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< 1.About PVDC LATEX>

(1)Characteristic Properties of PVDC LATEX
PVDC LATEX is obtained by emulsion polymerization of vinylidene chloride and other monomers.The coated film of PVDC Latex demonstrates the following excellent properties.



(2) Applications of PVDC LATEX
  1. Film coatings
    Coating PVDC LATEX on OPP, PET, nylon, cellophane, etc. significantly improves the gas barrier property and moisture proof property of the base material, and thus can remarkably extend the shelf life of foods, pharmaceuticals, and other products which are wrapped in these films.In addition, improved resistance to oil and chemicals can be expected, and it is also possible impart an appropriate heat sealing property when necessary.
  2. Paper coatings
    Coating PVDC LATEX on Kraft paper, fine paper, glassine paper, etc.gives the paper an excellent gas barrier property, water proof and moisture proof property, high level oil resistance, and appropriate heat sealability.At the same time, a desirable, high quality appearance can also be obtained thanks to the high gloss of PVDC LATEX.
  3. Binder for PVDC fiber
    PVDC LATEX is used widely as the binder for PVDC fiber. They are employed in various types of filters that require resistance to water, oil, and chemicals, and in household scrubbing brushes, etc.
  4. Impregnation in urethane foam
    Impregnating PVDC LATEX in urethane foam or coating it on the foam gives excellent microwave sealability.Urethane foam which is impregnated with PVDC LATEX is used in interior materials of the automotive.
  5. Flame retardant binders and back sizing
    Coating with PVDC LATEX or impregnating PVDC LATEX in fabrics, non-woven fabrics, paper, leather, etc. imparts an excellent self-extinguishing property and microwave sealability.When used with various types of flame retardant agents, the flame retarding effect is amplified a further degree in comparison with other types of LATEX.

(3)Barrier property (comparison with un-coated films)
Films coated with PVDC LATEX show low oxygen permeability, low water vapor permeability in comparison with un-coated films.

< Oxgen and water vapor permeability of various films >

Type of film

Thickness
(μm)

Oxygen permeability 2)
(cc/m2·atm·24Hr)

Water vapor 3)
(g/m2·24Hr)

PVDC coated OPP 1)

23

4

4

OPP

20

1300

7~8

Nylon

15

80

300

PET

12

80

45

Cellophane

(No. 300)

1000 or over

1000 or over

LDPE

40

2000

9~12

HDPE

40

1500

3~6

CPP

40

2000

6~12

Notes)
  1. PVDC coated OPP is a material in which a 3 μ m thickness of Asahi Kasei PVDC LATEX L803 is coated on OPP (20μm).
  2. Oxygen permeability was measured at a temperature of 20 and RH of approximately 70% in accordance with the JIS K 7126 B method.
  3. Water vapor permeability was measured at a temperature of 40 and RH of 90% in accordance with JIS K 7129.


(4)Barrier property (comparison with other barrier packaging materials)
Films coated with PVDC LATEX show little dependence of barrier property on humidity, and thus demonstrate and an excellent barrier property even under high humidity conditions.
In the case of films deposited with aluminum or ceramic, there is capability that the barrier property may be markedly reduced by the occurrence of microcrack in the deposited layer during processing of the film.
On the other hand, films coated with PVDC LATEX have only small influence during processing of film and show stable barrier property.
In addition, through the packaging films coated with PVDC LATEX the contents can be seen.
< Comparison of various barrier packaging materials >

 

Barrier property under high humidity

Suitability for processing

Transparency

Suitability for metal detectors

Economy

PVDC coated OPP

Other barrier type resin (EVOH or PVA etc.)

×

Aluminum foil

×

×

×

Aluminum metallized film

×

×

Transparent (ceramic type) vapour deposition

×

×


(5) Resistance to oils and chemicals
The oil and chemical resistance of coated layer with PVDC LATEX is as shown in the following table, which indicates that PVDC LATEX coating can withstand a wide range of chemicals.

Oil and chemical resistance of PVDC LATEX (Source: Catalog of Dow Chemical Co.)
Oil or chemical Stability
Linseed oil
Acetone
Ammonia 28%
Ammonia 10%
Ethyl alcohol
Ethyl ester
Hydrochloric acid 65%
Hydrochloric acid 10%
Ortho dichlorobenzene
Caustic soda 50%
Caustic soda 10%
Glacial acetic acid
Acetic acid 10%
Ethyl acetate

Excellent
Fair
Unacceptable
Unacceptable
Excellent
Poor
Excellent

Excellent

Poor

Good
Good
Excellent
Excellent
Fair

 
Oil or chemical Stability
Dioxane
Carbon tetrachloride Lubricating oil
Turpentine
Nitric acid 65%
Nitric acid 10%
Ethane dichloride
Benzene
Water
Methyl isobutyl ketone
Sulfuric acid 98%
Sulfuric acid 60%
Sulfuric acid 30%
Iron sulfate 15%

Unacceptable
Good
Excellent
Excellent
Good
Excellent
Fair
Fair
Excellent
Fair

Fair
Excellent
Excellent
Good
(Remarks)
Rankings of stability are based on the results of an overall evaluation of changes in color, weight, dimensions, elongation, and toughness. The order of rankings is:
Excellent > Good > Fair > Poor > Unacceptable

< 2. About PVDC Coated Films >

(1) Applications in Japan
PVDC coated films are used in wide range of applications, taking advantage of their excellent barrier property, flexibility, transparency, and heat sealability. Actual examples of the uses of PVDC coated films are shown in the following table.

Actual examples of packaging using PVDC coated films
  Structure of film Example of application Function of PVDC
PVDC coated OPP PVDC coated OPP/PE/LLDPE
PVDC coated OPP/PE/EVA
PVDC coated OPP (Both surface)
Wieners, rice cookies, chocolate confectioneries
Pickles, devil’s tongue, dried foods
Cigarettes, candy

Oxygen gas barrier property
Moisture proof property
Odor proof property
Film processing property
High packaging suitability
Heat sealability

PVDC coated PET PVDC coated PET
PVDC coated PET/CPP
PVDC coated PET/PE/EVA
Cheese
Hamburgers, meat dumplings
Instant noodle
PVDC coated ONY PVDC coated ONY/LLDPE




PVDC coated ONY/CPP

Boiled foods, pickled (salted) vegetables, fresh confectioneries, marine products (milled products)
rice cake
miso


Processed animal products
PVDC coated Cellophane PVDC coated Cellophane/PE
PVDC coated Cellophane
Pouches for pharmaceuticals
Candies

< 4. Precautions in Handling Asahi Kasei PVDC LATEX >
This part describes the main precaution on the occasion of using Asahi Kasei PVDC LATEX.
Before using PVDC LATEX actually, see the MSDS of the PVDC LATEX grade and confirm the protective instrument and the observable matter.

(1) Properties of Asahi KASEI PVDC LATEX
Both in the LATEX form and after coating, Asahi Kasei PVDC LATEX shows changes in the degree of crystallization of the resin due to temperature and time, and these changes have an extremely serious effect on the coating conditions and the properties of the film. For this reason, control of the storage of the LATEX, control of coating conditions, aging of the film after coating, etc. become important.

(2) Storage Temperature
Asahi Kasei PVDC LATEX should be stored in an indoor warehouse which can be maintained at a temperature of 3-30 ℃ . At temperatures of 0 ℃ or under, the product will freeze, and cannot be use even if thawed again. If the product is stored for a long period exposed to high temperature or direct sunlight, various problems ,such as precipitation, solidification etc., tend to occur easily.

(3) Storage Time
This product should be used quickly, because various problems, such as poor film formation, precipitation, coagulation, etc., may occur if Asahi Kasei PVDC LATEX is stored for a long period.

(4) Transport
Because Asahi Kasei PVDC LATEX may coagulate due to violent stirring or friction (with the vanes and gland seal part of volute pumps, etc.), it should be transported by gravity or air pressure, or by a liquid transport pump with the lowest possible shear.

(5) Foaming
Because foaming will occur if Asahi Kasei PVDC LATEX is dripped from a high location or is violently stirred and time and trouble will be required to eliminate the bubbles, consideration should be given as much as possible to locating the liquid outlet near the bottom of the container, along the container wall, etc. Further, if drying occurs before the bubbles are completely eliminated, powdery coagulated materials will form and become mixed with the LATEX. For this reason, a filter with a pore size of approximately 100 μ m should be installed before the coating pan.

(6) Material of Container
Asahi Kasei PVDC LATEX is acidic (pH=1~5), containing hydrochloric acid. Therefore, polyethylene, polyvinyl chloride, or epoxy resin lined steel, FRP, glass lined steel, SUS316 stainless steel, etc. should be used. Because the LATEX will coagulate if iron or aluminum is used, these materials absolutely must not be used in piping, joints, tanks, and other parts which come into contact with the LATEX.

(7) Mixing of LATEX
Coagulation may occur if PVDC LATEX is mixed with other types of LATEX. When some different type of Latexes are used in the same equipments, the equipments should be fully washed before changing the type of LATEX. If there is a possibility of mixing, it is necessary to confirm whether LATEX will coagulate or not after mixing. At the same time, ingenuity should be used in order to avoid mixing as much as possible.

(8) Mixing of Additives, Etc.
When using with additives, etc., do not fail to perform a test with spare material and confirm in advance that there will be no abnormalities such as changes in viscosity over time, precipitation, etc.

(9) Dilution
When using Asahi Kasei PVDC LATEX by dilution with water, use water with a hardness of 300 ppm or less in order to avoid partial coagulation.

(10) Cleaning of Tools and Equipment
If tools, equipment, etc. which are used in handling Asahi Kasei PVDC LATEX are left unwashed, a resin film will form, hindering the next use. Therefore, equipment should be washed with water immediately after use. If dried resin has adhered to equipment, wash with tetrahydrofuran (boiling point, 66 ℃ , flammable). When using solvents, work should be performed wearing protectors, with adequate ventilation and consideration given to the danger of toxicity and fire. When removing dried resin which has adhered to the coater rolls and other important parts, the resin can be removed easily by using a soft metal brush and wooden spatula or hard nylon brush which will not scratch, and finally wiping with a solvent (tetrahydrofuran).

 

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