WO2005095499A1 - ガスバリア性の改善された透明な生分解性樹脂延伸フィルム及び樹脂製品 - Google Patents
ガスバリア性の改善された透明な生分解性樹脂延伸フィルム及び樹脂製品 Download PDFInfo
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- WO2005095499A1 WO2005095499A1 PCT/JP2005/006011 JP2005006011W WO2005095499A1 WO 2005095499 A1 WO2005095499 A1 WO 2005095499A1 JP 2005006011 W JP2005006011 W JP 2005006011W WO 2005095499 A1 WO2005095499 A1 WO 2005095499A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0059—Degradable
- B29K2995/006—Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2230/00—Compositions for preparing biodegradable polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
Definitions
- the present invention provides a transparent stretched biodegradable resin film which is easy to melt-knead and co-extrud with a heat-sealable biodegradable resin, has improved gas barrier properties, and uses the same.
- Resin products such as packaging films and bags, laminate materials, ostomy bags, etc., especially biodegradable, high compression creep resistance and high pressure resistance, high transparency! It is about wood.
- biodegradable plastics include starch-based polymers, aliphatic polyester resins produced by microorganisms, aliphatic polyester resins produced by chemical synthesis, and their chemical structures.
- materials having good gas barrier properties and transparency include polybutyl alcohol (PVOH) -based resin and polyglycolic acid (PGA) -based resin.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-203036 Discloses a laminate with a thermoplastic biodegradable resin having good heat sealing properties.
- thermoplastic biodegradation with good heat sealing properties Aliphatic polyester resin (eg, polybutylene succinate resin) or aliphatic aromatic polyester resin (eg, poly (butylene terephthalate Z adipate) resin) When these are co-extruded or melt-kneaded, there are problems such as heat deterioration of the heat-sealable biodegradable resin and flow spots. However, it has been difficult to produce biodegradable resin products such as transparent packaging films and bags that have both gas nolia properties and heat sealing properties.
- Patent Document 2 Japanese Patent Application Laid-Open No. 9-111107
- Patent Document 3 Japanese Patent Application Laid-Open No.
- Patent Document 4 Japanese Patent Application Laid-Open No. 2001-114997
- Literature 5 US Pat. No. 5,883,199 discloses a polymer blend and film comprising a polylactic acid-based resin and a polyethylene succinate-based resin. A combination of a specific resin and a draw ratio from a die lip outlet. (Area magnification) to a specific range. Accordingly, what is the Gasunoria resistance than ⁇ alone before mixing is significantly improved also not disclosed, there is a problem of poor transparency.
- Patent Document 6 Japanese Patent Application Laid-Open No. 2000-204142 discloses a molded article containing a polyethylene succinate resin having a gas-nolia property of less than 4000 (cc X ⁇ m) / (m 2 -day atm).
- a gas-nolia property of less than 4000 (cc X ⁇ m) / (m 2 -day atm).
- disclosure regarding mixing with a polylactic acid-based resin is inferior in transparency.
- resin products made of a transparent film having both gas-nolia properties and heat-sealing properties include packaging films and bags, laminated materials for controlling gas permeation, and the like. Bags or pouches used for (ostomy) and Z or perostomy (ostomy) are widely used. Conventionally, these film materials generally have a very good barrier property in a multilayer structure. Since it has a resin layer and contains chlorine, it poses an environmental problem.
- Patent Document 7 Japanese Patent Publication No. 2000-211075 discloses a polybutyl alcohol (PVOH) resin and a melting point Tm of 125.
- a biodegradable co-extruded laminated film of a biodegradable ester-amide copolymer at ° C has been disclosed! / Although, due to the high molding temperature of polyvinyl alcohol-based resin, the biodegradable ester-amide copolymer In some cases, heat deterioration, uneven flow, etc. were caused, making production difficult.
- a resin product having both a gas-nolia property and a heat-sealing property and having a transparent film property it can be stored without using a space before use, and can be easily expanded with a gas such as air when necessary.
- Airbag-type cushioning materials made of film that uses the rebound resilience of compressed gas such as connected continuous sealed airbag cushioning materials and airbag cushioning materials with self-sealing check valves, are used. Recently attracted attention!
- Patent Document 8 Japanese Utility Model Application Laid-Open No. 57-104753 discloses a plastic packaging shock absorber. By connecting and molding hollow units, the units work together as one unit. The purpose is to provide an inexpensive cushioning material that can be obtained with a small amount of raw materials.However, it does not describe the compression creep resistance and pressure resistance strength of the cushioning material, and nothing is disclosed about the material and biodegradable polymer.
- Patent Document 9 Japanese Patent Application Laid-Open No. 4-154570 discloses an air nog cushioning sheet provided with an inflatable and self-sealing type valve.
- Patent document 10 Japanese Patent No. 2670210 discloses an airbag cushioning material that can be inflated into an annular polygonal shape.
- Patent Document 11 Japanese Patent No. 3149130 discloses a connection direction of a large number of continuous airbags. Although an air cushioning material with an opening band attached along is disclosed, an airbag cushioning material using a biodegradable polymer is disclosed.
- Patent Document 1 JP 2004-203036 A
- Patent Document 2 Japanese Patent Application Laid-Open No. 9-111107
- Patent Document 3 Japanese Patent Publication No. 2004-506792
- Patent Document 4 JP 2001-114997 A
- Patent Document 5 U.S. Pat.No. 5,883,199
- Patent Document 6 JP-A-2000-204142
- Patent Document 7 JP-A-2000-211075
- Patent Document 8 Japanese Utility Model Application No. 57-104753
- Patent Document 9 JP-A-4154570
- Patent Document 10 Patent No. 2670210
- Patent Document 11 Patent No. 3149130
- the present invention relates to a transparent stretched biodegradable resin film having improved gas noria properties, which is easily melt-kneaded with a heat-sealable biodegradable resin and coextruded, and a packaging film using the same.
- Resin products such as rubber, bags, laminated materials for controlling gas permeation, ostomy bags, etc., especially airbag cushioning materials with good biodegradability, excellent compression creep resistance and pressure resistance, and excellent transparency
- the purpose is to provide.
- biodegradable resins there is no transparent resin having excellent gas barrier properties that is easy to melt-knead or co-extrud with the biodegradable resin having heat sealing properties, and has pressure resistance during use.
- a resin product whose contents can be checked for example, airbag cushioning material
- a transparent film with high tensile strength and high sealing strength is required.
- a biodegradable stretched resin film that satisfies all of them is required.
- the processing temperature is 230 ° C, which can be melt-mixed with a low melting point thermoplastic biodegradable resin having good seal strength.
- a specific combination of resins and the draw ratio from the die lip outlet within a specific range can improve gas barrier properties more than resin alone before kneading.
- a biodegradable resin stretched film having good Furthermore, as one of the resin products having the stretched film strength, it has a specific oxygen permeability and retains the gas inside even if it is held for a long time under a load, so that the buffering performance is maintained.
- a biodegradable airbag cushioning material using a stretched biodegradable resin with improved transparency which has excellent compression strength and excellent pressure resistance and can maintain a sufficient buffering performance for practical use for a long period of time. Completed the invention.
- the present invention is as follows.
- Polylactic acid-based resin (A) having 50% by weight or more of lactic acid units and 50% by weight or less of the sum of aliphatic dicarboxylic acid units having 2 to 6 carbon atoms and aliphatic glycol units having 2 to 3 carbon atoms
- a film made of a composition (C) with an aliphatic polyester (B) having a melting point Tm (based on jIS-K7121) of 200 ° C or less all of the following formulas (1) and (2) should be satisfied. Characterized biodegradable resin stretched film.
- O is aliphatic polyester (B)
- O is oxygen permeability of composition (C) (actual value)
- Polylactic acid-based resin (A) having 50% by weight or more of lactic acid units and 50% by weight or less of the sum of aliphatic dicarboxylic acid units having 2 to 6 carbon atoms and aliphatic glycol units having 2 to 3 carbon atoms.
- a film having a composition (C) with an aliphatic polyester (B) having a melting point Tm (based on jIS-K7121) of 200 ° C or less satisfies all of the following formulas (3) to (5) Specially A biodegradable resin stretched film that is characteristic.
- O oxygen permeability (actual value) of composition (C), (unit (cc X
- O is the oxygen permeability of the polylactic acid-based resin (A) and O is the aliphatic polyester (B) (unit (
- the final film has a thickness in a range of 1Z200 times or more and 1Z40 times or less with respect to an interval between extrusion die (die lip).
- a biodegradable resin product comprising a film comprising at least one layer of the stretched biodegradable resin film according to 1) or 2).
- Biodegradability according to 6 characterized in that the film has at least one layer having an aliphatic polyester resin having a melting point Tm CFIS-K7121) of not less than 200 ° C and not less than 50% by weight. ⁇ Fat products. 8) in compliance with ASTM D3985, 23 ° C, oxygen permeability was measured under an atmosphere of a relative humidity of 65% or less 250ccZ (m 2 'day atm) , sealing strength was measured according to JIS Z1707 The biodegradable resin product according to 6), wherein the film strength is 15 NZl5 mm or more in both the longitudinal direction (MD direction) and the width direction (TD direction) of the film.
- a multilayer film wherein a seal layer made of a thermoplastic biodegradable resin forms at least one surface of the multilayer film.
- the present invention facilitates co-extrusion and melt kneading with a biodegradable resin having heat sealing properties.
- a biodegradable resin having excellent gas barrier properties can be obtained.
- a biodegradable resin product such as a packaging film, a bag, a laminated material for controlling gas permeation, and an ostomy bag is obtained. Is effective in protecting the natural environment because it can be reduced in volume after use and biodegrades at the time of disposal.In addition, by retaining gas for a long time under load, the buffer performance is improved.
- the airbag cushioning material has excellent compressive creep resistance that lasts, excellent pressure resistance to withstand large loads, and improved transparency that can maintain practically sufficient cushioning performance for a long period of time. It has the effect that it can exhibit stable buffering performance both for storage of relatively heavy objects and for long-term storage.
- the polylactic acid-based resin (A) having 50% by weight or more of lactic acid units used in the present invention is a polylactic acid homopolymer and a copolymer containing 50% by weight or more of lactic acid units,
- the processing temperature is preferably 230 ° from the viewpoint of thermal degradation of the ester bond by lactic acid, which is preferably a homopolymer or a copolymer of lactic acid and a compound selected from the group consisting of hydroxycarboxylic acids and ratatones. Things less than C are preferred.
- the content of the polylactic acid homopolymer and the lactic acid unit is at least 50% by weight, preferably at least 80% by weight, more preferably at least 90% by weight. It is a copolymer or a mixture of those copolymers.
- Lactic acid has two optical isomers, L-lactic acid and D-lactic acid, and the polylactic acid formed by polymerization of these is composed of about 10% by weight or less of D-lactic acid units and about 90% by weight of L-lactic acid units. Or a polylactic acid having L lactic acid units of about 10% by weight or less and D lactic acid units of about 90% by weight or more, and a crystalline polylactic acid having an optical purity of about 80% by weight or more; It is known that there is a polylactic acid having a lactic acid unit of 90% by weight to 10% by weight, and an amorphous polylactic acid having an optical purity of about 80% by weight or less, which is 0% to 90% by weight. .
- Crystalline polylactic acid having an optical purity of 85% by weight or more, or a mixture of crystalline polylactic acid having an optical purity of 85% by weight or more and amorphous polylactic acid having an optical purity of 80% by weight or less is preferable.
- the monomer used as a copolymer component with lactic acid for example, the following can be used.
- the hydroxycarboxylic acid include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, and 6-hydroxycaproic acid.
- examples of the aliphatic cyclic ester include glycolide, lactide, ⁇ -propiolactone, butyrolataton, ⁇ valerolatatone, ⁇ -force prolataton, and ratatones obtained by substituting these with various groups such as a methyl group.
- examples of dicarboxylic acids include succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, terephthalic acid, and isophthalic acid.
- examples of polyhydric alcohols include aromatic polyhydric compounds such as bisphenol / ethylene oxide addition products.
- Alcohols such as ethylene glycol, propylene glycol, butanediol, hexanediol, octanediol, glycerin, sorbitan, trimethylolpropane, neopentyl glycol, diethylene glycol, triethylene glycol, polyethylene glycol, and polypropylene glycol Ether glycol and the like.
- a polymerization method of the polylactic acid-based resin (II) a known method such as a condensation polymerization method or a ring-opening polymerization method can be employed. Further, a method of increasing the molecular weight by using a binder such as polyisocyanate, polyepoxy compound, acid anhydride, polyfunctional acid salt or the like can also be used.
- the weight average molecular weight of the polylactic acid-based resin ( ⁇ ) is preferably in the range of 10,000 to 100,000. When the molecular weight is 10,000 or more, a film having excellent mechanical properties can be obtained. When the molecular weight is 1,000,000 or less, a film having stable physical properties can be obtained with a normal processing machine having a low melt viscosity.
- Polylactic acid-based resin ( ⁇ ) has less than about 4% haze (according to ASTM D1003-95) and gloss (according to ASTM D2457-70) compared to other biodegradable resins. : 45 °) is 130% or more, and the tensile modulus (according to ASTM D882-95a) is about 3 to 5 GPa, which is excellent in transparency, glossiness and rigidity.
- the glass transition temperature Tg is about 60 ° C, which is high among other biodegradable resins, so it is brittle at room temperature (23 ° C), lacks flexibility and flexibility, and has an oxygen permeability O Power 1000
- the aliphatic polyester (B) used in the present invention includes JIS-K6950 (2000), Pio IS-K6951 (2000), Pio IS-K6953 (2000), OECD-301C or ISO-17556. It is preferable that the degree of biodegradation measured based on at least one force is 60% (theoretical value) or more within the period described in each test method, such as oxalic acid, succinic acid, and adipic acid.
- It has at least 50% by weight of the sum of 2 to 6 aliphatic dicarboxylic acid units and aliphatic glycol units having 2 to 3 carbon atoms selected, such as ethylene glycol, propylene glycol, and 1,3-propanediol. It is a crystalline biodegradable polymer having a melting point Tm (according to jIS-K7121) of 200 ° C or less, having a content of 80% by weight or more.
- Tm melting point
- the melting point Tm of the aliphatic polyester (B) (according to jIS-K7121) is easy to melt-knead with a biodegradable resin with good heat sealing properties, co-extrusion processing, etc.
- the temperature is 200 ° C or less because there are no problems such as flow spots and flow spots.
- hydroxycarboxylic acids such as glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, and 6-hydroxycaproic acid, glycolide, lactide, 13-propiolatatone, ⁇ -butyrolataton, ⁇ — Valerolatatatone, ⁇ -force prolatatatone, and aliphatic cyclic ester monomers such as radicans substituted with various groups such as methyl group may be further used as a copolymerization component.
- the preferred aliphatic polyester ( ⁇ ) is a polyethylene succinate-based resin obtained by using succinic acid units and ethylene glycol units as main components (80% by weight or more in total). Particularly preferred examples include polyethylene succinate, and poly (ethylene succinate-adipate) obtained by copolymerizing polyethylene succinate with less than 5% by weight of adipic acid as a third component.
- the stretched biodegradable resin film comprising the composition (C) with the polylactic acid-based resin ( ⁇ ⁇ ) and the aliphatic polyester ( ⁇ ) of the present invention refers to a composition (C ) Oxygen permeability ⁇ mixed
- the gas noriness is smaller than the harmonic mean ⁇ of the oxygen permeability of the polylactic acid-based resin ( ⁇ ) and the aliphatic polyester ( ⁇ ) before joining.
- Aliphatic polyester (B), O is oxygen permeability (actual value) of composition (C), O is oxygen permeability
- the average value is the arithmetic mean (arithmetic mean) calculated by adding all n data and dividing by n, and the geometric mean (geometric mean) calculated by multiplying the n data by the lZn root
- a harmonic mean which is the reciprocal of the arithmetic mean (arithmetic mean) of the reciprocal, and the relationship "arithmetic mean ⁇ geometric mean ⁇ harmonic mean" holds.
- the present inventors surprisingly found that the oxygen permeability of the stretched biodegradable resin film composed of the composition (C) of the present invention, O power, polylactic acid resin (A) and aliphatic polyester (B) oxygen permeability
- a preferable mixed composition ratio X: is 90:10 to 10:90, preferably 90:10 to 25:75.
- the oxygen permeability of the polylactic acid-based resin (A) is 10000 (ccX / ⁇ ) ⁇ ( ⁇ 2 (1 & ⁇ atm) or more 25000 (ccX m) Z (m 2 'day'atm ) Below, the range is 100 (ccX ! 1) 7 (111 2 '(1 & ⁇ &1; 111) or more and 5000 (.0 m) Z (m 2 ' dayatm) or less for aliphatic polyester (B).
- the oxygen permeability of (C) which is a composition of polylactic acid-based resin (A) and aliphatic polyester (B), which is preferred, has better gas barrier properties than (A) and (B) alone. Is 5000 ( Further, when the haze is 40% or less, the transparency shows more excellent performance than (B).
- the composition (C) used in the present invention is prepared by charging a polylactic acid-based resin (A) and an aliphatic polyester (B) into a hopper while weighing them in the same extruder, and directly mixing them. , Weighing and dry blending the raw material into a hopper for molding, or the weighed and mixed raw material is melt-kneaded using a twin-screw extruder, extruded into strands and shaped into pellets. Obtained by the method. Even if the composition (C) is obtained by the method of misalignment, it is necessary to consider the molecular weight reduction due to the decomposition of (C), but it is more preferable to select the latter for uniform mixing.
- the composition of the present invention (C)
- the biodegradable resin product using the stretched biodegradable resinous film is, for example, coextrusion molding including at least one layer of the stretched film. More preferably, a single-layer or multi-layer film obtained by hot-melt molding of an aliphatic polyester resin having a melting point Tm (according to jIS-K7121) of 200 ° C or less is 50% by weight or more. Film having at least one layer.
- packaging films and bags for packaging, transporting and storing various products such as foods and non-foods, laminating materials with a gas permeation control function, etc., ostomy (colostomy) and Z or perostomy ( Used as a medical material such as an ostomy bag used for (artificial cystoplasty), etc., and as a gas-nolia-use material such as an air bag cushioning material with a check valve that allows additional gas injection. Is what is done.
- film for use in biodegradable ⁇ product of the present invention in conformity with ASTM D3985, 23 ° C, relative humidity of 65% oxygen permeability was measured under an atmosphere of 250ccZ (m 2 'day at m) It is preferable that the following! / ,. More preferably 200cc / (m 2 ⁇ dayatm) is less fill-time, more preferably a film of 150ccZ (m 2 'day' atm ) or less, and most preferably rather 120 7 (!!
- the cushioning material has excellent compression creep resistance, and does not release the gas inside even if the airbag is held under load for a long time, and exhibits high damping performance.
- a resin product such as an air bag cushioning material made of a film having an oxygen permeability of 250 ccZ (m 2 'day' at m) or less measured in an atmosphere at 23 ° C and a relative humidity of 65%
- the melting point is required.
- the above-mentioned biodegradable resin composition having improved gas noria property which is easily extruded with co-extrusion with a biodegradable resin having a heat sealing property of 200 ° C. or less.
- a layered silicate such as mica or montmorillonite is nano-dispersed. Polymers and mixtures of these polymers can be used, and by calculating and using the film thickness in accordance with the gas barrier properties of the polymer, a film with the desired oxygen permeability can be obtained. be able to.
- the film used in the biodegradable resin product of the present invention preferably has a seal strength of 15 NZ 15 mm or more in both the MD and TD directions of the film measured in accordance with JIS Z1707. More preferably, the film has a seal strength of 20 NZ15 mm or more in both the MD direction and the TD direction, and still more preferably a film having a seal strength of 25 NZ15 mm or more in both the MD direction and the TD direction.
- airbag cushioning materials that have a film strength of 15 NZ15 mm or more in the MD and TD directions in the MD and TD directions tend to have higher pressure-resistant strength, and are less likely to burst when a large load is applied. Become.
- the tensile strength of the film is increased. 2) A multilayer film having a seal layer. 3) Select a combination of resins with high peel strength between the seal layer and the layer that is in contact with the seal layer. 4)
- the thickness of the seal layer is preferably 4 ⁇ m or more, more preferably 5 ⁇ m or more, and still more preferably 6 ⁇ m or more.
- 5) In the case of a single-layer film, there is a method of forming a polymer blend containing preferably 15% by weight or more of a polymer having a melting point of 140 ° C. or less. Seal strength: Measured by heat sealing under the conditions of a seal pressure of 0.5 MPa and a seal time of 0.2 second according to IS Z1707.
- thermoplastic biodegradable resin having good heat sealability used in the sealing layer of the film used in the biodegradable resin product of the present invention includes thermoplastic starch-based polymers and microorganisms.
- Aliphatic polyester resin chemically synthesized aliphatic polyester resin, a resin partially modified in their chemical structure, biodegradable aliphatic aromatic polyester resin, and the like.
- the resin include a resin obtained by adding a plasticizer to a resin, and a resin mixture obtained by blending these resins.
- it is an amorphous polylactic acid-based resin and a biodegradable polyester other than the polylactic acid-based resin (A) having a glass transition temperature Tg of 10 ° C.
- a glass transition temperature Tg It is a crystalline polymer or an amorphous polymer having a melting point of 140 ° C or less at 10 ° C or less, and more preferably a glass transition temperature Tg of 10 ° C or less and a melting point of 120 ° C or less. It can be a crystalline or amorphous polymer. Particularly preferred examples include polybutylene succinate and poly (butylene succinate). Acrylate, polyethylene succinate, poly (ethylene succinate z adipate), poly (butylene terephthalate Z adipate) and the like.
- the film used for the biodegradable resin product of the present invention preferably has a tensile strength measured in accordance with ASTD D882 of 25 MPa or more in both the MD and TD directions of the film.
- the film is more preferably a film of 30 MPa or more, and still more preferably a film of 35 MPa or more.
- an airbag cushion made of a film having a force of 25 MPa or more in both the MD direction and the TD direction has a low tensile strength, and the film does not break before the sealing portion in the direction, and the pressure resistance tends to be high.
- the film used for the biodegradable resin product of the present invention preferably has a haze of 40% or less as measured according to ASTM D1003. More preferably, the film has a Haze of 30% or less, and still more preferably, the film has a Haze of 20% or less. When the haze is less than 40%, the transparency of the film is high. For example, even if the article protected by the airbag cushioning material is small, the contents can be checked, and the problem of forgetting to remove the article hardly occurs.
- a method of quenching the film during film formation or adding a nucleating agent to minimize the spherulites formed in the film 2) a polymer blend
- a twin-screw extruder with good kneading properties is used to reduce the size of the island domain to 300 to 350 nm, which is less than the wavelength of visible light. It is also possible to use methods such as mixing and kneading, controlling and selecting the viscosity of the polymer to be blended, and using a compatibilizer.
- the film used in the biodegradable resin product of the present invention includes a plasticizer, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antifogging agent, and an antistatic agent in addition to the above resin.
- a known additive such as a water-proofing agent or the like can be blended within a range that does not impair the requirements and characteristics of the present invention.
- a plasticizer or the like as necessary to impart flexibility to the film.
- the plasticizer can be selected from those commonly used in the art, and is added to the resin composition at about 10% by weight. However, those that do not bleed out are preferred.
- aliphatic polycarboxylic acid esters for example, aliphatic polycarboxylic acid esters, fatty acid polyhydric alcohol esters, oxyacid esters, epoxy plasticizers and the like are included. Specific examples include triacetin (TA), tributyrin (TB), butylphthalyl butyl dalicholate (BPBG), tributyl acetyl citrate (ATBC), dioctyl sebacate (DBS), triethylene glycol diacetate, and glycerin ester. Butyl oleate (B0), ether adipic acid esters, epoxidized soybean oil (ESO), and the like.
- TA triacetin
- TB tributyrin
- BPBG butylphthalyl butyl dalicholate
- ATBC tributyl acetyl citrate
- DBS dioctyl sebacate
- B0 butyl oleate
- B0
- the film used for the biodegradable resin product of the present invention is a single-layer or multilayer film.
- the intermediate layer maintains the physical properties of the film by adding an additive that expresses the function only to the surface layer controlled to the minimum necessary thickness.
- a multi-layered film having a high compositional strength since the desired surface characteristics can be imparted while minimizing the change in the physical properties of the film body.
- a layer structure having a layer containing an anti-blocking agent in the surface layer is preferable because blocking and shearing of the resin before stretching and the film after stretching can be prevented, and the processability is improved.
- the raw resin used for the film used in the biodegradable resin product of the present invention is, in addition to the virgin raw material described above, trim scraps and the like generated during the resin film formation and processed again into pellets, or The finely divided recycled material can be used alone or mixed with the virgin material.
- the film forming method of the stretched biodegradable resin film of the present invention may be a method of casting from a T-die onto a cooling roll, a uniaxial stretching method or a simultaneous film forming method such as an inflation method or a tenter method.
- a method of sequentially biaxially stretching Specifically, (1) a method in which an extruded tubular or sheet-like resin is melt-stretched from a molten state by an inflation method or a casting method to form a film, and (2) an extruded tube- or sheet-like resin is formed.
- the film is melt-stretched or stretched in at least one axial direction so that the final film thickness is in the range of 1Z200 to 1Z40 with respect to the distance between the extrusion die (die lip). It is preferable to perform cold stretching.
- a polylactic acid-based resin is used. Extruded in the molten state, and melt-stretched in at least one axial direction so that the thickness of the parison is in the range of 1Z2 to 1Z20 times the gap between the die (die lip) and the area magnification is 2 to 20 times.
- the parison is cold drawn in the MD direction (longitudinal direction of the film) and TD direction (width direction of the film) by 1.5 to 6 times, and finally the thickness of the drawn film with respect to the die lip interval. It is preferable to stretch in at least one axial direction so that the die exit force is in the range of 40 times to 200 times in terms of the area ratio of the die so that the area ratio is 1 to 200 times to 1 to 40 times.
- the area ratio of the film or sheet immediately after the exit of the extrusion die (die lip) Z The ratio of the area of the final stretched film or sheet is referred to as the "area magnification from the die exit."
- the dispersion state of the polylactic acid-based resin (A) and the aliphatic polyester (B) is improved, and the gas barrier properties and transparency are improved.
- the area magnification of the die exit force is 200 times or less, the stretching stability is maintained, and a stable film formation can be performed.
- a preferred production method is an inflation method.
- the advantages of this inflation method are that the equipment cost is relatively low and the operation is easy, the range of applicable resins is wide, it is not suitable for mass production, but it is suitable for medium-scale production and multi-product production.
- a film with a good balance in the longitudinal direction (MD direction) and transverse direction (TD direction) of the film can be obtained.
- TD direction transverse direction
- a seamless bag can be obtained as a packaging bag, and it is convenient only with the bottom seal.It can also be cut into one side to make a wide film, and both ends can be cut into two films. What is possible is that the film width can be changed over a wide range by adjusting the amount of air blow.
- the film forming technique by the tenter method has a point that the thickness unevenness of the film can be reduced and the production amount per unit time can be increased as compared with the inflation method.
- the equipment construction cost is several times more than that of the inflation method, and it is suitable for mass production of small varieties.
- the inflation method becomes economically advantageous.
- the biodegradable polymer as a raw material is set to a predetermined resin composition, a resin temperature, and a resin extrusion amount. Then, the film having the desired thickness is obtained by controlling the amount of air to be injected, the film cooling speed at the die outlet, and the winding speed of the formed film by the rotation speed of the pinch roll.
- the resin composition of each layer and the extrusion speed of an extruder are controlled using a multilayer die to obtain a multilayer film having the desired thickness, composition and layer configuration in the same manner as described above. .
- the final thickness of the film used for the biodegradable resin product of the present invention after formation is preferably 10 to 200 ⁇ m, more preferably 15 to 150 ⁇ m, Particularly preferably, it is 20 to 130 m. If the film thickness is 10 ⁇ m or more, gas retention, sealing strength, compression creep, and pressure resistance are high. When the film thickness is 200 m or less, it is economically advantageous in terms of material cost, and in the case of an airbag cushioning material, flexibility tends to be improved and handling tends to be easy.
- a film used for the biodegradable resin product of the present invention is heat-sealed to form a bag-like material such as an airbag
- heat treatment is performed after film formation so that heat shrinkage does not occur. It is more preferable to perform
- a method if the film is formed by inflation method, after forming the film, the gas is sealed inside, the pressure is maintained, and the film is heated and heat-treated from outside with hot air while keeping the film in tension. Or a method in which the film is cut into a flat film and then passed through a heat treatment zone in a state where both ends are gripped by clips, or a method in which a heat treatment is performed by contacting with a hot roll.
- Preferred heat treatment conditions include a method in which the film is heat-treated for 1 second or more in a temperature range of a glass transition temperature Tg or more and a melting point of Tm or less, and particularly preferably for 2 seconds in a temperature range of Tg + 5 ° C or more and a melting point or less. This is the method of heat treatment.
- heat treatment by relaxing the tension in the TD direction and the Z or MD direction is also effective in reducing the heat shrinkage.
- the film used in the biodegradable resin product of the present invention may be coated with an antistatic agent, a slipping agent, an antiblocking agent, etc., depending on the article to be protected, for example, when used as a buffer. It is preferred to use.
- an antistatic agent, a slipping agent, an antiblocking agent, and the like in order to uniformly apply an antistatic agent, a slipping agent, an antiblocking agent, and the like to the surface of the film, it is preferable that the surface of the film to be coated is subjected to a hydrophilization treatment by corona treatment. By this hydrophilization treatment, the uniformity of the coating film is improved, and the antistatic property and the slip property are efficiently exhibited.
- the surface tension at that time is preferably in the range of 400 ⁇ NZcm to 600 ⁇ NZcm.
- the optical purity of the polylactic acid polymer is calculated by the following formula using the composition ratio of L-lactic acid and Z or D-lactic acid monomer units constituting the polylactic acid polymer.
- composition ratio of monomer units of L-lactic acid and Z or D-lactic acid constituting the polylactic acid polymer is determined by decomposing the sample with 1N-NaOH, neutralizing with 1N-HC1, and adjusting the concentration with distilled water.
- Tosoh's gel permeation chromatography system (GPC: data processing unit, trade name: GPC-8020, detector, trade name: RI-8020), convert to polystyrene using standard polystyrene under the following measurement conditions.
- the weight-average molecular weight Mw was determined by calculation, and the measured value was determined by the arithmetic mean (rounded off) of three points per polymer.
- Tg and Tm were measured with a differential scanning calorimeter (DSC) while the temperature was raised from ⁇ 100 ° C. to 200 ° C.
- DSC differential scanning calorimeter
- the total thickness of the film was measured using a micrometer according to JIS-K-7130, and the thickness of each layer was measured by observing the cross section of the multilayer film with a microscope.
- the oxygen permeability of the film was measured in an atmosphere at 23 ° C and a relative humidity of 65% according to ASTM D3985, and the composition of polylactic acid-based resin (A) and aliphatic polyester (B) was determined as follows: Observed value O and harmonic mean (calculated value) of oxygen permeability of substance (C)
- Seal strength of film ⁇ O According to IS Z1707, seal strength is measured every 10 ° C in a temperature range from 80 ° C to the time when the film melts, with a seal pressure of 0.5MPa and a seal time of 0.2 seconds. The maximum value was taken as the sealing strength of the film.
- the seal bar used was 1Z 2 inches (about 12.7 mm) wide. The seal strength was measured in both the MD direction (film longitudinal direction) and the TD direction (film width direction).
- the bow I tensile strength of the film was measured according to ASTM-D882.
- Bow Tensile breaking strength and bow I tensile yield strength were measured, and the larger dimension was defined as bow I tensile strength.
- a 50 mm square film was cut out from a film sample that had been adjusted in the standard condition (23 ° C 65% RH) (leave it at 23 ° C for 1 week) and then cut out into a 50 mm square film according to ASTM D1003-95.
- the haze (unit:%) was measured under standard conditions using an industrial turbidity meter (Haze meter) (trade name: NDH-1001DP), and the arithmetic mean value of 6 points per type of film (significant figure) (2 digits) was used as the measured value. Evaluation was made according to the following criteria.
- ⁇ Haze ⁇ 40%, a practical level where the presence or absence of an object can be confirmed through a watermark.
- Compression creep (%) ((Interval between upper and lower pressure plates immediately after start of test)-(Interval between upper and lower pressure plates immediately after test start 200 days)) ⁇ (Interval between upper and lower pressure plates immediately after start of test) X 100 Compression creep ( %), The compression creep resistance of the film used was evaluated according to the following criteria.
- A Compressive creep of 25% or less, the most excellent compressive creep resistance, and a level that sufficiently functions as a cushioning material for long-term use and under Z or high load.
- Compressive creep is 36 to 50%, and the compressive creep resistance is slightly inferior. It functions as a cushioning material for long-term use and Z or under high load, but is slightly inferior.
- a load was applied by pressing the pressure plate at a speed of Z minutes, and the load at the time of rupture was measured.
- the results were evaluated according to the following criteria.
- A Film broken with a load of 330 kg or more (bag breaking pressure of 55 N / cm 2 or more)
- the biodegradable stretched resin film (single-layer film) of the present invention was evaluated on the basis of the following criteria based on oxygen transmission rate and haze on three scales of ⁇ , ⁇ , and X.
- the biodegradable resin product of the present invention was evaluated on the basis of the following criteria from A to X based on the evaluation results of the compression creep resistance test and the burst resistance test.
- A Either the compression creep resistance test or the burst resistance test is A and the remainder is A or more. It is excellent as a film for airbag cushioning material for long-term use and Z or under high load.
- B One of the compression creep resistance test and burst resistance test is B and the remainder is B or more, and it is moderately excellent as a film for airbag cushioning material used for long-term use and Z or under high load .
- X Either one or both of the compression creep resistance test and the burst resistance test is X, and there may be problems when used as a film for air bag cushioning material for long-term use and Z or under heavy load. One level.
- the biodegradable polymers used in the following Examples and Comparative Examples are the polymers shown in Table 1, and are polylactic acid manufactured by Shimadzu Corporation, Latati 5000 (trade name), Latati 9030 (trade name), Latati 9800 (trade name). Pionore # 3001 (trade name), a poly (butylene succinate Z adipate) manufactured by Showa Kogyo Co., Ltd., Lunare SE—P5000 (trade name), a poly (ethylene succinate Z adipate) manufactured by Nippon Shokubai Co., Ltd. Lunale SE-P3000D (trade name), a polyethylene succinate manufactured by Nippon Shokubai Co., Ltd., and Ecoflex (trade name), an aliphatic aromatic copolyester manufactured by BASF. These polymers are All are polymers whose biodegradability has already been confirmed. However, the composition of the resin in the present invention is not limited to this!
- Reference Examples 1 to 3 show the results of physical properties when the polylactic acid-based resin (A) and the aliphatic polyester (B) used in the present invention shown in Table 1 were each formed into a single film.
- the polylactic acid shown in Table 1 was used as Latati 5000 (trade name), Latati 9030 (trade name), Latati 9800 (trade name), or polybutylene succinate adjuvant.
- Comparative Example 2 was changed to a single-layer cylindrical die having an outer die lip diameter of 110 mm, an inner die lip diameter of 105 mm, and a lip clearance of 0.8 mm, and was changed to Reference Examples 1-3, Examples 1-3, and Comparative Example 1.
- a monolayer film having the final thickness shown in Table 2 was obtained (the area magnification of the die exit force was about 27 times).
- the evaluation results of oxygen permeability (gas barrier property) and haze (transparency) of the film are shown in the same table.
- Comparative Example 2 which is a region of the prior art (Patent Document 4 and Patent Document 5, etc.), no or low stretch ratio (area ratio from the die exit) as in press molding or injection molding, etc. And the transparency has been improved!
- Example 4 and Comparative Example 3 In Example 4 and Comparative Example 3, in the same manner as in Reference Examples 1 to 3, Examples 1 to 3, and Comparative Example 1, the raw materials shown in Table 1 were used and dried to the compositions shown in Tables 3 to 5. After blending, the extruders of each layer were controlled by a single screw extruder so as to have the compositions shown in Tables 3 to 5, and the molten resin was extruded using a three-layer die. During extrusion, the film was extruded from a three-layer cylindrical die with an outer die lip diameter of 110 mm, an inner die lip diameter of 105 mm, and a lip clearance of 2.5 mm to obtain a film with the final thickness shown in Tables 3 to 5 (from the die exit).
- the area magnification is about 42 ⁇ : LOO times), and the results of evaluating the physical properties of the air nog cushioning material are shown in the table. It can be seen that the biodegradable resin product of the present invention, which is an example, satisfies all of good gas nori properties, strength (compression resistance and burst resistance) and transparency.
- Oxygen permeability: cc, m / (m 2 * day * atm); Harmonic mean: cc * ⁇ rn / im 2 * day * tm> Harmonic mean o H is o ( ⁇ ⁇ ⁇ ⁇ ) / ( ⁇ ⁇ ⁇ ⁇ + ⁇ ⁇ ⁇ ⁇ )
- the transparent biodegradable stretched resin film having improved gas barrier properties of the present invention can be used for, and particularly one of, resin products such as packaging films and bags, laminate materials, ostomy bags and the like.
- Airbag cushioning material is advantageous from the viewpoint of protecting the natural environment because it can not only reduce the volume of the airbag cushioning material when it is disposed of, but also biodegrade, and can be used for a long time under load. It has excellent compressive creep resistance, which maintains buffering performance by retaining gas inside, and has excellent pressure-resistant strength, which can withstand large loads, and is environmentally friendly, capable of sustaining practically sufficient cushioning performance for a long time. It can be suitably used in the field of airbag cushioning materials with good transparency.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Biological Depolymerization Polymers (AREA)
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Description
Claims
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008019418A (ja) * | 2006-06-16 | 2008-01-31 | Unitika Ltd | 生分解性樹脂組成物及びそれを用いた成形体 |
JP2008155432A (ja) * | 2006-12-22 | 2008-07-10 | Dainippon Printing Co Ltd | バリア性を有するヒ−トシ−ル性フィルム |
KR20120001539A (ko) * | 2010-06-29 | 2012-01-04 | 코오롱인더스트리 주식회사 | 수축필름 및 이의 제조방법 |
US8513144B2 (en) | 2007-06-15 | 2013-08-20 | Honeywell International Inc | Property films from renewable polymers |
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- 2005-03-30 JP JP2006511697A patent/JP4836194B2/ja not_active Expired - Fee Related
- 2005-03-30 WO PCT/JP2005/006011 patent/WO2005095499A1/ja active Application Filing
- 2005-03-31 TW TW094110362A patent/TW200604263A/zh unknown
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JPH11302424A (ja) * | 1998-04-27 | 1999-11-02 | Mitsui Chem Inc | 生分解性気泡シート |
JP2001151907A (ja) * | 1999-11-26 | 2001-06-05 | Mitsubishi Plastics Ind Ltd | ポリ乳酸系収縮フィルムまたはシート |
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JP2005047138A (ja) * | 2003-07-28 | 2005-02-24 | Asahi Kasei Life & Living Corp | 生分解性多層フィルム及びそれを用いたエアーバッグ緩衝材 |
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JP2008019418A (ja) * | 2006-06-16 | 2008-01-31 | Unitika Ltd | 生分解性樹脂組成物及びそれを用いた成形体 |
JP2008155432A (ja) * | 2006-12-22 | 2008-07-10 | Dainippon Printing Co Ltd | バリア性を有するヒ−トシ−ル性フィルム |
US8513144B2 (en) | 2007-06-15 | 2013-08-20 | Honeywell International Inc | Property films from renewable polymers |
KR20120001539A (ko) * | 2010-06-29 | 2012-01-04 | 코오롱인더스트리 주식회사 | 수축필름 및 이의 제조방법 |
KR101712177B1 (ko) | 2010-06-29 | 2017-03-07 | 코오롱인더스트리 주식회사 | 수축필름 및 이의 제조방법 |
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JPWO2005095499A1 (ja) | 2008-02-21 |
JP4836194B2 (ja) | 2011-12-14 |
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