JP2010095671A - Starch resin composition having good spinnability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a starch resin composition which has improved spinnability, for example, enhanced spinning speed. <P>SOLUTION: The starch resin composition includes: (a) 5-85 mass% of a modified starch; (b) 1-90 mass% of an acid-modified polyolefin which is obtained by graft-modifying a polyolefin with an unsaturated carboxylic acid or its derivative and has a weight-average molecular weight of 5,000-500,000 g/mol, and wherein the content of the unsaturated carboxylic acid or its derivative grafted to the polyolefin is 0.1-2 mass% and the content of the unreacted unsaturated carboxylic acid or its derivative is ≤1,000 ppm; and (c) 2-70 mass% of a plasticizer. It is preferable that the acid-modified polyolefin (b) satisfies the condition that the value of MFR is 50-300 g/10 min, as measured at 190°C with a load of 2.16 kg. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a starch resin composition that can be used as a raw material for fibers such as non-woven fabrics, and more particularly to a starch resin composition having improved spinnability than before.

  Fibers produced by spinning a composition containing starch, thermoplastic resin, plasticizer, etc. (also called starch resin composition, starch polymer composition, etc.) are biodegradable and used for disposable products. It is suitable as a material such as a nonwoven fabric. However, spinning of such a composition is not easy, and improvement in spinnability has been demanded.

  Japanese Patent Application Publication No. 2004-532364 (Patent Document 1) discloses a melt spinning composition containing a modified starch, a thermoplastic polymer, and a plasticizer, and a high damping fiber produced therefrom. JP-T-2004-530057 (Patent Document 2) describes an environmentally degradable multicomponent fiber having a sheath-core structure and the like, and one of its constituent components is unstructured starch and less than 500,000. A biodegradable thermoplastic polymer having a molecular weight of 5 and a plasticizer are disclosed. In Japanese translations of PCT publication No. 2004-530058 (patent document 3), it is a multi-component fiber having a sheath-core structure, etc., and one of its constituent components includes unstructured starch and a molecular weight of less than 500,000. The thing containing the thermoplastic polymer which has and a plasticizer is disclosed.

  US Patent Application Publication No. 2007/0082981 (Patent Document 4) and US Patent Application Publication No. 2007/0082573 (Patent Document 7) include unstructured starch, polyol and ester functional groups. A thermoplastic resin composition with improved water resistance, which contains a reaction product obtained by transesterification of triglyceride and further may contain a thermoplastic resin such as maleic acid-modified polypropylene, is disclosed. Similarly, US Patent Application Publication No. 2007/0082982 (Patent Document 5) and US Patent Application Publication No. 2007/0079945 (Patent Document 6) include unstructured starch, polyol, carboxylic acid, and the like. And a thermoplastic resin composition having improved water resistance, which may further contain a thermoplastic resin such as maleic acid-modified polypropylene. In Examples of these Patent Documents 4 to 7, compositions containing unstructured starch, glycerol, maleic acid-modified polypropylene and the like are exemplified, and these compositions are disclosed as single layers in Patent Documents 4 and 5. The film is processed into bicomponent fibers having a sheath / core structure in US Pat.

However, none of these Patent Documents 1 to 7 describes or suggests the effect that the spinnability can be improved by using the acid-modified thermoplastic polymer as one component of the starch resin composition. In particular, the properties of maleic acid-modified polypropylene used in Examples of Patent Documents 4 to 7 are preferable in terms of improving the spinnability of the starch resin composition, as can be seen from the results of Comparative Examples 7 and 8 described later. Not a thing.
JP-T-2004-532364 Special table 2004-530057 gazette Special table 2004-530058 gazette US Patent Application Publication No. 2007/0082981 US Patent Application Publication No. 2007/0082982 US Patent Application Publication No. 2007/0079945 US Patent Application Publication No. 2007/0082573

  An object of the present invention is to provide a starch resin composition having improved spinnability (spinning speed and the like).

  As the acid-modified thermoplastic polymer, the present inventors set the predetermined conditions for the weight average molecular weight, the graft amount to the polyolefin such as unsaturated carboxylic acid, the amount of unreacted unsaturated carboxylic acid, etc. It has been found that the spinnability of the starch resin composition can be improved by blending the acid-modified polyolefin to be filled at a predetermined ratio, and the present invention has been completed.

That is, the present invention includes the following matters.
[1] A resin composition containing the following components (a), (b) and (c) (the following content is 100% by weight of the total of components (a), (b) and (c)).
(A) Modified starch: 5 to 85% by mass,
(B) An acid-modified polyolefin obtained by graft-modifying a polyolefin with an unsaturated carboxylic acid or a derivative thereof, and having a weight average molecular weight of 5,000 to 500,000 g / mol, grafted to the polyolefin in the acid-modified polyolefin. An acid-modified polyolefin having an amount of unsaturated carboxylic acid or derivative thereof of 0.1 to 2% by mass and an amount of unreacted unsaturated carboxylic acid or derivative thereof contained in the acid-modified polyolefin of 1,000 ppm or less: 1 to 90% by mass,
(C) Plasticizer: 2 to 70% by mass.

  [2] The resin according to [1], wherein the acid-modified polyolefin (b) further satisfies a condition that an MFR measured at 190 ° C. and a load of 2.16 kg is 50 to 300 g / 10 minutes. Composition.

[3] The resin composition according to [1] or [2], wherein the polyolefin is polypropylene.
[4] The resin composition according to any one of [1] to [3], wherein the unsaturated carboxylic acid or derivative thereof is maleic anhydride.

  The starch resin composition having improved spinnability according to the present invention is suitable as a raw material for monocomponent fibers, bicomponent fibers, multicomponent fibers and the like, and leads to improvements in productivity and quality of these fibers.

− Components of starch resin composition −
(A) Modified starch The modified starch (a) to be blended in the starch resin composition of the present invention is a product obtained by destructurizing natural starch by hydrolysis with acid, heat, enzyme or the like, that is, natural starch. A structure in which aminopectin and amylose contained in the granular structure are destroyed to lower the molecular weight, and those similar to those blended in conventional starch resin compositions can be used. Natural starch with a granular structure is poor in fluidity unlike thermoplastic polymers, so it should be sufficiently unstructured so that no lumps remain before melt processing or spinning so as not to affect the fiber spinning process. There must be.

The natural starch used as the raw material for the modified starch (a) is not particularly limited, and maize, waxy maize (a corn variety having starch composed of almost 100% amylopectin), potato, sweet potato, wheat, sago palm, cassava (tapioca) , Starch obtained from rice, soybean, kuzukon, bracken, lotus and the like can be used. These may be used alone or in combination of two or more.

  Various methods are used for destructuring starch, and a typical method is gelatinization by allowing a solvent to act on natural starch. For example, gelatinization can be promoted by applying a shear force to the mixture of natural starch and solvent while heating under pressurized conditions. The unstructured starch obtained by such a method is usually more viscous and gelatinized than non-unstructured starch, but becomes dry and / or slowly cooled to a crystalline state.

  As a solvent for destructuring starch, in addition to water, a compound having one or more hydroxyl groups such as sugar, sugar alcohol, polyol (mannitol, sorbitol, glycerin, etc.), other low molecular weight or monomer plasticizers, etc. Is mentioned. Among these, solvents such as sugar, sugar alcohol, and polyol are substances that also act as a plasticizer (c) in the starch resin composition of the present invention. Therefore, the starch is not removed after destructuring, and modified starch ( You may make it add to a starch resin composition with a). On the other hand, if it is a substance that does not act as a plasticizer (c), it is desirable to use a solvent that can be removed so as not to remain in the spun fiber.

  Although the weight average molecular weight (Mw) of natural starch is very large (for example, Mw of natural corn starch is about 60,000,000 g / mol), the Mw of modified starch (a) is usually 3,000 to 2,000. 1,000 g / mol, preferably 10,000 to 1,000,000 g / mol, more preferably 20,000 to 700,000 g / mol.

  Further, the modified starch (a) may be one in which a part of hydroxyl groups contained therein (for example, about 1 to 6%) is modified by etherification or esterification. For example, compatibility with the acid-modified thermoplastic polymer (b) and the plasticizer (c) can be enhanced by ethoxylation (hydroxyethylation) of the hydroxyl group by reaction with ethylene oxide.

In producing a starch resin composition, a modified starch may be added after preparing a modified starch from natural starch as described above, or a commercially available modified starch may be used. Commercially available modified starches include “Ethylex (registered trademark) 2005” (manufactured by Tate & Lyle, sold by Sumitomo Corporation. Hydroxyethylated and low molecular weight corn starch.), “Corn Alpha” (alpha starch (modified starch) , Sanwa Starch Kogyo Co., Ltd.), Tapioca Alpha (alpha starch (modified starch), Sanwa Starch Co., Ltd.) and Tapi Coat (tapioca processed starch, Sanwa Starch Co., Ltd.) Etc.

  The blending amount of the modified starch (a) is usually 5 to 85% by weight, preferably 20 to 80% by weight in the total 100% by weight of the modified starch (a), the acid-modified thermoplastic polymer (b) and the plasticizer (c). %, More preferably 30 to 70% by weight. By setting the amount of the modified starch (a) within the above range, a starch resin composition having improved spinnability while maintaining good biodegradability can be obtained.

(B) Acid-modified polyolefin The acid-modified polyolefin (b) blended in the starch resin composition of the present invention is a polyolefin graft-modified with an unsaturated carboxylic acid or a derivative thereof.

Examples of (unmodified) polyolefin used for graft modification include polyethylene, polypropylene, ethylene / α-olefin copolymer (ethylene / propylene copolymer), and polypropylene is particularly preferable.

Examples of the unsaturated carboxylic acid or derivative thereof used for graft modification include the following compounds:
Methyl acrylate, ethyl acrylate, butyl acrylate, acrylate-sec-butyl, isobutyl acrylate, propyl acrylate, isopropyl acrylate, 2-octyl acrylate, dodecyl acrylate, stearyl acrylate, hexyl acrylate, Acrylic acid such as isohexyl acrylate, phenyl acrylate, 2-chlorophenyl acrylate, diethylaminoethyl acrylate, 3-methoxybutyl acrylate, diethylene glycol ethoxylate acrylate, and 2,2,2-trifluoroethyl acrylate Esters;
Methyl methacrylate, ethyl methacrylate, butyl methacrylate, methacrylate-sec-butyl, isobutyl methacrylate, propyl methacrylate, isopropyl methacrylate, 2-octyl methacrylate, dodecyl methacrylate, stearyl methacrylate, stearyl methacrylate Methacrylic acid such as hexyl methacrylate, decyl methacrylate, phenyl methacrylate, 2-chlorohexyl methacrylate, diethylaminoethyl methacrylate, 2-hexylethyl methacrylate, -2,2,2-trifluoroethyl methacrylate Esters;
Maleate esters such as ethyl maleate, propyl maleate, butyl maleate, diethyl maleate, dipropyl maleate, dibutyl maleate;
Fumaric acid esters such as ethyl fumarate, butyl fumarate, dibutyl fumarate;
Dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, crotonic acid, nadic acid, methylhexahydrophthalic acid;
Anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride, allyl succinic anhydride, glutaconic anhydride, and nadic anhydride.

Of these unsaturated carboxylic acids or derivatives thereof, anhydrides are preferably used in the present invention, and maleic anhydride is particularly preferably used.
The weight average molecular weight (polystyrene conversion value by gel permeation chromatography (GPC)) of the acid-modified polyolefin (b) is usually 5,000 to 500,000 g / mol, preferably 10,000 to 400,000 g / mol. Preferably, it is 40,000 to 20,000 g / mol.

  The compounding amount of the acid-modified polyolefin (b) is usually 1 to 90% by weight, preferably 3 to 50% by weight, in a total of 100% by weight of the modified starch (a), the modified heat polyolefin (b) and the plasticizer (c). More preferably, it is 5 to 20% by weight. By setting the amount of the acid-modified polyolefin (b) within the above range, the spinnability of the starch resin composition can be improved.

  In the acid-modified polyolefin (b), the amount of the unsaturated carboxylic acid grafted on the polyolefin or a derivative thereof (hereinafter also referred to as “grafting ratio”) is preferably 0.1 to 2% by mass as a KOH titration conversion value. More preferably, it is 0.5-1.5 mass%.

  The melt flow rate (MFR) measured at 190 ° C. and a 2.16 kg load of the acid-modified polyolefin (b) is preferably 50 to 300 g / 10 minutes, more preferably 70 to 250 g / 10 minutes.

The amount of unreacted unsaturated carboxylic acid or derivative thereof (hereinafter also referred to as “unreacted material amount”) contained in the acid-modified polyolefin (b) is preferably 1,000 ppm or less, more preferably 300 ppm or less. The amount of the unreacted unsaturated carboxylic acid or derivative thereof is determined by dissolving the acid-modified polyolefin (b) in a solvent such as xylene, mixing with water, and extracting the unsaturated carboxylic acid or derivative thereof into water. Can be measured by liquid chromatograph.

  By using the acid-modified polyolefin (b) that satisfies the conditions of the graft ratio and the amount of unreacted substances, preferably the MFR conditions, the spinnability of the starch resin composition can be further improved.

  For example, (i) unmodified polyolefin and unsaturated carboxylic acid or a derivative thereof are melt-kneaded in the presence of a polymerization initiator such as an organic peroxide, or (ii) unmodified polyolefin is produced. A method is known in which a modified polyolefin and an unsaturated carboxylic acid or derivative thereof are dissolved in an organic solvent and kneaded in this solution in the presence of a polymerization initiator such as an organic peroxide. Among these, as a method for producing the acid-modified polyolefin (b) satisfying the above-mentioned various conditions, the method (ii) as shown in Examples below is desirable from the viewpoint of easily reducing the amount of unreacted substances.

  The acid-modified polyolefin (b) having the predetermined “weight average molecular weight”, “graft ratio”, “unreacted substance amount”, and more preferably “MFR” is produced according to the method as described in the examples below. can do. In addition, when the acid-modified polyolefin in which the amount of unreacted substances exceeds the above numerical range is obtained, the amount of unreacted substances can be reduced by purification to obtain the heat-modified polyolefin (b) satisfying the above conditions.

(C) Plasticizer The plasticizer (c) blended in the starch resin composition of the present invention is a fiber as a final product having an affinity for both the modified starch (a) and the acid-modified thermoplastic polymer (b). It is a component for improving the flexibility of the resin, and the same ones as those blended in the conventional starch resin composition can be used.

  Examples of the plasticizer (c) include compounds having one or more hydroxyl groups that can be used as a non-structuring agent for the modified starch (a) as described above. Specifically, sugars such as glucose, sucrose, fructose, raffinose, maltodextrose, galactose, xylose, maltose, lactose, mannose erythrose and pentaerythritol; sugar alcohols such as erythritol, xylitol, malitol, mannitol and sorbitol; glycerin And polyols such as ethylene glycol, propylene glycol, dipropylene glycol, butylene glycol and hexanetriol. Of these, glycerin, mannitol and sorbitol are preferable. When these plasticizers (c) are used as a non-structuring agent for starch, they may be left in the modified starch (a) after the non-structuring treatment, or removed or concentrated after the non-structuring processing. Then, a new plasticizer (c) may be added during the preparation of the starch resin composition.

  Other examples of the plasticizer (c) include urea and derivatives thereof; sugar alcohol anhydrides (for example, sorbitan which is an anhydride of sorbitol) and organic acid ester compounds (for example, fatty acid mono-, di- or triglycerides).

  The compounding amount of the plasticizer (c) can be adjusted according to the molecular weight of the modified starch (a) and the acid-modified thermoplastic polymer (b) and the affinity with them. It is usually 2 to 70% by weight, preferably 5 to 55% by weight, more preferably 10 to 50% by weight in the total 100% by weight of the thermoplastic polymer (b) and the plasticizer (c). By setting the amount of the plasticizer (c) within the above range, a starch resin composition excellent in plasticity can be obtained.

(D) Optional component In addition to the above components (a) to (c), the starch resin composition of the present invention is not limited to the effects of the present invention, and other components such as those incorporated in conventional starch resin compositions. These components can be blended as necessary.

  For example, it is preferable to blend (metal) soaps such as sodium salt, magnesium salt, calcium salt and other metal salts of stearic acid, which have the effect of improving the dispersibility of each component in the starch resin composition.

  The starch resin composition of the present invention preferably uses only the acid-modified polyolefin (b) as the thermoplastic polymer, but other thermoplastic polymers blended in the conventional starch resin composition are used. It can also be blended.

In addition, processing aids, antioxidants, slip agents, inorganic fillers, and the like for improving the physical properties (elasticity, tensile strength, elastic modulus, etc.) of the final product fiber may be added.
The blending amount of these optional components can be adjusted according to the type as long as the effects of the present invention are not impaired, but the total of the modified starch (a), the acid-modified polyolefin (b) and the plasticizer (c). The amount is usually less than 50% by weight, preferably 0.1 to 20% by weight, more preferably 0.1 to 12% by weight.

− Manufacturing method −
The starch resin composition of this invention can be manufactured by mixing each component with the method similar to the conventional starch resin composition. For example, the modified starch (a) and the acid-modified polyolefin (b) are mixed in advance, and this mixture and a plasticizer (c) such as glycerol are put into a twin-screw extruder, and are subjected to appropriate conditions (for example, temperature conditions). If there is, there is a method of sufficiently kneading and extruding until uniform, under a temperature higher than the melting point of the acid-modified polyolefin (b) and at which the modified starch (a) does not burn.

− Application −
The starch resin composition of this invention can be used as raw materials, such as a single component fiber, a bicomponent fiber, and a multicomponent fiber similarly to the conventional starch resin composition. Examples of the structure of bicomponent fibers or multicomponent fibers include parallel, sheath-core (sheath-core), radial, ribbon, sea island, etc. The starch resin composition of the present invention has, for example, a sheath-core structure. It is suitable as a raw material for the core portion of component fibers.

  The use of the above fiber is not particularly limited, but for example, it is preferable to process it into a nonwoven fabric. The non-woven fabric is prepared by cooling the above-described fibers with a cooling fluid, further applying tension to the fibers with stretched air to obtain a predetermined fineness, collecting the fibers as they are and depositing them to a predetermined thickness, followed by hot embossing. It can be manufactured by a confounding process such as a process. The nonwoven fabric obtained in this manner is flexible, excellent in surface tactile sensation, and has high friction fastness, and is therefore excellent as a packaging material, a clothing material, a diaper material, and the like.

The starch used in the following examples was manufactured by Tate & Lyle “Ethlex”.
) 2005 "or" Ethlex 2065 ".
(Kneading of composition)
A predetermined amount of raw materials (“Ethlex 2005” or “Ethlex 2065”, glycerin, acid-modified thermoplastic resin, etc.) are mixed in advance and extruded at 175 ° C. with a twin screw extruder. Obtained.

(Evaluation of fiber formability)
The composition was melted by heating at 165 ° C. for 6 minutes, extruded from a cylindrical nozzle having a diameter of 2 mm and a length of 10 mm at a speed of 250 mm / min, and the extruded molten strand was taken out and formed into a centrifugal fiber. The speed at which the molten strand breaks when the take-up speed was increased was measured as “spinning speed”. In the following comparative examples, a spinning speed of 0 m / min means that spinning was not possible from the resin composition.

Example 1
Production of maleic anhydride-modified polypropylene: 5 liters of toluene, 1000 g of polypropylene having a weight average molecular weight of 290,000 and 25 g of maleic anhydride are charged into a 10 liter reaction vessel equipped with a stirrer and heated to 140 ° C. with stirring for 1 hour. Retained. To this, 0.5 liter of toluene in which 5 g of dicumyl peroxide (DCPO) was dissolved was appropriately reduced over 1 hour, and then reacted at 140 ° C. for 3 hours. After completion of the reaction, the reaction solution was cooled to room temperature and poured into 15 liters of ethanol, and then the precipitate was filtered. This precipitate was washed with ethanol and then dried to obtain a maleic anhydride-modified polypropylene prototype (1). This maleic anhydride-modified polypropylene prototype (1) has a weight average molecular weight of 140,000, 190 ° C., a melt flow rate of 95 g / 10 minutes measured at a load of 2.16 kg, and a maleic anhydride graft amount of 0.75% by mass. The unreacted maleic anhydride content was 200 ppm.

Production of resin composition: 60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (1) (weight average molecular weight 140,000, 190 ° C., melt measured at 2.16 kg load) A flow rate of 95 g / 10 min, a maleic anhydride graft amount of 0.75 mass%, an unreacted maleic anhydride content of 200 ppm), 10 parts, and magnesium stearate 0.5 parts in a twin screw extruder under the above conditions. Extrusion gave composition (1). As a result of measuring the spinning speed of the composition (1) by the fiber moldability evaluation method, it was 20 m / min.

(Example 2)
60 parts of "Ethlex 2005", 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (2) produced by the same method as in Example 1 (weight average molecular weight of 55.0)
00, 190 ° C., load of 2.16 kg, melt flow rate 200 g / 10 min, maleic anhydride graft amount 0.75 mass%, unreacted maleic anhydride content 220 ppm) 10 parts, magnesium stearate 0. Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (2). As a result of measuring the spinning speed of the composition (2) by the fiber moldability evaluation method, it was 27 m / min.

(Example 3)
60 parts of "Ethlex 2005", 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (3) produced by the same method as in Example 1 (weight average molecular weight is 110,
000, 190 ° C., load of 2.16 kg, melt flow rate 150 g / 10 min, maleic anhydride graft amount 0.50 mass%, unreacted maleic anhydride content 190 ppm) 10 parts, magnesium stearate 0. 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (3). As a result of measuring the spinning speed of the composition (3) by the fiber moldability evaluation method, it was 48 m / min.

Example 4
60 parts of "Ethlex 2005", 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (4) produced by the same method as in Example 1 (weight average molecular weight of 50,0
The melt flow rate measured at 00, 190 ° C. and a load of 2.16 kg is 230 g / 10 minutes, the maleic anhydride grafting amount is 1.5 mass%, the unreacted maleic anhydride content is 200 ppm), 10 parts, magnesium stearate 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (4). As a result of measuring the spinning speed of the composition (4) by the fiber moldability evaluation method, it was 22 m / min.

(Example 5)
60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (5) produced by the same method as in Example 1 (weight average molecular weight is 170,
000, 190 ° C., load of 2.16 kg, melt flow rate 70 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 180 ppm) 10 parts, magnesium stearate 0. Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (5). As a result of measuring the spinning speed of the composition (5) by the fiber moldability evaluation method, it was 20 m / min.

(Example 6)
70 parts of “Ethlex 2005”, 15 parts of glycerin, maleic anhydride-modified polypropylene prototype (3) produced by the same method as in Example 1 (weight average molecular weight is 110,
000, 190 ° C, load of 2.16 kg, melt flow rate 150 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 190 ppm) 10 parts, magnesium stearate 0. 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (6). As a result of measuring the spinning speed of the composition (6) by the fiber moldability evaluation method, it was 21 m / min.

(Example 7)
40 parts of “Ethlex 2065”, 50 parts of glycerin, maleic anhydride-modified polypropylene prototype (3) produced by the same method as in Example 1 (weight average molecular weight 110,
000, 190 ° C, load of 2.16 kg, melt flow rate 150 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 190 ppm) 10 parts, magnesium stearate 0. Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (7). As a result of measuring the spinning speed of the composition (7) by the fiber moldability evaluation method, it was 15 m / min.

(Example 8)
60 parts of "Ethlex 2005", 30 parts of glycerin, maleic anhydride-modified polypropylene prototype (3) produced by the same method as in Example 1 (weight average molecular weight 110,
000, 190 ° C., 2.16 kg load, melt flow rate 150 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 190 ppm) 5 parts, magnesium stearate 0. Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (8). The spinning speed of the composition (8) was measured by the above-described fiber moldability evaluation method. As a result, it was 23 m / min.

Example 9
"Ethlex 2005" 55 parts, glycerin 20 parts, maleic anhydride modified polypropylene prototype (3) produced by the same method as in Example 1 (weight average molecular weight 110,
000, 190 ° C., load of 2.16 kg, melt flow rate 150 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 190 ppm) 20 parts, magnesium stearate 0. 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (9). As a result of measuring the spinning speed of the composition (9) by the above-described fiber moldability evaluation method, it was 60 m / min.

(Comparative Example 1)
60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (6) produced in the same manner as in Example 1 (weight average molecular weight of 3,000
The melt flow rate measured at 0, 190 ° C. and a load of 2.16 kg is 1500 g / 10 min, the maleic anhydride graft amount is 3.0 mass%, the unreacted maleic anhydride content is 500 ppm), 10 parts, magnesium stearate Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (10). As a result of measuring the spinning speed of the composition (10) by the fiber moldability evaluation method, it was 0 m / min.

(Comparative Example 2)
60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (7) produced in the same manner as in Example 1 (weight average molecular weight of 190,
000, 190 ° C., load of 2.16 kg, melt flow rate 40 g / 10 min, maleic anhydride graft amount 0.5 mass%, unreacted maleic anhydride content 150 ppm) 10 parts, magnesium stearate 0. 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (11). The spinning speed of the composition (11) was measured by the fiber moldability evaluation method, and found to be 0 m / min.

(Comparative Example 3)
60 parts of "Ethlex 2005", 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (7) produced by the same method as in Example 1 (weight average molecular weight of 165,
000, 190 ° C., load of 2.16 kg, melt flow rate of 41 g / 10 min, maleic anhydride graft amount 0.3 mass%, unreacted maleic anhydride content 120 ppm) 10 parts, magnesium stearate 0. 5 parts were extruded with a twin screw extruder under the above conditions to obtain a composition (12). The spinning speed of the composition (12) was measured by the fiber moldability evaluation method, and found to be 0 m / min.

(Comparative Example 4)
60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (9) produced by the same method as in Example 1 (weight average molecular weight 200,
000, 190 ° C., load of 2.16 kg, melt flow rate 35 g / 10 min, maleic anhydride graft amount 0.15 mass%, unreacted maleic anhydride content 110 ppm) 10 parts, magnesium stearate 0. Five parts were extruded by a twin screw extruder under the above conditions to obtain a composition (13). The spinning speed of the composition (13) was measured by the fiber moldability evaluation method, and found to be 0 m / min.

(Comparative Example 5)
Production of maleic anhydride-modified polypropylene: 10 kg of polypropylene having a weight average molecular weight of 700,000, 80 g of maleic anhydride and 80 g of t-butylperoxybenzoate were dry blended, and then melt-kneaded at 210 ° C. with a twin-screw kneader to obtain maleic anhydride. An acid-modified polypropylene prototype (10) was obtained. This maleic anhydride modified polypropylene prototype (10) has a weight average molecular weight of 220,000, 190 ° C. and a melt flow rate of 1 measured at a load of 2.16 kg.
9 g / 10 minutes, the maleic anhydride graft amount was 0.6 mass%, and the unreacted maleic anhydride content was 500 ppm.

Production of resin composition: 60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride modified polypropylene prototype (10) (weight average molecular weight 220,000, 190
The melt flow rate measured at a temperature of 2.16 kg at 19 ° C. was 10 g, the maleic anhydride graft amount was 0.6 mass%, the unreacted maleic anhydride content was 500 ppm), 10 parts, and magnesium stearate 0.5 parts The composition (14) was obtained by extrusion with a twin screw extruder under the above conditions. As a result of measuring the spinning speed of the composition (14) by the fiber moldability evaluation method, it was 0 m / min.

(Comparative Example 6)
60 parts of “Ethlex 2005”, 25 parts of glycerin, maleic anhydride-modified polypropylene prototype (11) produced by the same method as in Example 1 (weight average molecular weight 350,000, 190 ° C., 2.16 kg load) The melt flow rate measured in 1) was 3 g / 10 min, the maleic anhydride graft amount was 0.6 mass%, the unreacted maleic anhydride content was 100 ppm), 10 parts, and 0.5 parts of magnesium stearate were biaxially treated under the above conditions. The composition (15) was obtained by extrusion with an extruder. The spinning speed of the composition (15) was measured by the fiber moldability evaluation method, and found to be 0 m / min.

(Comparative Example 7)
“Ethlex 2005” 60 parts, glycerin 25 parts, maleic anhydride modified polypropylene “Epolen G3003” manufactured by Eastman (weight average molecular weight 100,000, 190 ° C., measured at 2.16 kg load) 170 g / 10 min, maleic anhydride graft amount 0.95 mass%, unreacted maleic anhydride content 1900 ppm) 10 parts, magnesium stearate 0.5 parts was extruded in a twin screw extruder under the above conditions. Product (16) was obtained. As a result of measuring the spinning speed of the composition (16) by the fiber moldability evaluation method, it was 10 m / min.

(Comparative Example 8)
"Ethlex 2005" 60 parts, glycerin 25 parts, polypropylene prototype (12) (weight average molecular weight 140,000, 230 ° C, melt flow rate measured at 2.16 kg load 35 g / 10 min, anhydrous maleic The composition (17) was obtained by extruding 10 parts of an acid graft amount of 0% by mass and an unreacted maleic anhydride content of 0 ppm) and 0.5 part of magnesium stearate with a twin screw extruder under the above conditions. The spinning speed of the composition (17) was measured by the fiber moldability evaluation method, and found to be 0 m / min.

Claims (4)

A resin composition containing the following components (a), (b) and (c) (the following content is 100% by weight of the total of components (a), (b) and (c)).
(A) Modified starch: 5 to 85% by mass,
(B) An acid-modified polyolefin obtained by graft-modifying a polyolefin with an unsaturated carboxylic acid or a derivative thereof, and having a weight average molecular weight of 5,000 to 500,000 g / mol, grafted to the polyolefin in the acid-modified polyolefin. An acid-modified polyolefin having an amount of unsaturated carboxylic acid or derivative thereof of 0.1 to 2% by mass and an amount of unreacted unsaturated carboxylic acid or derivative thereof contained in the acid-modified polyolefin of 1,000 ppm or less: 1 to 90% by mass,
(C) Plasticizer: 2 to 70% by mass.   2. The resin composition according to claim 1, wherein the acid-modified polyolefin (b) further satisfies the condition that the MFR measured at 190 ° C. and a load of 2.16 kg is 50 to 300 g / 10 minutes.   The resin composition according to claim 1, wherein the polyolefin is polypropylene.   The resin composition according to any one of claims 1 to 3, wherein the unsaturated carboxylic acid or derivative thereof is maleic anhydride.