JPH011706A - Materials for forming optical parts - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a material for forming an optical component having excellent transparency, heat resistance, and chemical resistance. The present invention is a material for forming optical components that has excellent transparency, heat resistance, and chemical (solvent) resistance and can be used as a substrate for optical disks and the like manufactured by coating materials on a substrate.

<Prior Art> Polycarbonate (hereinafter abbreviated as PC) and polymethyl methacrylate (hereinafter abbreviated as PMMA) are known as synthetic resins that have excellent transparency and are used as materials for forming optical components. ing. Although each of these synthetic resins has unique properties such as transparency and heat resistance,
Some drawbacks have also been pointed out, and the material is not fully satisfied as a material for forming optical components. For example, PC has the problem of poor chemical resistance, and birefringence caused by aromatic rings has not yet been completely resolved.

Also, PMMA has poor chemical resistance.
It is similar to PC, and history has pointed out that it lacks heat resistance and easily absorbs water. A material that satisfies the various performances required as a material for forming optical components in a well-balanced manner has not yet been found.

Among them, no material has been found that has not only transparency and heat resistance but also chemical resistance, which has caused problems in the production of optical parts that require a coating process using a solvent.

<Purpose of the Invention> In view of the above-mentioned circumstances, the inventors of the present invention have conducted intensive studies in order to find a material for forming optical components that has good transparency, heat resistance, etc., and is also excellent in chemical resistance. The inventors have discovered that by subjecting styrene resin to special treatment, a resin suitable for certain uses can be obtained, and the present invention has been developed.

<Structure of the Invention> The gist of the present invention relates to a material for forming optical components made of a polyvinylcyclohexane resin obtained by hydrogenating the aromatic ring of a styrene resin.

The styrenic resin referred to herein is a styrene homopolymer or a copolymer containing styrene in an amount of 5% or more based on the AO weight and copolymerizable with one or more unsaturated monomers. The copolymerization mode of the copolymer is not limited in any way, but it must be substantially transparent, that is, have a light transmittance of
o% or more, and as long as it is essential, it may be a blend of these styrene resins, including random copolymers, block copolymers, graft copolymers, or styrene homopolymers. .

Examples of unsaturated monomers used in the production of this copolymer include styrenes such as pudomustellene, chlorostyrene, paramethylstyrene, and α-methylstyrene, esters of methacrylic acid and acrylic acid, acrylonitriles,
Mention may be made of butadines.

In addition, polyvinylcyclohexane resin is obtained by nuclear hydrogenation of styrene resin in the presence of a hydrogenation catalyst capable of hydrogenating aromatics. Examples include metals such as nickel, cobalt, ruthenium, rhodium, platinum, and palladium, their oxides, salts, and complexes, and products in which these metals are supported on carriers such as activated carbon, diatomaceous earth, and alumina. Among these, especially
Raney zokel, Raney cobalt, stabilized nickel and ruthenium, rhodium or platinum supported catalysts on carbon or alumina are preferred in terms of reactivity.

Nuclear hydrogenation can be carried out, for example, by converting the above-mentioned styrene resin into cyclohexane, methylcyclohexane, n-octane, decalin,
r-so' in saturated hydrocarbon solvents such as tetralin and naphtha
The catalyst was dissolved in N at a concentration of t.
-10 weight f1% added, pressure 50-λj OKf/ff
The reaction is carried out by reacting at a temperature of 100 DEG to SOO DEG C. for a time of O, S to J hours.

It is desirable that the nuclear hydrogenation rate is 7096 or more, preferably 10 or more.

The molecular weight of the polyvinylcyclohexane resin obtained by hydrogenation depends on the molecular weight of the styrene resin used as the raw material, but it is determined by taking into account both mechanical properties and moldability during melt molding that ηsp/c is 0. 3 to 80 di/11 is preferred. Here, ηep/Ci tetrahydro72in θA
It is the reduced viscosity measured at I/dt solution, θ℃, and is an indicator of molecular weight. By preventing the occurrence and performing molding at a temperature of 230 to 330°C, it is possible to obtain a molded product with excellent transparency and little distortion, which is suitable for optical applications.

<Examples> Examples are shown below, but the present invention is not limited to the following examples unless the gist of the invention is exceeded.

Example ηsp/C and θ, Kuku polystyrene (manufactured by Mitsubishi Monsanto Chemical) was mixed with a stabilized nickel catalyst (i for polystyrene).
Polyvinylcyclohexane resin was obtained by carrying out nuclear hydrogenation using decalin as a solvent in the presence of 11% by weight).UV
What is the nuclear hydrogenation rate due to absorption? It was 7%. This resin, 2
Press molded at 0°C, 0ffiIIIx, 20 pieces x 0
．． Obtain a flat plate with two thicknesses. The various physical properties of this flat plate were compared with those of the raw material polystyrene. The results are shown in Table-7.

Table-/ 1) Difference calorimeter (based on DSC method. Heating speed: 16℃)
/min 2) Tilt the plate to J O', add 5 drops of each solvent, air-dry (at room temperature) and observe the traces of flow.

○ No flow trace This is surprising when compared with the inherent properties of the resins. This property is extremely useful in developing a solvent coating process to obtain information materials such as optical disks, which are formed by depositing various signal media on a substrate.

Claims (1)

[Claims] (1) A material for forming optical parts made of a polyvinylcyclohexane resin obtained by hydrogenating the aromatic ring of a styrene resin.