CN104371597B - A kind of preparation method of multi-layer co-extruded barrier package polypropylene adhering resin - Google Patents
A kind of preparation method of multi-layer co-extruded barrier package polypropylene adhering resin Download PDFInfo
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- CN104371597B CN104371597B CN201410718722.0A CN201410718722A CN104371597B CN 104371597 B CN104371597 B CN 104371597B CN 201410718722 A CN201410718722 A CN 201410718722A CN 104371597 B CN104371597 B CN 104371597B
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- 229920001155 polypropylene Polymers 0.000 title claims abstract description 82
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 77
- -1 polypropylene Polymers 0.000 title claims abstract description 46
- 230000004888 barrier function Effects 0.000 title claims abstract description 38
- 239000011347 resin Substances 0.000 title claims abstract description 31
- 229920005989 resin Polymers 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 12
- 230000004048 modification Effects 0.000 claims abstract description 10
- 238000012986 modification Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 10
- 239000003381 stabilizer Substances 0.000 claims abstract description 10
- 238000007306 functionalization reaction Methods 0.000 claims abstract description 9
- 230000003647 oxidation Effects 0.000 claims abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 9
- 229920006132 styrene block copolymer Polymers 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005453 pelletization Methods 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000000178 monomer Substances 0.000 claims description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical class CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 2
- 239000003999 initiator Substances 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical class OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 claims description 2
- 229920005653 propylene-ethylene copolymer Polymers 0.000 claims description 2
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims description 2
- OKIRBHVFJGXOIS-UHFFFAOYSA-N 1,2-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC=CC=C1C(C)C OKIRBHVFJGXOIS-UHFFFAOYSA-N 0.000 claims 2
- 125000003342 alkenyl group Chemical group 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- ONJMNXFNTYIEEA-UHFFFAOYSA-N benzene ethene Chemical compound C1=CC=CC=C1.C=C.C=C.C=C ONJMNXFNTYIEEA-UHFFFAOYSA-N 0.000 claims 1
- 229920001400 block copolymer Polymers 0.000 claims 1
- 238000007334 copolymerization reaction Methods 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 claims 1
- 239000000806 elastomer Substances 0.000 claims 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229920005604 random copolymer Polymers 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 10
- 239000000853 adhesive Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 8
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 abstract description 6
- 239000004715 ethylene vinyl alcohol Substances 0.000 abstract description 4
- 239000004677 Nylon Substances 0.000 abstract description 2
- 229920001778 nylon Polymers 0.000 abstract description 2
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 49
- 239000000047 product Substances 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 5
- 230000032798 delamination Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011342 resin composition Substances 0.000 description 3
- 235000004348 Perilla frutescens Nutrition 0.000 description 2
- 244000124853 Perilla frutescens Species 0.000 description 2
- RWGFKTVRMDUZSP-UHFFFAOYSA-N cumene Chemical compound CC(C)C1=CC=CC=C1 RWGFKTVRMDUZSP-UHFFFAOYSA-N 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 229920002633 Kraton (polymer) Polymers 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000036299 sexual function Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920006300 shrink film Polymers 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a kind of polypropylene adhering resin for multi-layer co-extruded barrier package, its composition of raw materials includes（It is weight percentage below）：50% 80% atactic copolymerized polypropenes, 10% 30% functionalization and modification atactic copolymerized polypropenes, 10% 30% propylene-based elastomerics, 1% 10% styrene block copolymers, 0.01% 1% thermal oxidation stabilizers, implement plasticizing blending technology extruding pelletization using double screw extruder and are made.Adhering resin disclosed in this invention is used for polypropylene（PP）/ nylon（PA）Or polypropylene (PP)/ethylene-vinyl alcohol copolymer（EVOH）Multi-layer co-extruded barrier package film（Piece）Adhesive linkage, its processing characteristics is excellent, transparency is high, heat-resist, fisheye is few, and especially adhesive property is excellent, and a kind of bonding layer material well is provided for the multi-layer co-extruded barrier package field of polypropylene.
Description
Technical field
The invention belongs to polymer-function material field, it is related to hot melt adhesive technical field, more particularly to a kind of multilayer
The preparation method of co-extrusion barrier package polypropylene adhering resin, is mainly used as polypropylene (PP)/nylon (PA) or polypropylene
(PP) adhesive linkage of the multi-layer co-extruded barrier package film (piece) of/ethylene-vinyl alcohol copolymer (EVOH).
Background technology
In recent years, the ratio of plastic package material substitution conventional packaging material is growing at top speed always, with multi-layer co-extruded resistance
Every sexual function film (piece) packaging industry and food are increasingly received for the functional plastic packaging material of the high added value of representative
The favor of industry.
Multi-layer co-extruded technology refers to directly using more than three kinds of plastic pellet (or powder) as raw material, is squeezed by several
Go out machine makes after every kind of plastic molten melt plasticizing respectively, into same mouth mold (or by distributor, each extruder is supplied
Plastics converge after feed mouth mold), then through being processed further processing, be made multi-layer compound film.At present, manufacture
Two kinds of typical process of multi-layer co-extruded barrier composite membrane are respectively Multi-layer co-extrusion film-blowing and multi-layer co-extruded curtain coating.
Multi-layer co-extruded technology is effectively utilized characteristic and the mutual supplement with each other's advantages of different materials, substantially improves the items of product
Performance, such as barrier, sealing, corrosion-resistant, high temperature resistant, low temperature resistant, antibacterial, nontoxic, fresh-keeping performance.Current PP TYPE is main
For producing the fields such as barrier packaging film, shrink film, hollow preservative film, geomembrane, infusion bag.
Two major classes can be divided in the structure of PP TYPE:Symmetrical structure (i.e. A/B/A) and unsymmetric structure (i.e. A/B/C).
Current China's PP TYPE is in the majority with three layers and five layers of symmetrical structure.Here its structure, allusion quotation are illustrated by taking five-layer co-squeezing film as an example
The five-layer co-squeezing film of type is ABCBA structures, i.e. supporting layer/adhesive linkage/barrier layer/adhesive linkage/supporting layer.Wherein, exemplary support
Layer is PP or PE, and barrier layer is PA or EVOH or PVDC, and adhesive linkage is from polypropylene adhering resin (supporting layer is PP) or poly-
Ethylene type adhering resin (supporting layer is PE).By support layer material species, it can often be divided into polypropylene PP TYPE and poly- second
Alkene PP TYPE.
Bonding is a key technology in multi-layer co-extruded technology, so the bonding layer material in its structure (i.e. set by bonding
Fat) it is particularly important.When adhesive strength is inadequate, when during producing PP TYPE or by vacuumizing stretch package
Delamination just occurs in co-extrusion film, has a strong impact on product quality and productivity effect.At present, using polypropylene PP TYPE
Or polyethylene PP TYPE is when being packaged with commodity (such as trotter, beefsteak and the electric PC board) of corner angle, logical
Cross when vacuumizing stretching process and delamination often occur at its angular edge, illustrate that the bonding of adhering resin at angular edge is strong
Degradation or forfeiture caused by the tension and strain facies of interlayer are to excessive when vacuumizing stretching are spent, therefore, to existing
The polypropylene adhering resin and polyethylene adhering resin used in technology proposes higher requirement.
The content of the invention
In order to overcome above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of multi-layer co-extruded barrier package
Polypropylene adhering resin is used, its processing characteristics is excellent, transparency is high, heat-resist, fisheye is few, and especially adhesive property is excellent
It is different, provide a kind of bonding layer material well for the multi-layer co-extruded barrier package field of polypropylene.
Another object of the present invention is to provide the preparation of above-mentioned multi-layer co-extruded barrier package polypropylene adhering resin
Method.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of polypropylene adhering resin for multi-layer co-extruded barrier package, it (is below weight that its composition of raw materials, which includes,
Percentage composition)：50%-80% atactic copolymerized polypropenes, 10%-30% functionalization and modifications atactic copolymerized polypropene, 10%-30%
Propylene-based elastomeric, 1%-10% styrene block copolymers, 0.01%-1% thermal oxidation stabilizers.
Further, the above-mentioned polypropylene adhering resin for multi-layer co-extruded barrier package, its composition of raw materials include (with
It is weight percentage down)：55%-70% atactic copolymerized polypropenes, 15%-25% functionalization and modifications atactic copolymerized polypropene,
10%-20% propylene-based elastomerics, 1%-5% styrene block copolymers, 0.05%-0.5% thermal oxidation stabilizers.
A kind of preparation method of polypropylene adhering resin for multi-layer co-extruded barrier package is to be formulated above-mentioned raw materials
Each component according to the above ratio, using double screw extruder implement plasticizing blending technology extruding pelletization.
By above-mentioned technical proposal, the beneficial effects of the invention are as follows：
The multi-layer co-extruded barrier package polypropylene adhering resin of the present invention, its processing characteristics is excellent, transparency is high, resistance to
Hot good, fisheye is few, and especially adhesive property is excellent, is that polypropylene (PP) is Nian Jie strong with barrier layer (EVOH or PA), supporting layer
Degree height and lasting stability, can use Multi-layer co-extrusion film-blowing or multi-layer co-extruded casting technique technology to be made and be used as supporting layer using polypropylene
Polypropylene PP TYPE, provide a kind of good adhesive linkage material for the multi-layer co-extruded barrier package field of polypropylene
Material, solves and is packaged with what the commodity of corner angle existed after stretching is vacuumized at angular edge using polypropylene PP TYPE
Delamination problems, greatly improved product quality and productivity effect.
Embodiment
Below by specific embodiment, the present invention is described in further detail, but the present invention is not limited to following reality
Apply example.
Multi-layer co-extruded barrier package polypropylene adhering resin of the present invention, its composition of raw materials is including (being below
Weight percentage)：50%-80% atactic copolymerized polypropenes, 10%-30% functionalization and modifications atactic copolymerized polypropene, 10%-
30% propylene-based elastomeric, 1%-10% styrene block copolymers, 0.01%-1% thermal oxidation stabilizers.
The preparation method of the polypropylene adhering resin of above-mentioned multi-layer co-extruded barrier package be by above-mentioned raw materials be formulated it is each
Component according to the above ratio, plasticizing blending technology extruding pelletization is implemented using double screw extruder.
Above-mentioned atactic copolymerized polypropene is the copolymer of propylene and a- alkene, and density is 0.88-0.92g/cm3, melting refers to
Number is 3-15g/10min.
Above-mentioned functionalization and modification atactic copolymerized polypropene is using maleic anhydride as functional graft's modified monomer, to aoxidize two
Isopropylbenzene or double (tert-butyl peroxide) hexanes of 2,5- dimethyl -2,5- are initiator, implement to react using double screw extruder
Prepared by extruding graft technology, its grafting rate is calculated as 0.6%-1.3% in mass ratio.
Aforesaid propylene based elastomeric is propylene-ethylene copolymers, and propylene monomer content is big in its component, and density is
0.85-0.90g/cm3。
Above-mentioned styrene block copolymer is SEBS or SEPS, and (Kraton) or Kuraray are risen by such as section of the U.S.
(Kuraray) the related series of products of company.
Above-mentioned thermal oxidation stabilizer is hindered phenol type pentaerythritol esters.
Above-mentioned double screw extruder draw ratio L:D≥40:1,150-230 DEG C of extrusion processing temperature scope.
Embodiment 1
(following proportioning is weight percent to the composition of raw materials of multi-layer co-extruded barrier package polypropylene adhering resin composition
Than content) it is as follows：
69% atactic copolymerized polypropene
15% functionalization and modification atactic copolymerized polypropene
13% propylene-based elastomeric
3% styrene block copolymer
0.08% thermal oxidation stabilizer
Above-mentioned each component is implemented into plasticizing blending technology extruding pelletization, the draw ratio L/ of extruder using double screw extruder
D=40:1, processing temperature is 150-230 DEG C, and the multi-layer co-extruded barrier package polypropylene adhering resin of the present invention is made.
Embodiment 2
(following proportioning is weight percent to the composition of raw materials of multi-layer co-extruded barrier package polypropylene adhering resin composition
Than content) it is as follows：
65% atactic copolymerized polypropene
18% functionalization and modification atactic copolymerized polypropene
15% propylene-based elastomeric
2% styrene block copolymer
0.1% thermal oxidation stabilizer
Above-mentioned each component is implemented into plasticizing blending technology extruding pelletization, the draw ratio L/ of extruder using double screw extruder
D=40:1, processing temperature is 150-230 DEG C, and the multi-layer co-extruded barrier package polypropylene adhering resin of the present invention is made.
Embodiment 3
(following proportioning is weight percent to the composition of raw materials of multi-layer co-extruded barrier package polypropylene adhering resin composition
Than content) it is as follows：
60% atactic copolymerized polypropene
20% functionalization and modification atactic copolymerized polypropene
18% propylene-based elastomeric
2% styrene block copolymer
0.12% thermal oxidation stabilizer
Above-mentioned each component is implemented into plasticizing blending technology extruding pelletization, the draw ratio L/ of extruder using double screw extruder
D=40:1, processing temperature is 150-230 DEG C, and the multi-layer co-extruded barrier package polypropylene adhering resin of the present invention is made.
By the product forming polypropylene type five-layer co-squeezing film 1 of embodiment 1, the product of embodiment 2 is molded five-layer co-squeezing film 2,
Three kinds of co-extrusion films are carried out the T-shaped stripping of transparency, fisheye number, interlayer strong by the product shaping five-layer co-squeezing film 3 of embodiment 3 respectively
Spend and there is delamination at its angular edge of the commodity of corner angle to detect by vacuumizing stretch package.Acquired results are as shown in table 1.
The performance test results of 1. 3 kinds of co-extrusion films of table
Note：Table 1 have corner angle commodity 1 refer to beefsteak, have corner angle commodity 2 refer to electric PC board.
As it can be seen from table 1 the adhering resin that the present invention is provided can be used for the multi-layer co-extruded barrier package material of polypropylene
The adhesive linkage of material, the adhering resin has that processing characteristics is excellent, transparency is high, heat-resist, fisheye is few, especially adhesive property
It is excellent, solve and be packaged with the presence at angular edge after stretching is vacuumized of the commodity of corner angle using polypropylene PP TYPE
Delamination problems, product quality and productivity effect greatly improved.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements done within refreshing and principle etc., should be included in the scope of the protection.
Claims (8)
1. a kind of multi-layer co-extruded barrier package polypropylene adhering resin, it is formulated includes with the following group count by weight percentage
Point：
Atactic copolymerized polypropene 55-70%
Functionalization and modification atactic copolymerized polypropene 15-25%
Propylene-based elastomeric 10-20%
Styrene block copolymer 1-5%
Thermal oxidation stabilizer 0.05-0.5%.
2. multi-layer co-extruded barrier package polypropylene adhering resin according to claim 1, it is characterised in that：Above-mentioned
Atactic copolymerized polypropene is the random copolymer of propylene and a- alkene, and density is 0.88-0.92g/cm3, melt index is 3-
15g/10min。
3. multi-layer co-extruded barrier package polypropylene adhering resin according to claim 1, it is characterised in that：Above-mentioned official
It is using maleic anhydride as functional graft's modified monomer, to aoxidize diisopropylbenzene (DIPB) or 2,5- bis- that modified random copolymerization polypropylene, which can be changed,
Double (tert-butyl peroxide) hexanes of methyl -2,5- are initiator, and reactive extrusion technology system is implemented using double screw extruder
Standby, its grafting rate is calculated as 0.6%-1.3% in mass ratio.
4. multi-layer co-extruded barrier package polypropylene adhering resin according to claim 1, it is characterised in that：Above-mentioned third
Alkenyl elastomer is propylene-ethylene copolymers, and propylene monomer content is big in its component, and density is 0.85-0.90g/cm3。
5. multi-layer co-extruded barrier package polypropylene adhering resin according to claim 1, it is characterised in that：Above-mentioned benzene
Ethene based block copolymer is SEBS or SEPS.
6. multi-layer co-extruded barrier package polypropylene adhering resin according to claim 1, it is characterised in that：Above-mentioned heat
Oxygen stabilizer is hindered phenol type pentaerythritol esters.
7. a kind of multi-layer co-extruded barrier package as described in claim 1 to claim 6 any one is bonded with polypropylene
The preparation method of resin, it is characterised in that：Plasticizing blending technology extruding pelletization is implemented using double screw extruder.
8. the preparation method of multi-layer co-extruded barrier package polypropylene adhering resin according to claim 7, its feature
It is：The draw ratio L of above-mentioned double screw extruder:D≥40:1,150-230 DEG C of extrusion processing temperature scope.
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| CN105109830A (en) * | 2015-08-11 | 2015-12-02 | 福建农林大学 | Packaging method for adult monochamus alternatus attractant lure core |
| CN105567135A (en) * | 2015-12-31 | 2016-05-11 | 广州鹿山新材料股份有限公司 | Polypropylene adhesive powder for anticorrosion pipelines and preparation method thereof |
| CN107033810B (en) * | 2017-06-05 | 2019-01-04 | 厦门内加湖新材料科技有限公司 | Adhesive alpha-olefin inter |
| CN109796912B (en) * | 2018-12-27 | 2022-03-11 | 广州鹿山新材料股份有限公司 | Modified polypropylene hot melt adhesive and preparation method thereof |
| CN111117524B (en) * | 2019-12-30 | 2021-12-07 | 河源市普立隆新材料科技有限公司 | Adhesive resin for aluminum ceiling |
| CN112126364A (en) * | 2020-09-21 | 2020-12-25 | 广东东立新材料科技股份有限公司 | Adhesive layer composition, self-adhesive film and application thereof |
| CN114045127B (en) * | 2021-11-24 | 2023-04-21 | 合诚技术股份有限公司 | Adhesive resin for soft package lithium ion battery aluminum plastic film, and preparation method and application thereof |
| CN114032049B (en) * | 2021-11-30 | 2022-09-16 | 合诚技术股份有限公司 | Hot melt adhesive for high-performance polypropylene barrier film and preparation method and application thereof |
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|---|---|---|---|---|
| CN101426877A (en) * | 2002-10-28 | 2009-05-06 | 博斯蒂克芬德利公司 | Hot melt adhesive composition based on a random copolymer of isotactic polypropylene and a secondary polymer |
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