JP2829344B2 - Cleaning and coating protective agent for optical discs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for cleaning a disk surface such as a compact disk (CD), a laser vision disk (LD), etc., in which a signal is read from the disk surface by using a laser beam. Regarding protection.

"Conventional technology" A spot beam of a laser beam is applied to a disc,
The optical information reproducing method, which reads out a signal recorded by fine pits on a disc by detecting the amount of reflected or transmitted light, has a remarkably high recording density, and the reproduced image and sound quality are excellent. It has a characteristic that it is more resistant to scratches and dirt than a conventional analog record.

However, since the optical disc material is a plastic such as polycarbonate resin (PC), polymethyl methacrylate (PMMA), or polyvinyl chloride (PVC), it can be damaged by long-term use, causing dirt to adhere to it, sometimes causing sound skipping during playback, It has also been found that there are obstacles such as noise entering.

Particularly, in the case of LDs such as commercial karaoke disks, since the environment is overworked by hardware, there are many cases in which reproduction is disturbed due to dirt or scratches in spite of the non-contact reading method.

At present, various types of care products for CDs and LDs are on the market, but these are mainly based on surfactants and lower alcohols, and only act to remove light stains such as hand marks and fingerprints. However, it has no function of protecting the disk surface from scratches or repairing the scratches.

[Problems to be Solved by the Invention] The present invention cleans the surface of an optical disc and leaves a protective film thereon to prevent scratches and dirt from adhering, thereby recovering a non-reproducible disc or preventing a defective reproduction disc from occurring. The purpose is to:

"Means for Solving the Problems and Their Functions" In order to solve the above problems and achieve the above objects, the present invention is characterized by using an organopolysiloxane as an essential component, and the present invention has a viscosity of 5 to 5. A cleaning and coating protective agent for optical disks, characterized in that fine particles for polishing are dispersed in an emulsion comprising 0.5 to 20% by weight of a 3000 Cst organopolysiloxane, a surfactant, a solvent and water.

The organopolysiloxane remains on the disk surface to form a uniform coating, which provides good slip on the disk surface to prevent scratches and penetrate fine scratches to provide optical homogeneity. In addition, it is made hard to adhere, and even if it adheres, it can be easily removed with a cloth or nonwoven fabric.

The organopolysiloxane may be used by dissolving it in a solvent. However, it is more advantageous to add a surfactant to use as an aqueous emulsion from the viewpoints of safety and cost for the disc material.

Further, an inorganic or organic fine powder having a polishing action and an adsorptive property may be blended to have an effect of removing fine scratches on the disk surface.

At this time, the organopolysiloxane also has the effect of preventing creaking of the powder, improving workability and facilitating removal of the powder after the work.

If necessary, an aluminum corrosion inhibitor, an anionic, nonionic or cationic antistatic surfactant or alcohol may be added.

The organopolysiloxane, which is an essential component in the present invention, preferably has good slip and is preferably dimethylpolysiloxane in the range of 5 to 3,000 Cst, but may be of a type modified with methylphenyl polysiloxane, polyether, amino group, or the like. Organopolysiloxane may be used.

The compounding amount is preferably about 0.5 to 20% by weight, and those exceeding 20% by weight are sticky and uneconomical. 0.5w
Less than t% has little effect.

The present invention may be used as it is in a liquid state, or may be filled in a can with a liquefied gas and used as an aerosol. Further, it may be used by impregnating it in a nonwoven fabric or the like.

A small amount of the liquid of the present invention is taken out on a disk, spread with a soft cloth or nonwoven cloth, and wiped off to obtain a glossy clean disk surface with residual slippage of organopolysiloxane. The organopolysiloxane film on the disk surface has the effect of reducing noise and scratches without affecting the reading of ordinary laser light, preventing the scratches from sticking for a long time due to the slip, and protecting the disk surface. give.

"Examples and Comparative Examples" Example 1. Amino-modified polysiloxane 10 wt% oleic acid morpholine salt 3 wt% kerosene 20 wt% perlite (average particle size 3μ) 15 wt% purified water 52 wt% 2. Dimethylpolysiloxane 30 Cst 5 wt% trioleic acid Ethanolamine salt 2 wt% Kerosene 15 wt% Microcrystalline cellulose 10 wt% Purified water 68 wt% Comparative Example 1. Sodium dodecylbenzenesulfonate 1 wt% Isopropyl alcohol 5 wt% Purified water 75 wt% 2. CD / LD cleaner (commercially available) (surfactant An aerosol is a composition consisting of water, alcohol and water.) Test method Commercial karaoke discs (LD) that generate noise on the image or cause the image to fly due to the adhesion of scratches and dirt are described in Examples and Comparative Examples. Each solution was cleaned by applying it to a small amount of clean cloth.

Each disc was reproduced to examine the state of noise and image skipping.

Test results In the examples containing polysiloxanes, the effect of reducing image noise and eliminating image skipping was observed. However, in the comparative example containing no polysiloxanes, the effect was not exhibited. The state has not changed.

Further, in the case of the disk treated in the example over a long period of time, the disk treated in the example showed slipping and the increase of scratches was small, but the disk of the comparative example had less slipping and the scratch increased as much as the untreated one.

[Effect of the Invention] The cleaning and coating protective agent of the present invention prevents the adhesion of scratches and dirt by cleaning the surface of an optical disk and leaving a protective film, thereby recovering an unreproducible disk or generating a defectively reproduced disk. This has the effect of preventing that.

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Claims (3)

(57) [Claims] 1. A cleaning and coating protective agent for optical discs, characterized in that fine particles for polishing are dispersed in an emulsion comprising 0.5 to 20% by weight of an organopolysiloxane having a viscosity of 5 to 3000 Cst, a surfactant, a solvent and water. 2. The cleaning and coating protective agent for optical disks according to claim 1, wherein the organopolysiloxane is dimethylpolysiloxane and the fine particles for polishing are microcrystalline cellulose. 3. The cleaning and coating protective agent for optical disks according to claim 1, wherein the organopolysiloxane is an amino-modified polysiloxane and the fine particles for polishing are pearlite fine particles.