KR100854388B1 - Compact Disc Using Methylmethacrylate-Acrylonitrile-Butadiene-Styrene Copolymer Resin - Google Patents

Abstract

The present invention is characterized in that a material of a compact disc on which information is recorded is formed of a methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin.

Compact Disc, Methylmethacrylate-Acrylonitrile-Butadiene-Styrene Copolymer Resin

Description

Compact Disc Using Methylmethacrylate-Acrylonitrile-Butadiene-Styrene Copolymer Resin {Methylmethacrylate-Acrylonitrile-Butadiene-Styrene Copolymer Resin}

Field of invention

The present invention relates to a compact disc using methyl methacrylate-acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as MABS resin). More specifically, the present invention relates to a compact disk having an excellent strength, elongation, and data storage property by lowering the manufacturing cost of the compact disk by using an optical disk such as a compact disk (CD) for storing information as a transparent MABS resin.

Background of the Invention

Optical discs such as compact discs (CDs) have been popularly used as a means for storing or reproducing information. In such a compact disc, an information recording surface composed of pits is formed on the surface of a polymethyl methacrylate or polycarbonate disc-type resin substrate, and a reflective film and a protective film are formed in turn on the information recording surface.

When driving an optical disc such as a compact disc, the rotation speed is about 10,000 rpm. Since such driving is performed while the core part is fixed, the impact resistance of the core part of the compact disc is the most important.

Typically, compact discs are made of polycarbonate, and polymethyl methacrylate resin, which is a typical transparent material, cannot be used due to lack of strength. DVD discs are divided into an active area where recording is stored and a dummy area protecting the active area, so that the active recording surface can be changed to polymethyl methacrylate or the like. In the case of the same optical disk, since there is no dummy portion which protects the disk storage layer, its impact strength is more important.

Therefore, compact discs are not only required for impact resistance, but also have excellent data storage capability, no cracks during operation and storage, and low warpage for high speed rotation. As required, polycarbonate resins satisfying these requirements are in the spotlight.

However, the polycarbonate resin has a disadvantage of increasing the manufacturing cost of the compact disk as an expensive resin, and in particular, the fluidity is low, there is a disadvantage in reducing the productivity by requiring high temperature and pressure during processing.

Therefore, in order to solve the above problems, the present inventors have excellent fluidity, strength, elongation and data storage by applying a compact disc as a transparent methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin. In addition, it has begun to develop a compact disk that can lower the manufacturing cost of the compact disk.

An object of the present invention is to develop a new material that can replace the polycarbonate used in the conventional optical disk, and to provide a compact disk applying the same.

Another object of the present invention is to provide a compact disc having excellent flowability, strength and elongation.

Still another object of the present invention is to provide a compact disk having excellent data storage.

Another object of the present invention is to provide a compact disc having excellent transparency.

Still another object of the present invention is to provide a compact disc capable of lowering the manufacturing cost of the compact disc.

Still another object of the present invention is to provide a compact disc having excellent crack characteristics during rotation.

The above and other objects of the present invention can be achieved by the present invention described below.

Summary of the Invention

The present invention is characterized in that a material of a compact disc on which information is recorded is formed of a methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin.

In a specific embodiment of the present invention, the average particle size of the rubber of the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 100 to 200 nm.

In an embodiment of the present invention, the content of rubber added to the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 12 to 18% by weight.

In one embodiment of the present invention, the methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 55 to 70 wt% of methyl methacrylate and 5 to 0 acrylonitrile when using polybutadiene rubber. Weight percent, 12-18 weight percent polybutadiene and 16-25 weight percent styrene.

In another embodiment of the present invention, the methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 40 to 47% by weight of methyl methacrylate when using butadiene-styrene rubber having a styrene content of 25%, 3 to 5 weight percent acrylonitrile, 12 to 18 weight percent butadiene-styrene rubber, and 32 to 38 weight percent styrene.

Detailed Description of the Invention

The methacrylate-acrylonitrile-butadiene-styrene copolymer used in the present invention includes at least one monomer selected from acrylic acid or methacrylic acid, acrylic acid alkyl ester or methacrylic acid alkyl ester, styrene or acrylonitrile resin, and the like. A rubber-added composition of copolymerized materials.

The acrylic acid alkyl ester or methacrylic acid alkyl ester is esters obtained from methacrylic acid or acrylic acid and monohydryl alcohol containing 1 to 8 carbon atoms. Specific examples thereof include acrylic acid methyl ester, acrylic acid ethyl ester, acrylic acid propyl ester, acrylic acid butyl ester, acrylic acid hexyl ester, acrylic acid 2-ethylhexyl ester, or a corresponding methacrylic acid ester. Most preferred are esters.

Examples of the rubber include polybutadiene, butadiene-styrene copolymer, polyisoprene, butadiene-acrylonitrile copolymer, and isobutylene-isoprene copolymer (polybutadiene). isobutylene-isoprene copolymer, ethylene-propylene rubber, acrylic rubber, urethane rubber, silicone rubber, etc. can be used, and among these, polybutadiene or butadiene- Most preferred are styrene copolymers.

These rubber components may be copolymerized with an acrylic resin, but may be blended with an acrylic resin after being copolymerized with a styrene or acrylonitrile resin or the like.

The size of the rubber used in the present invention is suitably about 100 to 200 nm, more preferably about 150 nm. If the size of rubber is less than 100 nm, there is a problem that cracks may occur when the compact disc rotates at high speed due to low impact strength. If the size of rubber exceeds 200 nm, the storage groove is stored in the compact disc. May not be closely adhered to, and data storage stability may be degraded.

In addition, the content of rubber used in this application is 12 to 18% by weight is appropriate. If the rubber content is less than 12% by weight, the impact strength may be reduced, causing cracks. When the rubber content is more than 18% by weight, the heat resistance may be reduced. In addition, warpage may occur due to residual stress during the injection operation due to rapid fluidity decrease.

The methacrylic acid methyl ester and styrene-based or acrylonitrile-based resins may be prepared using two monomers depending on the intended use. Methacrylic acid methyl ester and styrene-based or acrylonitrile-based resins may exhibit excellent transparency and impact strength only when the ratio of the methacrylic acid methyl ester and the styrene-based or acrylonitrile-based resin is properly adjusted to match the refractive index of the rubber.

The component ratio of the acrylic monomer in the transparent MABS resin is preferably 30 to 80%, more preferably 40 to 75%.

In one embodiment of the present invention, the methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 55 to 70% by weight of methyl methacrylate and 5 to 5 acrylonitrile when polybutadiene rubber is used. 0 weight%, 12-18 weight% polybutadiene, and 16-25 weight% styrene.

In another embodiment of the present invention, the methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 40 to 47% by weight of methyl methacrylate when using butadiene-styrene rubber having a styrene content of 25%, 3 to 5 weight percent acrylonitrile, 12 to 18 weight percent butadiene-styrene rubber, and 32 to 38 weight percent styrene.

In one embodiment of the present invention, the MABS resin is polybutadiene rubber latex or butadiene-styrene rubber latex methyl methacrylate, acrylonitrile and styrene in the same composition as the refractive index of each rubber in the conventional graft emulsion polymerization method Are manufactured.

The graft MABS powder may be prepared in a pellet form by adding a conventional additive, and the conventional additive may further include an antioxidant, a lubricant, a stabilizer, an impact modifier, and the like.

In one embodiment of the present invention, the content of polybutadiene or butadiene-styrene rubber latex is lowered to 12-18% (solid content basis), and then methyl methacrylate and acrylonitrile and styrene monomer are equal to the respective rubber refractive index. Graft emulsion polymerization in combination with the composition, followed by coagulation-dehydration-drying, yields a fine powder having a water content of 1% or less. 100 parts by weight of the graft MABS powder (Powder) consisting of 12 to 18% of the rubber content is extruded by adding an antioxidant, a stabilizer and a lubricant, and then a pellet-shaped MABS is prepared.

In another embodiment of the present invention, the content of polybutadiene or butadiene-styrene rubber latex is increased to 40 to 55% (based on solids), and then methylmethacrylate and acrylonitrile and styrene monomer are made to have the same composition as the rubber refractive index. Graft emulsion polymerization in combination with coagulation, followed by coagulation-dehydration-drying to obtain fine graft MABS powder, and in a separate process, methylmethacrylate and acrylonitrile and styrene monomers are suspended or bulk polymerized. MSAN having the same composition as the refractive index of graft MABS is prepared. Next, an antioxidant, a stabilizer, a lubricant, and the like were added to 100 parts by weight of 67 to 83 parts by weight of the prepared MSAN and 33 to 17 parts by weight of the graft MABS powder to prepare a pellet-shaped MABS. The rubber content in the pellet and the composition of methyl methacrylate, acrylonitrile and styrene are the same for both the first method and the second method. The present invention can use both the first method and the second method.

The manufacturing method of the compact disc of this invention is not specifically limited. For example, a compact disc substrate is manufactured by injecting and injecting resin into a commercially available injection molding machine having a predetermined pattern.

The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Example

Example 1

55% by weight of polybutadiene rubber latex content (based on solid content), 33.23% by weight of methyl methacrylate, 2.25% by weight of acrylonitrile, and 9.52% by weight of styrene were prepared as emulsifiers, polymerization initiators, molecular weight regulators, and ions. Emulsion graft polymerization was performed by adding exchanged water, followed by coagulation, dehydration and drying to obtain graft MABS powder having a water content of 1% or less.

Using a separate reactor, 73.8% by weight of methyl methacrylate, 5% by weight of acrylonitrile, 21.2% by weight of styrene, 0.2 parts by weight of an oil-soluble polymerization initiator, 0.1 parts by weight of an organic dispersant, 0.2 parts by weight of a molecular weight regulator, and 120 parts by weight of ion-exchanged water The suspension was subjected to suspension polymerization, followed by dehydration and drying to prepare a bead-shaped MSAN having a molecular weight of about 105,000.

Then, 31% by weight of the prepared graft MABS, 69% by weight of MSAN, 0.3% by weight of antioxidant Irganox 1076 (Ciba), 0.3% by weight of magnesium stearate, 0.2% by weight of stabilizer ethylene bis-stearamid antioxidant The pellet was prepared by extrusion, and a specimen for measuring physical properties and a compact disc were prepared by using an injection molding machine. At this time, the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 61.6 weight% of methyl methacrylate, 4.1 weight% of acrylonitrile, 17 weight% of butadiene rubber, and 17.3 weight% of styrene.

Example 2

MABS resin using a polybutadiene rubber having an average particle diameter of 100 nm, and was carried out in the same manner as in Example 1 except for the average particle diameter of the rubber.

Example 3

The same procedure as in Example 1 was conducted except that a styrene-butadiene copolymer rubber having an average particle diameter of rubber of 150 nm and a styrene content of 25% was used.

Example 4

The same procedure as in Example 1 was carried out except that a styrene-butadiene copolymer rubber having an average particle diameter of rubber of 100 nm and a styrene content of 25% was used.

Comparative Example 1

The same procedure as in Example 1 was carried out except that polymethyl methacrylate resin (PMMA) was used.

Comparative Example 2

Methyl methacrylate-acrylonitrile-butadiene-styrene copolymer resin (MABS) having an average particle diameter of rubber was used, and was carried out in the same manner as in Example 1 except for the average particle diameter of the rubber.

Comparative Example 3

Methyl methacrylate-acrylonitrile-butadiene-styrene copolymer resin (MABS) was used, and the rubber content of the resin was 25% by weight. Except for the content of the rubber was carried out in the same manner as in Example 1.

Comparative Example 4

Methyl methacrylate-acrylonitrile-butadiene-styrene copolymer resin (MABS) was used, and the rubber content of the resin was 10% by weight. Except for the content of the rubber was carried out in the same manner as in Example 1.

Comparative Example 5

Polycarbonate resin was used, CD-2005 of BAYER Co. was used, and the same operation as in Example 1 was measured.

The physical properties of each of the compact discs prepared in Examples and Comparative Examples were evaluated by the following method, and the evaluation results are shown in Table 1.

(1) Notched Izod impact strength: It was measured with an energy of 7.5J in the state of making a notched under the conditions of ASTM D256, and the thickness of the specimen was 3.2mm.

(2) Fluidity: It was measured under the condition of ISO 1133, and the resin produced by PELLET was calculated by converting it into a weight of 10 minutes by measuring the weight of 1 minute with a weight of 10 kg after staying in a cylinder at 220 degrees for 5 minutes.

(3) HAZE: It was measured with a color computer measuring instrument from SUGAINSTRUMENT, Japan, and the results are expressed as total light transmittance and HAZE.

Total light transmittance (%) = (sample transmitted light) / (sample irradiation light) x 100

HAZE (%) = (dispersed transmitted light) / (total light transmittance) x 100

(4) Data storage error rate: 100 molded products manufactured under the above conditions were processed to enable data recording, and then the defective rate was converted during data storage evaluation.

(5) BANDING TEST: Using the DVD MIDI measurement method of Sony Electronics, Japan, the DVD dummy disk portion and the active disk portion were bonded together, and then bent at 90 ° to check for cracking.

(6) Shrinkage: In order to measure the characteristics of the warp, the specimens having a thickness of 1.5 mm and a length of 6 inches each were measured for 24 hours after 23 hours of Aging at 23 degrees.

As shown in Table 1, Comparative Example 1 using the PMMA resin as a compact disc secured transparency, but it is difficult to use due to lack of strength. When the average particle diameter of the rubber exceeded 200 nm and the rubber content exceeded 18% as in Comparative Example 2, the stability of data storage was significantly reduced. In Comparative Example 4 where the content of rubber is less than 12%, data storage stability was secured, but it was difficult to use due to a bending test and a decrease in strength. In Comparative Example 5 using a polycarbonate, the strength and the value of Haze showed excellent values, but it was confirmed that the fluidity was lowered. Due to these characteristics, polycarbonate requires high temperature and pressure during processing, which reduces productivity and improves manufacturing cost.

According to the present invention, the compact disc portion is made of a transparent methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin, which not only has excellent strength, data storage and transparency, but also can lower the manufacturing cost of the compact disc. Has the effect of providing a compact disc.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (6)

In a compact disc in which information is recorded, the compact disc is formed of a methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin, and the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) A compact disc, wherein the average particle size of the rubber of the resin is 100 to 200 nm. delete According to claim 1, wherein the rubber of the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is polybutadiene (polybutadiene), butadiene-styrene copolymer (polyisoprene), polyisoprene ), Butadiene-acrylonitrile copolymer, isobutylene-isoprene copolymer, ethylene-propylene rubber, acrylic rubber, urethane rubber (urethane rubber), silicone rubber (silicon rubber) and mixtures thereof. The compact disc of claim 1, wherein the amount of rubber added to the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 12 to 18 wt%. The method of claim 1, wherein the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 55 to 70% by weight of methyl methacrylate, 5 to 0% by weight of acrylonitrile, 12 to 18 polybutadiene A compact disc comprising weight percent and 16-25 weight percent styrene. The method of claim 1, wherein the methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) resin is 47 to 40% by weight of methyl methacrylate, 5 to 3% by weight of acrylonitrile, butadiene-styrene rubber 12 A compact disc comprising 18 wt% to 38 wt% of styrene.