WO2011002148A2 - Film thermorétrécissable et son procédé de fabrication - Google Patents

Film thermorétrécissable et son procédé de fabrication Download PDF

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Publication number
WO2011002148A2
WO2011002148A2 PCT/KR2010/002524 KR2010002524W WO2011002148A2 WO 2011002148 A2 WO2011002148 A2 WO 2011002148A2 KR 2010002524 W KR2010002524 W KR 2010002524W WO 2011002148 A2 WO2011002148 A2 WO 2011002148A2
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Prior art keywords
pet
based film
film
film layer
layer
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PCT/KR2010/002524
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English (en)
Korean (ko)
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WO2011002148A3 (fr
Inventor
오원석
오영택
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동일화학공업 주식회사
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Priority claimed from KR1020090105260A external-priority patent/KR101156607B1/ko
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Publication of WO2011002148A2 publication Critical patent/WO2011002148A2/fr
Publication of WO2011002148A3 publication Critical patent/WO2011002148A3/fr

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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
    • B32B27/06—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating
    • 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
    • B32B2250/03—3 layers
    • 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
    • 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
    • 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
    • B32B2307/514—Oriented
    • 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
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • 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
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • 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
    • B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
    • 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • 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
    • B32B2519/00—Labels, badges
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state

Definitions

  • the present invention relates to a heat shrinkable film used to form a label on the outer circumference of various containers such as plastic containers, glass bottles, aluminum cans, and the like. More specifically, the present invention relates to a heat shrinkable film having a multilayer structure suitable for use as a film for labels of various containers.
  • Heat-shrinkable films are used for labels formed to surround the outer periphery of various synthetic resin containers such as polyester (PET) bottles, glass bottles, and aluminum cans (hereinafter referred to as containers). That is, the necessary content is printed on the heat-shrinkable film for labels, and the printed film is centrally bonded to the container (called tubing or seaming) and attached to the container, and adhered to the outer circumference of the container by applying hot air from the outside to achieve heat shrinkage.
  • PET polyester
  • containers aluminum cans
  • the heat shrinkable film for label attached to the outer circumference of the container by heat shrinkage should satisfy various physical property conditions in consideration of work process, quality or appearance.
  • Such physical properties include heat resistance, printability, adhesiveness, shrinkage, and the like, and all of these properties can be used as labels for labels.
  • PVC films are known to be most suitable as heat shrinkable films for labels.
  • PVC films have been widely used as heat shrinkable films for labels because physical properties such as heat resistance, printability, adhesiveness, and stretchability are suitable for label films.
  • PVC film has a fatal flaw in environmental pollution because it produces environmental hormones. Therefore, Korea and Japan are already legally regulated not to use PVC film for labeling, and other foreign countries are also trying to prevent it from being used by law.
  • PET film and PS film were developed to replace PVC film for labels.
  • PET film and PS film have no environmental pollution problem like PVC film, and there is no problem of recovery or regeneration, but there are not many problems to be overcome for use for label.
  • PET film has good heat resistance, printability and adhesiveness, the specific gravity is about 1.25, which increases the manufacturing cost, and has the drawback that overshrinkage occurs during heat shrinkage. If overshrinkage occurs, the container may be crushed or deformed in the case of plastic containers, not glass bottles or aluminum cans. Since PET film has good heat resistance, it has an advantage that it can be used even when it needs to be sterilized at a high temperature such as fruit juice, usually at 95 ° C.
  • the PS film has good low-temperature shrinkage, a specific gravity of about 1.05, light, and does not cause overshrinkage. Its good low temperature shrinkability makes it suitable for use as labels for containers in dairy products such as milk or yogurt. Since the specific gravity is light, the manufacturing cost can be reduced, and since no shrinkage occurs, the beautiful appearance can be maintained after heat shrinkage.
  • PS film is difficult to print, there is a problem of selecting or developing a good ink for printing. In addition, since the film is difficult to adhere, problems may occur in a tubing (or seaming) process.
  • Korean Patent Laid-Open Publication No. 2005-72756 discloses a heat shrinkable film having a multilayer structure, but technically completely different from a multilayer structure film of a PET film and a PS film like the present invention.
  • the present invention provides a heat-shrinkable film having a three-layer structure formed by forming a PS-based film layer on the intermediate layer and coextruded to form an outer layer, which is a PET-based film layer on each side of the intermediate layer.
  • the stacking of the PS-based film and the PET-based film has been almost impossible in view of the respective physical properties. Since PS and PET do not adhere to each other due to their physical properties, it was almost impossible to stack them together. Attempts have been made to form an adhesive layer therebetween to laminate PS and PET, but these attempts have not been successful for the following reasons.
  • the adhesive layer is formed between the PS and the PET, when the PS forms the intermediate layer and the PET forms the outer layer, three kinds of five-layer structures are formed. That is, it is made of a PET layer, an adhesive layer, a PS layer, an adhesive layer, and a PET layer.
  • Such three-layer five-layer film can be used as a heat shrinkable film, but due to the high manufacturing cost, it is economically impossible to realize, and the three-layer five-layer film has a fatal defect that cannot be recycled. .
  • the present inventors have discovered a new material that can be laminated with each other PS-based film and PET-based film by co-extrusion, and further developed a new adhesive compound that can improve the adhesion of these films to develop the heat shrinkable film of the present invention It was early.
  • An object of the present invention is to form a PS-based film in the intermediate layer, PET film on both sides of the new structure of good printability and adhesion, light specific gravity, good low-temperature shrinkage, no heat shrinkage It is to provide a shrinkable film.
  • Another object of the present invention is to provide a heat-shrinkable film for labeling, which is easy to recover, without causing environmental pollution by using a PS-based material and a PET-based material.
  • Still another object of the present invention is to provide a heat shrinkable film for a label which can be produced without loss in a manufacturing process by forming a PS-based film in an intermediate layer and co-extrusion so that PET-based films are laminated on both sides thereof.
  • the heat-shrinkable film for labels of the present invention is characterized by consisting of an intermediate layer (10) consisting of a PS-based film layer, and a pair of outer layers (20, 30) consisting of a PET-based film layer on both sides of the intermediate layer.
  • the PET film layer is PET-G (glycol modified polyethylene terephthalate) of the following structural formula,
  • the PS-based film layer is a styrene-butadiene block copolymer of the following structural formula:
  • the PS-based film layer and / or PET-based film layer may further include an adhesive compound to improve the adhesion.
  • the adhesive compound is an ethylene-1-butene block copolymer represented by the following structural formula:
  • the PS-based film layer is composed of 70 to 95 parts by weight of styrene-butadiene block copolymer, and 30 to 5 parts by weight of ethylene-1-butene block copolymer, the PET-based film is PET-G Is done.
  • the PS-based film layer may further include 2 to 10 parts by weight of PET-G.
  • the PET-based film layer may further include 5 to 30 parts by weight of ethylene-1-butene block copolymer based on PET-G.
  • the PS-based film layer is made of styrene-butadiene block copolymer
  • the PET-based film layer is 80 to 95 parts by weight of PET-G, and 20 to 5 parts by weight of ethylene-1-butene It consists of a block copolymer.
  • the PS-based film layer 10 has a thickness of 60 to 90%, and the PET-based film layers 20 and 30 each have a thickness of 20 to 5%. It features.
  • the heat shrinkable film of the present invention is prepared by forming a PS-based film on the intermediate layer 10, co-extruding the PET-based film as a pair of outer layers 20 and 30 on both sides thereof, and stretching the co-extruded film. .
  • a PS-based film is formed on an intermediate layer, and a PET-based film is formed on both sides thereof, so that printability and adhesion are good, specific gravity is low, low temperature shrinkage property is good, and no over-shrinkage occurs, and the PS-based material and PET are formed.
  • the use of the system-based material has the effect of providing the heat-shrinkable film for labels that is easy to recover and does not cause environmental pollution problems and is applicable to all containers regardless of the type of container.
  • FIG. 1 is a schematic cross-sectional view of a heat shrinkable film having a three-layer structure according to the present invention.
  • the present invention relates to a heat shrinkable film used to form a label on the outer periphery of various containers such as a synthetic resin container, a glass bottle, an aluminum can, etc., to form a PS-based film in an intermediate layer, and to form a PET-based film on both sides thereof.
  • the present invention relates to a multi-layered heat shrinkable film for labeling, which is produced by coextrusion.
  • FIG. 1 is a schematic enlarged cross-sectional view of a heat shrinkable film having a three-layer structure according to the present invention.
  • the heat shrinkable film for labels is a very thin film having a thickness t of about 40 ⁇ m, but has a structure laminated in three layers in the present invention. It is produced by forming a PS-based film layer on the intermediate layer 10 and co-extruded to form a PET-based film layer with a pair of outer layers 20 and 30 on both sides of the intermediate layer.
  • the PET film layer is PET-G (glycol modified polyethylene terephthalate) of the following structural formula,
  • the PS-based film layer is a styrene-butadiene block copolymer of the following structural formula:
  • the use of PET-G to form the PET film layer and the use of styrene-butadiene block copolymers to form the PS film layer facilitate easy adhesion when they are coextruded to form a laminate structure. To do that. In the case of using pure PET and PS which are not deformed, sufficient adhesion cannot be expected even when coextrusion is performed because of poor adhesion between them.
  • PET-G of the present invention is a polyester-based resin in which EG (ethylene glycol) and TPA (terephthalic acid) form one repeating unit, and CHDM (cyclohexane dimethanol) and TPA form another repeating unit
  • the styrene-butadiene block copolymer is a polystyrene resin in which styrene forms one repeating unit and styrene and butadiene form another repeating unit.
  • PET-G is used to form a PET film layer in the present invention, and a styrene-butadiene block copolymer is used to form a PS film layer
  • a resin serving as an adhesive may be used for stronger adhesion. It may be further included in the PS-based film layer and / or PET-based film layer.
  • Such incorporation of the adhesive resin into the PS-based film layer and / or the PET-based film layer is clearly different from the prior art of forming a separate adhesive layer between the PS layer and the PET layer. Inclusion of an appropriate amount of adhesive resin in the PS-based film layer and / or PET-based film layer is not a problem for recycling at all, and does not increase the manufacturing cost even in the manufacturing process.
  • Preferred resins for the adhesive compound are ethylene-1-butene block copolymers represented by the following structural formula:
  • the adhesive compound is a block copolymer in which ethylene is one repeat unit and 1-butene is another repeat unit.
  • the PS-based film layer is composed of 70 to 95 parts by weight of styrene-butadiene block copolymer, and 30 to 5 parts by weight of ethylene-1-butene block copolymer, wherein the PET-based film is PET It consists of -G.
  • the ethylene-1-butene block copolymer is less than 5 parts by weight in the PS-based film layer, the improved adhesion is insignificant, and when the ethylene-1-butene block copolymer is more than 30 parts by weight, an excessively excessive ethylene-1-butene block copolymer is used. Not desirable
  • the PS-based film layer may further include 2 to 10 parts by weight of PET-G.
  • the inclusion of a small amount of PET-G in the PS-based film layer is not intended to have great meaning, but to improve workability and improve compatibility between polymers.
  • the PET film layer may further include 5 to 30 parts by weight of ethylene-1-butene block copolymer based on PET-G. Since the PS-based film layer already contains 30 to 5 parts by weight of the ethylene-1-butene block copolymer, it is not necessary to again include the block copolymer in the PET-based film layer. However, it can be understood as a concept of dispersing the same amount of the block copolymer in the PET-based film layer and the PS-based film layer. This is because by dispersing the same amount of the block copolymer in the PET film layer and the PS film layer, respectively, the workability can be improved and the compatibility between the polymers can be improved.
  • the PS-based film layer is made of styrene-butadiene block copolymer
  • the PET-based film layer is 80 to 95 parts by weight of PET-G, and 20 to 5 parts by weight of ethylene-1-butene It consists of a block copolymer.
  • the ethylene-1-butene block copolymer is contained only in the PET film layer without being included in the PS film layer.
  • the improved adhesive strength is insignificant, and when the ethylene-1-butene block copolymer is 20 parts by weight or more, excessive ethylene-1-butene block copolymer is unnecessarily used.
  • the PS-based film layer 10 has a thickness of 60 to 90%, and the PET-based film layers 20 and 30 have a thickness of 20 to 5%, respectively. It features.
  • the PET-based film layers each have a thickness of 20% or more, the PS-based film layer becomes relatively thin, so the characteristics of the PS film cannot be utilized, and when the PET-based film layers each have a thickness of less than 5%, the PET-based Since the film layer becomes relatively thin, it is not preferable because the characteristics of the PET film cannot be utilized.
  • the thicknesses of these layers are not necessarily limited thereto, and may be changed according to respective uses and special conditions, and such changes may be easily implemented by those skilled in the art.
  • the heat-shrinkable film having a three-layer structure of the present invention is produced by co-extrusion to form a PS-based film on the intermediate layer and to form a PET-based film on both sides, the excellent low-shrinkability, light specific gravity, overshrinkage of the PS-based film
  • the properties, such as prevention, can be utilized as it is, and the properties, such as favorable heat resistance, printability, and adhesiveness of a PET type film, can also be utilized as it is.
  • the heat shrinkable film of the present invention is prepared by forming a PS-based film on the intermediate layer 10, co-extruding the PET-based film as a pair of outer layers 20 and 30 on both sides thereof, and stretching the co-extruded film. .
  • a technique of forming a PS-based film in the intermediate layer 10 and coextrusion so that a PET-based film, which is a pair of outer layers 20 and 30, on both sides thereof, is already known. It can be easily implemented by those skilled in the art.
  • a technique for producing a heat shrinkable film for labels by stretching the coextruded film as described above is also a known technique.
  • a method for producing a heat shrinkable film for a label by a two-stage stretching method is already patented by the present applicant and disclosed in Patent No. 10-741935.
  • a method for producing a foamable heat shrinkable film by a two-stage stretching method is already filed by the present applicant and disclosed in Patent Application No. 2007-122866.
  • the styrene-butadiene block copolymer, the ethylene-1-butene block copolymer, and PET-G were used in the compositions shown in the following tables. Comparative Examples 1-3 were implemented.
  • the styrene-butadiene block copolymer has the following structural formula and used the product name "CLEARENCE” manufactured by Dengi Chemical Industries, Ltd., Japan (denoted as a block copolymer in the following table):
  • An adhesive compound serving as an adhesive is an ethylene-1-butene block copolymer represented by the following structural formula under the trade name "ADMER” of Mitsui Japan, Japan (in the table below, denoted as adhesive):
  • PET-G is a product of Eastman Kodak, USA, represented by the following structural formula.
  • a three-layer film forming a structure in which a PS-based film and a PET-based film are laminated by co-extruding a heat-shrinkable film having a thickness shown in the table with the composition shown in the table and stretching according to the two-stage tenning method. was prepared.
  • a heat shrinkable film was prepared without using an adhesive, and the remaining Examples 2 to 4 mixed the adhesive with a PS-based film and / or a PET-based film to prepare a film having increased adhesion.
  • the thickness of one PET film layer was 3%, and a lot of defects occurred due to difficulty in workability.
  • Comparative Examples 2 to 3 the thickness of the PET film was excessively thick.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film thermorétrécissable pour étiquettes, comportant une couche centrale (10) formée en tant que couche de film à base de PS, et de deux couches extérieures (20, 30) formées en tant que couches de film à base de PET des deux côtés de la couche centrale. La couche de film à base de PS et/ou la couche de film à base de PET peu(ven)t également contenir un constituant adhésif pour augmenter le pouvoir d'adhésion. Le film thermorétrécissable selon l'invention qui présente une structure triple couche est caractérisé en ce que, respectivement, la couche de film à base de PS (10) occupe 60 à 90% de l'épaisseur totale, et les couches de film à base de PET (20, 30) occupent 20 à 5% de l'épaisseur totale. Le film thermorétrécissable selon l'invention est fabriqué par coextrusion pour empiler les deux couches extérieures (20, 30) qui sont des films à base de PET des deux côtés de la couche centrale (10) sur laquelle est formé le film à base de PS, et par étirage des films coextrudés.
PCT/KR2010/002524 2009-07-01 2010-04-22 Film thermorétrécissable et son procédé de fabrication WO2011002148A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2009-0059726 2009-07-01
KR20090059726 2009-07-01
KR1020090105260A KR101156607B1 (ko) 2009-07-01 2009-11-03 열 수축성 필름 및 그 제조방법
KR10-2009-0105260 2009-11-03

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WO2013163511A1 (fr) * 2012-04-26 2013-10-31 Avery Dennison Corporation Pellicule rétractable
WO2014175527A1 (fr) * 2013-04-25 2014-10-30 동일화학공업 주식회사 Film thermorétractable pour étiquette possédant un faible poids volumique et son procédé de fabrication

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WO2013163511A1 (fr) * 2012-04-26 2013-10-31 Avery Dennison Corporation Pellicule rétractable
WO2014175527A1 (fr) * 2013-04-25 2014-10-30 동일화학공업 주식회사 Film thermorétractable pour étiquette possédant un faible poids volumique et son procédé de fabrication
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