Resin composition, film, polarizing plate, and sunglasses

Abstract

The present application provides a resin composition, a film, a polarizing plate, and sunglasses. The resin composition contains a polyamide resin, a polyether amide elastomer, and a release agent, the polyamide resin containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms.

Description

Technical Field

[0001] This invention relates to resin compositions, films, polarizing filters, and sunglasses. In particular, it relates to resin compositions with polyamide resin as the main component. Background Technology

[0002] Polyamide resins are widely used in many fields such as electrical, electronic, automotive, machinery, and building materials due to their excellent mechanical properties such as rigidity and strength, as well as heat resistance (Patent Documents 1-3).

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2015-129271 Patent Document 2: Japanese Patent Application Publication No. 2013-001906 Patent Document 3: Japanese Patent Application Publication No. 2012-131977 Summary of the Invention

[0004] The technical problem that the invention aims to solve As mentioned above, polyamide resins have been used in various fields, but they are generally resins with poor transparency and cannot be used for applications requiring transparency.

[0005] Under these circumstances, the inventors of this invention investigated the use of polyamide resin in applications requiring transparency, such as protective films for polarizing films. However, when molding polyamide resin into a film, contamination sometimes occurs on the rollers during film manufacturing, and the film surface sometimes becomes sharkskin-like.

[0006] This invention was made to solve such a technical problem, and its purpose is to provide a resin composition, a film, a polarizer, and sunglasses, wherein the resin composition can effectively suppress contamination of the first roller and the formation of a sharkskin-like film surface during film manufacturing.

[0007] Technical solutions for solving technical problems Based on the above-mentioned technical problems, the inventors of this invention conducted research and found that by combining polyetheramide elastomer and release agent in a specified polyamide resin, the above-mentioned technical problems can be solved.

[0008] Specifically, the above-mentioned technical problems were solved using the following solution.

[0009] <1> A resin composition comprising a polyamide resin, a polyetheramide elastomer, and a release agent, wherein the polyamide resin comprises an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms.

[0010] <2> The resin composition as described in <1>, wherein the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms comprises sebacic acid unit and / or dodecanoic acid unit.

[0011] <3> The resin composition as described in <1> or <2>, wherein the alicyclic diamine constituting the above-mentioned alicyclic diamine unit comprises two substituted or unsubstituted cyclohexane rings.

[0012] <4> The resin composition as described in any one of <1> to <3>, wherein the above-mentioned alicyclic diamine unit comprises the unit shown in formula (PA-1). (In formula (PA-1), R) 1 Each alkyl group has 1 to 5 carbon atoms, and n1 is an integer from 0 to 3. * indicates the bonding site with other units or terminal groups. <5> The resin composition as described in any one of <1> to <4>, wherein the polyether amide elastomer comprises a polyalkylene glycol block and a polyamide block.

[0013] <6> The resin composition as described in <5>, wherein the polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block.

[0014] <7> The resin composition as described in 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 polyether amide elastomer is 20.0 to 0.1% by mass, and the content of the release agent is 0.001 to 10% by mass (wherein the total of the polyamide resin, polyether amide elastomer and release agent is not greater than 100% by mass).

[0015] <8> The resin composition as described in any one of <1> to <7>, wherein the release agent comprises at least one selected from fatty acid esters, fatty amides and polyalkylene glycols.

[0016] <9> The resin composition as described in any one of <1> to <8>, wherein the polyamide resin is an amorphous resin.

[0017] <10> The resin composition as described in any one of <1> to <9>, wherein the haze is 3.0% or less when the resin composition is molded into a film with a thickness of 300 μm.

[0018] <11> The resin composition as described in any one of <1> to <10>, wherein the total light transmittance when the resin composition is molded into a film with a thickness of 300 μm is 80% or more.

[0019] <12> The resin composition as described in any one of <1> to <11> is used as a protective film for polarizing films.

[0020] <13> The resin composition as described in any one of <1> to <12>, wherein the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms comprises sebacic acid unit and / or dodecanoic acid unit, The aforementioned alicyclic diamine unit includes the unit shown in formula (PA-1). The aforementioned polyetheramide elastomer comprises polyalkylene glycol blocks and polyamide blocks. The aforementioned polyalkylene glycol blocks include polypropylene glycol (PPG) blocks and / or polytetramethylene ether glycol (PTMG) blocks. The content of the polyamide resin in the above 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 (wherein, the total of the polyamide resin, polyetheramide elastomer and release agent is not greater than 100% by mass). The aforementioned release agent contains at least one selected from fatty acid esters, fatty amides, and polyalkylene glycols. The aforementioned polyamide resin is an amorphous resin. When the above resin composition is molded into a film with a thickness of 300 μm, the haze is less than 3.0%. When the above resin composition is molded into a film with a thickness of 300 μm, the total light transmittance is 80% or more. The above resin composition is used as a protective film for polarizers. (In formula (PA-1), R) 1 Each alkyl group has 1 to 5 carbon atoms, and n1 is an integer from 0 to 3. * indicates the bonding site with other units or terminal groups. <14> A membrane formed from any one of the resin compositions described in <1> to <13>.

[0021] <15> A polarizer comprising the film described in <14> and a polarizing film.

[0022] <16> A pair of sunglasses comprising the polarizing film described in <15>.

[0023] Invention Effects The present invention can provide resin compositions, films, polarizers and sunglasses, wherein the resin compositions can provide films that can effectively suppress contamination of the first roller and the formation of a sharkskin-like film surface during film manufacturing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the manufacturing process of the membrane involved in this invention.

[0025] Figure 2 This is a schematic diagram illustrating an example of the layered structure of a thermoformed body according to this embodiment. Detailed Implementation

[0026] The following describes in detail specific embodiments of the present invention (hereinafter referred to as "this embodiment"). These embodiments are merely examples used to illustrate the present invention, and the present invention is not limited to these embodiments.

[0027] Furthermore, the use of “~” in this specification is intended to indicate that the values ​​before and after it are lower and upper limits. Additionally, the upper and lower limits of the values ​​in this specification are provided as examples of any combination of the aforementioned upper and lower limits, serving as an example of this embodiment.

[0028] Unless otherwise specified, all physical property values ​​and characteristic values ​​in this manual are values ​​at 23°C.

[0029] In this specification, the description of groups (atomic groups) without specifying substitution and unsubstituent includes both unsubstituent and substituent groups (atomic groups). For example, "alkyl" includes not only unsubstituent alkyl groups (unsubstituted alkyl groups) but also substituent alkyl groups (substituted alkyl groups). In this specification, the description without specifying substitution and unsubstituent is preferred to be unsubstituent.

[0030] Examples of substituents used in this specification are preferably halogen atoms, cyano, nitro, hydroxyl, alkyl, alkoxy, aryl, aryloxy, heterocyclic, heterocyclic, alkenyl, alkylthio, arylthio, acyl, or amino; more preferably halogen atoms, alkyl, alkoxy, aryl, aryloxy, alkenyl, or acyl; even more preferably alkyl, aryl, aryloxy, or alkenyl; and even more preferably alkyl. The formula weight of these substituents is preferably 15 or more, and preferably 200 or less. For example, a formula weight of 15 is used for methyl (-CH3). These substituents may further have substituents, but it is preferable that they do not have substituents.

[0031] In this specification, "film" refers to a molded article that is thin and generally flat relative to its length and width, and also includes sheets. Furthermore, the term "film" in this specification can refer to a single layer or multiple layers, with a single layer being preferred.

[0032] The test methods described in the standards shown in this specification may vary from year to year. Unless otherwise stated, all methods are based on the standards as of January 1, 2024. If the test methods described in the standards shown in this specification are obsolete as of January 1, 2024, the standards at the time of obsolescence shall apply.

[0033] Figure 1 and 2 In some cases, the scale and other parameters may not match reality.

[0034] The resin composition of this embodiment is characterized in that it contains a polyamide resin, a polyetheramide elastomer, and a mold release agent, wherein the polyamide resin comprises an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms.

[0035] By adopting such a configuration, it is possible to obtain a method that can effectively suppress the first roller (e.g., during film manufacturing). Figure 1 Pollution of 12 in the middle (e.g.) Figure 1 15) and a resin composition of a membrane whose surface becomes sharkskin-like.

[0036] The resin composition of this embodiment, for example, uses Figure 1 The device shown is manufactured. That is, Figure 1 This is a schematic diagram showing the manufacturing process of the membrane involved in this invention. 10 represents the raw material, 11 represents the die, 12 represents the first roller, 13 represents the second roller, 14 represents the third roller, and 15 represents contamination.

[0037] The first roller 12 has a shorter contact time with the membrane material 10, therefore it is considered to be more prone to contamination 15 compared to the second roller 13. In addition, the material 10 is cooled and solidified before contacting the third roller 14, so contamination of the third roller 14 is almost non-existent.

[0038] Improving the roll fouling 15 of both the first roll 12 and the second roll 13 is crucial for obtaining a film with a good appearance.

[0039] The contamination of the first roller is presumably caused by, for example, polyamide resin remaining inside the die and adhering to the metal wall during extrusion molding, leading to resin decomposition. Regarding the sharkskin-like appearance on the film surface, it is thought to be due to the polyamide resin easily adhering to the metal wall inside the die, resulting in uneven resin flow within the die. The inventors of this invention, through research, discovered that by using a polyetheramide elastomer and a release agent, the polyamide resin is less likely to adhere to the metal wall inside the die, thus effectively suppressing contamination of the first roller and the sharkskin-like appearance of the film surface. This is presumably because, by combining the polyetheramide elastomer and the release agent, the adhesion of components from aliphatic dicarboxylic acid units or aminocarboxylic acid units with 7 to 20 carbon atoms to the roller can be effectively suppressed during film manufacturing. Consequently, the release agent is more likely to be present on the metal wall side inside the die in the resin composition, resulting in improved peelability between the roller surface or the inner surface of the die and the film. It can be inferred that by using polyetheramide elastomer and release agent, a resin composition can be obtained that can effectively suppress contamination of the first roller and prevent the membrane surface from becoming sharkskin-like during membrane manufacturing.

[0040] The following is a detailed description of this embodiment.

[0041] <Polyamide resins containing alicyclic diamine units and aliphatic dicarboxylic acid units with 7 to 20 carbon atoms> The resin composition of this embodiment contains a polyamide resin comprising an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms (sometimes referred to as "polyamide resin (A)" in this specification).

[0042] The alicyclic structure of polyamide resin (A) can improve the transparency of the polyamide resin itself, and can also improve the compatibility of aliphatic dicarboxylic acid units with 7 to 20 carbon atoms with polyalkylene glycols, thereby improving the transparency of the resin composition.

[0043] In this embodiment, the alicyclic diamine constituting the alicyclic diamine unit is preferably a diamine containing a 5-membered ring and / or a 6-membered ring. The 5-membered and / or 6-membered rings may or may not have substituents. Furthermore, the alicyclic diamine, except for the terminal amino group, is preferably composed only of aliphatic hydrocarbon groups containing an alicyclic structure.

[0044] The aforementioned alicyclic diamine unit more preferably contains 2 to 3 or more substituted or unsubstituted cyclohexane rings in one unit, and even more preferably contains 2 substituted or unsubstituted cyclohexane rings. The alicyclic diamine unit preferably does not contain carbon-carbon double bonds or carbon-carbon triple bonds.

[0045] The alicyclic diamine constituting the alicyclic diamine unit preferably has a molecular weight of 195 or more, more preferably 200 or more, and more preferably 500 or less, more preferably 400 or less, and even more preferably 300 or less.

[0046] In this embodiment, the alicyclic diamine unit is more preferably included in at least one of the formulas (PA-O). (In formula (PA-0), R represents each substituent independently, and n represents each integer from 0 to 5 independently. L represents a single bond or a divalent linker. * indicates the bonding site with other units or terminal groups.) In formula (PA-0), R is a substituent, preferably an aliphatic group with 1 to 6 carbon atoms, more preferably an alkyl group with 1 to 6 carbon atoms, even more preferably a straight-chain or branched alkyl group with 1 to 6 carbon atoms, even more preferably methyl, ethyl or propyl, and even more preferably methyl.

[0047] In formula (PA-0), n is an integer from 0 to 5, preferably an integer of 1 or more, and more preferably an integer of 4 or less, more preferably an integer of 3 or less, even more preferably an integer of 2 or less, and even more preferably an integer of 1 or less.

[0048] In formula (PA-0), L is a single bond or a divalent linker, 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 with 1 to 3 carbon atoms, even more preferably a single bond, methylene, ethylene or isopropylene, and even more preferably methylene.

[0049] * indicates the bonding site with other units or terminal groups. That is, it is usually bonded with -C (=O)-, forming an amide bond with NH in formula (PA-0), or bonded with a hydrogen atom, forming a terminal amino group with NH in formula (PA-0), or bonded with a terminal group.

[0050] In this embodiment, the alicyclic diamine unit is more preferably the unit represented by formula (PA-1). (In formula (PA-1), R) 1 Each alkyl group has 1 to 5 carbon atoms, and n1 is an integer from 0 to 3. * indicates the bonding site with other units or terminal groups. In formula (PA-1), R 1 It is an alkyl group having 1 to 5 carbon atoms, preferably a straight-chain or branched alkyl group having 1 to 5 carbon atoms, more preferably methyl, ethyl or propyl, and even more preferably methyl.

[0051] In formula (PA-1), n1 is an integer from 0 to 3, preferably an integer of 1 or more, and more preferably an integer of 2 or less, and even more preferably 1.

[0052] 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)decahydronaphthalene, and bis(aminomethyl)tricyclodecane.

[0053] The polyamide resin (A) contains alicyclic diamine units in a proportion preferably 75 mol% or more, more preferably 80 mol% or more, further preferably 85 mol% or more, further preferably 90 mol% or more, even more preferably 95 mol% or more, particularly more preferably 99 mol% or more, and less than 100 mol% of the diamine units constituting the polyamide resin (A). The alicyclic diamine unit may be one type or a combination of two or more types.

[0054] Regarding diamines other than alicyclic diamines that can be used as raw materials for polyamide resin (A), examples include aliphatic diamines such as tetramethylenediamine, pentamethylenediamine, 2-methylpentanediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, dodecamethylenediamine, 2,2,4-trimethyl-hexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, phenylenediamine, bis(4-aminophenyl) ether, p-phenylenediamine, bis(aminomethyl)naphthalene, etc., which have aromatic rings. One type can be used, or two or more types can be mixed.

[0055] On the other hand, in this embodiment, the aliphatic dicarboxylic acid unit constituting 7 to 20 carbon atoms is preferably a straight-chain or branched aliphatic dicarboxylic acid with 7 to 20 carbon atoms, more preferably a straight-chain aliphatic dicarboxylic acid with 7 to 20 carbon atoms, and even more preferably an α,ω-straight-chain aliphatic dicarboxylic acid with 7 to 20 carbon atoms. The aforementioned aliphatic dicarboxylic acid with 7 to 20 carbon atoms (preferably a straight-chain aliphatic dicarboxylic acid with 7 to 20 carbon atoms) preferably has 8 or more carbon atoms, more preferably 9 or more, even more preferably 10 or more, and 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 with 7 to 20 carbon atoms is preferably HOOC-(CH2). n -COOH represents the expression. n in the formula is an integer from 5 to 18.

[0056] As the aliphatic dicarboxylic acid unit with 7 to 20 carbon atoms that can be used in this embodiment, it is preferable to include at least one of sebacic acid unit, undecanoic acid unit and dodecanoic acid unit, and more preferably, it includes sebacic acid unit and / or dodecanoic acid unit.

[0057] The polyamide resin (A) contains aliphatic dicarboxylic acid units with 7 to 20 carbon atoms in a proportion of preferably 75 mol% or more, more preferably 80 mol% or more, further preferably 85 mol% or more, further preferably 90 mol% or more, even more preferably 95 mol% or more, particularly more preferably 99 mol% or more, and less than 100 mol% of the dicarboxylic acid units constituting the polyamide resin (A). The aliphatic dicarboxylic acid units with 7 to 20 carbon atoms can be one type or a combination of two or more types.

[0058] Examples of dicarboxylic acids other than aliphatic dicarboxylic acids with 7 to 20 carbon atoms include phthalic acid compounds such as isophthalic acid, terephthalic acid, and phthalic 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. One type can be used, or two or more types can be used in combination.

[0059] The polyamide resin (A) used in this embodiment may also contain aminocarboxylic acid units. By including aminocarboxylic acid units, the hue of molded articles such as films tends to be further improved.

[0060] 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 only of aliphatic hydrocarbon groups, except for the terminal amino and carboxylic acid groups.

[0061] 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.

[0062] 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 from 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, even more preferably 9 or more, even more preferably 10 or more, and 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.

[0063] Furthermore, the polyamide resin (A) contains diamine units and dicarboxylic acid units as main components, but monomer units other than these units are not completely excluded. Of course, it may also contain lactam units such as ε-caprolactam or laurolactam, aliphatic aminocarboxylic acid units such as aminocaproic acid and aminoundecanoic acid. The polyamide resin (A) used in this embodiment is particularly preferably containing aminocarboxylic acid units.

[0064] In this embodiment, in the monomer units constituting the polyamide resin (A), the total mass of the diamine unit, the dicarboxylic acid unit, and the aminocarboxylic acid unit included as needed preferably accounts for 90% or more of all monomer units, more preferably 95% or more, even more preferably 97% or more, and even more preferably 99% or more.

[0065] The molar ratio of diamine units to dicarboxylic acid units in polyamide resin (A) is preferably 40:60 to 60:40, more preferably 45:55 to 55:45.

[0066] In addition, in this embodiment, when the polyamide resin (A) contains aminocarboxylic acid units, the proportion of aminocarboxylic acid units in all monomer units constituting the polyamide resin (A) is preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 10 mol% or more, and 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.

[0067] The polyamide resin (A) is preferably an amorphous resin. An amorphous resin is a resin without a defined melting point, specifically defined as one with a crystallization enthalpy of melting ΔHm less than 5 J / g, preferably 3 J / g or less, and more preferably 1 J / g or less. The crystallization enthalpy of melting ΔHm is determined based on JIS K7121 and K7122, during the heating process. Specifically, for the polyamide resin, it is measured using a differential scanning calorimeter (DSC) in a nitrogen atmosphere at a heating rate of 10°C / min to 250°C, followed by immediate cooling to below room temperature, and then heating again from room temperature to 250°C at a heating rate of 10°C / min.

[0068] Polyamide resin (A) is preferably made from biomass raw materials (biomass polyamide resin). Using biomass polyamide resin reduces environmental impact. Polyamide resin (A) can also use monomer raw materials that have achieved Quality Balance Certification (ISCC PLUS). Quality Balance Certification is a system that quantifies and guarantees the extent to which renewable or bio-based raw materials are used, the extent of product production and shipment, and quality for each factory or production facility.

[0069] In addition, polyamide resin (A) may also be a reusable product (including recycled products, material reuse products, chemical reuse products, etc.), a defective product, or scrap material generated during the molding of polyamide resin (A) and the resin composition of this embodiment.

[0070] 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 in 100% by mass of the resin composition. By reaching the lower limit value or above, 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 in 100% by mass of the resin composition. By reaching the upper limit value or less, the transparency of the obtained film tends to be further improved.

[0071] The resin composition of this embodiment may contain only one type of polyamide resin (A), or it may contain two or more types. When it contains two or more types, the total amount is preferably within the range described above.

[0072] The resin composition of this embodiment may contain polyamide resin other than polyamide resin (A), or it may not contain polyamide resin.

[0073] Examples of polyamide resins other than polyamide resin (A) include aliphatic polyamide resins and aromatic polyamide resins.

[0074] 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.

[0075] 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 diphenylamine polyamide resins (MXD6, etc.).

[0076] Aliphatic polyamide resins and aromatic polyamide resins other than polyamide resin (A) are also preferred, as are polyamide resins (biomass thermoplastic resins) made from recycled resins and biomass raw materials.

[0077] Furthermore, the resin composition of this embodiment preferably does not substantially contain polyamide resin other than polyamide resin (A). Specifically, the content of polyamide resin other than polyamide resin (A) in the resin composition of this embodiment is preferably less than 10% by mass in 100% by mass of the resin composition, 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.

[0078] <Polyetheramide elastomer> The resin composition of this embodiment contains a polyetheramide elastomer. By using the polyetheramide elastomer in combination with a release agent, contamination of the first roller or a sharkskin-like film surface can be effectively suppressed during film manufacturing. Furthermore, haze can also be reduced.

[0079] Polyether amide elastomers are elastomers comprising both polyether and polyamide structures. The polyether amide elastomer in this embodiment is substantially free of ester structures. "Substantially free of ester structures" means it is not a so-called polyester ether amide elastomer; more specifically, the ester structure content is typically less than 1% by mass of the polyether amide 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.

[0080] The polyetheramide elastomer used in this embodiment preferably comprises polyalkylene glycol blocks and polyamide blocks.

[0081] The polyalkylene glycol block is preferably composed of -(alkylene-O). n2 - indicates. The above-mentioned -(alkylene-O) n2 The alkylene group in - is preferably a straight-chain or branched alkylene group with 1 to 10 carbon atoms. The number of carbon atoms constituting the above-mentioned alkylene group is preferably 2 or more, more preferably 3 or more, and preferably 8 or less, more preferably 6 or less, further preferably 5 or less, and even more preferably 5 or less. Specific examples of the above-mentioned -(alkylene-O)- can be -(CH2O)-, -(CH2CH2O)-, -(CH2CH2CH2O)-, -(CH(CH3)CH2O)-, -(CH2CH2CH2CH2O)-, -(C(CH3)2CH2O)-, or combinations of two or more of them.

[0082] The above-mentioned -(alkylene-O) n2 In the given information, n2 is preferably 1 to 200, and more preferably 3 to 100.

[0083] The polyalkylene glycol block preferably comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block.

[0084] In this embodiment, the proportion of polyalkylene glycol in the polyetheramide elastomer used in relation to 100 mol% of the total structural units of the polyetheramide elastomer is preferably 5 mol% or more, more preferably 10 mol% or more, even more preferably 15 mol% or more, even more preferably 20 mol% or more, and can 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 reaching the lower limit or above, the impact strength improvement effect is tended to be further enhanced when added to the polyamide resin (A). Furthermore, in this embodiment, the proportion of polyalkylene glycol in the polyetheramide elastomer used in relation to 100 mol% of the total structural units of the polyetheramide elastomer 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. By reaching the upper limit or below, there is a tendency for easy compatibility with the polyamide resin (A) (preferably an amorphous polyamide resin).

[0085] Polyetheramide elastomers may contain only one type of polyalkylene glycol or two or more types. When containing two or more types, the total amount is preferably within the range described above.

[0086] The polyamide block is preferably represented by an aliphatic polyamide block, and more preferably -(NH(CH2)). n3 C (=O) n4 - The aliphatic polyamide block shown. Wherein, n3 is preferably 3 or more, more preferably 5 or more, further preferably 7 or more, further preferably 9 or more, even more preferably 10 or more, and preferably 20 or less, more preferably 18 or less, further preferably 16 or less, even more preferably 14 or less, and even more preferably 12 or less.

[0087] Furthermore, regarding the aforementioned n3, when the number of carbon atoms in the aliphatic dicarboxylic acid constituting the polyamide resin (A) with 7 to 20 carbon atoms is set to n5 (for example, n5 = 10 in the case of sebacic acid), it is preferable that the difference (absolute value) between the values ​​of n5 and n3 is small. More specifically, |n5-n3| is preferably 3 or less, and more preferably 2 or less.

[0088] n4 is preferably 1 to 300, and more preferably 5 to 100.

[0089] In this embodiment, the proportion of polyamide in the polyether amide elastomer used 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, relative to 100 mol% of the total structural units of the polyether amide elastomer. By reaching the lower limit or above, the improvement in compatibility with the polyamide resin (A) (preferably an amorphous polyamide resin) tends to be further enhanced. Furthermore, in this embodiment, the proportion of polyamide in the polyether amide elastomer used 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, depending on the application, etc., it can be 70 mol% or less, 60 mol% or less, 50 mol% or less, 40 mol% or less, or 35 mol% or less. By reaching the upper limit or below, the effect of suppressing the glass transition temperature when added to the polyamide resin (A) tends to be further enhanced.

[0090] Polyetheramide elastomers may contain only one type of polyamide or two or more types. When containing two or more types, the total amount is preferably within the range described above.

[0091] In this embodiment, the weight-average molecular weight of the polyetheramide elastomer 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 reaching the lower limit or above, the toughness when mixed with polyamide resin (A) tends to improve. By reaching the upper limit or below, the compatibility with polyamide resin (A) tends to be further improved.

[0092] The weight-average molecular weight is the converted value of acrylic acid obtained by GPC (gel permeation chromatography).

[0093] In this embodiment, the total amount of polyalkylene glycol blocks and polyamide blocks in the polyetheramide elastomer is preferably 90% or more by mass, more preferably 95% or more by mass, even more preferably 97% or more by mass, and preferably 100% or less by mass.

[0094] Regarding the content of polyetheramide elastomer in the resin composition of this embodiment, relative to 100% by mass of the resin composition, it is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, further preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more. From the viewpoint of more effectively suppressing contamination of the first roller and preventing the film surface from becoming sharkskin-like, it is even more preferably 2.0% by mass or more, and even more preferably 3.0% by mass or more. Furthermore, regarding the content of polyetheramide elastomer in the resin composition of this embodiment, relative to 100% by mass of the resin composition, it is preferably 20.0% by mass or less, more preferably 15.0% by mass or less, further preferably 10.0% by mass or less, even more preferably 8.0% by mass or less, even more preferably 7.0% by mass or less, and even more preferably 5.0% by mass or less. From the viewpoint of further improving transparency, it is even more preferably 4.5% by mass or less.

[0095] The resin composition of this embodiment may contain only one type of polyetheramide elastomer, or it may contain two or more types. When it contains two or more types, the total amount is preferably within the range described above.

[0096] <Mold Release Agent> The resin composition of this embodiment contains a mold release agent. By combining the mold release agent with a polyetheramide elastomer, contamination of the first roller and a sharkskin-like film surface can be effectively suppressed during film manufacturing. Furthermore, haze can also be reduced.

[0097] In this embodiment, the release agent used is not particularly limited as long as it can improve the release properties with metal. For example, a compound with low reactivity with metal can be used.

[0098] Specifically, it preferably contains at least one selected from fatty acid esters, fatty amides, and polyalkylene glycols. By using such a compound, the peelability between the roller surface or the inner surface of the die and the film material is improved, effectively suppressing contamination of the first roller and the formation of a sharkskin-like film surface during film manufacturing, thereby effectively suppressing the tendency for mold fouling to occur on the die lip.

[0099] Fatty acid esters are typically composed of fatty acids and alcohols. Additionally, fatty amides are, for example, composed of fatty acids, ammonia, and / or amines, or obtained through the ammoniac decomposition of fatty acid esters. Furthermore, polyalkylene glycols are manufactured, for example, through the ring-opening polymerization of epoxides such as propylene oxide.

[0100] In this embodiment, when at least one of fatty acid esters, fatty amides and polyalkylene glycols is used, it is of course not limited to these compounds.

[0101] In this embodiment, the number of carbon atoms in the fatty acids constituting these fatty acid esters or fatty amides is preferably 7 or more, more preferably 8 or more, further preferably 9 or more, further preferably 10 or more, even more preferably 11 or more, and preferably 30 or less, more preferably 28 or less, further preferably 26 or less, even more preferably 24 or less, even more preferably 22 or less, and even more preferably 20 or less. By reaching the lower limit value or above, the release agent tends to seep to the resin surface during molding, and contamination of the first roller tends to be further suppressed. In addition, by reaching the upper limit value or below, the compatibility with polyamide resin (A) is improved, and the tendency of the release agent itself to become contaminant of the first roller can be effectively suppressed.

[0102] The fatty acid can be a straight-chain fatty acid, a branched-chain fatty acid, or a fatty acid with an alicyclic structure, preferably a straight-chain fatty acid and / or a branched-chain fatty acid. Furthermore, the fatty acid can be a saturated fatty acid or an unsaturated fatty acid. Additionally, the fatty acid can also be a hydroxycarboxylic acid.

[0103] In addition, the number of carboxyl groups (-COOH) contained in one molecule of fatty acid is preferably 1 to 10, more preferably 1 to 4.

[0104] Here, the details of fatty acid esters are explained. The number of ester bonds (-C(=O)O-) in one molecule of fatty acid ester is preferably 1 to 10, more preferably 1 to 4. The fatty acid ester used in this embodiment is preferably a complete ester (a fatty acid ester that does not contain unesterified COOH).

[0105] Furthermore, the alcohol constituting the fatty acid ester is preferably an aliphatic alcohol. The aliphatic alcohol can be a straight-chain aliphatic alcohol, a branched-chain aliphatic alcohol, or an alicyclic aliphatic alcohol, with straight-chain aliphatic alcohols and / or branched-chain aliphatic alcohols being preferred. Additionally, the aliphatic alcohol can be a saturated aliphatic alcohol or an unsaturated aliphatic alcohol, with saturated aliphatic alcohols being preferred.

[0106] In addition, aliphatic alcohols are preferably 1-10 alcohols, and more preferably 1-4 alcohols.

[0107] The aliphatic alcohol preferably has 1 or more carbon atoms, more preferably 2 or more, even more preferably 3 or more, and 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.

[0108] In this embodiment, the aliphatic ester is preferably at least one of a monoester, diester, triester, or tetraester composed of a fatty acid having 7 to 30 carbon atoms and a 1 to 4 boron alcohol. Furthermore, the fatty acid ester is preferably a full ester.

[0109] The molecular weight of the fatty acid ester is preferably 100 or more, and more preferably 2000 or less.

[0110] In this embodiment, when fatty acid esters are used, as specific examples, in addition to the fatty acid esters exemplified in the examples described later, 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, benzyl benzyl acid, and lignite wax may also be used.

[0111] Next, the details of fatty amides will be explained. The number of amide bonds (-C(=O)NH-) in one molecule of fatty amide is preferably 1 to 10, more preferably 1 to 4.

[0112] Furthermore, the fatty amide is preferably composed of fatty acids and amines. The amine constituting the fatty amide is preferably an aliphatic amine. The aliphatic amine can be a straight-chain aliphatic amine, a branched-chain aliphatic amine, or an aliphatic amine with an alicyclic structure, but straight-chain aliphatic amines and / or branched-chain aliphatic amines are preferred. Additionally, the aliphatic amine can be a saturated aliphatic amine or an unsaturated aliphatic amine, but saturated aliphatic amines are preferred.

[0113] In addition, aliphatic amines preferably have 1 to 10 amino groups in one molecule, and more preferably 1 to 4 amino groups.

[0114] In this embodiment, the aliphatic amide is preferably at least one of a monoamide, diamide, triamide, or tetraamide, which is composed of a fatty acid having 7 to 30 carbon atoms and an amine having 1 to 4 amino groups in one molecule. Furthermore, the aliphatic amide is preferably aliphatic amide that does not have an amino group (-NH2).

[0115] The molecular weight of the fatty amide is preferably 100 or more, and more preferably 1000 or less.

[0116] In this embodiment, when using fatty amides, as specific examples, in addition to the fatty amides exemplified in the examples described later, stearamide, oleamide, erucamide, benzyl amide, palmitamide, ethylene dioleamide, and ethylene dierucamide may also be used.

[0117] Next, the details of the polyalkylene glycol will be described. Preferably, the polyalkylene glycol comprises ethylene glycol units and / or propylene glycol units in a total proportion of at least 50 mol% of all units, and has a number average molecular weight of 100 to 3500.

[0118] In this embodiment, the polyalkylene glycol preferably comprises 50 mol% or more of ethylene glycol units and / or propylene glycol units, more preferably 60 mol% or more, further preferably 70 mol% or more, further preferably 80 mol% or more, even more preferably 90 mol% or more, even more preferably 95 mol% or more, and particularly preferably 99 mol% or more. Alternatively, all units other than the end groups may be ethylene glycol units and / or propylene glycol units. By achieving the above-mentioned lower limit values, the lubricity between the polyalkylene glycol and the inner wall of the molding machine is improved during molding due to the polyalkylene glycol seeping to the resin surface. Therefore, the retention of the resin composition can be suppressed, thereby further suppressing the contamination of the first roller and the tendency for the film surface to become sharkskin-like. In addition, by making the ethylene glycol units and / or propylene glycol units comprise 50 mol% or more of the total units, it is easier to achieve appropriate compatibility with the polyamide resin (A). During molding, excessive seepage of polyalkylene glycol to the film surface can be suppressed, and there is a tendency to effectively suppress the contamination of the first roller caused by the polyalkylene glycol itself.

[0119] In this embodiment, the polyalkylene glycol may include other monomer units in addition to ethylene glycol and propylene glycol units. Preferably, the other monomer units are alkylene glycol units other than ethylene glycol and propylene glycol units.

[0120] Other alkylene glycol units can be exemplified by methylene glycol, butanediol, pentanediol, hexanediol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, neopentanediol, 3-methyltetramethylene glycol, hexamethylene glycol, etc.

[0121] In this embodiment, the ends of the polyalkylene glycol can be modified with any substituents.

[0122] In addition, end modification can be done on one end of the polyalkylene glycol or on both ends.

[0123] As any substituent, examples include carboxyl, hydroxyl, alkyl ether, aryl ether, aralkyl ether, fatty acid ester, and aryl ester.

[0124] In this embodiment, the number-average molecular weight of the polyalkylene glycol is preferably 100 to 3500, more preferably 300 or more, further preferably 500 or more, more preferably 800 or more, and even more preferably 1000 or more. The upper limit is more preferably 3000 or less, more preferably 2000 or less, and even more preferably 1500 or less. By reaching the lower limit or above, the volatilization of the polyalkylene glycol tends to be effectively suppressed. Furthermore, by reaching the upper limit or below, the decrease in transparency tends to be more effectively suppressed. This is presumably because the polyalkylene glycol is completely compatible with the polyamide resin (A), thus forming an island structure. When the number-average molecular weight of the polyalkylene glycol is high, the island portion expands, the refractive index difference increases, and thus transparency decreases.

[0125] Number-average molecular weight can be determined according to JIS K1577.

[0126] In this embodiment, when polyalkylene glycols are used, examples include polyethylene glycol, polypropylene glycol, or copolymers containing ethylene glycol units and / or propylene glycol units and other alkylene glycol units. Polyethylene glycol or propylene glycol is preferred, and polypropylene glycol is more preferred from the viewpoint of ease of manufacture.

[0127] In this embodiment, the polyalkylene glycol is not particularly limited and can be manufactured using known methods or commercially available products can be used. Examples of commercially available products include D-1000 (manufactured by Nippon Yuko Co., Ltd.), D-2000 (manufactured by Nippon Yuko Co., Ltd.), and D-4000 (manufactured by Nippon Yuko Co., Ltd.).

[0128] 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, even more preferably 0.3% by mass or more, and 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 reaching the lower limit value or above, there is a tendency to effectively suppress contamination of the first roller and the formation of a sharkskin-like film surface during molding. In addition, by reaching the upper limit value or below, there is a tendency to more effectively suppress the decrease in transparency, glass transition temperature, and toughness. The resin composition of this embodiment may contain only one type of release agent or may contain two or more types. When containing two or more types, the total amount is preferably within the above range.

[0129] Regarding the resin composition of this embodiment, it is preferable that the content of polyamide resin (A) in the resin composition is 80.0 to 99.9% by mass, the content of polyetheramide elastomer is 20.0 to 0.1% by mass, and the content of mold release agent is 0.001 to 10% by mass. By setting the content of polyetheramide elastomer and mold release agent to the above-mentioned upper limit values ​​or below, there is a tendency to synergistically improve transparency.

[0130] In addition, the total amount of polyamide resin (A), polyetheramide elastomer and release agent shall not exceed 100% by mass.

[0131] Regarding the resin composition of this embodiment, the total amount of polyamide resin (A), polyetheramide elastomer, and release agent in 100% by mass of the resin composition is preferably 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, even more preferably 99% by mass or more, and preferably 100% by mass or less.

[0132] <Other Ingredients> The resin composition of this embodiment may contain other components besides polyamide resin (A), polyetheramide elastomer, and release agent, or it may not contain any of them.

[0133] Other components may include ultraviolet absorbers, antioxidants, heat stabilizers, flame retardants, flame retardant additives, colorants, antistatic agents, fluorescent whitening agents, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, slip improvers, hue improvers, acid traps, etc.

[0134] Furthermore, the resin composition of this embodiment may be combined with additives described in paragraphs 0047 to 0103 of International Publication No. 2021 / 241471, additives described in paragraphs 0041 to 0056 of Japanese Patent Application Publication No. 2023-61203, and additives described in paragraphs 0017 to 0021 of International Publication No. 2024 / 029515, and these contents are incorporated into this specification.

[0135] When other components are present, their total content is preferably 0.001 to 3% by mass of the resin composition, more preferably less than 2% by mass, even more preferably less than 1% by mass, even more preferably less than 0.5% by mass, even more preferably less than 0.1% by mass, and may also be less than 0.01% by mass.

[0136] Other ingredients may be one type or two or more types. When two or more other ingredients are present, the preferred total amount is within the range described above.

[0137] <Physical Properties of Resin Compositions> The resin composition of this embodiment preferably has excellent transparency.

[0138] Specifically, the total light transmittance of the resin composition of this embodiment when molded into a film with a thickness of 300 μm 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 even 99% or less is sufficient to meet the required performance.

[0139] Furthermore, when the resin composition of this embodiment is molded into a film with a thickness of 300 μm, 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 even if it is 0.001% or more, the required performance is satisfied.

[0140] Total light transmittance and haze can be measured according to the embodiments described later.

[0141] <Method for manufacturing resin composition> Any method can be used as the method for manufacturing the resin composition of this embodiment.

[0142] For example, it can be obtained by melt-kneading a mixture of polyamide resin (A), polyetheramide elastomer, and mold release agent. More specifically, the following methods can be used: using a mixing method such as a V-type mixer, the polyamide resin (A), polyetheramide elastomer, mold release agent, and other components to be added as needed are mixed to prepare a disposable mixture, which is then melt-kneaded and granulated using an extruder with vents.

[0143] <Membrane> The membrane in this embodiment is formed from the resin composition of this embodiment.

[0144] The thickness of the membrane in this embodiment is preferably 10 μm or more, more preferably 50 μm or more, even more preferably 100 μm or more, and 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.

[0145] The membrane in this embodiment preferably has excellent transparency.

[0146] Specifically, the total light transmittance of the membrane in this embodiment 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 of the above-mentioned membrane is preferably 100%, but even 99% or less is sufficient to meet the required performance.

[0147] Furthermore, the haze of the membrane in this embodiment is preferably 3.0% or less, more preferably 2.0% or less, even more preferably 1.5% or less, even more preferably 1.0% or less, 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 above-mentioned membrane is preferably 0%, but even if it is 0.001% or more, the required performance is satisfied.

[0148] Total light transmittance and haze were measured according to the embodiments described later.

[0149] <Wound Body> The membrane of this embodiment can be made into a wound body that is wound on a core material.

[0150] <Polarizer> The film formed from the resin composition of this embodiment or the film of this embodiment is preferably used as a protective film for polarizers (a film that protects polarizers).

[0151] In this embodiment, the polarizer is preferably a sheet comprising the film of this embodiment and a polarizing film, and laminated in the order of polarizing film and protective film. That is, the film of this embodiment is preferably used as at least one protective film of the polarizer. The protective film is usually bonded to the polarizing film using an adhesive. In this embodiment, one protective film of the polarizer can be the film of this embodiment or another protective film. When one protective film of the polarizer is the film of this embodiment, the other protective film of the polarizer can be a known protective film of polarizer or the film of this embodiment. The polarizing film can be a known polarizing film, and an example is a polarizing film formed by adsorbing or impregnating a polyvinyl alcohol (PVA) film with iodine or a dichroic organic dye.

[0152] The adhesive used to bond the film, other protective films, and polarizing film in this embodiment can be any known adhesive, such as acrylic adhesives, polyurethane adhesives, epoxy adhesives, silicone adhesives, and polyvinyl alcohol adhesives. Among these, polyurethane adhesives are preferred.

[0153] The thickness of the adhesive is typically greater than 1 μm and typically less than 30 μm.

[0154] In addition, the polarizer of this embodiment may also have a masking film or the like provided on the outside of the film or other protective films of this embodiment.

[0155] Furthermore, in this embodiment, the polarizer is preferably used for hot-bent molded products obtained by hot bending processing.

[0156] When the film of this embodiment is used in a polarizer or a thermoformed body, the film of this embodiment can be disposed on either side of the polarizing film or on both sides.

[0157] The first method involves, after performing a hot bending process on the film of this embodiment, positioning it on the convex side of the polarizing film, for example, located on... Figure 2 The protective film is configured on all four sides.

[0158] The second method involves, after performing a thermal bending process on the film of this embodiment, positioning it on the concave side of the polarizing film, for example, located on... Figure 2 The protective film is configured on three sides.

[0159] The third approach is that the film in this embodiment is located on both sides of the polarizing film, for example... Figure 2 Both protective films 3 and 4 are films used in this embodiment.

[0160] Among them, Figure 2 In this embodiment, lens 1, polarizing film 2, and protective film 3 and 4 are bent, but polarizers that are not bent are also included.

[0161] The polarizer used in this embodiment, along with other protective films, may or may not be stretched. In the first embodiment, stretching is preferred. In the second embodiment, non-stretching is preferred. Furthermore, in the third embodiment, it is configured to be located at... Figure 2 The protective film on all four sides is preferably stretched and configured to be located on Figure 2 The protective film on the three sides is preferably not stretched.

[0162] In this embodiment, the polarizer is preferably used as a polarizer for liquid crystal display devices, polarized lenses (sunglasses, ski goggles, spectacle lenses, camera viewfinders), housings for various measuring instruments, automotive glass, tram glass, polarizers for vehicle display panels or electronic device housings, mirrors for vehicle rearview mirrors, helmets, etc., and is particularly preferred as a polarizer for sunglasses.

[0163] Example The present invention will be described in more detail below with examples. The materials, amounts, proportions, processing contents, processing order, etc., shown in the following examples can be appropriately changed without departing from the spirit of the invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0164] If the measuring equipment used in the embodiments is difficult to obtain due to obsolescence or other reasons, other equipment with equivalent performance can be used for measurement.

[0165] 1. Raw materials A1: XE4205, manufactured by EMS, is a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane and sebacic acid; it is an amorphous polyamide resin. A2: XE4805, manufactured by EMS, is a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane and sebacic acid; it is an amorphous polyamide resin. A3: G850, manufactured by Arkema, is a polyamide resin, an amorphous 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 monomers). B1: 9055X1, a polyetheramide elastomer composed of 42 mol% polyamide 12, 37 mol% PTMG, and 21 mol% PPO, manufactured by UBE Corporation. B2: 9048X1, a polyetheramide elastomer composed of 30 mol% polyamide 12, 43 mol% PTMG, and 27 mol% PPO, manufactured by UBE Corporation. C1: EB-P, manufactured by Kao Corporation, fatty amide C2: H-476, manufactured by Nichiyu Corporation, fatty acid ester C3: D-1000, manufactured by Nippon Oil Co., Ltd., polypropylene glycol, number average molecular weight: 1000 2. Examples 1-5, Comparative Examples 1-3 <Manufacturing of Resin Granules> The components were mixed in the manner shown in Table 1 below (the content in Table 1 is expressed in parts by mass) using a rotary drum. The mixture was fed from the root of a twin-screw extruder (manufactured by Nippon Steel, TEX30α) and melt-blended at a barrel temperature of 280°C to produce the pellets of the Examples and Comparative Examples.

[0166] <Membrane Manufacturing> A T-die melt extruder, consisting of a vented single-screw extruder (manufactured by Shibaura Machinery Co., Ltd.) with a nominal screw diameter of 50 mm and a screw L / D ratio of 31.6, was used to extrude the obtained granules into a molten state at a screw speed of 115 rpm. The molten granules were then pressed together using the first and second rollers and allowed to cool and solidify to produce a film. The process was carried out at a barrel temperature of 280°C, a die temperature of 300°C, and a roller temperature of 120°C. A film with a thickness of 300 μm was obtained.

[0167] The details of the first and second rollers used are described below.

[0168] • First roller: Manufactured by Shibaura Machinery Co., Ltd., UM roller Dimensions: Outer diameter 300mm × Roll width 600mm • Second roller: Manufactured by Shibaura Machinery Co., Ltd., metal rigid roller (surface: chrome treated). Dimensions: Outer diameter 300mm × Roll width 600mm <Roller contamination> The first and second rolls, after consuming 350 kg of polyamide resin raw material for membrane manufacturing, were evaluated visually as follows. The evaluation was conducted by five experts, with judgment made by majority vote. In the table below, the evaluation results for the first roll are recorded in the "No. 1R Roll Contamination" column, and the evaluation results for the second roll are recorded in the "No. 2R Roll Contamination" column.

[0169] A: No roller contamination was observed, or only a small amount of roller contamination was observed, but it was at a usable level.

[0170] B: Roller contamination has occurred; this is not up to practical standards.

[0171] <Poor appearance of sharkskin> For the film that has been in use for 7 hours after paper delivery, it was evaluated visually as follows. The evaluation was conducted by 5 experts, and the judgment was made by majority vote.

[0172] A: No sharkskin-like membrane surface was observed, or only a small amount of sharkskin-like membrane surface was observed, but it was at a usable level.

[0173] B: A sharkskin-like membrane surface was produced, which is beyond the practical level.

[0174] <Poor appearance of mold deposits> For the film that has been in use for 7 hours after paper delivery, it was evaluated visually as follows. The evaluation was conducted by 5 experts, and the judgment was made by majority vote.

[0175] A: No fouling was observed on the membrane surface, or only a small amount of fouling was observed, but it was at a usable level.

[0176] B: Debris has formed on the membrane surface, which is beyond the practical level.

[0177] <Determination of Haze and Total Light Transmittance> Using a haze meter, under the conditions of a D65 light source and a 10° field of view, the haze (%) and total light transmittance (%) of the 300 μm thick film obtained above were measured.

[0178] The haze meter used is the "HM-150" manufactured by Murakami Color Technology Research Institute Co., Ltd.

[0179] [Table 1] According to the results in Table 1, in this invention, a membrane that effectively suppresses contamination of the first roller and forms a sharkskin-like surface was obtained.

[0180] 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 roller or a sharkskin-like appearance of the film surface occurred during film manufacturing.

[0181] Symbol Explanation 1: Lens; 2: Polarizing film; 3: Protective film; 4: Protective film; 10: Raw material; 11: Die; 12: First roller; 13: Second roller; 14: Third roller; 15: Contamination.

Claims

1. A resin composition, characterized in that: It contains polyamide resin, polyetheramide elastomer, and mold release agent. The polyamide resin comprises alicyclic diamine units and aliphatic dicarboxylic acid units with 7 to 20 carbon atoms.

2. The resin composition according to claim 1, characterized in that: The aliphatic dicarboxylic acid units with 7 to 20 carbon atoms include sebacic acid units and / or dodecanoic acid units.

3. The resin composition according to claim 1 or 2, characterized in that: The alicyclic diamine constituting the alicyclic diamine unit comprises two substituted or unsubstituted cyclohexane rings.

4. The resin composition according to any one of claims 1 to 3, characterized in that: The alicyclic diamine unit includes the unit shown in formula (PA-1). In formula (PA-1), R 1 Each is an alkyl group having 1 to 5 carbon atoms, and n1 is an integer from 0 to 3. * indicates the bonding site with other units or terminal groups.

5. The resin composition according to any one of claims 1 to 4, characterized in that: The polyetheramide elastomer comprises polyalkylene glycol blocks and polyamide blocks.

6. The resin composition according to claim 5, characterized in that: 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, characterized in that: The polyamide resin in the resin composition is 80.0-99.9% by mass, the polyetheramide elastomer is 20.0-0.1% by mass, and the release agent is 0.001-10% by mass, wherein the total amount of polyamide resin, polyetheramide elastomer and release agent is not greater than 100% by mass.

8. The resin composition according to any one of claims 1 to 7, characterized in that: The release agent comprises at least one selected from fatty acid esters, fatty amides, and polyalkylene glycols.

9. The resin composition according to any one of claims 1 to 8, characterized in that: The polyamide resin is an amorphous resin.

10. The resin composition according to any one of claims 1 to 9, characterized in that: The haze of the resin composition when molded into a film with a thickness of 300 μm is less than 3.0%.

11. The resin composition according to any one of claims 1 to 10, characterized in that: When the resin composition is molded into a film with a thickness of 300 μm, the total light transmittance is 80% or more.

12. The resin composition according to any one of claims 1 to 11, characterized in that: It is used as a protective film for polarizers.

13. The resin composition according to any one of claims 1 to 12, characterized in that: The aliphatic dicarboxylic acid units with 7 to 20 carbon atoms include sebacic acid units and / or dodecanoic acid units. The alicyclic diamine unit includes the unit shown in formula (PA-1). The polyetheramide elastomer comprises polyalkylene glycol blocks and polyamide blocks. The polyalkylene glycol block comprises a polypropylene glycol (PPG) block and / or a polytetramethylene ether glycol (PTMG) block. The polyamide resin in the resin composition comprises 80.0–99.9% by mass, the polyetheramide elastomer comprises 20.0–0.1% by mass, and the release agent comprises 0.001–10% by mass, wherein the total content of the polyamide resin, polyetheramide elastomer, and release agent is not greater than 100% by mass. The release agent comprises at least one selected from fatty acid esters, fatty amides, and polyalkylene glycols. The polyamide resin is an amorphous resin. When the resin composition is molded into a film with a thickness of 300 μm, the haze is less than 3.0%. When the resin composition is molded into a film with a thickness of 300 μm, the total light transmittance is above 80%. The resin composition is used as a protective film for polarizers. In formula (PA-1), R 1 Each is an alkyl group having 1 to 5 carbon atoms, and n1 is an integer from 0 to 3. * indicates the bonding site with other units or terminal groups.

14. A membrane, characterized in that: Formed from the resin composition according to any one of claims 1 to 13.

15. A polarizer, characterized in that: It includes the film and polarizing film as described in claim 14.

16. A type of sunglasses, characterized in that: It includes the polarizer as described in claim 15.

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