Resin composition

Abstract

The present invention provides a resin composition having excellent spinnability and dyeability.　Provided is a resin composition comprising a propylene-based polymer A, an ester-based polymer B, and a compound C, wherein: the propylene-based polymer A has a Z-average molecular weight (Mz) of 600,000-750,000; the ester-based polymer B has (i) a heat of fusion of not less than 0 J / g but less than 35 J / g as obtained by differential scanning calorimetry and (ii) a limiting viscosity (IV) of 0.40-1.00 dl / g as measured in a liquid mixture of tetrachloroethane and phenol at 20°C; and the compound C has at least one group selected from the group consisting of heterocyclic groups having two or more heteroatoms, cyclic ether groups, acid anhydride groups, isocyanate groups, and carbodiimide groups.

Description

resin composition

[0001] The present invention relates to a resin composition, and more particularly to a resin composition containing an olefin-based polymer.

[0002] Among thermoplastic resins, olefin polymers are inexpensive and lightweight, and are excellent in properties such as moldability, mechanical properties, heat resistance, and long-term heat degradation resistance. Among these, propylene polymers are widely used as raw materials for pile yarns for ropes, nets, carpets, etc., raw yarns for textiles, and raw yarns for nonwoven fabrics. These fibers are required to be resistant to yarn breakage during spinning (spinnability) or to be resistant to yarn breakage when the obtained fibers are further drawn (drawability).

[0003] Propylene-based polymers are also used in various containers such as bottles, food packaging materials, container caps, stationery, daily necessities, fibers for carpets and sofas, interior and exterior materials for automobiles, parts for electric and electronic devices, building materials such as interior materials for buildings and houses, etc. In recent years, improvements in airtightness, paintability, dyeability, etc., of these articles are often required.

[0004] Patent Document 1 describes that by blending a propylene-based polymer with a poly(hydroxyalkanoate) having a melting point within a specific range and an aromatic polyester having a melting point within a specific range, the compatibility between the propylene-based polymer and the poly(hydroxyalkanoate) is improved, resulting in a resin composition with excellent dyeability. An example of the aromatic polyester is a polycondensate of terephthalic acid and a diol.

[0005] JP 2023-18362 A

[0006] The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a resin composition that is excellent in spinnability and dyeability.

[0007] The present invention provides the following aspects: [1] A resin composition comprising a propylene polymer A, an ester polymer B, and a compound C, wherein the propylene polymer A has a Z-average molecular weight (Mz) of 400,000 or more and 1,050,000 or less, preferably 500,000 or more and 950,000 or less, more preferably 600,000 or more and 900,000 or less, even more preferably 600,000 or more and 750,000 or less, and particularly preferably 640,000 or more and 740,000 or less, and the ester polymer B has: (i) a heat of fusion measured by differential scanning calorimetry of 0 J / g or more and less than 35 J / g, preferably 0 J / g or more and 20 J / g or less, more preferably 0 J / g or more and 10 J / g or less, and (ii) the intrinsic viscosity (IV) measured in a mixed solution of phenol and tetrachloroethane at 20°C is 0.40 to 1.00 dl / g, preferably 0.45 to 0.95 dl / g, more preferably 0.50 to 0.90 dl / g, even more preferably 0.55 to 0.85 dl / g, particularly preferably 0.60 to 0.80 dl / g, and particularly preferably 0.65 to 0.75 dl / g, and compound C has at least one group selected from the group consisting of a heterocyclic group having two or more heteroatoms, a cyclic ether group, an acid anhydride group, an isocyanate group, and a carbodiimide group, The resin composition has, relative to 100 parts by mass in total of Components A to C, an amount of propylene polymer A of 50 parts by mass or more and 98.99 parts by mass or less, preferably 70 parts by mass or more and 98 parts by mass or less, more preferably 80 parts by mass or more and 96 parts by mass or less, and even more preferably 90 parts by mass or more and 95 parts by mass or less; an amount of ester polymer B of 1 part by mass or more and 49 parts by mass or less, preferably 1.5 parts by mass or more and 25 parts by mass or less, more preferably 2.5 parts by mass or more and 10 parts by mass or less, and even more preferably 3.5 parts by mass or more and 8 parts by mass or less; and an amount of compound C of 0.01 parts by mass or more and 49 parts by mass or less, preferably 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.3 parts by mass or more and 10 parts by mass or less, even more preferably 0.3 parts by mass or more and 5 parts by mass or less, particularly preferably 0.5 parts by mass or more and 5 parts by mass or less, and especially preferably 0.5 parts by mass or more and 3 parts by mass or less.

[0008] [2] The resin composition of aspect 1, wherein the propylene polymer A has a ratio (Mz / Mw) of Z-average molecular weight (Mz) to weight-average molecular weight (Mw) of 1 or more and 5 or less, preferably 1.5 or more and 3.5 or less, and more preferably 2 or more and 3 or less.

[0009] [3] The resin composition of Aspect 1 or 2, wherein the ester polymer B has (iii) an intrinsic viscosity (IV) measured in a mixed solution of phenol and tetrachloroethane at 20°C of 0.40 dl / g or more and 1.00 dl / g or less, preferably 0.45 dl / g or more and 0.95 dl / g or less, more preferably 0.50 dl / g or more and 0.90 dl / g or less, and even more preferably 0.55 dl / g or more and 0.85 dl / g or less.

[0010] [4] The resin composition of any one of Aspects 1 to 3, wherein, relative to 100 parts by mass of the total of Components A to C, the amount of the propylene-based polymer A is 70 parts by mass or more and 98 parts by mass or less, the amount of the ester-based polymer B is 1.5 parts by mass or more and 25 parts by mass or less, and the amount of the compound C is 0.1 parts by mass or more and 20 parts by mass or less.

[0011] [5] A molded article of the resin composition of any one of Aspects 1 to 4.

[0012] [6] The molded body of aspect 5, which is a fiber.

[0013] [7] A fiber structure comprising the molded article of embodiment 6.

[0014] [8] The resin composition of any one of Aspects 1 to 4, the molded article of Aspect 5 or 6, or the fiber structure of Aspect 7, further comprising at least one dye selected from the group consisting of reactive dyes, acid dyes, metal complex dyes, direct dyes, sulfide dyes, vat dyes, disperse dyes, anionic dyes, and cationic dyes.

[0015] According to the present invention, a resin composition having excellent spinnability and dyeability is provided.

[0016] Hereinafter, several embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

[0017] <Propylene Polymer A> The resin composition of the present invention contains propylene polymer A. By including propylene polymer A, the resin composition of the present invention exhibits excellent moldability, such as spinnability. The propylene polymer A is a polymer containing 50% by mass or more of structural units derived from propylene. Examples thereof include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-1-butene copolymer, a propylene-1-hexene copolymer, a propylene-1-octene copolymer, a propylene-ethylene-1-butene copolymer, a propylene-ethylene-1-hexene copolymer, and a propylene-ethylene-1-octene copolymer. The propylene polymer A may be a mixture of two or more propylene polymers. The melting point of the propylene polymer A may be 110°C or higher and 180°C or lower. The propylene polymer A can be produced by a known polymerization method using a known polymerization catalyst.

[0018] The propylene polymer A preferably contains a propylene homopolymer. The propylene homopolymer is a polymer composed only of structural units derived from propylene. The mass proportion of the propylene homopolymer in the propylene polymer A may be 50% or more, 80% or more, or even 100% by mass.

[0019] The propylene homopolymer may be a propylene homopolymer having an isotactic structure. Having an isotactic structure means that the isotactic pentad fraction (hereinafter also referred to as [mmmm]) measured using C-NMR is 0.85 or more. This [mmmm] is preferably 0.90 or more, and may be 0.95 or more, 0.96 or more, or 0.97 or more. [mmmm] may be 0.99 or less.

[0020] Here, the isotactic pentad fraction indicates the proportion of isotactic sequences in pentad units in a molecular chain measured using C-NMR, and is the fraction of propylene-derived structural units at the center of a chain in which five consecutive propylene-derived structural units are meso-bonded. Specifically, it is a value calculated as the fraction of the [mmmm] peak among all absorption peaks in the methyl carbon region observed in the C-NMR spectrum. Here, the [mmmm] peak is a peak derived from propylene at the center of a chain in which five consecutive meso-bonded structural units are bonded.

[0021] The [mmmm] can be determined according to the method described in the report by A. Zambelli et al. (Macromolecules, 1973, No. 6).

[0022] The propylene homopolymer can be produced by a known polymerization method using a catalyst system formed by contacting a known solid titanium catalyst component, an organometallic compound catalyst component, and, if necessary, an electron donor; a catalyst system formed by contacting a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring with an alkylaluminoxane; or a catalyst system formed by contacting a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that reacts with the transition metal compound to form an ionic complex, and an organoaluminum compound.

[0023] The propylene polymer A may be any of those containing one type of propylene homopolymer, those consisting of one type of propylene homopolymer, those containing multiple types of propylene homopolymer, and those consisting of multiple types of propylene homopolymer.

[0024] The propylene polymer A may contain, in addition to a propylene homopolymer, a propylene-ethylene copolymer containing 50% by mass or more of structural units derived from propylene. The mass ratio of the propylene-ethylene polymer in the propylene polymer A may be 1% or more, 3% or more, or 20% or less. Addition of a low-melting-point polymer such as a propylene-ethylene copolymer may facilitate side feeding of additives in some cases.

[0025] The weight-average molecular weight (Mw) of the propylene polymer A can be 200,000 or more and 300,000 or less, preferably 210,000 or more and 295,000 or less, and more preferably 220,000 or more and 290,000 or less. By setting the weight-average molecular weight (Mw) to 200,000 or more, the dispersibility of the ester polymer B tends to be improved. Furthermore, by setting the weight-average molecular weight to 300,000 or less, the spinnability and drawability of the fiber tend to be improved.

[0026] The Z-average molecular weight (Mz) of the propylene polymer A is 400,000 or more and 1,050,000 or less. By setting the Z-average molecular weight (Mz) to 400,000 or more, it is possible to obtain fibers with a small fiber diameter. Furthermore, by setting the Z-average molecular weight to 1,050,000 or less, the dispersibility of the ester polymer B in the propylene polymer A becomes good. The Z-average molecular weight (Mz) can be adjusted to a predetermined range by adjusting the degree of polymerization of the polymer. The degree of polymerization tends to increase as the molecular weight increases.

[0027] The lower limit of the Z-average molecular weight (Mz) may be 500,000 or more, 550,000 or more, 600,000 or more, 610,000 or more, 620,000 or more, or 640,000 or more. The upper limit of the Z-average molecular weight (Mz) may be 950,000 or less, or 900,000 or less. Preferably, it is 750,000 or less, 740,000 or less, or 730,000 or less. When the Z-average molecular weight (Mz) is within the above range, the effect of increasing the maximum spinning speed or the effect of improving the spinning yield can be obtained.

[0028] In one embodiment, the Z-average molecular weight (Mz) is preferably 500,000 or more and 950,000 or less, more preferably 550,000 or more and 900,000 or less, even more preferably 600,000 or more and 900,000 or less, particularly preferably 600,000 or more and 750,000 or less, and particularly preferably 640,000 or more and 740,000 or less. In this specification, the weight-average molecular weight (Mw) and the Z-average molecular weight (Mz) are measured by gel permeation chromatography (GPC). At that time, standard polystyrene can be used as a molecular weight standard substance.

[0029] The ratio (Mz / Mw) of the Z-average molecular weight (Mz) to the weight-average molecular weight (Mw) of the propylene polymer A is 1 or more and 5 or less. If Mz / Mw is less than 1, the spinnability of low-fiber fibers may decrease, and if it exceeds 5, the spinning speed may decrease. Mz / Mw is preferably 1.5 or more and 3.5 or less, and more preferably 2 or more and 3 or less.

[0030] The melt mass flow rate (MFR) of the propylene homopolymer measured under conditions of a temperature of 230°C and a load of 2.16 kgf may be, from the viewpoint of processability, 0.1 g / 10 min or more, 1 g / 10 min or more, 3 g / 10 min or more, 5 g / 10 min or more, 10 g / 10 min or more, 15 g / 10 min or more, or 20 g / 10 min or more. The lower limit of the MFR is preferably more than 20 g / 10 min, more preferably 25 g / 10 min or more, and even more preferably 30 g / 10 min or more.

[0031] From the viewpoint of spinnability of the fiber, the MFR may be 100 g / 10 min or less, 80 g / 10 min or less, 70 g / 10 min or less, 60 g / 10 min or less, or 55 g / 10 min or less. The upper limit of the MFR is preferably less than 55 g / 10 min, more preferably 53 g / 10 min or less, and even more preferably 50 g / 10 min or less.

[0032] The MFR is preferably more than 20 g / 10 min and less than 55 g / 10 min, more preferably 25 g / 10 min or more and 53 g / 10 min or less, and even more preferably 30 g / 10 min or more and 50 g / 10 min or less.

[0033] The MFR of the propylene polymer A and other polymers other than the propylene homopolymer are also preferably in the above range for the same reasons as above.

[0034] When the MFR is within the above range, the effect of increasing the maximum spinning speed or the effect of improving the spinning yield tend to be obtained. If the MFR value is too low, the fibers tend to be brittle and easily break during spinning.

[0035] In order to easily adjust the MFR of the propylene polymer A to the above value, the MFR of the propylene homopolymer may also be set to the same value as above.

[0036] The MFR of the propylene polymer A, the MFR of the propylene homopolymer, and the MFR of a polymer other than the propylene homopolymer that falls under the propylene polymer A can be determined in accordance with JIS K 7210-2014.

[0037] The MFR can be adjusted to a predetermined range by adjusting the molecular weight of the polymer. Since the MFR tends to decrease as the degree of polymerization of the polymer increases, i.e., as the molecular weight increases, the degree of polymerization of the polymer can be adjusted so that the MFR falls within the predetermined range.

[0038] <Ester-based polymer B> The resin composition of the present invention contains ester-based polymer B. Ester-based polymer B is a polymer having a plurality of ester bonds in its main chain. Ester-based polymer B may be a mixture of a plurality of types of ester-based polymers. Ester-based polymer B includes, for example, at least one selected from the group consisting of aromatic polyesters and aliphatic polyesters. In one embodiment, ester-based polymer B includes only aromatic polyesters. Aromatic polyester refers to an ester-based polymer having an aromatic hydrocarbon structure (aromatic ring) in its main chain. Aliphatic polyester refers to an ester-based polymer having an aliphatic hydrocarbon structure in its main chain. However, the main chain of the aliphatic polyester does not have an aromatic hydrocarbon structure.

[0039] <Aromatic Polyester> The aromatic polyester may contain a polycondensate of a polycarboxylic acid and a polyol (a polyhydroxy compound). The polycarboxylic acid refers to an organic compound having multiple carboxyl groups or a derivative thereof (e.g., an acid anhydride or an ester). The polyol (a polyhydroxy compound) refers to an organic compound having multiple hydroxy groups.

[0040] In the aromatic polyester, the main chain of the structural unit derived from polycarboxylic acid may have an aromatic ring, the main chain of the structural unit derived from polyol may have an aromatic ring, or both the main chains of the structural unit derived from polycarboxylic acid and the structural unit derived from polyol may have an aromatic ring.

[0041] From the viewpoint of lowering the melting point, it is preferable that the structural unit derived from the polycarboxylic acid has an aromatic ring in the main chain, and the structural unit derived from the polyol does not have an aromatic ring in the main chain. It is more preferable that the structural unit derived from the polyol is aliphatic. The aliphatic includes those containing an oxygen atom.

[0042] Examples of polycarboxylic acids in which the main chain of the structural unit derived from the polycarboxylic acid has an aromatic ring include terephthalic acid, isophthalic acid, orthophthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyl ether 4,4'-dicarboxylic acid, trimellitic acid, trimellitic acid, and derivatives thereof. The polycarboxylic acid may contain one type of polycarboxylic acid or multiple types of polycarboxylic acids.

[0043] The polycarboxylic acid preferably contains terephthalic acid, and the ratio of the number of moles of structural units derived from polycarboxylic acids other than terephthalic acid to the number of moles of structural units derived from all acid components may be 10 mol % or less, 5 mol % or less, 1 mol % or less, or 0.5 mol % or less.

[0044] When the polycarboxylic acid contains terephthalic acid, the polycarboxylic acid may contain other polycarboxylic acid components in addition to terephthalic acid.

[0045] Examples of the other polycarboxylic acid component include the above-mentioned aromatic polycarboxylic acids other than terephthalic acid, and aliphatic polycarboxylic acids such as adipic acid, sebacic acid, succinic acid, dimer acid, 1,4-cyclohexadicarboxylic acid, and derivatives thereof.

[0046] Examples of polyols in which the polyol-derived structural units are aliphatic include aliphatic polyols such as ethylene glycol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 1,3-propanediol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, diethylene glycol, 1,4-cyclohexanediol, and 1,4-cyclohexanedimethanol.

[0047] The polyols may be added singly or in any combination of two or more kinds in any ratio.

[0048] In an aromatic polyester, when the structural unit derived from a polycarboxylic acid has an aromatic ring in the main chain and the structural unit derived from a polyhydroxy compound also has an aromatic ring in the main chain, examples of the polyhydroxy compound having an aromatic ring in the main chain include hydroquinone, 4,4'-dihydroxybiphenyl, and bisphenol A.

[0049] The aromatic polyester may also be a polycondensation product of a monomer that does not contain a polycarboxylic acid. For example, the aromatic polyester may be a polycondensation product of an aromatic hydroxycarboxylic acid in which two H atoms on the aromatic ring are substituted with a hydroxy group and a carboxyl group. Examples of aromatic hydroxycarboxylic acids include parahydroxybenzoic acid and 6-hydroxy-2-naphthalenecarboxylic acid.

[0050] The aromatic polyester may also be a polycondensate of a mixture of an aromatic hydroxycarboxylic acid and at least one of a polyol and a polycarboxylic acid, in which case the polyol and the polycarboxylic acid may each independently be aliphatic or aromatic having an aromatic ring in the main chain.

[0051] <Aliphatic Polyester> The aliphatic polyester may contain a polycondensate of an aliphatic polycarboxylic acid component and an aliphatic polyol component, or a polycondensate of an aliphatic hydroxycarboxylic acid.

[0052] Examples of aliphatic polyesters include polymers of hydroxycarboxylic acids or lactones, polycondensates of diols and dicarboxylic acids, and copolymers thereof. When the ester polymer B is a copolymer, the arrangement of the copolymer may be any of a random copolymer, an alternating copolymer, a block copolymer, a graft copolymer, etc.

[0053] At least a portion of these may be crosslinked with a crosslinking agent such as a polyisocyanate such as xylylene diisocyanate, 2,4-tolylene diisocyanate, etc., or a polysaccharide such as cellulose, acetyl cellulose, ethyl cellulose, etc. Furthermore, at least a portion of these may have any structure such as a linear, cyclic, branched, star-shaped, or three-dimensional network structure, without any limitation, and may be a copolymer with a polyolefin resin or a graft polymer with a polyolefin resin.

[0054] The aliphatic polyesters can be used alone or in combination.

[0055] Examples of hydroxycarboxylic acids include hydroxycarboxylic acids having 2 to 18 carbon atoms, preferably 6 or less carbon atoms, and most preferably 4 carbon atoms. Specific examples include glycolic acid, L-lactic acid, D-lactic acid, D,L-lactic acid, 3-hydroxybutyrate, 3-hydroxyvalerate, 3-hydroxypropionate, 4-hydroxybutyrate, 4-hydroxyvalerate, 5-hydroxyvalerate, 3-hydroxypentenoate, 3-hydroxyhexanoate, 3-hydroxyheptanoate, 3-hydroxyoctanoate, 3-hydroxynonanoate, and 3-hydroxydecanoate.

[0056] Examples of lactones include propiolactone, butyrolactone, valerolactone, caprolactone, and laurolactone.

[0057] The diol is preferably a diol having 2 to 10 carbon atoms. Among these, an aliphatic diol having 2 to 4 carbon atoms or an alicyclic diol having 5 or 6 carbon atoms is more preferable. Specific examples include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexanedimethylol, and 1,4-cyclohexanedimethylol.

[0058] The dicarboxylic acid is preferably an aliphatic dicarboxylic acid having 2 to 12 carbon atoms. Among these, an aliphatic dicarboxylic acid having 2 to 6 carbon atoms or an alicyclic dicarboxylic acid having 5 or 6 carbon atoms is more preferable. Specific examples include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecadicarboxylic acid, dodecadicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,16-hexadecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid, dimer acid and its hydrogenated products, hexahydrophthalic acid, hexahydroisophthalic acid, and hexahydroterephthalic acid. These dicarboxylic acids may also be derivatives such as alkyl esters and acid anhydrides having 1 to 4 carbon atoms.

[0059] Of the above aliphatic polyesters, it is preferable to use polylactic acid, polybutylene succinate, poly(butylene succinate-co-butylene adipate), polycaprolactone, poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), and polyglycolic acid.

[0060] When polylactic acid is used as the aliphatic polyester, the polylactic acid preferably has an L-form ratio of 94 mol % or more in the lactic acid component constituting it, which makes it possible to prevent a decrease in the melting point.

[0061] <Polyhydroxyalkanoate Polymer> The aliphatic polyester may contain a polyhydroxyalkanoate polymer. The polyhydroxyalkanoate polymer is a polyester of a hydroxyalkanoic acid. Examples of the hydroxyalkanoic acid include 2-hydroxyalkanoic acid, 3-hydroxyalkanoic acid, and 4-hydroxyalkanoic acid.

[0062] Examples of 2-hydroxyalkanoic acids are glycolic acid, lactic acid, and 2-hydroxybutyric acid. Examples of polyesters of 2-hydroxyalkanoic acids, that is, poly(2-hydroxyalkanoate)-based polymers, are polyglycolic acid and polylactic acid.

[0063] Examples of 3-hydroxyalkanoic acids are 3-hydroxybutyric acid, 3-hydroxypropionic acid, 3-hydroxypentanoic acid, and 3-hydroxyhexanoic acid. Polyesters of 3-hydroxyalkanoic acids, i.e., poly(3-hydroxyalkanoate) polymers, will be described in detail later.

[0064] Examples of 4-hydroxyalkanoic acids are 4-hydroxybutyric acid, 4-hydroxypentanoic acid, and 4-hydroxyhexanoic acid.

[0065] The polyhydroxyalkanoate polymer may be a homopolymer of a hydroxyalkanoic acid, or a polymer of two or more kinds of hydroxyalkanoic acids.

[0066] <Poly(3-hydroxyalkanoate)-based polymer> The aliphatic polyester may contain a poly(3-hydroxyalkanoate)-based polymer.

[0067] The poly(3-hydroxyalkanoate) polymer is a polyhydroxyalkanoate, i.e., a polycondensate (polyester) of hydroxyalkanoic acid, and necessarily contains a 3-hydroxyalkanoate repeating unit represented by formula (1). In formula (1), R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyano group, an amino group having 1 to 11 carbon atoms, an alkoxy group (alkyloxy group) having 1 to 11 carbon atoms, an amide group having 2 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a monovalent heterocyclic group having 1 to 9 carbon atoms. These groups may have a substituent. In particular, from the viewpoint of compatibility with components other than the ester polymer B contained in the composition (e.g., the propylene polymer A), R is preferably an alkyl group having 1 to 8 carbon atoms, an amide group having 1 to 20 carbon atoms, or an aryl group having 6 to 8 carbon atoms.

[0068] [-O-CHR-CH ２ -CO-]... (1)

[0069] Examples of halogen atoms are F, Cl, Br, and I.

[0070] The alkyl group having 1 to 15 carbon atoms may be linear or branched. The number of carbon atoms in the alkyl group is preferably 1 to 8, and more preferably 1 to 4. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isopentyl group, a 2-methylbutyl group, a 1-methylbutyl group, a hexyl group, an isohexyl group, a 3-methylpentyl group, a 2-methylpentyl group, a 1-methylpentyl group, a heptyl group, an octyl group, an isooctyl group, a 2-ethylhexyl group, a 3,7-dimethyloctyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tetradecyl group, and a pentadecyl group.

[0071] Examples of the amino group having 1 to 18 carbon atoms include an amino group, an alkylamino group, a dialkylamino group, an arylamino group, an alkylarylamino group, a benzylamino group, and a dibenzylamino group.

[0072] Examples of the alkylamino group include a methylamino group, an ethylamino group, a propylamino group, a butylamino group, a pentylamino group, a hexylamino group, a heptylamino group, an octylamino group, a nonylamino group, a decylamino group, a dodecylamino group, an isopropylamino group, an isopentylamino group, a sec-butylamino group, a tert-butylamino group, a sec-pentylamino group, a tert-pentylamino group, a tert-octylamino group, a neopentylamino group, a cyclopropylamino group, a cyclobutylamino group, a cyclopentylamino group, a cyclohexylamino group, a cycloheptylamino group, a cyclooctylamino group, a 1-adamantamino group, and a 2-adamantamino group.

[0073] Examples of the dialkylamino group include a dimethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, a dipentylamino group, a diisopropylamino group, a diisobutylamino group, a diisopentylamino group, a methylethylamino group, a methylpropylamino group, a methylbutylamino group, a methylisobutylamino group, a dicyclopropylamino group, a pyrrolidino group, a piperidino group, and a piperazino group.

[0074] Examples of the arylamino group include an anilino group, a 1-naphthylamino group, a 2-naphthylamino group, an o-toluidino group, an m-toluidino group, a p-toluidino group, a 1-fluoreneamino group, a 2-fluoreneamino group, a 2-thiazoleamino group, and a p-terphenylamino group.

[0075] The alkylarylamino group includes an N-methylanilino group, an N-ethylanilino group, an N-propylanilino group, an N-butylanilino group, an N-isopropylanilino group, and an N-pentylanilino group.

[0076] Examples of the alkoxy group having 1 to 11 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a sec-butoxy group, a tert-butoxy group, a cyclopropoxy group, a cyclobutoxy group, and a cyclopentoxy group.

[0077] The term "amide group" refers to a group in which one hydrogen atom bonded to the nitrogen atom has been removed from a carboxylic acid amide. Examples of the amide group having 1 to 20 carbon atoms include -NH-C(=O)-R groups such as formamide, acetamide, propionamide, butylamide, benzamide, trifluoroacetamide, and pentafluorobenzamide. Ａ (wherein R Ａ represents a hydrogen atom or a monovalent organic group), and -N(-C(=O)-R such as a diformamide group, a diacetamide group, a dipropionamide group, a dibutyroamide group, a dibenzamide group, a ditrifluoroacetamide group, and a dipentafluorobenzamide group. Ａ )(-C(=O)-R Ｂ ) (wherein R Ａ 、 R Ｂ are each independently a hydrogen atom or a monovalent organic group. The organic group may be an alkyl group, an alkoxy group, or an aryl group, each of which may be substituted with a halogen atom. Of these, preferred amide groups are formamide, acetamide, propionamide, butyromide, and benzamide.

[0078] Examples of the aryl group having 6 to 12 carbon atoms include a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a biphenyl group, and among these, a phenyl group, a tolyl group, and a xylyl group are more preferred.

[0079] Examples of heteroatoms in monovalent heterocyclic groups having 1 to 9 carbon atoms include N, O, and S. The heterocyclic groups may be saturated or unsaturated, and may contain a single heteroatom or multiple heteroatoms, or different types of heteroatoms. Examples of such heterocyclic groups include thienyl, pyrrolyl, furyl, pyridyl, piperidinyl, quinolinyl, isoquinolinyl, pyrimidinyl, triazinyl, and thiazolyl groups.

[0080] The repeating units of the aliphatic polyester may consist solely of one or more types of 3-hydroxyalkanoates represented by formula (1), or may have one or more types of 3-hydroxyalkanoates represented by formula (1) and one or more types of other hydroxyalkanoates.

[0081] The aliphatic polyester preferably contains 50 mol % or more, more preferably 70 mol % or more, of the 3-hydroxyalkanoate repeating units represented by formula (1) relative to the total repeating units of hydroxyalkanoate (100 mol %).

[0082] Examples of 3-hydroxyalkanoates represented by formula (1) include those in which R is a hydrogen atom or C ｎ H ２ｎ＋１ where n is an integer of 1 to 15, examples thereof include 3-hydroxybutyrate (hereinafter, sometimes referred to as 3HB) where n=1, 3-hydroxyvalerate (hereinafter, sometimes referred to as 3HV) where n=2, 3-hydroxyhexanoate (hereinafter, sometimes referred to as 3HH) where n=3, 3-hydroxyoctanate (hereinafter, sometimes referred to as 3HH) where n=5, 3-hydroxyoctadecanate (hereinafter, sometimes referred to as 15), and 3-hydroxypropionate where R is a hydrogen atom.

[0083] An example of an aliphatic polyester having only one type of repeating unit represented by formula (1) is poly(3-hydroxybutyrate) (hereinafter, sometimes referred to as P3HB).

[0084] Examples of aliphatic polyesters having only multiple types of repeating units represented by formula (1) include poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (hereinafter, sometimes referred to as P3HB3HH), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (hereinafter, sometimes referred to as P3HB3HV), and poly(3-hydroxybutyrate-co-3-hydroxypropionate) (hereinafter, sometimes referred to as P3HB3HP).

[0085] Examples of hydroxyalkanoates other than the 3-hydroxyalkanoate represented by formula (1) include repeating units represented by formula (2) (wherein R １ is a hydrogen atom or C ｎ H ２ｎ＋１ where n is an integer of 1 or more and 15 or less, and m is an integer of 2 to 10.

[0086] [—O—CHR １-C ｍ H ２ｍ＋１ -CO-]... (2)

[0087] An example of an aliphatic polyester containing repeating units of the formulas (1) and (2) is poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (for example, the following formula (P3HB4HB)).

[0088] From the viewpoint of increasing the melting point, it is preferable that the repeating unit of the aliphatic polyester contains at least 3-hydroxybutyrate among the 3-hydroxyalkanoates represented by formula (1).

[0089] The aliphatic polyester preferably contains 3-hydroxybutyrate repeating units in an amount of 50 mol % or more, more preferably 70 mol % or more, based on the total repeating units of hydroxyalkanoate (100 mol %).

[0090] The aliphatic polyester may have repeat units of two or more types of esters, such as a di-polymer having two types of repeat units, a tri-copolymer having three types of repeat units, and a tetra-copolymer having four types of repeat units, as described above.

[0091] For example, an example of a tri-copolymer is poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-3-hydroxyhexanoate) (hereinafter, sometimes referred to as (P3HB3HV3HH)).

[0092] As described above, the aliphatic polyester preferably contains 3-hydroxybutyrate among the 3-hydroxyalkanoate repeating units represented by formula (1). The proportion XX of 3-hydroxybutyrate repeating units relative to 100 moles of all hydroxyalkanoate ester repeating units is preferably 90 mol% or more, more preferably 95 mol% or more, and even more preferably 98.0 mol% or more.

[0093] The proportion XX is usually 100 mol % or less, preferably 99.9 mol % or less, and more preferably 99.8 mol % or less.

[0094] The arrangement of the copolymer may be any of a random copolymer, an alternating copolymer, a block copolymer, a graft copolymer, and the like.

[0095] The aliphatic polyester may have ester repeating units other than those of formula (1) and formula (2), but the main chain of the other ester repeating units does not contain an aromatic hydrocarbon structure. That is, the aliphatic polyester is an aliphatic polyester. However, it is possible for a group having an aromatic hydrocarbon group to be bonded to a carbon atom in the main chain of the other ester repeating units.

[0096] The constituent ratio of repeating units in the aliphatic polyester can be calculated from the results of NMR measurements such as 1H-NMR and 13C-NMR, as described in L. Tripathi., MC Factories, 11, 44 (2012).

[0097] The aliphatic polyester may also be a mixture of two or more types of poly(3-hydroxyalkanoate) polymers.

[0098] The poly(3-hydroxyalkanoate) polymer may be produced by a microorganism, or may be derived from a compound (such as a cyclic lactone) derived from petroleum or plant materials.

[0099] The poly(3-hydroxyalkanoate) polymer may be one in which each repeating unit of hydroxyalkanoate is composed only of the D-form (R-form), as in those produced from microorganisms, or one in which the repeating unit of hydroxyalkanoate contains both the D-form (R-form) and the L-form (S-form), as in those derived from a mixture of the D-form (R-form) and the L-form (S-form).

[0100] In the poly(3-hydroxyalkanoate) polymer produced from a microorganism, the repeating unit of formula (1) can be represented by the following formula: (BI-1) In formula (BI-1), n ​​represents the degree of polymerization.

[0101]

[0102] For example, poly-(3-hydroxybutyrate) produced from a microorganism has the following structure: (BI-2) where n represents the degree of polymerization.

[0103]

[0104] Furthermore, poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) produced from a microorganism has the following structure: (BI-3) where m and n represent the degree of polymerization.

[0105]

[0106] Furthermore, poly-(3-hydroxybutyrate-co-4-hydroxybutyrate) produced from a microorganism has the following structure: (BI-4) where m and n represent the degree of polymerization.

[0107]

[0108] The aliphatic polyester can be biodegradable.

[0109] For example, poly(3-hydroxyalkanoate) polymers can be produced by microorganisms such as Alcaligenes eutrophus AC32 strain (international deposit under the Budapest Treaty, international depository authority: National Institute of Advanced Industrial Science and Technology International Patent Organism Depositary (6-1 Central, 1-1 Higashi, Tsukuba, Ibaraki Prefecture, Japan), original deposit date: August 12, 1996, transferred on August 7, 1997, accession number FERMBP-6038 (transferred from original deposit FERMP-15786)) (J. Bacteriol., 179, 4821 (1997)), which is obtained by introducing a PHA synthase gene derived from Aeromonas caviae into Alcaligenes eutrophus.

[0110] <Characteristics of Aliphatic Polyester> The weight-average molecular weight (Mw) of the aliphatic polyester can be from 10,000 to 1,000,000, preferably from 20,000 to 800,000, and more preferably from 30,000 to 600,000. By setting the weight-average molecular weight (Mw) to 10,000 or more, it is possible to obtain a molded product excellent in impact strength and tensile elongation. Furthermore, by setting the weight-average molecular weight to 1,000,000 or less, dispersibility in the propylene-based polymer A is improved. The weight-average molecular weight may be 500,000 or less, 400,000 or less, 300,000 or less, 200,000 or less, or 100,000 or less.

[0111] The aliphatic polyester is a thermoplastic resin and may be crystalline.

[0112] The MFR of the aliphatic polyester, measured according to JIS K 7210-2014 at a temperature of 190°C or 170°C and a load of 2.16 kgf, is preferably 0.1 g / 10 min or more and 200 g / 10 min or less. The MFR of the aliphatic polyester may be 1 g / 10 min or more, 3 g / 10 min or more, 5 g / 10 min or more, 7 g / 10 min or more, 8 g / 10 min or more, 10 g / 10 min or more, or 20 g / 10 min or more. The MFR of the aliphatic polyester may be 150 g / 10 min or less, or 100 g / 10 min or less.

[0113] The melting point (Tm) of the aliphatic polyester is preferably 150° C. or higher, and may be 155° C. or higher, 160° C. or higher, 165° C. or higher, 170° C. or higher, or 175° C. or higher. The melting point (Tm) of the ester polymer B may be 220° C. or lower, or may be 200° C. or lower, or may be 190° C. or lower.

[0114] The melting point (Tm) of the aliphatic polyester is measured by differential scanning calorimetry (DSC) in accordance with JIS K 7121, based on the position of the main peak due to the melting of crystals.

[0115] <Characteristics of Ester Polymer B> The ester polymer B used in the resin composition of the present invention is limited to a heat of fusion of less than 35 J / g as determined by differential scanning calorimetry. A large heat of fusion means a high degree of crystallinity. By limiting the upper limit of the heat of fusion of the ester polymer B, the degree of impregnation of the disperse dye is improved, and the degree of dyeing is enhanced.

[0116] The upper limit of the heat of fusion may be 20 J / g or less, or 10 J / g or less. There is no lower limit for the heat of fusion, and it may be 0 J / g. In one embodiment, the heat of fusion is preferably 0 J / g or more and 20 J / g or less, more preferably 0 J / g or more and 10 J / g or less. The heat of fusion can be adjusted by appropriately selecting the type and amount of comonomer.

[0117] Differential scanning calorimetry can be performed in accordance with JIS K 7122-1987. The heating rate is 10°C / min. The heat of fusion can be calculated from the area of ​​the melting peak in the DSC curve during the heating process of the ester polymer B. If no melting peak is observed, the heat of fusion is 0. In the case of an ester polymer B having such a small heat of fusion, a clear melting point is often not observed in DSC. Such an ester polymer B is sometimes called an amorphous aromatic polyester polymer, and can be obtained, for example, by rapidly cooling an aromatic polyester, and is commercially available.

[0118] The ester polymer B has an intrinsic viscosity (IV) of 0.40 dl / g or more and 1.00 dl / g or less at 20°C when obtained using a mixed solution of phenol:tetrachloroethane = 60:40 (mass ratio) as a solvent. A high intrinsic viscosity (IV) of the ester polymer B means a high molecular weight. When the intrinsic viscosity is within the above range, the dispersibility of the ester polymer B is optimized, and the spinnability and stretchability are improved.

[0119] The lower limit of the intrinsic viscosity (IV) may be 0.45 dL / g or more, 0.50 dL / g or more, or 0.55 dL / g or more, and the upper limit of the intrinsic viscosity (IV) may be 0.95 dL / g or less, 0.90 dL / g or less, or 0.85 dL / g or less.

[0120] In one embodiment, the intrinsic viscosity (IV) of the ester polymer B is preferably 0.45 dl / g or more and 0.95 dl / g or less, more preferably 0.50 dl / g or more and 0.90 dl / g or less, even more preferably 0.55 dl / g or more and 0.85 dl / g or less, particularly preferably 0.60 dl / g or more and 0.80 dl / g or less, and particularly preferably 0.65 dl / g or more and 0.75 dl / g or less. The intrinsic viscosity (IV) can be adjusted by the molecular weight of the ester polymer B, etc.

[0121] <Compound C> Compound C is a compound having at least one group selected from the group consisting of a heterocyclic group having two or more heteroatoms, a cyclic ether group, an acid anhydride group, an isocyanate group, and a carbodiimide group in the molecule. In one embodiment, compound C includes a heterocyclic group having two or more heteroatoms. Compound C may have a group other than the heterocyclic group. Compound C may be a mixture of two or more compounds. By containing compound C, the fixation degree of disperse dyes is improved, and a resin composition with excellent dyeability can be obtained.

[0122] Compound C may be a low molecular weight compound, but is preferably a polymer having a weight average molecular weight Mw of 5,000 or more. The Mw of compound C is preferably 50,000 or more and 300,000 or less, more preferably 80,000 or more and 200,000 or less. When compound C is a polymer, the heterocyclic group may be located in the main chain, side chain, or terminal, but is preferably located in the side chain. The polymer may be a block, graft, or random copolymer.

[0123] Examples of heteroatoms contained in the heterocyclic group are N, O, S, and P. The heterocyclic group preferably has two or more types of heteroatoms. An example of a combination of two types is a combination of O and N. The heterocyclic group may be saturated or unsaturated, but is preferably unsaturated. The total number of carbon atoms and heteroatoms constituting the ring may be 3 or more and 9 or less.

[0124] The heterocyclic group is preferably an oxazolyl group, and more preferably a 2-oxazolyl group. The 2-oxazolyl group has a structure represented by the following formula: １ ~R ４ each independently represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms. * represents a bond, and when compound C is a polymer, the oxazolyl group can be bonded directly or via another group to a carbon atom constituting the main chain. Examples of other groups include alkylene groups having 1 to 12 carbon atoms, alkylene groups having 1 to 12 carbon atoms and containing an oxygen atom, and alkylene groups having 1 to 12 carbon atoms and containing a sulfur atom.

[0125]

[0126] Compound C may be a homopolymer of an oxazolyl group-containing monomer, or a copolymer of an oxazolyl group-containing monomer and a non-oxazolyl group-containing monomer.

[0127] Examples of the oxazolyl group-containing monomer include vinyloxazolines {for example, vinyloxazoline (2-vinyl-2-oxazoline, etc.), vinyloxazolines having a substituent [for example, alkyl-vinyloxazolines (for example, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-4,4-dimethyl-2-oxazoline, 2-vinyl-4-ethyl-2-oxazoline, 2-vinyl-4-propyl-2-oxazoline, 2-vinyl-4-butyl-2-oxazoline, C1-20 alkyl-vinyloxazolines such as 2-vinyl-5-methyl-2-oxazoline, 2-vinyl-5-ethyl-2-oxazoline, 2-vinyl-5-propyl-2-oxazoline, and 2-vinyl-5-butyl-2-oxazoline, preferably C1-10 alkyl-vinyloxazoline, and more preferably mono- or di-C1-4 alkyl-vinyloxazoline)], and the like}; isopropenyloxazolines {for example, isopropenyloxazoline (2-isopropyl 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-4,4-dimethyl-2-oxazoline, 2-isopropenyl-4-ethyl-2-oxazoline, 2-isopropenyl-4-propyl-2-oxazoline, 2-isopropenyl-4-butyl-2-oxazoline, 2-isopropenyl-5-methyl- C1-20 alkyl-isopropenyloxazolines such as 2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline, 2-isopropenyl-5-propyl-2-oxazoline, and 2-isopropenyl-5-butyl-2-oxazoline, preferably C1-10 alkyl-isopropenyloxazoline, more preferably mono- or di-C1-4 alkyl-isopropenyloxazoline)], and the like}; and the corresponding allyloxazolines.

[0128] Among these, isopropenyloxazolines are preferred, and 2-isopropenyl-2-oxazoline is particularly preferred, in which case Compound C has a 4,5-dihydro-2-(1-methylethylene)-oxazolyl structural unit.

[0129] The oxazolyl group-containing monomers may be used alone or in combination of two or more kinds.

[0130] The proportion of structural units based on an oxazolyl group-containing monomer in compound C is not particularly limited, but may be, for example, 1% by mass or more (e.g., 5% by mass or more), preferably 10% by mass or more, and more preferably 15% by mass or more, relative to the total amount of compound C.

[0131] In particular, the proportion of structural units based on the oxazolyl group-containing monomer relative to the entire compound C may be 20% by mass or more, preferably 30% by mass or more, more preferably 40% by mass or more (e.g., 45% by mass or more), and can also be 50% by mass or more (e.g., 60% by mass or more, preferably 70% by mass or more).

[0132] Examples of the oxazolyl group-free monomer can be appropriately selected depending on the application of the oxazolyl-containing polymer, and are not particularly limited. Examples include styrene-based monomers or aromatic vinyl-based monomers, such as styrene, α-alkylstyrenes (for example, α-C1-4 alkylstyrenes such as α-methylstyrene), alkylstyrenes (for example, C1-4 alkylstyrenes such as vinyltoluene), halostyrenes (for example, chlorostyrene), etc.); vinyl esters (for example, vinyl acetate, vinyl propionate, etc.); unsaturated nitriles (for example, acrylonitrile, methacrylonitrile, etc.); vinyl esters (for example, vinyl acetate, vinyl propionate ... vinyl ethers (for example, alkyl vinyl ethers such as methyl vinyl ether and ethyl vinyl ether); amide group-containing monomers [for example, (meth)acrylamide, N-substituted (meth)acrylamides (for example, N-alkyl(meth)acrylamides such as N-methyl(meth)acrylamide)]; olefinic monomers [for example, alkenes (for example, C2-10 alkenes such as ethylene, propylene, 1-butene, isobutylene, and 1-octene)]; halogen-containing monomers (for example, halo C2-10 alkenes such as vinyl chloride, vinylidene chloride, and vinyl fluoride);(meth)acrylic monomers {for example, (meth)acrylic acid, (meth)acrylic acid alkyl esters [for example, C1-20 alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, pentyl (meth)acrylate, n-hexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate], cycloalkyl (meth)acrylates [for example, C3-20 cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate], aryl (meth)acrylates [for example, p) C6-20 aryl (meth)acrylate such as phenyl acrylate], aralkyl (meth)acrylate [for example, C6-10 aryl C1-4 alkyl (meth)acrylate such as benzyl (meth)acrylate], (meth)acrylic acid esters having a hydroxy group [for example, hydroxyalkyl (meth)acrylate (for example, hydroxy C2-10 alkyl (meth)acrylate such as 2-hydroxyethyl (meth)acrylate)], (meth)acrylic acid esters having an alkoxy group [for example, alkoxyalkyl (meth)acrylate (for example, C1-10 alkoxy C2-10 alkyl (meth)acrylate such as 2-methoxyethyl (meth)acrylate)], glycidyl (meth)acrylate, etc.}, and the like.

[0133] The non-oxazolyl group-containing monomers may be used alone or in combination of two or more kinds.

[0134] Of these non-oxazolyl group-containing monomers, styrene-based monomers may be particularly preferably used.

[0135] When the oxazolyl group-free monomer contains a styrene-based monomer, the ratio of the structural units derived from the styrene-based monomer to the structural units derived from the oxazolyl group-free monomer may be, for example, 5% by mass or more (e.g., 10% by mass or more), preferably 20% by mass or more (e.g., 30% by mass or more), more preferably 40% by mass or more (e.g., 50% by mass or more), particularly preferably 60% by mass or more (e.g., 70% by mass or more), or may be 80% by mass or more (e.g., 90% by mass or more).

[0136] When a non-oxazolyl group-containing monomer is used, the ratio of the structural units derived from the oxazolyl group-containing monomer to the structural units derived from the non-oxazolyl group-containing monomer may be, for example, the former / latter (mass ratio) = 5 / 95 or more and 99 / 1 or less (e.g., 10 / 90 or more and 98 / 2 or less), preferably 12 / 88 or more and 97 / 3 or less (e.g., 15 / 85 or more and 96 / 4 or less), more preferably 18 / 82 or more and 95 / 5 or less (e.g., 20 / 80 or more and 93 / 7 or less), and may usually be 25 / 75 or more and 99 / 1 or less (e.g., 30 / 70 or more and 98 / 2 or less, preferably 40 / 60 or more and 95 / 5 or less, more preferably 45 / 55 or more and 90 / 10 or less).

[0137] The compound containing an oxazolyl group may be a low molecular weight compound instead of a high molecular weight compound. Examples of low molecular weight compounds include those having, as a structural unit, 2,2'-o-phenylenebis(2-oxazoline), 2,2'-m-phenylenebis(2-oxazoline), 2,2'-p-phenylenebis(2-oxazoline), 2,2'-p-phenylenebis(4-methyl-2-oxazoline), 2,2'-m-phenylenebis(4-methyl-2-oxazoline), 2,2'-p-phenylenebis(4,4'-dimethyl-2-oxazoline), 2,2'-m-phenylenebis(4 ,4'-dimethyl-2-oxazoline), 2,2'-ethylenebis(2-oxazoline), 2,2'-tetramethylenebis(2-oxazoline), 2,2'-hexamethylenebis(2-oxazoline), 2,2'-octamethylenebis(2-oxazoline), 2,2'-ethylenebis(4-methyl-2-oxazoline), or 2,2'-diphenylenebis(2-oxazoline), and those having a divalent group obtained by removing two hydrogen atoms from each of these.

[0138] <Resin Composition> The resin composition of the present invention contains 50 parts by mass or more and 98.99 parts by mass or less of the propylene polymer A relative to 100 parts by mass of the total of the propylene polymer A, the ester polymer B, and the compound C (hereinafter, sometimes referred to as "components A to C"). If the content of the propylene polymer A is less than 50 parts by mass, the viscosity of the resin composition may increase, adversely affecting spinnability, whereas if it exceeds 98.99 parts by mass, dyeability may be insufficient.

[0139] The lower limit of the amount of the propylene polymer A may be 70 parts by mass or more, 80 parts by mass or more, or 90 parts by mass or more, and the upper limit may be 98 parts by mass or less, 96 parts by mass or less, or 95 parts by mass or less. In one embodiment, the amount of the propylene polymer A is preferably 70 parts by mass or more and 98 parts by mass or less, more preferably 80 parts by mass or more and 96 parts by mass or less, and even more preferably 90 parts by mass or more and 95 parts by mass or less.

[0140] The resin composition of the present invention contains ester polymer B in an amount of 1 part by mass or more and 49 parts by mass or less relative to 100 parts by mass of the total of components A to C. If the content of ester polymer B is less than 1 part by mass, dyeability may be insufficient, and if it exceeds 49 parts by mass, spinnability may be insufficient.

[0141] The lower limit of the content of ester polymer B may be 1.5 parts by mass or more, 2.5 parts by mass or more, or 3.5 parts by mass or more, and the upper limit may be 25 parts by mass or less, 10 parts by mass or less, or 8 parts by mass or less. In one embodiment, the content of ester polymer B is preferably 1.5 parts by mass or more and 25 parts by mass or less, more preferably 2.5 parts by mass or more and 10 parts by mass or less, and even more preferably 3.5 parts by mass or more and 8 parts by mass or less.

[0142] The resin composition of the present invention contains compound C in an amount of 0.01 parts by mass or more and 49 parts by mass or less, relative to 100 parts by mass of the total of components A to C. If the content of compound C is less than 0.01 parts by mass, the dyeability of the resin composition may be insufficient, and if it exceeds 49 parts by mass, the spinnability may be insufficient. The lower limit of the content of compound C may be 0.1 parts by mass or more, 0.3 parts by mass or more, or 0.5 parts by mass or more, and the upper limit may be 20 parts by mass or less, 10 parts by mass or less, or 5 parts by mass or less. In one embodiment, the content of compound C is preferably 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.3 parts by mass or more and 10 parts by mass or less, even more preferably 0.3 parts by mass or more and 5 parts by mass or less, particularly preferably 0.5 parts by mass or more and 5 parts by mass or less, and particularly preferably 0.5 parts by mass or more and 3 parts by mass or less.

[0143] The resin composition of the present invention can be spun at a maximum spinning speed of 1,700 m / min or more, and exhibits high spinnability. The maximum spinning speed can be measured by the method described in the Examples. In the Examples, a strand extruded using a multifilament production device under conditions of a resin temperature of 220°C, a nozzle diameter of 0.5 mm, a number of nozzle holes of 24H, and a gear pump rotation speed of 28.9 rpm was wound around a godet roll, and the speed of the godet roll was gradually increased. The maximum spinning speed (m / min) was measured from the speed at which the strand broke.

[0144] The ester polymer B may form a dispersed phase in the propylene polymer A. The ester polymer B forming a dispersed phase means that the resin composition has a sea-island structure in which the propylene polymer A forms a continuous phase (sea portion) and the ester polymer B forms a dispersed phase (islands portion). The average equivalent circle diameter of the dispersed phase (islands portion) is, for example, 10 nm to 400 μm.

[0145] <Additives> The resin composition may contain components other than Components A to C. Examples of components other than Components A to C include additives. The additives may be at least one selected from the group consisting of stabilizers, antibacterial agents, antifungal agents, dispersants, plasticizers, flame retardants, tackifiers, colorants, metal powders, organic powders, inorganic fibers, organic fibers, organic and inorganic composite fibers, inorganic whiskers, and fillers.

[0146] Examples of stabilizers include at least one selected from the group consisting of lubricants, antioxidants, heat stabilizers, light resistance agents, weathering agents, metal deactivators, ultraviolet absorbers, light stabilizers, and copper inhibitors. Examples of light resistance agents include hindered amine-based light resistance agents. Examples of metal powders include ferrite. Examples of colorants include dyes such as organic dyes, or at least one selected from the group consisting of titanium oxide, carbon black, and organic pigments.

[0147] An example of an organic powder is protein. Examples of inorganic fibers are glass fibers and metal fibers. Examples of organic fibers are carbon fibers and aramid fibers. An example of an inorganic whisker is potassium titanate whisker.

[0148] Examples of the filler include at least one selected from the group consisting of glass beads, glass balloons, glass flakes, asbestos, mica, calcium carbonate, talc, silica, calcium silicate, hydrotalcite, kaolin, diatomaceous earth, graphite, pumice, ebonized powder, cotton flock, cork powder, barium sulfate, fluororesin, cellulose powder, and wood flour.

[0149] The resin composition may contain only one of the additives or a combination of two or more of them. The proportion of the additive in the entire resin composition may be 0.01% by mass or more, 0.1% by mass or more, 0.5% by mass or more, less than 50% by mass, 30% by mass or less, 20% by mass or less, 10% by mass or less, or 5% by mass or less.

[0150] In the resin composition, the additive may be contained in any phase of components A to C. The additive may form a dispersed phase separate from the ester polymer B and the compound C in the continuous phase of the propylene polymer A.

[0151] <Method for producing resin composition> The resin composition can be obtained by melt-kneading components A to C and additives added as needed. The kneading temperature (the set temperature of the kneader) is preferably 150°C or higher and 300°C or lower, and more preferably 170°C or higher and 280°C or lower. Alternatively, a resin composition such as pellets can be obtained by melt-kneading a portion of each of components A to C to obtain a pre-kneaded mixture, and then adding the remaining components A to C to the pre-kneaded mixture and further melt-kneading the mixture.

[0152] When an ester polymer having a heat of fusion of less than 35 J / g is melt-kneaded as a raw material, the heat of fusion of the ester polymer dispersed in the propylene polymer A phase in the resulting resin composition such as pellets is likely to be maintained at a low value of less than 35 J / g. Furthermore, even when a resin composition containing the ester polymer having a heat of fusion of less than 35 J / g as a dispersed phase is molded, the heat of fusion of the ester polymer forming the dispersed phase is likely to be maintained at less than 35 J / g.

[0153] Specifically, the resin composition may be in the form of pellets. An example of a method for producing pellets includes a step of extruding the resin composition obtained by melt-kneading through a die to obtain strands, and a step of cutting the strands while cooling or after solidifying them.

[0154] To solidify the strands, the strands may be brought into contact with water, or the strands may be brought into contact with a gas such as air on a belt or the like.

[0155] Known dies, cooling devices, and cutting devices can be used.

[0156] <Method for producing a molded article from a resin composition> Using the above-described resin composition such as pellets as a raw material, a molded article from the resin composition having a desired shape can be obtained using a known resin molding method such as injection molding, extrusion molding, spin molding, vacuum molding, pressure molding, press molding, foam molding, blow molding, or rotational molding. The shape of the molded article is not limited and may be, for example, a film, sheet, plate, fiber, or the like. The molded article can have the same composition as the resin composition of the present invention.

[0157] For example, by melting the resin composition of the present invention and discharging it from a spinneret, fibers with excellent dyeability can be produced. Furthermore, such fibers can be used to produce fiber structures. The structure of the fiber structure containing the fibers is not particularly limited, and may be a woven or knitted fabric woven or woven by a conventional loom or knitting machine. It may also be a fiber structure composed of yarn, wadding, nonwoven fabric, or a matrix fiber and a thermal adhesive fiber.

[0158] The molded article of the resin composition of the present invention, preferably the fiber and fiber structure, can be subjected to a dyeing treatment. The dyeing treatment is not particularly limited, and a conventional dyeing treatment can be used. Dyes used for dyeing include reactive dyes, acid dyes, metal complex dyes, direct dyes, sulfur dyes, vat dyes, disperse dyes, anionic dyes, and cationic dyes.

[0159] Specific examples of reactive dyes include reactive dyes having a vinyl sulfone group, such as Lanasol and Eriofast manufactured by Ciba Specialty Chemicals, and Levafix E and Remazol manufactured by Dystar Japan Co., Ltd., and reactive dyes having a chlorotriazine group, such as Cibacron manufactured by Ciba Specialty Chemicals.

[0160] Specific examples of acid dyes include Suminol Leveling and Aminyl E manufactured by Sumitomo Chemical Co., Ltd., Tection manufactured by Ciba Specialty Chemicals Co., Ltd., Mitsui Acid, Mitsui Nylon Fast, and Nylomine A / B manufactured by Mitsui BASF Dyes Co., Ltd., Telon and Supranol manufactured by Dystar Japan Co., Ltd., Kayacyl manufactured by Nippon Kayaku Co., Ltd., Sandlan E and Nylosan E manufactured by Clariant Japan Co., Ltd., Suminol Milling manufactured by Sumitomo Chemical Co., Ltd., Kayanol Milling manufactured by Nippon Kayaku Co., Ltd., and Mitsui Acid manufactured by Mitsui BASF Dyes Co., Ltd. Examples of suitable grease include Polar manufactured by Chiba Specialty Chemical Co., Ltd., and Sandlan Milling manufactured by Clariant Japan Co., Ltd.

[0161] Specific examples of the metal complex salt type acid dye include 1:1 type dyes such as PalatinFast manufactured by Mitsui BASF Dyes Ltd. and Neolan manufactured by Ciba Specialty Chemicals Inc., and 1:2 type dyes such as Lanyl W manufactured by Sumitomo Chemical Co., Ltd., Lanacron S manufactured by Ciba Specialty Chemicals Inc., Kayalax manufactured by Nippon Kayaku Co., Ltd., Acidol M manufactured by Mitsui BASF Dyes Ltd., Isolan S manufactured by Dystar Japan Ltd., and Lanasyn S manufactured by Clariant Japan Ltd.

[0162] Specific examples of direct dyes include yellow dyes such as C.I. Direct Yellow 4, 5, 11, 12, 50, 86, 87, 127, 130, 132, 142, 147, and 153; orange dyes such as C.I. Direct Orange 15, 34, 39, and 102; brown dyes such as C.I. Direct Brown 195, 209, and 210; red dyes such as C.I. Direct Red 81, 89, 224, 225, 226, 227, 239, 243, 252, and 255; violet dyes such as C.I. Direct Violet 9, 51, and 66; blue dyes such as C.I. Direct Blue 86, 87, 108, 199, 200, 202, 218, 237, 248, 267, 273, 279, and 281; Green dyes such as C.I. Direct Green 59 and 80; and black dyes such as C.I. Direct Black 19, 22, 112, 117, 161, 170, and 171.

[0163] Specific examples of disperse dyes include anthraquinone-based disperse dyes such as C.I. Disperse Red 60, Blue 60, Violet 26, Red 92, and Blue 165, azo-based disperse dyes such as C.I. Disperse Red 184, Red 343, Blue 79, Red 50, Blue 367, Orange 73, and Red 371, monoazo-based disperse dyes such as C.I. Disperse Red 54, Red 73, Blue 183, Yellow 235, and Red 202, and nitro-based disperse dyes such as C.I. Disperse Yellow 42. Examples of the disperse dye include quinoline-based disperse dyes such as C.I. Disperse Yellow 54, and methine-based disperse dyes such as C.I. Disperse Blue 354.

[0164] Furthermore, the resin composition can be laminated with other materials such as other resins, fibers, metals, paper, and leather to produce a multilayer structure.

[0165] The surface of the article molded from the resin composition of the present invention may be subjected to a surface treatment such as embossing, corona discharge treatment, flame treatment, plasma treatment, or ozone treatment.

[0166] The resin composition can be widely used as a resin material. The resin composition and molded articles thereof have excellent dyeability because they contain an ester polymer B having a heat of fusion of 0 J / g or more and 35 J / g or less as measured by differential scanning calorimetry, and a predetermined amount of compound C. The reason for this is unclear, but it is thought that, for example, disperse dyes can be easily impregnated into the resin composition.

[0167] The resin composition of the present invention can be used in applications such as textile materials, exterior construction materials, furniture and interior decoration materials, house materials, toy materials, gardening materials, automobile parts, and packaging materials. Examples of textile materials include fabric materials for clothing, fabric materials for interior use, and textile materials for industrial use; examples of exterior construction materials include carport materials, fence materials, gate materials, gatepost materials, post materials, cycle port materials, deck materials, sunroom materials, roof materials, terrace materials, handrail materials, shade materials, and awning materials; examples of furniture and interior decoration materials include sofa materials, table materials, chair materials, bed materials, chest of drawers, cab net materials, and dresser materials; examples of home appliance materials include clock materials, mobile phone materials, and white goods materials; examples of toy materials include plastic model materials, diorama materials, and video game console materials; examples of gardening materials include planter materials, vase materials, and flowerpot materials; examples of automobile materials include bumper materials, instrument panel materials, and airbag cover materials; and examples of packaging materials include food packaging materials, textile packaging materials, and miscellaneous goods packaging materials. Further, other uses include, for example, monitor components, office automation (OA) equipment components, medical components, drain pans, toiletry components, bottles, containers, snow removal equipment components, and various construction components.

[0168] The present invention will be specifically described below using examples, but these examples do not limit the present invention in any way.

[0169] In the examples and comparative examples, the components blended into the resin compositions are as follows: (1) Propylene polymer A (A-1) Propylene homopolymer MFR (230°C, 2.16 kg load): 7 g / 10 min Melting point (Tm): 163°C

[0170] (A-2) Propylene homopolymer MFR (230°C, 2.16 kg load): 20 g / 10 min Melting point (Tm): 163°C

[0171] (A-3) Propylene homopolymer MFR (230°C, 2.16 kg load): 100 g / 10 min Melting point (Tm): 163°C

[0172] (A-4) Propylene homopolymer MFR (230°C, 2.16 kg load): 0.5 g / 10 min Melting point (Tm): 163°C

[0173] (2) Ester Polymer B (B-1) Aromatic Polyester (trade name) Bellpet IP252B: manufactured by Bell Polyester Products Co., Ltd. Intrinsic viscosity (IV): 0.68 dl / g Heat of fusion (ΔHm): 0 J / g

[0174] (B-2) Aromatic polyester (trade name) Bellpet IK400BR1: manufactured by Bell Polyester Products Co., Ltd. Intrinsic viscosity (IV): 0.58 dl / g Heat of fusion (ΔHm): 0 J / g

[0175] (B-3) Aromatic polyester (trade name) Vylon GK680: manufactured by Toyobo MC Co., Ltd. Intrinsic viscosity (IV): 0.30 dl / g Heat of fusion (ΔHm): 0 J / g

[0176] (B-4) Aromatic polyester (trade name) Bell Polyester PRIT30: manufactured by Bell Polyester Products Co., Ltd. Intrinsic viscosity (IV): 0.78 dl / g Heat of fusion (ΔHm): 35 J / g

[0177] (B-5) Aromatic polyester (trade name) Bellpet E-03: manufactured by Bell Polyester Products Co., Ltd. Intrinsic viscosity (IV): 0.83 dl / g Heat of fusion (ΔHm): 0 J / g

[0178] (4) Compound C (C-1) Oxazoline group-containing polystyrene (trade name) EPOCROS RPS-1005: manufactured by Nippon Shokubai Co., Ltd. MFR (230°C, 2.16 kg load): 27.3 g / 10 min Molecular weight (Mw): 157780 Contained functional group: oxazoline group

[0179]

[0180] The physical properties of each polymer and composition were measured according to the methods shown below.

[0181] (1) Melt mass flow rate (MFR, unit: g / 10 min) Measured according to the method specified in JIS K 7210-2014. The measurement temperature was 230°C or 190°C, and the load was 2.16 kg.

[0182] (2) Weight-average molecular weight (Mw) The weight-average molecular weight (Mw) was calculated based on the results of gel permeation chromatography (GPC). In the GPC measurement, a Waters GPC-150C was used as the measuring device, an ortho-dichlorobenzene solution with a polymer concentration of 0.05 wt % was used, and a mixed polystyrene gel column (Tosoh PSKgel GMH6-HT) was used as the column, at a measurement temperature of 135°C.

[0183] (3) Z-average molecular weight (Mz) The Z-average molecular weight (Mz) was calculated based on the results of gel permeation chromatography (GPC). In the GPC measurement, a Waters GPC-150C was used as the measuring device, an ortho-dichlorobenzene solution with a polymer concentration of 0.05 wt % was used, and a mixed polystyrene gel column (Tosoh PSKgel GMH6-HT) was used as the column, at a measurement temperature of 135°C.

[0184] (4) Intrinsic Viscosity (IV) Using a mixed solution of phenol:tetrachloroethane = 60:40 (weight ratio) as a solvent, the intrinsic viscosity (IV) of the resin was measured at 20°C using an automatic viscometer AVL-6C manufactured by Sun Electronics Industries Co., Ltd.

[0185] (5) Melting point (Tm) of polymer: Measured according to the method specified in JIS K 7121. The measurement temperature was −50° C. or higher and 200° C. or lower, or −50° C. or higher and 250° C. or lower, and the temperature rising rate was 10° C. / min.

[0186] (6) Dyeing Degree To an aqueous solution prepared by mixing 99.8% by mass of an aqueous solution to which acetic acid was added so that the pH of the aqueous solution was 4 to 5 and 0.2 wt% of a disperse dye “Mekicron Navy Blue SPW”, 3 g of fibrous resin composition molded fiber was wound around a wire mesh and flattened, or fibrous resin composition molded fiber was flattened in a cylindrical mesh shape, and the resulting mixture was added, and dyed at 130°C for 45 minutes using a mini color dyeing machine MC-12EL manufactured by Texam Giken.

[0187] The dyed resin composition molded sheet or resin composition molded fiber was mixed with an aqueous solution containing 99.77% by mass of water, 0.3% by mass of sodium hydroxide manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., 0.15% by mass of sodium dithionite, and 0.05% by mass of PEG 4000 manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., and washed at 80°C for 20 minutes.

[0188] The washed resin composition molded sheet or resin composition molded fiber was subjected to a color matching test using a Gretag Macbeth Color-i5 color matching device manufactured by X-Rite, Inc., and the K / S value was calculated based on the formula (X) in accordance with the method specified in JIS K 0117: 2000. A higher K / S value indicates higher dyeability.

[0189] K / S value = (1 - R) ２ / 2R (X) where K is the light absorption coefficient, S is the light scattering coefficient, and R is the surface reflectance.

[0190] (6) Maximum spinning speed A strand extruded using an IKG PMS30-25 multifilament manufacturing device under the conditions of a resin temperature of 220°C, a nozzle diameter of 0.5 mm, a nozzle hole number of 24H, and a gear pump rotation speed of 28.9 rpm was wound around a godet roll, and the speed of the godet roll was gradually increased to measure the maximum spinning speed (m / min) from the speed at which the strand broke. A higher spinning speed indicates higher spinnability.

[0191] (7) Density (g / cm ３ The density of the resin composition was determined in accordance with Method A of the methods specified in JIS K 7112-1999.

[0192] (8) Measurement of Heat of Fusion of Ester Polymer B According to JIS K 7122-1987, a DSC curve was obtained at a temperature rising rate of 10°C / min using a DSCQ100 device manufactured by TA Instruments Co., Ltd. The heat of fusion was calculated from the area of ​​the melting peak.

[0193] DSC measurements were performed on the ester polymer B as a raw material before melt-kneading, pellets of the composition after melt-kneading, and a molded product (sheet or fiber) obtained from the pellets to obtain the heat of fusion of the ester polymer B. Although the pellets and their molded product are compositions, the only component that melts at 175°C or higher is the ester polymer B, and therefore the heat of fusion of the ester polymer B in the pellets and the molded product can be obtained from the DSC curve at 175°C or higher.

[0194] Example 1: 20.0 mass% of polymer (A-1), 47.0 mass% of polymer (A-2), 27.0 mass% of polymer (A-3), 5 mass% of polymer (B-1), and 1 mass% of component (C-1) were uniformly mixed in powder form relative to 100 mass% of components A to C, and then kneaded using a Coperion ZSK32MC at a resin temperature of 230°C and a discharge rate of 80 kg / h to obtain a resin composition. The maximum spinning speed of the resulting resin composition was measured. The MFR of propylene-based polymer A was measured by uniformly mixing polymer (A-1), polymer (A-2), and polymer (A-3) to obtain the composition shown in Table 1, and then measuring the MFR of polymer A using the method described above. In the following other examples and comparative examples, the MFR of propylene-based polymer A was also measured in the same manner.

[0195] The resin composition was then processed into fibers using a 30 mm diameter multifilament manufacturing device manufactured by Chubu Chemical Machinery Co., Ltd., at a resin temperature of 230°C and a fiber thickness of 419 den (17.4 den / 24F). The dyeability of the resulting fibers was evaluated. No fiber breakage or other defects were visually observed during spinning, and the spinning yield was good.

[0196] Example 2 A resin composition and a fiber were produced in the same manner as in Example 1, except that the polymer (B-2) was used instead of the polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. During spinning, no breakage or the like of the fiber was visually confirmed, and the spinning yield was good.

[0197] Example 3 Resin compositions and fibers were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 1. The maximum spinning speed was measured and the dyeability of the fibers was evaluated. During spinning, no breakage or the like of the fibers was visually confirmed, and the spinning yield was good.

[0198] Example 4 Resin compositions and fibers were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 1. The maximum spinning speed was measured and the dyeability of the fibers was evaluated. During spinning, no breakage or the like of the fibers was visually confirmed, and the spinning yield was good.

[0199] Comparative Example 1 A resin composition and a fiber were produced in the same manner as in Example 1, except that 28.0% by mass of polymer (A-3) was used instead of 27.0% by mass of polymer (A-3), and polymer (C-1) was not used. The maximum spinning speed was measured, and the dyeability of the fiber was evaluated. Breakage of the fiber and the like occurred during spinning, and the spinning yield was low.

[0200] Comparative Example 2 A resin composition and a fiber were produced in the same manner as in Example 1, except that the polymer (B-3) was used instead of the polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. Breakage of the fiber occurred during spinning, and the spinning yield was low.

[0201] Comparative Example 3 A resin composition and a fiber were produced in the same manner as in Example 1, except that the polymer (B-4) was used instead of the polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. Breakage of the fiber occurred during spinning, and the spinning yield was low.

[0202] Comparative Example 4 A resin composition and a fiber were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 2. The maximum spinning speed was measured and the dyeability of the fiber was evaluated. The conditions and results are shown in Table 1. Breakage of the fiber occurred during spinning, and the spinning yield was low.

[0203] Comparative Example 5 A resin composition and a fiber were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 2 and polymer (B-5) was used instead of polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. Breakage of the fiber and the like occurred during spinning, and the spinning yield was low.

[0204] Comparative Example 6 A resin composition and a fiber were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 2 and polymer (B-5) was used instead of polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. Breakage of the fiber and the like occurred during spinning, and the spinning yield was low.

[0205] Comparative Example 7 A resin composition and a fiber were produced in the same manner as in Example 1, except that the composition of polymer A was changed as shown in Table 2 and polymer (B-5) was used instead of polymer (B-1). The maximum spinning speed was measured and the dyeability of the fiber was evaluated. Breakage of the fiber and the like occurred during spinning, and the spinning yield was low.

[0206]

[0207]

[0208] From the results in Tables 1 and 2, it can be seen that in Examples 1 to 4, in which molded articles (fibers) produced from the resin composition of the present invention were produced, the maximum spinning speed was higher than in the comparative example, and spinnability was high. Furthermore, in Examples 1 to 4, no thread breakage occurred during spinning, and spinning yield was good. Furthermore, it was found that in Examples 1 to 4, the K / S value was higher than in the comparative example, and dyeability was high. As described above, it can be seen that the molded articles (fibers) produced from the resin composition of the present invention are excellent in productivity such as spinnability and yield, and dyeability.

Claims

1. A resin composition comprising a propylene polymer A, an ester polymer B, and a compound C, wherein the propylene polymer A has a Z-average molecular weight (Mz) of 600,000 or more and 750,000 or less, and the ester polymer B has (i) a heat of fusion measured by differential scanning calorimetry of 0 or more and less than 35 J / g, and (ii) an intrinsic viscosity (IV) measured in a mixture of phenol and tetrachloroethane at 20°C of 0.40 or more and 1.00 dl / g or less, and the compound C has at least one group selected from the group consisting of a heterocyclic group having two or more heteroatoms, a cyclic ether group, an acid anhydride group, an isocyanate group, and a carbodiimide group, a resin composition in which, relative to a total of 100 parts by mass of components A to C, the content of propylene-based polymer A is 50 parts by mass or more and 98.99 parts by mass or less, the content of ester-based polymer B is 1 part by mass or more and 49 parts by mass or less, and the content of compound C is 0.01 parts by mass or more and 49 parts by mass or less.

2. The resin composition according to claim 1, wherein the propylene polymer A has a Z-average molecular weight (Mz) of 500,000 or more and 950,000 or less.

3. The resin composition according to claim 1, wherein the propylene polymer A has a ratio (Mz / Mw) of Z-average molecular weight (Mz) to weight-average molecular weight (Mw) of 1 or more and 5 or less.

4. A molded article of the resin composition according to any one of claims 1 to 3.

5. The molded article according to claim 4, which is a fiber.

6. A fiber structure comprising the molded article according to claim 5.

7. The molded article according to claim 4, further comprising at least one dye selected from the group consisting of reactive dyes, acid dyes, metal complex dyes, direct dyes, sulfur dyes, vat dyes, disperse dyes, anionic dyes and cationic dyes.

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