JP2001176259A - Member for information recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide member for information recording apparatus which is small in the vibrations generated in high-speed rotation and high-speed movement and has high impact strength, high modulus of elasticity and high loss coefficient. SOLUTION: The member for information recording apparatus, such as a pickup carrier, is obtained by adding 25 pts.wt. radical reactive compound of <=1,000 in molecular weight to 100 pts.wt. 8-ethyl-tetracyclo[4,4,0.12,5.17,10]- dodeca-3-en which is subjected to ring opening polymerization then to hydrogenation (hydrogenation rate 99.8%) and kneading the mixture to obtain a polymer component and molding this composition by injection molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a member for an information recording device, and more particularly, to a member for an information recording device (for example, a disk substrate, Pickup carriage,
High-speed turntable).

[0002]

2. Description of the Related Art As information recording media, hard disks,
DVDs and the like have been developed. These disk-type recording media are used by rotating them, scanning a magnetic head, a pickup lens, or the like on a disk to read or write information. A disk-type recording medium is usually formed of a disk substrate and a recording film formed on the substrate surface. As a material for the disk substrate, a thermoplastic resin such as polycarbonate, polymethyl methacrylate, or norbornene resin has been proposed. Polycarbonate and polymethyl methacrylate are not necessarily suitable as disk substrates because of large deformation due to moisture absorption.

[0003] The recording capacity of disk-type recording media has been increasing year by year.
The required level is increasing. As the recording capacity increases, it is necessary to increase the rotation speed of the disk-type recording medium. When the disk is rotated at a high speed, the disk and its peripheral members (hereinafter, sometimes referred to as “information recording device members”) resonate, and the resonance points undulate and vibrate. This vibration increases as the rotation speed increases. The gap between the disk surface and the pickup lens or head is very small, about 50 nm. When the vibration increases, the head and the pickup lens collide with the disk, and the head and the pickup lens may be damaged, and the reliability of the apparatus may be significantly impaired. To suppress vibration, a material with a high elastic modulus and a large loss coefficient may be used.However, since the elastic modulus and the loss coefficient are inversely correlated, a member that has a good balance between the two physical properties is conventionally used. Did not.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a member for an information recording apparatus which has a small vibration generated at the time of high-speed rotation or high-speed movement, has a high impact strength, a high elastic modulus and a high loss coefficient. It is in. The present inventors have conducted intensive studies to achieve the above object, and as a result, by molding a composition containing a large amount of a low-molecular-weight radical-reactive compound in an alicyclic olefin polymer, high-speed rotation was achieved. It has been found that a member for information recording equipment having a very small vibration, a high elastic modulus and a high loss coefficient can be obtained, and the present invention has been completed based on this finding.

[0005]

Thus, according to the present invention, a polymer composition containing 100 parts by weight of an alicyclic olefin polymer and 15 to 90 parts by weight of a radical reactive compound having a molecular weight of 1,000 or less is molded. Provided for an information recording device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A member for an information recording device according to the present invention
It is obtained by molding a polymer composition containing an alicyclic olefin polymer and a radical reactive compound.

[0007] The polymer composition used in the present invention contains an alicyclic olefin polymer and a radical reactive compound.

The alicyclic olefin polymer used in the present invention is a polymer having an alicyclic structure in a main chain and / or a side chain. From the viewpoints of mechanical strength and heat resistance, a resin containing an alicyclic structure in the main chain is preferable. As the alicyclic structure,
Although a cycloalkane structure and a cycloalkene structure are mentioned, a cycloalkane structure is preferred from the viewpoint of mechanical strength, heat resistance and the like. Examples of the alicyclic structure include a monocyclic ring, a polycyclic ring, a condensed polycyclic ring, a bridged ring, and a polycyclic ring obtained by combining these. The number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually 4 to 30, preferably 5 to 20, and more preferably 5 to 15, when the mechanical strength and heat resistance The properties of formability and moldability are highly balanced and suitable. The alicyclic olefin polymer used in the present invention is usually a thermoplastic one.

The alicyclic olefin polymer usually contains a repeating unit derived from an olefin having an alicyclic structure (hereinafter sometimes referred to as an alicyclic olefin). The proportion of the repeating unit derived from the alicyclic olefin in the alicyclic olefin polymer is appropriately selected depending on the purpose of use, but is usually 30 to 100% by weight, preferably 50 to 100% by weight, and more preferably 70 to 100% by weight. １００100% by weight. If the proportion of the repeating unit derived from an alicyclic olefin is too small, the heat resistance is poor, which is not preferable. The repeating unit other than the alicyclic olefin-derived repeating unit is not particularly limited, and is appropriately selected depending on the purpose of use.

The alicyclic olefin polymer may have a polar group. As the polar group, acid anhydride group, hydroxyl group, carboxyl group, oxy group, epoxy group, glycidyl group, oxycarbonyl group, carbonyloxy group, carbonyl group, amino group, ester group,
And a nitrile group.

The alicyclic olefin polymer is usually obtained by addition polymerization or ring opening polymerization of an alicyclic olefin and, if necessary, hydrogenation of an unsaturated bond portion or addition polymerization of an aromatic olefin. And hydrogenation of the aromatic ring portion of the polymer. Further, the alicyclic olefin polymer having a polar group is, for example, by introducing a compound having a polar group into the alicyclic olefin polymer by a modification reaction, or copolymerizing a monomer having a polar group. It is obtained by copolymerization as a component.

The alicyclic olefin used for obtaining the alicyclic olefin polymer includes bicyclo [2.2.
1] -hept-2-ene (common name: norbornene), 5
-Methyl-bicyclo [2.2.1] -hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] -hept-2-ene, 5-ethyl-bicyclo [2.2.1] ]-
Hept-2-ene, 5-butyl-bicyclo [2.2.
1] -Hept-2-ene, 5-hexyl-bicyclo [2.2.1] -hept-2-ene, 5-octyl-bicyclo [2.2.1] -hept-2-ene, 5-octadecyl -Bicyclo [2.2.1] -hept-2-ene,
5-ethylidene-bicyclo [2.2.1] -hept-2
-Ene, 5-methylidene-bicyclo [2.2.1] -hept-2-ene, 5-vinyl-bicyclo [2.2.1]
-Hept-2-ene,

5-propenyl-bicyclo [2.2.1]
-Hept-2-ene, 5-methoxy-carbinyl-bicyclo [2.2.1] -hept-2-ene, 5-cyano-
Bicyclo [2.2.1] -hept-2-ene, 5-methyl-5-methoxycarbonyl-bicyclo [2.2.1]
-Hept-2-ene, 5-ethoxycarbonyl-bicyclo [2.2.1] -hept-2-ene, bicyclo [2.
2.1] -Hept-5-enyl-2-methylpropionate, bicyclo [2.2.1] -hept-5-enyl-
2-methyloctaneate,

Bicyclo [2.2.1] -hept-2-ene-5,6-dicarboxylic anhydride, 5-hydroxymethylbicyclo [2.2.1] -hept-2-ene, 5,6
-Di (hydroxymethyl) -bicyclo [2.2.1]-
Hept-2-ene, 5-hydroxy-i-propylbicyclo [2.2.1] -hept-2-ene, 5,6-dicarboxy-bicyclo [2.2.1] -hept-2-ene, Bicyclo [2.2.1] -hept-2-ene-5,
6-dicarboxylic imide, 5-cyclopentyl-bicyclo [2.2.1] -hept-2-ene, 5-cyclohexyl-bicyclo [2.2.1] -hept-2-ene, 5
-Cyclohexenyl-bicyclo [2.2.1] -hept-2-ene, 5-phenyl-bicyclo [2.2.1]-
Hept-2-ene,

Tricyclo [4.3.0.1 ^2,5 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.1 ^2,5 ] deca-3
-Ene, tricyclo [4.4.0.1 ^2,5 ] undeca-3,7-diene, tricyclo [4.4.0.
1 ^2,5] undec-3,8-diene, tricyclo [4.4.0.1 ^2,5] undec-3-ene, tetracyclo ^{[7.4.0.1 10,13.} 0 ^2,7 ] -trideca-2,4,6-11-tetraene (alias: 1,4
- methano -1,4,4a, 9a- tetrahydrofluorene), tetracyclo ^{[8.4.0.1 11,14.} 0
^3,8 ] -tetradeca-3,5,7,12-11-tetraene (alias: 1,4-methano-1,4,4a, 5,1
0,10a-hexahydroanthracene),

Tetracyclo [4.4.0.1 ^2,5 . 1
^7,10 ] -dodec-3-ene (common name: tetracyclododecene), 8-methyl-tetracyclo [4.4.0.
1 ^2, 5. 17, ¹⁰ ] -dodec-3-ene, 8-ethyl-tetracyclo [4.4.0.1 ^2,5 .
17, ¹⁰ ] -dodec-3-ene, 8-methylidene-tetracyclo [4.4.0.1 ^2,5 . ^{17, 10} ] -dodec-3-ene, 8-ethylidene-tetracyclo [4.
4.0.1 ^2,5 . 1 ^7,10 ] -dodec-3-ene,
8-vinyl-tetracyclo [4.4.0.1 ^2,5 . 1
^7,10 ] -dodec-3-ene, 8-propenyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10] - dodeca-3-ene, 8-methoxycarbonyloxy - tetracyclo [4.4.0.1 ^2, 5. 1 ^7,10 ] -dodeca-3-
Ene, 8-methyl-8-methoxycarbonyl-tetracyclo [4.4.0.1 ^2,5 . ^{17, 10} ]-dodeca-
3-ene, 8-hydroxymethyl-tetracyclo [4.
4.0.1 ^2,5 . 1 ^7,10 ] -dodec-3-ene,
8-carboxy-tetracyclo [4.4.0.
^12,5 . ^{17 , 10} ] -dodec-3-ene,

8-cyclopentyl-tetracyclo [4.
4.0.1 ^2,5 . 1 ^7,10 ] -dodec-3-ene,
8-cyclohexyl-tetracyclo [4.4.0.1
^2,5 . 17, ¹⁰ ] -dodec-3-ene, 8-cyclohexenyl-tetracyclo [4.4.0.1 ^2,5 . 1
^7,10 ] -dodec-3-ene, 8-phenyl-tetracyclo [4.4.0.1 ^2,5 . ^{17, 10} ] -dodec-3-ene, pentacyclo [6.5.1.1 ^3,6 . 0
^2,7 . 0 ^{9, 13]} pentadeca-3,10-diene,
Pentacyclo [7.4.0.1 ^3,6 . 1 ^{10, 13} .
Norbornene-based monomers such as 0 ^2,7 ] -pentadeca-4,11-diene;

Cyclobutene, cyclopentene, cyclohexene, 3,4-dimethylcyclopentene, 3-methylcyclohexene, 2- (2-methylbutyl) -1-cyclohexene, cyclooctene, 3a, 5,6,7a-tetrahydro-4,7- Monocyclic cycloalkenes such as methano-1H-indene and cycloheptene; vinyl alicyclic hydrocarbon monomers such as vinylcyclohexene and vinylcyclohexane; alicyclic conjugated diene monomers such as cyclopentadiene and cyclohexadiene; And the like.

As the aromatic olefin, styrene, α
-Methylstyrene, divinylbenzene and the like.

The alicyclic olefin and / or the aromatic olefin can be used alone or in combination of two or more.

A monomer copolymerizable with an alicyclic olefin or an aromatic olefin can be copolymerized if necessary. Specific examples thereof include ethylene, propylene,
-Butene, 1-pentene, 1-hexene, 3-methyl-
1-butene, 3-methyl-1-pentene, 3-ethyl-
1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene,
4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene,
Ethylene or α-olefin having 2 to 20 carbon atoms such as -decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene;
-Hexadiene, 4-methyl-1,4-hexadiene,
Non-conjugated dienes such as 5-methyl-1,4-hexadiene and 1,7-octadiene; These monomers can be used alone or in combination of two or more.

The method for polymerizing the alicyclic olefin and / or the aromatic olefin and the method for hydrogenation as required are not particularly limited, and can be carried out according to known methods.

Specific examples of the alicyclic olefin polymer include a ring-opened polymer of a norbornene monomer and a hydrogenated product thereof, an addition polymer of a norbornene monomer, a norbornene monomer and a vinyl Compounds (ethylene and α-
Olefin, etc.), monocyclic cycloalkene polymer, alicyclic conjugated diene monomer polymer, vinyl alicyclic hydrocarbon monomer polymer and hydrogenated product thereof,
Examples include aromatic ring hydrogenated products of aromatic olefin polymers. Among these, a ring-opening polymer of a norbornene-based monomer and a hydrogenated product thereof, an addition polymer of a norbornene-based monomer, an addition polymer of a norbornene-based monomer and a vinyl compound, and an aromatic olefin polymer. An aromatic ring hydrogenated product is preferred, and a hydrogenated product of a ring-opened polymer of a norbornene monomer is particularly preferred.

The above alicyclic olefin polymers can be used alone or in combination of two or more.

The alicyclic olefin polymer is not particularly limited by its molecular weight. The molecular weight of the alicyclic olefin polymer is determined by gel permeation chromatography (GPC) using cyclohexane or toluene as a solvent. The weight average molecular weight (Mw) in terms of polystyrene is measured.
And usually 1,000 to 1,000,000, preferably 5,000 to 500,000, more preferably 10,000.
The range is from 00 to 250,000. When the weight average molecular weight (Mw) of the alicyclic olefin polymer is in this range, heat resistance, adhesiveness, smoothness of the film, and the like are balanced, which is preferable.

The molecular weight distribution of the alicyclic olefin polymer is:
Weight average molecular weight (Mw) and number average molecular weight (Mw) measured by GPC using cyclohexane or toluene as a solvent
The ratio (Mw / Mn) to n) is usually 5 or less, preferably 4 or less, more preferably 3 or less. The above ranges of the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) and the measuring method are suitably adapted to the norbornene-based polymer, but are not limited thereto. In the case of an alicyclic olefin polymer whose weight-average molecular weight or molecular weight distribution cannot be measured by the above method, a polymer having a melt viscosity and a degree of polymerization sufficient to form a resin phase by a normal melt processing method is used. be able to.

The glass transition temperature of the alicyclic olefin polymer may be appropriately selected according to the purpose of use.
0 ° C. or higher, preferably 70 ° C. or higher, more preferably 10 ° C.
It is 0 ° C or higher, most preferably 125 ° C or higher.

The radical reactive compound used in the present invention is
It is a compound that has an unpaired electron in the molecule and can be easily broken by heat, light, radiation or electron beam. This radical reactive compound has a molecular weight of 1
000, preferably 800 or less. 10
A compound having a molecular weight of more than 00 does not sufficiently absorb vibration during high-speed rotation.

Specific examples of the radical reactive compound include:
1,6-hexanediol-bis [3- (3,5-di-
t-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-t-butyl-4)
-Hydroxyphenyl) propionate, N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocinnamide), 3,5-di-t-butyl-4-hydroxylphosphonate Phonate-diethyl ester, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl)
Benzene, calcium bis (3,5-di-butyl-4-hydroxybenzylphosphonate) calcium, 3,9-bis
[2- [3- (3-t-butyl-4-hydroxy-5-
A phenolic compound such as methylphenyl) -propionoxy] -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane;

Sulfide compounds such as dilauryl-3,3'-thiodipropionate and pentaerythrityltetrakis (3-laurylthiopropionate);

Phosphite compounds such as tris (2,4-di-t-butylphenyl) phosphite, tris nonyl phosphite, tris nonyl phenyl phosphite;

2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (2-hydroxy-
3,5-bis (α, α-dimethylbenzyl) phenyl)
-2H-benzotriazole, 2- (3,5-di-t-
Butyl-2-hydroxyphenyl) benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
5-chlorobenzotriazole, 2- (3,5-di-t
-Amyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, methyl-3- (3-t-butyl-5- (2H-benzotriazole2- Ill) -4
Benzotriazole compounds such as -hydroxyphenyl) propionate / polyethylene glycol condensate and hydroxyphenylbenzotriazole derivative;

2-hydroxy-4-methyoxybenzophenone-5-sulfoxide, 2-hydroxy-4-n
-Octoxybenzophenone, 2-hydroxy-4-n
-Dodecyloxybenzophenone, 2-hydroxy-4-
Benzophenone compounds such as benzyloxybenzophenone;

1,3-diphenylguanidine, 1,3-
A guanidine compound such as di-o-tolylguanidine;
2-mercaptobenzothiazole, dibenzothiazyl-
Thiazole compounds such as disulfide- (2,2'-dithiobisbenzothiazole), N-cyclohexylbenzothiazolesulfenamide, zinc-2-mercaptobenzothiazole; dithio compounds such as zinc-diethyldithiocarbamate, zinc-diethyldithiocarbamate Acid salts;

Sulfenamide compounds such as N-cyclohexyl-2-benzothiazylsulfenamide, Nt-butyl-2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide A thiuram compound such as tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide;

Thiourea compounds such as ethylenethiourea, N, N'-diphenylthiourea and diethylthiourea; organic compounds such as benzoylperoxide, dicumylperoxide and 1,3-di (t-butylperoxyisopropyl) benzene Peroxides and the like. Among these radically reactive compounds, phenol compounds, sulfide compounds, phosphite compounds, guanidine compounds, thiazole compounds, sulfenamide compounds, and thiuram compounds are preferred, and phenol compounds or sulfenamide compounds are particularly preferred. Phenol compounds are preferred from the viewpoints of ease of use and balance of properties.

The amount of the radical-reactive compound is 15 to 90 parts by weight, preferably 20 to 60 parts by weight, based on 100 parts by weight of the alicyclic olefin polymer. When the amount is small, the vibration absorption is low, and when the amount is large, the impact strength is reduced.

In the present invention, if necessary, other compounding agents can be added to the polymer composition. The compounding agent is not particularly limited as long as it is generally used in the resin industry, for example, a flame retardant, a leveling agent,
Examples include an antistatic agent, a slip agent, an antiblocking agent, an anti-fogging agent, a lubricant, a dye, a natural oil, a synthetic oil, a wax, and a coloring agent.

In the present invention, if necessary,
Hard resins and soft polymers other than alicyclic olefin polymers can be added.

Examples of the hard resin include polyolefins such as polyethylene, polypropylene, polybutene and polypentene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; polyamides such as nylon 6 and nylon 66; ethylene-ethyl acrylate copolymer; Vinyl acetate copolymer, polycarbonate; and the like.

Examples of the soft polymer include natural rubber,
Polybutadiene rubber, polyisoprene rubber, acrylonitrile / butadiene copolymer rubber, styrene / butadiene copolymer rubber, styrene / isoprene copolymer rubber,
Diene rubbers such as styrene / butadiene / isoprene terpolymer rubbers; ethylene / α-olefin copolymers such as ethylene / propylene copolymer and ethylene / butene copolymer; and propylene / other α-olefin copolymers Saturated polyolefin rubber such as coalesced rubber; α-olefin / diene polymer rubber such as ethylene / propylene / diene copolymer, α-olefin / diene copolymer, isobutylene / isoprene copolymer, isobutylene / diene copolymer; Special rubbers such as urethane rubber, silicone rubber, polyether rubber, acrylic rubber and ethylene acrylic rubber; aromatic vinyl resins such as styrene / butadiene / styrene / block copolymer rubber and styrene / isoprene / styrene / block copolymer Polymers and their hydrogenated products; urethanes Thermoplastic elastomers; polyamide thermoplastic elastomers; 1,2-polybutadiene-based thermoplastic elastomers; and the like. The soft polymers can be used alone or in combination of two or more.

The polymer composition used in the present invention may further contain organic or inorganic particles. As the organic particles, crosslinked polymer particles or hard polymer particles are suitably used. Specific examples of the polymer constituting the organic particles include polyolefins such as polystyrene, polyethylene, polypropylene, polymethylbutene-1, polybutene-1, and poly4-methylpentene-1; polyvinyl chloride, polyvinylidene chloride, and polyfluorinated. Vinyl, polychloroprene, halogen-containing vinyl polymers such as chlorinated rubber; polyacrylates, polymethacrylates, polyacrylamides, polyacrylonitriles, polyepoxides, polyvinyl acetates, vinyl polythreate phosphates, polyvinyl benzoates, vinyl polymaleates, polyethylene oxides, Polysulfone, polyurethane, polyethylene terephthalate, polybutylene terephthalate, phenolic resin, alkyd resin, melamine resin,
And silicone.

Examples of the inorganic particles include silica, silica alumina, diatomaceous earth, alumina, calcium carbonate, titanium oxide, magnesium oxide, pumice powder, pumice balloon, shirasu, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite. , Calcium sulfate, potassium titanate, barium carbonate, barium sulfate, calcium sulfite, talc, kaolin, mica, asbestos, glass flakes, glass beads, carbon powder, calcium silicate, montmorillonite, pentonite, graphite, aluminum powder, molybdenum sulfide And the like. Among the organic particles or the inorganic particles, the inorganic particles are preferable, among the inorganic particles, calcium carbonate, titanium oxide, talc, silica, silica alumina, barium carbonate,
Barium sulfate is preferred.

The organic or inorganic particles used in the present invention are:
The average particle size is usually 0.05 to 50 μm, preferably 0.5 to 20 μm. The amount of the organic particles or the inorganic particles is usually 5 to 100 parts by weight, preferably 10 to 50 parts by weight based on 100 parts by weight of the alicyclic olefin polymer.

The member for information recording equipment of the present invention is obtained by molding the above-mentioned polymer composition. Molding method is not particularly limited, injection molding, extrusion molding, injection blow molding,
Examples include blow molding, calendar molding, compression molding, transfer molding, inflation molding, and vacuum molding.

The information recording device member of the present invention can be used as each member of the information recording device by shaping into various shapes. For example, a hard disk substrate, an optical disk substrate, a magnetic disk substrate, a disk substrate such as a magneto-optical disk substrate, a pickup lens or a pickup carriage of a magnetic head, a turntable, a crank bar, and the like can be mentioned.
It is suitably used for a disk peripheral member such as a turntable.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A member for an information recording apparatus according to the present invention will be specifically described with reference to embodiments. The evaluation method performed in this example is as follows.

(1) Vibration Absorbing A composition was prepared with a length of 155 mm, a width of 15 mm, and a thickness of about 1 mm.
, And both ends were released (free ends), vibration was applied to the center, and the vibration state of the whole plate was observed to determine the loss coefficient. The larger the value of the loss coefficient, the better the vibration absorption.

(2) Elastic Modulus The flexural modulus was measured according to JIS K7171. The higher the value of the flexural modulus, the better.

(3) Izod impact strength Izod impact strength was measured in accordance with JIS K 7110.
Specified. Higher impact strength values indicate better
You. Impact strength is usually 2 kgf · cm / cm ²That's it
Is preferred.

Example 1 8-ethyl-tetracyclo [4.4.0.1 ^2,5 . 1
^7,10 ] -dodec-3-ene is subjected to ring-opening polymerization, and thereafter,
100 parts by weight of the hydrogenated product (hydrogenation ratio: 99.8%) was added to 25 parts by weight of the phenol compound represented by the formula (1).
In the above, Me represents a methyl group. Molecular weight 740),
The mixture was kneaded to obtain a polymer composition. This composition was molded into a pickup carriage by injection molding. Table 1 shows the evaluation results.

[0052]

Embedded image

Examples 2-3 and Comparative Examples 1-2 A pickup carriage was obtained in the same manner as in Example 1 except that the amount of the phenol compound represented by Chemical Formula 1 was changed to the amount shown in Table 1. Table 1 shows the evaluation results.

Comparative Example 3 A phenol compound represented by Chemical Formula 1 was converted to a compound represented by Chemical Formula 2 (wherein, Me represents a methyl group; molecular weight 1064).
A pickup carriage was obtained in the same manner as in Example 1 except for changing to. Table 1 shows the evaluation results.

[0055]

Embedded image

Example 4 A phenol compound represented by Chemical Formula 1 was converted to N-cyclohexyl-2-benzothiazylsulfenamide (molecular weight = 26).
A pickup carriage was obtained in the same manner as in Example 1 except for changing to 4.4). Table 1 shows the evaluation results.

[0057]

[Table 1]

[0058]

The information recording device member of the present invention has a large loss coefficient against vibration and a high elastic modulus. Also strong in impact strength. Since members for information recording devices such as a pickup carriage and a turntable can minimize vibrations caused by resonance, the reliability of the information recording device can be greatly improved.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 25/04 101 G11B 25/04 101L

Claims (4)

[Claims] 1. An alicyclic olefin polymer of 100 parts by weight,
And a radical reactive compound 15 or less having a molecular weight of 1000 or less.
An information recording device member formed by molding a polymer composition containing 90 parts by weight. 2. An alicyclic olefin polymer of 100 parts by weight,
And a radical reactive compound 15 or less having a molecular weight of 1000 or less.
A pickup carriage for information recording equipment formed by molding a polymer composition containing 90 parts by weight. 3. An alicyclic olefin polymer of 100 parts by weight,
And a radical reactive compound 15 or less having a molecular weight of 1000 or less.
A turntable for information recording equipment formed by molding a polymer composition containing 90 parts by weight. 4. An alicyclic olefin polymer of 100 parts by weight,
And a radical-reactive compound 15 having a molecular weight of 1,000 or less.
An information recording disk formed by molding a polymer composition containing from 90 to 90 parts by weight.