Resin composition, film, polarizing sheet, and sunglasses

Abstract

Provided are a resin composition, a film, a polarizing sheet, and sunglasses. The resin composition contains: a polyamide resin containing alicyclic diamine units and C7-20 aliphatic dicarboxylic acid units; a polyether amide elastomer; and a release agent.

Description

Resin composition, film, polarizing sheet, and sunglasses

[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.

[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).

[0003] JP 2015-129271 A JP 2013-001906 A JP 2012-131977 A

[0004] As described above, polyamide resins are used in a wide variety of fields. However, they generally have poor transparency and have not been used in applications requiring transparency. Under these circumstances, the present inventors investigated the use of polyamide resins in applications requiring transparency, such as protective films for polarizing films. However, when polyamide resins are molded into films, contamination of rolls may occur during film production, and the film surface may develop a shark skin pattern. The present invention aims to solve these problems by providing a resin composition capable of providing a film that effectively prevents contamination of the first roll during film production and the development of a shark skin pattern on the film surface, as well as a film, a polarizing sheet, and sunglasses.

[0005] In light of the above-mentioned problems, the present inventors conducted research and found that the above-mentioned problems can be solved by blending a polyetheramide elastomer and a mold release agent with a specific polyamide resin. Specifically, the above-mentioned problems were solved by the following means. <1> A resin composition comprising a polyamide resin containing alicyclic diamine units and aliphatic dicarboxylic acid units having 7 to 20 carbon atoms, a polyetheramide elastomer, and a mold release agent. <2> The resin composition according to <1>, in which the aliphatic dicarboxylic acid units having 7 to 20 carbon atoms include sebacic acid units and / or dodecanedioic acid units. <3> The resin composition according to <1> or <2>, in which the alicyclic diamine constituting the alicyclic diamine units includes two substituted or unsubstituted cyclohexane rings. <4> The resin composition according to any one of <1> to <3>, in which the alicyclic diamine units include units represented by formula (PA-1). (In formula (PA-1), R １are 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 an end group.) <5> The resin composition according to any one of <1> to <4>, wherein the polyetheramide elastomer includes a polyalkylene glycol block and a polyamide block. <6> The resin composition according to <5>, wherein the polyalkylene glycol block includes a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block. <7> The resin composition according to any one of <1> to <6>, wherein 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). <8> The resin composition according to any one of <1> to <7>, 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. <9> The resin composition according to any one of <1> to <8>, wherein the polyamide resin is an amorphous resin. <10> The resin composition according to any one of <1> to <9>, wherein the haze of the resin composition when molded into a film having a thickness of 300 μm is 3.0% or less. <11> The resin composition according to any one of <1> to <10>, wherein the total light transmittance of the resin composition when molded into a film having a thickness of 300 μm is 80% or more. <12> The resin composition according to any one of <1> to <11>, wherein the resin composition is used for a protective film for a polarizing sheet.<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 contains a unit represented by formula (PA-1), the polyetheramide elastomer contains a polyalkylene glycol block and a polyamide block, the polyalkylene glycol block contains 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 mass%, the content of the polyetheramide elastomer is 20.0 to 0.1 mass%, and the content of the release agent is 0.001 to 10 mass% (however, the total of the polyamide resin, polyetheramide elastomer, and release agent does not exceed 100 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 according to any one of <1> to <12>, wherein the haze of the resin composition when molded into a film having a thickness of 300 μm is 3.0% or less, and the total light transmittance of the resin composition when molded into a film having a thickness of 300 μm is 80% or more, and the resin composition is used for a protective film of a polarizing sheet. (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 an end group.) <14> A film formed from the resin composition according to any one of <1> to <13>. <15> A polarizing sheet comprising the film according to <14> and a polarizing film. <16> Sunglasses comprising the polarizing sheet according to <15>.

[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.

[0007] 1 is a schematic diagram illustrating a process for producing a film according to the present invention. 2 is a schematic diagram illustrating an example of a layer structure of a heat-bent molded article according to the present embodiment.

[0008] Hereinafter, a detailed description of an embodiment of the present invention (hereinafter simply referred to as "the present embodiment") will be given. Note that the following present embodiment is an example for explaining the present invention, and the present invention is not limited to this embodiment. In this specification, the term "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 numerical values ​​in this specification is cited as an example of this embodiment. In this specification, various physical property values ​​and characteristic values ​​are those at 23°C unless otherwise specified. In this specification, when a group (atomic group) is described without specifying whether it is substituted or unsubstituted, it encompasses both a group (atomic group) that has no substituent and a group (atomic group) that has a substituent. For example, the term "alkyl group" encompasses not only an alkyl group that has no substituent (unsubstituted alkyl group) but also an alkyl group that has a substituent (substituted alkyl group). In this specification, when a term without specifying whether it is substituted or unsubstituted, it is preferred that it be unsubstituted. Examples of the substituent in this specification are 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 heterocyclicoxy 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 still more preferably an alkyl group. The formula weight of these substituents is preferably 15 or more, and preferably 200 or less. The formula weight is, for example, the formula weight of a methyl group (-CH ３ ) is 15. These substituents may further have a substituent, but it is preferable that they have no substituent.

[0009] In this specification, the term "film" refers to a generally flat molded body that is thin relative to its length and width, and is intended to include sheets. Furthermore, the term "film" in this specification may be either single-layer or multi-layer, with single-layer being preferred. If the measurement methods and other aspects described in the standards set forth in this specification vary from year to year, they shall be based on the standards as of January 1, 2024, unless otherwise specified. If the measurement methods and other aspects described in the standards set forth in this specification are discontinued as of January 1, 2024, they shall be based on the standards as of the time of discontinuation. The scales in Figures 1 and 2 may not be consistent with reality.

[0010] The resin composition of this embodiment is characterized by including 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. This configuration allows for the production of a film that effectively prevents contamination (e.g., 15 in FIG. 1 ) of the first roll (e.g., 12 in FIG. 1 ) and the formation of a shark-skin texture on the film surface. The resin composition of this embodiment is produced, for example, using an apparatus such as that shown in FIG. 1 . That is, FIG. 1 shows a schematic diagram of the film production process according to the present invention, with 10 representing the raw material, 11 representing the die, 12 representing the first roll, 13 representing the second roll, 14 representing the third roll, and 15 representing the contamination. Because the first roll 12 is in contact with the film raw material 10 for a shorter period of time, it is believed that contamination 15 is more likely to occur on the first roll 12 than on the second roll 13. Furthermore, because the raw material 10 is cooled and solidified before contacting the third roll 14, contamination on the third roll 14 is minimal. Improving roll contamination 15 on both the first roll 12 and the second roll 13 is extremely important for obtaining a film with a good appearance. It is believed that first roll contamination is caused, for example, by the polyamide resin remaining in the die during extrusion molding and adhering to the metal wall, resulting in decomposition of the polyamide resin. Furthermore, the shark skin on the film surface is thought to occur when the polyamide resin easily adheres to the metal inner wall of the die, causing localized unevenness in the resin flow within the die. The inventors' investigations have revealed that the use of a polyetheramide elastomer and a mold release agent makes it difficult for the polyamide resin to adhere to the metal inner wall of the die, thereby effectively suppressing first roll contamination and the shark skin on the film surface. This is presumably because the addition of a polyetheramide elastomer and a release agent effectively prevents components derived from aliphatic dicarboxylic acid units or aminocarboxylic acid units having 7 to 20 carbon atoms from adhering to the rolls during film production, and furthermore, the release agent is more likely to be present on the metal wall surface side of the die in the resin composition, thereby improving the releasability of the film from the roll surface and the inner surface of the die.It is believed that the use of the polyetheramide elastomer and the release agent in this manner has resulted in a resin composition that can provide a film that can effectively prevent contamination of the first roll during film production and prevent the film surface from becoming shark skin-like. The details of this embodiment are described below.

[0011] <Polyamide Resin Comprising Alicyclic Diamine Units and Aliphatic Dicarboxylic Acid Units Having 7 to 20 Carbon Atoms> The resin composition of this embodiment comprises a polyamide resin (sometimes referred to herein as "polyamide resin (A)") comprising alicyclic diamine units and aliphatic dicarboxylic acid units having 7 to 20 carbon atoms. The alicyclic structure of polyamide resin (A) improves the transparency of the polyamide resin itself, and the aliphatic dicarboxylic acid units having 7 to 20 carbon atoms increase 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 5-membered alicyclic ring and / or a 6-membered alicyclic ring. The 5-membered ring and / or the 6-membered ring may or may not have a substituent. Furthermore, the alicyclic diamine is preferably composed solely 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 even more 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 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). (In formula (PA-0), each R is independently a substituent, and each n is independently an integer of 0 to 5. L is a single bond or a divalent linking group. * is a bonding site with 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, even more preferably a methyl group, ethyl group, or propyl group, and even more preferably a methyl group. In formula (PA-0), each n is independently an integer of 0 to 5, and is preferably an integer of 1 or greater, and is 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, still 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 still more preferably a methylene group. * represents 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 bonded to a hydrogen atom to form a terminal amino group together with NH in formula (PA-0), or bonded to a terminal group.

[0014] In this embodiment, the alicyclic diamine unit more preferably contains a unit represented by formula (PA-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.

[0015] In formula (PA-1), R １is 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 also preferably an integer of 2 or less, and even more preferably 1.

[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 of one type or a combination of two or more types.

[0018] Examples of diamines other than alicyclic diamines that can be used as raw material diamines for 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. 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 in the aliphatic dicarboxylic acid having 7 to 20 carbon atoms (preferably a 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-(CH ２ ) 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 (A). 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 acids other than 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. The inclusion of an aminocarboxylic acid unit tends to further improve the color of molded articles such as films. The type of aminocarboxylic acid constituting the aminocarboxylic acid unit is not particularly limited, and known aminocarboxylic acids can be used. In this embodiment, the aminocarboxylic acid is preferably composed solely of aliphatic hydrocarbon groups, except for 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 preferably 400 or less, more preferably 300 or less, and even more preferably 250 or less.

[0023] In this embodiment, the aminocarboxylic acid constituting the aminocarboxylic acid unit is preferably represented by formula (PA-2). (In formula (PA-2), n is an integer of 5 to 20.) In formula (PA-2), n is an integer of 5 to 20, and is 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 is 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] Although the polyamide resin (A) primarily contains diamine units and dicarboxylic acid units, other monomer units are not completely excluded. It goes without saying that the polyamide resin (A) may 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 mass of the diamine units, dicarboxylic acid units, and optionally included aminocarboxylic acid units preferably accounts for 90% by mass or more of the total 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. Furthermore, in the present embodiment, when the polyamide resin (A) contains an aminocarboxylic acid unit, the proportion of the aminocarboxylic acid unit among all the monomer units constituting the polyamide resin (A) is preferably 1 mol% or more, more preferably 5 mol% or more, and even more preferably 10 mol% or more, and is preferably 50 mol% or less, more preferably 40 mol% or less, even more preferably 30 mol% or less, and even more preferably 20 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, the crystalline melting enthalpy ΔHm is less than 5 J / g, and the ΔHm is preferably 3 J / g or less, more preferably 1 J / g or less. The crystalline melting 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 a polyamide resin (biomass polyamide resin) produced using biomass raw materials as the polyamide resin (A). The use of biomass polyamide resins can reduce the environmental impact. The polyamide resin (A) can also be made from mass balance certified (ISCC PLUS) monomer raw materials. Mass balance certification means that the amount of renewable raw materials or bio-based raw materials used in each factory or production facility and the amount of products produced or shipped are quantified and guaranteed along with their quality. Furthermore, the polyamide resin (A) may be recycled products (including recovered products, material recycled products, chemical recycled products, etc.), rejected products, or scraps generated during the molding of the polyamide resin (A) or the resin composition of this 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 obtained film tends to be further improved. The resin composition of this embodiment may contain only one type of polyamide resin (A), or may contain two or more types. When two or more types are contained, it is preferable that the total amount be within the above range.

[0028] The resin composition of this 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 (e.g., MXD6).

[0029] It is also preferable that the aliphatic polyamide resin and aromatic polyamide resin other than the polyamide resin (A) are polyamide resins (biomass thermoplastic resins) produced using recycled resins or biomass raw materials. Furthermore, it is preferable that the resin composition of this embodiment substantially does not 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. Using a polyetheramide elastomer in combination with a release agent can effectively prevent contamination of the first roll during film production and prevent the film surface from becoming shark-skin-like. Furthermore, haze can also be reduced. The polyetheramide elastomer is an elastomer containing a polyether structure and a polyamide structure. The polyetheramide elastomer of this embodiment is substantially free of an ester structure. "Substantially free of an ester structure" means that the polyetheramide elastomer is not a polyester etheramide elastomer. More specifically, the content of the ester structure is typically 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 even more preferably 5 or less. Specific examples of the -(alkylene group -O)- include -(CH ２ O)-, -(CH ２ CH ２ O)-, -(CH ２ CH ２ CH ２ O)-,-(CH(CH ３ ) CH ２ O)-, -(CH ２ CH ２ CH ２ CH ２ O)-,-(C(CH ３) ２ CH ２ Examples of the -(alkylene group -O) include -, and a combination of two or more of these is also acceptable. ｎ２ In the formula, n2 is preferably 1 to 200, and more preferably 3 to 100. The polyalkylene glycol block preferably contains 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 polyamide resin (A) 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 polyamide resin (A) (preferably an amorphous polyamide resin) 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 in the above range.

[0033] The polyamide block is preferably represented by an aliphatic polyamide block, -(NH(CH ２ ) ｎ３ C(=O) ｎ４Preferably, the aliphatic polyamide block is represented by the formula: n3. Here, n3 is preferably 3 or more, more preferably 5 or more, even more preferably 7 or more, even 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, even 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 polyamide resin (A) (for example, sebacic acid has n5 = 10), it is preferable that the difference (absolute value) between n5 and n3 is small. More specifically, |n5 - n3| is preferably 3 or less, and more preferably 2 or less. n4 is preferably 1 to 300, and more preferably 5 to 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 setting the proportion at or above the lower limit, the effect of improving compatibility with polyamide resin (A) (preferably an amorphous polyamide resin) tends to be more improved. 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, it may be 70 mol% or less, 60 mol% or less, 50 mol% or less, 40 mol% or less, or 35 mol% or less. By setting the proportion at or below the upper limit, the effect of suppressing a decrease in glass transition temperature when added to polyamide resin (A) tends to be more improved. The polyetheramide elastomer may contain only one type of polyamide or 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 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 polyamide resin (A). By making the weight average molecular weight equal to or less than the upper limit, compatibility with polyamide resin (A) tends to be further improved. The weight average molecular weight is an acrylic equivalent value measured by GPC (gel permeation chromatography) method.

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

[0037] The content of the polyetheramide elastomer in the resin composition of this embodiment is 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, relative to 100% by mass of the resin composition. From the viewpoint of more effectively suppressing contamination of the first roll and shark-skin-like formation of 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 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, relative to 100% by mass of the resin composition. From the viewpoint of further improving transparency, it is even more preferably 4.5% by mass or less. The resin composition of this embodiment may contain only one type of polyetheramide elastomer or two or more types. When two or more types are contained, the total amount is preferably within the above range.

[0038] <Release Agent> The resin composition of the present embodiment contains a release agent. By using a release agent in combination with a 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 with low reactivity with metals can be used. Specifically, it preferably 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 between the roll surface or die inner surface and the film raw material, effectively suppresses contamination of the first roll during film production and the formation of a shark skin-like film surface, and also tends to effectively suppress the occurrence 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 of the fatty acid 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, even more preferably 11 or more, and 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 easily onto the resin surface during molding, which tends to further suppress contamination of the first roll. By setting the carbon number at or below the upper limit, compatibility with the polyamide resin (A) tends to be improved, which tends to effectively suppress contamination of the first roll by the release agent itself. 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 molecule of the fatty acid 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, even 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 2000 or less.

[0044] When a fatty acid ester is used in the present embodiment, specific examples include those exemplified in the examples described later, 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, fatty acid amides will be described in detail. The number of amide bonds (—C(═O)NH—) in one molecule of fatty acid amide is preferably 1 to 10, and more preferably 1 to 4. Furthermore, fatty acid amides are 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. Furthermore, 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 in one molecule, and more preferably has 1 to 4 amino groups.

[0046] In this embodiment, the aliphatic amide is preferably at least one of monoamides, diamides, triamides, and tetraamides, which are composed of a fatty acid having 7 to 30 carbon atoms and an amine having 1 to 4 amino groups in one molecule. ２ 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, retention of the resin composition due to improved slippage with the inner wall of the molding machine caused by bleeding out of the polyalkylene glycol onto the resin surface during molding tends to be suppressed, thereby further suppressing contamination of the first roll and shark skin-like appearance of the film surface. Furthermore, by making the ethylene glycol units and / or propylene glycol units account for 50 mol% or more in total of all units, the copolymer becomes more appropriately compatible with the polyamide resin (A), effectively preventing excessive bleeding out of the polyalkylene glycol onto the film 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 an optional substituent. The terminal modification may be at only one terminal of the polyalkylene glycol or at both terminals. The optional substituent may include a carboxyl group, a hydroxyl 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, even more preferably 800 or more, and even more preferably 1000 or more. The upper limit is more preferably 3000 or less, even more preferably 2000 or less, and even 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. Furthermore, by setting the number-average molecular weight at or below the upper limit, deterioration of transparency tends to be more effectively suppressed. This is presumably because the polyalkylene glycol is not completely compatible with the polyamide resin (A), forming a sea-island structure. If the number-average molecular weight of the polyalkylene glycol is high, the island portions expand, increasing the refractive index difference and reducing transparency. 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. Examples of commercially available products include D-1000 (manufactured by NOF Corporation), D-2000 (manufactured by NOF Corporation), and 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-like formation 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 is preferably within the above range.

[0056] In the resin composition of this embodiment, the content of polyamide resin (A) in the resin composition is preferably 80.0 to 99.9% by mass, the content of polyetheramide elastomer is 20.0 to 0.1% by mass, and the content of release agent is 0.001 to 10% by mass. By setting the contents of polyetheramide elastomer and release agent to the above upper limit values ​​or less, transparency tends to be synergistically improved. Note that the total of polyamide resin (A), polyetheramide elastomer, and release agent does not exceed 100% by mass.

[0057] In the resin composition of the present embodiment, the total of the polyamide resin (A), the polyetheramide elastomer, and the 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 still 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 Components> The resin composition of this embodiment may or may not contain components other than the polyamide resin (A), polyetheramide elastomer, and mold release agent. Examples of other components include ultraviolet absorbers, antioxidants, heat stabilizers, flame retardants, flame retardant aids, colorants, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, sliding improvers, hue improvers, acid trapping agents, and the like. In addition, the resin composition of this embodiment may contain additives described in paragraphs

[0047] to

[0103] of WO 2021 / 241471, additives described in paragraphs

[0041] to

[0056] of JP 2023-61203 A, and additives described in paragraphs

[0017] to

[0021] of WO 2024 / 029515, the contents of which 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 even be less than 0.01 mass%. Only one type of other component may be contained, or two or more types may be contained. When two or more types of other components are contained, the total amount is preferably in the above range.

[0060] <Physical Properties of Resin Composition> The resin composition of this embodiment preferably has excellent transparency. Specifically, when the resin composition of this embodiment is formed into a 300 μm thick film, the total light transmittance is preferably 80% or more, more preferably 85% or more, and even more preferably 90% or more. The upper limit of the total light transmittance is preferably 100%, but the required performance is met even if it is 99% or less. Furthermore, when the resin composition of this embodiment is formed into a 300 μm thick film, the haze 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, even 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 met 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 for Producing Resin Composition> Any method can be used to produce the resin composition of this embodiment. For example, the resin composition can be obtained by mixing and melt-kneading the polyamide resin (A), the polyetheramide elastomer, and the release agent. More specifically, the polyamide resin (A), the polyetheramide elastomer, the release agent, and other components that are added as needed are mixed using a mixing means such as a V-blender to prepare a lump blend, which is then melt-kneaded and pelletized in a vented extruder.

[0062] <Film> The film of this embodiment is formed from the resin composition 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 this 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 met even if it is 99% or less. Furthermore, the film of this embodiment 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, even 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 met 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] <Rolled Body> The film of the present embodiment can be wound around a core material to form a rolled body.

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

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

[0067] In this embodiment, the polarizing sheet is preferably used as a polarizing sheet for use in liquid crystal display devices, polarizing 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.

[0068] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate 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, an amorphous polyamide resin A2: XE4805, manufactured by EMS, a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane and sebacic acid, an 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 proportion of aminoundecanoic acid is 17 mol% relative to 100 mol% of the raw material monomers), an 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, manufactured by Kao Corporation, fatty acid amide C2: H-476, manufactured by NOF Corporation, fatty acid ester C3: D-1000, manufactured by NOF Corporation, polypropylene glycol, number average molecular weight: 1000

[0072] 2. Examples 1 to 5 and Comparative Examples 1 to 3 <Production of Resin Pellets> Each component was blended in a tumbler to obtain the composition shown in Table 1 below (contents in Table 1 are shown in parts by mass), and the blend was introduced 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 Production> The pellets obtained above were extruded into a molten state using a T-die melt extruder consisting of a vented single-screw extruder (manufactured by 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, and the extruded pellets were pressed between a first roll and a second roll, followed by cooling and solidification 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: UM roll manufactured by Shibaura Machine Co., Ltd. Dimensions: outer diameter 300 mm x roll width 600 mm

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

[0076] <Roll Contamination> After 350 kg of polyamide resin raw material was consumed to produce a film, the first roll and the second roll 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 column "No. 1R Roll Contamination", and the evaluation results for the second roll are shown in the column "No. 2R Roll Contamination". A: No roll contamination was observed, or some roll contamination was observed but was at a practically acceptable level. B: Roll contamination occurred and was beyond the practically acceptable level.

[0077] <Poor shark skin appearance> The film was visually inspected 7 hours after paper feeding 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 was at a practically acceptable level. B: Shark skin-like film surface was observed and was not at a practically acceptable level.

[0078] <Poor Appearance of Stain> The film was visually inspected 7 hours after passing through the paper and evaluated as follows. The evaluation was carried out by five experts and judged by majority vote. A: No stain was observed on the film surface, or some stain was observed on the film surface but was at a practically acceptable level. B: Stain was observed on the film surface and was not at a practically acceptable level.

[0079] <Measurement of Haze and Total Light Transmittance> 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 Co., Ltd.

[0080]

[0081] As is clear from the results in Table 1, the present invention produced films that effectively prevented contamination of the first roll and shark skin on the film surface. 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 on the film surface occurred during film production.

[0082] REFERENCE SIGNS LIST 1 Lens 2 Polarizing film 3 Protective film 4 Protective film 10 Raw material 11 Die 12 First roll 13 Second roll 14 Third roll 15 Dirt

Claims

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 resin composition according to claim 1, wherein the aliphatic dicarboxylic acid units having 7 to 20 carbon atoms include sebacic acid units and / or dodecanedioic acid units.

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 any one of claims 1 to 3, wherein the alicyclic diamine unit includes a unit represented by formula (PA-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 any one of claims 1 to 4, wherein the polyetheramide elastomer contains 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 any one of claims 1 to 6, wherein 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).

8. The resin composition according to any one of claims 1 to 7, wherein the release agent comprises at least one member selected from the group consisting of fatty acid esters, fatty acid amides, and polyalkylene glycols.

9. The resin composition according to any one of claims 1 to 8, wherein the polyamide resin is an amorphous resin.

10. The resin composition according to any one of claims 1 to 9, wherein the haze of the resin composition when molded into a film having a thickness of 300 μm is 3.0% or less.

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

12. The resin composition according to any one of claims 1 to 11, which is used as a protective film for a polarizing sheet.

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 contains a unit represented by formula (PA-1), the polyetheramide elastomer contains a polyalkylene glycol block and a polyamide block, the polyalkylene glycol block contains 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 mass%, the content of the polyetheramide elastomer is 20.0 to 0.1 mass%, and the content of the release agent is 0.001 to 10 mass% (however, the total of the polyamide resin, polyetheramide elastomer, and release agent does not exceed 100 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 according to any one of claims 1 to 12, wherein the resin composition has a haze of 3.0% or less when molded into a film having a thickness of 300 µm, and a total light transmittance of 80% or more when molded into a film having a thickness of 300 µm, and is used for a protective film of a polarizing sheet. (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.

14. A film formed from the resin composition according to any one of claims 1 to 13.

15. A polarizing sheet comprising the film according to claim 14 and a polarizing film.

16. Sunglasses comprising the polarizing sheet according to claim 15.

Images