WO2001010928A1 - Biodegradable oriented aromatic polyester film and method of manufacture - Google Patents
Biodegradable oriented aromatic polyester film and method of manufacture Download PDFInfo
- Publication number
- WO2001010928A1 WO2001010928A1 PCT/US2000/021584 US0021584W WO0110928A1 WO 2001010928 A1 WO2001010928 A1 WO 2001010928A1 US 0021584 W US0021584 W US 0021584W WO 0110928 A1 WO0110928 A1 WO 0110928A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- mol
- acid
- aromatic polyester
- glycol
- Prior art date
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Classifications
-
- 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
-
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/688—Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur
- C08G63/6884—Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/6886—Dicarboxylic acids and dihydroxy compounds
-
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—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 relates to a biodegradable oriented aromatic polyester film and a method for manufacturing the film.
- the invention relates more particularly to an oriented aromatic polyester film and its manufacture, which film is biodegradable, transparent and heat-sealable by conventional sealing techniques such as impulse sealing, high-frequency sealing and ultrasonic sealing.
- the film has selectively low moisture vapor transmission, low oxygen or carbon dioxide transmission to meet the requirements of a gas barrier necessary for packaging materials, and is endowed with excellent mechanical strength, making it highly suitable for use in such applications as packaging materials.
- JP-A 6-23836 and JP-A 7-205278 describe biodegradable films and methods for their production, which films are biaxially oriented films produced by melt-extruding a biodegradable polylactic acid polymer as a film then orienting the extruded film.
- Such films have properties similar to those of films endowed with good strength and clarity, such as oriented polypropylene film, oriented polystyrene film and oriented polyethylene terephthalate film.
- Tokuhyo 5-508819 discloses a film of improved properties, including strength, stiffness and clarity, that is formed by extruding a polyhydroxy acid composition, then carrying out stretching treatment to give a biaxially oriented film.
- Films made of ordinary resins such as polyolefin resins, polyamide resins, polyester resins and polyvinyl chloride resins are currently widely used today as packaging materials.
- the relevant properties (e.g., mechanical strength, clarity and gas barrier properties) of the films generally fall somewhat short of the properties of resins that have hitherto been used in packaging materials, such as polyolefin resins, polyamide resins, polyester resins and polyvinyl chloride resins.
- oriented films made of polylactic acid resins have improved strength and clarity. Yet, they continue to lack sufficient stiffness, impact resistance, heat-sealability and gas barrier properties for practical use.
- the melting point is 170°C. Because the temperature difference with the glass transition temperature (about 60°C) and with the crystallization temperature (about 110°C) is small, the allowable range of conditions for carrying out orientation is narrow. Hence, film composed of this type of resin is poorly suitable for orientation.
- Such a film should further have excellent mechanical properties such as strength, stiffness and impact resistance, as exhibited by polyethylene terephthalate.
- Another object of the invention is to provide a method for manufacturing oriented aromatic polyester films which has a broad range of suitable orientation conditions and presents no problem in production of the film.
- an oriented aromatic polyester film having excellent mechanical properties such as strength, stiffness and impact resistance can be obtained by forming a film from a polyester copolymer having repeating units composed of terephthalic acid, a sulfonic acid salt, an aliphatic dicarboxylic acid, ethylene glycol and diethylene glycol, then subjecting the formed film to orientation.
- the invention provides an oriented aromatic polyester film comprising an aromatic polyester copolymer having repeating units comprising an acid component which is about 50 to 90 mol % terephthalic acid, about 0.2 to 6 mol % sulfonic acid metal salt and about 4 to 49.8 mol % aliphatic dicarboxylic acid, and a glycol component which is about 50 to 99.9 mol % ethylene glycol and about 0.1 to 50 mol % diethylene glycol.
- the film has at least one of an impulse seal strength and high-frequency seal strength of at least 3 N/l 5 mm.
- the invention also provide an oriented aromatic polyester film having moisture vapor transmission not greater than 150g/m »d, oxygen transmission not greater than 300 cc/g m •d « atm, carbon dioxide transmission not greater than 1000 cc/g m 2# d»atm. Moreover, the film may be ultrasonically sealable.
- the invention further provides a method for manufacturing an oriented aromatic polyester film having an impulse seal strength and a high-frequency seal strength of at least 3 N/l 5 mm. The method comprises the steps of preparing an aromatic polyester copolymer having repeating units comprising an acid component and a glycol component, wherein the acid component is about 50 to 90 mol % terephthalic acid, about 0.2 to 6 mol % sulfonic acid metal salt and about 4 to
- an oriented aromatic polyester film comprising an aromatic polyester copolymer.
- the copolymer has repeating units comprising an acid component and a glycol component.
- the acid component is about 50 to 90 mol %, and preferably, about 52 to 83 mol %, terephthalic acid.
- the acid component is about 0.2 to 6 mol%, and preferably about 2 to 5 mol%, sulfomc acid metal salt.
- sulfonic acid metal salt include metal salts of 5-sulfoisophthalic acid, metal salts of 4-sulfoisophthalic acid, and metal salts of 4-sulfophthalic acid. Of these, metal salts of 5-sulfoisophthalic acid are preferred.
- metal ions include ions of alkali metals such as sodium, potassium and lithium, or of alkaline earth metals such as magnesium.
- the most preferred sulfonic acid metal salt is the sodium salt of 5-sulfoisophthalic acid.
- the sulfonic acid metal salt is not only relatively expensive, when used in excess it renders the polyester water-soluble and moreover affects physical characteristics such as film shrinkage.
- the sulfonic acid metal salt significantly contributes to the degradability of the resulting film even at a low content of 0.2 mol %.
- the acid component is about 4 to 49.8 mol %, and preferably about 10 to 45 mol %, aliphatic dicarboxylic acid.
- the glass transition temperature cannot be significantly lowered.
- an aliphatic dicarboxylic acid level in excess of 49.8 mol % invites a decline in the glass transition temperature, causing a loss of suitable stiffness in the film.
- the aliphatic dicarboxylic acid preferably has 2 to 18 carbons, and more preferably 2 to 10 carbons. Illustrative examples include azelaic acid, succinic acid, adipic acid, sebacic acid and glutaric acid. Of these, glutaric acid is preferred. Composting that involves the degradation of plastic film is typically carried out under high-temperature, high-humidity conditions. Because this is generally done at a temperature of about 70°C or less, the polyester should have a glass transition temperature (Tg) not higher than preferably about 70°C, and especially about 65°C. In the invention, an aliphatic dicarboxylic acid is used to set the glass transition temperature not higher than about 70°C.
- Tg glass transition temperature
- an aliphatic dicarboxylic acid is used to set the glass transition temperature not higher than about 70°C.
- An ester-forming derivative of the dicarboxylic acid such as the dimethyl ester, may be used in place of the dicarboxylic acid.
- the glycol component is about 50 to 99.9 mol % ethylene glycol and about 0.1 to 50 mol % diethylene glycol, and preferably about 80 to 98 mol % ethylene glycol and about 2 to 20 mol % diethylene glycol. More than 50 mol % of diethylene glycol units adversely influences the mechanical properties of the film, such as the tensile strength, whereas less than 0.1 mol % results in poor degradability.
- the glass transition temperature may be further lowered by substituting up to 20 mol % of the ethylene glycol with another glycol such as triethylene glycol.
- a balanced range of properties can be achieved by preparing the film of the present invention by choosing selected amounts of respective components within the above mol% ranges. If it is desired to enhance the mechanical properties of the film, the amount of terephthalic acid is increased, and if it is desired to enhance biodegradability, the amount of aliphatic dicarboxylic acid is increased, resulting in a lower glass transition temperature (T g ).
- the aromatic polyester polymer used to form the inventive film can generally be prepared by any well-known polymerization method.
- a straight-chain polyester in which the monomer units are randomly distributed along the molecular chain can be prepared by charging a polymerizer with all of the above monomer constituents together with antimony or some other catalyst, and carrying out polycondensation under suitable polycondensation conditions.
- Another method that may be used involves initially reacting two or more of the monomer constituents to prepare a prepolymer, then adding the remaining monomer constituents and polymerizing.
- the aromatic polyester polymer used to form the film of the invention decomposes under the high-humidity, high-temperature conditions typical of composting.
- polyester copolymer that forms the inventive film typically has an intrinsic viscosity within a range of 0.1 to 1.5, and preferably 0.3 to 1.2.
- the oriented aromatic polyester film of the present invention has an impulse strength and a high-frequency seal strength of at least 3 N/l 5 mm.
- "Impulse seal strength” refers to the strength measured by the impulse seal method.
- sealing is effected in a conventional manner by a conventional sealing apparatus.
- the sealing apparatus includes a nichrome wire having a 2 mm width.
- the sealing areas of separate sheets of films are overlapped and pressed with the nichrome wire while a pulsed current is passed through the wire to effect momentary heating and sealing of the film.
- the sealed film is then cut into 15 mm wide strips perpendicular to a seal bar, which is a part sealed in the films.
- the maximum strength of the sealing area is measured by means of a tensile test according to JIS K7127. This value is the impulse seal strength.
- High-frequency sealing is a method for sealing in which the films subjected to sealing are heat-bonded by the heat generated inside the films when such films are placed in a high-frequency electric field. High-frequency sealing is measured by the same tensile test as described for impulse seal strength. "High- frequency seal strength refers” to the strength of the films prepared according to this invention.
- the film of the present invention has a moisture vapor transmission not greater than 150g/m2'd, oxygen transmission not greater than 300 cc/g m 2» d'atm, carbon dioxide transmission not greater than 1000 cc/g m 2, d » atm.
- the film has an ultrasonic seal strength such that it is useful for use a packaging material.
- the oriented aromatic polyester film of the invention is well-suited for use in a range of applications, including agricultural and horticultural supplies such as mulch film for farming and gardening use, seed tape, pesticide bags and composting waste bags; household supplies such as bags for kitchen scraps, water drainage bags, shopping bags, paper cups and paper dishes; business supplies such as coated paper for recycling paper products, printed laminates, card covers, window envelopes, and cover film for printed paper; hygienic supplies such as paper diaper backing sheets, sanitary napkins, disposable gloves and laundry bags; and general packaging applications such as bottles, shrink films for various use, food packaging films and wrapping films.
- agricultural and horticultural supplies such as mulch film for farming and gardening use, seed tape, pesticide bags and composting waste bags
- household supplies such as bags for kitchen scraps, water drainage bags, shopping bags, paper cups and paper dishes
- business supplies such as coated paper for recycling paper products, printed laminates, card covers, window envelopes, and cover film for printed paper
- hygienic supplies such as paper diaper backing sheets, sanitary napkins, disposable
- a method for manufacturing an oriented aromatic polyester film comprises the step of preparing an aromatic polyester copolymer having repeating units comprising an acid component which is about 50 to 90 mol % terephthalic acid, about 0.2 to 6 mol % sulfonic acid metal salt and about 4 to 49.8 mol % aliphatic dicarboxylic acid, and a glycol component which is about 50 to 99.9 mol % ethylene glycol and about 0.1 to 50 mol % diethylene glycol.
- the method further comprises the step of forming an unstretched film using the above aromatic polyester polymer.
- the process of forming the unstretched film involves feeding aromatic polyester polymer-containing flakes to an extruder, melting the flakes, extruding the melt through a film die, then rapidly cooling the extruded material on a chill roll to form an unstretched film having a thickness within a range of about 5 to 300 ⁇ m. The film is then collected on a winding roll. Next, the resulting unstretched film is oriented.
- the film is uniaxially oriented at a fixed width, consecutively biaxially oriented or simultaneously biaxially oriented within a temperature range defined by the glass transition temperature as the lower limit and the crystallization temperature as the upper limit, thereby giving an oriented aromatic polyester film having an impulse seal strength and high-frequency seal strength of at least 3 N/ 15 mm.
- the orientation step is carried out as follows.
- a set of nip rolls comprising a metal roll in association with a rubber roll, vacuum-type suction rolls, or both nip rolls and suction rolls are used as rotating rolls capable of providing the holding strength necessary to restrict the speed of film travel.
- the film that has been rapidly cooled after formation is passed through the rotating rolls at a restricted speed to effect orientation in the machine direction (MD).
- MD machine direction
- the resulting MD-oriented film is introduced onto a tenter frame, both edges of the film in the transverse direction are engaged by tenter grippers, and the film is stretched in the transverse direction (TD) while traveling together with the tenter grippers.
- the film is then heat-treated at a temperature of 120 to 160°C, giving a biaxially oriented polyester film.
- Orientation of the polyester film in the machine direction and the transverse direction may be carried out sequentially in this order or in the opposite order, or may be carried out simultaneously.
- orienting the formed film serves to improve the inadequate film strength of the unstretched film, making it possible to achieve good film strength and clarity.
- Orientation is carried out by suitable selection of the orientation conditions.
- the orientation temperature is set within a range of preferably 40 to 100°C, and more preferably 60 to 80°C.
- the stretch ratio is set within a range of preferably 1.5 to 6.0, and more preferably 2.5 to 6.0. Selecting a suitable stretch ratio is critical for increasing film strength, which is one of the objects of the invention. At a stretch ratio less than 1.5, the film strength is inadequate, whereas a stretch ratio greater than 6 results in a loss in film uniformity. Neither extreme is desirable.
- the film dimensions may be stabilized by administering heat treatment (heat setting). Carrying out heat treatment makes it possible to obtain an oriented film having good heat sealability.
- Biaxial Stretch Formability When a biaxially oriented film was fabricated by carrying out biaxial stretch formation, longitudinal cracking (tearing) of the film during transverse orientation of the film on a tenter frame immediately after orientation in the machine direction was visually examined and rated according to the criteria indicated below.
- the sealing areas of separate sheets of films are overlapped and pressed with the nichrome wire having a 2 mm width while a pulsed current is passed through the wire to effect momentary heating and sealing of the film.
- the sealed film is then cut into 15 mm wide strips perpendicular to a seal bar, which is a part sealed in the films.
- High-Frequency Seal Strength Measured by the high-frequency sealing method.
- the films subjected to sealing are heat-bonded by the heat generated inside the films when such films are placed in a high-frequency electric field. High-frequency sealing is also measured by the tensile test according to JIS K7127.
- Moisture vapor transmission Measured in accordance with JIS K7129 (40°C, 90%RH).
- Test pieces of a given size were placed in soil for 5 months, following which the specimens were visually examined.
- Example 1 Flakes (small particles) of an aromatic polyester copolymer (density,
- the melt was extruded through a T-die and rapidly cooled (to 30°C) on cast rolls to form a 200 ⁇ m thick film.
- the extruded film was oriented in the machine direction at 60°C and a stretch ratio of 3.0 and in the transverse direction at 70°C and a stretch ratio of 4.5, then heat-treated at 150°C for 20 seconds, giving a biaxially oriented aromatic polyester film having a thickness of 18 ⁇ m. Evaluations and measurements were carried out on the resulting film.
- Flakes small particles of a polylactic acid resin (produced by Mitsui Chemicals, Inc. under the trade name designation LACEA H- 100E; density,
- the extruded film was oriented in the machine direction at 65°C and a stretch ratio of 3.0 and in the transverse direction at 70°C and a stretch ratio of 4.5, then heat-treated at 140°C for 20 seconds, giving a biaxially oriented, biodegradable aromatic polyester film having a thickness of 18 ⁇ m.
- Flakes small particles of polyethyleneterephthalate (density, 1.38 g/cm 3 ; melting point, 260°C; melt index at 265°C under 2,160 g of loading, 39 g/10 min) were pre-dried in an oven, then melted in a 60 mm diameter extruder at a cylinder temperature setting of 270 to 300°C. The melt was extruded through a T-die and rapidly cooled (to 30°C) on cast rolls to form a 200 ⁇ m thick film.
- the extruded film was oriented in the machine direction at 80°C and a stretch ratio of 3.0 and in the transverse direction at 90°C and a stretch ratio of 4.5, then heat-treated at 150°C for 20 seconds, giving a biaxially oriented aromatic polyester film having a thickness of 20 ⁇ m. This film was not biodegradable.
- Example 1 On comparing the results obtained in Example 1 using a film according to the invention with the results obtained in Comparative Example 1 using a polylactic acid film, it is apparent that, although both films are biodegradable and have excellent strength, the film in Example 1 has an improved heat sealability, (as measured by heat seal strength) high-frequency sealability (as measured by high frequency seal strength) and ultrasonic sealability (as measured by ultrasonic seal strength) and much improved moisture vapor transmission, oxygen transmission and carbon dioxide transmission. Moreover, the results show that Example 1 has good stretching properties, and thus can be fabricated under a wide range of stretching conditions.
- Example 1 Comparing the results from Example 1 with those from Comparative Example 2, it is found that the film in Example 1 has mechanical properties, optical properties, moisture vapor transmission, oxygen transmission and carbon dioxide transmission which make it useful as a packaging material. In addition, the film has an improved soil degradability, and heat sealability and high-frequency sealability.
- the oriented aromatic polyester films of the invention are biodegradable, transparent, heat-sealable, high-frequency sealable, and ultrasonically sealable.
- the films also have low moisture vapor transmission, low oxygen transmission and low carbon dioxide transmission necessary for use as a packaging material.
- they have excellent mechanical properties such as strength, stiffness and impact resistance. These films thus lend themselves particular well to use as packaging materials.
- the method for manufacturing films of the invention involves the orientation of polyester film having excellent stretchability, and is therefore capable of manufacturing oriented aromatic polyester film under a broader range of orientation conditions than possible with prior-art biodegradable film.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002378230A CA2378230A1 (en) | 1999-08-09 | 2000-08-08 | Biodegradable oriented aromatic polyester film and method of manufacture |
EP00952623A EP1203039A1 (en) | 1999-08-09 | 2000-08-08 | Biodegradable oriented aromatic polyester film and method of manufacture |
AU65286/00A AU781686B2 (en) | 1999-08-09 | 2000-08-08 | Biodegradable oriented aromatic polyester film and method of manufacture |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22566099 | 1999-08-09 | ||
JP11/225660 | 1999-08-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001010928A1 true WO2001010928A1 (en) | 2001-02-15 |
Family
ID=16832788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/021584 WO2001010928A1 (en) | 1999-08-09 | 2000-08-08 | Biodegradable oriented aromatic polyester film and method of manufacture |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1203039A1 (en) |
AU (1) | AU781686B2 (en) |
CA (1) | CA2378230A1 (en) |
WO (1) | WO2001010928A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1297949A1 (en) * | 2001-09-27 | 2003-04-02 | Tohcello Co., Ltd. | A biaxially stretched biodegradable polyester film and a laminated film |
WO2003072631A1 (en) * | 2002-02-26 | 2003-09-04 | Chienna B.V. | Biodegradable polymeric material for biomedical applications |
EP1449867A1 (en) * | 2001-11-01 | 2004-08-25 | Asahi Kasei Life & Living Corporation | Biaxially oriented polylactic acid based resin films |
US7388058B2 (en) | 2002-05-13 | 2008-06-17 | E.I. Du Pont De Nemours And Company | Polyester blend compositions and biodegradable films produced therefrom |
WO2009083771A1 (en) | 2007-12-27 | 2009-07-09 | Polyplex Corporation Limited | Biaxial oriented polyester film and a process for preparing the same |
US20110065893A1 (en) * | 2008-05-16 | 2011-03-17 | Skc Co., Ltd | Heat-shrinkable polyester film |
US8187514B2 (en) | 2002-02-21 | 2012-05-29 | Nissei Company, Ltd. | Biodegradable molded article |
CN103707517A (en) * | 2013-12-27 | 2014-04-09 | 青岛日能拉伸膜科技股份有限公司 | Processing technology specially used for high-brightness two-way stretching polyester film |
CN112955490A (en) * | 2018-09-28 | 2021-06-11 | 尤尼吉可股份有限公司 | Polyester film and process for producing the same |
US12030288B2 (en) | 2018-06-12 | 2024-07-09 | Toyobo Co., Ltd. | Polyester-based film for keeping freshness and packaging bag |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01210423A (en) * | 1988-02-17 | 1989-08-24 | Toray Ind Inc | Polyester film |
WO1992013019A1 (en) * | 1991-01-25 | 1992-08-06 | E.I. Du Pont De Nemours And Company | Novel polyesters and their use in compostable products such as disposable diapers |
US5164248A (en) * | 1988-03-09 | 1992-11-17 | Rhone-Poulenc Chimie | Composite polyester films with improved adhesion and process for obtaining them |
WO1993007199A1 (en) * | 1991-10-01 | 1993-04-15 | E.I. Du Pont De Nemours And Company | Sulfonated polyesters and their use in compostable products such as disposable diapers |
WO1993007198A1 (en) * | 1991-10-01 | 1993-04-15 | E.I. Du Pont De Nemours And Company | Sulfonated polyesters and their use in compostable products such as disposable diapers |
-
2000
- 2000-08-08 WO PCT/US2000/021584 patent/WO2001010928A1/en not_active Application Discontinuation
- 2000-08-08 CA CA002378230A patent/CA2378230A1/en not_active Abandoned
- 2000-08-08 AU AU65286/00A patent/AU781686B2/en not_active Expired
- 2000-08-08 EP EP00952623A patent/EP1203039A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01210423A (en) * | 1988-02-17 | 1989-08-24 | Toray Ind Inc | Polyester film |
US5164248A (en) * | 1988-03-09 | 1992-11-17 | Rhone-Poulenc Chimie | Composite polyester films with improved adhesion and process for obtaining them |
WO1992013019A1 (en) * | 1991-01-25 | 1992-08-06 | E.I. Du Pont De Nemours And Company | Novel polyesters and their use in compostable products such as disposable diapers |
WO1993007199A1 (en) * | 1991-10-01 | 1993-04-15 | E.I. Du Pont De Nemours And Company | Sulfonated polyesters and their use in compostable products such as disposable diapers |
WO1993007198A1 (en) * | 1991-10-01 | 1993-04-15 | E.I. Du Pont De Nemours And Company | Sulfonated polyesters and their use in compostable products such as disposable diapers |
Non-Patent Citations (1)
Title |
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DATABASE WPI Section Ch Week 198940, Derwent World Patents Index; Class A23, AN 1989-288583, XP002149554 * |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1297949A1 (en) * | 2001-09-27 | 2003-04-02 | Tohcello Co., Ltd. | A biaxially stretched biodegradable polyester film and a laminated film |
EP1449867A1 (en) * | 2001-11-01 | 2004-08-25 | Asahi Kasei Life & Living Corporation | Biaxially oriented polylactic acid based resin films |
EP1449867A4 (en) * | 2001-11-01 | 2005-02-09 | Asahi Kasei Life & Living Corp | Biaxially oriented polylactic acid based resin films |
US7175917B2 (en) | 2001-11-01 | 2007-02-13 | Asahi Kasei Life & Living Corporation | Biaxially oriented polylactic acid-based resin films |
US8187514B2 (en) | 2002-02-21 | 2012-05-29 | Nissei Company, Ltd. | Biodegradable molded article |
WO2003072631A1 (en) * | 2002-02-26 | 2003-09-04 | Chienna B.V. | Biodegradable polymeric material for biomedical applications |
US7388058B2 (en) | 2002-05-13 | 2008-06-17 | E.I. Du Pont De Nemours And Company | Polyester blend compositions and biodegradable films produced therefrom |
WO2009083771A1 (en) | 2007-12-27 | 2009-07-09 | Polyplex Corporation Limited | Biaxial oriented polyester film and a process for preparing the same |
US8465842B2 (en) | 2007-12-27 | 2013-06-18 | Polyplex Corporation Limited | Biaxial oriented polyester film and a process for preparing the same |
US20110065893A1 (en) * | 2008-05-16 | 2011-03-17 | Skc Co., Ltd | Heat-shrinkable polyester film |
US8512833B2 (en) * | 2008-05-16 | 2013-08-20 | Skc Co., Ltd | Heat-shrinkable polyester film |
CN103707517A (en) * | 2013-12-27 | 2014-04-09 | 青岛日能拉伸膜科技股份有限公司 | Processing technology specially used for high-brightness two-way stretching polyester film |
US12030288B2 (en) | 2018-06-12 | 2024-07-09 | Toyobo Co., Ltd. | Polyester-based film for keeping freshness and packaging bag |
CN112955490A (en) * | 2018-09-28 | 2021-06-11 | 尤尼吉可股份有限公司 | Polyester film and process for producing the same |
EP3858887A4 (en) * | 2018-09-28 | 2022-06-22 | Unitika Ltd. | Polyester film, and method for manufacturing same |
Also Published As
Publication number | Publication date |
---|---|
EP1203039A1 (en) | 2002-05-08 |
CA2378230A1 (en) | 2001-02-15 |
AU6528600A (en) | 2001-03-05 |
AU781686B2 (en) | 2005-06-09 |
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