JP2002114899A - Resin composition and its application - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent resin composition having biodegradability, transparency, flexibility and gas-barrier properties, hardly causing bleeding out with the lapse of time, having excellent moldability, usable as various formed and processed products obtained by various kinds of forming and processing methods, and capable of providing the formed and processed product exhibiting good biodegradability in a natural environment when being disposed of after the use. SOLUTION: This resin composition is characterized in that the composition comprises (A) 30-95 pts.wt. polylactic acid-based resin having the biodegradability and (B) 70-5 pts.wt. specific polyalkylene carbonate [when the total of the components (A) and (B) is 100 pts.wt.].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a resin composition comprising a polylactic acid-based resin and a polyalkylene carbonate and its use. Specifically, the present invention is a resin composition comprising a polylactic acid-based resin and a polyalkylene carbonate, having excellent properties such as flexibility, transparency, heat resistance and gas barrier properties, and having a decomposability in a natural environment after use, and Regarding its use.

[0002]

BACKGROUND OF THE INVENTION In general, as resins having flexibility and excellent transparency and heat resistance, resins such as soft polyvinyl chloride, soft polyvinylidene chloride, polypropylene and polyethylene are known. However, when these resins are disposed after use, they increase the amount of trash and are hardly decomposed in the natural environment. Therefore, they remain semi-permanently in the ground even when buried. In addition, abandoned plastics cause problems such as degrading the landscape and destroying the living environment of marine life.

On the other hand, as resins having biodegradability, polylactic acid and copolymers of polylactic acid and other aliphatic polyesters (hereinafter referred to as polylactic acids), aliphatic polyhydric alcohols and aliphatic polycarboxylic acids are used. Derived polyesters and the like have been developed. Some of these resins are 100% biodegradable within months to a year in animals, or
When placed in soil or seawater, in moist environments, it can begin to decompose in a few weeks and disappear in about one to several years.
Furthermore, the decomposition product of the biodegradable resin has the property of being harmless to the human body into lactic acid, carbon dioxide, and water.

[0004] Among these biodegradable resins, polylactic acids, in particular, have recently come to produce L-lactic acid as a raw material in large quantities and at low cost by fermentation.
Due to its excellent characteristics such as high rigidity, it is expected to expand its field of use. However, containers and packaging materials obtained by molding polylactic acid by ordinary extrusion molding or the like have excellent rigidity, but poor flexibility, and polylactic acid has poor flexibility such as tubes and wrap films. It is not suitable for packaging material applications characterized by

As a technique for imparting flexibility to polylactic acid, generally, as in the technique for softening a resin, a method of adding a plasticizer, a method of blending a soft polymer, a method of copolymerizing another monomer, and the like are used. Can be considered. However, when a plasticizer is added, the plasticizer bleeds out with the passage of time, and is liable to cause deterioration in quality such as stickiness and transparency.In addition, gas barrier properties and physical properties such as fragrance retention tend to be reduced. There's a problem. Further, when blended with a soft polymer, there is a problem that the transparency is apt to be lowered because the compatibility is not always good. further,
The method of copolymerizing other monomers requires the use of a large-scale reaction apparatus for the preparation, and requires a long time for the reaction, so that it is not a simple method.

Therefore, a resin composition containing a resin having biodegradability, such as polylactic acid, has improved gas barrier properties without impairing the excellent properties of the resin having biodegradability, There has been a demand for a resin composition having improved flexibility without causing bleed-out or the like. The present inventor has conducted intensive studies in view of such circumstances, and as a result, a polylactic acid-based resin having biodegradability and a resin composed of a specific polyalkylene carbonate have biodegradability, and are flexible. The inventors have found that the present invention is also excellent in such properties as the above, and have completed the present invention.

JP-A-6-345596 describes a resin composition comprising polyethylene carbonate and a biodegradable synthetic polymer such as poly (3-hydroxybutyric acid) or polycaprolactone and / or a natural polymer such as starch. It is disclosed and demonstrates excellent biodegradability. However, transparency, which is an important physical property value for packaging materials such as films, has not been considered much. Japanese Patent Application Laid-Open No. H11-140292 discloses a resin composition containing polylactic acid and polycarbonate. According to this, no consideration is given to gas barrier properties, and the polycarbonate described is expected to have a low glass transition temperature, so that the gas barrier properties of the obtained resin composition may be worse than that of polylactic acid. is expected.

[0008]

An object of the present invention is to provide a resin composition which is excellent in flexibility, transparency, heat resistance and gas barrier properties, in addition to the excellent degradability inherent in a polylactic acid resin having biodegradability. It is intended to provide uses.

[0009]

SUMMARY OF THE INVENTION The resin composition of the present invention comprises (A) a polylactic acid-based resin having biodegradability: 30 to 95 parts by weight and (B) a polyalkylene carbonate represented by the following formula (I): 7
0 to 5 parts by weight (however, the total of (A) and (B) is 100
Wherein the haze value is 40% or less when a pressed film having a thickness of 0.1 mm is formed from the resin composition.

[0010]

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[R is an ethylene group, a propylene group and a group represented by the general formula (II):

[0012]

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(Where R ¹ and R ² represent the same or different alkylene groups having 2 to 6 carbon atoms, and p is 1 to 1)
5 represents an integer of 5), m represents an integer of 1 to 15, and n represents
Represents an integer of 3 to 15,000. ].

In the resin composition of the present invention, the biodegradable polylactic acid-based resin (A): 40 to 90 parts by weight and the polyalkylene carbonate (B): 60 to 10 parts by weight (provided that (A) And the total of (B) is 100 parts by weight), and when a pressed film having a thickness of 0.1 mm is formed from the resin composition, one having a haze value of 40% or less is particularly preferable.

In the present invention, the polyalkylene carbonate (B) is particularly preferably polyethylene carbonate. Further, from the resin composition
When a 0.5mm thick press sheet is formed,
A resin composition having a Young's modulus of 2500 MPa or less is preferred. Further, when a 0.1 mm-thick press film is formed from the resin composition, a resin composition having a carbon dioxide gas transmission coefficient at 25 ° C. of 85 cc mm / m ² day atm or less is preferable.

Such a resin composition according to the present invention is preferably used for producing a molded product such as a film, a stretched film, an injection molded product, a blow molded product, a laminate, a tape, a nonwoven fabric, and a thread.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be specifically described below. The resin composition of the present invention contains (A) a polylactic acid-based resin having biodegradability and (B) a polyalkylene carbonate. First, each of these components will be described.

(A) Polylactic acid resin having biodegradability Polylactic acid resin having biodegradability used in the present invention (A)
Any structure may be used as long as it is a polylactic acid-based resin that is biodegradable, and any structure can be suitably used. In the present invention, the term "having biodegradability" refers to, for example, ISO14855 (JISK695).
3) In "determination of aerobic ultimate biodegradation and disintegration degree under controlled composting conditions", it means that biodegradation is recognized.
Those that decompose by 0% or more are more preferable.

In the present invention, specific examples of the biodegradable polylactic acid resin (A) include polylactic acid, lactic acid-hydroxycarboxylic acid copolymer and lactic acid-aliphatic polyhydric alcohol-aliphatic polybasic acid. Copolylactic acid such as copolymer, and polylactic acid and lactic acid-hydroxycarboxylic acid copolymer and lactic acid-
Polymer blends such as a mixture of an aliphatic polyhydric alcohol-aliphatic polybasic acid copolymer and a polymer alloy are included.

The raw materials for the polylactic acid resin include lactic acid and hydroxycarboxylic acid, aliphatic polyhydric alcohol,
Aliphatic polybasic acids and the like are used. Specific examples of the lactic acids include, for example, L-lactic acid, D-lactic acid, DL-lactic acid or a mixture thereof, or lactide which is a cyclic dimer of lactic acid.

Specific examples of hydroxycarboxylic acids that can be used in combination with lactic acids include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 5-hydroxyvaleric acid and 6-hydroxycaproic acid. And a cyclic ester intermediate of hydroxycarboxylic acid, for example, glycolide which is a dimer of glycolic acid, and ε-caprolactone which is a cyclic ester of 6-hydroxycaproic acid.

Specific examples of the aliphatic polyhydric alcohol which can be used in combination with lactic acid include ethylene glycol, diethylene glycol, triethylene glycol, and the like.
Polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4
-Butanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol, polytetramethylene glycol, 1,4-cyclohexanedimethanol,
4-benzenedimethanol and the like.

Specific examples of the aliphatic polybasic acids that can be used in combination with lactic acids include succinic acid, oxalic acid, malonic acid, glutaric acid, adibic acid, bimeric acid, suberic acid, azelaic acid, sebacic acid, and the like. Undecandioic acid, dodecandioic acid, phenylsuccinic acid, 1,4-phenylenediacetic acid and the like can be mentioned. These can be used alone or in combination of two or more.

Examples of the polylactic acid-based resin that can be used in the present invention include the following (1) to (4). (1) Lactic acid homopolymer. (2) Copolylactic acid produced from 50% by weight or more of lactic acid and 50% by weight or less of a hydroxycarboxylic acid other than lactic acid. (3) Copolylactic acid produced from 50% by weight or more of lactic acid and 50% by weight or less of an aliphatic polyhydric alcohol and an aliphatic polybasic acid. (4) Copolylactic acid produced from 50% by weight or more of lactic acid and 50% by weight or less of lactic acid other than hydroxycarboxylic acid, aliphatic polyhydric alcohol and aliphatic polybasic acid.

The copolylactic acid may be a random copolymer, a block polymer, or a mixture of both. Embodiments of copolylactic acid that can be preferably used in the present invention include, for example, the following. (1) A lactic acid block copolymer formed from 50% by weight or more of lactic acid and 50% by weight or less of caproic acid. (2) 50% by weight or more of lactic acid and 50% by weight or less of 1,
Lactic acid block copolymer produced from 4-butanediol and succinic acid. (3) A block copolymer comprising 50% by weight or more of a polylactic acid segment and 50% by weight or less of a polycaproic acid segment. (4) A block copolymer comprising 50% by weight or more of a polylactic acid segment and 50% by weight or less of a polybutylene succinate segment.

In the present invention, as the polylactic acid-based resin, a lactic acid homopolymer, a block copolymer having a polylactic acid segment and a polybutylene succinate segment and / or a polycaproic acid segment can be particularly preferably used. The weight average molecular weight (Mw) and molecular weight distribution of the polylactic acid resin preferably used in the present invention are as follows:
There is no particular limitation as long as it can be formed substantially.

The molecular weight of the polylactic acid resin used in the present invention is not particularly limited as long as it exhibits substantially sufficient mechanical properties. In general, the weight average molecular weight (Mw) is generally used.
Are preferably 10,000 to 500,000, more preferably 30,000 to 400,000, and still more preferably 50,000 to 300,000. In general, when the weight average molecular weight (Mw) is smaller than 10,000, mechanical properties are not sufficient, and when the molecular weight exceeds 500,000, handling becomes difficult or uneconomical. is there.

The polylactic acid of these embodiments can be used alone or in any combination of two or more. In the present invention, the method for producing the biodegradable polylactic acid-based resin (A) is not particularly limited, but specific examples include the following methods. (1) A method of directly performing dehydration polycondensation using lactic acid or a mixture of lactic acid and hydroxycarboxylic acid as a raw material (for example,
Production method disclosed in JP-A-6-65360). (2) Indirect polymerization method for melt-polymerizing a cyclic dimer of lactic acid (lactide) (for example, US Pat. No. 2,758,987)
Production method). (3) cyclic dimers of the above lactic acids and hydroxycarboxylic acids, for example, lactide and glycolide, or ε
A ring-opening polymerization method in which a cyclic ester intermediate such as caprolactone is melt-polymerized in the presence of a catalyst (U.S. Pat.
57, 537).

In producing the polylactic acid resin, an aliphatic polyhydric alcohol such as glycerin and trimethylolpropane, an aliphatic polybasic acid such as butanetetracarboxylic acid, and a polyhydric alcohol such as polysaccharide are used. Kind,
The molecular weight may be increased by using a binder (polymer chain extender) such as diisocyanate.

When a raw material is directly dehydrated and polycondensed to produce a polylactic acid resin, the raw material lactic acid or lactic acid and hydroxycarboxylic acid are preferably used in the presence of an organic solvent, especially a phenyl ether solvent. By azeotropic dehydration condensation, particularly preferably by subjecting the solvent obtained by removing water from the solvent distilled off by azeotropic distillation to a substantially anhydrous solvent and polymerizing it by a method of returning to the reaction system, a high strength having a strength suitable for the present invention is obtained. A polylactic acid resin having a molecular weight can be obtained.

In the present invention, the content of the lactic acid component in the monomer system when polymerizing polylactic acid is 50% by weight or more, preferably 60% by weight or more, more preferably 70% by weight or more, and 80% by weight. % Or more is more preferable. Polyalkylene carbonate (B) The polyalkylene carbonate (B) in the present invention is:
It is represented by the following formula (I).

[0032]

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[R is an ethylene group, a propylene group and a group represented by the general formula (II):

[0034]

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(Where R ¹ and R ² represent the same or different alkylene groups having 2 to 6 carbon atoms, and p is 1 to 1)
M is 1 to 15, preferably 1 to 10
And n is 3 to 15,000, preferably 1
Represents an integer of 0 to 10,000. Here, as the group represented by the general formula (II), a group in which p is an integer of 1 to 2 is preferable. Specifically, 3-oxapentanylene with p = 1 and 3-oxapentanylene Oxahexanylene, 3-oxaheptanylene, 3-oxa-1-methylpentanylene, 3-
An oxa-1-methylhexanylene group is preferred.

The polyalkylene carbonate (B) used in the present invention may be any one of the alkylene groups represented by R in the above formula (I) other than the ethylene group, the propylene group and the group represented by the above general formula (II). Other alkylene groups may be contained within a range that does not impair the characteristics of the present invention, preferably within a range of 20 mol% or less of the alkylene groups. Examples of the alkylene group include methylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, nonamethylene,
Decamethylene, dodecamethylene, ethylethylene, 1,2-
Saturated aliphatic groups such as dimethylethylene, 1,1-dimethylethylene, propylethylene, 1-ethyl-2-methylethylene, butylethylene, pentylethylene, hexylethylene, octylethylene, 1,2-cyclopentylene,
Alicyclic groups such as 3-cyclopentylene, 1,2-cyclohexylene, 1,3-cyclohexylene, 1,4-cyclohexylene, 1,3-cyclohexanedimethylene, 1,4cyclohexanedimethylene, cyclohexylethylene , Vinyl ethylene,
And unsaturated aliphatic groups such as allylethylene and isopropenylethylene. Also, styrene, benzylethylene, m-phenylene, p-phenylene, 4,4'-diphenylene, 4,4'-bisphenylene-2,2-propane, 4,4'-bisphenylene-sulfone, trifluoromethylethylene Or a group containing an aromatic or hetero element.

As the polyalkylene carbonate (B) used in the present invention, it is particularly preferable that 80 mol% or more of the alkylene group represented by R in the above formula (I) is constituted by ethylene groups, and 90 mol % Or more is particularly preferably composed of ethylene groups. Among these, polyethylene carbonate is particularly preferred. Alternatively, it is preferable that 80 mol% or more of the alkylene group represented by R in the above formula (I) is composed of an ethylene group and a propylene group, and 90 mol% or more is composed of an ethylene group and a propylene group. Is preferred.

Alternatively, it is preferable that 80 mol% or more of the alkylene group represented by R in the above formula (I) is composed of ethylene groups and trimethylene groups, and 90 mol% or more is composed of ethylene groups and trimethylene groups. Preferably, it is configured. The molecular weight of the polyalkylene carbonate (B) used in the present invention is not particularly limited, but generally, the weight average molecular weight is preferably from 500 to 1,000,000, more preferably from 2000 to 500,000. And 5000 to 300,000. The molecular weight can be determined by a known method such as GPC.

The polyalkylene carbonate (B) used in the present invention preferably has a glass transition temperature of 40 ° C. or lower. It is preferable that the glass transition temperature is low because flexibility and impact resistance can be imparted to the resin composition. In addition,
In the present invention, the glass transition temperature refers to a temperature observed at a heating rate of 10 ° C./min with a normal DSC (differential scanning calorimeter).

The polyalkylene carbonate (B) used in the present invention may be produced by any method, and is not particularly limited. A typical production method is (1) dimethyl carbonate (2) a method of reacting glycol with phosgene, (3) a method of ring-opening a cyclic carbonate, (4) an epoxide and carbon dioxide gas under a zinc-containing solid catalyst component. (Japanese Patent No. 2,571,269, Japanese Patent No. 2,693,584) and the like, and can be appropriately selected depending on a desired molecular structure and the like.

Resin Composition The resin composition of the present invention comprises (A) a biodegradable polylactic acid-based resin: 30 to 95 parts by weight and (B) a polyalkylene carbonate represented by the above formula (I): 70 to 5 parts by weight (provided that the total of (A) and (B) is 100 parts by weight).

In the resin composition of the present invention,
The polylactic acid-based resin (A) is preferably contained in an amount of 40 to 90 parts by weight, more preferably 45 to 80 parts by weight, and particularly preferably 50 to 70 parts by weight.
In addition, the polyalkylene carbonate (B) is 60 to 1
It is preferably contained in an amount of 0 part by weight, more preferably 55 to 20 parts by weight, particularly preferably 50 to 30 parts by weight.

The resin composition of the present invention comprises (A)
When the polylactic acid-based resin and the (B) polyalkylene carbonate are in such a range, flexibility is imparted without impairing transparency and heat resistance, which are characteristics of polylactic acid, and furthermore, gas barrier properties are improved. Therefore, it is preferable. The resin composition according to the present invention may contain a small amount of a resin other than the components (A) and (B) as long as the object of the present invention is not impaired. It may contain a stabilizer, an ultraviolet absorber, a flame retardant, an internal release agent, a lubricant, a plasticizer, an organic filler, an inorganic filler, a pigment, a pigment dispersant, and the like.

The haze value of such a film comprising the resin composition according to the present invention is at most 40%, preferably at most 30%, more preferably at most 20%, particularly preferably at most 10%. It is. To measure the haze value, the resin composition was thoroughly dried, a predetermined amount was sandwiched between two brass plates, an aluminum plate and a release film, melted at 200 ° C., and compressed at 10 MPa for 1 minute. Again with a compression molding machine set at a temperature of 0 ° C.
A film which was compression-cooled in a and formed into a thickness of 100 μm was used.

The carbon dioxide gas transmission coefficient of the film at 25 ° C. is preferably 85 cc mm / m ² day atm or less, more preferably 80 cc mm / m ² day atm or less, and particularly preferably 75 cc mm / m ^2. It is in the range below day atm. Further, the Young's modulus at 23 ° C. of the sheet comprising the resin composition according to the present invention is preferably 2500 MPa
a or less, more preferably 2200 to 50 MPa
And particularly preferably from 2000 to 100 MPa.

For the measurement of the Young's modulus, the resin composition was thoroughly dried, a predetermined amount was sandwiched between two brass plates, an aluminum plate and a release film, and melted at 200 ° C.
After compression at 1 MPa for 1 minute, the mixture was compressed and cooled again at 10 MPa with a compression molding machine set at a temperature of 0 ° C., and the thickness was 500 μm.
m was used. The resin composition of the present invention,
The production method is not particularly limited, and a known production method for producing a resin composition usually made of a thermoplastic resin can be appropriately employed.

Specifically, for example, the polylactic acid-based resin (A) such as the above-mentioned polylactic acid-based resin and the above-mentioned polyalkylene carbonate (B) are uniformly mixed using a high-speed stirrer or a low-speed stirrer. After that, a method of melt-kneading with a single-screw or multi-screw extruder having sufficient kneading ability can be adopted. Further, for example, a method in which the respective raw materials are mixed in a solid state using a Henschel mixer, a ribbon blender, or the like, or a method in which the polymer is melted and kneaded using an extruder or the like can be used. Moreover,
In a reaction vessel equipped with a decompression device and a stirring device, a method of heating and dissolving and kneading under normal pressure or reduced pressure can be used. Among them, in the present invention, particularly, the raw materials mixed in a solid state are mixed at 180 to 220 ° C. by a twin-screw extruder.
The resin composition prepared by the method of melt-mixing in the above temperature range is preferred.

The resin composition produced by the above method may be in any form such as pellets, rods, powders, etc., but is preferably taken out in the form of pellets. Further, the obtained resin composition can be subjected to solid-phase polymerization. In the solid-phase polymerization, volatile low molecules in the resin composition can be removed and the molecular weight can be improved. As a method of solid-phase polymerization, the pellets of the resin composition that has been sufficiently pre-dried are crystallized by holding them under an inert gas flow such as nitrogen gas at a temperature range of 60 to 120 ° C. for 10 to 180 minutes. And then in the temperature range of 90-150 ° C, 0.5-2.
For 00 hours, it can be carried out by maintaining under an inert gas flow such as nitrogen gas or under reduced pressure.

The resin composition according to the present invention may contain various stabilizers, ultraviolet absorbers, flame retardants, internal mold release agents,
Lubricants, plasticizers, organic fillers, inorganic fillers, pigments, pigment dispersants and the like can be added. By appropriately adding these, molded articles having desired physical properties, films,
Processed products such as sheets, filaments, yarns, and textiles can be manufactured.

Further, when a molded article, a processed article such as a film, a sheet, a filament, a yarn, and a textile obtained from the resin composition of the present invention is heat-treated and / or stretched, high transparency, flexibility and heat resistance are obtained. A high-performance processed product can be obtained. Accordingly, the resin composition of the present invention is preferably used for producing molded products such as films, stretched films (particularly biaxially stretched films), injection molded products, blow molded products, laminates, tapes, nonwoven fabrics, and yarns. Stretching and heat treatment conditions (temperature, temperature change / history, magnification, time, etc.) are not particularly limited as long as a molded article having desired characteristics and properties can be obtained.

The stretching conditions are usually the kind of degradable polymer,
It can be appropriately set in consideration of thermal properties, molecular weight, and the like. The stretching temperature is usually selected from the temperature range of not less than the glass transition temperature of the degradable polymer and not more than the melting point. For example, when the ratio of the polylactic acid-based resin in the resin composition is relatively high, the stretching temperature is usually 60 to 160. ° C, preferably 60-1
It is desirable that the temperature is about 00 ° C. Generally, the stretching ratio is preferably 2 to 20 times, more preferably 4 to 15 times.

The heat treatment temperature is generally selected to be higher than the stretching temperature. For example, when the ratio of the polylactic acid-based resin in the resin composition is relatively high, the temperature is usually from 80 to 16%.
It is desirably 0 ° C, preferably about 120 to 150 ° C. The heat treatment may be a continuous operation or a batch operation. For example, when heat-treating a film obtained from the resin composition of the present invention, the heat treatment conditions are appropriately selected so that the haze (cloudiness) is 10% or less, the elongation is 20% or more, and heating is performed at 120 ° C. for 10 minutes. It is possible to easily produce a high-performance film having a property of not being deformed later. Thus, by heat-treating and / or stretching the film obtained from the resin composition of the present invention, in addition to high transparency and flexibility, it was not possible to obtain a polycaprolactone or polybutylene succinate heat-treated film. Significantly high heat resistance can be provided.

The shape of the resin composition before molding according to the present invention is usually preferably pellets, rods, powders and the like. The resin composition according to the present invention can be homogenized by a mixer and subjected to injection molding, blow molding, compression molding and the like under ordinary molding conditions. Molding of Resin Composition The resin composition according to the present invention is a material suitable for molding such as extrusion molding, injection molding, calender molding, blow molding, balloon molding and the like.

Hereinafter, a method for producing a molded product according to the present invention will be described. (1) Extrusion Molding In extrusion molding, a film or sheet can be molded by molding the resin composition according to the present invention with a general T-die extruder. (2) Injection molding In the injection molding, the resin composition pellets of the present invention are melt-softened and filled in a mold maintained at room temperature or lower (-10 to 20 ° C), and a molding cycle of 20 to 35 seconds. To obtain a molded product. (3) Blow molding (injection blow molding, stretch blow molding,
Direct Blow Molding) For example, in injection blow molding, a preformed body is obtained by melting pellets of the resin composition according to the present invention with a general injection blow molding machine and filling the mold.
After reheating the obtained preformed body in an oven (heating furnace), the preformed body is placed in a mold maintained at room temperature or lower (−10 to 20 ° C.), and blown by sending out pressure air and blowing. Bottles can be molded. (4) Vacuum forming / vacuum pressure forming A film or sheet formed by the same method as the extrusion forming in (1) above is used as a preform. The obtained preformed body is heated and once softened, and then vacuum formed in a mold held at room temperature or lower (−10 to 20 ° C.) using a general vacuum forming machine, or A molded article can be molded by vacuum-pressure molding. (5) Lamination molding In lamination molding, a method of laminating the film or sheet obtained by the extrusion molding method of the above (1) with another base material with an adhesive or heat, or the extrusion molding of the above (1) An extrusion lamination method in which a molten resin is directly extruded from a T-die onto a substrate such as paper, metal, or plastic in the same manner as the above method.
A laminated molded article can be obtained by a method such as a coextrusion method in which the resin composition of the present invention and the like are melted in separate extruders, combined by a die head and simultaneously extruded, or a coextrusion lamination combining these methods. (6) Tape yarn molding In the tape yarn molding, a film or sheet formed by the same method as the extrusion molding in the above (1) is slit into a specific width and uniaxially hot-drawn in a temperature range of 60 ° C to 140 ° C. Then, in some cases, the molded product can be formed by further heat-setting in a temperature range of 80C to 160C. (7) Yarn Forming In yarn forming, a yarn can be obtained by a melt spinning method in which an extruder is used to melt at a temperature of 150 to 220 ° C. and discharge from a spinneret. 60 ° C to 100 if desired
The yarn can be formed by uniaxially heat-drawing in a temperature range of ° C and, in some cases, heat-setting in a temperature range of 80 ° C to 140 ° C. (8) Nonwoven Fabric Molding In the nonwoven fabric molding, a molded article can be molded by a spunbond method or a melt blown method. In the spunbonding method, in the same manner as in the yarn forming of (7) above, melt-spinning is performed through a porous spinneret, and the web is formed by stretching using an air sucker installed under the spinneret. The nonwoven fabric can be obtained by compressing and heat-sealing this with an embossing roll and a smoothing roll. In the melt blown method, the molten resin discharged through a porous spinneret comes into contact with a high-speed heating gas blown from a heating gas outlet to be converted into fine fibers into fibers, which are further deposited on a moving support. By doing so, a nonwoven fabric can be obtained. Uses of Resin Composition The resin composition of the present invention can be molded by the various molding methods described above, and can be suitably used for various applications without any particular limitation. For example, by molding the resin composition of the present invention, members of writing utensils such as ballpoint pens, mechanical pencils and pencils, toothbrushes, stationery members, golf tees, smoked golf ball members for starting ball types, oral medicine capsules, Suppository carrier for anal and vagina, patch for skin and mucous membrane, capsule for pesticides, capsule for fertilizer, capsule for seedling, compost, fishing line spool, fishing float, fishing bait, lure, fishing buoy, hunting It can be suitably used as a decoy for hunting, a hunting shot capsule, camping equipment such as tableware, nails, piles, binding materials, non-slip materials for muddy and snowy roads, blocks and the like.

Further, the resin composition of the present invention comprises a film,
It is a suitable material for producing breathable films and sheets. Films, breathable films or sheets containing the resin composition of the present invention include shopping bags, garbage bags, compost bags, cement bags, fertilizer bags, food / confectionery packaging films, food wrap films, agricultural / horticultural films. ,
Films for greenhouses, films for magnetic tape cassette products such as video and audio, films for flexible disk packaging, fences, oil fences for marine, river, and lakes, adhesive tapes, tapes, binding materials, waterproof sheets,
It can be suitably used as a bulk, tent, sandbag bag, cement bag, fertilizer bag and the like.

A molded product, a film, a breathable film, a sheet, or the like produced from the resin composition of the present invention may be applied to a calendering method, an extrusion method, a screen printing method, a gravure printing method, a letterpress method, an intaglio method, a doctor blade. A publicly known post-treatment step or a finishing step such as a method, a dipping method, a spray method, an air brush method, and an electrostatic coating method can be adopted according to the purpose.

The film or sheet produced from the resin composition of the present invention may be laminated with a sheet of another material, such as paper or another polymer, by lamination or lamination to form a multilayered structure. it can. Furthermore, the resin composition of the present invention has flexibility and can be suitably used as a foam. Foams that can be produced by the resin composition of the present invention include, for example, bento boxes, tableware, containers for lunches and prepared foods sold at convenience stores, cups for cup ramen, and vending machines for drinks. Cups, containers and trays for foodstuffs such as fresh fish, meat, fruits and vegetables, tofu, and prepared foods; containers for dairy products such as torobaco, milk, yogurt, and lactic acid beverages used in the fresh fish market; carbonated beverages and soft drinks , Containers for alcoholic beverages such as beer and whiskey, cosmetic containers, detergent containers, bleach containers, cool boxes, flower pots, tapes, cushioning materials for use in transporting home appliances such as TVs and stereos, Buffer material for use when transporting precision machines such as computers, printers and watches, and for use when transporting optical machines such as cameras, glasses, microscopes, and telescopes.衝材, cushioning material for use in transportation of ceramic products such as glass and ceramics, light shielding materials, heat insulating materials, can be suitably used as a soundproof material or the like.

The foam containing the resin composition of the present invention can be suitably used for medical or sanitary purposes. For example, bandages, carrier for patches for skin and mucous membranes, triangle bandages, plasters, towels, disposable towels, disposable wet towels,
Towels, rags, tissues, cleaning / disinfecting wet tissues, Aka-chan wet wipes, disposable diapers, sanitary and vaginal napkins, sanitary tampons, surgical and delivery blood absorption tampons, hygiene coverstock It can be suitably used for materials, sterilization bags and the like.

These medical or sanitary products are sterilized by heating or steam, sterilized by ethylene oxide gas,
Sterilization with hydrogen peroxide water or ozone, sterilization by irradiation of ultraviolet rays or electromagnetic waves, sterilization by irradiation of radiation such as gamma rays, sterilization and sterilization by known and official methods using sterilizing agents such as ethanol and benzalkonium chloride Alternatively, it can be sterilized and sterilized. Further, by installing the process in a clean bench or a clean room in which ultra-clean air can be supplied in a laminar flow by a HEPA filter, the product can be manufactured and packaged in a sterile state and / or in an endotoxin-free state.

Further, the foam containing the resin composition of the present invention is suitable for general industrial use including agriculture, fishery, forestry, industry, construction and civil engineering, transportation and transportation, and recreation use including leisure and sports. Can be used. For example, agricultural cold gauze, oil absorbing material, soft ground reinforcement, artificial leather, flexible disk lining, sandbag bags, thermal insulation, soundproofing materials, cushioning materials, cushioning materials for furniture such as beds and chairs, cushioning materials for floors It can be suitably used as a packaging material, a binding material, a slippery material for muddy or snowy roads, and the like.

The resin composition of the present invention can have a desired thickness, cross-sectional shape and fineness by appropriately setting the spinning conditions, spinning conditions, knitting conditions, post-processing conditions, dyeing conditions and processing conditions according to the purpose. (Tex, denier, count, etc.), tensile strength and elongation, binding strength, heat resistance, degree of crimp, water absorption,
It can be processed into yarns and textiles having physical properties and characteristics such as oil absorbency, bulkiness, stiffness, and texture.

The yarn obtained by processing the resin composition of the present invention includes monofilaments, multifilaments, staple fibers (staple), tow, high bulk swoof, high bulk tow, spun yarn, blended yarn, processed yarn, false twist yarn, and modified cross-section yarn. , Hollow fibers, conjugate yarns, POY (partially oriented yarn), DTY (stretched processed yarn), POY-DTY, sliver, and the like. Further, the textile obtained by processing the resin composition of the present invention is a woven fabric, a knitted fabric, a nonwoven fabric, a braid including a string or a rope, a fibrous structure such as a high-bulk sliver, a sliver, a porous sponge, a felt, paper, and a net. Includes what is generally recognized as the body.

Accordingly, textiles obtained by processing the resin composition of the present invention include outer garments for general clothing or medical clothing, working clothing, surgical clothing, sleepwear, underwear, underwear, lining, hats, masks, Bandages, slings, socks, women's stockings, women's foundations (bras,
Shorts, etc.), pantyhose, tights, socks, military feet, gloves,
Work gloves, towels, gauze, towels, carpets, mats,
Curtains, wallpapers, clothing core materials, automotive interior materials, mattresses, bags, furoshiki, bedding, futon cotton, pillowcases, blankets, sheets, cold-wear insulation, lace, tape, synthetic or artificial artificial leather, synthetic or artificial It can be suitably used for artificial fur, synthetic or artificial artificial suede, synthetic or artificial artificial leather, mesh pipe and the like.

The textile obtained by processing the resin composition of the present invention can be suitably used for medical or sanitary purposes. For example, surgical sutures, bandages, triangles, bandages, towels, disposable towels, disposable wet towels, roll towels for business, towels, rags, tissues, cleaning and disinfecting wet tissues, Aka-chan wet wipes, disposables Diapers, sanitary cotton, sanitary and vaginal napkins, sanitary tampons,
Underpad, tampon for blood absorption for surgery and childbirth,
It can be suitably used for sanitary cover stocks, sterilization bags, garbage nets, garbage bags, and the like.

These medical or sanitary products can be sterilized, sterilized or disinfected and then aseptically packaged in the same manner as in the foam. Further, the product can be manufactured and packaged in a sterile state and / or in an endotoxin-free state by the same method as in the case of the foam. Further, the textile obtained by processing the resin composition of the present invention is agriculture, fishing, forestry, industry, construction and civil engineering,
It can be suitably used for general industrial use including transport and transportation and recreational use including leisure and sports. For example, agricultural cold gauze, insect repellent bird net, sieve, fishing line, fishing net, cast net, longline, oil absorbent, net,
Rope, sail, sail (canvas), hood, tarpaulin, tycon, container bag, industrial return bag, cement bag,
Fertilizer bag, filter material, water-permeable cloth for landfill construction, soft ground reinforcement cloth, artificial leather, papermaking felt, flexible disk lining, tent, sandbag bag, tree planting net, heat insulation, soundproofing material, light shielding material, impact It can be suitably used as a cushioning material, a cushion material, a binding material, a non-slip material for muddy or snowy roads, a net-shaped pipe, a drainage pipe for civil engineering and construction, and the like.

[0066]

According to the present invention, there is provided an excellent resin composition which is biodegradable, has transparency, flexibility and gas barrier properties, and does not cause bleed-out over time. Can be. Further, the resin composition according to the present invention is excellent in moldability, and can be used by molding into various molded products by various molding methods, and the obtained molded product is used after use. Shows good biodegradability under natural environment when discarded.

[0067]

EXAMPLES Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. The measurement and evaluation of the physical properties of the resin composition and the like were performed according to the following methods. (1) Glass transition temperature (Tg) Measured using a differential scanning calorimeter Pyris-I type (manufactured by PerkinElmer). 10 mg of a sample is weighed into a sample pan from a resin that has been well dried in advance, and the temperature is raised from room temperature to 200 ° C. in a helium atmosphere (temperature rising rate 32
0 ° C./min) and hold at 200 ° C. for 10 minutes.
Rapidly cool to 0 ° C (temperature drop rate 320 ° C / min) and then go to -100
The temperature was kept at 10 ° C. for 10 minutes, and then the measurement was performed in the course of heating up to 200 ° C. (heating rate = 10 ° C./min). The glass transition temperature was determined using the attached analysis software. (2) Transparency (Haze Value) A 100 μm-thick press film obtained by a predetermined method was allowed to stand at 23 ° C. and 50% relative humidity for 3 days, and then a haze meter (Nippon Denshoku Industries Co., Ltd.) Was used to measure the haze. In addition, it turns out that transparency is so excellent that a haze value is small. (3) Flexibility (Young's Modulus) A dumbbell-shaped sample was cut out from a pressed sheet having a thickness of 0.5 mm obtained by a predetermined method and left under a condition of 23 ° C. and a relative humidity of 50% for 3 days. Using a testing machine Instron 4501 (manufactured by Instron), a tensile test was performed at 23 ° C. and a relative humidity of 50% at a strain rate of 100% / min to determine the Young's modulus. In addition, it turns out that flexibility is so large that a Young's modulus is small. (4) Evaluation of heat resistance After molding under predetermined conditions, a strip-shaped sample having a width of 2 mm and a length of 2 cm was cut out from a 100 μm-thick film held at 110 ° C. for 40 minutes, and TMA (Seiko Electronics Co., Ltd. )), A stress of 0.1 MPa is applied thereto, and the temperature is set to 2 ° C./min. The creep test was carried out under the temperature rising conditions described above, and the heat resistance was evaluated at the temperature at which the strain became 10% or more. The evaluation criteria are as follows. ：: Over 140 ° C., Δ: 140 to 90 ° C., ×:
Less than 90 ° C. (5) Gas barrier property (carbon dioxide gas permeability coefficient) For a film having a thickness of 100 μm obtained by a predetermined method,
The carbon dioxide gas permeability was evaluated. The carbon dioxide gas permeability coefficient at 25 ° C. was measured using a gas permeability measuring device GPM-250 (manufactured by GL Sciences). In addition, it turns out that gas barrier property is excellent, so that the value of a transmission coefficient is small. (6) Evaluation of degradability A sheet of 500 μm thickness, 3 cm × 3 cm was prepared, and this was composted at a temperature of 58 ° C. and a moisture content of 60% by weight (components: rice husk,
Garbage, chicken dung, human waste, etc.) and observed for degradability. ○: decomposed within 180 days ×: not decomposed (7) Water vapor barrier property of film The water vapor permeability of a cast film having a thickness of about 20 μm obtained by a predetermined method was measured at 25 ° C. and 100% relative humidity. And a value converted to a value of 90% relative humidity. The smaller the number, the better the water vapor barrier property. (8) Tensile strength, elongation, flexural strength, flexural modulus of dumbbell pieces ASTM D-
790 was evaluated. (9) Drop impact test 800 ml of water was placed in a 1000 ml container obtained by a predetermined method.
The container was filled and dropped on a concrete floor from a height of 1.5 m under the condition of an ambient temperature of 20 ° C., and the number of times until the container was damaged was determined. The number of drops was repeated up to 10 times.

[0068]

Example 1 Polylactic acid (Laitia, H-1 manufactured by Mitsui Chemicals, Inc.)
00) 70 parts by weight and polyethylene carbonate (measured glass transition temperature 13 ° C, weight average molecular weight 151,00
0) 30 parts by weight were charged into a glass reactor equipped with a stirrer and a distillation tube. The distilling tube is connected to a vacuum device including a vacuum pump and a decompression regulator, and has a structure capable of distilling off evaporated substances.

First, the reactor was heated to 120.degree.
, And kept for 4 hours to remove water in the resin. Then, after returning to normal pressure and heating the system to 210 ° C.,
The mixture was mixed for about 1 hour and 30 hours under a nitrogen atmosphere of 50 Torr. Thereafter, the inside of the system was returned to normal pressure, and the resin composition (A1) was taken out. Next, the resin composition (A1) is thoroughly dried, sandwiched between two brass plates, an aluminum plate and a release film by a predetermined amount, melted at 200 ° C., compressed at 10 MPa for 1 minute, and then cooled to 0 ° C. 10M again with the compression molding machine set to
After compression and cooling at Pa, a sheet having a thickness of 0.5 mm and a film having a thickness of 100 μm were formed. The molded sheets and films were evaluated for transparency, flexibility, heat resistance, gas barrier properties, and decomposability. Table 1 shows the results.

[0070]

Example 2 In Example 1, the amount of polylactic acid and polyethylene carbonate was changed to 60 parts by weight of polylactic acid,
A resin composition (A2) was obtained in the same manner as in Example 1, except that the amount of polyethylene carbonate was changed to 40 parts by weight.
Next, this was molded in the same manner as in Example 1 and evaluated.
Table 1 shows the results.

[0071]

Example 3 In Example 1, the amount of polylactic acid and polyethylene carbonate was changed to 50 parts by weight of polylactic acid,
A resin composition (A3) was obtained in the same manner as in Example 1 except that the amount of polyethylene carbonate was changed to 50 parts by weight.
Next, this was molded in the same manner as in Example 1 and evaluated.
Table 1 shows the results.

[0072]

Example 4 In Example 1, the amount of polylactic acid and polyethylene carbonate was changed to 40 parts by weight of polylactic acid,
A resin composition (A4) was obtained in the same manner as in Example 1 except that polyethylene carbonate was used in an amount of 60 parts by weight.
Next, this was molded in the same manner as in Example 1 and evaluated.
Table 1 shows the results.

[0073]

Example 5 70 parts by weight of the same polylactic acid used in Example 1 and 30 parts by weight of the same polyethylene carbonate used in Example 1 were dried in a vacuum dryer at room temperature for 48 hours. Using a Labo Plastomill (manufactured by Toyo Seiki Co., Ltd.) with the cylinder temperature set to 200 ° C., the resin was mixed for 15 minutes to obtain a resin composition (A5). Next, this was molded in the same manner as in Example 1 and evaluated. Table 1 shows the results.

[0074]

[Comparative Example 1] The same polylactic acid 100 used in Example 1
Molding and evaluation were performed in the same manner as in Example 1 using only the parts by weight. Table 1 shows the results.

[0075]

Comparative Example 2 In Example 1, 70 parts by weight of polylactic acid and polycaprolactone (Cell Green RH-7; Daicel Chemical Co., Ltd.) instead of polyethylene carbonate
Was mixed in the same manner as in Example 1 to obtain a resin composition (B1). Next, this was molded in the same manner as in Example 1 and evaluated. Table 1 shows the results. Although excellent in flexibility, it had low transparency and low gas barrier properties.

[0076]

Comparative Example 3 Using only 100 parts by weight of the same polyethylene carbonate used in Example 1, molding was performed in the same manner as in Example 1, and evaluation was performed. Table 1 shows the results.

[0077]

Comparative Example 4 Poly (3-hydroxybutyric acid) (Good Fellow C)
Ambridge) (50 parts by weight) and polyethylene carbonate (50 parts by weight) were dried at room temperature for 48 hours using a vacuum drier, and then a lab plast mill (manufactured by Toyo Seiki Co., Ltd.) was set at a cylinder temperature of 190 ° C. The resin was mixed for 15 minutes to obtain a resin composition, and molded in the same manner as in Example 1.
An evaluation was performed. Table 1 shows the results. The transparency was poor.

[0078]

Comparative Example 5 80 parts by weight of poly (3-hydroxybutyric acid)
Except for using 20 parts by weight of polyethylene carbonate, mixing was performed in the same manner as in Comparative Example 4, and molding and evaluation were performed. Table 1 shows the results. The transparency was poor.

[0079]

Comparative Example 6 100 parts by weight of propiolactone (manufactured by Tokyo Kasei), 0.072 parts by weight of stannous chloride, and 0.78 parts by weight of ethylene glycol were charged into the reaction apparatus used in Example 1, and then fully charged. Then, the mixture was stirred at 140 ° C. for 3 hours under a normal pressure nitrogen atmosphere. 140 ° C, 1 To
Stirring was further performed for 4 hours under reduced pressure of rr to obtain polypropiolactone.

Next, 50 parts by weight of polypropiolactone and 50 parts by weight of polyethylene carbonate were charged into the same apparatus and kept at 120 ° C. under a reduced pressure of 1 Torr for 4 hours to remove water in the resin. Then, return to normal pressure, 2
After the temperature of the system was raised to 00 ° C., it was melt-mixed for 1 hour and 30 minutes under a nitrogen atmosphere of 50 Torr. Thereafter, the pressure in the system was returned to normal pressure, a resin composition was obtained, and molding and evaluation were performed in the same manner as in Example 1. Table 1 shows the results. The transparency was poor.

[0081]

[Table 1]

[0082]

Example 6 80 parts by weight of a sufficiently dried polylactic acid
20 parts by weight of polyethylene carbonate were mixed with a 30 mmφ twin screw extruder (manufactured by Plastics Industrial Research Institute) at a cylinder temperature of 210 ° C. to obtain a resin composition (A6). The same evaluation as in Example 1 was performed. Carried out. Next, the resin composition was kneaded using a 20 mmφ extruder equipped with a T-die at a cylinder temperature of 190 ° C., melted and extruded, and cooled with a roll set at 20 ° C. to cast a cast film having a thickness of 20 μm. Obtained. The moldability was good, and the obtained film was a transparent and flexible film. This film was evaluated for water vapor permeability. Table 2 shows the results
Shown in

[0083]

Examples 7 to 12 Mixing, molding and evaluation were carried out in the same manner as in Example 6 with the amounts shown in Table 2. Table 2 shows the results.

[0084]

Comparative Example 7 Polylactic acid was evaluated in the same manner as in Example 6. The films were harder than those of Examples 7 to 12, and the water vapor barrier properties were inferior to those of Examples.

[0085]

[Table 2]

[0086]

Example 13 The resin composition obtained in Example 6 was thoroughly dried, sandwiched between two brass plates, an aluminum plate and a release film by a predetermined amount, melted at 200 ° C., and compressed at 10 MPa for 1 minute. Thereafter, the sheet was compression-cooled again at 10 MPa by a compression molding machine set at a temperature of 0 ° C. to form a sheet having a thickness of 0.3 mm. Next, the formed sheet is stretched 3 × 3 times after preheating at 80 ° C. for 2 minutes by a film stretching apparatus, and further heat-treated at 80 ° C. for 1 minute to perform a biaxial process with a thickness of about 30 μm. A stretched film was obtained. The film had no unevenness, good stretchability, and the obtained film was transparent. The gas barrier property and the water vapor permeability of this film were evaluated. Table 3 shows the results. Both the gas barrier property and the water vapor barrier property are improved as compared with the values obtained in Example 6.

[0087]

Examples 14 and 15 The resin compositions obtained in Examples 7 and 8 were molded, stretched and evaluated in the same manner as in Example 13. Table 3 shows the results.

[0088]

[Table 3]

[0089]

Example 16 (Injection molding) After sufficiently drying the resin composition obtained in Example 7, using an injection molding machine equipped with a dehumidifying dryer, a cylinder temperature of 140 to 190 ° C and a die temperature of 190 ° C were used. Injection molding was performed in a mold set at 10 ° C. to obtain a molded product of tensile and bent dumbbell pieces. The bending strength of the obtained dumbbell piece is 56 MPa, and the bending elastic modulus is 1900.
MPa, tensile strength was 43 MPa, and elongation was 190%.

[0090]

Example 17 (Paper lamination molding) Obtained in Example 7
After thoroughly drying the resin composition, attach a dehumidifying dryer.
And a T-die with a width of 600 mm and a lip width of 0.8 mm is attached.
Kneading and melting at 200 ° C using the extruder
And kraft paper (with a basis weight of 75 g) at a winding speed of 20 m / min.
/ M ^Two). The film-forming property at this time is
It was good without any.

The thickness of the resin layer of the obtained paper laminate product was 20 ± 2 μm, and the thickness precision was good.

[0092]

Example 18 (Stretch Blow Molding) After sufficiently drying the resin composition obtained in Example 7, the resin composition was melted at a cylinder temperature of 140 to 190 ° C. by an injection stretch blow molding machine.
Injection molding was performed in a mold set at 0 ° C. to obtain a cold parison, weighing 45 g. After the obtained parison was softened by heating to 100 ° C., it was moved into a bottle-shaped mold and 1MP.
a) is blown into it by 3.5 times vertically and 3 times horizontally, and it is 75 mm in diameter, 100 mm in height and 10 in internal volume.
A 00 ml cylindrical bottle was obtained. The wall thickness is 0.2
mm and haze were 2%.

The blow container was filled with 800 ml of water and dropped onto a concrete floor 10 times from a height of 1.5 m at an atmosphere temperature of 20 ° C. As a result, there was no breakage.

[0094]

Example 19 (Spinning (multifilament) molding) After sufficiently drying the resin composition obtained in Example 7, a dry spinning machine equipped with a dehumidifying dryer was used, and the pore system was 0.2 mm and the number of holes was 0.2 mm. It was spun at a temperature of 210 ° C. with a die having 20 pieces to obtain a semi-drawn yarn. The moldability during the molding was good without spinning. The obtained yarn was drawn at a temperature of 80 to 100 ° C and heat-set at a temperature of 120 to 140 ° C. The obtained fiber had a yarn diameter of 5d and a strength of 3.6 ± 0.1 g / d.

[0095]

Example 20 (Tape yarn molding) After sufficiently drying the resin composition obtained in Example 7, a dehumidifying dryer equipped with a die having a width of 600 mm and a lip gap of 0.8 mm was used.
The film was formed at a temperature of 150 to 210 ° C. using an extruder having a thickness of 100 mm to obtain a film having a thickness of 100 μm. Next, the film was slit to a width of 6 mm and stretched 5 times at a temperature of 65 to 80 ° C.
It heat-set at 00-120 degreeC. The resulting tape has a width =
3.5 mm, thickness = 30 μm, strength = 3.9 g / d.

[0096]

Example 21 (Non-woven cloth molding) After sufficiently drying the resin composition obtained in Example 7, the pellets were melted at 210 ° C., and a spinneret having 90 spinning holes with a hole diameter of 0.35 mm was formed. 1300mm from the spinneret surface
The web was formed by taking up using an air sucker installed below and depositing it on a moving collecting surface. The take-off speed at this time was about 3500 m / min.

Next, the obtained web was heated to a temperature of 80 to 100.
The mixture was passed between a metal embossing roll heated to ℃ and a smooth metal roll heated to the same temperature, and was thermally fused to obtain a nonwoven fabric. The short fiber fineness of the obtained nonwoven fabric was 2.5 d, and the basis weight of the nonwoven fabric was 33 g / m ² . 90 times this waste cloth
Heat treatment was performed in an oven at 60 ° C. for 60 seconds, and the shrinkage ratio determined from the dimensional change before and after the treatment was 6.3%.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fuchi term, 580-32, Nagaura, Sodegaura-shi, Chiba Pref. Mitsui Chemicals, Inc. BC07 4J002 CF18W CG01X GA01 GB01 GC00 GG01 GG02

Claims (7)

[Claims] 1. A polylactic acid-based resin having biodegradability (A):
30 to 95 parts by weight and (B) a polyalkylene carbonate represented by the following formula (I): 70 to 5 parts by weight (provided that
(A total of (A) and (B) is 100 parts by weight). When a 0.1 mm-thick press film is formed from the resin composition, the haze value is 40% or less. A resin composition characterized by the following: [R represents an ethylene group, a propylene group and a general formula (II): (However, R ¹ and R ² are the same or different carbon atoms 2
Represents at least one alkylene group, p represents an integer of 1 to 15), m is an integer of 1 to 15, n is 3 ~ 15,0
Represents an integer of 00. ]. 2. The polylactic acid-based resin having biodegradability (A): 40 to 90 parts by weight and the polyalkylene carbonate (B): 60 to 10 parts by weight (provided that the total of (A) and (B) Wherein the haze value is 40% or less when a pressed film having a thickness of 0.1 mm is formed from the resin composition. 2. The resin composition according to 1. 3. The resin composition according to claim 1, wherein the polyalkylene carbonate (B) is a polyethylene carbonate. 4. When a pressed sheet having a thickness of 0.5 mm is formed from the resin composition, its Young's modulus at 23 ° C. is 25%.
The resin composition according to any one of claims 1 to 3, wherein the pressure is not more than 00 MPa. 5. A carbon dioxide gas transmission coefficient at 25 ° C. of not more than 85 cc mm / m ² day atm when a press film having a thickness of 0.1 mm is formed from the resin composition. The resin composition according to any one of claims 1 to 4. 6. A molded article comprising the resin composition according to claim 1. 7. The molded article is a film, a stretched film,
Injection molding, blow molding, laminate, tape, non-woven fabric,
7. A molded product selected from yarn.
The molded article according to the above.