KR101471228B1 - Resin compositions for optical films and optical films formed by using the same - Google Patents
Resin compositions for optical films and optical films formed by using the same Download PDFInfo
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Abstract
(I) 60 to 98 parts by weight of a first acrylic copolymer comprising an alkyl (meth) acrylate monomer and an acid anhydride monomer or a derivative thereof, and , (ii) 1 to 10 parts by weight of a polycarbonate, and (iii) 1 to 30 parts by weight of a second acrylic copolymer containing at least one alkyl (meth) acrylate monomer, and an optical Film.
The optical film produced using the resin composition for an optical film of the present invention has an optical characteristic suitable for producing an optical film excellent in durability and excellent in optical characteristics and color with an elongation exceeding 200%.
Description
The present invention relates to a resin composition for an optical film and an optical film formed using the same. More particularly, the present invention relates to a resin composition for an optical film, which comprises a first acrylic copolymer, a polycarbonate, and an acrylic copolymer comprising an alkyl (meth) acrylate monomer and an acid anhydride monomer or a derivative thereof And a second acrylic copolymer comprising at least one alkyl (meth) acrylate monomer.
Recently, display technologies using various methods such as a plasma display panel and a liquid crystal display, which replace conventional CRTs, have been proposed and marketed on the basis of the development of optical technology. The demand for polymer materials for such displays is further enhanced. For example, in the case of a liquid crystal display, thinning, lightening, and enlargement of the screen area are promoted, which is a particularly important issue in view of wide viewing angle, high contrast, suppression of image tone change according to viewing angle, and uniform display.
The liquid crystal display is spreading as an optical display device because it has lower power consumption, smaller volume, and easier to carry than a cathode ray tube display. In general, a liquid crystal display has a basic structure in which a polarizing plate is provided on both sides of a liquid crystal cell, and the orientation of the liquid crystal cell is changed according to whether an electric field of the driving circuit is applied or not and the characteristics of light transmitted through the polarizing plate are changed, Visualization is done. At this time, the path of light and the birefringence change depending on the incident angle of the incident light because the liquid crystal is an anisotropic material having two different refractive indices.
Due to such characteristics, the liquid crystal display has a disadvantage that the contrast ratio, which is a measure of how clearly the image looks depending on the viewing angle, is changed and a gray scale inversion phenomenon occurs, .
In order to overcome such disadvantages, an optical compensation film for compensating an optical retardation generated in a liquid crystal cell is used for a liquid crystal display device, and a variety of protective films have been used.
Examples of the material of the stretched birefringent polymer film include polymethyl methacrylate (PMMA), polystyrene (PS), polycarbonate (PC), maleimide copolymer and cyclic polyolefin (cyclic PO). Among them, the polycarbonate, the maleimide copolymer and the cyclic polyolefin are optically anisotropic polymeric materials whose refractive index in the direction of alignment increases when the molecular chains thereof are oriented in a stretched state. On the other hand, polymethyl methacrylate or polystyrene is an optically anisotropic polymeric material in which the refractive index in a direction different from the direction of orientation is increased when the molecular chains are oriented in a stretched state. Polymeric materials which are currently mainly used in optical compensation films for improving the viewing angle of a liquid crystal display include polycarbonates, maleimide copolymers and cyclic polyolefins.
The polarizing plate generally has a structure in which a triacetyl cellulose (TAC) film as a protective film is laminated on a polarizer with an aqueous adhesive composed of a polyvinyl alcohol-based aqueous solution. However, both the polyvinyl alcohol film used as a polarizer and the TAC film used as a polarizer protective film are insufficient in heat resistance and moisture resistance. Therefore, when the polarizing plate made of the above films is used for a long time under an atmosphere of high temperature or high humidity, the degree of polarization is lowered, the polarizer and protective film are separated from each other, or the optical characteristics are lowered.
In addition, the TAC film undergoes a significant change in the in-plane retardation (Rin) and the thickness direction retardation (Rth) which are conventionally possessed by changes in the ambient temperature / humidity environment, and in particular, the retardation change with respect to the incident light in the oblique direction is large. When a polarizing plate including a TAC film having such characteristics as a protective film is applied to a liquid crystal display device, there is a problem that the viewing angle characteristics are changed according to the change of the ambient temperature / humidity environment and the image quality is deteriorated. In addition, the TAC film has not only a large dimensional change ratio due to environmental temperature / humidity environment change, but also a relatively large photoelastic coefficient value, resulting in a change in phase retardation property locally after evaluation of durability in a heat- and moisture- .
Acrylic resin is well known as a material to overcome various disadvantages of the TAC film, and therefore the heat resistance is sufficiently high and the in-plane and thickness direction retardation after stretching is not exhibited.
Therefore, there is a need to develop a new raw material to produce a protective film having better optical properties.
An aspect of the present invention is to provide a resin composition for an optical film having superior optical properties and excellent strength and heat resistance, and the present invention also provides a resin composition for an optical film, And an optical film formed using the resin composition.
(Ii) 60 to 98 parts by weight of a first acrylic copolymer comprising an alkyl (meth) acrylate monomer and an acid anhydride monomer or a derivative thereof, (ii) 1 to 10 parts by weight of a polycarbonate, And (iii) 1 to 30 parts by weight of a second acrylic copolymer comprising at least one alkyl (meth) acrylate monomer.
The first acrylic copolymer preferably further comprises a cyclic (meth) acrylate-based monomer.
The alkyl (meth) acrylate monomer of the first acrylic copolymer is selected from monomers represented by the following formula (I)
In this formula,
R 1 , R 2 and R 3 independently represent hydrogen or a monovalent C 1-30 hydrocarbon group containing or not containing a hetero atom, at least one of R 1 , R 2 and R 3 may be an epoxy group, R 4 is preferably hydrogen or a C 1-6 alkyl group and is preferably selected from the group consisting of methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate and ethyl ethacrylate Is more preferable.
The cyclic (meth) acrylate monomer is substituted with a C 6-12 cycloalkyl group, a C 6-12 aryl group and a C 6-12 aryl group or an aryloxy group, which is optionally substituted with a C 1-5 alkyl group (Meth) acrylate substituted with a group selected from the group consisting of C 1 to C 3 alkyl groups, and cyclohexyl methacrylate, benzyl methacrylate, cyclohexyl acrylate, 2-phenoxyethyl acrylate Methacrylate, methacrylate, 3,3,5-trimethylcyclohexyl methacrylate, phenyl methacrylate and naphthyl methacrylate.
The acid anhydride monomer is preferably selected from polycarboxylic acid anhydrides and is preferably selected from maleic anhydrides represented by the following formula (II), wherein R 5 and R 6 are independently hydrogen or a C 1-6 alkyl group .
The derivatives of the acid anhydride monomers can be selected from the group consisting of N-methylmaleimide, N-ethylmaleimide, N-butylmaleimide, N-phenylmaleimide, N-methylphenylmaleimide, N- ethylphenylmaleimide, N-cyclohexylmaleimide Is an imide-based derivative selected from the group consisting of
Wherein the alkyl (meth) acrylate monomer of the second acrylic copolymer is selected from the monomers represented by the formula (I), wherein R 1 , R 2 and R 3 independently comprise hydrogen or a heteroatom a is a C 1-30 monovalent hydrocarbon group that does not contain 1, R 1, R 2 and R 3, at least one of the date may be epoxy, R 4 is hydrogen or C 1-6 alkyl group, a copolymerizable monomer weight average It is preferable that the molecular weight is 100,000 to 3,000,000, and it is more preferable that the polymer is selected from the group consisting of methyl acrylate, butyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate and ethyl ethacrylate desirable.
The first acrylic copolymer preferably further comprises a styrene-based monomer.
The second acrylic copolymer preferably further comprises at least one monomer selected from the group consisting of aromatic vinyl monomers, acid anhydride monomers or derivatives thereof, and unsaturated organic acid monomers.
The acid anhydride monomer or a derivative thereof is as described above, and the unsaturated organic acid monomer is preferably selected from the group consisting of methacrylic acid, acrylic acid and maleic acid.
The aromatic vinyl-based monomer is preferably selected from a C 1-5 alkyl group or benzene unsubstituted or substituted with halogen, and is preferably at least one selected from the group consisting of styrene,? -Methylstyrene, p-methylstyrene and vinyltoluene Is more preferable.
According to another aspect of the present invention, there is provided an optical film formed using such a resin composition.
It is preferable that the absolute value of the phase retardation and the absolute value of the retardation in the thickness direction of the optical film are 5 nm or less, respectively.
The optical film produced using the resin composition for an optical film of the present invention has an optical characteristic suitable for producing an optical film excellent in durability and excellent in optical characteristics and color with an elongation exceeding 200%.
Hereinafter, the present invention will be described more specifically.
As used herein, the term "copolymer" means that two or more kinds of monomers are contained as repeating units, and the form thereof is not particularly limited, and any kind of copolymer, , It should be understood that the term includes both alternating copolymers, block copolymers, random copolymers and graft copolymers. In the present specification, the term "(meth) acrylate-based monomer" should be understood to mean an acrylate-based monomer or a methacrylate-based monomer.
(I) 60 to 98 parts by weight of a first acrylic copolymer comprising an alkyl (meth) acrylate monomer and an acid anhydride monomer or derivative thereof, (ii) 1 to 10 parts by weight of a polycarbonate, and (iii) And 1 to 30 parts by weight of a second acrylic copolymer containing at least one alkyl (meth) acrylate monomer.
The alkyl (meth) acrylate monomer of the first acrylic copolymer serves to improve the strength and transparency of the optical film. The alkyl (meth) acrylate monomer has the following formula (I):
≪ / RTI > wherein < RTI ID = 0.0 >
R 1 , R 2 and R 3 independently represent hydrogen or a monovalent C 1-30 hydrocarbon group containing or not containing a hetero atom, at least one of R 1 , R 2 and R 3 may be an epoxy group, R 4 represents hydrogen or a C 1-6 alkyl group.
The alkyl (meth) acrylate monomer is preferably selected from the group consisting of methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate and ethyl ethacrylate. In particular, methyl methacrylate (MMA) is more preferable, but is not limited thereto.
The acid anhydride monomer of the first acrylic copolymer of the present invention may be selected from a polycarboxylic acid anhydride and the maleic acid represented by the following formula (II) wherein R 5 and R 6 are independently hydrogen or a C 1-6 alkyl group The acid anhydride is preferably selected from:
The derivatives of the acid anhydride monomers can be selected from the group consisting of N-methylmaleimide, N-ethylmaleimide, N-butylmaleimide, N-phenylmaleimide, N-methylphenylmaleimide, N- ethylphenylmaleimide, N-cyclohexylmaleimide , And it is more preferable to use phenylmaleimide, but it is not limited thereto.
On the other hand, the first acrylic copolymer preferably further comprises a cyclic (meth) acrylate-based monomer. , Said cyclic (meth) acrylate-based monomer is a cyclic aliphatic or aromatic moiety, preferably a C 6-12 cycloalkyl group optionally substituted with a C 1-5 alkyl group, C 6 the (meth) substituted by a group selected from -12 aryl group and the aryl group or aryloxy group the group consisting of alkyl groups of the substituted C 1-3 of the C 6-12 is selected from acrylates, more preferably cyclohexyl meta Acrylate, 2-phenoxyethyl acrylate, 3,3,5-trimethylcyclohexyl methacrylate, phenyl methacrylate and naphthyl methacrylate, in the presence of at least one compound selected from the group consisting of . In particular, cyclohexyl methacrylate is preferably used, but not limited thereto.
In the first acrylic copolymer of the present invention, the alkyl (meth) acrylate monomer, the cyclic (meth) acrylate monomer and the acid anhydride monomer or derivative thereof are contained in an amount of 60 to 90 By weight, 1 to 30 parts by weight, and 1 to 20 parts by weight. When the acid anhydride monomer or its derivative is contained in an amount less than the above range, heat resistance improvement is insignificant. When the acid anhydride monomer is contained in the above range, mechanical strength is lowered. Further, when the cyclic (meth) acrylate monomer is further included in the above range, transparency according to the processing and residence temperature may be improved depending on the polycarbonate content. On the other hand, when the cyclic (meth) acrylate monomer is added, the haze occurrence tends to decrease when the processing temperature is higher, but the heat resistance may decrease when the cyclic (meth) acrylate monomer is added excessively.
In the first acrylic copolymer of the present invention, the alkyl (meth) acrylate monomer, the cyclic (meth) acrylate monomer and the acid anhydride monomer or derivative thereof are contained in an amount of 60 to 90 The mixing amount with the polycarbonate may be determined according to the composition determined within the range of 1 to 30 parts by weight, and 1 to 20 parts by weight.
On the other hand, the first acrylic copolymer is preferably 60 to 98 parts by weight based on 100 parts by weight of the total resin composition. When the amount of the first acrylic copolymer is less than 60 parts by weight, heat resistance may decrease and phase difference may be controlled. When the amount of the first acrylic copolymer is more than 98, there may arise problems in controlling the retardation and improving the stretching strength of the resin.
Further, the first acrylic copolymer may further include a styrene-based monomer. The styrene-based monomer is used for imparting processability, and refers to a compound having a styrene skeleton in its structure. For example, Unit may be used, but it includes styrene substituted with at least one substituent selected from the group consisting of aliphatic hydrocarbon and heteroatom in the benzene ring or vinyl group of styrene, more specifically, C 1-4 alkyl or halogen substituted Units, and more preferably at least one selected from the group consisting of? -Methylstyrene, p-bromostyrene, p-methylstyrene and p-chlorostyrene can be used.
The resin composition of the present invention contains 1 to 10 parts by weight of polycarbonate per 100 parts by weight of the total resin composition. The polycarbonate is added for the purpose of controlling the retardation, and it is added by controlling the content so that the in-plane retardation and the retardation in the thickness direction are -5 nm to 5 nm, preferably -3 nm to 3 nm, and more preferably 0 depending on the first acrylic monomer composition. can do.
The amount of the polycarbonate is adjusted so that the retardation value of the resin composition of the present invention has a value close to 0, depending on the composition of the styrene or the matrix resin. As the amount of polycarbonate increases, the in-plane retardation value (Rin) is also affected, but the retardation value in the thickness direction (Rth) decreases with the content.
On the other hand, the resin composition of the present invention comprises a second acrylic copolymer having a high molecular weight including an alkyl (meth) acrylate monomer, and the (meth) acrylate monomer is a copolymer of the monomer mentioned in the first acrylic copolymer But it is preferable to use one kind selected from the group consisting of methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate, ethyl ethacrylate and butyl acrylate Or more. In particular, methyl methacrylate (MMA) and butyl acrylate are more preferable, but are not limited thereto.
In the present invention, the first acrylic copolymer preferably has a weight average molecular weight of 80,000 to 200,000. When the weight average molecular weight is less than 80,000, the strength of the film formed and stretched can be lowered. Is too high, there is a limit to be obtained through bulk polymerization.
On the other hand, the weight average molecular weight of the second acrylic copolymer is preferably 100,000 to 3,000,000. If the weight average molecular weight is less than 100,000, the second acrylic copolymer may not contribute to improving the strength of the resin. If the weight average molecular weight is more than 3,000,000, Or there is a problem that a gel is generated.
As described above, the second acrylic copolymer having a weight-average molecular weight higher than that of the first acrylic copolymer can be added to produce a resin, thereby imparting strength to the optical film produced thereby. That is, when the melt index (MI) is too low due to a high weight-average molecular weight, color changes may occur depending on the process. Therefore, the melt viscosity is adjusted to an appropriate level to obtain a heat resistance. The stretching strength can be enhanced by mixing the copolymer.
The second acrylic copolymer may further include at least one monomer selected from the group consisting of aromatic vinyl monomers, acid anhydride monomers or derivatives thereof, and unsaturated organic acid monomers.
The aromatic vinyl-based monomer may be selected from a C 1-5 alkyl group or benzene unsubstituted or substituted with halogen, and the aromatic vinyl-based monomer may be selected from the group consisting of styrene,? -Methylstyrene, p-methylstyrene and vinyltoluene It is preferable to use at least one kind selected.
The acid anhydride monomer may be selected from the maleic anhydride used in the first acrylic copolymer and represented by the formula (II) wherein R 5 and R 6 are independently hydrogen or a C 1-6 alkyl group.
The derivatives of the acid anhydride monomers can be selected from the group consisting of N-methylmaleimide, N-ethylmaleimide, N-butylmaleimide, N-phenylmaleimide, N-methylphenylmaleimide, N- ethylphenylmaleimide, N-cyclohexylmaleimide , And it is more preferable to use phenylmaleimide, but the present invention is not limited thereto.
On the other hand, the unsaturated organic acid monomer may be selected from the group consisting of methacrylic acid, acrylic acid and maleic acid.
When the second acrylic copolymer contains an aromatic vinyl monomer, an acid anhydride monomer or a derivative thereof or an unsaturated organic acid monomer, the preferred content thereof is 1 to 30 parts by weight, based on 100 parts by weight of the second acrylic copolymer, 1 to 10 parts by weight of an acid anhydride monomer or a derivative thereof, and 1 to 10 units of an unsaturated organic acid monomer.
When the optical film is produced by using the resin composition of the present invention, the composition is determined in consideration of the heat resistance and the physical properties of the resin in the first acrylic copolymer, and the content of the polycarbonate, A near protective film is produced. On the other hand, the content of the polycarbonate can be adjusted again according to the second acrylic resin composition added to improve the strength of the resin.
The resin composition of the present invention containing the above components preferably has a glass transition temperature of 120 ° C or higher, preferably 123 ° C or higher. In general, an optical film used in a display device such as a liquid crystal display element is required to have high heat resistance because it is easily deformed or damaged by heat generated in a backlight or the like. Since the acrylic copolymer of the present invention has a high glass transition temperature, It is not easily damaged by heat or the like.
The resin composition of the present invention may further contain additives such as colorants, flame retardants, reinforcing agents, fillers, antioxidants, heat stabilizers, ultraviolet absorbers, and the like in addition to the components described above within the range not impairing the object of the present invention .
The copolymer of the present invention can be produced by polymerizing the components by a common copolymer production method used in the related art, for example, by solution polymerization, bulk polymerization, suspension polymerization, emulsion polymerization, etc. Among them, Particularly bulk polymerization is preferred.
On the other hand, the present invention provides, in another aspect, an optical film produced using the resin composition.
The resin composition of the present invention can be produced into an optical film by a film production method well known in the art such as solution casting or extrusion, and the produced film is uniaxially or biaxially stretched for phase difference development. At this time, an improving agent or the like may be added as needed.
The stretching may be longitudinal (MD) stretching, or transverse (TD) stretching, or both. In the case where both the longitudinal direction stretching and the transverse stretching are performed, either one of them may be stretched first, then the stretching may be performed in another direction, or both directions may be simultaneously stretched. The stretching may be performed in one step or in multiple steps.
The stretching is preferably performed at a temperature of (Tg-20) ° C to (T + 30) ° C, more preferably at a glass transition temperature, when the glass transition temperature of the resin composition is Tg . The glass transition temperature refers to a range from the temperature at which the storage elastic modulus of the resin composition begins to decrease and the loss elastic modulus becomes larger than the storage elastic modulus to the temperature at which the orientation of the polymer chain is relaxed and disappears, and a differential scanning calorimeter (DSC ). ≪ / RTI >
The stretching speed is preferably in the range of 1 to 100 mm / min in the case of a universal teating machine (Zwick Z010) and in the range of 0.1 to 2 m / min in the case of a pile stretching machine, The elongation is preferably about 5 to 300%.
The polarizer protective film prepared as described above is preferably made to have a retardation value (Rin) in the plane direction represented by the following formula 1 at 550 nm of -5 nm to 5 nm, preferably -3 nm to 3 nm, more preferably about 0 nm , And the thickness direction retardation value (Rth) expressed by the following [formula 1] is -5 nm to 5 nm, preferably -3 nm to 3 nm, more preferably about 0 nm.
The compensation film formed using the resin composition of the present invention is excellent in transparency, heat resistance, optical characteristics and color, and can have particularly improved stretch strength.
Here, the in-plane retardation value (Rin) refers to a value defined by the following expression (1), and the thickness direction retardation value (Rth) refers to a value defined by the following expression (2).
[Formula 1]
R in = (n x -n y ) x d
[Formula 2]
R th = (n z -n y ) x d
In [Formula 1] and [Formula 2] above,
n x is the refractive index in the direction with the largest refractive index in the plane direction of the film,
n y is the refractive index in the direction perpendicular to the nx direction in the plane direction of the film,
n z is the refractive index in the thickness direction,
d is the thickness of the film.
Hereinafter, the present invention will be described in detail with reference to specific examples.
Example
Example 1
96% by weight of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of 90: 5: 5 of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 2% by weight of polycarbonate, (3 - (3,5-di-tert-butyl-4-methylphenoxy) -pyrrolidone was added to a resin composition consisting of 2% by weight of a copolymer containing methyl methacrylate (MMA) tert-butyl-4-hydroxyphenyl) propionate) was dry-blended, and a heat resistant blend in the form of pellets was prepared by using a co-directional twin-screw extruder.
The dried pellets were dried and then extruded to a thickness of 240 탆 using an extruder including a T-die. The prepared film was subjected to 100% * 100% biaxial stretching at 130 ° C to measure the physical properties of the stretched film. The results are shown in Table 1 below.
Example 2
96% by weight of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of 90: 5: 5 of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 2% by weight of polycarbonate, (3 - (3,5-di-tert-butyl-4-hydroxyphenyl) propyl methacrylate was added to a resin composition consisting of 2 wt% of a copolymer containing 8: ) Propionate) was dry-blended, and then a heat-resistant blend in the form of pellets was prepared using a co-directional twin-screw extruder.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Example 3
88 wt% of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of 90: 5: 4 of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 2 wt% of polycarbonate, (3- (3,5-di-tert-butyl-4-hydroxyphenyl) methacrylate (MMA) -methacrylic acid (MAA) ) Propionate) was dry-blended, and then a heat-resistant blend in the form of pellets was prepared using a co-directional twin-screw extruder.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Example 4
87 wt% of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of 90: 5: 5 of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 3 wt% of polycarbonate, (3,5-di-tert-butylphenol) was added to a resin composition consisting of 10 wt% of a copolymer containing 7: 2: 1 of styrene-maleic anhydride (MMA) Butyl-4-hydroxyphenyl) propionate) was dry-blended, and a heat resistant blend in the form of pellets was prepared by using a co-directional twin-screw extruder.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Example 5
77 wt% of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of 90: 5: 5 of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 2 wt% of polycarbonate, (MMA) -butylacrylate (BA) in an amount of 8: 2 and 20 wt% of a copolymer containing 9: 1 of methyl methacrylate (MMA) -methacrylic acid (MAA) The composition was dry blended with 0.2 phr of pentaerythryol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), and then pelletized Heat resistant blends were prepared.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Example 6
88 wt% of a first acrylic copolymer having a weight average molecular weight of 90,000 and a ratio of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide of 90: 5: 5, 2 wt% of polycarbonate, , 0.2 wt% of pentaerythryol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was dry-blended with a resin composition consisting of 10 wt% of methacrylate (MMA) Thereafter, a heat resistant blend in the form of pellets was prepared by using a twin-screw extruder in the same direction.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Example 7
87% by weight of a first acrylic copolymer having a weight average molecular weight of 90,000 consisting of methyl methacrylate and N-phenylmaleimide in a 90:10 ratio, 3% by weight of polycarbonate, 10% by weight of a methyl methacrylate (MMA) resin having a molecular weight of 130,000 , 0.2 phr of pentaerythryol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was dry-blended and then extruded using a twin-screw extruder To prepare a heat resistant blend in pellet form.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Comparative Example 1
98% by weight of a first acrylic copolymer having a 90: 5: 5 ratio of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, and 2% by weight of a polycarbonate was added to a resin composition comprising pentaerythryol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was dry-blended and a heat resistant blend in the form of pellets was prepared by using a twin screw extruder in the same direction.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Comparative Example 2
(3 - ((3, 3, 4, 5, 6-tetramethylpentane) methacrylate, 5-di-tert-butyl-4-hydroxyphenyl) propionate) was dry-blended, and a heat resistant blend in the form of pellets was prepared using a co-directional twin-screw extruder.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Comparative Example 3
Methyl methacrylate (MMA) having a molecular weight of 80,000, 88 wt% of a first acrylic copolymer having a 90: 5: 5 ratio of methyl methacrylate, cyclohexyl methacrylate and N-phenylmaleimide, 2 wt% 0.2 phr of pentaerythryol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was dry-blended with the resin composition consisting of 10 wt% To prepare a heat resistant blend in pellet form.
A film was prepared in the same manner as in Example 1 except that the composition ratio of the resin composition was changed as described above, and physical properties thereof are shown in Table 1 below.
Experimental Example 1
In the examples of the present invention, the physical properties evaluation methods are as follows, and the physical property evaluation results of the above Examples and Comparative Examples are shown in Table 1 below.
1. Tg (Glass Transition Temperature): Measured using DSC (Differential Scanning Calorimeter) manufactured by TA Instrument.
2. Phase difference value (Rth / Rin): After stretching at the glass transition temperature of the film, Axoscan of Axometrics Inc. was used.
3. TE (Tensile Elongation) Condition: A film of 240 μm before stretching at a rate of 100 mm / min was measured at a temperature near Tg.
4. Haze value (transparency): Haze value was measured using HAZEMETER HM-150 manufactured by Murakami color Research Laboratory.
Experimental Example 2
In the present invention, the resin composition thus prepared was dissolved in tetrahydrofuran, and the weight average molecular weight of the second acrylic copolymer contained in each resin composition was measured by gel permeation chromatography (GPC). The results are shown in Table 2 Respectively.
Claims (20)
In this formula,
R 1 , R 2 and R 3 independently represent hydrogen or a C 1-30 monovalent hydrocarbon group containing or not containing a hetero atom,
And R 4 represents hydrogen or an alkyl group of C 1 .
In this formula,
R 1 , R 2 and R 3 independently represent hydrogen or a C 1-30 monovalent hydrocarbon group containing or not containing a hetero atom,
R 4 is a resin composition represents a hydrogen or C 1.
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| US10633530B2 (en) | 2016-08-09 | 2020-04-28 | Lg Chem, Ltd. | Resin composition for optical material and optical film comprising the same |
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| CN105531315B (en) | 2013-07-08 | 2018-01-30 | Lg化学株式会社 | Resin blend |
| WO2015005631A1 (en) * | 2013-07-08 | 2015-01-15 | 주식회사 엘지화학 | Resin mixture |
| US10882989B2 (en) | 2013-07-15 | 2021-01-05 | Lg Chem. Ltd. | Resin blend |
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| KR20120040964A (en) | 2012-04-30 |
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