WO2006087795A1 - Pellicule en résine polyester facile à déchirer - Google Patents

Pellicule en résine polyester facile à déchirer Download PDF

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Publication number
WO2006087795A1
WO2006087795A1 PCT/JP2005/002544 JP2005002544W WO2006087795A1 WO 2006087795 A1 WO2006087795 A1 WO 2006087795A1 JP 2005002544 W JP2005002544 W JP 2005002544W WO 2006087795 A1 WO2006087795 A1 WO 2006087795A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
polyester resin
polyester
melting point
resin layer
Prior art date
Application number
PCT/JP2005/002544
Other languages
English (en)
Japanese (ja)
Inventor
Kazumoto Imai
Naonobu Oda
Original Assignee
Toyo Boseki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyo Boseki Kabushiki Kaisha filed Critical Toyo Boseki Kabushiki Kaisha
Priority to PCT/JP2005/002544 priority Critical patent/WO2006087795A1/fr
Publication of WO2006087795A1 publication Critical patent/WO2006087795A1/fr

Links

Classifications

    • 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
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • 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
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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

Definitions

  • the present invention relates to a stretched polyester film. More specifically, as a packaging film or tape film that maintains practical properties without losing transparency, heat resistance, barrier properties, etc. and has good tearability, or for PTP packaging and beverages
  • the present invention relates to a stretched polyester film useful as an opening for a pack.
  • cellophane has been known as a film having excellent cutting properties! Cellophane is widely used for various packaging materials and adhesive tapes due to its excellent transparency, easy cutting property, twist fixing property and the like. On the other hand, however, cellophane has a hygroscopic property, and its characteristics fluctuate depending on the season, storage condition, or atmosphere during processing, and it was difficult to always supply a product of a certain quality.
  • packaging bags and adhesive tapes using polyethylene terephthalate as a base film are used because of the excellent properties of stretched polyethylene terephthalate film such as toughness, heat resistance, water resistance, and transparency. Although it has these excellent characteristics, it has the disadvantage that it is difficult to tear the opening of a packaging bag that is difficult to cut and the adhesive tape is difficult to cut.
  • a polyester film oriented in a uniaxial direction is copolymerized with a diethylene glycol component, a low molecular weight polyester resin, or a polyester resin layer (A ) On at least one surface of the polyester resin layer (B) having a melting point higher by 10 ° C or more than the melting point of the polyester resin layer (A) and a thickness of 5% or more and 60% or less of the total thickness.
  • the laminated unstretched laminated film is heat-treated at least at a temperature lower than the melting point of the polyester resin layer (A) by at least 10 ° C. after the axial extension and at a temperature lower than the melting point of the polyester resin layer (B).
  • a method for producing a polyester film having good tearability and twistability has been proposed. (See Patent Document 1-14)
  • Patent Document 1 Japanese Patent Publication No. 55-8551
  • Patent Document 2 Japanese Patent Publication No. 56-50692
  • Patent Document 3 Japanese Patent Publication No. 55-20514
  • Patent Document 4 JP-A-5-104618
  • the method of stretching in the uniaxial direction in the above-described prior art is a method of easily cutting linearly in the alignment direction but difficult to cut in directions other than the alignment direction, and copolymerizing a large amount of diethylene glycol components and the like.
  • the method using low molecular weight polyester resin has been practically powerful because it easily causes troubles of film breakage in the stretching process.
  • the polyester resin layer (A) has a melting point higher by 10 ° C or more than the melting point of the polyester resin layer (A), and 5% or more and 60% or less of the total thickness.
  • the polyester resin layer (B) is 10 ° C. lower than the melting point of the polyester resin layer (A) at least after the unstretched laminated film having the polyester resin layer (B) having a thickness of at least uniaxially stretched.
  • the polyester resin layer (A) is brittle due to the progress of crystallization over time, and the film characteristics may change immediately after film formation and during processing. In this case, there was a failure in that the tension fluctuation during processing was broken when changing.
  • the present invention has been made against the background of the problems of the prior art, and has excellent properties of a polyester film, such as heat resistance, cold resistance, moisture resistance, transparency, fragrance retention, and easy-to-cut properties.
  • a polyester film such as heat resistance, cold resistance, moisture resistance, transparency, fragrance retention, and easy-to-cut properties.
  • tension fluctuation during processing is difficult to break when changing.
  • the present invention is a polyester film in which two or more types of polyester resin layers having different melting points are laminated, and the piercing strength is 8. ON or less and the previous A polyester-based resin film with good bow I tearability, characterized in that the tensile elongation at break in the longitudinal direction of the film is 50% or more.
  • a polyester resin layer having a melting point higher by 10 ° C. or more than the melting point of the polyester resin layer is laminated on at least one surface of the polyester resin layer, and at least uniaxial It is preferable to be stretched.
  • the polyester-based resin film according to the present invention can produce a film having excellent heat resistance, cold resistance, moisture resistance, transparency, fragrance retention, etc. and having stable and easy-cutting properties at low cost. Has the advantage.
  • the polyester resin film in the present invention is a polyester film composed of two or more polyester resin layers having different melting points, and the polyester resin layer used in each layer is crystalline. It is selected from polyester resin or amorphous polyester resin.
  • polyester resin having a higher melting point polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or a copolymer containing these constituents as main components can be used.
  • a polyester comprising terephthalic acid as the main acid component and ethylene glycol as the main alcohol component, and more preferably a polyester comprising 95 mol% or more of terephthalic acid and 95 mol% or more of ethylene glycol.
  • the intrinsic viscosity of the above-mentioned polyethylene terephthalate! /, A copolymer mainly composed of these components, is preferably 0.55-1.3 dlZg, more preferably 0.6 0-0. 74 dlZg, particularly preferably 0.60-0.65 dlZg.
  • the polyester resin having a lower melting point includes terephthalic acid isophthalic acid-ethylene glycol copolymer, terephthalic acid ethylene glycol-neopentylglycol.
  • Polyesters containing terephthalic acid and ethylene glycol as the main components, such as a copper copolymer, and other acid components and Z or other darlicol components as copolymerization components are preferred.
  • Other acid components include aliphatic dibasic acids (eg, adipic acid, sebacic acid, azelaic acid) and aromatic dibasic acids (eg, isophthalic acid, diphenyldicarboxylic acid, 5-tert-butyl).
  • glycol component examples include aliphatic diols (for example, neopentinoglycolanol, diethylene glycol, propylene glycol, butanediol, hexanediol), alicyclic diols (for example, 1,4-cyclohexanedimethanol) or aromatics.
  • Diols for example, xylylene glycol, bis (4-j8-hydroxyphenyl) sulfone, 2,2- (4-hydroxyphenol) propane derivatives
  • the intrinsic viscosity of the copolyester is preferably 0.70-080 dlZg.
  • polyester resin layers having different melting points selected from these are laminated.
  • the layer structure of the film of the present invention is the best in the laminated structure of a layer having a high melting point and a layer having a low melting point due to film forming properties such as fusion and adhesion in the film stretching step. It is preferable that both outer layers have a high melting point.
  • the polyester resin layer of the present invention preferably has a difference in melting point of 10 ° C or more between the layer having the highest melting point and the layer having the lowest melting point, more preferably 20 °. C or higher.
  • the heat setting temperature is limited to the melting point or less of the polyester resin layer having a high melting point, if the polyester resin layer has a low melting point, sufficient heat setting cannot be performed, and the heat shrinkage rate is reduced. Is unfavorable because it increases. Therefore, polyethylene terephthalate or polyethylene naphthalate is preferred for the high melting point polyester resin layer!
  • the puncture strength is preferably 8. ON or less, more preferably 6.0. N or less, more preferably 5. ON or less. If the piercing strength exceeds 8. ON, the strength of the film will increase and it will not be possible to tear it by hand.
  • the breaking elongation in the longitudinal direction is preferably 20% or more, more preferably 50% or more. If the elongation at break is less than 20%, there is a risk of breaking due to a change in tension during processing, making stable processing difficult.
  • an elastomer component to the layer on the low melting point side so that the elongation at break in the longitudinal direction is 50% or more.
  • the elastomer component Polyolefins such as polypropylene and polyethylene that have a glass transition temperature of 20 ° C or less, polyesters that are copolymerized with polytetramethylene glycol, and the like, are copolymers of polybutylene terephthalate and polytetramethylene glycol. Is preferred.
  • the elastomer component is contained in the lower melting point layer at 1 to 5% by weight, and preferably 1 to 3% by weight!
  • the stretched film has a thickness of 9 ⁇ m force or 40 ⁇ m, but is not particularly limited.
  • the polyester film of the present invention may be added with various known additives such as a lubricant, a pigment, an antioxidant, an antistatic agent and the like within a range not inhibiting the effects of the present invention. .
  • the resin used for the polyester resin layer (A) on the side having the high and melting point and the polyester resin layer (B) having the low and melting point were prepared, respectively, and each was supplied to another two extruders. Supply, melt and extrude at temperatures above their melting points, pass through the composite adapter, and extrude from the die as a 2 type 3 layer (AZBZA), solidify by cooling, and form an unstretched laminated film.
  • AZBZA 2 type 3 layer
  • the unstretched laminated film includes a method of forming an unstretched film by extrusion from a die outlet in a state of being laminated by a coextrusion method.
  • a method of laminating unstretched films which are melted separately at a temperature equal to or higher than the melting point in a plurality of extruders and formed by extruding a die outlet force in a heated state.
  • the unstretched laminated film thus obtained is subjected to -axial stretching at a temperature not lower than the glass transition temperature of the polyester resin layer (A) and not higher than the melting point of the polyester resin layer (B). At this time The draw ratio is 2 to 30 times, preferably 9 to 16 times in terms of stretch area.
  • the stretching method may be sequential biaxial stretching or simultaneous biaxial stretching.
  • the laminated film thus obtained is heat-set at a temperature not lower than 5 ° C of the polyester resin layer (B) and lower than the melting point of the polyester resin layer (A).
  • the presence of the layer in which the molecular orientation has disappeared and the layer in which the molecular orientation has been maintained make it possible to achieve both the strength of the film and the easy-cut property, and the state of the layer configuration and heat setting. It is possible to control hand cutting by controlling.
  • JIS K 7127 “Plastic film and sheet after standing in a 50 ° C atmosphere for 3 days Measured according to “Tensile test method”.
  • Polyester resin (A) with an intrinsic viscosity of 0.62 dlZg was melted by a separate extruder at a temperature of 285 ° C. The melt was joined by a composite adapter, then extruded from a T die, and cooled by a cooling drum. Quenched to obtain a three-layer unstretched laminated film (AZBZA)
  • the unstretched laminated film was first stretched 3.8 times in the longitudinal direction at 95 ° C, then 4.0 times in the transverse direction at 110 ° C, and then relaxed by 3% and then at 220 ° C.
  • the film was heat-treated at a temperature to obtain a 16 ⁇ m film having a total thickness of layer A of 3.0 ⁇ m.
  • the obtained film had a puncture strength of 4.5 N, and was excellent in hand cutting. Table 1 shows the characteristics.
  • a film having a thickness of 16 ⁇ m was obtained by changing the total thickness of the layer A to 8 ⁇ m using the same raw materials and method as in Example 1.
  • the film obtained had a pin puncture strength of 7.2 N and excellent hand cutting properties. Table 1 shows the characteristics.
  • Example 2 Using the same raw materials and method as in Example 1, a 16 ⁇ m film was obtained in which only the thickness of layer A was changed to 12 ⁇ m. The puncture strength of the film obtained by force was 8.5 N, which was inferior to hand cutting.
  • the total thickness of the layer A was 8 ⁇ m in the same manner as in Example 1 except that the polyester resins (A) and (B) of Example 1 had the intrinsic viscosities of 0.74 and 0.76 dl / g, respectively. A 16 ⁇ m film was obtained. The puncture strength of the film obtained by caulking was 9.5 N, which was inferior to hand cutting.
  • Example 3 The same as in Example 1, except that the polyester resin layer (A) and (B) was a polyester resin having an ethylene glycol terephthalate melting point of 265 ° C and an intrinsic viscosity of 0.62 dlZg. A 16 m film was obtained. The film obtained by strengthening had a puncture strength of 10.5 N and was inferior to hand cutting.
  • polyester resin layer (B) was made of terephthalic acid, isophthalic acid-ethylene glycol, having a melting point of 221 ° C and an intrinsic viscosity of 0.664 dlZg. m films were obtained.
  • the obtained film had a significantly reduced breaking strength after being left in an atmosphere of 50 ° C.
  • Table 1 shows the evaluation results of the films obtained in Example 12 and Comparative Example 14.
  • the piercing strength is 8. ON or less, comprising a polyester film in which two or more polyester resin layers having different melting points are laminated. It can be seen that a certain polyester-based resin film has excellent hand cutting properties.
  • the polyester-based resin film of the present invention has excellent hand cutting properties, and can be used in a wide range of fields as a packaging film or tape film, or as an opening for PTP packaging or beverage packs. Can contribute to the industry.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

L’invention concerne une façon peu coûteuse d’obtenir une pellicule en polyester extensible qui peut être déchirée de façon satisfaisante sans perdre de force, de transparence, de résistance thermique, de propriétés de barrière, etc., et qui est utile comme pellicule d’emballage ou pellicule pour utilisation sous forme de ruban ou comme matériau d’ouverture dans un emballage point à point ou dans un emballage pour boisson. La présente invention concerne une pellicule de résine polyester facile à déchirer qui comprend deux couches de résine polyester superposées ou plus avec des points de fusion différents, et qui est caractérisée par une résistance au percement de 8,0 N ou moins.
PCT/JP2005/002544 2005-02-18 2005-02-18 Pellicule en résine polyester facile à déchirer WO2006087795A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/002544 WO2006087795A1 (fr) 2005-02-18 2005-02-18 Pellicule en résine polyester facile à déchirer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/002544 WO2006087795A1 (fr) 2005-02-18 2005-02-18 Pellicule en résine polyester facile à déchirer

Publications (1)

Publication Number Publication Date
WO2006087795A1 true WO2006087795A1 (fr) 2006-08-24

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05104618A (ja) * 1991-10-17 1993-04-27 Toyobo Co Ltd 引き裂き性とひねり性の良好なポリエステルフイルムの製造方法
WO1994029374A1 (fr) * 1993-06-10 1994-12-22 Nkk Corporation Film constitue d'une resine polyethylene- 2,6-naphtalate, procede de production d'un tel film, et enveloppement realise au moyen dudit film
JP2002337290A (ja) * 2001-05-16 2002-11-27 Toyobo Co Ltd 積層ポリエステルフィルム
JP2002337285A (ja) * 2001-05-16 2002-11-27 Toyobo Co Ltd 積層ポリエステルフィルム
JP2003311906A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム
JP2003311905A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム
JP2003311904A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム及び、その製造方法
JP2004098571A (ja) * 2002-09-11 2004-04-02 Toyobo Co Ltd ポリエステル系フィルム及びその製造方法
JP2004358798A (ja) * 2003-06-04 2004-12-24 Unitika Ltd 易切断性に優れた積層二軸延伸ポリエステルフィルム

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05104618A (ja) * 1991-10-17 1993-04-27 Toyobo Co Ltd 引き裂き性とひねり性の良好なポリエステルフイルムの製造方法
WO1994029374A1 (fr) * 1993-06-10 1994-12-22 Nkk Corporation Film constitue d'une resine polyethylene- 2,6-naphtalate, procede de production d'un tel film, et enveloppement realise au moyen dudit film
JP2002337290A (ja) * 2001-05-16 2002-11-27 Toyobo Co Ltd 積層ポリエステルフィルム
JP2002337285A (ja) * 2001-05-16 2002-11-27 Toyobo Co Ltd 積層ポリエステルフィルム
JP2003311906A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム
JP2003311905A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム
JP2003311904A (ja) * 2002-04-24 2003-11-06 Toyobo Co Ltd 延伸ポリエステルフィルム及び、その製造方法
JP2004098571A (ja) * 2002-09-11 2004-04-02 Toyobo Co Ltd ポリエステル系フィルム及びその製造方法
JP2004358798A (ja) * 2003-06-04 2004-12-24 Unitika Ltd 易切断性に優れた積層二軸延伸ポリエステルフィルム

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