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 containing an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms; and a release agent containing a fatty acid ester and / or a fatty acid amide, the fatty acid constituting the fatty acid ester and / or the fatty acid amide being a fatty acid having 7 to 30 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 have been 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 are used in many fields, but they are usually resins with poor transparency and have never been used for applications that require transparency.

[0005] In this context, the inventors of this invention are researching the application of polyamide resin to transparent applications such as protective films for polarizing films. However, when molding polyamide resin into a film, contamination sometimes occurs on the rollers during film manufacturing.

[0006] The purpose of this invention is to solve the technical problem of providing a resin composition, film, polarizer, and sunglasses that can provide excellent transparency and effectively suppress roller contamination during film manufacturing.

[0007] Technical solutions for solving technical problems After conducting research based on the above-mentioned technical problems, the inventors of this invention discovered that by incorporating an ester or amide of a fatty acid with 7 to 30 carbon atoms into a specified polyamide resin as a release agent, the above-mentioned technical problems can be solved.

[0008] Specifically, the aforementioned technical problems can be solved by the following solutions.

[0009] <1> A resin composition comprising: a polyamide resin containing alicyclic diamine units and aliphatic dicarboxylic acid units having 7 to 20 carbon atoms; and a mold release agent. The above-mentioned release agents contain fatty acid esters and / or fatty acid amides. The fatty acids that constitute the above-mentioned fatty acid esters and / or fatty acid amides are fatty acids with 7 to 30 carbon atoms.

[0010] <2> like <1> The resin composition wherein the content of the polyamide resin contained in the resin composition is 90% by mass or more.

[0011] <3> like <1> or <2> The resin composition wherein the aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms comprises sebacic acid unit and / or dodecanoic acid unit.

[0012] <4> like <1> ~ <3> The resin composition of any one of the above-mentioned alicyclic diamine units comprises two substituted or unsubstituted cyclohexane rings.

[0013] <5> like <1> or <2> The resin composition wherein the alicyclic diamine unit comprises a unit represented by 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. * represents the bonding site where it is bonded to other units or terminal groups.

[0014] <6> like <1> ~ <5> The resin composition according to any one of the following methods, wherein the content of the release agent contained in the resin composition is 0.001 to 10 by mass.

[0015] <7> like <1> ~ <6> The resin composition described in any one of the above descriptions, 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 release agent contained in the above resin composition is 0.001 to 10% by mass. 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 a bonding site that is bonded to other units or terminal groups.

[0016] <8> like <1> ~ <7> The resin composition according to any one of the following methods, wherein the polyamide resin is an amorphous resin.

[0017] <9> like <1> ~ <8> The resin composition according to any one of the following methods, wherein the haze when the resin composition is molded into a film with a thickness of 300 μm is 3.0% or less.

[0018] <10> like <1> ~ <9> The resin composition according to any one of the following methods, 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] <11> like <1> ~ <10> The resin composition described in any one of the following statements, wherein the resin composition is used as a protective film for a polarizer.

[0020] <12> A kind of <1> ~ <11> The film formed by the resin composition described in any one of the above statements.

[0021] <13> A polarizer comprising <12> The aforementioned film and polarizing film.

[0022] <14> A type of sunglasses, comprising <13> The aforementioned polarizer.

[0023] Invention Effects The present invention provides resin compositions, films, polarizers, and sunglasses that provide excellent transparency and effectively suppress roll contamination during film manufacturing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating an example of the layer structure of a thermoformed body according to this embodiment. Detailed Implementation

[0025] The following describes specific embodiments of the present invention (hereinafter referred to as "this embodiment"). It should be noted that the following embodiments are merely illustrative examples of the present invention, and the present invention is not limited to these embodiments.

[0026] It should be noted that in this specification, "~" is used to indicate the lower and upper limits of the values ​​described before and after it. Furthermore, any combination of the upper and lower limits mentioned above is also considered an example of this embodiment.

[0027] Unless otherwise specified, all physical property values ​​and characteristic values ​​in this specification refer to values ​​at 23°C.

[0028] In the description of groups (atomic groups) in this specification, the expressions "unsubstituted" and "unsubstituted" include both groups (atomic groups) without substituents and groups (atomic groups) with substituents. For example, "alkyl" includes not only alkyl groups without substituents (unsubstituted alkyl) but also alkyl groups with substituents (substituted alkyl). In this specification, the expressions "unsubstituted" and "unsubstituted" are preferably unsubstituted.

[0029] In this specification, examples of substituents are preferably halogen atoms, cyano groups, nitro groups, hydroxyl groups, alkyl groups, alkoxy groups, aryl groups, aryloxy groups, heterocyclic groups, heterocyclic groups, alkenyl groups, alkylthio groups, arylthio groups, acyl groups, or amino groups; more preferably, halogen atoms, alkyl groups, alkoxy groups, aryl groups, aryloxy groups, alkenyl groups, or acyl groups; even more preferably, alkyl groups, aryl groups, aryloxy groups, or alkenyl groups; and even more preferably, alkyl groups. The formula weight of these substituents is preferably 15 or more, and more preferably 200 or less. Regarding the formula weight, for example, in the case of methyl (-CH3), it is 15. Although these substituents may also have substituents, it is preferable that they do not have substituents.

[0030] In this specification, "film" refers to a generally flat molded body that is relatively thin relative to its length and width, and also includes the meaning of sheet material. Furthermore, the term "film" in this specification can refer to a single layer or multiple layers, but is preferably a single layer.

[0031] Unless otherwise specified, the standard based on January 1, 2023 shall be used, where the measurement methods and other parameters described in this instruction manual vary from year to year.

[0032] Figure 1 The scale of the document is sometimes inconsistent with the actual scale.

[0033] <Resin Composition> The resin composition of this embodiment is characterized by containing: a polyamide resin comprising an alicyclic diamine unit and an aliphatic dicarboxylic acid unit having 7 to 20 carbon atoms; and a release agent comprising a fatty acid ester and / or a fatty acid amide, wherein the fatty acid constituting the fatty acid ester and / or fatty acid amide is a fatty acid having 7 to 30 carbon atoms.

[0034] By employing this configuration, a resin composition can be obtained that provides excellent transparency and effectively suppresses roller contamination during film manufacturing. The inventors deduced that roller contamination is caused, for example, by polyamide resin remaining in the mold during extrusion molding and adhering to the metal wall, leading to polyamide resin decomposition. Through research, the inventors recognized that by using a release agent containing ester and / or amide bonds and derived from fatty acids with 7 to 30 carbon atoms as a release agent, the retention of polyamide resin in the mold can be effectively suppressed, resulting in effective suppression of roller contamination. The inventors deduced that this is because the presence of ester and / or amide bonds enables moderate compatibility with polyamide resin, and because the release agent contains fatty acids with 7 to 30 carbon atoms, the aliphatic groups contained in the release agent are less likely to exist on the metal wall side within the mold in the resin composition. The inventors deduced that by using a release agent with these characteristics, a resin composition that provides a film that both maintains transparency and effectively suppresses roller contamination during film manufacturing can be obtained.

[0035] The details of this embodiment will be described below.

[0036] 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).

[0037] The alicyclic structure of polyamide resin (A) not only improves the transparency of the polyamide resin itself, but also improves the compatibility of aliphatic dicarboxylic acid units with 7 to 20 carbon atoms with the mold release agent, thereby improving the transparency of the resulting resin composition.

[0038] In this embodiment, the alicyclic diamine constituting the alicyclic diamine unit is preferably a diamine containing a five-membered ring and / or a six-membered ring. The five-membered and / or six-membered rings may or may not have substituents. Furthermore, the alicyclic diamine is preferably composed only of aliphatic hydrocarbon groups containing an alicyclic structure, except for the terminal amino group.

[0039] The aforementioned alicyclic diamine unit is more preferably characterized by having 2 to 3 or more substituted or unsubstituted cyclohexane rings in one unit, and more preferably by having two substituted or unsubstituted cyclohexane rings. The alicyclic diamine unit preferably does not contain carbon-carbon double bonds or carbon-carbon triple bonds.

[0040] 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.

[0041] In this embodiment, the alicyclic diamine unit is more preferably included in at least one of the formulas (PA-0). In formula (PA-0), R is an independent substituent, n is an independent integer from 0 to 5; L is a single bond or a divalent linker; * indicates a bonding site that is bonded to other units or terminal groups.

[0042] In formula (PA-0), R is an independent substituent, preferably an aliphatic group with 1 to 6 carbon atoms, more preferably an alkyl group with 1 to 6 carbon atoms, further 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.

[0043] In formula (PA-0), n is independently 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.

[0044] In formula (PA-0), L is a single bond or a divalent linker, 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, further preferably a single bond, methylene, ethylene or isopropylene, and even more preferably methylene.

[0045] * indicates a bonding site that is bonded to other units or terminal groups. That is, it usually forms an amide bond with -C(=O)- and together with NH in formula (PA-0), or forms a terminal amino group with a hydrogen atom and together with NH in formula (PA-0), or is bonded to a terminal group.

[0046] In this embodiment, the alicyclic diamine unit is more preferably the unit represented by 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 a bonding site that is bonded to other units or terminal groups.

[0047] In equation (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.

[0048] 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 more preferably 1.

[0049] 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, etc.

[0050] The polyamide resin (A) preferably contains at least 75 mol% of diamine units, more preferably at least 80 mol%, further preferably at least 85 mol%, even more preferably at least 90 mol%, even more preferably at least 95 mol%, particularly preferably at least 99 mol%, and at least 100 mol% or less. The alicyclic diamine units can be one type or a combination of two or more types.

[0051] Examples of alicyclic diamines, other than tetramethylenediamines, that can be used as raw material diamine components in polyamide resin (A) include tetramethylenediamine, pentamethylenediamine, 2-methylpentanediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, dodecamethylenediamine, 2,2,4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, etc.; and diamines with aromatic rings such as phenylenedimethyldiamine, bis(4-aminophenyl) ether, p-phenylenediamine, bis(aminomethyl)naphthalene, etc. One or more of these can be used.

[0052] 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 number of carbon atoms constituting the above-mentioned straight-chain aliphatic dicarboxylic acid with 7 to 20 carbon atoms is preferably 8 or more, 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 this. Where n is an integer from 5 to 18.

[0053] As an aliphatic dicarboxylic acid unit with 7 to 20 carbon atoms that can be used in this embodiment, it preferably includes at least one of sebacic acid unit, undecanoic acid unit and dodecanoic acid unit, and more preferably includes sebacic acid unit and / or dodecanoic acid unit.

[0054] The polyamide resin (A) preferably contains at least 75 mol% of aliphatic dicarboxylic acid units with 7 to 20 carbon atoms, more preferably at least 80 mol%, further preferably at least 85 mol%, even more preferably at least 90 mol%, even more preferably at least 95 mol%, particularly preferably at least 99 mol%, and at least 100 mol% of the dicarboxylic acid units constituting the polyamide resin. The aliphatic dicarboxylic acid units with 7 to 20 carbon atoms can be one type or a combination of two or more types.

[0055] Examples of dicarboxylic acid components other than aliphatic dicarboxylic acids with 7 to 20 carbon atoms include phthalic acid compounds such as isophthalic acid, terephthalic acid, and phthalic acid, as well as isomers of naphthalic acid such as 1,2-naphthalic acid, 1,3-naphthalic acid, 1,4-naphthalic acid, 1,5-naphthalic acid, 1,6-naphthalic acid, 1,7-naphthalic acid, 1,8-naphthalic acid, 2,3-naphthalic acid, 2,6-naphthalic acid, and 2,7-naphthalic acid. One or more of these can be used in combination.

[0056] The polyamide resin (A) used in this embodiment may also contain aminocarboxylic acid units. By containing aminocarboxylic acid units, there is a tendency to improve the hue of the molded article.

[0057] The type of aminocarboxylic acid constituting the aminocarboxylic acid unit is not particularly limited, and known aminocarboxylic acids can be used. Preferably, the aminocarboxylic acid is composed only of aliphatic hydrocarbon groups, except for the terminal amino and carboxylic acid groups.

[0058] 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.

[0059] The aminocarboxylic acid constituting the aminocarboxylic acid unit is preferably represented by formula (PA-2). In equation (PA-2), n is an integer from 5 to 20.

[0060] 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.

[0061] It should be noted that the polyamide resin (A) contains diamine units and dicarboxylic acid units as main components, but does not completely exclude monomer units other than these two. Of course, it may also contain lactam units such as ε-caprolactam and laurolactam, and aliphatic aminocarboxylic acid units such as aminocaproic acid and aminoundecanoic acid. In particular, the polyamide resin (A) used in this embodiment preferably contains aminocarboxylic acid units.

[0062] In this embodiment, it is preferred that the total number of diamine units, dicarboxylic acid units, and aminocarboxylic acid units, which are included as needed, in the monomer units constituting polyamide resin (A) accounts for more than 90% by mass of all monomer units, more preferably more than 95% by mass, further preferably more than 97% by mass, and even more preferably more than 99% by mass.

[0063] 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.

[0064] In addition, in this embodiment, the proportion of aminocarboxylic acid units in all monomer units constituting polyamide resin (A) is preferably 1 mol% or more, more preferably 5 mol% or more, and preferably 50 mol% or less, more preferably 40 mol% or less.

[0065] 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 fusion enthalpy ΔHm of less than 5 J / g, preferably less than 3 J / g, and more preferably less than 1 J / g. The fusion enthalpy ΔHm is determined according to JIS K7121 and K7122 during the heating process. Specifically, it is determined using a differential scanning calorimeter (DSC) in a nitrogen atmosphere, by heating the polyamide resin from room temperature to 250°C at a heating rate of 10°C / min, immediately cooling it to below room temperature, and then heating it again from room temperature to 250°C at a heating rate of 10°C / min.

[0066] 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 quantifies the use of renewable or biomass raw materials, as well as the production and shipment of products, for each plant or production facility, and guarantees their quality.

[0067] In addition, polyamide resin (A) may also be a reusable product (including recycled products, material reuse products, chemical reuse products, etc.), a defective product, polyamide resin (A), and scrap generated during the molding process of the resin composition of this embodiment.

[0068] The content of polyamide resin (A) in the resin composition of this embodiment is preferably 90% by mass or more, more preferably 95% by mass or more, further preferably 97% by mass or more, even more preferably 98% by mass or more, and still more preferably 99% by mass or more. By setting it to the lower limit or above, there is a tendency to further increase the glass transition temperature. In addition, 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 setting it to the upper limit or less, there is a tendency to further improve the transparency of the obtained film. In addition, in the resin composition of this embodiment, all components except the release agent (B) can be polyamide resin (A).

[0069] The resin composition of this embodiment may contain only one type of polyamide resin (A), or it may contain two or more types. When two or more types are contained, the total amount is preferably within the above-mentioned range.

[0070] The resin composition of this embodiment may contain polyamide resin other than polyamide resin (A), or it may not contain polyamide resin other than polyamide resin (A).

[0071] As polyamide resins other than polyamide resin (A), examples include aliphatic polyamide resins and aromatic polyamide resins other than polyamide resin (A).

[0072] 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.

[0073] Examples of aromatic polyamide resins include poly(hexamethylene terephthalamide) (polyamide 6T), poly(hexamethylene isophthalamide) (polyamide 6I), polyamide 66 / 6T, polyamide 9T, polyamide 9MT, polyamide 10T, polyamide 6I / 6T, and diphenylene diamine-based polyamide resins (MXD6, etc.).

[0074] In addition to aliphatic polyamide resins (A) and aromatic polyamide resins, polyamide resins (biomass thermoplastic resins) made from recycled resins or biomass raw materials are preferred.

[0075] Furthermore, the resin composition of this embodiment preferably does not 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.

[0076] <Mold Release Agent> The resin composition of this embodiment contains a release agent (hereinafter referred to as "release agent (B)") comprising fatty acid esters and / or fatty acid amides, wherein the fatty acids constituting the fatty acid esters and / or fatty acid amides are fatty acids having 7 to 30 carbon atoms. By using this release agent in combination with the polyamide resin (A) described above, a resin composition that provides excellent transparency and effectively suppresses roller contamination during film manufacturing can be obtained.

[0077] Fatty acid esters are typically formed from fatty acids and alcohols. Alternatively, fatty acid amides can be formed, for example, from fatty acids with ammonia and / or amines, or obtained through the ammoniac decomposition of fatty acid esters.

[0078] The fatty acid esters and / or fatty acid amides used in this embodiment are, of course, not limited to these.

[0079] In this embodiment, the fatty acids constituting these fatty acid esters or fatty acid amides have 7 or more carbon atoms, preferably 8 or more, more preferably 9 or more, further preferably 10 or more, and even more preferably 11 or more, and 30 or less, preferably 28 or less, more preferably 26 or less, further preferably 24 or less, even more preferably 22 or less, and still more preferably 20 or less. By setting the value to the lower limit or above, the release agent tends to easily seep to the resin surface during molding, resulting in a greater tendency to improve the roller contamination suppression effect. Furthermore, by setting the value to the upper limit or below, there is a tendency to improve compatibility with the resin and effectively suppress the formation of roller contamination by the release agent itself.

[0080] Fatty acids can be straight-chain fatty acids, branched-chain fatty acids, or fatty acids with an alicyclic structure, but are preferably straight-chain fatty acids and / or branched-chain fatty acids. Furthermore, fatty acids can be saturated fatty acids or unsaturated fatty acids. Additionally, fatty acids can also be hydroxycarboxylic acids.

[0081] 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.

[0082] Details of fatty acid esters are described here. 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).

[0083] 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, but straight-chain aliphatic alcohols and / or branched-chain aliphatic alcohols are preferred. Additionally, the aliphatic alcohol can be a saturated aliphatic alcohol or an unsaturated aliphatic alcohol, but saturated aliphatic alcohols are preferred.

[0084] In addition, aliphatic alcohols are preferably 1-10 alcohols, and more preferably 1-4 alcohols.

[0085] 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.

[0086] In this embodiment, the fatty acid ester is preferably at least one of a monoester, diester, trimer, 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-strength ester.

[0087] The molecular weight of the fatty acid ester is preferably 100 or more, and more preferably 2000 or less.

[0088] Specific examples of fatty acid esters used in this embodiment, in addition to those illustrated in the examples described later, include 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.

[0089] Next, the details of fatty acid amides will be explained. The number of amide bonds (-C(=O)NH-) in one molecule of fatty acid amide is preferably 1 to 10, more preferably 1 to 4.

[0090] Furthermore, the fatty acid amide is preferably composed of fatty acids and amines. The amine constituting the fatty acid 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.

[0091] Furthermore, aliphatic amines are preferably composed of 1 to 10 amino groups per molecule, and more preferably 1 to 4 amino groups.

[0092] 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 with 7 to 30 carbon atoms and an amine with 1 to 4 amino groups in one molecule. Furthermore, the aliphatic amide is preferably a fatty acid amide that does not have an amino group (-NH2).

[0093] The molecular weight of the fatty acid amide is preferably 100 or more, and more preferably 1000 or less.

[0094] As specific examples of fatty acid amides used in this embodiment, in addition to the examples illustrated in the following embodiments, stearamide, oleamide, erucamide, benzyl amide, palmitamide, ethylene dioleamide, and ethylene dierucamide can also be cited.

[0095] The content of the release agent (B) in the resin composition of this embodiment is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, further preferably 0.01% by mass or more, even more preferably 0.1% by mass or more, and still 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 still more preferably 1% by mass or less. By setting it to the lower limit value or above, there is a tendency to effectively suppress roller contamination during molding. In addition, by setting it to the upper limit value or below, there is a tendency to effectively suppress the reduction of glass transition temperature and toughness.

[0096] It should be noted that in the resin composition of this embodiment, the total amount of polyamide resin (A) and release agent (B) will not exceed 100 by mass.

[0097] The resin composition of this embodiment may contain only one type of release agent (B), or it may contain two or more types. When two or more types are contained, the total amount is preferably within the range described above.

[0098] Furthermore, the resin composition of this embodiment preferably does not contain any release agent other than release agent (B). Specifically, the content of release agent other than release agent (B) in the resin composition of this embodiment is preferably less than 10 parts by weight relative to 100 parts by weight of release agent (B), more preferably less than 5 parts by weight, further preferably less than 3 parts by weight, even more preferably less than 1 part by weight, and still more preferably less than 0.1 parts by weight.

[0099] <Other Ingredients> The resin composition of this embodiment may contain other components besides polyamide resin (A) and release agent (B), or it may not contain other components besides polyamide resin (A) and release agent (B).

[0100] Other components 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, and acid scavengers.

[0101] Furthermore, as long as it does not depart from the scope of the present invention, the resin composition of this embodiment may be combined with the additives described in paragraphs 0047 to 0103 of International Publication No. 2021 / 241471 and the additives described in paragraphs 0041 to 0056 of Japanese Patent Application Publication No. 2023-61203, and these contents are also included in this specification.

[0102] 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.

[0103] Other ingredients may include only one or more. If other ingredients include two or more, it is preferable that their total amount is within the above-mentioned range.

[0104] <Physical Properties of Resin Compositions> The resin composition of this embodiment preferably has excellent transparency.

[0105] Specifically, when the resin composition of this embodiment is molded into a film with a thickness of 300 μm, the total light transmittance is preferably 80% or more, more preferably 85% or more, and even more preferably 90% or more. The upper limit of the total light transmittance is preferably 100%, but even 99% or less can satisfy the desired characteristics.

[0106] 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 0.7% or less, even more preferably 0.5% or less, even more preferably less than 0.3%, 0.28% or less, and 0.25% or less. The lower limit of haze is preferably 0%, but even 0.001% or more can satisfy the desired characteristics.

[0107] Total light transmittance and haze will be measured according to the embodiments described later.

[0108] <Method for manufacturing resin composition> Any method can be used as the method for manufacturing the resin composition of this embodiment.

[0109] For example, it can be obtained by mixing polyamide resin (A) with mold release agent (B) and then performing melt kneading. More specifically, the following method can be used: polyamide resin (A) and mold release agent (B), as well as other components other than polyamide resin (A) and mold release agent (B) as needed, and other components are mixed in a mixing device such as a V-type mixer to form a total mixture, which is then melt kneaded and granulated using an extruder with a vent.

[0110] <membrane> The membrane in this embodiment is formed from the resin composition of this embodiment.

[0111] 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.

[0112] The membrane in this embodiment is preferably highly transparent.

[0113] 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 can meet the desired characteristics.

[0114] Furthermore, the haze of the membrane in this embodiment is preferably 3.0% or less, more preferably 2.5% or less, even more preferably less than 2.0%, even more preferably 1.8% or less, even more preferably 1.7% or less, and even more preferably 1.5% or less. The lower limit of the haze of the above-mentioned membrane is preferably 0%, but even 0.001% or more can satisfy the desired characteristics.

[0115] Total light transmittance and haze were measured according to the embodiments described later.

[0116] <Curling Body> The membrane in this embodiment can be wound onto a core material to form a roll.

[0117] <Polarizing plate> The film formed from the resin composition of this embodiment and the film of this embodiment are preferably used as protective films for polarizers (films that protect polarizing films).

[0118] In this embodiment, the polarizer is preferably a sheet material comprising the film of this embodiment and a polarizing film, and is formed by sequentially stacking the polarizing film and a protective film. That is, the film of this embodiment is preferably used as at least one of the protective films of the polarizer. The protective film is usually attached to the polarizing film via 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 for polarizers or the film of this embodiment. The polarizing film can be a known product, for example, a product in which iodine or dichroic organic dyes are adsorbed or impregnated on a polyvinyl alcohol (PVA) film.

[0119] The adhesive used to bond the film, other protective films, and polarizing film in this embodiment can be a known adhesive, such as acrylic adhesives, polyurethane adhesives, epoxy adhesives, silicone adhesives, and polyvinyl alcohol adhesives. Among these, a polyurethane adhesive is preferred.

[0120] The thickness of the adhesive is typically greater than 1 μm and typically less than 30 μm.

[0121] In addition, the polarizer of this embodiment may also have a mask or other material further disposed on the outside of the film or other protective film of this embodiment.

[0122] Furthermore, in this embodiment, the polarizer is preferably used in the form of a hot-bent molded body after hot bending processing.

[0123] When the film of this embodiment is used for a polarizer, it can be disposed on either side of the polarizing film or on both sides.

[0124] The first method involves heat-bending the film of this embodiment and then placing it on the convex side of the polarizing film, for example, by placing it on the convex side of the polarizing film. Figure 1 The protective film 4 is on one side.

[0125] The second method involves heat-bending the film of this embodiment and then placing it on the concave side of the polarizing film, for example, by placing it on the concave side of the polarizing film. Figure 1 The protective film 3 on one side.

[0126] The third method involves distributing the film of this embodiment on both sides of the polarizing film, for example... Figure 1 Both protective films 3 and 4 are films used in this embodiment.

[0127] It should be noted that, although Figure 1 The lens 1, polarizing film 2, and protective film 3 and 4 in this embodiment have undergone bending processing, but polarizers that have not undergone bending processing are also included in this embodiment.

[0128] The polarizer used in this embodiment, along with other protective films, may be stretched or unstretched. In the first embodiment, stretching is preferred. In the second embodiment, unstretched is preferred.

[0129] In this embodiment, the polarizer is preferably used as a polarizer for liquid crystal display devices, polarizing lenses (sunglasses, ski goggles, spectacle lenses, camera viewfinder lenses), covers for various instruments, polarizers for automotive glass, tram glass, automotive display panels and electronic device housings, silver mirrors for automotive rearview mirrors, helmets, etc., and is particularly preferred for use in sunglasses.

[0130] Example The following examples illustrate the present invention in more detail. The materials, amounts, proportions, processing contents, and processing steps shown in the following examples can be appropriately modified as long as they do not depart from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0131] When the measuring instruments used in the embodiments are difficult to obtain due to reasons such as production stoppage, other devices with equivalent characteristics can be used for measurement.

[0132] 1. Raw materials A1: G850, manufactured by Arkema, is a polyamide resin synthesized from bis(4-amino-3-methylcyclohexyl)methane, sebacic acid, and aminoundecanoic acid (the proportion of aminoundecanoic acid is 17 mol% relative to 100 mol% of the raw material monomers). It is an amorphous polyamide resin.

[0133] A2: 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.

[0134] B1: S-100A, a fatty acid ester manufactured by Riken Vitamin Co., Ltd. B2: EB-P, a fatty acid amide manufactured by Kao Corporation. B3: OHG, manufactured by Daiichi Chemical Industry Co., Ltd., is a mixture whose main components are fatty acid esters composed of hardened castor oil, ricinoleic acid, and glycerol.

[0135] B4: H-476, a fatty acid ester manufactured by Nippon Oil Co., Ltd. B5: Butyl laurate manufactured by Tokyo Chemical Industry Co., Ltd. B6: OHC, a fatty acid metal salt produced by Daiichi Chemical Industry Co., Ltd., calcium 12-hydroxystearate.

[0136] B7: Ethyl hexanoate manufactured by Tokyo Chemical Industry Co., Ltd.

[0137] B8: 12-hydroxystearic acid manufactured by Tokyo Chemical Industry Co., Ltd.

[0138] B9: JP-518-O, phosphate and Oleyl acidphosphate manufactured by Johoku Chemical Co., Ltd.

[0139] 2. Examples 1-10, Comparative Examples 1-6 <Manufacturing of Resin Granules> According to the compositions shown in Tables 1 to 3 below (the contents in Tables 1 to 3 are expressed in parts by mass), the components were mixed in a drum and fed into the base section of a twin-screw extruder (manufactured by Nippon Steel, TEX 30α). The mixture was melt-blended at a barrel temperature of 280°C to produce the pellets of the Examples and Comparative Examples.

[0140] <Membrane Manufacturing> A T-die melt extruder, consisting of a twin-screw extruder (manufactured by Shibaura Machinery Co., Ltd., "TEM-26DS") with a nominal screw diameter of 28 mm and a screw L / D ratio of 40 and equipped with a vent, was used to melt-extrude the granules obtained as described above at a feed rate of 15 kg / h and a screw speed of 250 rpm. After pressing against the first and second rolls, the granules were cooled and solidified to form a film. The process was carried out at a barrel temperature and die temperature of 280°C, and a first and second roll temperature of 120°C. A film with a thickness of 300 μm was obtained. Details of the first and second rolls used are shown below.

[0141] First roller: UM roller manufactured by Shibaura Machinery Co., Ltd. Dimensions: Outer diameter 180mm × Roll width 400mm Second roller: Manufactured by Shibaura Machinery Co., Ltd., metal rigid roller (surface: chrome treated). Dimensions: Outer diameter 180mm × Roll width 400mm Roller contamination The second roll, after consuming 30 kg of raw material when using polyamide A1 and 90 kg of raw material when using polyamide A2, was visually evaluated as follows. The evaluation was conducted by 5 experts, and the judgment was made by majority vote.

[0142] A: No roll contamination was observed, or even if a small amount of roll contamination was observed, it was at a level suitable for practical use.

[0143] B: Roller contamination occurred, exceeding practical standards.

[0144] <Determination of Haze and Total Light Transmittance> Using a haze meter, under the condition 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.

[0145] The haze meter used was the "HM-150" manufactured by Murakami Color Technology Research Institute Co., Ltd.

[0146] [Table 1] [Table 2] [Table 3] As can be seen from the results in Tables 1 to 3, according to the present invention, a film that can effectively suppress roller contamination and has excellent transparency can be obtained.

[0147] In contrast, roller contamination occurred in the absence of a release agent (Comparative Examples 1 and 2) or in the presence of a release agent but using a release agent other than that specified in this invention (Comparative Examples 3 to 6).

[0148] Symbol Explanation 1: Lens; 2: Polarizing film; 3: Protective film; 4: Protective film.

Claims

1. A resin composition, characterized in that: The resin composition comprises: a polyamide resin containing alicyclic diamine units and aliphatic dicarboxylic acid units having 7 to 20 carbon atoms; and a mold release agent. The release agent contains fatty acid esters and / or fatty acid amides. The fatty acids constituting the fatty acid esters and / or fatty acid amides are fatty acids with 7 to 30 carbon atoms.

2. The resin composition according to claim 1, characterized in that: The content of the polyamide resin in the resin composition is 90% by mass or more.

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

4. 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.

5. The resin composition according to claim 1 or 2, characterized in that: The alicyclic diamine unit comprises 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. * represents the bonding site where it is bonded to other units or terminal groups.

6. The resin composition according to any one of claims 1 to 5, characterized in that: The resin composition contains 0.001 to 10% by mass of the release agent.

7. The resin composition according to any one of claims 1 to 6, 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 comprises the unit shown in formula (PA-1). The resin composition contains a release agent in an amount of 0.001 to 10% by mass. 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 a bonding site that is bonded to other units or terminal groups.

8. The resin composition according to any one of claims 1 to 7, characterized in that: The polyamide resin is an amorphous resin.

9. The resin composition according to any one of claims 1 to 8, 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%.

10. The resin composition according to any one of claims 1 to 9, 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.

11. The resin composition according to any one of claims 1 to 10, characterized in that: The resin composition is used as a protective film for polarizers.

12. A film formed from the resin composition according to any one of claims 1 to 11.

13. A polarizer, characterized in that: It includes the film and polarizing film as described in claim 12.

14. A type of sunglasses, characterized in that: It includes the polarizer as described in claim 13.

Images