Resin composition, film, polarization sheet, and sunglass

Abstract

To provide a resin composition which enables provision of a film that is excellent in transparency and can effectively suppress roll contamination when the film is produced, and a film, a polarization sheet and sunglasses.SOLUTION: A resin composition contains a polyamide resin containing an alicyclic diamine unit, an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, and an aminocarboxylic acid unit, and a polyetheramide elastomer.SELECTED DRAWING: None

Description

[Technical field] 【0001】 The present invention relates to a resin composition, a film, a polarizing sheet, and sunglasses, and in particular 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 excellent 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] JP 2015-129271 A [Patent Document 2] JP 2013-001906 A [Patent Document 3] JP 2012-131977 A Summary of the Invention [Problem to be solved by the invention] 【0004】 As described 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 such circumstances, the present inventors have investigated the use of polyamide resins for transparent applications such as protective films for polarizing films, etc. However, it has been found that when polyamide resins are molded into a film, contamination of rolls occurs during the production of the film. The present invention aims to solve such problems, and to provide a resin composition capable of providing a film that has excellent transparency and can effectively suppress roll contamination during film production, as well as a film, a polarizing sheet, and sunglasses. [Means for solving the problem] 【0005】 In light of the above problems, it has been discovered that the above problems can be solved by using a specific polyamide resin and a polyetheramide elastomer. Specifically, the above problems were solved by the following means. <1> A resin composition comprising: a polyamide resin containing an alicyclic diamine unit, an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, and an aminocarboxylic acid unit; and a polyetheramide elastomer. <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> or <2> The resin composition according to claim 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 with another unit or a terminal group. <5> The polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block. <1> ~ <4> 10. The resin composition according to claim 9 . <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 amino carboxylic acid constituting the amino carboxylic acid unit is represented by formula (PA-2), <1> ~ <6> 10. The resin composition according to claim 9 . [ka] (In formula (PA-2), n is an integer of 5 to 20.) <8> The content of the polyamide resin in the resin composition is 80.0 to 99.9 mass %, and the content of the polyetheramide elastomer is 20.0 to 0.1 mass %. <1> ~ <7> 10. The resin composition according to claim 9 . <9> 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 is represented by formula (PA-1), the polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block; the polyalkylene glycol blocks comprise polypropylene glycol (PPG) blocks and / or polytetramethylene ether glycol (PTMG) blocks; The content of the polyamide resin in the resin composition is 80.0 to 99.9 mass %, and the content of the polyetheramide elastomer is 20.0 to 0.1 mass %. <1> ~ <8> 10. The resin composition according to claim 9 . [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 with another unit or a terminal group. <10> The polyamide resin (A) is an amorphous resin. <1> ~ <9> 10. The resin composition according to claim 9 . <11> When the resin composition is molded into a film having a thickness of 300 μm, the haze is 3.0% or less. <1> ~ <10> 10. The resin composition according to claim 9 . <12> When the resin composition is molded into a film having a thickness of 300 μm, the total light transmittance is 80% or more. <1> ~ <11> 10. The resin composition according to claim 9 . <13> For use as a protective film for polarizing sheets. <1> ~ <12> 10. The resin composition according to claim 9 . <14> <1> ~ <13> 2. A film formed from the resin composition according to claim 1. <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. Effect of the Invention 【0006】 The present invention makes it possible to provide a resin composition capable of providing a film that is excellent in transparency and can effectively suppress roll contamination during the production of the film, as well as a film, a polarizing sheet, and sunglasses. [Brief description of the drawings] 【0007】 [Figure 1] FIG. 2 is a schematic diagram for explaining an example of a layer structure of the hot-bent molded body of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 【0008】 Hereinafter, an embodiment of 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 the present embodiment. In this specification, the use of "to" means that the numerical values ​​before and after it are included as the lower limit and upper limit. 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 the description does not indicate whether the group is substituted or unsubstituted, the description also includes groups (atomic groups) that have a substituent as well as groups (atomic groups) that have no substituent. For example, the term "alkyl group" includes not only alkyl groups that have no substituent (unsubstituted alkyl groups), but also alkyl groups that have a substituent (substituted alkyl groups). In this specification, when the description does not indicate whether the group is substituted or unsubstituted, the description is preferably 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 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. 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】 The term "film" as used herein refers to a generally flat molded body having a small thickness relative to its length and width, and is intended to include a sheet. 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 vary from year to year, they will be based on the standards as of January 1, 2023, unless otherwise stated. Figure 1 may not be to scale and may not correspond to reality. 【0010】 The resin composition of the present embodiment is characterized by including a polyamide resin containing an alicyclic diamine unit, an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, and an aminocarboxylic acid unit, and a polyetheramide elastomer. By adopting such a constitution, a resin composition capable of providing a film having excellent transparency and capable of effectively suppressing roll contamination during the production of the film can be obtained. When the polyamide resin contains an alicyclic diamine unit, a resin composition having excellent transparency can be obtained. On the other hand, polyamide resins, especially decomposition products of polyamide resins, tend to adhere to metals and are likely to cause roll contamination during film production. In the polyamide resin used in this embodiment, components derived from aliphatic dicarboxylic acid units and aminocarboxylic acid units having 7 to 20 carbon atoms are likely to adhere to the roll. In this embodiment, it is presumed that the incorporation of a polyetheramide elastomer effectively inhibits 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, in this embodiment, the compatibility of the aliphatic dicarboxylic acid units having 7 to 20 carbon atoms of the polyamide resin with the polyetheramide elastomer (particularly, the polyalkylene glycol block) allows the transparency to be maintained at a high level. 【0011】 <Polyamide resin containing alicyclic diamine units, aliphatic dicarboxylic acid units having 7 to 20 carbon atoms, and aminocarboxylic acid units> The resin composition of the present embodiment contains a polyamide resin (sometimes referred to as "polyamide resin (A)" in this specification) that contains an alicyclic diamine unit, an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms, and an aminocarboxylic acid unit. 【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. The alicyclic diamine more preferably contains two substituted or unsubstituted cyclohexane rings. The alicyclic diamine unit preferably does not contain a carbon-carbon double bond and a carbon-carbon triple bond. In addition, the alicyclic diamine is preferably composed only of an aliphatic hydrocarbon group containing an alicyclic structure, except for the terminal amino group. 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. In this embodiment, the alicyclic diamine unit is more preferably represented by formula (PA-0). [ka] (In formula (PA-0), R is each independently a substituent, and n is each 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, still more preferably a methyl group, an ethyl group or a propyl group, and even more preferably a methyl group. In formula (PA-0), each n is 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 still more preferably an integer of 1 or less. In formula (PA-0), L is 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 other units or terminal groups, i.e., usually bonding with -C(=O)- to form an amide bond together with NH in formula (PA-0), bonding with a hydrogen atom to form a terminal amino group together with NH in formula (PA-0), or bonding with a terminal group. 【0013】 In this embodiment, the alicyclic diamine unit is more preferably represented by formula (PA-1). [ka] (In formula (PA-1), R1 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. 【0014】 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 preferably an integer of 2 or less. 【0015】 Specific examples of alicyclic diamines 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. 【0016】 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. The alicyclic diamine units may be one type or a combination of two or more types. 【0017】 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. 【0018】 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-(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 the present 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. 【0019】 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 a combination of two or more types. 【0020】 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 acids 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. These can be used alone or in combination of two or more kinds. 【0021】 In the present embodiment, the type of amino carboxylic acid constituting the amino carboxylic acid unit is not particularly limited, and any known amino carboxylic acid can be used. The amino carboxylic acid is preferably composed only of an aliphatic hydrocarbon group, except for the terminal amino group and carboxylic acid group. The molecular weight of the amino carboxylic acid constituting the amino carboxylic 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. 【0022】 The amino carboxylic acid constituting the amino carboxylic 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 from 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. 【0023】 Although the polyamide resin (A) contains diamine units, dicarboxylic acid units, and aminocarboxylic acid units, it does not completely exclude other monomer units, and it goes without saying that it may contain lactam units such as ε-caprolactam and laurolactam. In this embodiment, among the monomer units constituting the polyamide resin (A), the total number of diamine units, dicarboxylic acid units, and 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. In the polyamide resin (A), the molar ratio of diamine units to dicarboxylic acid units is preferably from 40:60 to 60:40, and more preferably from 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. 【0024】 The polyamide resin (A) is preferably an amorphous resin. An amorphous resin is a resin that does not have a clear melting point, specifically, a crystalline melting enthalpy ΔHm of less than 5 J / g, preferably 3 J / g or less, more preferably 1 J / g or less. The crystalline melting enthalpy ΔHm is measured in the heating process according to JIS K7121 and K7122. Specifically, the polyamide resin is heated in a nitrogen gas flow from room temperature to 250° C. at a heating rate of 10° C. / min using a differential scanning calorimeter (DSC), immediately cooled to below room temperature, and then heated again from room temperature to 250° C. at a heating rate of 10° C. / min. The value is the value measured. 【0025】 It is also preferable to use polyamide resin (A) manufactured using biomass raw materials (biomass polyamide resin). By using biomass polyamide resin, it is possible to reduce the environmental impact. For polyamide resin (A), mass balance certified (ISCC PLUS) monomer raw materials can also be used. Mass balance certification means that the amount of renewable raw materials and bio raw materials used in each factory or production facility and the amount of products produced or shipped are quantified and guaranteed together with the quality. In addition, the polyamide resin (A) may be a recycled product (including recovered products, material recycled products, chemical recycled products, etc.), a rejected product, or scraps generated during molding of the polyamide resin (A) or the resin composition of the present embodiment. 【0026】 The content of the polyamide resin (A) in the resin composition of this embodiment is preferably 80.0% by mass or more, more preferably 85.0% by mass or more, even more preferably 87.0% by mass or more, even more preferably 90.0% by mass or more, even more preferably 93.0% by mass or more, and even more preferably 94.0% by mass or more, based on 100% by mass of the resin composition. By making it equal to or more than the lower limit, the glass transition temperature of the obtained film tends to be higher. In addition, the content of the polyamide resin (A) in the resin composition of this embodiment is preferably 99.9% by mass or less, more preferably 99.5% by mass or less, based on 100% by mass of the resin composition. By making it equal to or less than the upper limit, the impact strength of the obtained film tends to be 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. 【0027】 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 and aromatic polyamide resins other than the polyamide resin (A). Examples of aliphatic polyamide resins include polyamide 4, polyamide 46, polyamide 6, polyamide 66, polyamide 666, polyamide 610, polyamide 11, polyamide 116, polyamide 12, polyamide 612, and the like. 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, xylylenediamine-based polyamide resins (such as MXD6), and the like. 【0028】 As the aliphatic polyamide resin and aromatic polyamide resin, it is also preferable to use a polyamide resin produced using recycled resin or biomass raw material (biomass thermoplastic resin). In addition, the resin composition of the present 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 the present embodiment is preferably less than 10 mass%, more preferably less than 5 mass%, even more preferably less than 3 mass%, even more preferably less than 1 mass%, and even more preferably less than 0.1 mass%, based on 100 mass% of the resin composition. 【0029】 <Polyetheramide elastomer> The resin composition of the present embodiment contains a polyetheramide elastomer. By containing the polyetheramide elastomer, roll contamination during film production can be effectively suppressed. Furthermore, the haze can also be reduced. The polyetheramide elastomer is an elastomer containing a polyether structure and a polyamide structure. The polyetheramide elastomer in the present embodiment is substantially free of an ester structure. Substantially free of an ester structure means that it is not a polyesteretheramide elastomer, and more specifically, the content of the ester structure is usually less than 1 mass % of the polyetheramide elastomer, preferably less than 0.5 mass %, more preferably less than 0.1 mass %, and even more preferably less than 0.01 mass %. The polyetheramide elastomer used in this embodiment preferably contains a polyalkylene glycol block and a polyamide block. 【0030】 The polyalkylene glycol block is -(alkylene group -O) n2 It is preferable that the -(alkylene group -O) is represented by -. n2The 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 above-mentioned -(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 O)-, and combinations of two or more of these are also possible. The -(alkylene group -O) n2 In the -, n2 is preferably 1 to 200, and more preferably 3 to 100. The polyalkylene glycol blocks preferably comprise polypropylene glycol (PPG) blocks and / or polytetramethylene ether glycol (PTMG) blocks. 【0031】 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, and may be 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 65 mol% or more, depending on the application. By making it equal to or more than the lower limit, the effect of improving impact strength when added to a polyamide resin tends to be more improved. In addition, 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 the total structural units of the polyetheramide elastomer. By making it equal to or less than the upper limit, it tends to be compatible with amorphous polyamide resins. 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. 【0032】 The polyamide blocks are preferably represented by aliphatic polyamide blocks, -(NH(CH 2 ) n3 C(=O)) n4 In this case, 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. In addition, when the number of carbon atoms of the aliphatic dicarboxylic acid having 7 to 20 carbon atoms constituting the polyamide resin (A) is n5 (for example, in the case of sebacic acid, n5=10), 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. 【0033】 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 the total structural units of the polyetheramide elastomer. By making it equal to or more than the lower limit, the effect of improving compatibility with amorphous polyamide tends to be more improved. In addition, 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 the total structural units of the polyetheramide elastomer, and may be 70 mol% or less, 60 mol% or less, 50 mol% or less, 40 mol% or less, or 35 mol% or less depending on the application. By making it equal to or less than the upper limit, the effect of suppressing the decrease in glass transition temperature when added to a polyamide resin tends to be more improved. 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 within the above range. 【0034】 The weight average molecular weight of the polyetheramide elastomer used in the present embodiment is preferably 3000 or more, more preferably 5000 or more, and is preferably 100000 or less, more preferably 80000 or less. By making it equal to or more than the lower limit, the toughness when mixed with the polyamide resin tends to be improved. By making it equal to or less than the upper limit, the compatibility with the polyamide resin tends to be further improved. The weight average molecular weight is an acrylic equivalent value measured by GPC (gel permeation chromatography). 【0035】 In the polyetheramide elastomer used in the present embodiment, the total of the polyalkylene glycol block and the polyamide block is preferably 90 mass% or more, more preferably 95 mass% or more, and even more preferably 97 mass% or more, and is preferably 100 mass% or less, based on 100 mass% of the polyetheramide elastomer. 【0036】 The content of the polyetheramide elastomer in the resin composition of the present 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, and from the viewpoint of more effectively suppressing roll staining, it is even more preferably 2.0% by mass or more, and even more preferably 3.0% by mass or more, relative to 100% by mass of the resin composition. The content of the polyetheramide elastomer in the resin composition of the present 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, and from the viewpoint of further improving transparency, it is even more preferably 3.0% by mass or less, and particularly more preferably 2.0% 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. 【0037】 In the resin composition of the present embodiment, the content of the polyamide resin (A) in the resin composition is preferably 80.0 to 99.9 mass %, and the content of the polyetheramide elastomer is preferably 20.0 to 0.1 mass %. 【0038】 In the resin composition of this embodiment, the total of the polyamide resin (A) and the polyetheramide elastomer preferably accounts for 90 mass% or more, more preferably 95 mass% or more, even more preferably 97 mass% or more, and even more preferably 99 mass% or more, of 100 mass% of the resin composition. 【0039】 <Other ingredients> The resin composition of the present embodiment may or may not contain components other than the polyamide resin (A) and the polyetheramide elastomer. Examples of other components include ultraviolet absorbers, antioxidants, release agents, 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 JP-A-2023-61203, within the scope of the spirit of the present invention, and the contents of these are incorporated herein by reference. 【0040】 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. 【0041】 <Physical properties of resin composition> The resin composition of the present embodiment preferably has excellent transparency. Specifically, the resin composition of the present embodiment has a total light transmittance of preferably 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 satisfied even if it is 99% or less. Furthermore, the resin composition of this embodiment preferably has a haze of 3.0% or less when molded to a thickness of 300 μm, more preferably 2.5% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, even more preferably 1.2% or less, and even more preferably 1.0% or less. The lower limit of the haze is preferably 0%, but the required performance is satisfied even if it is 0.001% or more. The total light transmittance and haze are measured according to the description in the Examples section below. 【0042】 <Method of producing resin composition> As a method for producing the resin composition of the present embodiment, any method may be adopted. For example, it can be obtained by adding polyamide resin (A) and polyetheramide elastomer and melt-kneading them. More specifically, the polyamide resin (A), polyetheramide elastomer, and other components added as necessary are mixed using a mixing means such as a V-type blender to prepare a lump-sum blend, which is then melt-kneaded in a vented extruder and pelletized. 【0043】 <Film> The film of this embodiment is formed from the film of this embodiment. The thickness of the film in 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. 【0044】 The film of the present embodiment preferably has excellent transparency. Specifically, the film of the present embodiment has a total light transmittance of preferably 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 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 2.5% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, even more preferably 1.2% or less, and even more preferably 1.0% or less. The lower limit of the haze is preferably 0%, but the required performance is satisfied even if it is 0.001% or more. The total light transmittance and haze are measured according to the description in the Examples section below. 【0045】 <Wound body> The film of the present embodiment can be wound around a core material to form a roll. 【0046】 <Polarizing sheet> A film formed from the resin composition of the present embodiment or the film of the present 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 of 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, one of the protective films of the polarizing sheet may be the film of this embodiment, or may be another protective film. The other protective film of the polarizing sheet may be a known protective film of a polarizing sheet, and may be the same as the film of this embodiment. The polarizing film may be a known one, and an example thereof is a polyvinyl alcohol (PVA) film in which iodine or a dichroic organic dye is adsorbed or impregnated. The adhesive for bonding the film / protective film and the polarizing film of the present embodiment can be a known adhesive, and examples of such adhesives 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. In addition, the polarizing sheet of the present embodiment may further include a masking film or the like provided on the outer side of the protective film. 【0047】 In the present embodiment, the polarizing sheet of the present embodiment is preferably used for a heat-bent product that has been subjected to heat bending processing. When the film of the present embodiment is used in a polarizing sheet, it may be provided on either side of a polarizing film, or on both sides. The first mode is that the film of this embodiment is disposed so as to be located on the concave side of the polarizing film after heat bending processing, for example, on the side of protective film 4 in FIG. In the second embodiment, the film of this embodiment is disposed so as to be located on the convex side of the polarizing film after heat bending processing, for example, on the side of protective film 3 in FIG. In the third embodiment, the film of this embodiment is positioned on both sides of a polarizing film, for example, both of protective films 3 and 4 in FIG. 1 are the film of this embodiment. In FIG. 1, the lens 1, the polarizing film 2, and the protective films 3 and 4 of the polarizing sheet are bent, but it goes without saying that this embodiment also includes a case where they are not bent. The protective film used in the polarizing sheet of the present embodiment may be stretched or may not be stretched. In the first embodiment, it is preferably stretched. In the second embodiment, it is preferably not stretched. 【0048】 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. EXAMPLES 【0049】 The present invention will be described in more detail below with reference to examples. The materials, amounts, ratios, processing contents, 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. 【0050】 1. Raw materials A1: 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%), an amorphous polyamide resin B1: 9040X1, a polyetheramide elastomer composed of 19 mol% polyamide 12, 50 mol% PTMG, and 31 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 B3: PA-50M, polymerized fatty acid polyamide resin, manufactured by T&K TOKA 【0051】 2. Examples 1 and 2, Comparative Examples 1 and 2 <Production of resin pellets> The components were blended in a tumbler to obtain the composition shown in Table 1 below (the contents are shown in parts by mass in Table 1), and the blend was fed into the base of a twin-screw extruder (TEX30α, manufactured by Japan Steel Works, Ltd.) and melt-kneaded at a cylinder temperature of 280°C to produce pellets for the examples and comparative examples. 【0052】 <Film manufacturing> The pellets obtained above were extruded into a molten state using a T-die melt extruder consisting of a vented twin-screw extruder with a barrel diameter of 32 mm and a screw L / D of 31.5 (manufactured by Japan Steel Works, Ltd., "TEX30α") ​​at a discharge rate of 15 kg / h and a screw rotation speed of 250 rpm, and then cooled and solidified to produce a film. The cylinder temperature was 280°C and the roll temperature was 120°C. A film with a thickness of 300 μm was obtained. 【0053】 <Roll stains> After 30 kg of raw material was consumed to produce a film, the roll was visually evaluated as follows: Example 1 was given a grade of "B" and judged by majority vote of five experts. A: No stains on the roll were observed. B: Some roll staining was observed, but at a level that was still usable. C: Roll contamination occurred, beyond the practical level. 【0054】 <Haze and total light transmittance measurements> The haze (%) and total light transmittance (%) of the 300 μm thick film obtained above were measured using a haze meter under conditions of a D65 light source and a 10° visual field. The haze meter used was "HM-150" manufactured by Murakami Color Research Laboratory. 【0055】 [Table 1] 【0056】 In the above Table 1, B3 is a polymerized fatty acid polyamide resin and does not fall under the category of polyetheramide elastomer. As is clear from the above results, the film formed from the resin composition of the present invention was excellent in transparency, and roll contamination during production was effectively suppressed. In contrast, when only the polyamide resin (A) was used (Comparative Example 1), or when a substitute for the polyetheramide elastomer was used (Comparative Example 2), roll contamination occurred during film production. [Explanation of symbols] 【0057】 1 Lens 2. Polarizing film 3 Protective film 4 Protective film

Claims

[Claim 1] A resin composition comprising a polyamide resin containing alicyclic diamine units, aliphatic dicarboxylic acid units having 7 to 20 carbon atoms, and aminocarboxylic acid units, and a polyetheramide elastomer. [Claim 2] The resin composition according to claim 1, wherein the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms comprises a sebaciate unit and / or a dodecanediate unit. [Claim 3] The resin composition according to claim 1 or 2, wherein the alicyclic diamine constituting the alicyclic diamine unit comprises two substituted or unsubstituted cyclohexane rings. [Claim 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 Each of these is an alkyl group having 1 to 5 carbon atoms, and each of these is an integer from 0 to 3. * indicates a bonding site with another unit or terminal group. [Claim 5] The resin composition according to claim 1 or 2, wherein the polyetheramide elastomer comprises a polyalkylene glycol block and a polyamide block. [Claim 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. [Claim 7] The resin composition according to claim 1 or 2, wherein the aminocarboxylic acid constituting the aminocarboxylic acid unit is represented by formula (PA-2). 【Chemistry 2】 (In equation (PA-2), n is an integer between 5 and 20.) [Claim 8] The resin composition according to claim 1 or 2, wherein the content of the polyamide resin in the resin composition is 80.0 to 99.9% by mass, and the content of the polyetheramide elastomer is 20.0 to 0.1% by mass. [Claim 9] The aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms includes a sebaciate unit and / or a dodecanediate unit. The aforementioned alicyclic diamine unit is 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 resin composition according to claim 1, wherein the content of the polyamide resin in the resin composition is 80.0 to 99.9% by mass, and the content of the polyetheramide elastomer is 20.0 to 0.1% by mass. 【Transformation 3】 (In formula (PA-1), R １ Each of these is an alkyl group having 1 to 5 carbon atoms, and each of these is an integer from 0 to 3. * indicates a bonding site with another unit or terminal group. [Claim 10] The resin composition according to claim 1, 2, or 9, wherein the polyamide resin is an amorphous resin. [Claim 11] The resin composition according to claim 1, 2, or 9, wherein the haze when the resin composition is formed into a film with a thickness of 300 μm is 3.0% or less. [Claim 12] The resin composition according to claim 1, 2, or 9, wherein the total light transmittance when the resin composition is formed into a film with a thickness of 300 μm is 80% or more. [Claim 13] A resin composition according to claim 1, 2, or 9, for use as a protective film for polarizing sheets. [Claim 14] A film formed from the resin composition according to claim 1, 2, or 9. [Claim 15] A polarizing sheet comprising the film described in claim 14 and a polarizing film. [Claim 16] Sunglasses comprising the polarizing sheet described in claim 15.

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