of the extruder is preferably about 25 to 50, more preferably 30 to 50.
- the degree of decompression is required to be not more than 1.0 MPa, preferably not more than 0.07 MPa, more preferably not more than 0.08 MPa, particularly preferably not more than 1.0 MPa.
- the polyoxymethylene resin of the present invention can further reduce the outgas by controlling the amount of chloride ions adhering to the surface to 0.5 ⁇ g / g or less, more preferably 0.3 x gZg or less, particularly Preferably it is 0.1 ⁇ g / g or less.
- the purpose is to minimize outgas generated by decomposition of polyoxymethylene resin due to chloride ions during heating.
- the method for reducing chloride ions adhering to the surface is not particularly limited.However, in the step of cooling the molten extruded resin, a step of removing adhering water by air blowing or suction is added, or the chlorine ions contained in the cooling water are ionized.
- a hard disk lamp with a small outgas is obtained through the steps of pellet drying, injection molding, solvent washing, and drying using pellets in which the outgas is reduced in advance and the chloride ion is further reduced.
- the outgassing amount is 20 ⁇ g / g or less, more preferably 15 / g / g or less, more preferably 10 ⁇ g / g or less, and particularly preferably 5 g / g or less.
- the amount of harmful substances in the colorant is important to reduce the amount of harmful substances in the colorant as much as possible.
- a method of reducing the harmful substances in the colorant it is possible to use a raw material containing no harmful substance, or to remove or reduce the harmful substance by treating the colorant at a high temperature in the production process. In this sense, an inorganic pigment that can be treated at a high temperature is preferable.
- the amount of harmful substances in the lamp for hard disk drives is preferably 0.3 ⁇ g / g or less, more preferably 0.3 g / g or less, and particularly preferably 0.05 ⁇ g / g or less.
- the polyoxymethylene resin pellets of the present invention can be extruded by vacuum degassing from one or more vents using a single screw extruder or a twin screw extruder.
- the working temperature is preferably in the range of 180 to 240 ° C, preferably 180 to 220. C, particularly preferably 190 to 210 ° C.
- replacement with inert gas preferable.
- a jacketed biaxial paddle-type continuous polymerization machine through which a heat medium can pass was adjusted to 80 ° C, and trioxane containing 4 ppm of water and formic acid was supplied to the polymerization machine at 40 mol / hr.
- 1,3-dioxolan as cyclic formanol was fed to the polymerization machine at 0.65 mol / hr.
- the polymerization was carried out.
- the polymer discharged from the polymerization machine was put into a 1% aqueous solution of triethylamine to completely deactivate the polymerization catalyst. Thereafter, the polymer was filtered, washed, uniformly mixed, and dried at 120 ° C. to obtain a crude polyoxymethylene copolymer.
- the resulting polio key methylene copolymer contains (relative to O carboxymethyl methylene units) 0.51 moles 0/0 comonomer, melt Furore site was 29 g / l0 min.
- the pellets dried at 80 ° C for 3 hours using a hot-air dryer had an outgassing amount of 50 / ig / g and an attached chlorine ion amount of 0.1 ⁇ g / g or less.
- Min polydimethylsiloxane (D4-D10)) was less than 0.001 xg / g (respectively determined according to the method described below).
- the harmful components targeted by the present invention are not limited to polydimethylsiloxane (D4 to D10), but here, for convenience, the only harmful component to be measured is polydimethylsiloxane. .
- Titanium oxide containing harmful components (polydimethylsiloxane (D4 to D10)) up to 0.001 g gZg
- B2 Titanium oxide containing 5 ⁇ g / g of harmful components (polydimethylsiloxane (D4-D10)) B3; Titanium oxide containing 25 ⁇ g / g of harmful components (polydimethylsiloxane (D4-D10)) B4; (Polydimethylsiloxane (D4 to D10)) containing 50 ⁇ g / g of titanium oxide [0022] (Evaluation method)
- Outgas amount GC-MS method, sample 1 ⁇ Og was heated to 90 ° C in helium gas, helium gas was purged at 50 ml / min, and generated gas was adsorbed on the adsorption tube for 180 minutes. Next, the adsorption tube was set on a GC-MS (GC-5890 + MSD-5972A, manufactured by Hewlett-Packard Company), desorbed, and the outgas was determined using a non-polar column and hexadecane as a reference substance.
- GC-MS GC-5890 + MSD-5972A, manufactured by Hewlett-Packard Company
- Amount of harmful components in art gas The above-mentioned harmful components in the art gas components (polydimethylsiloxane (D4 to D10)) were identified and their amounts were measured (amount per sample 1. Og (xg); ⁇ g / g) o
- the polyoxymethylene resin pellets were dried with a hot air drier at 100 ° C. for 3 hours. Then, using an injection molding machine with an injection capacity of 5 ounces, set the cylinder temperature: 200 ° C, the mold temperature: 100 ° C, the injection time: 20 seconds, and the cooling time: 10 seconds. A 15 x 6 x 5 mm, 0.4 g weight lamp was molded. Next, the lamp was set in an ultrasonic cleaner set to 60 ° C in four tanks (the first tank was a surfactant (containing 5% of Elise 1000 (registered trademark) manufactured by Asahi Kasei Chemicals Corporation), and the second to the second tanks). (4 tanks were used with pure water) and immersion ultrasonic cleaning was performed continuously for 20 minutes each. The washed lamp was dried at 80 ° C for 20 hours by a hot air drier.
- the extruded resin was cooled with tap water (containing 50 ⁇ g Zg of chlorine ions), then the water was removed by suction through a water removal device, and pelletized using a strand cutter. did.
- the outgassing amount of the obtained pellets was 23 zg / g, and the amount of attached chloride ions was 0.3 zg / g.
- the lamp was molded, washed, and dried to measure the amount of outgas and the amount of harmful substances. The results are shown in Table 1.
- the outgassing amount of the obtained pellet was 15 ⁇ g / g, and the amount of attached chloride ions was 0.7 ⁇ g / g.
- lamps were molded, washed, and dried to measure the amount of outgas and the amount of harmful substances. Table 1 shows the results.
- Extruded resin was cooled down with tap water (containing 50 ⁇ g / g of chloride ions), then the water was removed by suction through a water removal device, and pelletized using a strand cutter. Was carried out.
- the outgassing amount of the obtained pellet was 10 ⁇ g / g, and the amount of attached chloride ions was 0.3 ⁇ g / g.
- the lamp was molded, washed, and dried to measure the amount of outgas and the amount of harmful substances. Table 1 shows the results.
- Example 4 The operation was performed in exactly the same manner as in Example 4 except that the vent port of the twin-screw extruder of Example 4 was increased by one to make two vent ports and deaerated under the same conditions.
- the outgassing amount of the obtained pellet was 7 ⁇ g / g, and the amount of attached chloride ions was 0.3 ⁇ g / g.
- Table 1 The results are shown in Table 1.
- Example 4 was carried out in exactly the same manner as in Example 4 except that the coloring agent (B 1) was changed to the coloring agent (B2).
- the amount of outgas of the obtained pellet was 10 x gZg, and the amount of attached chlorine ions was 0.3 ⁇ gZg.
- the results are shown in Table 1.
- Example 6 was carried out in the same manner as in Example 4, except that the colorant (B2) was changed to the colorant (B3).
- the amount of outgas of the obtained pellet was 11 ⁇ g / g, and the amount of attached chlorine ions was 0.3 ⁇ g Zg.
- the results are shown in Table 1.
- Example 7 was carried out in exactly the same manner as in Example 4 except that the colorant (B3) in Example 7 was changed to the colorant (B4).
- the amount of outgas of the obtained pellet was 12 x gZg, and the amount of attached chloride ion was 0.3 ⁇ g / g. Table 1 shows the results. [Comparative Example 1]
- the outgas amount of the obtained pellets was 55 ⁇ g / g, and the amount of attached chlorine ions was 0.6 ⁇ g / g.
- the lamp was molded, washed, and dried, and the outgas amount and harmful substance amount were measured, and the results are shown in Table 1.
- Comparative Example 1 was carried out in exactly the same manner with the vent pressure reduced to 0.07 MPa.
- the gas content of the obtained pellets was 30 ⁇ g / g, and the amount of attached chloride ions was 0.6 ⁇ g / g.
- the lamp was molded, washed and dried, and the outgas amount and the harmful substance amount were measured. The results are shown in Table 1.
- Extrusion kneading was carried out using a cylinder temperature of 200 ° C, a screw rotation speed of 100 rpm, a discharge rate of 50 kg / hr, and no vent pressure reduction.
- the extruded resin was cooled with tap water (containing 50 ⁇ g / g of chloride ions), pelletized using a strand cutter, and dried with a hot air dryer at 80 ° C for 5 hours.
- the amount of outgas of the obtained pellet was 70 agZg, and the amount of attached chlorine ions was 0.7 g / g.
- the lamp was molded, washed and dried to measure the amount of outgas and the amount of harmful substances. The results are shown in Table 1.
- Comparative Example 5 The operation was performed in exactly the same manner as in Comparative Example 3 except that tap water used for cooling in Comparative Example 3 was changed to water containing 150 zg / g of chloride ions. The outgassing of the obtained pellet was 85 ⁇ g / g, and the attached chlorine ion was 1.3 zg / g. Table 1 shows the results.
- Example-1 Example-2 Example-3 Example-4 Example-5
- Example-6 Example-7
- Composition Polyacetal resin A 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100
- the outgas of the lamp for the hard disk drive can be suppressed to a very low level of 20 ⁇ g / g or less.
- the lamp for a hard disk drive of the present invention is capable of remarkably reducing outgas and harmful components in the outgas, and is effective for improving the reliability of a hard disk drive whose density is increasing more and more.
- this polyoxymethylene resin material which has significantly reduced outgassing and harmful components, makes use of its friction and wear properties and is also ideal for precision parts used in closed conditions.
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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)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/579,671 US7751150B2 (en) | 2004-05-31 | 2005-05-30 | Ramp for polyoxmethylene resin hard disk drive |
CN200580017734XA CN1961040B (zh) | 2004-05-31 | 2005-05-30 | 聚甲醛硬盘驱动器用斜坡 |
DE112005001180T DE112005001180B4 (de) | 2004-05-31 | 2005-05-30 | Rampe für ein Festplattenlaufwerk aus Polyoxymethylenharz sowie Verfahren zu deren Herstellung |
JP2006513989A JPWO2005116137A1 (ja) | 2004-05-31 | 2005-05-30 | ポリオキシメチレン樹脂製ハードディスクドライブ用ランプ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004160830 | 2004-05-31 | ||
JP2004-160830 | 2004-05-31 |
Publications (1)
Publication Number | Publication Date |
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WO2005116137A1 true WO2005116137A1 (ja) | 2005-12-08 |
Family
ID=35450862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/009889 WO2005116137A1 (ja) | 2004-05-31 | 2005-05-30 | ポリオキシメチレン樹脂製ハードディスクドライブ用ランプ |
Country Status (7)
Country | Link |
---|---|
US (1) | US7751150B2 (ja) |
JP (2) | JPWO2005116137A1 (ja) |
KR (1) | KR100832652B1 (ja) |
CN (2) | CN102321335B (ja) |
DE (1) | DE112005001180B4 (ja) |
TW (1) | TWI275614B (ja) |
WO (1) | WO2005116137A1 (ja) |
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US20090013905A1 (en) * | 2007-05-11 | 2009-01-15 | Unimin Corporation | Nepheline syenite powder with controlled particle size and novel method of making same |
US20100304952A1 (en) * | 2006-07-13 | 2010-12-02 | Unimin Corporation | Method of processing nepheline syenite |
US20110123804A1 (en) * | 2006-07-13 | 2011-05-26 | Unimin Corporation | Ultrafine nepheline syenite |
US9361918B2 (en) | 2011-07-01 | 2016-06-07 | Ntn Corporation | Memory disk drive device and resin component therefor |
KR20170024608A (ko) | 2014-10-16 | 2017-03-07 | 아사히 가세이 가부시키가이샤 | 폴리아세탈 수지 성형체 |
US10294377B2 (en) | 2006-07-13 | 2019-05-21 | Covia Holdings Corporation | Ultra fine nepheline syenite powder and products for using same |
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US8759431B2 (en) | 2010-03-29 | 2014-06-24 | Min Aik Technology Co., Ltd. | Durable polyoxymethylene composition |
US20110237727A1 (en) | 2010-03-29 | 2011-09-29 | Jung-Pao Chang | Durable polyoxymethylene composition |
JP6334842B2 (ja) * | 2012-12-20 | 2018-05-30 | 旭化成株式会社 | 導電性ポリアセタール樹脂組成物のペレット及びその製造方法 |
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KR20170024608A (ko) | 2014-10-16 | 2017-03-07 | 아사히 가세이 가부시키가이샤 | 폴리아세탈 수지 성형체 |
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Also Published As
Publication number | Publication date |
---|---|
JP2011074396A (ja) | 2011-04-14 |
TWI275614B (en) | 2007-03-11 |
KR20070028390A (ko) | 2007-03-12 |
CN102321335B (zh) | 2014-04-02 |
DE112005001180T5 (de) | 2009-03-12 |
TW200613428A (en) | 2006-05-01 |
CN1961040B (zh) | 2012-02-22 |
JPWO2005116137A1 (ja) | 2008-04-03 |
DE112005001180B4 (de) | 2013-10-10 |
CN1961040A (zh) | 2007-05-09 |
US20080037175A1 (en) | 2008-02-14 |
KR100832652B1 (ko) | 2008-05-27 |
US7751150B2 (en) | 2010-07-06 |
CN102321335A (zh) | 2012-01-18 |
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