CN102445717B

CN102445717B - Protection sheet and polarizing plate

Info

Publication number: CN102445717B
Application number: CN201110304898.8A
Authority: CN
Inventors: 峯尾裕
Original assignee: Jiro Enterprise Planning K K
Current assignee: Ewa Co., Ltd.
Priority date: 2010-09-30
Filing date: 2011-09-30
Publication date: 2014-09-03
Anticipated expiration: 2031-09-30
Also published as: KR20120034000A; KR101264833B1; CN102445717A

Abstract

The present invention relates to a protection sheet, and particularly to an island-structure protection sheet which has a matrix phase that comprises heat-resistant acrylic resin as main polymer, and a disperse phase which comprises acrylic resin as main polymer. The refractivity difference between the matrix phase and the disperse phase is less than 0.01. An average particle diameter of the disperse phase is between 1nm and 50nm. Preferably the protection sheet is a polarizer protection sheet which is stacked at two surfaces of the sheet-shaped polarizing component by means of adhesive. The invention aims to provide the protection sheet with the advantages of high heat resistance, high flexibility and high transparency; and particularly a polarizer protection sheet which is suitable for being used for the polarizer.

Description

Screening glass and polarizer

Technical field

The present invention relates to a kind of screening glass and polarizers.

Background technique

In recent years, liquid crystal display device due to thin, light and consumption electric power it is small, be widely used instead of CRT.Specifically, from small articles such as calculator, clocks, until the large items such as automobile measuring instrument, PC screen and TV, are all widely used liquid crystal display device.

The liquid crystal display element of liquid crystal display device is loaded into, with liquid crystal born of the same parents (liquid crystal cell), the polarizer with a pair for being configured at liquid crystal born of the same parents two sides.This polarizer includes the polarization element of sheet, the screening glass with a pair for being configured at this polarization element two sides.The thin slice of structure of the screening glass to protect polarization element, it is however generally that, the tri acetyl cellulose (triacetylcellulose) small by birefringence, the transparency is excellent is (hereinafter, be recorded as " TAC ".) formed.

However, the humidity resistance of this TAC and be not enough, if using the polarizer using TAC as polarization element protective film under high temperature or high humidity, the shortcomings that there will be the declines of the polarizer performance of degree of polarization and tone etc..And TAC can generate phase difference for the incident light of tilted direction.It is continued to develop recently as liquid crystal display enlargement, which significantly impacts viewing angle characteristic.

Therefore, research replaces TAC using heat resistant propylene's acid system's resin.

Specifically, research has island structure screening glass (for example, refering to Japanese Unexamined Patent Publication 2010-70646 bulletin) of the system's resin of acid containing heat resistant propylene as the discrete phase of host polymer and containing acrylic rubber as the dispersed phase of host polymer.

However, the average grain diameter of the acrylic rubber of above-mentioned dispersed phase is relatively large 0.05~0.35 μm in the screening glass of above-mentioned Japanese Unexamined Patent Publication 2010-70646 bulletin, therefore have the problem for being unable to fully ensure the transparency of screening glass.

Patent document 1: Japanese Unexamined Patent Publication 2010-70646 bulletin

Summary of the invention

The present invention complete winner in view of these bad situations, the issue of the present invention is to provide a kind of rich in heat resistance and screening glass and a kind of polarizer with the screening glass flexible and that the transparency is high.

The invention completed to solve the above subject are as follows:

A kind of screening glass, the island structure screening glass with the system's resin of acid containing heat resistant propylene as the discrete phase of host polymer and containing acrylic rubber as the dispersed phase of host polymer；

The discrete phase and the refringence of dispersed phase are 0.01 or less；

The average grain diameter of the dispersed phase is that 1nm or more does not reach 50nm.

In the screening glass; discrete phase contains heat resistant propylene's acid system resin as host polymer; dispersed phase contains acrylic rubber as host polymer; therefore; not only rich in heat resistance and pliability, and discrete phase and the refringence of dispersed phase are 0.01 hereinafter, furthermore; since the average grain diameter of dispersed phase is that 1nm or more does not reach 50nm, therefore the transparency is high.In particular, the average grain diameter due to dispersion layer does not reach 50nm, the high transparency can get.That is, though the particle of the half of theoretically smaller than visible wavelength will not cause adverse effect to the transparency, but actually can because of the visible light of short wavelength side influence and be in gonorrhoea, however, as long as not reaching 50nm as above, it not will receive the influence of the visible light of above-mentioned short wavelength side, and obtain the high transparency.

Also, the content of dispersed phase is preferably 5 mass % or more, 40 mass % or less in the screening glass.Due to more than above-mentioned lower limit value, therefore required pliability can be given full play to, but due in above-mentioned upper limit value hereinafter, therefore the required transparency can be given full play to.

Also, in the screening glass, the length of delay of preferably in-plane is 0nm or more 15nm hereinafter, the length of delay of thickness direction is the above 0nm or less of -15nm.Whereby, it is not likely to produce phase difference in the transmitted light for penetrating the screening glass, therefore, even if having the screening glass of the thin slice of polarizing function used as such as polarizer etc., it may have the advantages of this polarizing function will not be hindered.

Also, the total light transmittance of heat resistant propylene's acid system resin is preferably 90% or more in the screening glass, whereby, the adequately transparency can get.Also, Vicat softening point (Vicat softening point) is preferably 105 DEG C or more 140 DEG C or less.By more than above-mentioned lower limit value, in the screening glass used as such as polarizer, sufficient heat resistance can be played, and by above-mentioned upper limit value hereinafter, then there is to be easy to dissolve heat resistant propylene's acid system resin, easily fabricated when making screening glass.

Above-mentioned heat resistant propylene's acid system's resin preferably has ring structure in main chain.It can make the screening glass that there is the higher effect of heat resistance whereby.

Also, being preferably implemented with delustring (mat) processing to one or two sides in the screening glass.Whereby, there can be " being easy to borrow solid etc. that the face paste through implementing delustring processing is invested other components ".For example, water system solid can be used then in polarization element, the screening glass to be made then to form polarizer in polarization element securely whereby in the face through implementing delustring processing.

Also, preferably having the hard conating laminated on single side in the screening glass, by the hard conating, marresistance can be improved.Also, the hard conating is preferably formed by coating Acrylic coatings, whereby, it can be ensured that the transparency of thin slice.

In addition, the invention also includes to have sheet polarization element and borrow adhesion agent layer laminated on the polarizer of a pair on this polarization element two sides screening glass.

As described above, screening glass of the invention is rich in heat resistance and pliability, and have the effect of that the transparency is high.

Detailed description of the invention

Fig. 1 is the summary section of the screening glass of an implementation form of the invention.

Fig. 2 is the summary section using the liquid crystal display element for the screening glass for having Fig. 1.

Fig. 3 is the summary section using the polarizer for the screening glass for having the other implementation forms of the present invention.

1: screening glass 2: polarization element

3: solid 4: liquid crystal display panel

5: delustring machined layer 6: hard conating

Specific embodiment

Hereinafter, illustrating the screening glass of implementation form of the invention on one side on one side refering to appropriate schema.

The screening glass of this implementation form, the dispersed phase with the system's resin of acid containing heat resistant propylene as the discrete phase of host polymer and containing acrylic rubber as host polymer.In the screening glass, above-mentioned dispersed phase is scattered in above-mentioned discrete phase and forms island structure.Each phase is illustrated below.

Above-mentioned discrete phase contains heat resistant propylene's acid system resin as host polymer.This heat resistant propylene's acid system resin, it is intended that contain polymer of the acrylic monomers such as acrylic acid, methacrylic acid and these derivative as monomer component.This heat resistant propylene's acid system resin, such as can enumerate will be selected from alkyl methacrylates such as cyclohexyl methacrylate, methacrylic acid three-level fourth cyclohexyl, methyl methacrylates；One or more acrylic monomers person of being polymerized of the alkyl acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, isopropyl acrylate, 2-EHA.This heat resistant propylene's acid system resin also includes to be copolymerized acrylic monomer and other monomer components and winner.In the situation of such copolymerization, the containing ratios (copolymerization ratios) of other monomer components is relative to constituting the total monomer ingredient of heat resistant propylene's acid system resin preferably in 60 mass % hereinafter, more preferably in 50 mass % hereinafter, again more preferably below 40 mass %.

Above-mentioned heat resistant propylene's acid system resin, preferably contains polymer of the methyl methacrylate as monomer component.By making heat resistant propylene's acid system resin contain methyl methacrylate as monomer component, the intermiscibility of resulting heat resistant propylene's acid system resin can be promoted.Contain polymer of the methyl methacrylate as monomer component, homopolymer, methyl methacrylate and the copolymer of other monomers of methyl methacrylate etc. can be enumerated.Such as the alkyl methacrylate class other than methyl methacrylate can be enumerated with other monomers of methyl methacrylate copolymer；Alkyl acrylate esters；Alpha-hydroxymethyl alkyl acrylate esters；Styrene, o-methyl styrene, p-methylstyrene, 2, the aromatic ethylene compound class of 4- dimethyl styrene, ethyl styrene, styrene that three-level butylstyrene etc. is replaced through alkyl-substituted styrene, α-methylstyrene, Alpha-Methyl-p-methylstyrene etc. through alpha-alkyl etc.；The unsaturated nitriles such as acrylonitrile, methacrylonitrile；The maleimides classes such as N- phenylmaleimide, N- N-cyclohexylmaleimide (N-cyclohexylmaleimide)；The unsaturated carboxylic acids anhydride such as maleic anhydride；Unsaturated carboxylic acids class such as acrylic acid, methacrylic acid, maleic acid etc..These other monomers; for the viewpoint of pliability and heat resistance for promoting resulting screening glass; preferably alpha-hydroxymethyl alkyl acrylate esters, styrene, through alkyl-substituted styrene, through alpha-alkyl replace styrene, unsaturated carboxylic acid class; more preferably alpha-hydroxymethyl alkyl acrylate esters, styrene, the styrene replaced through alpha-alkyl, unsaturated carboxylic acid class; wherein, then more preferably alpha-hydroxymethyl methyl acrylate, styrene, α-methylstyrene, methacrylic acid.When using alpha-hydroxymethyl alkyl acrylate esters as other monomers and with methyl methacrylate copolymer, further by progress dehydration, due to will form the lactonic ring containing partial polymer main chain, therefore the heat resistance of resulting heat resistant propylene's acid system resin can especially be made to be promoted.These monomer can be used alone a kind or a variety of uses of combination.In the copolymer of such methyl methacrylate and other monomers, the containing ratio of other monomer components is relative to methyl methacrylate, preferably below 50 mass %.

It is above-mentioned can be with other monomers of methyl methacrylate copolymer, preferably alkyl acrylate esters.By using alkyl acrylate esters that can promote the heat resisting temperature of resulting heat resistant propylene's acid system resin as other monomers, and mobility when forming can be made to get higher.In such methyl methacrylate and the copolymer of alkyl acrylate esters, the containing ratio of alkyl acrylate esters monomer component, for the viewpoint for promoting heat resistance, preferably relative to total monomer ingredient more than 0.1 mass % 15 mass % or less, the 14 mass % more preferably more than 0.2 mass % hereinafter, be more preferably 1 mass % or more, 12 mass % or less again.

Above-mentioned alkyl acrylate esters, even methyl acrylate and ethyl acrylate are copolymerized on a small quantity with methyl methacrylate, due to the improved effect of mobility when can also significantly obtain above-mentioned forming, therefore preferably.

Above-mentioned heat resistant propylene's acid system resin, it is possible to use with row's (isotactic) polymethacrylates or to row (syndiotactic) polymethacrylates.Also, heat resistant propylene's acid system resin also can be used directly commercially available product, or manufacture from the commercially available product for becoming predecessor.

The method for manufacturing above-mentioned heat resistant propylene's acid system resin, can be used known method, such as the polymerizations such as casting polymerization, blocky polymerization, suspension polymerisation, polymerisation in solution, emulsion polymerization, anionic polymerisation can be used.Preferably without using the blocky polymerization or polymerisation in solution of suspending agent or emulsifier, being mixed into for small foreign matter can be reduced whereby.Also, the situation of polymerisation in solution, can be used the aromatic hydrocarbon solvents such as toluene.Also, in the situation of bulk polymerization polymerization can be started by free free radical caused by heating or the irradiation of ionization property radioactive ray.Also, be used for the polymerization initiators of polymerization reaction, such as the organic peroxides such as azo-compounds, benzoyl peroxide, lauroyl peroxide, the three-level butyl peroxy -2- ethyl hexanoates such as azobis isobutyronitrile can be used etc..

Also, when being polymerize under the conditions of 90 DEG C or more of temperature, although general using polymerisation in solution, preferably in the polymerization initiators for dissolving in organic solvent, using 10 hours half life temperatures in 80 DEG C or more persons.Such polymerization initiators, specifically, 1 can be enumerated, bis- (the three-level butyl peroxies) -3 of 1-, 3,5- trimethylcyclohexyl, cyclohexane peroxide (cyclohexane peroxide), 2,5- dimethyl -2,5- bis- (benzoyl peroxide (benzoylperoxy)) hexane, 1,1- azo bis- (1- cyclohexanenitrile (1-cyclohexanecarbonitrile)), 2- (amine formyl azo (carbamoylazo)) isobutyronitrile etc..These polymerization initiators above-mentioned polymerization reaction usage amount, relative to 100 mass parts of total monomer for polymerization, preferably 0.005~5 mass parts.

In the polymerization, molecular weight regulator optionally can be used.The generally person used in free radical polymerization can be used in this molecular weight regulator.Specifically, the mercaptan compound such as usable butanethiol, spicy thioalcohol, lauryl mercaptan, mercapto acetic acid 2- ethylhexyl.These molecular weight regulator is preferably added in the concentration range that the molecular weight for making above-mentioned heat resistant propylene's acid system resin becomes be intended to range.

In addition, the manufacturing method of heat resistant propylene's acid system resin, such as the method that the records such as Japanese Patent Publication 63-1964 bulletin can be used.Also, heat resistant propylene's acid system resin, can be copolymerized with monomers more than other 1 types by by alkyl methacrylate and/or alkyl acrylate, 3 yuan or more of copolymer is made.

In above-mentioned 3 yuan or more of copolymer, the other monomer components being copolymerized with alkyl methacrylate and/or alkyl acrylate, such as styrene, α-methylstyrene, o-methyl styrene, p-methylstyrene, o-ethyl styrene, p -ethyl-styrene and to the aromatic ethylene compounds class such as three-level butylstyrene can be used；The unsaturated nitriles such as acrylonitrile, methacrylonitrile, ethyl acrylonitrile；The maleimides classes such as N- methyl maleimide, N-ethylomaleimide, N- N-cyclohexylmaleimide, N- phenylmaleimide；(methyl) acrylic amides such as acrylamide, Methacrylamide, N methacrylamide, butoxy methyl acrylamide (butoxymethylacrylamide), N- propyl methacrylamide；The unsaturated carboxylic acids anhydrides such as maleic anhydride, Yi Kang acid anhydrides (itaconic acid anhydride)；The unsaturated carboxylic acids classes such as acrylic acid, methacrylic acid, crotonic acid, the acrylic acid of alpha-substituted, the methacrylic acid of alpha-substituted, maleic acid；(methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) n-propyl, (methyl) n-butyl acrylate, (methyl) acrylic acid three-level butyl ester, (methyl) the just own ester of acrylic acid, (methyl) cyclohexyl acrylate, (methyl) acrylic acid chloromethyl ester, (methyl) acrylic acid 2- chloroethene ester, (methyl) acrylic acid 2- hydroxyl ethyl ester, (methyl) acrylic acid 3- hydroxypropyl acrylate, (methyl) acrylic acid 2, 3, 4, 5, the own ester of 6- pentahydroxy- and (methyl) acrylic acid 2, 3, 4, unsaturated carboxylic acids alkyl ester class such as tetra- hydroxy pentane ester of 5- etc..

The resin for constituting discrete phase can also further use the non-acrylic resin for heat resistant propylene's acid system resin (hereinafter also referred to as " acrylic resin (a) " other than heat resistant propylene's acid system resin as host polymer.).When this situation, in discrete phase, the content out of the ordinary of heat resistant propylene's acid system's resin and acrylic resin (a), preferably acrylic resin (a) relative to heat-proof acrylic system resin mass ratio (acrylic resin (a)/heat resistant propylene's acid system resin) in 50/50 or less 0.1/99.9 or more.By the mass ratio of adjustment acrylic resin (a) and heat resistant propylene's acid system resin, and the photoelastic coefficient and glass transition temperature (Tg) of resulting screening glass is adjusted.Above-mentioned mass ratio is preferably 0.1/99.9 or more 40/60 hereinafter, more preferably 35/65 or less 0.1/99.9 or more.

The weight average molecular weight (Mw) that above-mentioned heat resistant propylene's acid system's resin converts by the polymethyl methacrylate (PMMA) of hydrogel permeation layer analyzer (GPC), preferably 10,000 or more 40 ten thousand or less, more preferably 40,000 or more 30 ten thousand hereinafter, be more preferably 70,000 or more 20 ten thousand or less again.By the Mw above range for making above-mentioned heat resistant propylene's acid system resin, the intensity of resulting screening glass can be promoted, and the processability and mobility of screening glass forming can be promoted.Also, molecular weight distribution (Mw/Mn) is preferably 1.8 or more 3.0 hereinafter, more preferably 1.8 or more 2.7 hereinafter, again more preferably below 1.8 or more 2.5.

Above-mentioned heat resistant propylene's acid system resin can also be the mixture of different heat resistant propylene's acid of more than two kinds system resins such as composition, the molecular weight of monomer component.At this point, above-mentioned weight average molecular weight means its average value.

The vicat softening temperature (Vicat softening temperature) of above-mentioned heat resistant propylene's acid system resin, preferably at 105 DEG C or more 140 DEG C hereinafter, more preferably at 110 DEG C or more, then more preferably at 120 DEG C or more.Also, the glass transition temperature (Tg) of heat resistant propylene's acid system resin, preferably at 110 DEG C or more, more preferably at 115 DEG C or more, then more preferably at 120 DEG C or more.Melt index (the ASTM D1238 of heat resistant propylene's acid system resin；I condition), for the viewpoint of the intensity of resulting screening glass, preferably at 10g/10 points hereinafter, more preferably at 6g/10 points hereinafter, again more preferably at 3g/10 points or less.

When heat resistant propylene's acid system's resin be without containing aromatic vinyl monomer as monomer component heat resistant propylene's acid system resin (hereinafter also referred to as " heat resistant propylene's acid system resin (1) ".) when, the containing ratio of the acrylic monomer ingredient in heat resistant propylene's acid system resin (1), preferably relative to constituting the total monomer ingredient of heat resistant propylene's acid system resin (1) more than 40 mass %.This acrylic resin (1), such as can be used will be selected from methacrylates such as cyclohexyl methacrylate, methacrylic acid three-level fourth cyclohexyl, methyl methacrylates；1 kind or more of the monomer person of being polymerized of the acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate, isopropyl acrylate, 2-EHA.

The weight average molecular weight of above-mentioned acrylic resin (1) is preferably 50,000 or more 20 ten thousand hereinafter, more preferably below 70,000 or more 15 ten thousand.By this weight average molecular weight above range is made, it can make resulting screening glass that there is excellent intensity, and with excellent shaping processability and mobility when screening glass forming.

And, constitute heat resistant propylene's acid system resin of discrete phase, when merging uses the monomer of system containing aromatic vinyl as heat resistant propylene's acid system resin of monomer component and is free of acrylic resin (1) of the above-mentioned aromatic vinyl system monomer as monomer component, can also further merge using other acrylic resins.When this situation, the content of above-mentioned others acrylic resin is relative to 100 mass parts of total resin for constituting discrete phase, preferably below the mass 20, more preferably below the mass 10.The content of above-mentioned heat resistant propylene's acid system resin (1) is relative to 100 mass parts of total resin for constituting discrete phase, 50 below the mass preferably more than 0.1 mass parts, 40 below the mass more preferably more than 0.1 mass parts, it is further preferred that more than 0.1 mass parts 35 below the mass.And, the content of above-mentioned heat resistant propylene's acid system resin is relative to 100 mass parts of total resin for constituting discrete phase, 99.9 below the mass preferably more than 50 mass parts, and 99.9 below the mass more preferably more than 60 mass parts, then more preferably more than 65 mass parts 99.9 below the mass.By the content above range of the heat resistant propylene's acid system resin made in discrete phase, the heat resistance of resulting screening glass can be promoted.Also, the heat resistance of the screening glass can be made to get higher by the heat resistant propylene's acid system resin for using main chain that there is ring structure.

Above-mentioned dispersed phase contains acrylic rubber as host polymer.This acrylic rubber means rubber of the acrylic monomer as monomer component for containing acrylic acid and methacrylic acid and these derivative etc..Acrylic rubber can be only made of acrylic monomer, or can also be made of acrylic monomer and other monomers.Acrylic monomer can enumerate methyl methacrylate, ethyl methacrylate, n-BMA, allyl methacrylate (allyl methacrylate), methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate etc..Other monomers, such as styrene, α-methylstyrene, 2-methyl styrene, 4- methyl styrene, 2,4- diethyl, 4- butyl phenyl ether ethylene, N can be enumerated, the aromatic ethylene compounds such as TMSDMA N dimethylamine base styrene；The α such as acrylonitrile, methacrylonitrile, dicyan Asia ethylene, β-ethylene unsaturated nitrile compound；The ethylene ester compounds such as vinyl acetate, vinyl propionate；Vinyl ether compounds such as ethyl vinyl ether (ethylvinylether), palmityl vinethene (cetylvinylether), hydroxyl butyl vinyl ether (hydroxybutylvinylether) etc..These other monomers can use individually or mix two or more use.

Crosslinking agent can also be used to be crosslinked in above-mentioned acrylic rubber.Crosslinking agent can for example enumerate sulphur；The organic peroxides such as 2,4- dichlorobenzoperoxides, benzoyl peroxide, two three-level butylperoxydiisopropylbenzenes；The organosulfur compounds such as tetramethylthiuram monosulfide (tetramethylthiuram monosulfide), tetramethylthiuram disulfide (tetramethylthiuram disulfide)；Paraquinonedioxime (p-quinone dioxime), p, the oxime compounds such as p '-dibenzoyl quininie dioxime (p, p '-dibenzoylquinone dioxime)；Polyamines such as hexamethylene diamine amine formic acid esters etc..When using crosslinking agent, optionally add sulphur promotor such as can also be used biphenyl guanidine, two sulphur zinc formate of dimethylamine (zinc dimethyldithiocarbamate), 2- hydrogen sulphur benzothiazole, dibenzothiazyl disulfide.

The average grain diameter of above-mentioned dispersed phase is that 1nm or more does not reach 50nm, and preferably 2nm or more does not reach 50nm, and more preferably 3nm or more does not reach 50nm.If the average grain diameter of dispersed phase does not reach above-mentioned lower limit, the pliability of screening glass has the anxiety of decline.On the contrary, the transparency of screening glass has the anxiety of deterioration if average grain diameter is more than the above-mentioned upper limit.

In the screening glass, the content of above-mentioned dispersed phase relative to above-mentioned screening glass preferably more than 5 mass % 40 mass % hereinafter, 35 mass % are hereinafter, 30 mass % or less more preferably more than 20 mass % again more preferably more than 10 mass %.If the content of dispersed phase does not reach above-mentioned lower limit, the pliability of screening glass has the anxiety of decline.If the content of dispersed phase is more than the above-mentioned upper limit on the contrary, the transparency of screening glass has the anxiety of deterioration.

This dispersed phase can be used with multilayered structure person.The two-layer structure being made of core-shell structure, the three-decker being made of central hard layer and soft layer and outermost hard layer or the four-layer structure further between soft layer and outermost hard layer with intermediate hard layer etc. for example can be used in this multilayered structure.

Above-mentioned two-layer structure, such as it is formed as the core-shell structure being made of core layer and outer shell, wherein the core series of strata are made of rubber-like polymer, which be made of the glassy polymers of acrylic resin.Separately, rubber-like polymer for core layer, as long as being in rubber-like in room temperature, it is then not particularly limited, such as can be used using butadiene as the rubber-like polymer (such as dienite, butadiene-aromatic vinyl copolymer etc.) of principal component or using alkyl acrylate as rubber-like polymer (such as n butyl acrylate styrene, 2-EHA-styrol copolymer etc.) of principal component etc..In addition, preferably using butadiene-styrene copolymer, intensity, productivity and the transparency can be promoted whereby.Also, it is used for the glassy polymers of outer shell, as long as be in vitreous acrylic acid series polymeric compounds in room temperature, then be not particularly limited, such as imperplex, methyl methacrylate methyl acrylate copolymer can be used etc..

Also, the dispersed phase with three layers or more of multilayered structure, the soft layer of rubber-like polymer composition can be lifted, constitute with glassy polymers three layers of hard laminated layer or more and constitutor.Person illustrated by the rubber particles of above-mentioned two-layer structure can be used in rubber-like polymer for soft layer and the glassy polymers for hard layer.

In addition, other than constituting heat resistant propylene's acid system's resin of discrete phase and constituting the acrylic rubber of dispersed phase, other copolymers can also be mixed in the case where effect of the invention will not be damaged.In addition, it is resin that other copolymers, which can for example enumerate the polyenes such as polyethylene, polypropylene (polyolefin),；Polyamide；Polyphenylens sulfide resin；Polyether-ether-ketone resin；The thermoplastic resins such as polyester, polysulfones, polyphenylene oxide (polyphenylene oxide), polyimides, polyetherimide, polyacetals；And thermosetting resins such as phenol resin, melamine resin, silica resin, epoxy resin etc..Other copolymers can individually or mixing is a variety of.In addition, the content of other copolymers, preferably relative to 100 mass parts of discrete phase 20 below the mass.

The screening glass contains ultraviolet absorbing agent in above-mentioned discrete phase.By making the screening glass contain ultraviolet absorbing agent in matrix, can have the effect of that the screening glass is made to be not easy yellow.Also, can inhibit ultraviolet light when the lamination screening glass in sheet polarization element two sides forms polarizer and penetrate polarization element.And further contain this ultraviolet absorbing agent in preferably above-mentioned dispersed phase.By making further to contain ultraviolet absorbing agent in dispersion layer, the dispersing uniformity of the ultraviolet absorbing agent in the screening glass can be promoted, when the lamination screening glass in sheet polarization element two sides forms polarizer, ultraviolet light can be further suppressed and penetrate polarization element.

Above-mentioned ultraviolet absorbing agent can be used benzotriazole based compound, it is other then can be from benzophenone based compound, benzoic ether based compound, threeBased compound, hindered amine (hindered amine) based compound, ethanedioic acid aniline (oxalic acid anilide) based compound, carbonamidine based compound, hydroxybenzoate based compound, nickel series compounds etc. suitably select.These a variety of uses that can be used alone or can also combine.Ultraviolet absorbing agent again, polarizer deteriorates in order to prevent, and preferably wavelength 370nm ultraviolet absorption ability below is excellent, and in order to efficiently use visible light, preferably small to the absorption of the visible light of wavelength 400nm or more.

In addition, as ultraviolet absorbing agent, in the above-mentioned compound enumerated, due to above-mentioned benzotriazole based compound, benzophenone based compound, benzoic ether based compound and threeThe transparency of based compound excellent effect that is high, and preventing polarizer from deteriorating, therefore preferably.It is especially more preferably using the ultraviolet absorbing agent constituted by colouring benzotriazole based compound less and that the transparency is high.

The concrete example of above-mentioned benzotriazole based compound, 2- (2 '-hydroxyls -5 '-tolyl) benzotriazole can be enumerated, 2- [2 '-hydroxyls -3 ', 5 '-bis- (α, α-dimethylbenzyl) phenyl] benzotriazole, 2- (2 '-hydroxyls -3 ', 5 '-two three-level butyl phenyls) benzotriazole, 2- (2 '-hydroxyls -3 '-three-level butyl -5 '-tolyl) -5- chlorination benzotriazole, 2- (2 '-hydroxyls -3 ', 5 '-two three-level butyl phenyls) -5- chlorination benzotriazole, 2- (2 '-hydroxyls -3 ', 5 '-two three-level amyl phenyl) benzotriazole, 2- (2 '-hydroxyls -5 '-three-level octyl phenyl) benzotriazole, 2, 2 '-methylene-bis- [4- (1, 1, 3, 3- tetramethyl butyl) -6- (2H- benzotriazole -2- Base) phenol], the condensation product of methyl -3- [3- three-level butyl -5- (2H- benzotriazole -2- base) -4- hydroxyphenyl] propionic ester and polyethylene glycol, 2- (2- hydroxyphenyl) benzotriazole copolymer, 2- (2 '-hydroxyls -4 '-pungent oxygen phenyl) -2H- benzotriazole, 2- (2H- benzotriazole -2- base) -4- methyl -6- (3, 4, 5, 6- tetrahydrophthalimide ylmethyl) phenol, 2, 2 '-di-2-ethylhexylphosphine oxides (4- three-level butyl -6-2H- benzotriazole base phenol), 2, 2 '-di-2-ethylhexylphosphine oxides (4- three-level octyl -6-2H- benzotriazole base phenol) etc..Commercially available product can then enumerate trade name " KEMISORB279 " (Chemipro corporation), trade name " TINUVIN360 " (BASF JAPAN corporation).

The concrete example of above-mentioned benzophenone based compound can enumerate 2; 4- dihydroxy diphenylketone, 2- hydroxyl -4- methoxybenzophenone, 2- hydroxyl -4- methoxybenzophenone -5- sulfonic acid, 2- hydroxyl -4- positive hexyloxy benzophenone, 2- hydroxyl -4- positive 12-alkoxy benzophenone, 2- hydroxyl -4- benzyloxy benzophenone, bis- (5- benzoyl -4- hydroxyl -2- anisyl) methane, 2; 2 '-dihydroxy -4- methoxybenzophenones, 2; 2 '-dihydroxies -4; 4 '-dimethoxy benzophenone, 2; 2 '; 4,4 '-four hydroxyl benzophenone and 2- hydroxyl -4- methoxyl group -2 '-carboxyl benzophenone etc..Commercially available product can then enumerate trade name " KEMISORB12 ", trade name " KEMISORB111 " (being all Chemipro corporation), trade name " CHIMASSORB81 " (BASF JAPAN corporation).

Above-mentioned benzotriazole based compound and benzophenone based compound, preferably in 300 DEG C, heating in 20 minutes, Mass lost is below 10%.300 DEG C, the Mass lost of heating in 20 minutes, preferably 9% hereinafter, more preferably 8% hereinafter, again more preferably 6% hereinafter, particularly good below 5%.If 300 DEG C, the Mass lost of heating in 20 minutes be more than the above-mentioned upper limit, have the anxiety that can not play sufficient ultraviolet absorption ability.300 DEG C, the Mass lost of heating in 20 minutes in 10% ultraviolet absorbing agent below, can preferably lift 2,2 '-di-2-ethylhexylphosphine oxides [6- (2H- benzotriazole -2- base) -4- (1,1,3,3- tetramethyl butyl) phenol].Commercially available product can then enumerate trade name " KEMISORB12 ", trade name " KEMISORB111 " (being all Chemipro corporation), trade name " CHIMASSORB81 " (BASF JAPAN corporation) etc..

Above-mentioned threeBased compound, such as can be preferably using with 1,3,5- tri-The compound of ring.Specifically, 2- (4,6- biphenyl -1,3,5- tri- can be lifted- 2- base) -5- [(hexyl) oxygroup]-phenol etc..Commercially available product can for example lift trade name " TINUVIN1577 " (BASF JAPAN corporation).

The above-mentioned amine compound that is obstructed, 4- hydroxyl -2 can be enumerated, 2, 6, 6- tetramethyl piperidine, 1- allyl -4- hydroxyl -2, 2, 6, 6- tetramethyl piperidine, 1- benzyl -4- hydroxyl -2, 2, 6, 6- tetramethyl piperidine, 1- (4- three-level butyl -2- cyclobutenyl) -4- hydroxyl -2, 2, 6, 6- tetramethyl piperidine, 4- stearoyl-oxy (stearoyloxy) -2, 2, 6, 6- tetramethyl piperidine, 4- methacryloxy (methacryloyloxy) -1, 2, 2, 6, 6- pentamethvl, 1- benzyl -2, 2, 6, 6- tetramethyl -4- piperidyl maleate, bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) succinate, bis- (1, 2, 2, 6, 6- five Methyl -4- piperidyl) succinate, bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) adipate ester, bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) sebacate, bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) fumarate (fumarate), bis- (1, 2, 3, 6- tetramethyl -2, 6- diethyl -4- piperidyl) sebacate, bis- (1- allyls -2, 2, 6, 6- dimethyl-4-piperidine base) phthalate ester, bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) sebacate, 1, 1 '-(1, 2- ethane diyl (ethanediyl)) bis- (3, 3, 5, 5- tetramethyl piperazinones (tetramethylpiperazinone )), 2- methyl -2- (2, 2, 6, 6- tetramethyl -4- piperidyl) imido grpup-N- (2, 2, 6, 6- tetramethyl -4- piperidyl) propionamide, 2- methyl -2- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) imido grpup-N- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) propionamide, 1- propargyl -4- beta-cyano ethyoxyl -2, 2, 6, 6- tetramethyl piperidine, 1- acetyl group -2, 2, 6, 6- tetramethyl -4- piperidyl-acetic acid esters, trihemellitic acid (trimellitic acid)-ginseng (2, 2, 6, 6- tetramethyl -4- piperidyl) ester, 1- acryloyl group -4- benzyloxy -2, 2, 6, 6- tetramethyl piperidine, bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) dibutyl malonate, bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) dibenzyl phenyl malonic ester, bis- (1, 2, 3, 6- tetramethyl -2, 6- diethyl -4- piperidyl) dibenzyl-malonate, bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) -2- (3, bis- three-level butyl -4- hydroxybenzyl of 5-) -2- n-butylmalonic acid ester, bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) -1, 5- dioxo spiro (dioxaspiro) [5.5] hendecane -3, 3- dicarboxylic ester, bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) -1, 5- dioxo spiro [5.5] hendecane -3, 3- dicarboxylic ester, bis- (1- second 2,2,6,6- tetramethyl -4- piperidyl of acyl group) -1,5- dioxo spiro [5.5] hendecane -3,3- dicarboxylic ester, bis- [2,2 '-[bis- (2,2,6,6- tetramethyl -4- piperidyl) -1, the 3- bis- of 1,3-Hexamethylene (dioxacyclohexane) -5,5- dicarboxylic ester]], bis- (2,2,6,6- tetramethyl -4- piperidyl) -2- [1- Methylethyl] -1,3- bis-Hexamethylene -5,5- dicarboxylic ester]], bis- [2,2 '-[bis- (2,2,6,6- tetramethyl -4- piperidyl) -2- methyl-1s, the 3- bis- of 1,2-Hexamethylene -5,5- dicarboxylic ester]], bis- (2,2,6,6- tetramethyl -4- piperidyl) -2- [2- (3,5- bis- three-level butyl -4- hydroxyphenyl)] Ethyl-2-Methyl -1,3- bis-Hexamethylene -5, 5- dicarboxylic ester, bis- (2, 6, 6- tetramethyl -4- piperidyl) -1, 5- dioxo spiro [5.11] heptadecane -3, 3- dicarboxylic ester, hexane -1 ', 6 '-bis- -4- amine formyloxy (carbamoyloxy) -1- normal-butyls -2, 2, 6, 6- tetramethyl piperidine), Toluene-2,4-diisocyanate ', 4 '-bis- (4- amine formyloxy -1- normal-butyls -2, 2, 6, 6- tetramethyl piperidine), dimethyl-bis- (2, 2, 6, 6- tetramethyl piperidine -4- oxygroup)-silane, phenyl-ginseng (2, 2, 6, 6- tetramethyl piperidine -4- oxygroup)-silane, join (1- propyl -2, 2, 6, 6- tetramethyl -4- piperidyl)-phosphite ester (phosphite), join (1- Propyl -2, 2, 6, 6- tetramethyl -4- piperidyl)-phosphate (phosphate), phenyl-[bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl)]-phosphate (phosphonate), four (2, 2, 6, 6- tetramethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters (butanetetracarboxylate), four (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters, four (2, 2, 6, 6- tetramethyl -4- piperidyl) 1, 2, 3, four formamide of 4- butane (butanetetracarbonamide), four (1, 2, 2, 6, 6- pentamethyl -4- piperazine Piperidinyl) 1,2,3, bis- (9- azepine (the aza) -3- ethyls -8,8 of four formamide of 4- butane, 2- dibutyl amido -4,6-, 10,10- tetramethyl -1,5- dioxo spiro [5.5] -3- hendecyl methoxyl groups (undecylmethoxy))-s- threeBis- (9- azepine -3- ethyl -8,8,9,10,10- pentamethyl -1,5- dioxo spiro [5.5] -3- hendecyl methoxyl groups)-s- three of 2- dibutyl amido -4,6-Four (9- azepine -3- ethyls -8, 8, 10, 10- tetramethyl -1, 5- dioxo spiro [5.5] -3- hendecyl methyl) -1, 2, 3, 4- butane tetracarboxylic acid esters, four (9- azepine -3- ethyls -8, 8, 9, 10, 10- pentamethyl -1, 5- dioxo spiro [5.5] -3- hendecyl methyl) -1, 2, 3, 4- butane tetracarboxylic acid esters, tritriacontyl ginseng (2, 2, 6, 6- tetramethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters, tritriacontyl ginseng (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters, two (tritriacontyl) bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters, two (tritriacontyls) are double (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) 1, 2, 3, 4- butane tetracarboxylic acid esters, 2, 2, 4, 4- tetramethyl -7- oxa- (oxa) -3, two spiral shell of 20- phenodiazine (diazadispiro) [5, 1, 11, 2] heneicosane -21- ketone, 3, 9- bis- [1, 1- dimethyl -2- { ginseng (2, 2, 6, 6- tetramethyl -4- piperidines Epoxide carbonyl (piperidyloxycarbonyl)) butyl carbonyloxy group } ethyl] -2, 4, 8, tetra- oxaspiro of 10- [5.5] hendecane, 3, 9- bis- [1, 1- dimethyl -2- { ginseng (1, 2, 2, 6, 6- pentamethyl -4- piperidines Epoxide carbonyl) butyl carbonyloxy group } ethyl] -2, 4, 8, 10- Four oxaspiros [5.5] hendecane, poly- (2, 2, 6, 6- tetramethyl -4- piperidyl acrylate), poly- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl acrylate), poly- (2, 2, 6, 6- tetramethyl -4- piperidino methyl acrylate), poly- (1, 2, 2, 6, 6- pentamethyl -4- piperidino methyl acrylate), poly- [[bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) itaconate (itaconate)] [vinyl butyl ether]], poly- [[bis- (1, 2, 2, 6, 6- pentamethyl -4- piperidyl) itaconate] [vinyl butyl ether]], poly- [[bis- (2, 2, 6, 6- tetramethyl -4- piperidyl) itaconate] [vinyl Octyl Ether]], it is poly- [[double (1,2,2,6,6- pentamethyl -4- piperidyls) itaconate] [vinyl Octyl Ether]], dimethylsuccinic acid esters -2- (4- hydroxyl -2,2,6,6- tetramethyl-piperidyls) ethanol condensed object, poly- [hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [ethylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethylene -4- piperidyls) imido grpup]], poly- [[1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [[6- (diethyl imido grpup) -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [[6- [(2- ethylhexyl) imido grpup] -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyls) imido grpup]], poly- [[6- [(1,1,3,3- tetramethyl butyls) imido grpup] -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [[6- (cyclohexyl imido grpup) -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], it is poly- [[6-N- mouthfuls of last quinoline bases (morpholino) -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [[6- (butoxy imido grpup) -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyls) imido grpup]], poly- [[6- [(1,1,3,3- tetramethyl butyls) oxygroup] -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [oxygroup [6- [(1- piperidyl) -1,3,5- tri-- 2,4- diyl oxygroup (diyloxy) -1,2- ethane diyl] [(2,2,6, the 6- side tetramethyl -3- oxygroups (oxo) -1,4- piperidyl) -1,2- ethane diyl]] [(3,3,5, the 5- side tetramethyl -2- Oxy-1s, 4- piperidyl) -1,2- ethane diyl]], poly- [oxygroup [6- [(1,1,3,3- tetramethyl butyl) imido grpup] -1,3,5- tri-- 2,4- diyl Oxy-1,2- ethane diyl] [(2; 2,6, the 6- side tetramethyl -3- Oxy-1s; 4- piperidyl) -1,2- ethane diyl] [(3,3; 5; the side 5- tetramethyl -2- Oxy-1,4- piperidyl) -1,2- ethane diyl]], poly- [[6- [(ethyl base) imido grpup] -1; 3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyl) imido grpup]], poly- [[6- [(2,2,6,6- tetramethyl -4- piperidyls) butylimino] -1,3,5- tri-- 2,4- diyl] [(2,2,6,6- tetramethyl -4- piperidyls) imido grpup] hexa-methylene [(2,2,6,6- tetramethyl -4- piperidyls) imido grpup]], 1,6,11- joins [{ 4,6- bis- (N- butyl-N- (2,2,6,6- tetramethyl -4- piperidyl) amido) -1,3,5- tri-- 2- base } amido] hendecane, 1,6,11- ginseng [{ 4,6- bis- (N- butyl-N- (1,2,2,6,6- pentamethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido] hendecane, 1,6,11- ginseng [{ 4,6- bis- (N- octyl-N- (2,2,6,6- tetramethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido] hendecane, 1,6,11- ginseng [{ 4,6- bis- (N- octyl-N- (1,2,2,6,6- pentamethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido] hendecane, poly- methyI-oropvD -3- oxygroup [1 (2,2,6,6- tetramethyl) piperidyl] siloxanes, 1,1 ', 1 "-[1,3,5- tri-- 2,4,6- tri- bases-ginseng [(cyclohexyl imido grpup) -2,1- ethane diyl]]-ginseng [3,3,5,5- tetramethyl piperazines- 2- ketone], 1,1,1- ginseng [polyoxypropylene-{ 4,6- bis- (N- butyl-N- (2,2,6,6- tetramethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido ether methyl] propane, 1,1,1- ginseng [polyoxyethylene -4,6- bis- (N- butyl-N- (2,2,6,6- tetramethyl -4- piperidyls } amido) -1,3,5- tri-- 2- base } amido ether methyl] propane, 1,1,1- ginseng [polyoxyethylene-{ 4,6- bis- (N- butyl-N- (1,2,2,6,6- pentamethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido ether methyl] propane, 1,1,1- ginseng [polyoxypropylene-{ 4,6- bis- (N- butyl-N- (2,2,6,6- tetramethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido ether methyl] propane, 1,1,1- ginseng [polyoxypropylene-{ 4,6- bis- (N- butyl-N- (1,2,2,6,6- pentamethyl -4- piperidyl) amidos) -1,3,5- tri-- 2- base } amido ether methyl] propane, 1,5,8,12- tetra- [4,6- bis- (N- (2,2,6,6- tetramethyl -4- piperidyl)-butylaminos) -1,3,5- tri-- 2- base] -1,5,8,12- teteaazacyclododecanes, 1,5,8,12- tetra- [4,6- bis- (N- (1,2,2,6,6- pentamethyl -4- piperidyl)-butylaminos) -1,3,5- tri-- 2- base] -1,5,8,12- teteaazacyclododecanes etc..

Again, above-mentioned ethanedioic acid aniline based compound for example has a N, and N '-diethyl ethanedioic acid-bis--aniline, 2- ethyoxyl -2 '-ethyl ethanedioic acid-is bis--and aniline, 2- ethyoxyl -5- three-level butyl -2 '-ethyl ethanedioic acid-be bis--aniline and 2- ethyoxyl -5- three-level butyl -2 '-ethyl -4 '-three-level butyl ethanedioic acid-bis--aniline etc..Commercially available product such as trade name " TINUVIN312 " or trade name " TINUVIN315 " (BASF JAPAN corporation).

Again, above-mentioned carbonamidine (formamidine) is that ultraviolet absorbing agent can enumerate N- (4- carboethoxyphenyl)-N '-methyl-N '-phenyl formamidine, N- (4- carboethoxyphenyl)-N '-ethyl-N '-phenyl formamidine, N- (4- carboethoxyphenyl)-N '-ethyoxyl-N '-phenyl formamidine and N- (4- carboethoxyphenyl)-N ', N '-amitraz diphenylurea etc..

Three as above-mentioned ultraviolet absorbing agentCompound can enumerate 2- [4,6- bis- (2,4- xylyl) -1,3,5- tri-- 2- base] -5- octyl oxy phenol, 2- (4,6- biphenyl -1,3,5- tri-- 2- base) -5- [(hexyl) oxygen]-phenol etc..(c) the hydroxybenzoate system light stabilizer of ingredient can be used 2, bis- three-level butyl phenyl -3 ' of 4-, 5 '-two three-level butyl -4 '-hydroxybenzoate, 2, bis- three-level butyl phenyl -3 ' of 6-, 5 '-two three-level butyl -4 '-hydroxybenzoate, positive palmityl -3, bis- three-level butyl of 5- -4-HBA ester and positive octadecyl -3,5- bis- three-level butyl -4-HBA ester etc..

Furthermore as the ultraviolet absorbing agent, preferably using the compound of the straight-chain alkoxy for the branched alkyl or carbon number 4~12 for having both benzene phenolic hydroxyl group and carbon number 4~12.The benzene phenolic hydroxyl group of above-mentioned ultraviolet absorbing agent, since polarity is higher, higher for the compatibility of above-mentioned heat resistant propylene's acid resin with highly polar ester group.The branched alkyl or straight-chain alkoxy of above-mentioned ultraviolet absorbing agent, since polarity is lower and carbochain containing moderate length, the compatibility of the acrylic rubber for being easy to interact with the carbochain is higher.Therefore, above-mentioned ultraviolet absorbing agent is easy to be present in the interface of heat resistant propylene's acid resin and acrylic rubber.Therefore, above-mentioned ultraviolet absorbing agent is homogeneously dispersed in the matrix of the screening glass.As a result, the screening glass can play excellent ultraviolet absorption ability.

Also, the fusing point of above-mentioned ultraviolet absorbing agent is preferably 110 DEG C or more, more preferably 120 DEG C or more, then more preferably 130 DEG C or more.The fusing point of ultraviolet absorbing agent is when less than above-mentioned lower limit, because the relationship of processing is volatilized few in heating melting, and squeeze out outlet etc. contoured exits be not susceptible to ultraviolet absorbing agent be precipitated and agglutination, and then piece forming when it is dirty be not likely to produce, will not barrier sheet the transparency.

For the content of above-mentioned ultraviolet absorbing agent, 0.5 mass % or more, 10 mass % is preferably relative to discrete phase hereinafter, more preferably 1 mass % or more, 9 mass % hereinafter, be more preferably 2 mass % or more, 8 mass % or less again.If the less than above-mentioned lower limit of the content of ultraviolet absorbing agent, resulting screening glass have the anxiety that can not fully absorb ultraviolet light.If the heat resistance of screening glass has the anxiety of decline also, the content of ultraviolet absorbing agent is more than the above-mentioned upper limit.

The screening glass, which ties up to, contains particulate in discrete phase.The material of this particulate be preferably using silica, it is other that the organic materials such as inorganics or cross-linked polymer such as titanium dioxide, aluminium oxide, zirconium oxide, calcium carbonate, kaolin, talcum, firing calcium silicates, water and calcium silicates, alumina silicate, magnesium silicate, calcium phosphate can also be used.Also, silica can be used in the material of particulate, because the mist degree event of screening glass can be reduced preferably.Also, by can reduce screening glass mist degree from the viewpoint of, preferably be the particulate made of the material of silica is surface-treated through organic matter.Organic matter for this surface treatment can enumerate halogenated silanes (halosilane) class, alkoxysilanes, silicon nitrogen (silazane), siloxanes etc..Commercially available product can enumerate such as trade name " sylophobic " (silysia chemical company, Fuji system), " Aerosil200V " (Japanese Aerosil corporation), " AerosilR927V " (Japanese Aerosil corporation).It is described can individually or or be applied in combination.

The average grain diameter of above-mentioned particulate is preferably 0.005 μm or more 2 μm hereinafter, more preferably 0.05 μm or more 1 μm or less.Also, the particle subsystem by from screening glass surface it is outstanding in a manner of be arranged, the maximum projecting height of the particulate is preferably 0.01 μm or more 0.1 μm hereinafter, more preferably 0.02 μm or more 0.05 μm or less.Furthermore particle subsystem is extended (micro- extension) by formation screening glass time slice, and particulate as above projects from the surface and is arranged.

The content of above-mentioned particulate, relative to above-mentioned screening glass, preferably 0.005 mass % or more, 1 mass % hereinafter, more preferably 0.01 mass % or more, 0.5 mass % is hereinafter, particularly good is 0.1 mass % or more, 0.3 mass % or less.

In addition, above-mentioned particulate is not only in discrete phase, above-mentioned particulate can also be contained in dispersed phase.The particulate contained in above-mentioned dispersed phase and the particulate contained in above-mentioned discrete phase can be identical material, maximum projecting height and use level.

The screening glass is the mixtures such as the acrylic rubber that will be formed heat resistant propylene's acid system's resin of discrete phase and form dispersed phase, such as is subject to extrusion molding and constitutes.Herein, which is configured to piece by extension micro- after extrusion.The extension is preferably uniaxial extension.Also, elongation percentage caused by micro- extension is 1% or more 5% or less.In order to realize the elongation percentage, such as extrusion molding can be carried out in following state: the tensile speed stretched to the piece through cooling forming, the extruded velocity fast 0.3% for melted material being squeezed out when compared with extrusion molding.In this way, being easy to be arranged in the state that particulate is prominent from screening glass surface by extension micro- after extrusion, and the easy slip of screening glass can be improved.Also, due to being micro- extension, therefore the transparency of screening glass can be maintained.

The thickness of the screening glass be preferably 15 μm or more 400 μm hereinafter, more preferably 20 μm or more 300 μm hereinafter, again more preferably 40 μm or more 200 μm hereinafter, particularly good is 40 μm or more 150 μm or less.The usability such as the rollback for being set to above range by by the thickness of screening glass, can assigning screening glass sufficient toughness, and can be easy progress screening glass can be promoted.

Be bonded with polarization element and the thickness of manufactured polarizer using the screening glass, preferably 150 μm or more 800 μm hereinafter, more preferably 180 μm or more 700 μm hereinafter, again be more preferably 200 μm or more 600 μm or less.The usability such as the rollback for being set to above range by by the thickness of polarizer, can assigning screening glass sufficient toughness, and can be easy progress screening glass can be promoted.

In the screening glass, the length of delay (Re) of in-plane is preferably 0nm or more 15nm or less.Also, the length of delay (Rth) of thickness direction is preferably the above 0nm or less of -15nm.Herein, the length of delay (Rth) of the length of delay (Re) of above-mentioned in-plane and thickness direction is defined with formula (a) and (b) respectively.

Re1=(nx1-ny1) × d [nm] (a)

Rth1={ (nx1+ny1)/2-nz1 } × d [nm] (b)

Herein, nx1 is the principal refractive index of the in-plane of screening glass.Ny1 is the refractive index in the direction orthogonal with nx1.Nz1 is the principal refractive index of the thickness direction of screening glass.D is the thickness of screening glass.

The screening glass can be used as polarizer screening glass.Specifically, as shown in Figure 1, polarizer can be constituted by a pair of above-mentioned screening glass 1 and the plate polarization element 2 between a pair of screening glass 1.Above-mentioned screening glass 1 and polarization element 2 can be attached by the solids such as aqueous paste (omitting schema).

Have the polarizer of above-mentioned screening glass 1, can be used for liquid crystal display device.Specifically, as shown in Fig. 2, the above-mentioned polarizer of a pair on the two sides of the liquid crystal display panel 3 can be attached at by liquid crystal display panel and respectively to constitute liquid crystal display element.Above-mentioned polarizer and liquid crystal display panel 3, can be attached by solids 4 such as ultraviolet light effect type solids.

In addition, various design alterations can be done the present invention is not limited to above-mentioned implementation form, delustring processing can be imposed in the one or two sides of the screening glass.The effect for being easy to that the face for applying delustring processing is attached at via solid etc. to other materials can be played whereby.In the polarizer of Fig. 3, extinction layer 5 is formed in each single side of a pair of of screening glass 1.And polarization element 2 is equipped between the extinction layer 5 of a pair of of screening glass 1 herein, extinction layer 5 and 2 system of polarization element by water system solid (omitting schema) close to.Delustering agent can be used to be formed in this extinction layer 5, specifically, the coating fluid containing delustering agent can be coated on to the single side of screening glass 1 to form extinction layer 5.Separately, the fine particle of organic or inorganic can be used in delustering agent, for example, silica, talcum, calcium carbonate, settleability barium sulfate, aluminium oxide, Emathlite, clay, magnesium carbonate, carbon black, tin oxide, titanium white (titane white), urea powder resin etc..

Also, as shown in figure 3, the composition that the single side lamination in the screening glass has hard conating 6 can also be used.In terms of the polarizer of Fig. 3, there is hard conating 6 in the area layer not with polarization element 2 with respect to that side of one of a pair of of screening glass 1, the screening glass 1.Whereby, the marresistance of the screening glass 1 can be improved.Also, above-mentioned 6 system of hard conating is formed by coating Acrylic coatings.The transparency of hard conating 6 is also ensured that whereby, can maintain the transparency of screening glass 1.

[embodiment 1]

Hereinafter, being illustrated based on the embodiment of the present invention, the present invention is not limited to the embodiments.

[synthesis example 1]

(heat resistant propylene's acid system resin (A-1):

The synthesis of (Methyl Methacrylate-Styrene-cyclic lactone of methacrylic acid-main chain 6 Yuans))

Modulate the mixed liquor being made of following component: as 35 mass parts of methyl methacrylate of monomer, 8 mass parts of 25 mass parts of styrene, 15 mass parts of alpha-hydroxymethyl methyl acrylate and methacrylic acid, as 20 mass parts of meta-xylene of polymerization solvent, as Nof Corp.'s system " PERHEXA C " (1,1- bis- (three-level butyl peroxy) hexamethylene) 50 mass ppm of polymerization initiators and as the 1500 mass ppm of n-octyl mercaptan of molecular weight regulator.This mixed liquor is continuously fed into the complete of the attached collet (jacket) of inner capacities 3L with the charging rate of 1.5L/hr, polymerization reaction is carried out with 125 DEG C of temperature.Polymerization liquid from above-mentioned reactor is continuously supplied into the high-temperature degassing device for being set to 260 DEG C of temperature and the residence time 2 hours again, carries out the generation reaction for reacting i.e. 6 Yuans cyclic lactones of main chain and the removing of unreacted reactant being dehydrated from the methylol for being bonded to copolymer chain with methoxycarbonyl whereby.Thereafter, by carry out processing obtain heat resistant propylene's acid system resin (A-1).For this heat resistant propylene's acid system resin (A-1), carry out the result of the analysis of acid-base titration, I R spectrum and 13C-NMR, 6 Yuans structural units from methyl methacrylate, the structural units from styrene, main chain cyclic lactones contain each containing ratio of structural units and the structural units from methacrylic acid for 45 mass %, 30 mass %, 18 mass % and 7 mass %.Also, the melt-flow rate value (ASTM-D1238 of heat resistant propylene's acid system resin (A-1)；230 DEG C, 3.8kg loading) it is 1.1g/10 points, glass transition temperature (Tg) is 135 DEG C, refractive index 1.528.

[synthesis example 2]

(heat resistant propylene's acid system resin (A-2):

The synthesis of (methyl methacrylate-α-vinyltoluene-cyclic lactone of methacrylic acid-main chain 6 Yuans))

Prepare the mixed liquor being made of following component: 48 mass parts of methyl methacrylate, 5 mass parts of 6 mass parts of α-vinyltoluene, 8 mass parts of Alpha-hydroxy methyl methacrylate and methacrylic acid as monomer, 40 mass parts of tertiary butyl alcohol as polymerization solvent, 1 as polymerization initiators, 1- bis- (three-level butyl peroxy) -3,3,500 mass ppm of 5- trimethyl-cyclohexane, and the 200 mass ppm of n-octyl mercaptan as molecular weight regulator.With the feed speed of 1.5L/hr, which is continuously fed into the attached collet complete of inner capacities 3L, carries out polymerization reaction in 125 DEG C of temperature.The polymerization liquid of above-mentioned reactor will be come from, be further continuously fed into residence time 2 hours high-temperature degassing devices for being set as 260 DEG C of temperature, carried out 6 Yuans cyclic lactones of main chain whereby and generate reaction and the removing of unreacted reactant.Thereafter, heat resistant propylene's acid system resin (A-2) is obtained by the processing.To heat resistant propylene's acid system resin (A-2) carry out acid-base titration, IR spectrum and 13C-NMR analysis as a result, the structural units from methyl methacrylate, the containing ratio from α-vinyltoluene structural units, the structural units containing 6 Yuans cyclic lactones of main chain and the structural units from methacrylic acid are respectively 80 mass %, 11 mass %, 6 mass % and 3 mass %.Also, melt flow rate values (the ASTM-D1238 of heat resistant propylene's acid system resin (A-2)；230 DEG C, 3.8kg loading) it is 1.5g/10 points, glass transition temperature (Tg) is 132 DEG C, refractive index 1.504.

[synthesis example 3]

(the acrylic rubber particulate of three-decker)

300 mass parts of ion exchange water are packed into the reaction vessel of attached blender, carry out nitrogen substitution on one side, after being warming up to 70 DEG C on one side, add 0.3 mass parts of dihexyl sodium sulfosuccinate, 0.3 mass parts of potassium peroxydisulfate.It is subsequently added into the mixture being made of 23 mass parts of methyl methacrylate, positive 2 mass parts of acrylic acid-N-butyl and 0.03 mass parts of allyl methacrylate as monomer, is kept for 1 hour so that polymerization reaction is completed.Then it after adding the mixture being made of 22 mass parts of n-butyl acrylate, 28 mass parts of styrene and 1.0 mass parts of allyl methacrylate as monomer using 2 hours again, is kept for 2 hours so that reaction is completed.And, it is kept for 1 hour by 22 mass parts of methyl methacrylate and 3 mass parts of n-butyl acrylate as monomer and as after the monomer mixture that is constituted of 0.05 mass parts of n-octyl mercaptan of molecular weight regulator so that reaction is completed using addition in 1 hour again.By resulting latex (latex), after using sodium sulphate to be saltoutd as salting-out agents, dehydration, washing, it is dehydrated and dries, obtain the acrylic rubber (B-1) of powder morphology.The partial size of resulting acrylic rubber particulate (B-1) is 45nm, in addition, refractive index 1.519.

[synthesis example 4]

(synthesis of the acrylic rubber particulate of two-layer structure)

300 mass parts of ion exchange water are added to the reaction vessel of attached blender, after being warming up to 70 DEG C while carrying out nitrogen displacement, 0.3 mass parts of sulphur sodium succinate dihexyl, 0.3 mass parts of potassium peroxydisulfate are added.Then, it after spending 2 hours and adding the mixture that is made of 24 mass parts of n-butyl acrylate, 28 mass parts of styrene and 2.0 mass parts of allyl methacrylate as monomer, is kept for 2 hours and reaction was completed.Then, it after the mixture for spending addition in 1 hour to be made of 45 mass parts of methyl methacrylate and 3 mass parts of n-butyl acrylate as monomer and 0.05 mass parts of n-octyl mercaptan as molecular weight regulator, is kept for 1 hour and reaction was completed.Use sodium sulphate as salting-out agents, after saltouing resulting latex, is dehydrated, is washed, is dehydrated and is dry, obtaining the acrylic rubber particulate (B-2) of the two-layer structure of powder shaped.The partial size of gained acrylic rubber particulate (B-2) is 49nm, refractive index 1.518.

[embodiment 1]

After heat resistant propylene's acid system resin (A-1) 45 mass parts obtained in above-mentioned synthesis example, the 15 weight portion (A-2), 20 mass parts of acrylic rubber particulate (B-1) and (B-2) 20 mass parts are subject to dry mix; use the extruder that T type matrix is housed; the temperature of resin temperature, T type matrix in the cylinder of spiral rotating number, extruder is adjusted on one side; extrusion molding is carried out on one side, obtains the screening glass of embodiment 1 whereby.The surface roughness Ra of the screening glass of the embodiment 1 is 0.04~0.05 μm, and haze value (hazevalue) is 0.8%.The arithmetic average roughness of cutoff value λ c2.5mm, evaluation length 12.5mm that surface roughness is measured according to JIS-B-0601-2001.

[embodiment 2 and 3]

In embodiment 1, the screening glass of embodiment 2 and 3 is in addition to this obtained in a manner of similarly to Example 1 by the type and blend ratio of the contained setting heat resistant propylene's acid system's resin of following table 1 and acrylic rubber.The surface roughness Ra of the screening glass of the embodiment 2 is 0.03~0.04 μm, haze value 0.7%.Also, the surface roughness Ra of the screening glass of embodiment 3 is 0.01~0.02 μm, haze value 0.6%.

[comparative example 1~3]

In embodiment 1; use the acrylic rubber (b-1) that an average grain diameter is 0.5 μm or more as acrylic rubber; and by the blended amount of the type of the contained setting heat resistant propylene's acid system resin of following table 1 and blended amount and acrylic rubber (b-1); in addition to this, the screening glass of comparative example 1~3 is obtained in a manner of similarly to Example 1.The surface roughness of the screening glass of comparative example 1 is that Ra is 3.5 μm, haze value 8.5%.Also, the surface roughness Ra of the screening glass of comparative example 2 is 2.5 μm, haze value 6.5%.Furthermore the surface roughness (Ra) of the screening glass of comparative example 3 is 1.5 μm, haze value 5.2%.

Following evaluations are carried out to screening glass produced above.Evaluation result is shown in following table 1.

It is measured using Suga Test Instruments limited liability company's double beam type haze value calculator (HZ-2).

About the sample of acrylic rubber, refractive index is respectively 1.59 and 1.49 medium, changes ratio on one side, mixes it with resin sample, and the point that gonorrhoea disappears is set as its refractive index (23 DEG C, 550nm).And calculate the difference with " refractive index with heat resistant propylene's acid system resin (A-1, A-2) made of press molding measured with another laser refractometer ".

In the cylindrical vessel heated, a certain amount of synthetic resin heated in specific temperature, pressurizeed, every 10 minutes are measured from the amount of resin that the opening portion for being set to container bottom squeezes out.Test machines are using extrusion type plastometer as defined in JIS K6760, and measuring method is according to JIS K7210.

[table 1]

(research and inquirement etc.)

As shown in Table 1 above, compared to the piece of comparative example 1~3, the haze value of the screening glass of Examples 1 to 3 is minimum, and has haze-free high transparency.

[industrial availability]

Screening glass of the invention can be used as such as light guide plate screening glass rich in heat resistance and pliability and transparency height.

Claims

1. a kind of screening glass, the island structure screening glass with the system's resin of acid containing heat resistant propylene as the discrete phase of host polymer and containing acrylic rubber as the dispersed phase of host polymer；

The discrete phase and the refringence of dispersed phase are 0.01 or less；

The average grain diameter of the dispersed phase is that 1nm or more does not reach 50nm；

The content of the dispersed phase is 20 mass % or more, 40 mass % or less；

The screening glass is extended to form with elongation percentage 1% or more 5% or less through micro- after screening glass constituent extrusion molding；

Surface roughness is 0.01 μm or more 0.05 μm or less；

The length of delay of in-plane is 0nm or more 15nm hereinafter, the length of delay of thickness direction is the above 0nm or less of -15nm；

The total light transmittance of heat resistant propylene's acid system resin is 90% or more, Vicat softening point is 105 DEG C or more 140 DEG C or less.

2. such as claim the 1st screening glass, wherein heat resistant propylene's acid system's resin has ring structure in main chain.

3. one or two sides is implemented with delustring processing such as claim the 1st screening glass.

4. having the hard conating laminated on single side such as claim the 1st screening glass；

The hard conating is formed by coating Acrylic coatings.

5. a kind of polarizer has sheet polarization element and borrows adhesion agent layer laminated on claim the 1st a pair of of screening glass on the polarization element two sides.