JPH064902A - Polycarbonate resin composition and substrate for optical recording medium using the same and its production - Google Patents

Abstract

PURPOSE:To form the substrate for an optical recording medium having a good release property by using a polycarbonate resin compsn. contg. an addition polymerized compd. obtd. by the reaction of a prescribed alcohol ester compd. and an isocyanate compd. CONSTITUTION:The release property of the polycarbonate resin compsn. into which the addition polymerized compd. obtd. by the reaction of the ester compd. by higher fatty acid and polyhydric alcohol and isocyanate-contg. compd. is incorporated at 0.01 to 3wt.% is greatly improved. Then, the substrate for the optical recording medium which has the good release property, obviates mold contamination and has stable quality is continuously formed with high productivity by using such addition polymerized compd.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a polycarbonate resin composition having an excellent releasability, which contains an addition compound obtained by the reaction of an ester compound with an isocyanate-containing compound, and an optical composition using the resin composition. The present invention relates to a method for manufacturing a substrate for an optical recording medium that records and reproduces information.

[0002]

2. Description of the Related Art Polycarbonate resins (hereinafter abbreviated as PC) are excellent in transparency, heat resistance, impact resistance, dimensional stability, electrical characteristics, etc. Widely used in various fields. As the molding method, injection molding, blow molding, injection blow molding, compression molding, extrusion molding and the like are adopted. In the above molding, defective release from the mold not only deteriorates the quality such as appearance and strength of the molded product, but also requires spraying the mold release agent directly onto the mold, which lengthens the molding cycle and results in production. This will cause deterioration of sex.

As an effective method for solving this problem, there is a method in which a release agent is contained in the polycarbonate resin itself to reduce adhesion to a mold, die, roll or the like.

As the releasing agent, various compounds generally known as "lubricants" are known. For example, hydrocarbons having 16 or more carbon atoms, fatty acids, fatty acid amides, fatty acid esters, and metallic soaps of fatty acids. A large number of compounds such as compounds, higher alcohols, polyhydric alcohols, and partial esters of fatty acids can be exemplified. Specifically, Japanese Patent Publication No. 47-4109
It is proposed in Japanese Patent Publication No. 2 to add an ester or a partial ester of a higher aliphatic carboxylic acid and a higher aliphatic alcohol or a polyhydric alcohol.

However, the problem with the various molding methods is not limited to the mold releasability. Another major issue is mold contamination. This is because by improving the mold releasability from the mold, contamination of the mold due to resin residue and the like can be solved, but on the other hand, the mold release agent remains on the mold and deteriorates the quality of the molded product. Sometimes. Therefore, the mold release agent is required to have both a sliding property and a low residual property in the mold.

On the other hand, there is an optical recording medium manufactured by using a resin.

The optical recording medium is constructed by providing an optical recording layer on a transparent substrate through which recording / reproducing light, such as a semiconductor laser, is transmitted, and further laminating this with a protective member. On the substrate for optical recording medium (hereinafter, abbreviated as substrate), micron-order fine concavo-convex preformats such as tracking grooves and address information bits are formed in advance. Injection method, compression method,
Methods such as 2P method and casting method are known. However, it is difficult for these methods to satisfy the mass productivity and the cost performance. As a method for satisfying these requirements, for example, in JP-A-56-86721, a thermoplastic resin sheet is heated by an infrared lamp in a heating box, and an uneven signal is formed by a pair of molding rolls. A method of manufacturing is disclosed.

Since this method is capable of continuously processing a roll sheet with a forming roll, it is a method which is extremely excellent in mass productivity, but has the following problems. (1) Since the sheet that has been molded once is heated, the sheet is deformed when it is softened by heating due to strain at the time of molding the sheet, for example, strain such as stretching, and even if the preformat pattern is transferred to this with a molding roll. A substrate having a high precision preformat cannot be obtained. (2) Since the heat-softened resin sheet is an elastic body, it is impossible to accurately transfer the fine concavo-convex preformat by pressing with a molding roll.

In order to solve such a problem, Japanese Patent Publication No. 63-31847 discloses that a base film is provided with an ultraviolet curable resin layer, and a signal is transferred by a stamper to be cured to continuously manufacture a flexible disk. A method of doing so is disclosed. However, this method has a problem in that the number of steps is large and the cost is increased.

Therefore, the authors melt the thermoplastic resin and extrude it to form a resin sheet, and at the same time, transfer the concave-convex shape for preformat signal to the resin sheet using a stamper roll to manufacture a substrate for optical recording medium. Invented a method of doing.

However, even in this method, when the substrate is manufactured, the releasability between the stamper roll and the resin sheet immediately after molding is poor, and the resin adheres to the surface of the stamper roll or the sticking phenomenon occurs. There is a problem that the uneven shape for the preformat signal may not be accurately transferred.

In order to solve the above problems, it is possible to manufacture a substrate using a resin containing a release agent.
When a substrate is manufactured for a long period of time, there has been a problem that the release agent adheres to and accumulates on the surface of the stamper roll and the surface of the pressing roll, which makes it impossible to accurately transfer the uneven shape for preformat signal.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and improves the releasability of a polycarbonate resin, forms a resin sheet by melt extrusion, and at the same time, forms a resin sheet. In the case of manufacturing a substrate for an optical recording medium such as an optical disk or an optical card by transferring the concave-convex preformat shape of the stamper roll onto the release molding compound containing an addition polymerization compound obtained by the reaction of an ester compound and an isocyanate-containing compound, By using a polycarbonate resin composition having excellent properties, the inventors have come to complete the present invention by knowing that the concave and convex preformat signals can be accurately transferred even during continuous production for a long time. A polycarbonate resin composition having good releasability, which solves the above problems, and an optical recording medium substrate using the same It is to provide a manufacturing method.

[0014]

To achieve the above object, the polycarbonate resin composition of the present invention contains a polyhydric alcohol ester compound of a higher fatty acid and an addition polymerization compound obtained by the reaction of an isocyanate compound. Including 0.01 to 3% by weight of an additional weight compound.

Further, in the present invention, a polycarbonate resin composition containing a polyhydric alcohol ester compound of a higher fatty acid and an addition polymerization compound obtained by a reaction with an isocyanate compound is melted and extruded from a die to form a polycarbonate resin sheet. Substrate for optical recording medium, which includes a step and a step of transferring the preformat to one surface of the resin sheet by pressing with a preformat roller and a roller arranged so as to face the preformat roller before the resin sheet is cured. In addition to the addition polymerization compound, a polycarbonate resin containing a polyhydric alcohol ester of a higher fatty acid is used, the polyhydric alcohol is pentaerythritol, and an ultraviolet absorber in addition to the addition polymerization compound. Polycarbonate resin containing Including the use.

Further, the present invention is an optical recording medium substrate comprising a polycarbonate resin composition containing an addition polymerization compound obtained by reacting a polyhydric alcohol ester compound of a higher fatty acid with an isocyanate compound.

The present invention will be described in detail below.

The polycarbonate resin used in the present invention is produced by a known method using a dihydric phenol and phosgene or diphenyl carbonate, and has a molecular weight of 15.0.
An aromatic polycarbonate of 0 to 35.000,
Homo, copolycarbonate resin, long-chain alkyl group as an end group, end-modified one having an alkyl ester group, and branched one are not particularly limited. Typically, those produced by an interfacial polymerization method using 2.2-bis (4-hydroxyphenyl) propane (= bisphenol A) and phosgene can be mentioned.

In the present invention, an addition polymerization compound is added to the above polycarbonate resin as a release agent to prepare a polycarbonate resin composition.

The addition polymerization compound contained in the polycarbonate resin composition of the present invention is added with an isocyanate-containing compound by utilizing the residual hydroxyl group of the ester compound obtained from a higher fatty acid and a polyhydric alcohol as shown below. It is a polymerized compound.

Examples of the higher fatty acid include capric acid, undecyl acid, lauric acid, tridecyl acid, myristic acid, pentadecyl acid, palmitic acid, heptadecyl acid,
Stearic acid, nonadecanoic acid, arachidic acid, behenic acid,
Lignoceric acid, serotic acid, heptacosanoic acid, montanic acid, melissic acid, saturated fatty acid such as laxeric acid, acrylic acid, crotonic acid, isocrotonic acid, caproreic acid, undecylenic acid, oleic acid, elaidic acid, cetrainic acid, erucic acid, Unsaturated fatty acids such as brassic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid, sardonic acid, nisinic acid, propiolic acid and stearolic acid, branched fatty acids such as isovaleric acid, malvalic acid, sterculic acid, hydronocarbine Acids, alicyclic fatty acids such as shoalmoogric acid and golulinic acid, and oxygen-containing fatty acids such as sabinic acid, iprolic acid, yarapinoleic acid, uniperic acid, ricinoleic acid, fueronic acid and cerebronic acid can be used, especially the melting point Has a carbon number of 10 to 30 at 20 ° C or higher Fatty acid can be suitably used.

The higher fatty acids can be used alone or in combination of two or more.

As the polyhydric alcohol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, trimethylene glycol, butanediol, pentanediol, Hexylenediol, octylene glycol, glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, 1,3-butylene glycol, glycerin monoallyl, (4- (hydroxyethoxy) phenol) propane, sorbitol, neopentyl glycol, tris Hydroxyethyl isocyanurate, bisphenol, hydrogenated bisphenol, bisphenol glycol ether, etc. Polyhydric alcohols H groups 2-6, and various epoxy (e.g., triglycidyl isocyanurate) and the like.

The ester obtained by reacting the above-mentioned higher fatty acid with a polyhydric alcohol or a polyhydric epoxy compound must have reactivity with an isocyanate compound. That is, it must have a carboxyl group derived from a fatty acid or a hydroxyl group derived from a polyhydric alcohol as active hydrogen. For example, among the esters obtained by the reaction of pentaerythritol, which is a tetravalent polyhydric alcohol, with higher fatty acids, the esters used in the present invention are monoesters, diesters and triesters,
The unreacted OH groups remaining in the ester molecule are subjected to the reaction with the isocyanate compound.

The ester obtained by reacting the higher fatty acid with a polyhydric alcohol or a polyhydric epoxy compound is
It is also possible to use alone or as a mixture of two or more kinds.

Examples of the isocyanate compound include monoisocyanates such as methyl isocyanate, ethyl isocyanate, n-propyl isocyanate, n-butyl isocyanate, octadecyl isocyanate and polymethylene polyphenyl isocyanate, 2,4-tolylene diisocyanate and 4,4'-. Diphenyl isocyanate such as diphenylmethane isocyanate, dianisidine diisocyanate, metaxylylene diisocyanate, 1,5-naphthalene diisocyanate, trans vinylene diisocyanate, 2,6-diisocyanate methylcaproate, triphenylmethane triisocyanate, tris (4-phenylisocyanate thiophosphate) ) 4,
Various isocyanates of triisocyanates such as 4 ′, 4 ″ -trimethyl-3,3 ′, 3 ″ -triisocyanate-2,4,6-triphenylcyanurate can be used. Particularly, diisocyanate and triisocyanate are preferable, and aromatic type is more preferable.

The reaction of the above-mentioned ester and isocyanate can be carried out in accordance with a usual method by employing a heating and stirring operation.
When the heating temperature is too high, coloring of the product obtained becomes remarkable, and when it is too low, the reaction time becomes long. Therefore, it is usually preferable to select a range of about 70 to 150 ° C. Further, the above reaction is carried out by a metal salt catalyst such as stannic chloride,
The use of ferric chloride, potassium oleate, dibutyltin dilaurate and the like allows relatively rapid progress at lower temperatures. Reaction time is usually 0.5-5
It is appropriate to set the time.

The amount of isocyanate used in the above reaction is appropriately selected depending on the type of each raw material used, the reaction conditions, etc., but is usually about 0.1 to 40% by weight, preferably about 0.1% to the ester. It is preferable to be selected from the range of 30 to 30% by weight, and in this range, the desired polymerization reaction can proceed and the release agent can be produced.

The releasing agent, that is, the addition polymerization compound, is
It is contained in the polycarbonate resin in an amount of 0.01 to 3% by weight. Furthermore, 0.03 to 1% by weight, optimally 0.04 to
0.5% by weight is preferred. If it is less than 0.01% by weight, the releasing effect is not sufficiently exhibited, and if it exceeds 3% by weight, the mold may be contaminated, which is not preferable.

In the polycarbonate resin used in the present invention, a conventionally known release agent may be used in combination with the addition polymerization compound, if necessary. As the releasing agent, lubricants such as hydrocarbons having 16 or more carbon atoms, fatty acids, fatty acid amides, fatty acid esters, fatty acid metal soaps, higher alcohols, polyhydric alcohols, partial esters of fatty acids, etc. There are numerous compounds of. In particular, it is effective to use the higher fatty acid polyhydric alcohol ester together.

As the polyhydric alcohol of the higher fatty acid polyhydric alcohol ester and the higher fatty acid, those mentioned above can be used.

Among the above polyhydric alcohols, it is preferable to use pentaerythritol. In addition, ultraviolet absorbers, for example, benzophenone compounds such as 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-octyloxybenzophenone, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2-
[2-hydroxy-3- (3,4,5,6-tetrahydrophthalimido-methyl) -5-methylphenyl] benzotriazole, 2- (2-hydroxy-3.5-tert-butylphenyl) benzo Triazole, 2-
(2-Hydroxy-5-tertiary-octylphenyl) benzotriazole, 2- (2-hydroxy-3.
Examples thereof include benzotriazole-based compounds such as 5-di-tertiary-amylphenyl) benzotriazole.

It is effective to use a copolymerization oligomer of the above-mentioned benzotriazole compound and bisphenol A from the viewpoint of non-staining property to the mold. Further, a heat stabilizer, a coloring agent, a foaming agent, a reinforcing filler such as glass, and an inert filler can be used in combination.

Various known methods can be used to obtain the polycarbonate resin composition of the present invention. For example, the following methods are available. Polycarbonate resin is a known polycarbonate resin, the addition polymerization compound of the present invention is dissolved in a solvent capable of dissolving the polycarbonate resin together with the polycarbonate resin, for example, methylene chloride, etc., to remove the methylene chloride, solidify the polycarbonate resin composition. , Pelletize with an extruder.

Further, there is a method in which an addition polymerization compound is added to a high temperature state of 120 ° C. or higher taken out from a dryer after polymerization of a polycarbonate resin, mixed by a high speed mixer, and solidified into pellets.

Next, a method of manufacturing the substrate for an optical recording medium of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a method of molding an optical recording medium substrate by transferring uneven shapes such as guide grooves and preformat patterns to a molding resin by a horizontal three-roll method. Is a T-die, 3 is a first roll for molding, 4 is a stamper roll (second roll), 5 is a third roll, and 6 is a take-up machine.

The sheet 7 extruded in a sheet form from the T die 2 of the extruder 1 is guided between the first roll 3 and the stamper roll (second roll) 4, and here, both rolls 3,
While being pressed by 4, the shape of a stamper (not shown) attached to the outer peripheral surface of the stamper roll 4 is transferred. After the transfer, the sheet 7 is then transferred to the third roll 5
After passing between the stamper roll 4 and the stamper roll 4, it is taken up by the take-up machine 6. The stamper roll is obtained by adhering or mechanically fixing a metal stamper to a mirror surface roll.

[0038]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 Polycarbonate resin (manufactured by Teijin Chemicals Ltd .: L-122)
5) with 0.2% by weight of addition polymerization compound (Yoshikawa Oil & Oil Co., Ltd.)
Manufacturing: A pelletized polycarbonate resin composition containing Lanox FPI-2110) was used.

Lanox FPI-2110 is a compound obtained by addition-polymerizing tolylene diisocyanate with a higher fatty acid mixture obtained by mixing behenic acid and stearic acid with pentaerythritol and having a melting point of 71 ° C.
(By the DSC method). Extrusion molding as shown in FIG. 2 was carried out by using an extruder having a screw diameter of 65 mm and a T-die having a width of 300 mm attached. The mirror-finished rolls 13, 14 and 15 are made of chrome-plated steel and are mirror-finished. Extrusion molding was performed at a T-die temperature of 300 ° C., a molding speed of 3.0 m / min, and a resin plate thickness of 0.4 mm. The temperature of the oil to be circulated is controlled by the rolls 13, 14, 15
When 100 ° C., 110 ° C. and 130 ° C. were set in this order, the surface temperature of each roll was 115 ° C., 125 ° C. and 135 ° C. Molding was performed for 6 hours, and the presence or absence of stains on the surfaces of the rolls 13 and 14 and the releasability of the polycarbonate molded resin sheet from the roll 14 were observed. Comparative Example 1 Extrusion molding was performed in the same manner as in Example 1 except that the pellets of the polycarbonate resin L-1225 containing no addition polymerization compound were used, and the same observations were carried out. Comparative Example 2 Extrusion molding was performed in the same manner as in Example 1 except that the addition polymerization compound was changed to stearic acid monoglyceride in Example 1, and the same observation was performed.

The observation results are shown in Table 1.

[0041]

[Table 1] Evaluation: Contamination: ○ After 6 hours, the roll surface is equivalent to the mirror surface state before molding.

Δ After 6 hours, the surface of the roll becomes slightly cloudy.

After 6 hours, deposits are deposited on the roll surface.

Release: ○ No peeling unevenness is observed on the surface of the molded sheet.

× Peeling unevenness is observed on the surface of the molded sheet. Examples 2 to 5 The content of the addition polymerization compound in Example 1 was 0.01,
Sheet molding was performed in the same manner as in Example 1 except that the amounts were 0.03, 1.0, and 3.0% by weight. Examples 6 and 7 The content of the addition polymerization compound in Example 1 was 0.00
Sheet molding was performed in the same manner as in Example 1 except that the amount was 5, 5.0% by weight. Table 2 shows the evaluation results of roll stains and releasability during sheet forming in Examples 2 to 5 and Examples 6 and 7.

[0046]

[Table 2] The evaluation criteria are the same as in Table 1.

Next, the production of the optical card substrate will be described with reference to examples. Example 8 Polycarbonate resin (manufactured by Teijin Chemicals Ltd .: L-122)
The higher fatty acid mixture obtained by mixing behenic acid and stearic acid in 5) is esterified with pentaerythritol.
Compound obtained by addition polymerization of tolylene diisocyanate (Yoshikawa Oil Co., Ltd .: Lanox FPI-2110, melting point 71)
C.) was used to form a substrate by using a pelletized polycarbonate resin containing 0.2% by weight, and extruding the sheet with an extruder (T die having a width of 300 mm) having a diameter of 65 mm shown in FIG. At this time, the temperature inside the extruder was 270 ° C, and the temperature of the T die was 300 ° C. The forming first to third rolls are made of carbon steel having a surface plated with chrome, and have a diameter of 300 mm. As the stamper roll, a nickel stamper (thickness 100 μm) produced for an optical card is used as a mirror surface roll. It was screwed to and used. Further, the temperature of the roll was adjusted by circulating oil in the roll. The temperatures of the oils circulated through the first to third rolls are 80 ° C, 100 ° C, 13 ° C, respectively.
At 0 ° C., a take-up speed of 3.0 m / min and a substrate thickness of 0.
When extrusion molding was performed at 4 mm, the surface temperature of each roll was 110 ° C. for the first roll and 120 ° for the second roll.
C., 135.degree. C. on the third roll.

Under the above molding conditions, resin molding was continuously carried out for 8 hours, but no stain was visually observed on the surface of the roll 3 and the stamper surface on the roll 4. Further, the releasability of the sheet 7 from the roll 4 was good, and the optical card preformat pattern was similarly faithfully transferred from the molding start to the molding end. Example 9 As a release agent, a compound obtained by addition-polymerizing tolylene diisocyanate with a higher fatty acid mixture obtained by mixing behenic acid and stearic acid with pentaerythritol, and a mixture of behenic acid and stearic acid were used as pentaerythritol. And a esterified mixture (Ranox FPS-7 melting point 67 ° C., manufactured by Yoshikawa Oil Co., Ltd.) are used, and a spiral stamped nickel stamper (thickness 150 μm for optical disk is used as a stamper roll.
m) is an adhesive (Sony Bond Co., Ltd., trade name SC55)
An optical disk substrate (thickness: 1.2 mm) was formed in the same manner as in Example 6 by using the one adhered to a mirror surface roll in. At this time, the temperature of the roll temperature adjusting oil is the first roll 90.
C., the second roll 110.degree. C., the third roll 130.degree. C., and the take-up speed was 2 m / min.

As a result of continuously molding for 15 hours under the above conditions, no stain adhesion was observed on the stampers on the rolls 3 and 4, and the transfer of the spiral pattern was good from the start to the end of the molding. Comparative Example 3 Sheet molding was carried out continuously for 8 hours in the same manner as in Example 8 except that a polycarbonate resin containing no addition polymerization compound (L-1225 manufactured by Teijin Chemicals Ltd.) was used. Roll 3 and roll 4
A small amount of polycarbonate resin was deposited on the surface of the upper stamper, which caused wavy peeling unevenness on the sheet surface in the direction perpendicular to the sheet extrusion direction. Comparative Example 4 In Example 8, when glycerin monostearate was used instead of the addition polymerization compound and sheet molding was performed in the same manner as in Example 6, the releasability of the sheet 7 from the roll 4 was good, Clouds began to appear on the stamper surfaces of rolls 3 and 4 30 minutes after the start of molding, and when the surface of the molded sheet was observed under a microscope, a portion where the preformat pattern was missing was recognized. Examples 10 to 13 The content of the addition polymerization compound in Example 8 is 0.01,
Sheet molding was performed in the same manner as in Example 8 except that the amounts were 0.03, 1.0, and 3.0% by weight. Examples 14 and 15 The content of the addition polymerization compound in Example 8 was 0.00.
Sheet molding was performed in the same manner as in Example 8 except that the amount was 5, 5.0% by weight. Table 3 shows the evaluation results of the releasability at the time of sheet molding, the non-contamination property of the stamper roll, and the transfer fidelity of the preformat pattern in Examples 10 to 13 and Examples 14 and 15.

[0050]

[Table 3] * 1 A small amount of polycarbonate resin accumulates on the stamper surface on rolls 3 and 4 over time, which causes wavy peeling unevenness on the sheet surface in the direction perpendicular to the sheet extrusion direction, degrading transferability. * 2 Transfer fidelity deteriorates due to the buildup of release agent on the stamper surface over time. Example 16 In Example 8, in addition to the addition polymerization compound, an ultraviolet absorber (Mitsubishi Gas Chemical Co., Ltd .: LA-24P Mitsubishi Gas Chemical Co., Ltd., a copolymerization oligomer of a benzotriazole compound and bisphenol A) A resin substrate for an optical card was obtained in the same manner as in Example 8 except that a polycarbonate resin containing 1.0% by weight of was used. The mold releasability during molding, non-staining property, and transferability were all good.

The resin substrates obtained in Examples 8 and 16 were xenon fade meters manufactured by Suga Test Instruments Co., Ltd .: FAL-25Ax-HC-BE.
c 43 ° C. 70% RH, 40 mw / cm ² , 500H was used and the light resistance was evaluated. As a result, the resin substrate of Example 8 turned yellow, but the resin substrate of Example 16 showed discoloration. There wasn't.

[0052]

As described above, a polycarbonate resin composition containing an addition polymerization compound obtained by the reaction of an ester compound with a higher fatty acid and a polyhydric alcohol and an isocyanate-containing compound has improved releasability from a mold. Not only is this done, but there is no contamination of the mold, so that the quality of the molded product is stable and the productivity is improved.
Further, by using this polycarbonate resin, by melting and extruding the polycarbonate resin with an extruder equipped with a T die to form a resin sheet and pressing a stamper roll having a predetermined shape on the extruded resin sheet, An optical recording medium substrate having a predetermined shape transferred to the sheet can be continuously manufactured with high quality and high productivity.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of an optical card substrate manufacturing apparatus used for carrying out the present invention.

FIG. 2 is a schematic explanatory view showing an extrusion molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2 T die 3 1st roll 4 2nd roll (stamper roll) 5 3rd roll 6 Pulling machine 7 Sheet 11 Extruder 12 T die 13 Mirror surface roll 14 Mirror surface roll 15 Mirror surface roll 16 Forming plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication C08L 75:04) (72) Inventor Kai Oka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Toshiya Yuasa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hitoshi Yoshino 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (8)

[Claims] 1. A polycarbonate resin composition comprising a polyhydric alcohol ester compound of a higher fatty acid and an addition polymerization compound obtained by a reaction with an isocyanate compound. 2. The content of the addition polymerization compound is 0.01.
The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition is 3% by weight. 3. A step of forming a polycarbonate resin sheet by melting a polycarbonate resin composition containing a polyhydric alcohol ester compound of a higher fatty acid and an addition polymerization compound obtained by a reaction with an isocyanate compound and extruding it from a die. Before the resin sheet is cured, the optical recording medium includes a step of pressing the preformatted roller and a roller arranged so as to face the preformatted roller to transfer the preformat to one surface of the resin sheet. Substrate manufacturing method. 4. The content of the addition polymerization compound is 0.01.
The method for manufacturing a substrate for an optical recording medium according to claim 3, wherein the weight is 3 to 3 weight. 5. The method for producing a substrate for an optical recording medium according to claim 2, wherein a polycarbonate resin containing a polyhydric alcohol ester of a higher fatty acid is used in addition to the addition polymerization compound. 6. The method for producing an optical recording medium substrate according to claim 5, wherein the polyhydric alcohol is pentaerythritol. 7. A polycarbonate resin containing an ultraviolet absorber in addition to the addition polymerization compound is used.
A method for manufacturing a substrate for an optical recording medium as described above. 8. An optical recording medium substrate comprising a polycarbonate resin composition containing an addition polymerization compound obtained by the reaction of a polyhydric alcohol ester compound of a higher fatty acid and an isocyanate compound.