JPS59151109A - Polarizing plate - Google Patents

Abstract

PURPOSE:To improve durability, heat stability, and glare preventivity by forming a hardened film made from a UV hardenable polyester acrylate type resin compsn. contg. aggregated silica gel on the surface of an unstretched or monoaxially stretched plastic layer. CONSTITUTION:A hardened film layer 3 made by hardening a UV hardneable polyester acrylate type compsn. contg. silica gel is formed on the surface of a plastic layer 2 of a polarizing material formed by coating the surface of a polarizing film 1 with an unstretched or monoaxially stretched plastic film 2. The obtained polarizing plate is given good scratch resistance by high hardness of the layer 3, and superior glare preventivity by the presence of the aggregated silica gel, and further, good durability and heat stability by the overcoat of the polyester acrylate type hardened resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a polarizing plate that is distinguished by durability, thermal stability +i, scratch resistance, and anti-glare properties.

Polarizing plates are generally made by forming a transparent plastic layer on the surface of a polarizing film, and their use ranges from small items such as conventional desks and watches to automobiles. With the expansion of such fields of use, there is a growing demand for high durability, thermal stability, and other properties required for 15-light plates. has been done.

On the other hand, with the increase in size, there is a demand for better scratch resistance and anti-glare properties for the polarizing plate itself. This is because if the surface of the polarizing plate is scratched during the manufacturing process or mounting of the polarizing plate, the product yield will be significantly lowered, and the appearance and optical characteristics of the display device will also be degraded.

The polarizing plate of the present invention was developed in accordance with such demands, and its gist is to form a plastic layer on the surface of a polarizing film with no stretching or stretching in only one direction. A cured film layer made of a composition containing an ultraviolet curable polyester acrylate resin and a cohesive property/recure is formed on the surface of the glasstic layer of the polarizing base material consisting of 1 to 1.

According to the polarizing plate of the present invention, a cured film layer consisting of a group 1j, V, containing cohesive silica gel in an ultraviolet curable polyester acrylate resin is formed on the glassy layer surface of the polarizing base material. It has the characteristics of excellent scratch resistance due to its large scratch resistance, and excellent anti-glare properties because it scatters light due to the cohesive property (・ζ) of lica gel.

The ultraviolet curable polyester acrylate resin used in the present invention is generally produced by reacting a polyester polyol with an acrylate or methacrylate monomer having a hydroxyl group such as 2-hydroxyethyl (meth)acrylate or 2-hydroxypropyl (meth)acrylate. By using such a resin,
It has been discovered that the composition can be cured by ultraviolet light, and that a cured film layer with high surface hardness and excellent scratch resistance can be obtained.

The silica gel used in the present invention is an agglomeration of several tens to hundreds of colloidal silica particles. The colloidal silica particle size is 30 mμ or less, preferably the average particle size is 5 to 25 FFIμ, and the agglomerated powder particle size is The diameter is 1 to 5 μm, and the apparent specific gravity is about 0.06 to 0.09.

The proportion of ultraviolet curable polyester acrylate resin and silica gel is 0.1 to 35 parts by weight based on 100 parts by weight of resin to improve scratch resistance and prevention. This is desirable since it also provides a dazzling effect. Silica gel is 0. Below IM, the surface hardness of the cured film layer is low and the anti-glare effect is insufficient.
If the amount is more than 5 parts by weight, it is not preferable because the optical properties are deteriorated.

The composition of ultraviolet curable polyester acrylate resin and silica gel contains crosslinking components such as polyisocyanate compounds, as well as ethyl (meth)acrylate and butyl for the purpose of improving film formation and adjusting viscosity during coating. (meth)acrylate, alkyl (meth)acrylate such as isopropyl (meth)acrylate, styrene,
(Meth)acrylonitrile, vinyl ester monomers such as vinyl acetate, functional monomers such as (meth)acrylate, glycidyl methacrylate, etc. can be added, and the range is ~40Mg%. It is something that

Further, the composition may contain additives such as dyes, pigments, and antistatic agents, and may also contain a photoinjection initiator for the resin.

Examples of the initiator include those selected from the group d:, acetophenone, benzophenone, Michler's ketone, benzyl, benzoin, etc., and amines, urea compounds, peroxide v/J, etc. are used in combination as the photosensitizer. You can also do that.

The composition thus self-combined is diluted with an organic solvent that is inert to the plastic layer to be applied and cured, either alone or to a solid content of 20 to 95% by weight, Spinner coat, Krachia coater, reverse coater, spray coater.

For general coating methods such as slot orifice coater - [,
Apply to 1 to 30 V/nf (solid content),
After drying, it is cured by ultraviolet light.

The polarizing base material on which the cured film layer made of such a composition is formed is a plastic layer formed on both sides or one side of a polarizing film by means such as coating or bonding, and which is unstretched or stretched only in one direction. It consists of

Therefore, the polarizing plate of the present invention includes, for example, those having the shapes shown in Figures f41 to f43.

In FIG. 1, 1 is a polarizing film, 2 is a plus deck layer, and 3 is a cured film layer made of the above composition.

2nd N (well, j → 2.2' and 3.3' are film 10
They are formed on both sides respectively.

Figure 3 shows an example of a platform that uses a polarizing plate as a substrate for a plastic liquid crystal cell.
A patterned transparent 4-layer film 4 is formed on homo+IrT of 1, and 3' is used to prevent the film 4 from being disconnected due to scratches.

NfJ fat 4tiM optical film as lri,
Polyvinyl alcohol film, partially formalized polyvinyl alcohol film, ethylene-1! ftM
Dehydration treatment of iodine and/or dichroic dye-based polarizing films and polyvinyl alcohol-based films in which iodine and/or dichroic dyes are oriented in a liquid layer on a hydrophilic sieve molecular thread film such as a saponified film based on a copolymer. Alternatively, the polyvinyl chloride film can be subjected to a four-fermentation process to form a polyvinyl chloride film.
Examples include oriented/hypolyene-based polarizing films, and those having 11 dimensions of t7Klo to 801tm are used.

The plastic layer (thickness is preferably about 10-20+10μ+11) made of polyacrylic (10-20+10μ+11) is made of polyacrylic (thickness preferably about 10-20+10μ+11). Coating and curing resins such as ν1 resins, polyurethane resins, etc., or coating and curing resins such as polynisple film, polycarbonate film, polysulfone film, polyether film, trimethylbentenphyllem, d4 rietherketone film, ) - 1'crylonitrile film 1γ (-Glast film made by stretching only in one direction from an unstretched film with excellent academic transparency, 1r polyester adhesive, polyacrylic adhesive, polyurethane adhesive) J&1ft+?
'l, polyvinyl acetate adhesive [1@I-+I is made by pasting in the kitchen using adhesive means such as adhesives with excellent optical transparency or welding. Therefore, in the place where you put the 1st grade of men's musical instruments on the Lastinoku no V・i (・, the vertical axis or [jf 50-80 (100
Polyester films heat-treated at ~230'C for 5-60 minutes are preferred.

In a polarizing base material composed of such a polarizing film and plastic Ii, the surface of the plastic layer on which the composition is applied and cured is subjected to alkali treatment, corona treatment, sputtering treatment, etc. depending on the material of the glass base material. Surface treatment, long-surface modification treatment such as application of a 7-rankanobbling agent or S1 vapor deposition is advantageous in terms of improving the adhesion between the plastic layer and the cured film layer made of the composition. Otsu.

The thus obtained polarizing plate has good scratch resistance because of the high hardness of the cured film layer, and also has an anti-glare effect because it contains cohesive silica gel.

Further, since the film is made of polyester acrylate resin, it has excellent durability and thermal annealing properties.One embodiment of the present invention will be described below.

Example 7112 was applied on both sides of an iodine-based polarizing film with a thickness of 50 μm.
Uniaxial stretching with a length of 100 μm (stretching rate 300%) L
, polyester film all polyester bonded h *l
Create a polarizing substrate by touching it at I.

One film i/+7 of this substrate was coated with the composition shown in Table 1 using a spinner coater with a line solubility of 10771.
After drying at 100°C for 3 minutes, irradiation was performed with two ozone-type high-pressure mercury lamps (80W/cm, 15α condensing type), and the average coating film thickness was 4 μl. A polarizing plate having a cured film layer was obtained.

The surface hardness of the film layer surface of each polarizing plate was measured using a pencil scratch tester for 5K5401 coating 11 and the results showed that the hardness of the 47 surfaces of the reference example before forming the skin 11 was H. On the other hand, in this embodiment, each IT has a degree of 1 degree of 2 to 4H, and has an anti-glare effect of 7 degrees.

The #J-1 proboscis (!l+■11 (Okibe)) and measurement results are shown in the first table.The light transmittance, polarization ratio, and light reflectance in Table 1 were measured by the rowing method.

Table 1 (Note) ])Nmakor)-TP-2322) manufactured by Nomar Kogyo Co., Ltd.
Colloid, -1-HL, manufactured by Nippon Polyurethane Co., Ltd. 3) Psychoroid≠81 (), manufactured by Fuji Depwinson Chemical Co., Ltd., agglomerated powder particle size 34 μm 4) Irgacure 184, manufactured by Ciba Geigy Co., Ltd.

[Brief explanation of drawings]

Figures 1 to 3 are partially enlarged side views showing examples of the polarizing plate of the present invention.

Claims (1)

[Claims] Plasti, which is either unstretched or stretched only in one direction, is formed on the surface of a polarizing film, and the plasti, which is nine-sided on one side, is coated with UV-curable IJ on the other layer surface.Ester acrylate resin has cohesive properties. An f+, i-base plate having an anti-glare function, characterized in that it is formed by forming a cured film layer made of a composition containing silica gel.