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
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins

Definitions

• the invention relates to composite films for packaging, and more particularly, to isotactic polybutene-based homopolymers or copolymers, and propylene-based homopolymers. Or, the laminate with the copolymer is stretched at least in the uniaxial direction, so that the properties required as a packaging film, particularly, flexibility and punch hole strength are excellent. This is related to a composite film.
• Films for packaging are required to have many properties such as transparency, tensile strength, anti-blocking properties, flexibility, and punch-hole strength.
• properties and punch hole strength have recently become particularly severe.
• “flexibility” becomes an essential requirement in order to adapt to all such products and packaging forms. In the case of remote transport, prevent the film from breaking during transportation.
• Polyvinyl alcohol film has excellent transparency, antistatic properties, and flexibility, but is vulnerable to changes in humidity and loses flexibility during the dry season. There is a serious problem. Only i s has a surface on the film surface.
• the inventor and the like have noticed the above circumstances, and in particular, have developed a film with excellent flexibility, close-packing properties, and punch hole strength.
• the invention was completed as a result of this research, and its composition was isotactic polyrib with a butene content of 60 to] 100 weight.
• [Propylene] whose propylene content is 70 to 100% by weight on one side or both sides of a base layer made of a tenth-type homopolymer or a copolymer
• the gist is that a film made of a homopolymer or a copolymer is laminated, and the thickness of the base layer occupies 50 or more of the total thickness.
• the base ⁇ of the composite film according to the present invention is an isotactic polybutene] -based homopolymer or copolymer having a butene content of 60% by weight or more. It must be a thing.
• the reason is that, when the butene content is less than 60% by weight, the flexibility as a base layer becomes poor, and the change in flexibility due to the difference in temperature is remarkable. The transparency of the system becomes poor.
• the most common copolymer component is a olefin (C2-Cio, excluding C4) which is not copolymerizable with butene-11.
• the copolymer may be in the form of a random copolymer or a block copolymer, but the random copolymer is the most suitable for increasing the transparency.
• Block copolymers are preferred in order to increase the cross-hole strength, and the material constituting the base layer has a butene content of 6%.
• the base layer must have a wall thickness that is 50 times higher than the total film thickness. No, but replace With the strength of less than 5 o%, the above-mentioned 3 ⁇ 4m characteristic's flexibility is not fully exerted and the purpose is achieved. Will no longer work.
• the propylene homo- or copolymer laminated on one or both sides of the base layer gives the composite film an extensibility, and mainly increases punch hole strength. It is extremely important for raising. Immediately, as described above, it is extremely difficult to perform stretching treatment with Isotactic Polybutene 1-based polymer, and it is difficult to carry out stretching by stretching. It is an unforeseen force to improve the strength of the tie-hole. If a propylene-based polymer film is laminated on this, the entire composite film can be stretched, and Thus, the punch hole strength can be increased. However, since the surface of the composite film is covered with a non-sticky propylene polymer film, the problem of blocking is also eliminated. Be done.
• propylene-based polymer As such a propylene-based polymer that can be used for this purpose, there is a propylene homopolymer, and propylene and ethylene, butene, and propylene.
• One-year-old fins such as xen (preferably C 2 to C lO, except for C 3 except that the copolymer with 5 is used. It is composed of two or more monomats with a propylene content of at least 70% by weight.
• the propylene copolymer may be either a random copolymer or a block copolymer, but the random copolymer and the block copolymer may be used to enhance transparency. Polymers are optimal.
• the choice of isotactic polybutene-1) -based polymer and propylene-based polymer should be optimized according to the physical properties of the mating materials to be combined. It should be decided by selecting the material, but when the selection criteria were also examined, it is most practical to decide based on the difference between the melting points of the two materials. High quality composite fibers can be obtained by selecting a material whose main polymer forming the base layer has a lower melting point in the range of 5 to 50 ° C than the melting point of the surface layer. It turns out that we can get Lum and power s'.
• the composite film as described above can be manufactured, for example, by the following method.
• the base layer and the coating layer are individually melt extruded and then melted. m layers, or melt extruding the base ⁇ onto a pre-manufactured coating film! And cool and solidify.
• the solidification temperature depends on the melting point of the material. 0 0. C (preferably about 20 to 70 ° C) is common.
• the film of the present invention in a non-stretched state can be obtained by such a method.
• the above-mentioned non-stretched film can be stretched at least uniaxially to obtain a stretched composite film. That is,
• the unstretched composite film obtained above is then stretched in at least one axis direction (preferably, two axis directions) by a conventional method.
• Stretch ratio, etc. particularly LIMITED Lena Iga, to Ru is Nono 0 down Chi halls strength improving effect significantly calling the volatilizing is longitudinally from 1.5 to 2 0 times in the transverse direction 1. 5 to] 6 times, and the optimal stretching temperature in this case is 30 to in the case of longitudinal stretching.
• This composite phenol is only stretched in the axial direction (generally 60 to 60). ⁇
• the unstretched or stretched film obtained as described above may be rolled as it is and then commercialized, or it may be necessary.] 0 to 50 ° C Aging treatment, and also corona discharge treatment, electron beam treatment, flame treatment, etc.
• the non-invention is composed as outlined above, and a flexible, isotactic polybutene-based polymer film is provided on one or both sides of the polymer film.
• a flexible, isotactic polybutene-based polymer film is provided on one or both sides of the polymer film.
• No. 1 Practical use is impossible due to visible unevenness and ripples on the entire surface
• a five-dew ⁇ moss larvae are excised on a fisolem, and the breaking strength is measured when hooks are hooked into these holes and pulled.
• Isotactic polybutene-1) Ethylene copolymer [ethylene content: 3.5 weight J80 weight 5 ⁇ and propylene butene I) Copolymer] 0 weight 5 ⁇ and 10 weight of propylene-ethylene copolymer in a mixed composition consisting of alkylamine ethylene as an antistatic agent Oxide adduct 1 weight? ⁇ is mixed to form a base film material A).
• the film material for the coating layer (B is propylene-butene-11 copolymer [butene content 32 weight 5 ⁇ and propylene 50 parts by weight of each of the lene copolymers (ethylene content: 4.5 weight parts) were added to the mixture, and silicon dioxide [average particle diameter of 3 to 4 #m] 0.4 weight parts ⁇ was added to this mixture.
• silicon dioxide average particle diameter of 3 to 4 #m] 0.4 weight parts ⁇ was added to this mixture.
• total thickness is 40 m 3
• Example for Isotactic Polypropylene The same antistatic agent as in Example for Isotactic Polypropylene] was mixed with 1.0. Weight and melt-extruded, and the same as in Example below. As a result, an unstretched film and a biaxially stretched film having a thickness of 40 were obtained, and a similar corner discharge treatment was performed to adjust the surface wetting tension to 40 dynes Z ⁇ 3 ⁇ 4>. -did
• Example 2 The same isotactic polypropylene [including antistatic agent 1.0 weight 5 ⁇ ] as used in [Comparative Example] was used as the base layer film material. The same procedure as in Example 1 was carried out except that 4.0% by weight of a propylene-ethylene copolymer C-ethylene content of 4.0% by weight was used as a film material for the coating layer. An unstretched film and a biaxially stretched film having a tension of 40 dynes and a thickness of 40 m were obtained.
• Antistatic agent Polybutene-1 mixed with 1.0 weight was used as the base layer film material, and the low-density polyethylene used in Comparative Example 2 was used as the coating film.
• An unstretched film and a biaxially stretched film having a surface wetting tension of 40 dies and a thickness of 40 #m were obtained in the same manner as in Example 1 except that they were used as materials. .
• Example 2 The same isotactic polybutene-11 used in Example 1 was melt-extruded by itself and replaced with a replacement of a thickness of 720 m. I haven't seen Nakanobu. In this case, it was extremely difficult to form a film because the apposition sheet adhered to the mouth of the chinole, but the productivity and appearance were ignored completely, and the speed was reduced to about 0.5 m / min. We performed a melting appointment in the city. '
• the unstretched sheet was biaxially stretched in the same manner as in Example 1 to obtain a film having a thickness of 40 m. However, 1 2 5. Since stretching could be performed in C, the stretching temperature was set to 10 ° C. Next, a corona discharge treatment was applied to one side to adjust the surface wetting tension to 41 dynes / m2.
• Table 1 shows the characteristics of the biaxially stretched finolem.
• the stretched film and the biaxially stretched film (uninvented film) of the Example] are the unstretched or unstretched films of Comparative Examples 5 to 5.
• Ru have a c 0 emissions Chi halls intensity excellence than the biaxially stretched full I le arm (] both comparisons full I Sole beam Tei.
• Mataso other non iNVENTION off can have you in various properties
• the isolem shows an overall superior value compared to the comparative film, and especially the flexural index of the Young's modulus is the isotactic polybutene. 1) shows the same value as that of the single physolem, and the values of blocking and friction coefficient are not inferior to those of the polypropyrene alone.
• the uninvented composite film is characterized by its isotactic polybutene. With you combine the features of Russia pin les down, it is said pan Ji halls strength significantly modified ⁇ been full I le-time.
• Example 10 a bag is made by a fusing sealer CS idewelding machine 3 and a button-type hook is used at the opening of the bag. Installed. As a result, the film was not broken by the strong seal strength and the opening and closing of the button.
• the film of Example was stretched and deformed on a deformed bin to cover and close-pack it.
• the package was blown with hot air of ⁇ 90 ° C for 5 seconds and shrunk for 5 seconds to obtain a beautiful close-packed body.
• Comparative Example 1 3, 4, and 5 had poor adhesion, and caused lumps in deformed parts. Creat-like lumps were generated even after heat shrinkage, and a tightly packed package was obtained. I didn't
• the base layer of Example 1 was prepared by isotactic polyethylene terpolymer 1-ethylene-propylene terpolymer [ethylene: 3.5 weight, Propylene (8.5 weight), and the coating layer was prepared in the same manner except that the propylene-ethylene copolymer C ethylene content was 4.0 weight. .
• the typical characteristic value of the obtained film is Haze 1.3 ', ] 85, and the punch hole shear strength is also 2065, and the fusing seal strength is] 909 / cm ⁇
• the hook opening / closing resistance is the same as in Example 1]. It was good
• Bags were made by fusing with Sideweldinng machine. Although the seal strength of the bag was 9200 kC, which was lower than that of the stretched product, the seal energy up to breaking was high, and the external force was shocking. In addition, it showed good durability, and the hook opening / closing resistance was as small as 100% in the repeated test, but the durability was good.
• the film is made of vinylidene chloride or polybutadiene.
• the uninvented laminated unstretched film is made of a known polymer.

Landscapes

• Laminated Bodies (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Wrappers (AREA)

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Citations (2)

• 1982
  • 1982-06-08 JP JP9867182A patent/JPS58215345A/ja active Granted
• 1983
  • 1983-06-08 WO PCT/JP1983/000189 patent/WO1983004388A1/ja not_active Ceased

Patent Citations (2)

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