CN1070447C - Strippable film and strippable packing material - Google Patents
Strippable film and strippable packing material Download PDFInfo
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- CN1070447C CN1070447C CN97118509A CN97118509A CN1070447C CN 1070447 C CN1070447 C CN 1070447C CN 97118509 A CN97118509 A CN 97118509A CN 97118509 A CN97118509 A CN 97118509A CN 1070447 C CN1070447 C CN 1070447C
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Abstract
The present invention provides strippable film having low- temperature sealing property, heat resistant and impact resistance and strippable packing material made thereof and backing material, which is charactered in that Ethylene-alpha -olefin copolymer contains 7 to 20wt.% alpha -olefin content and has 0.892 to 0.925g/cm<3> density, has a range of a melt flow rate of 0.1 to 40g/10min in terms of a load of 2.16kg at 190 deg.C.
Description
The easy peel seal material of the film that the present invention relates to easily peel off and this easy stripping film of employing.
Polypropylene has good resistance to effect of heat, forming characteristics, engineering properties and outward appearance, and carries out easily when the processing of waste, the features such as advantage little to the influence of food.
Effectively utilize above-mentioned feature, polypropylene can be widely used as the packing of various food, perhaps the simple food container of double as packing.Therefore, the lid of these containers can adopt the lid of the easy-to-pull that is not opened with suitable power widely with just can having resistance, meanwhile, also wishes to develop to be best suited for polyacrylic easy peel-off covers material.
In the past, known the such special resin of the ethylene-vinyl acetate copolymer that will resemble ionomer and modification directly or with the form of compound as sealing layer, present the character that to peel off easily with polypropylene, the material that promptly has easy fissility, perhaps low-molecular-weight ethylene-vinyl acetate copolymer adhesivess such as (EVA) is applied on base film, make it to present the material of appropriate bond strength.
But, using under the situation of adhesives, exist in that the operating environment that with an organic solvent causes in the coating processes worsens and at low temperatures mechanical strength reduce and cause problem such as content leakage.And these cover materials are because the characteristic of leakproofing material and caused rottenly by heat and moisture easily, and poor heat resistance has greatly limited its range of use.In addition, ethylene-vinyl acetate copolymer and ionomer are easy to generate foul smell, are unsuitable for being used for food.
Also have, known that employing is the technology of the raw MAT'L blank of basis formation as aquaseal with the polypropylene.
For example, disclose clear 61-246061 communique in special permission and put down in writing resin combination that employing forms by the crystallinity low ethene-alpha-olefin copolymer of the polypropylene of 40-80 weight % and 60-20 weight % technology as heat seal lands.And the special permission disclose put down in writing in the flat 6-328639 communique employing contain polybutene, polyethylene and polyacrylic resin combination as heat seal lands, with the technology of polypropylene as substrate layer.
But these two kinds of resin combinations all exist owing to polypropylene is must component not have enough low temperature sealings and problem such as the range of temperatures that is suitable for sealing is narrow.
The object of the present invention is to provide under situation, have suitable easy fissility, essential and be the easy stripping film of enough resistance to effect of heat, Dent resistance and low-temperature heat-sealing and the easy peel seal material of making by this film and base material as packing.
The present inventor studies for the easy stripping film with easy fissility, resistance to effect of heat, Dent resistance and low-temperature heat-sealing with by the easy peel seal material that this film and base material are made, the result, find not adopt polypropylene unexpectedly, the film that only adopts specific ethene-alpha-olefin copolymer to make leakproofing material has just reached purpose of the present invention, thereby finishes the present invention.
That is to say, the present invention relates to a kind of easy stripping film, it is characterized in that containing the alpha-olefin of 7-20 weight %, density is 0.892-0.925g/cm
3, the fusing flow velocity of measuring under 190 ℃, the loading condition of 2.16kg (MFR) is formed by ethene-alpha-olefin copolymer in 0.1-40g/10 minute scope.
And, the invention still further relates to easy peel seal material, it is characterized in that constituting by above-mentioned easy stripping film and base material.
Describe the present invention below in detail.
So-called in the present invention easily peeling off be meant and guarantee actual used leak tightness, and the character that just can be broken a seal easily by people's hand.Specifically for the heat seal of easy peel seal material and polypropylene-based resin container made, be when peeling rate is 300 mm/min, carry out the result of the peel test of 180 ° or 90 °, the seal temperature that peel strength is suitable in the wide or 400-2000g/15mm wide region at 600-2500g/15mm respectively has easy fissility in the width more than 30 ℃ being called of existing.If 180 ° of peel strengths are lower than the 600g/15mm width, or 90 ° of peel strengths are lower than the 400g/15mm width, and the leak tightness of content is just reduced, and the impact in the transportation can cause peeling off of hermetic unit.On the other hand, if 180 ° of peel strengths surpass the 2500g/15mm width, or 90 ° of peel strengths surpass the 2000g/15mm width, just do not have easy fissility, are difficult to use in and peel off.
The said ethene-alpha-olefin copolymer of the present invention contains the alpha-olefin of 7-20 weight %, it is desirable to 8-18 weight %, and density is 0.892-0.925g/cm
3, it is desirable to 0.895-0.920g/cm
3, and best be 0.895-0.912g/cm
3And density is measured according to JIS-K6760.
Less than 7 weight %, or density has surpassed 0.925g/cm at the content of alpha-olefin
3Situation under, can not obtain enough and polyacrylic heat seal strength, the leak tightness of content is poor.And surpassed 20 weight % at the content of alpha-olefin, or density is less than 0.892g/cm
3Situation under, film becomes to surpass required soft degree and be difficult to and handles.
For example can listing as the alpha-olefin of this copolymer, carbon numbers such as propylene, butene-1, hexene-1, octene-1 are the alpha-olefin of 3-12.
And in the present invention, the density of ethene-alpha-olefin copolymer is 0.895-0.920g/cm
3, this alpha-olefin is that carbon number is that the easy stripping film that the ethene-alpha-olefin copolymer of the alpha-olefin of 3-12 forms is desirable.
The said ethene-alpha-olefin copolymer of the present invention, it is desirable in 0.1-25g/10 minute the scope at 0.1-40g/10 minute at 190 ℃, the fusing flow velocity (MFR) of 2.16kg load.
When the MFR of above-mentioned ethene-alpha-olefin copolymer does not reach 0.1g/10 minute, the poor in processability of film and not ideal enough.And MFR has been when having surpassed 40g/10 minute, just can not obtain stable fused film and be difficult to make film, and if as cover material, sealing layer can gross distortion because heat seal strength, appearance poor and not ideal enough.
When ethene-alpha-olefin copolymer of the present invention is made the thick sheet of 0.3mm, adopt, be lower than 0.25mg/cm through the lip-deep exudate of sheet (still, not comprising the additive-treated oil exudate) after 7 day time at 60 ℃
2Ethene-alpha-olefin copolymer be desirable.
The preparation method of ethene-alpha-olefin copolymer of the present invention can use ethene and alpha-olefin, under the situation of Ziegler class catalyst or the existence of class of metallocenes catalyst, at normally 0-300 ℃, normal pressure-3000kg/cm
2, have or do not have under the situation that solvent exists, carry out with gas-solid, solution-air, form liquid-solid or even liquid phase.And polymerization can be carried out with any one method in batch (-type), semi continuous, the continous way.Even also can carry out being aggregated under the differential responses condition that is divided into more than two steps.The adjusting of mol wt is carried out though can wait by the amount of regulating polymerization temperature, catalyst concn, comonomer, then is more effective by add hydrogen in polymerization system.
Ziegler class catalyst is by the solid catalyst component that contains transition metal, and catalyst-accelerator component that organo-aluminum compound forms and carrier as required form.
The class of metallocenes catalyst is to react more than one the cmpd, the transistion metal compound of periodic table of elements IV B family, carrier as required that having of generation stablize in the anionic cmpd by the reactant with organo-aluminium hydrocarbon compound, organo-aluminum compound, transistion metal compound and organo-metallic compound to form.
Though ethene-alpha-olefin copolymer of the present invention can use separately, if but the condition of final composition within the scope of the present invention, concerning this ethene-alpha-olefin copolymer, also can be that more than one mixing in ethene-alpha-olefin copolymer and/or the Alathon are used.
For example, after said mixture mixed by Heng Xier mixer (ヘ Application シ ェ Le ミ キ サ-), drum mixer etc., can perhaps said mixture be mixed the system film that film is carried out in granulation afterwards by adopting extruder, mixer, sealed type mixer etc. directly with film system film.
There is no particular limitation to the film-forming method of easy stripping film of the present invention, in general can adopt inflation system film film film forming apparatus and T pattern tool film film forming apparatus etc.
The ethene-alpha-olefin copolymer that the present invention relates to can contain in the scope that does not influence the object of the invention: metallic soap alkali such as calcium stearate as required; Neutralizing agents such as hydrotalcite; With 2,6-two-tert-butyl group-p-Cresol (BHT), four (methene-3-(3,5-two-tert-butyl group-4-hydroxyphenyl) propionic ester) methane (IRGANOX1010), n-octadecane base-3-(4 '-hydroxyl-3,5 '-two-tert-butyl group-phenyl) propionic ester (IRGANOX1076) are the heat-resisting stabilizing agent of the phenol resin class of representative; Be the phosphide class heat-resisting stabilizing agent of representative with two (2,4-two-tert-butyl-phenyl) pentaerythrite diphosphides and three (2,4-two-tert-butyl-phenyl) phosphide etc.; With higher fatty acid amide, high-grade aliphatic ester is the lubricant of representative; Carbon number is antistatic agents such as the aliphatic glycerin ester, sorbitol ester, macrogol ester of 8-22; With silicon dioxide, calcium carbonate, talcum etc. is that the obstruction of representative prevents agent; Weather stabilizer, antidim compound, pigment, dyestuff, drip agent, nucleating agent etc. are generally used for adding to the various mixtures in the polypropylene-based resin.
Ethene-alpha-olefin copolymer of the present invention as required, in the scope usually used as processability modifier, and does not influence in the scope of the object of the invention and can contain the high-pressure process polypropylene.
Easy peel seal material of the present invention is to be made of easy stripping film and base material that above-mentioned ethene-alpha-olefin copolymer forms.
Easily stripping film can use ethene-alpha-olefin copolymer of the present invention with individual layer, and perhaps this ethene-alpha-olefin copolymer also can be used for multilayer film and is used as at least one superficial layer.
There is no particular limitation to the method that forms multilayer film, can list methods such as co-extrusion modling method, interlayer forming process.
Material as multilayer film can list than the higher polypropylene-based resin of the light copolymer density of above-mentioned ethene-α-alkene.
There is no particular limitation for the manufacture method of the leakproofing material that the present invention is easily peeled off, and what can list is known the whole bag of tricks such as drying layer platen press, extruding layer platen press, interlayer laminating, extrusion molding for example.
For example can use as base material of the present invention can film forming any poly-mer or paper, aluminium foil, viscose film etc.For can film forming poly-mer adducible be amilans such as nylon 6, nylon 66, nylon 11, nylon 12 for example; The alkide resin of polyethylene terephthalate, polybutylene terephthalate etc.; The polyolefin resin of polypropylene, poly-1-butylene, poly--4-methyl-1-pentene etc.; The inferior ethene of poly-dichloro, polyvinylchloride, polystyrene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polycarbonate etc. are considered and wherein gas-barrier property, printing, the transparency, rigidity, adhesive bonding property etc. can be carried out suitable selection.Furtherly, base material is can as required a plurality of raws MAT'L be carried out lamination and use.And under the situation that base material can stretch, can carry out uniaxial drawing or biaxial stretch-formed.
Among these raw materials, desirable base material is amilan, alkide resin, aluminium foil etc.
For with easy stripping film of the present invention and easily the bonding polypropylene-based resin of peel seal material there is no particular limitation, adducible is for example Noblen, propylene-ethylene random copolymers and propylene-ethylene block copolymer.There is no particular limitation to the ethylene contents of these copolymers, for example is 0.1-15 weight %.
As described above, can provide according to the present invention that low temperature sealing is good, the heat-sealing temperature scope is big, and have the easy stripping film of resistance to effect of heat and Dent resistance and the easy peel seal material that forms by this easy stripping film and base material.
And, the easy stripping film of the most suitable container of making polypropylene-based resin system of the present invention etc. and easy peel seal material.
Embodiment
According to embodiment the present invention is described below, but these embodiment do not do any qualification to the present invention.
The measuring method of the physical parameter in the following examples and the Comparative Examples at first, is described.(1) density (d)
Method according to JIS K6760 regulation.In 100 ℃ water, carry out measuring density after 1 hour the annealing in process.But in the density of sample less than 0.905g/cm
3The time, can not anneal.(2) fusing flow velocity (MFR)
According to the condition 4 of the table 1 of JIS K6760, under 190 ℃, 2.16 kg load conditions, measure.(3) surperficial seepage discharge
Use 150 ℃ hot stamping machine, make the sheet of required several 150mm * 150mm * 0.3mm, in 60 ℃ of baking ovens,, adjust 7 days time with mutually non-touching state.With these sheets, it is clean with about 300 milliliters washed with heptane to be equivalent to each sheet, reclaims solution, dry weighing.Just draw surperficial seepage discharge with the weight of measuring divided by the face area of sheet.
When measuring surperficial seepage discharge, used sample adopts additive-free prescription as far as possible.And, being difficult to modulate under the situation of not having the interpolation sample, the mensuration that composition carries out high-speed liquid chromatography analytic method and gas chromatographic method is oozed out on the surface of cleaning, reclaim, calculate various additive-treated oil concentration by its result, proofread and correct.(4) content of alpha-olefin
The employing infrared spectrophotometer can be in the hope of the characteristic absorption of alpha-olefin.(5) sealing intensity
By base material and easily easy stripping film one side of the easy peel seal material made of stripping film and the sheet that forms by bonded polypropylene-based resin be superimposed together, under 160 ℃, 190 ℃, 220 ℃ tack temperature, at 4kg/cm
2Pressure under, after on the silverware of 10mm, sealing, fully cooling.Get the wide test piece of 15mm from the sample of gained, crosshead speed is 300mm/ minute, is 180 ° in peel angle, and under 90 ° the situation, the intensity during the peel seal part is as being called sealing intensity (g/15mm).
In embodiment and Comparative Examples, substrate layer and easily can not peeling off between the stripping film, and can peel off between sheet that forms by the polypropylene-based resin as bonded body and the film easily peeled off.(6) impact strength
Measure according to ASTM D1822-61T.
Embodiment 1
With density is 0.912g/cm
3, MFR be ethene-1-hexene copolymer of 2g/10 minute under 170 ℃ processing temperature, carry out film forming by the blown film method, on the polyamide film that stretches, glue together by dried interlayer.With its with (MFR (230 ℃ of mensuration) is 7.5g/10 minute by bonded propylene-ethylene random copolymers, ethylene contents is 4.5 weight %) after 500 microns compressing tablets forming seal under these conditions, other with above-mentioned same condition under measure density intensity.The results are shown in table 1.
Embodiment 2
Except adopting density is 0.905g/cm
3, MFR is that 2g/10 minute ethene-butene-1 copolymer replaces outside ethene-1-hexene copolymer of embodiment 1, other is to carry out similarly to Example 1.
Measurement result is listed in table 1.
Embodiment 3
Except adopting density is 0.908g/cm
3, MFR is that 2g/10 minute ethene-1-hexene copolymer replaces outside ethene-1-hexene copolymer of embodiment 1, other is to carry out similarly to Example 1.
Measurement result is listed in table 1.
Embodiment 4
Except adopting density is 0.921g/cm
3, MFR is that 2g/10 minute ethene-1-hexene copolymer replaces outside ethene-1-hexene copolymer of embodiment 1, other is to carry out similarly to Example 1.
Measurement result is listed in table 1.Comparative Examples 1
Except adopting density is 0.932g/cm
3, MFR is that 2g/10 minute ethene-1-hexene copolymer replaces outside ethene-1-hexene copolymer of embodiment 1, other is to carry out similarly to Example 1.
Measurement result is listed in table 1.
Embodiment 5
Except adopting density is 0.908g/cm
3, MFR is ethene-1-hexene copolymer that 2g/10 minute ethene-1-hexene copolymer replaces embodiment 1, the MFR of bonded body (230 ℃ of mensuration) is that other is to carry out similarly to Example 1 outside 8.5g/10 minute the Noblen.
Measurement result is listed in table 2.
Embodiment 6
Except adopting density is 0.905g/cm
3, MFR is that 2g/10 minute ethene-butene-1 copolymer replaces outside ethene-1-hexene copolymer of embodiment 5, other is to carry out similarly to Example 5.
Measurement result is listed in table 2.Comparative Examples 2
Except adopting density is 0.932g/cm
3, MFR is that 2g/10 minute ethene-1-hexene copolymer replaces outside ethene-1-hexene copolymer of embodiment 5, other is to carry out similarly to Example 5.
Measurement result is listed in table 2.
Embodiment 7
Except adopting density is 0.905g/cm
3, MFR is ethene-1-hexene copolymer that 2g/10 minute ethene-butene-1 copolymer replaces embodiment 1, (MFR (230 ℃ of mensuration) is 9g/10 minute and as bonded body and function propylene-ethylene block copolymer, ethylene contents is 2 weight %) outside, other is to carry out similarly to Example 1.
Measurement result is listed in table 3.
Embodiment 8
Except adopting density is 0.908g/cm
3, MFR be 2g/10 minute ethene-1-alkene copolymer replace outside ethene-butene-1 copolymer of embodiment 7, other is to carry out similarly to Example 7.
Measurement result is listed in table 3.Comparative Examples 3
Except adopting density is 0.932g/cm
3, MFR be 2g/10 minute ethene-1-alkene copolymer replace outside ethene-butene-1 copolymer of embodiment 7, other is to carry out similarly to Example 7.
Measurement result is listed in table 3.
Embodiment 9
Except adopting density is 0.900g/cm
3, MFR is ethene-1-hexene copolymer that 2g/10 minute ethene-butene-1 copolymer replaces embodiment 1, use MFR (230 ℃ of mensuration) to be 60g/10 minute as bonded body, contain outside the Noblen of titanium dioxide of 2.5 weight %, other is to carry out similarly to Example 1.
Measurement result is listed in table 4.
Embodiment 10
Except adopting density is 0.895g/cm
3, MFR is that 2g/10 minute ethene-butene-1 copolymer replaces outside ethene-butene-1 copolymer of embodiment 9, other is to carry out similarly to Example 9.
Measurement result is listed in table 4.Comparative Examples 4
Except adopting density is 0.890g/cm
3, MFR is that 1g/10 minute ethene-butene-1 copolymer replaces outside ethene-butene-1 copolymer of embodiment 9, other is to carry out similarly to Example 9.
Measurement result is listed in table 4.
Because surperficial seepage discharge is too much, does not present peel strength after heat-sealing.Table 1
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 Comparative Examples 1 bonded body propylene-ethylene random copolymers alpha-olefin contains C ' 6 C ' 4 C ' 6 C ' 6 C ' 6
Amount weight % 13.0 11.2 13.3 10.8 5.4 surperficial seepage discharge 00 0.02 00 mg/cm
2MFRg/10 minute 22222 density g/cm
30.912 0.905 0.908 0.921 0.932 impact strength, 1,500 1,300 1,770 1360 650kg.cm/cm
2Peel off 160 ℃ 880 1,730 1,580 950 820190 ℃ 1,070 2,280 2,150 1,020 900220 ℃ 990 2,050 2,130 1,030 82090 ° for sealing intensity g/15mm180 ° and peel off 60 ℃ of 410 2,280 1,570 340 310190 ℃ of 440 2,100 1,830 440 300220 ℃ of 540 1,830 1,760 470 310 tables 2
The equal copolymer alpha-olefin of embodiment 5 embodiment 6 Comparative Examples, 2 bonded body propylene contains C ' 6 C ' 4 C ' 6
Amount weight % 13.3 11.2 5.4 surperficial seepage discharge 0.02 0 0mg/cm
2MFRg/10 minute 222 density g/cm
30.908 0.905 0.932 impact strength, 1,770 1,300 650 kg.cm/cm
2Peel off 160 ℃ 1,560 1,400 510190 ℃ 1,670 1,650 650220 ℃ 1,820 1,620 92090 ° for sealing intensity g/15mm180 ° and peel off 160 ℃ 570 1,150 150190 ℃ 1,200 1,410 390220 ℃ of 1,200 1,860 350 tables 3
Embodiment 7 embodiment 8 Comparative Examples 3 bonded body propylene-ethylene block copolymer alpha-olefins contain C ' 4 C ' 6 C ' 6
Amount weight % 11.2 13.3 5.4 surperficial seepage discharge 0 0.02 0 mg/cm
2MFRg/10 minute 222 density g/cm
30.905 0.908 0.932 impact strength, 1,300 1,770 650 kg.cm/cm
2Peel off 160 ℃ 1,730 1,730 550190 ℃ 1,760 1,990 1010220 ℃ 1,900 1,870 91090 ° for sealing intensity g/15mm180 ° and peel off 160 ℃ of 1,570 630 170190 ℃ of 1,490 960 390220 ℃ of 1,750 1,150 380 table 4
The equal copolymer alpha-olefin of embodiment 9 embodiment 10 Comparative Examples, 4 bonded body propylene contains C ' 4 C ' 4 C ' 4
Amount weight % 13.6 14.0 16.0 surperficial seepage discharge 0.18 0 0.30 mg/cm
2MFRg/10 minute 221 density g/cm
30.900 0.895 0.890 impact strength, 800 1350 1000kg.cm/cm
2Peel off to peel off for 160 ℃ 800 1790 to peel off for 190 ℃ 1,490 1680 for sealing intensity g/15mm180 ° and peel off 90 ° for 220 ℃ 1,550 1770 and peel off to peel off for 160 ℃ 440 1730 to peel off for 190 ℃ 1,520 1550 and peel off for 220 ℃ 1,500 1530
Claims (5)
1. a film of easily peeling off is characterized in that, it is by the alpha-olefin that contains 7-20 weight %, and density is 0.892-0.925g/cm
3, the melt flow of measuring under 190 ℃, the loading condition of 2.16kg is made at the ethene-alpha-olefin copolymer of 0.1-40g/10 minute scope.
2. the described film of easily peeling off of claim 1 is characterized in that, the density of described ethene-alpha-olefin copolymer is 0.895-0.920g/cm
3, this alpha-olefin is that carbon number is the alpha-olefin of 3-12.
3. the described film of easily peeling off of claim 1, it is characterized in that, when to make thickness be 0.3 millimeter sheet material with described ethene-alpha-olefin co-polymer, 60 ℃, through 7 day time after, the exudate amount in the exudate of sheet surface except the additive-treated oil exudate is at 0.25mg/cm
2Below.
4. a film of easily peeling off is characterized in that it is made of multilayer film, and at least one superficial layer is any one described easy stripping film among the claim 1-3 in the described multilayer film.
5. a leakproofing material of easily peeling off is characterized in that, it is made of any one the described film easily peeled off and base material among the claim 1-4.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21267796A JPH1052897A (en) | 1996-08-12 | 1996-08-12 | Easily releasable film and easily releasable sealing material |
| JP212677/1996 | 1996-08-12 | ||
| JP212677/96 | 1996-08-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190074A CN1190074A (en) | 1998-08-12 |
| CN1070447C true CN1070447C (en) | 2001-09-05 |
Family
ID=16626586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97118509A Expired - Fee Related CN1070447C (en) | 1996-08-12 | 1997-08-12 | Strippable film and strippable packing material |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH1052897A (en) |
| CN (1) | CN1070447C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7871697B2 (en) * | 2006-11-21 | 2011-01-18 | Kraft Foods Global Brands Llc | Peelable composite thermoplastic sealants in packaging films |
| US7871696B2 (en) * | 2006-11-21 | 2011-01-18 | Kraft Foods Global Brands Llc | Peelable composite thermoplastic sealants in packaging films |
| JP2008138062A (en) * | 2006-12-01 | 2008-06-19 | Sekisui Film Kk | Peelable film and packaged material |
| CN101503537B (en) * | 2008-12-31 | 2013-10-02 | 浙江金石包装有限公司 | Easy-to-uncover heat sealable films special for sanitary bag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61246061A (en) * | 1985-04-25 | 1986-11-01 | 三井化学株式会社 | Sealed package |
| CN1091710A (en) * | 1993-02-05 | 1994-09-07 | 株式会社大制药工场 | Medical multilayer film and complex room container |
| JPH06328639A (en) * | 1993-05-26 | 1994-11-29 | Tonen Chem Corp | Easily peelable film for polypropylene vessel |
-
1996
- 1996-08-12 JP JP21267796A patent/JPH1052897A/en active Pending
-
1997
- 1997-08-12 CN CN97118509A patent/CN1070447C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61246061A (en) * | 1985-04-25 | 1986-11-01 | 三井化学株式会社 | Sealed package |
| CN1091710A (en) * | 1993-02-05 | 1994-09-07 | 株式会社大制药工场 | Medical multilayer film and complex room container |
| JPH06328639A (en) * | 1993-05-26 | 1994-11-29 | Tonen Chem Corp | Easily peelable film for polypropylene vessel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1052897A (en) | 1998-02-24 |
| CN1190074A (en) | 1998-08-12 |
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