Resin composition, film, polarizing sheet, and sunglasses

Abstract

To provide a resin composition which enables provision of a film that can effectively suppress dirt of a first roll and shark skin of a film surface when the film is produced, a film, a polarization sheet, and sunglasses.SOLUTION: A resin composition contains a polyamide resin including an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, a polyetheramide elastomer, and a release agent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resin composition, a film, a polarizing sheet, and sunglasses, and more particularly to a resin composition containing a polyamide resin as a main component. [Background technology]

[0002] Polyamide resins have excellent mechanical properties such as rigidity and strength, as well as heat resistance, and are therefore used in a wide range of applications, including electrical and electronic applications, automobiles, machinery, and building materials (Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-129271 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-001906 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-131977 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, polyamide resins are used in a wide variety of fields, but they are generally poor in transparency and have not been used in applications where transparency is required. Under these circumstances, the present inventors have investigated the use of polyamide resins for transparent applications such as protective films for polarizing films, etc. However, when polyamide resins are molded into films, there are cases in which the rolls are contaminated during film production, and the film surface develops a shark skin pattern. The present invention aims to solve these problems by providing a resin composition capable of providing a film that can effectively prevent contamination of the first roll during film production and prevent the film surface from becoming shark skin-like, as well as a film, a polarizing sheet, and sunglasses. [Means for solving the problem]

[0005] In view of the above problems, the present inventors have conducted research and found that the above problems can be solved by blending a polyetheramide elastomer and a release agent with a specific polyamide resin. Specifically, the above problems were solved by the following means. <1> A resin composition comprising a polyamide resin containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, a polyetheramide elastomer, and a mold release agent. <2> The aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms includes a sebacic acid unit and / or a dodecanedioic acid unit. <1> The resin composition according to claim 1. <3> the alicyclic diamine constituting the alicyclic diamine unit contains two substituted or unsubstituted cyclohexane rings; <1> or <2> The resin composition according to claim 1. <4> The alicyclic diamine unit includes a unit represented by formula (PA-1): <1> ~ <3> The resin composition according to any one of the above. [ka] (In formula (PA-1), R 1 are each independently an alkyl group having 1 to 5 carbon atoms, and each n1 is independently an integer of 0 to 3. * is a bonding site to another unit or a terminal group. <5> The polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block. <1> ~ <4> The resin composition according to any one of the above. <6> the polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block; <5> The resin composition according to claim 1. <7> the content of the polyamide resin in the resin composition is 80.0 to 99.9% by mass, the content of the polyetheramide elastomer is 20.0 to 0.1% by mass, and the content of the release agent is 0.001 to 10% by mass (however, the total of the polyamide resin, polyetheramide elastomer, and release agent does not exceed 100% by mass); <1> ~ <6> The resin composition according to any one of the above. <8> The release agent contains at least one selected from the group consisting of fatty acid esters, fatty acid amides, and polyalkylene glycols. <1> ~ <7> The resin composition according to any one of the above. <9> The polyamide resin is an amorphous resin. <1> ~ <8> The resin composition according to any one of the above. <10> The haze of the resin composition when molded into a film with a thickness of 300 μm is 3.0% or less. <1> ~ <9> The resin composition according to any one of the above. <11> When the resin composition is molded into a film having a thickness of 300 μm, the total light transmittance is 80% or more. <1> ~ <10> The resin composition according to any one of the above. <12> It is used as a protective film for polarizing sheets. <1> ~ <11> The resin composition according to any one of the above. <13> the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms contains a sebacic acid unit and / or a dodecanedioic acid unit, the alicyclic diamine unit includes a unit represented by formula (PA-1), the polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block; the polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block; the content of the polyamide resin in the resin composition is 80.0 to 99.9% by mass, the content of the polyetheramide elastomer is 20.0 to 0.1% by mass, and the content of the release agent is 0.001 to 10% by mass (however, the total of the polyamide resin, polyetheramide elastomer, and release agent does not exceed 100% by mass); the release agent contains at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a polyalkylene glycol; the polyamide resin is an amorphous resin, The resin composition has a haze of 3.0% or less when molded into a film with a thickness of 300 μm, The resin composition has a total light transmittance of 80% or more when molded into a film with a thickness of 300 μm, It is used as a protective film for polarizing sheets. <1> ~ <12> The resin composition according to any one of the above. [ka] (In formula (PA-1), R 1 are each independently an alkyl group having 1 to 5 carbon atoms, and each n1 is independently an integer of 0 to 3. * is a bonding site to another unit or a terminal group. <14> <1> ~ <13> A film formed from the resin composition according to any one of the above. <15> <14> A polarizing sheet comprising the film according to claim 1 and a polarizing film. <16> <15> Sunglasses comprising the polarizing sheet according to claim 1. [Effects of the Invention]

[0006] It has become possible to provide a resin composition capable of providing a film that can effectively prevent contamination of the first roll during film production and the film surface from becoming shark skin-like, as well as a film, a polarizing sheet, and sunglasses. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram illustrating the production of a film according to the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a layer structure of the heat-bent molded body of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only this embodiment. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the upper and lower limits. Furthermore, any combination of the upper and lower limit values ​​of the numerical values ​​in this specification is an example of this embodiment. In this specification, various physical properties and characteristic values ​​are those at 23°C unless otherwise specified. In the description of groups (atomic groups) in this specification, when a notation does not specify whether they are substituted or unsubstituted, it includes both groups (atomic groups) that have no substituents and groups (atomic groups) that have substituents. For example, the term "alkyl group" includes not only alkyl groups that have no substituents (unsubstituted alkyl groups) but also alkyl groups that have substituents (substituted alkyl groups). In this specification, when a notation does not specify whether they are substituted or unsubstituted, it is preferable that they be unsubstituted. Examples of the substituent herein include, preferably, a halogen atom, a cyano group, a nitro group, a hydroxy group, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a heterocyclic group, a heterocyclic oxy group, an alkenyl group, an alkylsulfanyl group, an arylsulfanyl group, an acyl group, or an amino group; more preferably, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, an alkenyl group, or an acyl group; even more preferably, an alkyl group, an aryl group, an aryloxy group, or an alkenyl group; and even more preferably, an alkyl group. The formula weight of these substituents is preferably 15 or more and preferably 200 or less. For example, the formula weight of a methyl group (-CH3) is 15. These substituents may further have a substituent, but it is preferable that they have no substituent.

[0009] The term "film" as used herein refers to a generally flat molded body that is thin relative to its length and width, and includes sheets. The term "film" as used herein may be either a single layer or a multilayer, with a single layer being preferred. If the measurement methods, etc. described in the standards shown in this specification change from year to year, they will be based on the standards in effect as of January 1, 2024, unless otherwise specified. If the measurement methods, etc. described in the standards shown in this specification are abolished as of January 1, 2024, they will be based on the standards in effect at the time of abolition. Figures 1 and 2 may not be to scale and may not correspond to reality.

[0010] The resin composition of the present embodiment is characterized by containing a polyamide resin containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, a polyetheramide elastomer, and a release agent. By adopting such a constitution, a resin composition can be obtained that can provide a film that can effectively prevent staining 15 on first roll 12 during film production and prevent the film surface from becoming shark skin-like. The resin composition of this embodiment is produced, for example, using an apparatus as shown in Fig. 1. That is, Fig. 1 shows a schematic diagram of the production of the film according to the present invention, in which 10 indicates raw materials, 11 indicates a die, 12 indicates a first roll, 13 indicates a second roll, 14 indicates a third roll, and 15 indicates dirt. Since the first roll 12 is in contact with the film raw material 10 for a short time, it is thought that stains 15 are more likely to occur on the first roll 12 than on the second roll 13. However, since the raw material 10 is cooled and solidified by the time it comes into contact with the third roll 14, stains on the third roll 14 are hardly generated. It is very important to improve the roll contamination 15 of both the first roll 12 and the second roll 13 in order to obtain a film with good appearance. Contamination of the first roll is presumably caused by, for example, polyamide resin remaining in the die during extrusion molding and adhering to the metal wall, resulting in decomposition of the polyamide resin. Shark skin on the film surface is presumably caused by the tendency of polyamide resin to adhere to the metal inner wall of the die, resulting in locally uneven resin flow within the die. The inventors' investigations have revealed that the use of a polyetheramide elastomer and a release agent reduces the likelihood of polyamide resin adhering to the metal inner wall of the die, thereby effectively preventing contamination of the first roll and the shark skin on the film surface. This is presumably because the incorporation of a polyetheramide elastomer and a release agent effectively prevents the adhesion of components derived from aliphatic dicarboxylic acid units and aminocarboxylic acid units having 7 to 20 carbon atoms to the roll during film production. Furthermore, the release agent is more likely to be present on the metal wall side of the die in the resin composition, resulting in improved releasability between the roll surface and the inner surface of the die and the film raw material. It is presumed that by using a polyetheramide elastomer and a release agent in this manner, a resin composition has been obtained that can provide a film that can effectively prevent contamination of the first roll during film production and the film surface from becoming shark skin-like. The details of this embodiment will be described below.

[0011] <Polyamide resin containing alicyclic diamine units and aliphatic dicarboxylic acid units having 7 to 20 carbon atoms> The resin composition of the present embodiment contains a polyamide resin containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms (sometimes referred to as "polyamide resin (A)" in this specification). The alicyclic structure of the polyamide resin (A) improves the transparency of the polyamide resin itself, and the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms increases the compatibility with polyalkylene glycol, improving the transparency of the resulting resin composition.

[0012] In this embodiment, the alicyclic diamine constituting the alicyclic diamine unit is preferably a diamine containing a five-membered alicyclic ring and / or a six-membered alicyclic ring. The five-membered ring and / or the six-membered ring may or may not have a substituent. Furthermore, the alicyclic diamine is preferably composed only of an aliphatic hydrocarbon group containing an alicyclic structure, except for the terminal amino group. The alicyclic diamine unit more preferably contains two to three or more substituted or unsubstituted cyclohexane rings, and further preferably contains two substituted or unsubstituted cyclohexane rings, per unit. The alicyclic diamine unit preferably does not contain a carbon-carbon double bond or a carbon-carbon triple bond. The molecular weight of the alicyclic diamine constituting the alicyclic diamine unit is preferably 195 or more, more preferably 200 or more, and is preferably 500 or less, more preferably 400 or less, and even more preferably 300 or less.

[0013] In this embodiment, it is more preferable that the alicyclic diamine unit contains at least one type represented by formula (PA-0). [ka] (In formula (PA-0), each R is independently a substituent, each n is independently an integer of 0 to 5, L is a single bond or a divalent linking group, and * is a bonding site to another unit or a terminal group.) In formula (PA-0), each R is independently a substituent, and is preferably an aliphatic group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 6 carbon atoms, even more preferably a linear or branched alkyl group having 1 to 6 carbon atoms, still more preferably a methyl group, an ethyl group, or a propyl group, and even more preferably a methyl group. In formula (PA-0), n's are each independently an integer of 0 to 5, preferably an integer of 1 or greater, and more preferably an integer of 4 or less, more preferably an integer of 3 or less, even more preferably an integer of 2 or less, and even more preferably an integer of 1 or less. In formula (PA-0), L represents a single bond or a divalent linking group, more preferably a single bond or a divalent aliphatic hydrocarbon group, more preferably a single bond or a divalent alkylene group, even more preferably a single bond or an alkylene group having 1 to 3 carbon atoms, still more preferably a single bond, a methylene group, an ethylene group, or an isopropylene group, and even more preferably a methylene group. * is a bonding site with another unit or a terminal group. That is, it is usually bonded to -C(=O)- to form an amide bond together with NH in formula (PA-0), or to a hydrogen atom to form a terminal amino group together with NH in formula (PA-0), or to a terminal group.

[0014] In this embodiment, the alicyclic diamine unit is more preferably represented by formula (PA-1). [ka] (In formula (PA-1), R 1 are each independently an alkyl group having 1 to 5 carbon atoms, and each n1 is independently an integer of 0 to 3. * is a bonding site to another unit or a terminal group.

[0015] In formula (PA-1), R 1 is an alkyl group having 1 to 5 carbon atoms, preferably a linear or branched alkyl group having 1 to 5 carbon atoms, more preferably a methyl group, an ethyl group or a propyl group, and even more preferably a methyl group. In formula (PA-1), n1 is an integer of 0 to 3, preferably an integer of 1 or more, and more preferably an integer of 2 or less, with 1 being more preferred.

[0016] Specific examples of the alicyclic diamine include 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane, 1,3-diaminocyclohexane, 1,4-diaminocyclohexane, bis(4-aminocyclohexyl)methane, bis(4-amino-3-methylcyclohexyl)methane, 2,2-bis(4-aminocyclohexyl)propane, 2,2-bis(4-amino-3-methylcyclohexyl)propane, bis(aminomethyl)decalin, and bis(aminomethyl)tricyclodecane.

[0017] The polyamide resin (A) contains alicyclic diamine units in a proportion of preferably 75 mol % or more, more preferably 80 mol % or more, even more preferably 85 mol % or more, still more preferably 90 mol % or more, still more preferably 95 mol % or more, particularly preferably 99 mol % or more, and 100 mol % or less of the diamine units constituting the polyamide resin (A). The alicyclic diamine units may be one type or a combination of two or more types.

[0018] Examples of diamines other than alicyclic diamines that can be used as the raw diamine component of the polyamide resin (A) include aliphatic diamines such as tetramethylenediamine, pentamethylenediamine, 2-methylpentanediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, dodecamethylenediamine, 2,2,4-trimethyl-hexamethylenediamine, and 2,4,4-trimethylhexamethylenediamine, and diamines having an aromatic ring such as xylylenediamine, bis(4-aminophenyl)ether, paraphenylenediamine, and bis(aminomethyl)naphthalene, and these can be used alone or in combination of two or more.

[0019] On the other hand, in this embodiment, the aliphatic dicarboxylic acid having 7 to 20 carbon atoms constituting the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms is preferably a linear or branched aliphatic dicarboxylic acid having 7 to 20 carbon atoms, more preferably a linear aliphatic dicarboxylic acid having 7 to 20 carbon atoms, and even more preferably an α,ω-linear aliphatic dicarboxylic acid having 7 to 20 carbon atoms. The number of carbon atoms constituting the linear aliphatic dicarboxylic acid having 7 to 20 carbon atoms is preferably 8 or more, more preferably 9 or more, and even more preferably 10 or more, and is preferably 18 or less, more preferably 16 or less, even more preferably 14 or less, even more preferably 13 or less, and even more preferably 12 or less. The aliphatic dicarboxylic acid having 7 to 20 carbon atoms is preferably HOOC-(CH2) n It is preferably represented by —COOH, where n is an integer of 5 to 18. The aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms that can be used in this embodiment preferably contains at least one of a sebacic acid unit, an undecanedioic acid unit, and a dodecanedioic acid unit, and more preferably contains a sebacic acid unit and / or a dodecanedioic acid unit.

[0020] The polyamide resin (A) contains aliphatic dicarboxylic acid units having 7 to 20 carbon atoms in a proportion of preferably 75 mol % or more, more preferably 80 mol % or more, even more preferably 85 mol % or more, still more preferably 90 mol % or more, still more preferably 95 mol % or more, particularly preferably 99 mol % or more, and 100 mol % or less, of the dicarboxylic acid units constituting the polyamide resin. The aliphatic dicarboxylic acid units having 7 to 20 carbon atoms may be one type, or two or more types may be combined.

[0021] Examples of dicarboxylic acid components other than the aliphatic dicarboxylic acids having 7 to 20 carbon atoms include phthalic acid compounds such as isophthalic acid, terephthalic acid, and orthophthalic acid, and isomers of naphthalenedicarboxylic acid such as 1,2-naphthalenedicarboxylic acid, 1,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 1,6-naphthalenedicarboxylic acid, 1,7-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid, and these can be used alone or in combination of two or more.

[0022] The polyamide resin (A) used in this embodiment may further contain an aminocarboxylic acid unit, which tends to improve the color of the molded article. The type of aminocarboxylic acid constituting the aminocarboxylic acid unit is not particularly limited, and known aminocarboxylic acids can be used. The aminocarboxylic acid is preferably composed only of aliphatic hydrocarbon groups other than the terminal amino and carboxylic acid groups. The molecular weight of the aminocarboxylic acid constituting the aminocarboxylic acid unit is preferably 180 or more, more preferably 190 or more, and is preferably 400 or less, more preferably 300 or less, and even more preferably 250 or less.

[0023] The aminocarboxylic acid constituting the aminocarboxylic acid unit is preferably represented by formula (PA-2). [ka] (In formula (PA-2), n is an integer of 5 to 20.) In formula (PA-2), n is an integer of 5 to 20, preferably 6 or more, more preferably 7 or more, even more preferably 8 or more, still more preferably 9 or more, and even more preferably 10 or more, and preferably 18 or less, more preferably 16 or less, even more preferably 14 or less, still more preferably 13 or less, and even more preferably 12 or less.

[0024] The polyamide resin (A) contains diamine units and dicarboxylic acid units as main components, but does not completely exclude other monomer units, and may, of course, contain lactam units such as ε-caprolactam and laurolactam, and aliphatic aminocarboxylic acid units such as aminocaproic acid and aminoundecanoic acid. In particular, the polyamide resin (A) used in this embodiment preferably contains aminocarboxylic acid units. In this embodiment, among the monomer units constituting the polyamide resin (A), the total number of diamine units, dicarboxylic acid units, and optionally contained aminocarboxylic acid units preferably accounts for 90% by mass or more of all monomer units, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more. The molar ratio of diamine units to dicarboxylic acid units in the polyamide resin (A) is preferably 40:60 to 60:40, and more preferably 45:55 to 55:45. In addition, in this embodiment, the proportion of aminocarboxylic acid units among all monomer units constituting the polyamide resin (A) is preferably 1 mol% or more, more preferably 5 mol% or more, and is preferably 50 mol% or less, more preferably 40 mol% or less.

[0025] The polyamide resin (A) is preferably an amorphous resin. An amorphous resin is a resin that does not have a clear melting point. Specifically, it refers to a resin having a crystalline fusion enthalpy ΔHm of less than 5 J / g, preferably 3 J / g or less, and more preferably 1 J / g or less. The crystalline fusion enthalpy ΔHm is measured in accordance with JIS K7121 and K7122 during the heating process. Specifically, the polyamide resin is measured using a differential scanning calorimeter (DSC) in a nitrogen stream by heating from room temperature to 250°C at a heating rate of 10°C / min, immediately cooling to below room temperature, and then heating again from room temperature to 250°C at a heating rate of 10°C / min.

[0026] It is also preferable to use polyamide resin (A) produced using biomass raw materials (biomass polyamide resin). Using biomass polyamide resin can reduce the environmental impact. Polyamide resin (A) can also be made from monomer raw materials that have been mass balance certified (ISCC PLUS). Mass balance certification means that the amount of renewable raw materials and bio-based raw materials used at each factory or production facility and the amount of products produced and shipped are quantified, and the quality is guaranteed. Furthermore, the polyamide resin (A) may be a recycled product (including recovered products, material recycled products, chemical recycled products, etc.), a rejected product, or scrap material generated during molding of the polyamide resin (A) or the resin composition of the present embodiment.

[0027] The content of polyamide resin (A) in the resin composition of this embodiment is preferably 90% by mass or more, more preferably 94.5% by mass or more, and even more preferably 96% by mass or more, based on 100% by mass of the resin composition. By making the content equal to or greater than the lower limit, the glass transition temperature tends to be higher. Furthermore, the content of polyamide resin (A) in the resin composition of this embodiment is preferably 99.999% by mass or less, based on 100% by mass of the resin composition. By making the content equal to or less than the upper limit, the transparency of the resulting film tends to be further improved. The resin composition of the present embodiment may contain only one type of polyamide resin (A), or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0028] The resin composition of the present embodiment may or may not contain a polyamide resin other than the polyamide resin (A). Examples of polyamide resins other than the polyamide resin (A) include aliphatic polyamide resins other than the polyamide resin (A) and aromatic polyamide resins. Examples of aliphatic polyamide resins include polyamide 4, polyamide 46, polyamide 6, polyamide 66, polyamide 666, polyamide 610, polyamide 11, polyamide 116, polyamide 12, and polyamide 612. Examples of aromatic polyamide resins include polyhexamethylene terephthalamide (polyamide 6T), polyhexamethylene isophthalamide (polyamide 6I), polyamide 66 / 6T, polyamide 9T, polyamide 9MT, polyamide 10T, polyamide 6I / 6T, and xylylenediamine-based polyamide resins (such as MXD6).

[0029] It is also preferable to use, as the aliphatic polyamide resin and aromatic polyamide resin other than the polyamide resin (A), recycled resins or polyamide resins produced using biomass raw materials (biomass thermoplastic resins). Furthermore, the resin composition of this embodiment preferably does not substantially contain any polyamide resin other than the polyamide resin (A). Specifically, the content of polyamide resins other than the polyamide resin (A) contained in the resin composition of this embodiment is preferably less than 10% by mass, more preferably less than 5% by mass, even more preferably less than 3% by mass, even more preferably less than 1% by mass, and even more preferably less than 0.1% by mass, based on 100% by mass of the resin composition.

[0030] <Polyetheramide elastomer> The resin composition of this embodiment contains a polyetheramide elastomer. By using the polyetheramide elastomer in combination with a release agent, it is possible to effectively prevent contamination of the first roll during film production and prevent the film surface from becoming shark-skin-like. Furthermore, it is possible to reduce haze. A polyetheramide elastomer is an elastomer containing a polyether structure and a polyamide structure. The polyetheramide elastomer in this embodiment is substantially free of an ester structure. "Substantially free of an ester structure" means that the elastomer is not a polyesteretheramide elastomer. More specifically, the content of the ester structure is usually less than 1% by mass of the polyetheramide elastomer, preferably less than 0.5% by mass, more preferably less than 0.1% by mass, and even more preferably less than 0.01% by mass. The polyetheramide elastomer used in this embodiment preferably contains a polyalkylene glycol block and a polyamide block.

[0031] The polyalkylene glycol block is -(alkylene group -O) n2 It is preferable that the -(alkylene group -O) is represented by -. n2 The alkylene group in - is preferably a linear or branched alkylene group having 1 to 10 carbon atoms. The number of carbon atoms constituting the alkylene group is preferably 2 or more, more preferably 3 or more, and is preferably 8 or less, more preferably 6 or less, even more preferably 5 or less, and still more preferably 5 or less. Specific examples of the -(alkylene group -O)- include -(CHO)-, -(CHCHO)-, -(CHCHCHO)-, -(CH(CH)CHO)-, -(CHCHCHCHCHO)-, and -(C(CH)CHO)-, and may be a combination of two or more of these. The -(alkylene group -O) n2 n2 in - is preferably 1 to 200, and more preferably 3 to 100. The polyalkylene glycol block preferably comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block.

[0032] The proportion of polyalkylene glycol in the polyetheramide elastomer used in this embodiment is preferably 5 mol% or more, more preferably 10 mol% or more, even more preferably 15 mol% or more, and even more preferably 20 mol% or more, based on 100 mol% of all structural units of the polyetheramide elastomer. Depending on the application, it may be 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 65 mol% or more. By setting the proportion at or above the lower limit, the effect of improving impact strength when added to a polyamide resin tends to be more improved. Furthermore, the proportion of polyalkylene glycol in the polyetheramide elastomer used in this embodiment is preferably 90 mol% or less, more preferably 85 mol% or less, even more preferably 80 mol% or less, and even more preferably 75 mol% or less, based on 100 mol% of all structural units of the polyetheramide elastomer. By setting the proportion at or below the upper limit, compatibility with amorphous polyamide resins tends to be improved. The polyetheramide elastomer may contain only one type of polyalkylene glycol, or may contain two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0033] The polyamide block is preferably represented by an aliphatic polyamide block, -(NH(CH2) n3 C(=O)) n4Preferably, the aliphatic polyamide block is represented by the formula: wherein n3 is preferably 3 or more, more preferably 5 or more, even more preferably 7 or more, still more preferably 9 or more, and even more preferably 10 or more, and is preferably 20 or less, more preferably 18 or less, even more preferably 16 or less, still more preferably 14 or less, and even more preferably 12 or less. Furthermore, when n5 is the number of carbon atoms in the aliphatic dicarboxylic acid having 7 to 20 carbon atoms that constitutes the polyamide resin (A) (for example, n5=10 for sebacic acid), the difference (absolute value) between n5 and n3 is preferably small. More specifically, |n5-n3| is preferably 3 or less, and more preferably 2 or less. n4 is preferably 1-300, and more preferably 5-100.

[0034] The proportion of polyamide in the polyetheramide elastomer used in this embodiment is preferably 10 mol% or more, more preferably 15 mol% or more, even more preferably 20 mol% or more, and even more preferably 25 mol% or more, based on 100 mol% of all structural units of the polyetheramide elastomer. By ensuring that the proportion is above the lower limit, the effect of improving compatibility with amorphous polyamides tends to be more pronounced. Furthermore, the proportion of polyamide in the polyetheramide elastomer used in this embodiment is preferably 95 mol% or less, more preferably 90 mol% or less, even more preferably 85 mol% or less, and even more preferably 80 mol% or less, based on 100 mol% of all structural units of the polyetheramide elastomer. Depending on the application, the proportion may be 70 mol% or less, 60 mol% or less, 50 mol% or less, 40 mol% or less, or 35 mol% or less. By ensuring that the proportion is below the upper limit, the effect of suppressing a decrease in glass transition temperature when added to a polyamide resin tends to be more pronounced. The polyetheramide elastomer may contain only one type of polyamide, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0035] The weight-average molecular weight of the polyetheramide elastomer used in this embodiment is preferably 3,000 or more, more preferably 5,000 or more, and is preferably 100,000 or less, more preferably 80,000 or less. By making the weight-average molecular weight equal to or greater than the lower limit, toughness tends to be improved when mixed with a polyamide resin. By making the weight-average molecular weight equal to or less than the upper limit, compatibility with a polyamide resin tends to be further improved. The weight average molecular weight is an acrylic equivalent value measured by GPC (gel permeation chromatography).

[0036] In the polyetheramide elastomer used in the present embodiment, the total of the polyalkylene glycol blocks and the polyamide blocks is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 97% by mass or more, based on 100% by mass of the polyetheramide elastomer, and is preferably 100% by mass or less.

[0037] The content of the polyetheramide elastomer in the resin composition of this embodiment is, relative to 100% by mass of the resin composition, preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more. From the viewpoint of more effectively suppressing contamination of the first roll and shark skin on the film surface, it is even more preferably 2.0% by mass or more, and even more preferably 3.0% by mass or more. Furthermore, the content of the polyetheramide elastomer in the resin composition of this embodiment is, relative to 100% by mass of the resin composition, preferably 20.0% by mass or less, more preferably 15.0% by mass or less, even more preferably 10.0% by mass or less, even more preferably 8.0% by mass or less, even more preferably 7.0% by mass or less, and even more preferably 5.0% by mass or less. From the viewpoint of further improving transparency, it is even more preferably 4.5% by mass or less. The resin composition of the present embodiment may contain only one type of polyetheramide elastomer, or may contain two or more types. When two or more types are contained, the total amount is preferably in the above range.

[0038] <Release agent> The resin composition of this embodiment contains a release agent. By using the release agent in combination with the polyetheramide elastomer, it is possible to effectively prevent contamination of the first roll during film production and prevent the film surface from becoming shark-skin-like. Furthermore, it is possible to reduce haze.

[0039] The release agent used in this embodiment is not particularly limited as long as it improves releasability from metals, and for example, a compound that has low reactivity with metals can be used. Specifically, it is preferable that the composition contains at least one selected from the group consisting of fatty acid esters, fatty acid amides, and polyalkylene glycols. The use of such a compound improves the releasability of the film raw material from the roll surface or the die inner surface, effectively suppresses the contamination of the first roll during film production and the formation of shark skin on the film surface, and also tends to effectively suppress the formation of scum on the die lip.

[0040] Fatty acid esters are usually composed of fatty acids and alcohols. Fatty acid amides are, for example, composed of fatty acids and ammonia and / or amines, or are obtained by ammonolysis of fatty acid esters. Polyalkylene glycols are, for example, produced by ring-opening polymerization of alkylene oxides such as propylene oxide. In this embodiment, when at least one selected from the group consisting of fatty acid esters, fatty acid amides, and polyalkylene glycols is used, it goes without saying that the present invention is not limited to these.

[0041] In this embodiment, the number of carbon atoms in the fatty acids constituting these fatty acid esters or fatty acid amides is preferably 7 or more, more preferably 8 or more, even more preferably 9 or more, even more preferably 10 or more, and even more preferably 11 or more, and is preferably 30 or less, more preferably 28 or less, even more preferably 26 or less, even more preferably 24 or less, even more preferably 22 or less, and even more preferably 20 or less. By setting the carbon number at or above the lower limit, the release agent tends to bleed out more easily onto the resin surface during molding, which tends to further improve the effect of suppressing contamination of the first roll and the formation of a shark skin-like film surface. On the other hand, by setting the carbon number at or below the upper limit, compatibility with the resin is improved, which tends to effectively prevent the release agent itself from contaminating the first roll. The fatty acid may be a straight-chain fatty acid, a branched fatty acid, or a fatty acid having an alicyclic structure, but is preferably a straight-chain fatty acid and / or a branched fatty acid. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid. The fatty acid may also be a hydroxycarboxylic acid. The number of carboxy groups (—COOH) contained in one fatty acid molecule is preferably 1 to 10, and more preferably 1 to 4.

[0042] Here, the fatty acid ester will be described in detail. The number of ester bonds (-C(=O)O-) in one molecule of the fatty acid ester is preferably 1 to 10, and more preferably 1 to 4. The fatty acid ester used in this embodiment is preferably a full ester (a fatty acid ester that does not contain unesterified COOH). The alcohol constituting the fatty acid ester is preferably an aliphatic alcohol. The aliphatic alcohol may be a linear aliphatic alcohol, a branched aliphatic alcohol, or an aliphatic alcohol having an alicyclic structure, but is preferably a linear aliphatic alcohol and / or a branched aliphatic alcohol. The aliphatic alcohol may be a saturated aliphatic alcohol or an unsaturated aliphatic alcohol, but is preferably a saturated aliphatic alcohol. The aliphatic alcohol is preferably a monohydric to decahydric alcohol, and more preferably a monohydric to tetrahydric alcohol. The number of carbon atoms in the aliphatic alcohol is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more, and is preferably 30 or less, more preferably 25 or less, even more preferably 20 or less, still more preferably 15 or less, and even more preferably 10 or less.

[0043] In this embodiment, the aliphatic ester is preferably at least one of monoesters, diesters, triesters, and tetraesters composed of a fatty acid having 7 to 30 carbon atoms and a monohydric to tetrahydric alcohol. The fatty acid ester is preferably a full ester. The molecular weight of the fatty acid ester is preferably 100 or more and 2,000 or less.

[0044] When a fatty acid ester is used in this embodiment, specific examples include those exemplified in the examples described below, as well as methyl laurate, methyl stearate, methyl oleate, butyl stearate, isopropyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, 2-ethylhexyl oleate, cetyl myristate, myristyl myristate, stearyl stearate, behenyl behenate, and montanic acid wax.

[0045] Next, the fatty acid amide will be described in detail. The number of amide bonds (-C(=O)NH-) in one molecule of the fatty acid amide is preferably 1-10, and more preferably 1-4. The fatty acid amide is preferably composed of a fatty acid and an amine. The amine constituting the fatty acid amide is preferably an aliphatic amine. The aliphatic amine may be a linear aliphatic amine, a branched aliphatic amine, or an aliphatic amine having an alicyclic structure, but is preferably a linear aliphatic amine and / or a branched aliphatic amine. The aliphatic amine may be a saturated aliphatic amine or an unsaturated aliphatic amine, but is preferably a saturated aliphatic amine. Furthermore, the aliphatic amine preferably has 1 to 10 amino groups, and more preferably has 1 to 4 amino groups, in one molecule.

[0046] In this embodiment, the aliphatic amide is preferably at least one of monoamides, diamides, triamides, and tetraamides, each of which is composed of a fatty acid having 7 to 30 carbon atoms and an amine having 1 to 4 amino groups per molecule. The aliphatic amide is preferably a fatty acid amide that does not have an amino group (—NH2). The molecular weight of the fatty acid amide is preferably 100 or more and 1,000 or less.

[0047] When a fatty acid amide is used in this embodiment, specific examples include those exemplified in the examples described later, as well as stearic acid amide, oleic acid amide, erucic acid amide, behenic acid amide, palmitic acid amide, ethylene bisoleic acid amide, and ethylene biserucic acid amide.

[0048] Next, the polyalkylene glycol will be described in detail. The polyalkylene glycol preferably contains ethylene glycol units and / or propylene glycol units in a total amount of 50 mol % or more of all units, and has a number average molecular weight of 100 to 3,500.

[0049] In this embodiment, the polyalkylene glycol preferably contains ethylene glycol units and / or propylene glycol units in total at least 50 mol%, more preferably at least 60 mol%, even more preferably at least 70 mol%, even more preferably at least 80 mol%, even more preferably at least 90 mol%, even more preferably at least 95 mol%, and particularly preferably at least 99 mol%, and all units other than the terminal groups may be ethylene glycol units and / or propylene glycol units. By ensuring that the content is at least the above lower limit, the polyalkylene glycol is more likely to bleed out onto the resin surface during molding, and the improved slipperiness with the inner wall of the molding machine prevents retention, which tends to further improve the effects of preventing contamination of the first roll and shark skin on the film surface. On the other hand, by making the total amount of ethylene glycol units and / or propylene glycol units 50 mol % or more of all units, the polyalkylene glycol becomes more appropriately compatible with the polyamide resin, effectively preventing excessive bleeding out of the polyalkylene glycol onto the resin surface during molding, and tends to effectively prevent contamination of the first roll caused by the polyalkylene glycol itself.

[0050] In this embodiment, the polyalkylene glycol may contain other monomer units in addition to ethylene glycol units and propylene glycol units. The other monomer units are preferably alkylene glycol units other than ethylene glycol units and propylene glycol units. Examples of other alkylene glycol units include methylene glycol, butylene glycol, pentylene glycol, hexylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, neopentyl glycol, 3-methyltetramethylene glycol, and hexamethylene glycol.

[0051] In this embodiment, the polyalkylene glycol may be modified at its terminal with any substituent. The modification of the terminals may be carried out at only one terminal of the polyalkylene glycol or at both terminals. The optional substituents include a carboxyl group, a hydroxy group, an alkyl ether, an aryl ether, an aralkyl ether, a fatty acid ester, and an aryl ester.

[0052] In this embodiment, the number-average molecular weight of the polyalkylene glycol is preferably 100 to 3500, with the lower limit being more preferably 300 or more, even more preferably 500 or more, still more preferably 800 or more, and even more preferably 1000 or more, and the upper limit being more preferably 3000 or less, even more preferably 2000 or less, and still more preferably 1500 or less. By setting the number-average molecular weight at or above the lower limit, volatilization of the polyalkylene glycol tends to be effectively suppressed. On the other hand, by setting the number-average molecular weight at or below the upper limit, deterioration in transparency tends to be more effectively suppressed. This is presumably because polyalkylene glycol is not completely compatible with polyamide resin, forming a sea-island structure. When the number-average molecular weight of the polyalkylene glycol is high, the island portions expand, the refractive index difference increases, and transparency decreases. The number average molecular weight is measured in accordance with JIS K1577.

[0053] When polyalkylene glycol is used in this embodiment, specific examples include polyethylene glycol, polypropylene glycol, or a copolymer containing ethylene glycol units and / or propylene glycol units and other alkylene glycol units, with polyethylene glycol or propylene glycol being preferred, and polypropylene glycol being more preferred from the viewpoint of ease of production.

[0054] In the present embodiment, the polyalkylene glycol is not particularly limited, and may be produced by a known method, or a commercially available product may be used, such as D-1000 (manufactured by NOF Corporation), D-2000 (manufactured by NOF Corporation), or D-4000 (manufactured by NOF Corporation).

[0055] The content of the release agent in the resin composition of this embodiment is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.01% by mass or more, even more preferably 0.1% by mass or more, and even more preferably 0.3% by mass or more, based on 100% by mass of the resin composition. It is also preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, even more preferably 2% by mass or less, and even more preferably 1% by mass or less. By ensuring that the content is equal to or greater than the lower limit, contamination of the first roll during molding and shark-skin appearance of the film surface tend to be effectively suppressed. Furthermore, by ensuring that the content is equal to or less than the upper limit, deterioration in transparency, glass transition temperature, and toughness tend to be more effectively suppressed. The resin composition of this embodiment may contain only one type of release agent, or may contain two or more types. When two or more types are contained, the total amount preferably falls within the above range.

[0056] The resin composition of this embodiment preferably has a polyamide resin (A) content of 80.0 to 99.9% by mass, a polyetheramide elastomer content of 20.0 to 0.1% by mass, and a release agent content of 0.001 to 10% by mass. By keeping the polyetheramide elastomer and release agent contents at or below the upper limit values, transparency tends to be synergistically improved. The total amount of the polyamide resin (A), the polyetheramide elastomer, and the release agent does not exceed 100% by mass.

[0057] In the resin composition of the present embodiment, the total of the polyamide resin (A), polyetheramide elastomer, and release agent preferably accounts for 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more, based on 100% by mass of the resin composition, and is preferably 100% by mass or less.

[0058] <Other ingredients> The resin composition of the present embodiment may or may not contain components other than the polyamide resin (A), the polyetheramide elastomer, and the mold release agent. Examples of other components include ultraviolet absorbers, antioxidants, heat stabilizers, flame retardants, flame retardant assistants, colorants, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, sliding improvers, hue improvers, and acid trapping agents. In addition, the resin composition of this embodiment may contain additives described in paragraphs 0047 to 0103 of International Publication No. 2021 / 241471 and additives described in paragraphs 0041 to 0056 of Japanese Patent Application Laid-Open No. 2023-61203, within the scope of the present invention, and the contents of these additives are incorporated herein by reference.

[0059] When other components are contained, the total content thereof is preferably 0.001 to 3 mass% of the resin composition, more preferably less than 2 mass%, even more preferably less than 1 mass%, even more preferably less than 0.5 mass%, even more preferably less than 0.1 mass%, and may be less than 0.01 mass%. The other component may be contained in only one kind or in two or more kinds. When two or more kinds of other components are contained, it is preferable that the total amount is in the above range.

[0060] <Physical properties of resin composition> The resin composition of the present embodiment preferably has excellent transparency. Specifically, the resin composition of this embodiment preferably has a total light transmittance of 80% or more, more preferably 85% or more, and even more preferably 90% or more when molded to a thickness of 300 μm. The upper limit of the total light transmittance is preferably 100%, but the required performance is also satisfied even if it is 99% or less. Furthermore, the resin composition of this embodiment, when molded to a thickness of 300 μm, preferably has a haze of 3.0% or less, more preferably 2.0% or less, even more preferably 1.5% or less, even more preferably 1.0% or less, still more preferably 0.9% or less, even more preferably 0.8% or less, and particularly preferably 0.7% or less. The lower limit of the haze is preferably 0%, but the required performance is also satisfied even if it is 0.001% or more. The total light transmittance and haze are measured according to the description in the examples below.

[0061] <Method of manufacturing resin composition> As a method for producing the resin composition of the present embodiment, any method can be adopted. For example, it can be obtained by adding polyamide resin (A), polyetheramide elastomer, and a release agent, and melt-kneading them. More specifically, the polyamide resin (A), polyetheramide elastomer, and release agent, as well as other components that are added as needed, are mixed using a mixing means such as a V-type blender to prepare a lump-blended product, which is then melt-kneaded in a vented extruder and pelletized.

[0062] <Film> The film of this embodiment is formed from the film of this embodiment. The thickness of the film of this embodiment is preferably 10 μm or more, more preferably 50 μm or more, and even more preferably 100 μm or more, and is preferably 1000 μm or less, more preferably 800 μm or less, even more preferably 700 μm or less, even more preferably 600 μm or less, and even more preferably 500 μm or less.

[0063] The film of the present embodiment preferably has excellent transparency. Specifically, the film of this embodiment preferably has a total light transmittance of 80% or more, more preferably 85% or more, and even more preferably 90% or more. The upper limit of the total light transmittance of the film is preferably 100%, but the required performance is also satisfied even if it is 99% or less. Furthermore, the haze of the film of this embodiment is preferably 3.0% or less, more preferably 2.0% or less, even more preferably 1.5% or less, even more preferably 1.0% or less, still more preferably 0.9% or less, even more preferably 0.8% or less, and particularly preferably 0.7% or less. The lower limit of the haze of the film is preferably 0%, but the required performance is also satisfied even if it is 0.001% or more. The total light transmittance and haze are measured according to the description in the examples below.

[0064] <Wound body> The film of this embodiment can be wound around a core material to form a roll.

[0065] <Polarizing sheet> A film formed from the resin composition of this embodiment or the film of this embodiment is preferably used as a protective film for a polarizing sheet (a film that protects a polarizing film). In this embodiment, the polarizing sheet preferably includes the film of this embodiment and a polarizing film, and is a sheet laminated in this order: the polarizing film and the protective film. That is, the film of this embodiment is preferably used as at least one of the protective films of the polarizing sheet. The protective film is usually attached to the polarizing film via an adhesive. In this embodiment, the protective film on one side of the polarizing sheet may be the film of this embodiment or another protective film. The protective film on the other side of the polarizing sheet may be a known protective film for a polarizing sheet, and may be the same as the film of this embodiment. Known polarizing films can be used, and examples thereof include polyvinyl alcohol (PVA) films with iodine or a dichroic organic dye adsorbed or impregnated therein. The adhesive used to bond the film / protective film and the polarizing film of the present embodiment can be a known adhesive, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, polyvinyl alcohol adhesives, etc. Among these, urethane adhesives are preferred. The thickness of the adhesive is usually 1 μm or more and usually 30 μm or less. Furthermore, the polarizing sheet of this embodiment may further include a masking film or the like on the outer side of the protective film.

[0066] In this embodiment, the polarizing sheet of this embodiment is preferably used for a heat-bent molded article that has been subjected to heat bending processing. When the film of this embodiment is used in a polarizing sheet, it may be provided on either side of a polarizing film, or on both sides. In the first mode, the film of this embodiment is disposed so as to be positioned on the convex side of the polarizing film after heat bending, for example, on the side of the protective film 4 in FIG. In the second mode, the film of this embodiment is disposed so as to be positioned on the concave side of the polarizing film after heat bending, for example, on the side of the protective film 3 in FIG. In the third embodiment, the film of this embodiment is positioned on both sides of the polarizing film, for example, both of the protective films 3 and 4 in FIG. 2 are the film of this embodiment. In FIG. 2, the lens 1, polarizing film 2, and protective films 3 and 4 are bent, but it goes without saying that this embodiment also includes polarizing sheets that are not bent. The protective film used in the polarizing sheet of this embodiment may be stretched or not. In the first embodiment, it is preferably stretched. In the second embodiment, it is preferably not stretched.

[0067] In this embodiment, the polarizing sheet is preferably used as a polarizing sheet for use in liquid crystal display devices, polarized lenses (sunglasses, ski goggles, prescription eyeglass lenses, camera viewfinder lenses), covers for various instruments, glass for automobiles, glass for trains, polarizing sheets for in-vehicle display panels and electronic device housings, etc., in-vehicle inner mirrors, silver mirrors for helmets, etc., and is particularly preferably used as sunglasses. [Example]

[0068] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0069] 1.Raw materials A1: XE4205, manufactured by EMS, a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane and sebacic acid, amorphous polyamide resin A2: XE4805, manufactured by EMS, a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane and sebacic acid, amorphous polyamide resin A3: G850, manufactured by Arkema, a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane, sebacic acid, and aminoundecanoic acid (the ratio of aminoundecanoic acid is 17 mol% relative to 100 mol% of the raw material monomers), amorphous polyamide resin

[0070] B1: 9055X1, a polyetheramide elastomer composed of 42 mol% polyamide 12, 37 mol% PTMG, and 21 mol% PPO, manufactured by UBE B2: 9048X1, a polyetheramide elastomer composed of 30 mol% polyamide 12, 43 mol% PTMG, and 27 mol% PPO, manufactured by UBE

[0071] C1: EB-P, Kao Corporation, fatty acid amide [ka] C2: H-476, NOF Corporation, fatty acid ester [ka] C3: D-1000, NOF Corporation, polypropylene glycol, number average molecular weight: 1000 [ka]

[0072] 2. Examples 1 to 5 and Comparative Examples 1 to 3 <Manufacturing resin pellets> Each component was blended in a tumbler to obtain the composition shown in Table 1 below (contents in parts by mass in Table 1), and the blend was then fed into the base of a twin-screw extruder (TEX30α, manufactured by The Japan Steel Works, Ltd.) and melt-kneaded at a cylinder temperature of 280°C to produce pellets for the Examples and Comparative Examples.

[0073] <Film manufacturing> The pellets obtained above were extruded into a molten state using a T-die melt extruder consisting of a vented single-screw extruder (Shibaura Machine Co., Ltd.) with a screw nominal diameter of 50 mm and a screw L / D of 31.6 at a screw rotation speed of 115 rpm. The extruded pellets were pressed between a first roll and a second roll, and then cooled and solidified to produce a film. The cylinder temperature was 280°C, the die temperature was 300°C, and the roll temperature was 120°C. A film with a thickness of 300 μm was obtained.

[0074] Details of the first roll and second roll used are as follows. First roll: Shibaura Machine Co., Ltd., UM roll Dimensions: outer diameter 300mm x roll width 600mm

[0075] Second roll: Shibaura Machine Co., Ltd., rigid metal roll (surface: chrome-treated) Dimensions: outer diameter 300mm x roll width 600mm

[0076] <Roll stains> After 350 kg of polyamide resin raw material was consumed to produce film, the first and second rolls were visually evaluated as follows. The evaluation was carried out by five experts and judged by majority vote. In the table below, the evaluation results for the first roll are shown in the "No. 1R Roll Contamination" column, and the evaluation results for the second roll are shown in the "No. 2R Roll Contamination" column. A: No contamination of the roll was observed, or some contamination of the roll was observed but at a level that was acceptable for practical use. B: Roll contamination occurred, and it was beyond the practical level.

[0077] <Poor shark skin appearance> The film was visually inspected 7 hours after passing the paper and evaluated as follows: The evaluation was carried out by five experts and judged by majority vote. A: No shark skin-like film surface was observed, or some shark skin-like film surface was observed, but at a practical level. B: Shark skin-like film surface occurred, and it was not practical.

[0078] <Poor eye appearance> The film was visually inspected 7 hours after passing the paper and evaluated as follows: The evaluation was carried out by five experts and judged by majority vote. A: No scum was observed on the film surface, or some scum was observed on the film surface but at a level that was acceptable for practical use. B: Smearing occurred on the film surface, making it unsuitable for practical use.

[0079] <Haze and total light transmittance measurements> Using a haze meter, the haze (%) and total light transmittance (%) of the 300 μm thick film obtained above were measured under conditions of a D65 light source and a 10° field of view. The haze meter used was "HM-150" manufactured by Murakami Color Research Laboratory.

[0080] [Table 1]

[0081] As is clear from the results in Table 1, in the present invention, a film was obtained that effectively prevented the first roll from becoming dirty and the film surface from becoming shark skin-like. In contrast, when only polyamide resin (A) was used (Comparative Example 1), when only polyamide resin (A) and polyetheramide elastomer (B) were used (Comparative Example 2), and when only polyamide resin (A) and release agent (C) were used (Comparative Example 3), contamination of the first roll and shark-skin surface of the film occurred during film production. [Explanation of symbols]

[0082] 1 lens 2. Polarizing film 3 Protective film 4 Protective Film 10 Raw materials 11 Dice 12 First Roll 13 Second Roll 14 Third Roll 15 Dirt

Claims

1. A resin composition for use in a protective film of a polarizing sheet, the resin composition comprising a polyamide resin containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, a polyetheramide elastomer, and a release agent, A resin composition, wherein the content of the polyamide resin in the resin composition is 80.0% by mass or more, the content of the polyetheramide elastomer is 15.0 to 0.1% by mass, and the content of the release agent is 0.001 to 10% by mass (however, the total content of the polyamide resin, polyetheramide elastomer, and release agent does not exceed 100% by mass).

2. 2. The resin composition according to claim 1, wherein the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms includes a sebacic acid unit and / or a dodecanedioic acid unit.

3. The resin composition according to claim 1 or 2, wherein the alicyclic diamine constituting the alicyclic diamine unit contains two substituted or unsubstituted cyclohexane rings.

4. The resin composition according to claim 1 or 2, wherein the alicyclic diamine unit includes a unit represented by formula (PA-1): 【Chemistry 1】 (In formula (PA-1), R １ are each independently an alkyl group having 1 to 5 carbon atoms, and each n1 is independently an integer of 0 to 3. * is a bonding site with another unit or a terminal group.

5. The resin composition according to claim 1 or 2, wherein the polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block.

6. The resin composition according to claim 5 , wherein the polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block.

7. The resin composition according to claim 1 or 2, wherein the release agent comprises at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a polyalkylene glycol.

8. The resin composition according to claim 1 or 2, wherein the polyamide resin is an amorphous resin.

9. 3. The resin composition according to claim 1, wherein the resin composition has a haze of 3.0% or less when molded into a film having a thickness of 300 μm.

10. 3. The resin composition according to claim 1, wherein the resin composition has a total light transmittance of 80% or more when molded into a film having a thickness of 300 μm.

11. the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms includes a sebacic acid unit and / or a dodecanedioic acid unit, the alicyclic diamine unit contains a unit represented by formula (PA-1), the polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block; the polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block; the release agent contains at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a polyalkylene glycol; the polyamide resin is an amorphous resin, The resin composition has a haze of 3.0% or less when molded into a film with a thickness of 300 μm, When the resin composition is molded into a film having a thickness of 300 μm, the total light transmittance is 80% or more. The resin composition according to claim 1. 【Chemistry 2】 (In formula (PA-1), R １ are each independently an alkyl group having 1 to 5 carbon atoms, and each n1 is independently an integer of 0 to 3. * is a bonding site with another unit or a terminal group.

12. A film formed from the resin composition according to claim 1 , 2 or 11 .

13. A polarizing sheet comprising the film according to claim 12 and a polarizing film.

14. Sunglasses comprising the polarizing sheet according to claim 13.

Images