CN100402621C - Resin composition for sealant, sealant film, and its application - Google Patents
Resin composition for sealant, sealant film, and its application Download PDFInfo
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- CN100402621C CN100402621C CNB2005100854436A CN200510085443A CN100402621C CN 100402621 C CN100402621 C CN 100402621C CN B2005100854436 A CNB2005100854436 A CN B2005100854436A CN 200510085443 A CN200510085443 A CN 200510085443A CN 100402621 C CN100402621 C CN 100402621C
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Abstract
The invention provides a resin composition (EE) for a sealant, comprising a polyethylene resin (CC) or a polypropylene resin (DD), wherein: the polyethylene resin (CC) comprises 30 to 90% by weight of an ethylene polymer (A3), 5 to 50% by weight of a butene polymer (C) and 2 to 40% by weight of a tackifier (B) ((A3)+(B)+(C) = 100% by weight); the polypropylene resin (DD) comprises 30 to 90% by weight of a propylene polymer (A4), 5 to 50% by weight of an ethylene polymer (A5) and 1 to 20% by weight of a tackifier (B) ((A4)+(A5)+(B) = 100% by weight). The tackifier (B) has a glass transition temperature of 20 to 140 DEG C. and a number-average molecular weight of 1200 or less.
Description
This case is
On March 12nd, 2003, application number is
03119456.7, denomination of invention is
The seal gum resin combination Thing, seal gum and uses thereofDivide an application
Technical field
The present invention relates to the sealed Cellophane of heat sealability and easy separability and multilayered film and the container that uses the sealing glued membrane.
Background technology
In recent years, be accompanied by the variation of food, various wrapping material also occurred.Wherein, the container with easy separability is widely used as instant noodles, cheese vessel, container for cake and other food product containers etc.In having the sealing membrane of easy separability, require to satisfy simultaneously stopping property and the easy such two kinds of diametrically opposite performances of separability.And corresponding to the variation of food product containers, people wish to develop the sealing membrane with various heat seal strengths.On the other hand, see, when the peel seal face, can not residually peel off vestige (wire drawing) certainly, and require to prevent the wire drawing phenomenon by the outward appearance angle of pollution that prevents content and commodity.
Open in the flat 10-337829 communique the spy, disclosed a kind of easily openable film that constitutes by new LDPE (film grade) and 1-polybutene.Addition according to the 1-polybutene can be controlled sealing intensity, but along with the increase of the addition of 1-polybutene, the wire drawing phenomenon also occurred.
Summary of the invention
The object of the present invention is to provide a kind of multilayered film and container that has improved the sealed Cellophane of wire drawing phenomenon and used this sealed Cellophane.
That is, the present invention relates to
(1) a kind of sealed Cellophane, at least by two layers of formation that with substrate layer (X) and sealant layer (Y) serve as necessary composition, substrate layer (X) is made of the resin combination (AA) of the tackifier (B) of polyolefin resin with 50～98 weight % (A) and 2～50 weight %, sealant layer (Y) is made of polyolefine resin composition (BB)
Wherein, polyolefin resin (A) is that melting index (1238,190 ℃ of MFR, ASTM D, load 2.16kg) is that 0.1～50 (g/10min), density (ASTM D 1505) are 0.850～0.960 (g/cm
3) ethylene-based polymer (A1), or melting index (1238,230 ℃ of MFR, ASTM D, load 2.16kg) is the acrylic polymer (A2) of 1～50 (g/10min), or their mixture;
The second-order transition temperature of tackifier (B) is in 20～140 ℃ scope, and number-average molecular weight is below 1200.
(2) a kind of resin composition for sealant (EE) is made of polyethylene-based resin (CC) or acrylic resin (DD),
Wherein, polyethylene-based resin (CC) is that 0.1～50 (g/10min), density (ASTM D 1505) are 0.850～0.960 (g/cm by the melting index (ASTM D1238,190 ℃, load 2.16kg) of 30～90 weight %
3) the melting index (1238,190 ℃ of ASTM D, load 2.16kg) of ethylene-based polymer (A3), 5～50 weight % be that 0.1～25 (g/10min), density (ASTMD 1505) they are 0.880～0.925 (g/cm
3) butylene based polymer (C) and the tackifier (B) of 2～40 weight % (wherein, (A3)+(B)+(C)=100 weight %) constitute,
Polypropylene-based resin (DD) is that 0.1～50 (g/10min), density (ASTM D 1505) are 0.850～0.960 (g/cm by the acrylic polymer (A4) of 30～90 weight %, the melting index of 5～50 weight % (1238,190 ℃ of ASTM D, load 2.16kg)
3) ethylene-based polymer (A5) and the tackifier (B) of 1～20 weight % (wherein, (A4)+(A5)+(B)=100 weight %) constitute,
The second-order transition temperature of tackifier (B) is in 20～140 ℃ scope, and number-average molecular weight is below 1200.
(3) a kind of its thickness of being made up of resin composition for sealant (EE) is the seal gum of 1～100 μ m.
(4) a kind of multilayered film is characterized in that: it is to be laminated to the layered product that forms on the substrate layer (X) of above-mentioned sealed Cellophane or the seal gum with being selected from least a film (Z) in laminated film, aluminium foil, paper and the vapor-deposited film of polyolefin film, Polystyrene Film, polyester film, polyamide membrane, polyolefine and gas barrier properties resin molding.
(5) a kind of container is characterized in that: above-mentioned sealed Cellophane or the sealant layer of multilayered film (Y) is laminated Face to face, and wherein at least a portion is heat-sealed.
(6) a kind of container is characterized in that: above-mentioned sealed Cellophane or the sealant layer of multilayered film (Y) are laminated Face to face with the resin-formed body that is selected from polyethylene, ethylene vinyl acetate and the polypropylene, and wherein at least a portion is heat-sealed.
Embodiment
The present invention relates to the sealed Cellophane, multilayered film and the container that constitute by aforesaid resin combination.Below these each integral parts are specifically described.
Ethylene-based polymer (A1), (A3) and (A5)
As the ethylene-based polymer in the resin combination of the present invention (A1), (A3) and (A5), it both can be ethylene single-polymer, also can be ethylene, its molecular structure both can be the straight chain shape, also can be the chain with long-chain branch or short-chain branch.
When using ethylene, the alpha-olefin that uses as polymer monomers is that carbonatoms is 3～20, is preferably the alpha-olefin in 3～10 scopes, with the random copolymers of ethene.Example as concrete alpha-olefin, propylene, 1-butylene, 1-amylene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-nonene, 1-decene and their combination be can enumerate, propylene, 1-butylene, 4-methyl-1-pentene, 1-hexene, 1-octene wherein are preferably.And, can also contain a spot of other polymer monomers as required, for example 1,6-hexadiene, 1, cyclenes hydro carbons such as alkadienes such as 8-octadiene, cyclopentenes.When ethylene-based polymer (A1) is ethylene, ethylene content in the ethylene-based polymer (A1) is 85～99.9 moles of %, be preferably 90～99.5 moles of %, the density of ethylene-based polymer (A1) is 0.850～0.960, is preferably 0.860～0.935.And, when when ethylene-based polymer (A3) or (A5) being ethylene, ethylene-based polymer (A3) or (A5) in ethylene content be 50～99.9 moles of %, be preferably 60～99 moles of %, 70～99 moles of % more preferably, ethylene-based polymer (A3) or density (A5) are 0.850～0.960, are preferably 0.855～0.950, more preferably 0.860～0.940 (g/cm
3).
As ethylene-based polymer (A1), (A3) and preference (A5), except that above-mentioned ethylene, can also to enumerate density be 0.900～0.940, be preferably 0.905～0.935 (g/cm
3) the high-pressure process new LDPE (film grade).If ethylene-based polymer (A1), (A3) and (A5) in above-mentioned scope just can demonstrate good low-temperature heat-sealing.And, when making container, because the cohesiveness of inner layer film is little, so can fill content with very high filling speed by film.In addition, density is to be standard with ASTM D 1505, uses density gradient tube to measure.
And, above-mentioned ethylene-based polymer, with ASTM D-1238 is standard, for the melting index that records under the condition of 2.16kg (below, MFR (190 ℃) made in brief note) is 0.1～50, be preferably 0.2～30 at 190 ℃, load, the scope of 1～25 (g/10min) more preferably, if melting index in above-mentioned scope, is utilized existing forming machine, can carry out moulding with very high speed.
Manufacture method to above-mentioned ethylene-based polymer does not have particular restriction, can use catalysts for radical polymerization, Karen Phillips catalyzer, ziegler natta catalyst or metallocene catalyst, the independent polymerization by carrying out ethene or the incompatible preparation of copolymerization of ethene and alpha-olefin.
And,, be preferably MFR (190 ℃) and fusion tension force (190 ℃ measured value as ethylene-based polymer (A1) and (A3) particularly preferred ethylene-based polymer; The mN of unit; MT made in brief note) relation satisfy the polymkeric substance of following formula.
40×[MFR(190℃)]
-0.67≤MT≤250×[MFR(190℃)]
-0.67
At this, MT and MFR are the measured values under 190 ℃.Fusion tension force (MT) is meant the value of trying to achieve by the stress of measuring when the fused ethylene-based polymer stretched with certain speed.Specifically, be meant the value of measuring machine, under the condition of 190 ℃ of resin temperatures, extruded velocity 15mm/min, winding speed 15m/min, nozzle diameter φ 2.09mm, the long 8mm of nozzle, recording with the smart machine-processed MT of Japan.
As the concrete example of such ethylene-based polymer, can enumerate the so-called high-pressure process new LDPE (film grade) that obtains by radical polymerization.
And these ethene polymerss can use some kinds of ethylene-based polymers are mixed the composition that obtains, for example mixture of high-pressure process new LDPE (film grade) and straight chain shape ethylene.
And, used ethylene-based polymer (A1) among the present invention, (A3) and (A5) also can be two or more at least mixtures, for example mixture of high-pressure polyethylene and ethene-butene-1 copolymer with ethylene-based polymer of different densities and melting index.
Tackifier (B)
With regard to tackifier used among the present invention (B), can use alkyl phenolic resin, alkyl phenolic-acetylene resin, xylene resin, petroleum resin, coumarone-indene resin, terpine resin, rosin etc.And consider thermotolerance, weathering resistance, and be preferably above-mentioned each resin is carried out alicyclic saturated hydrocarbon resin after hydrogenation (adding water) is handled, be preferably the petroleum resin that add behind the water especially.These tackifier 20～140 ℃, be preferably in 40～120 ℃ of scopes and have second-order transition temperature, number-average molecular weight is preferably 600～1000 below 1200.If second-order transition temperature is higher than 140 ℃, so just fish-eye shaped spot (fish eye) might appear when film forming, and not selected.If second-order transition temperature is lower than 20 ℃, because the control effect of the wire drawing phenomenon when peeling off is less, and can produce the roller adhesion during moulding, therefore not selected on producing.
The butylene based polymer
As employed butylene based polymer (C) in the resin combination of the present invention, 1-butylene list polymers or 1-butylene and the carbonatoms except that 1-butylene are arranged is 2～20, be preferably the multipolymer of 2～10 alpha-olefin.As the concrete example of alpha-olefin, can enumerate ethene, propylene, 1-hexene, 4-methyl-1-pentene, 1-octene.The content of the 1-butylene in the butylene based polymer is 60～100, is preferably 70～100 (mole %).
The density of butylene based polymer is 0.880～0.925, is preferably 0.885～0.920 (g/cm
3).If density is in this scope,, when by the film production container, can reduces film, thereby can fill content with very high filling speed attached to the situation on the devices such as roller because cohesiveness is little.
And MFR (190 ℃) is in 0.1～25, be preferably 0.5～25, the scope of more preferably 1～25 (g/10min).If in this scope, cause excessive load just can for the engine of forming machine, can be with very high shaping speed film forming.
Such butylene based polymer can be opened clear 59-206415 communique, spy with the public clear 64-7088 communique of spy, spy and open clear 59-206416 communique, spy and open flat 4-218508 communique, spy and open the polymerization process preparation that flat 4-218607 communique, spy are opened the use taxis catalyzer of being put down in writing in the flat 8-225605 communique etc.Used butylene based polymer among the present invention both can use a kind ofly, also can two or morely use in combination.
Acrylic polymer (A2) and (A4)
As employed acrylic polymer (A2) in the propylene resin composition of the present invention and (A5), can be propylene list polymers, perhaps also can be the random copolymers of propylene and the alpha-olefin except that propylene.Propylene content in the random copolymers is 90 moles more than the %, is preferably 95 moles more than the %, and alpha-olefin content is less than 10 moles of %, is preferably less than 5 moles of %, as alpha-olefin, is preferably the mixture of ethene or 1-butylene or ethene and 1-butylene.
The fusing point (Tm) of the acrylic polymer (A2) that is recorded by DSC (DSC) is 120～170 ℃, is preferably 125～165 ℃, more preferably 130～165 ℃.The MFR of acrylic polymer (A2) (230 ℃, load 2.16kg) is 1～100g/10min, is preferably 5～50g/10min, more preferably 10～30g/10min.
The fusing point (Tm) of the acrylic polymer (A4) that is recorded by DSC (DSC) is 100～160 ℃, is preferably 105～155 ℃, more preferably 110～150 ℃.The MFR of acrylic polymer (A4) (230 ℃, load 2.16kg) is 0.1～50g/10min, is preferably 0.5～45g/10min, more preferably 1～40g/10min.Acrylic polymer can use ziegler natta catalyst or metallocene catalyst, the independent polymerization by carrying out propylene or the incompatible preparation of copolymerization of propylene and alpha-olefin.
Resin combination (AA)
The resin combination (AA) that forms substrate layer (X) by 50～98 weight %, be preferably 60～98 weight %, more preferably the polyolefin resin of 70～98 weight % (A) and 2～50 weight %, be preferably 2～40 weight %, the tackifier of 2～30 weight % (B) formation more preferably.
Polyolefine resin composition (BB)
Form the polyolefine resin composition of sealant layer (Y), so long as the known polyolefin resin composite that polyethylene resin composition, polypropylene resin composite etc. are used as seal gum, just without limits, can use, be preferably polyethylene-based resin described later (CC), polypropylene-based resin (DD).
Polyethylene-based resin (CC)
Polyethylene-based resin (CC) by 30～90 weight %, be preferably 35～85 weight %, more preferably the ethylene-based polymer of 35～80 weight % (A3) and 5～50 weight %, be preferably 10～48 weight %, more preferably 15～45 weight % butylene based polymer (C) and 2～40 weight %, be preferably 2～30 weight %, the tackifier of 2～20 weight % (B) (wherein, (A3)+(B)+(C)=100 weight %) that form more preferably.
Polypropylene-based resin (DD)
Polypropylene-based resin (DD) by 30～90 weight %, be preferably 40～80 weight %, more preferably the acrylic polymer of 50～80 weight % (A4) and 5～50 weight %, be preferably 10～45 weight %, more preferably the ethylene-based polymer of 15～45 weight % (A5) and 1～20 weight %, be preferably 2～15 weight %, the tackifier of 2～10 weight % (B) (wherein, (A4)+(A5)+(B)=100 weight %) that form more preferably.
Resin composition for sealant (EE)
Resin composition for sealant (EE) is that olefine resin (DD) is formed by polyethylene-based resin (CC) or poly-third.
Seal gum
Seal gum of the present invention is formed by resin composition for sealant (EE), and its thickness is 1～100 μ m, is preferably 2～80 μ m.If seal gum is to be formed by resin composition for sealant (EE), then can between sealing intensity and easy separability, obtains good balance, thereby obtain being suitable for the container with easily openable of practical application.
Sealed Cellophane
Sealed Cellophane of the present invention is at least by substrate layer (X) and this two-layer formation of sealant layer (Y).Substrate layer (X) is formed by polyolefin resin (A) and tackifier (B), and sealant layer (Y) is formed by polyolefine resin composition (BB).The scope of the blending ratio of each composition is in the substrate layer (X): polyolefin resin (A) is 50～98 weight %, is preferably 60～95 weight %, and tackifier (B) are 2～50 weight %, is preferably 5～40 weight %.If substrate layer (X) in this scope, just can be obtained good balance by the film that these compositions obtain, thereby obtain being suitable for the container with easily openable of practical application between sealing intensity and easy separability.
As the feature of sealed Cellophane of the present invention, the tackifier that also will have certain special properties sometimes use as the moiety of substrate layer (X).By using aforesaid tackifier, the wire drawing phenomenon can not take place, can obtain good equilibrated film between sealing intensity and easy separability in formation.Particularly when substrate layer (X) and sealant layer (Y) being carried out lamination, because the bounding force of two interlayers is strong, so when easily peel container uses, can form the good film of separability by the extruding layer platen press.
In the present invention, in scope as the performance of sealed Cellophane of the present invention, as required, also can contain additives such as oxidation inhibitor, heat-resisting stabilizing agent, weather stablizer, slip(ping)agent, anti (anti-caking) agent, crystallization nucleating agent in sealant layer and/or the substrate layer.
And, with above-mentioned each composition and after the various additives that add as required mix with mixing machines such as for example Henschel mixing roll, Banbury, drum-type mixing rolls, both can make particulate state and be used for following film moulding with single screw rod and even twin screw extruder, also can be just with in the mentioned component blended state input film shaper.
By the film that forms by above-mentioned each resin Composition, can make the sealed Cellophane of the present invention that is applicable to the wrapping material that need have easy separability.Sealed Cellophane of the present invention with regard to its forming method, can adopt extrusion moulding method, blow molding method and extruding layer platen press etc. that each layer together extruded at least by substrate layer (X) and this two-layer formation of sealant layer (Y).When adopting extrusion moulding method and blow molding method, can under the condition of 180～240 ℃ of resin temperatures, produce the good film of uniform film thickness usually.When adopting the extruding layer platen press, can under the condition of 220～350 ℃ of resin temperatures, produce the good film of uniform film thickness usually.And, in addition, make substrate layer (X) and sealant layer (Y) respectively, carry out lamination with extruding layer platen press or dry lamination method respectively, also can make sealed Cellophane of the present invention.The thickness range of the substrate layer in the sealed Cellophane (X) is generally 3～100 μ m, is preferably 5～80 μ m, and the thickness range of sealant layer (Y) is generally 3～50 μ m, is preferably 5～20 μ m.
Multilayered film
Sealed Cellophane of the present invention both can use separately, can also be laminated to less the structure that a kind of other base material film (Z) forms multilayered film on this substrate layer (X) side, generally was used for packing film or wrapping sheet.
As base material film (Z), there is no particular limitation, but application target according to wrapping material, suitable selecting for use: polyolefin films such as polyethylene, polypropylene, the phenylethylene resin series film, polyester film such as polyethylene terephthalate, polybutylene terephthalate, polyamide membrane that nylon 6, nylon 66 are such or their stretched film, the laminated film of the resin molding that polyolefin film and polyamide membrane, ethylene vinyl alcohol copolymer film are such with gas barrier property, tinsels such as aluminium foil, or the vapor-deposited film that forms by evaporations such as aluminium, silicon, paper etc.This base material film (Z) both can only use a kind of, also can be used in combination.
As the method that goes up the laminating seal glued membrane at above-mentioned base material film (Z), can adopt to go up above-mentioned substrate layer resin and/or sealant layer resin (together) are extruded laminated extruding layer platen press, base material film (Z) and sealed Cellophane be carried out the method for dry lamination etc. at base material film (Z).Wherein, from productive angle, be preferably the extruding layer platen press.Multilayered film of the present invention, when particularly promptly using the extruding layer platen press that substrate layer (X) and sealant layer (Y) are carried out lamination, do not need to use tackiness agent etc., just can make to have enough bond strengths between substrate layer and the sealant layer, and phenomenon such as be difficult to peel off at interlayer.
As a kind of embodiment of multilayered film, can enumerate the structure of seal gum rete (substrate layer side)/other rete (Z).At this,, can enumerate the rete of laminated film, aluminium foil, vapor-deposited film and the paper etc. that are selected from above-mentioned Polystyrene Film, polyester film, polyamide membrane, polyolefin film and gas barrier resins film as other rete (Z).As the example of gas barrier resins film, for example, can enumerate the ethylene-vinyl alcohol copolymer film.
When the substrate layer (X) of sealed Cellophane of the present invention and other rete (Z) are can not be with sufficient bond strength bonding, can form seal gum rete (substrate layer side)/bonding coat/such structure of other rete (Z).As bonding coat, if with polyurethanes, the such tackifier coating agent of isocyanates tackiness agent, or the such modified polyolefin of unsaturated carboxylic acid graft polyolefine etc. is as tackiness agent, just can make layer being bonded together securely of adjacency.
Container
This container can by bonded to each other between the sealant layer (Y) with above-mentioned multilayered film or the sealant layer (Y) of multilayered film and other film is bonded to each other, form desired shape and make by at least a portion around it being sealed then from the outside surface side.And, can make the bag-like container of sealing by all heat-sealings on every side.If the forming process of this bag-like container is combined with the filling work procedure of content, that is, the bottom of bag-like container and sidepiece are sealed the back fill content, and then, just can make wrapping body the top heat-sealing.Thereby this multilayered film can be used for the packaging automat of solids, powder or liquid materials such as bar cake.
And, with multilayered film and even sheet or other film and even sheet in advance by vacuum forming or press empty moulding etc. to be shaped to the container of cup-shaped, the container that obtains by injection molding etc., or the container that forms by paper base material etc., in these containers, fill content, then multilayered film of the present invention is covered as covering material, the top and even the sidepiece of container sealed, like this, just obtained having packed the container of content.This container is applicable to the packing of instant noodles, sauce, jam (freezing), pudding, bar cake etc.
According to embodiment this law is described below, but the present invention is not limited to these embodiment.
(embodiment a1)
(at the laminating of the substrate layer (X) of PET film (Z))
(X) uses resin as substrate layer, is by will be by high-pressure polyethylene (ethylene-based polymer (A1) component, density 0.917g/cm
3MFR (190 ℃) 7.2g/10min, MT28mN) 90 weight % and the waste river system silicone P-125 of the chemistry society (number-average molecular weight 820 used as tackifier (B), 80 ℃ of second-order transition temperatures) resin combination formed of 10 weight % is delivered to extruding in the lamination processing machine of the die width 500mm that has φ 65mm forcing machine concurrently, and forming thickness in the condition laminated of 290 ℃ of resin temperatures, air gap 130mm, shaping speed 80mm/min is the PET film (Z) of 12 μ m.The thickness of the substrate layer that makes here, (X) is 30 μ m.
(manufacturing of multilayered film)
Then, as sealant layer (Y) resin, be by will be by high-pressure polyethylene (ethylene-based polymer (A3) component, density 0.918g/cm
3, MFR (190 ℃) 23g/10min, MT8mN) 60 weight % and 1-butylene list polymers ((C) component, density 0.907g/cm
3, MFR (190 ℃) 0.2g/10min) composition formed of 40 weight % under 270 ℃ of resin temperatures, use and the above-mentioned same lamination processing machine of extruding, carry out lamination in the substrate layer side of the above-mentioned laminated film that obtains, obtain multilayered film.The thickness of the sealant layer that makes (Y) is 10 μ m.
The multilayered film that makes is estimated according to following method, be the results are shown in table-1.
(1) heat seal strength: make the strip test film of two pieces of 15mm, they are overlapped, under specified temperature, to seal under pressure 0.2Mpa, the condition of 1 second encapsulation time.Then, along 180 ° of directions with the speed of 300mm/min with splitting, measure the stripping strength of this moment, should be worth as heat seal strength (N/15mm).
(2) easy separability: after having measured heat seal strength, observe membrane sample, film is stretched but not the situation of fracture be designated as " zero ".Otherwise, film is stretched and situation about rupturing is designated as " * ".
(3) stringiness: observe the trim of the membrane sample after sealing, the situation that trim and its have adhered to filament resin on every side is designated as " * ", does not find that the situation of filament resin is designated as " zero ".
(comparative example a1)
Except that the content that adopts table-1 described substrate layer resin to form, similarly carry out the manufacturing and the evaluation of multilayered film with embodiment a1.The results are shown among the table a1.
In comparative example a1, when stripping test, the wire drawing phenomenon has been taken place in substrate layer (X) and sealant layer (Y) when peeling off.
By the result shown in the table-1 as can be known, film of the present invention is the film of a kind of easy separability and stringiness excellence.
(embodiment b1)
(manufacturing of resin combination (CC))
Will be as high-pressure polyethylene (the density 0.918g/cm of ethylene-based polymer composition (A3)
3, MFR (190 ℃) 9.5g/10min) and 65 weight % and as 1-butylene list polymers (the density 0.915g/cm of butylene based polymer composition (C)
3, MFR (190 ℃) 1.8g/10min) and 20 weight % and use Henschel mixing roll uniform mixing as tackifier (B) (the system silicone P-125 of waste river chemistry society, number-average molecular weight 820,80 ℃ of second-order transition temperatures) 10 weight %.Directly is that the single shaft forcing machine of φ 40mm carries out granulation with the mixture that obtains with spiral shell, obtains resin composition pellet (CC) thus.
(embodiment b2)
(manufacturing of film)
Coated with isocyanate class tackifier coating agent on the PET film of 12 μ m, use have φ 65mm forcing machine concurrently extrude the lamination processing machine, under 290 ℃ of temperature, be that 9.5g/10min, density are 0.917g/cm to MFR (190 ℃)
3High-pressure polyethylene extrude lamination, obtain the base material film (Z) of PET/LDPE (12 μ m/30 μ m).Under 290 ℃ of temperature, extrude lamination re-using the composition grain that obtains by embodiment b1 on the LDPE of this base material film layer, make the film that constitutes by PET/LDPE/ composition (CC) (12 μ m/30 μ m/10 μ m).The results are shown in table-1.
(comparative example b1～b2)
Except that the content of ethylene-based polymer, butylene based polymer and tackifier (B) is shown in table-1, the same with embodiment b1, b2 film is estimated.The results are shown in table-1.
(embodiment c1)
(manufacturing of multilayered film)
(X) uses resin as substrate layer, be by will be by propylene list polymers (acrylic polymer (A2) component, MFR (230 ℃)=7.0g/10min, 162 ℃ of fusing points) 90 weight % and the waste river system silicone P-125 of the chemistry society (number-average molecular weight 820 used as tackifier (B), 80 ℃ of second-order transition temperatures) resin combination of 10 weight % composition, with as sealant layer (Y) resin, propylene-ethylene-butene multipolymer (acrylic polymer (A4) component, MFR (230 ℃)=7.0g/10min, 138 ℃ of fusing points) 50 weight %, ethene butene-1 copolymer (ethylene copolymer (A5-1.) composition, density 0.885g/cm
3, MFR (190 ℃) 3.6g/10min, 12 moles of % of 1-butylene content) and 30 weight % and high-pressure polyethylene (ethene polymers (A5-is 2.), MFR (190 ℃) 7.2g/10min, density 0.917g/cm
3) resin combination formed of 20 weight %, delivering to the die width that has φ 50mm and φ 40mm forcing machine concurrently is in the double-deck injection moulding machine of 300mm, obtains the multilayered film of base material thickness 40 μ m, sealant layer (Y) thickness 20 μ m under the condition of 230 ℃ of resin temperatures, shaping speed 10mm/min.
The multilayered film that makes uses the same method and estimates.The results are shown in table-2.
(embodiment d2, comparative example c1)
Except that the resin groups of substrate layer and sealant layer becomes the described content in table-2, similarly obtain multilayered film with embodiment c1.The evaluation result of the film that makes is shown in table-2.
The invention effect
Resin composition for sealant of the present invention, and the film that makes thus can be at heat sealability and easily obtain good balance between the separability, and, even package strength is very low the wire drawing phenomenon can not take place yet, therefore in good shape after peeling off, can be applicable to the used for packing foods container.
Table-1
| Embodiment a1 | Embodiment b2 | Comparative example a1 | Comparative example b1 | Comparative example b2 | |
| Substrate layer (X) ethylene-based polymer (A1) (weight %) tackifier (B) (weight %) | 90 10 | 100 0 | 100 0 | 100 0 | 100 0 |
| Sealant layer (Y) ethylene-based polymer (A3-1.) (weight %) ethylene-based polymer (A3-2.) (weight %) butylene based polymer (C) (weight %) tackifier (B) | 60 40 0 | - 65 25 10 | 60 40 0 | - 80 20 0 | - 75 25 0 |
| 120 ℃ 130 ℃ 140 ℃ 150 ℃ 160 ℃ of heat seal strength (N/15mm) package temperature | 2.0 2.6 3.5 3.8 4.1 | 0.5 2.5 3.2 3.5 3.6 | 1.9 2.4 3.2 3.7 4.0 | 1.0 3.3 4.7 6.0 6.4 | 0.5 3.1 4.0 4.0 4.2 |
| Easy separability | ○ | ○ | × | × | ○ |
| Stringiness | ○ | ○ | × | ○ | × |
Table-2
| Embodiment c1 | Embodiment d2 | Comparative example c1 | |
| Substrate layer (X) ethylene-based polymer (A1) (weight %) acrylic polymer (A2) tackifier (B) (weight %) | 10 80 10 | 12 88 0 | 12 88 0 |
| Sealant layer (Y) acrylic polymer (A4) (weight %) ethylene-based polymer (A5-1.) (weight %) ethylene-based polymer (A5-2.) (weight %) tackifier (B) | 50 30 20 0 | 45 35 20 10 | 50 30 20 0 |
| 130 ℃ 140 ℃ 150 ℃ 160 ℃ 170 ℃ of heat seal strength (N/15mm) package temperature | 7.2 8.6 8.9 9.5 9.7 | 6.9 8.0 8.4 9.0 9.2 | 5.5 5.6 5.9 6.5 6.8 |
| Easy separability | ○ | ○ | × |
| Stringiness | ○ | ○ | × |
Claims (5)
1. a resin composition for sealant (EE) is made of polyethylene-based resin (CC) or acrylic resin (DD),
Wherein, polyethylene-based resin (CC) by the melting index of under 1238,190 ℃ of ASTM D, load 2.16kg condition, measuring of 30～90 weight % be 0.1～50g/10min, the density measured under ASTMD 1505 conditions is 0.850～0.960g/cm
3The melting index of under 1238,190 ℃ of ASTM D, load 2.16kg condition, measuring of ethylene-based polymer (A3), 5～50 weight % be 0.1～25g/10min, the density measured under ASTM D 1505 conditions is 0.880～0.925g/cm
3Butylene based polymer (C) and the tackifier (B) of 2～40 weight % constitute, wherein, (A3)+(B)+(C)=100 weight %,
Polypropylene-based resin (DD) by the melting index of under 1238,190 ℃ of ASTM D, load 2.16kg condition, measuring of the acrylic polymer (A4) of 30～90 weight %, 5～50 weight % be 0.1～50g/10min, the density measured under ASTM D 1505 conditions is 0.850～0.960g/cm
3Ethylene-based polymer (A5) and the tackifier (B) of 1～20 weight % constitute, wherein, (A4)+(A5)+(B)=100 weight %,
The second-order transition temperature of tackifier (B) is in 20～140 ℃ scope, and number-average molecular weight is below 1200.
2. a thickness that is made of the described resin combination of claim 1 is the seal gum of 1～100 μ m.
3. multilayered film is characterized in that: it is that at least a film (Z) that will be selected from laminated film, aluminium foil, paper and the vapor-deposited film of polyolefin film, Polystyrene Film, polyester film, polyamide membrane, polyolefine and gas barrier properties resin molding is laminated to the layered product that forms on the described sealant layer of claim 2.
4. container, it is characterized in that: the sealant layer of described seal gum of claim 2 or the described multilayered film of claim 3 is laminated Face to face, and wherein at least a portion is heat-sealed.
5. container, it is characterized in that: the sealant layer of described seal gum of claim 2 or the described multilayered film of claim 3 is laminated Face to face with the resin-formed body that is selected from polyethylene, ethylene vinyl acetate and the polypropylene, and wherein at least a portion is heat-sealed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002070899 | 2002-03-14 | ||
| JP2002070899 | 2002-03-14 | ||
| JP2002311812 | 2002-10-25 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031194567A Division CN100364767C (en) | 2002-03-14 | 2003-03-12 | Resin Composition for sealing gum, sealing gum and its usage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1766025A CN1766025A (en) | 2006-05-03 |
| CN100402621C true CN100402621C (en) | 2008-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100854436A Expired - Lifetime CN100402621C (en) | 2002-03-14 | 2003-03-12 | Resin composition for sealant, sealant film, and its application |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185402A (en) * | 1996-11-29 | 1998-06-24 | 住友化学工业株式会社 | Elastic packing film |
| JPH11254611A (en) * | 1998-03-06 | 1999-09-21 | Riken Vinyl Industry Co Ltd | Olefinic wrap film |
| JP2001302995A (en) * | 2000-04-21 | 2001-10-31 | Sekisui Chem Co Ltd | Surface protection film |
| WO2002016525A1 (en) * | 2000-08-22 | 2002-02-28 | Mitsui Chemicals, Inc. | Sealing resin composition, sealing films and use thereof |
-
2003
- 2003-03-12 CN CNB2005100854436A patent/CN100402621C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185402A (en) * | 1996-11-29 | 1998-06-24 | 住友化学工业株式会社 | Elastic packing film |
| JPH11254611A (en) * | 1998-03-06 | 1999-09-21 | Riken Vinyl Industry Co Ltd | Olefinic wrap film |
| JP2001302995A (en) * | 2000-04-21 | 2001-10-31 | Sekisui Chem Co Ltd | Surface protection film |
| WO2002016525A1 (en) * | 2000-08-22 | 2002-02-28 | Mitsui Chemicals, Inc. | Sealing resin composition, sealing films and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1766025A (en) | 2006-05-03 |
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