JPS62130875A - Print protective member - Google Patents

Abstract

PURPOSE:To provide a print protective member having favorable folding endurance and anti-blocking property and excellent transferability onto a recorded image surface, adhesiveness to the surface and productivity, by providing a transfer layer with a multilayer construction comprising a solvent type thermoplastic resin and an aqueous type thermoplastic resin, in a print protective member comprising a base and the transfer layer releasably provided on the base. CONSTITUTION:A base 1 may be a paper, a fabric, a plastic film or the like. A resin constituting a lower layer 2 is preferably a solvent type thermoplastic resin such as a butyral resin, a polyester resin and an acrylic resin. An upper layer 3 is laminated, in close contact, on the lower layer 2, and is formed of an aqueous type thermoplastic resin capable of imparting water resistance, abrasion resistance, solvent resistance or the like to recorded images. The aqueous type thermoplastic resin may be an aqueous type olefin resin such as a dispersion or emulsion of polyethylene, an ethylene-vinyl acetate copolymer and an ionomer resin. This print protective member is excellent in transferability onto the recorded images, adhesiveness to the printed images and has favorable productivity.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the lamination processing of prints formed by recording images on paper etc. by a recording method using a recording liquid, particularly an inkjet recording method. The present invention relates to a print protection member suitable for use as a print protection member.

[Conventional technology]

The inkjet recording method is a recording method in which small droplets of recording liquid are deposited onto a recording material such as paper from the orifice of the recording head, and it generates little noise and does not require special fixing treatment. It is attracting attention as a recording method that can perform high-speed recording and full-color recording.

The recording liquid used in this ink shed recording method is as follows:
It is generally formed from a recording agent such as a dye and water as a solvent or a mixture of water and various solvents.

As described above, since an aqueous recording liquid is used in the inkjet recording method, the recording material used for recording is required to have excellent recording liquid absorption and fixing properties.

In particular, in multicolor inkjet recording using recording liquids of two or more colors, the amount of recording liquid that adheres to the recording material increases.
Particularly excellent recording liquid absorption and fixing properties are required.

As a recording material lacking such characteristics, there is known a recording material such as paper provided with a recording liquid receiving layer made of a porous material having excellent recording liquid absorption and fixing properties.

On the other hand, in the case of a recording material that has a porous recording liquid receptive layer, the surface of the recording material lacks glossiness, and even if the image is clearly recorded, it has the disadvantage of impairing the sharpness of the image when viewed with the naked eye. This has become a problem to be solved, particularly when a multicolor image is recorded by an inkjet recording method to form a color print.

Moreover, in the prints formed in this way,
Since water-soluble dyes are mainly used as recording agents, the water resistance, solvent resistance, and abrasion resistance of recorded images have not always been sufficient.

Therefore, in order to impart gloss, water resistance, solvent resistance, and abrasion resistance to recorded images, lamination processing has been performed on the printed surface.

Lamination processing involves attaching a print protection member, which is made by carrying a transfer material mainly made of thermoplastic resin such as acrylic resin, polystyrene resin, polyester resin, or polyethylene, onto a base material such as paper, cloth, or plastic film, on the printed surface. A method of applying gloss, water resistance, solvent resistance, and abrasion resistance to the print surface by bringing the transfer material side into close contact with the material and press-bonding the material, and then separating the base material and leaving the transfer material to remain on the recording material. It is.

At this time, the thermoplastic resin used for the transfer material has anti-blocking properties that will not block the stacking of multiple laminated prints when storing and transporting them, and the ability to prevent laminated prints from being bent while being handled. At the same time, the transfer material must also satisfy performance requirements such as folding durability so that the transfer material is not destroyed.

Furthermore, the transfer material after lamination must have sufficient adhesive strength with the printed surface.

At present, a print protection member that satisfies all of these characteristics has not yet been obtained.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above problems, and provides water resistance, solvent resistance, abrasion resistance, and gloss to recorded images obtained using a recording liquid, and improves bending resistance and blocking resistance. It is an object of the present invention to provide a print protection member that has good properties, excellent transferability and adhesion to an image forming surface, and excellent processing productivity.

[Means for solving problems]

The above object is achieved by the present invention as follows.

That is, the present invention provides a print protection member having a base material and a transfer layer removably provided on the substrate, wherein the transfer layer has a multilayer structure containing at least a solvent-based thermoplastic resin and a water-based thermoplastic resin. This is a print protection member characterized by:

[Effect]

The print member of the present invention is characterized in that it consists of a base material and a transfer layer, and the transfer layer contains at least a solvent-based thermoplastic resin and a water-based thermoplastic resin. In a particularly preferred embodiment, the transfer layer has two layers. The substrate side layer contains a solvent-based thermoplastic resin, and the other layer contains a water-based thermoplastic resin.

Hereinafter, the print protection member of the present invention will be explained with reference to FIG.

Examples of the base material 1 include paper, cloth, and plastic films, and if desired, those coated with a release treatment agent having various release properties such as silicone resin, polyester resin, and thermosetting resin on the surface are suitable. Alternatively, a film that itself has peelability, such as a Mylar film or a polypropylene film, may be used.

Among these base materials, paper coated with a release treatment agent having various release properties such as silicone resin, polyester resin, thermosetting resin, etc. is particularly good because it is easy to distinguish it from the transfer resin layer when it is peeled off. The thickness of the base material 1 is preferably 5 to 2000 gm, more preferably 10 to 500 gm.

The transfer layer 4 consists of an upper layer 3 and a lower layer 2. The lower layer 2 is a layer that is in contact with the base material, and is a layer that comes to the surface when the transfer layer is transferred to a print.

÷ The resin constituting the lower layer 2 is preferably a solvent-based thermoplastic resin such as a butyral resin, a polyester resin, or an acrylic resin, and a butyral resin is particularly preferred.

Among butyral resins, the average degree of polymerization is 150 to 9.
00. Butyralization degree (butyral group mo1%) is 60
Those above are preferable, especially the average degree of polymerization is 200 to 200.
700. The average degree of polymerization of petitral butyral resin is 150
If it is less than 900, the folding durability and blocking resistance will be poor, and if it exceeds 900, the thermal melting property will decrease, resulting in poor transferability.

Moreover, if the degree of butyralization is less than 60, the #-foldability will be poor, which is not preferable.

As a combination system of butyral resin forming the lower layer of this transfer layer, reactants such as melamine resin, phenol resin, epoxy resin, incyanate, dialdehyde and/or melamine resin, phenol resin, epoxy resin, urethane resin, urea resin, Alcohol resistance can be improved by using alkyd resin, cellulose resin, vinyl resin, etc.

In addition, waxes, plasticizers, ultraviolet absorbers, light stabilizers, etc. may be added as necessary, especially:
A small amount of plasticizer is preferred since it improves folding durability.

The solvent for dissolving and laminating the above solvent-based thermoplastic resin on the substrate l includes propyl alcohol, butanol,
Examples include toluene, ethyl acetate, methyl ethyl ketone, aromatic esters, and ketones.

The thickness of the lower layer 2 is preferably 1 to 50 gm, preferably 3 gm.
~30ILm.

The lower layer 2 is attached to the base material 1 so that it can be peeled off from the base material 1 when the transfer layer is transferred and laminated on the recorded image screen of a print on which an image is formed using a recording liquid on a recording material such as paper. It is carried.

The upper layer 3 is laminated in close contact with the lower layer 2, and is an aqueous layer that can be laminated with sufficient adhesive force on the surface of the recorded image surface and can impart properties such as water resistance, abrasion resistance, and solvent resistance to the recorded image. Composed of thermoplastic resin.

Examples of water-based thermoplastic resins include vinyl acetate resin and its derivatives, polyethylene, ethylene-vinyl acetate copolymer,
Examples include ionomer resins, acrylic resins, polystyrene and its copolymers, polyisobutylene, hydrocarbon resins, polypropylene, polyethylene-polypropylene copolymer elastomers, polyamide resins, polyester resins, polyurethane resins, etc., but particularly preferred are dispersions. and water-based olefin resins such as emulsion-based polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, and polyethylene-polypropylene copolymer elastomer.

Various additives such as surfactants, plasticizers, and tackifiers are added to the upper layer 3 as necessary.

The thickness of the northern layer 3 is preferably 1 to 50 m, preferably 3 m.
~30 pots m.

The print protection member of the present invention having such a structure is made of the above-mentioned base material and the material capable of forming the transfer layer, and has the following properties: A material for forming a transfer layer is laminated on the selected Omurakami using a known method such as barcode coating, blade coating, reverse roll coating, gravure roll coating, etc. It can be easily formed by

Note that the print protection member of the present invention protects one side of the print (
It is suitable for laminating only the image surface), so
If the transfer layer is attached to the print by heat treatment, the shrinkage rate of the transfer layer due to temperature changes after heat treatment is the same as the shrinkage rate of the print, or the shrinkage of the transfer layer causes lamination to occur. It is preferable that the print be formed to such a degree that curling will not occur in the printed print.

〔Example〕

Examples 1 to 7 and Comparative Examples 1 to 4 are summarized in Table-1.

The evaluation results are summarized in Table 2. Evaluation was performed on the following items.

Folding durability: Print durability [1 material was transferred to inkjet coated paper, a peeled sample was bent 180°, and evaluated by whether or not any bent portion remained.

Table 2 Blocking Resistance According to JISZO219 "Adhesive Resistance Test for Processed Paper for Packaging", those that did not cause any blocking were marked as O, and those that did not were marked as ×.

Transferability: After transferring the print protection member to inkjet coated paper, when the base material of the print protection member is peeled off by hand, can it be peeled off smoothly without problems such as snagging or destruction of the coat layer during the process? It was evaluated by

Adhesion: In a 90' peel test between the transfer layer of the sample and coated paper after transfer separation, evaluation was made based on whether the adhesion was strong enough to cause destruction of the coated paper base material.

Productivity: The ease of adjusting the film thickness during production of the print protection member was evaluated.

In the Examples and Comparative Examples, PET film coated process paper was used as the base material of the print protection member.

〔effect〕

As described in detail above, by using the print protection member of the present invention, recorded images can be obtained that have any desired gloss, and have excellent foldability, blocking resistance, water resistance, solvent resistance, and abrasion resistance. It became possible to obtain. Furthermore, the print protection member had excellent transferability and adhesion to recorded images, and had good productivity.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a print protection member of the present invention. 1-111 base material 2-111 lower layer 3--m-upper layer 4-111 Transfer layer

Claims (4)

[Claims] (1) A print protection member having a base material and a transfer layer releasably provided on the base material, characterized in that the transfer layer contains at least a solvent-based thermoplastic resin and a water-based thermoplastic resin. Print protection material. (2) The print according to claim 1, wherein the transfer layer has a two-layer structure, the base layer containing a solvent-based thermoplastic resin, and the other layer containing a water-based thermoplastic resin. Protective member. (3) The print protection member according to claim 1, wherein the solvent-based thermoplastic resin is a butyral resin. (4) The print protection member according to claim 1, wherein the water-based thermoplastic resin is a water-based olefin resin.