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PVDC latex
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Asahi Kasei PVDC Latex
What it is.
Main applications.
Reasons for use.
Types of film coated.
Coating methods.
Preparation of film for coating.
Means of obtaining maximum effect.
Applications other than film coating.
Shipping containers.
Asahi Kasei PVDC Resin
What it is.
Main applications.
Main advantage over PVDC latex.
Use of additives.
Post-application aging.
Asahi Kasei PVDC Latex
What is PVDC latex?
It is an aqueous emulsion of a copolymer, produced by emulsion polymerization of VDC (vinylidene chloride) and one or more other monomers.
What are the main applications for Asahi Kasei PVDC Latex?
It is most widely used as a coating on packaging films for food products ranging from hams, sausages, and pickled vegetables to instant ramen noodles, candy, and pastries, and on blister-pack films for non-prescription and prescription pharmaceuticals.
Why is Asahi Kasei PVDC Latex used to coat food-packaging and blister-pack films?
It forms a highly effective “barrier layer” that prevents permeation by water vapor and gases, thus protecting and preserving the packaged products. It also provides better resistance to chemicals and oils.
What kinds of film are coated with Asahi Kasei PVDC Latex?
It is widely used to coat films made from oriented polypropylene (OPP), polyethylene terephthalate (PET), nylon (NY), and polyvinyl chloride (PVC).
What methods are generally used to coat films with Asahi Kasei PVDC Latex?
It is generally applied by air-knife or gravure coating processes.
Can Asahi Kasei PVDC Latex be coated directly on film?
For good adhesion, the film surface should be prepared by corona treatment and anchor coating application, before applying Asahi Kasei PVDC Latex.
What measures are advisable to obtain the full effects of Asahi Kasei PVDC Latex?
Aging the coat following its application, typically at about 40°C for 48 hours, promotes its optimal crystallization and therefore maximizes its barrier properties.
What are some other uses of Asahi Kasei PVDC Latex, in addition to film coating?
Major applications include the impregnation of polyurethane foam for heat-sealing in automotive interior components, the binding of PVC and PVDC fibers in filters for air conditioning and water treatment, the coating of paper and cellophane for moisture resistance, and the coating of metals to prevent rust.
What kind of containers are used to ship Asahi Kasei PVDC Latex?
It is generally shipped in 1,200-kg IBCs (Intermediate bulk containers) for volume use, and in 250-kg plastic drums and 20-kg metal cans primarily for trial use.
Asahi Kasei PVDC Resin
What is Asahi Kasei PVDC Resin?
It is a thermoplastic resin in the form of a white powder, containing polyvinylidene chloride as its main constituent. In use, it is dissolved in organic solvents and then applied in solution form.
What are the main applications for Asahi Kasei PVDC Resin?
It is generally used to coat packaging films for food products, with the same basic performance for essentially the same range of food products as Asahi Kasei PVDC Latex.
What is the main advantage of Asahi Kasei PVDC Resin over the Latex?
It can provide film coatings with the same properties and characteristics, using a smaller quantity of the constituent polymer.
Are any additives used in coating films with Asahi Kasei PVDC Resin?
An adhesive agent is generally added to the organic solvent/PVDC resin solution, to obtain the necessary adhesive strength in the film coating. Lubricating, antistatic, or other agents may also be added, as required for specific applications.
Is aging effective for coatings obtained with Asahi Kasei PVDC Resin?
Yes. Post-application aging can be employed in the same manner as for the PVDC latex, to maximize the barrier effect and other properties.
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