JPS6225427B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a cured laminated film of an ultraviolet curable resin on plastic products, metals, paper, wood products, etc.

Conventionally, when laminating an ultraviolet cured film on the surface of various base materials such as plastics, the method used is to apply a fluid resin to the surface of the base material and cure it by directly irradiating it with ultraviolet rays, but the process is time consuming. Moreover, because the paint is exposed, dust and the like adhere to it, or it hardens while floating in the resin, reducing the light transmittance of the cured film. Furthermore, due to the coating method, the thickness of the film is non-uniform, and the non-uniformity is particularly significant when coating on a curved surface.

This invention solves the drawbacks of the conventional method as described above,
This process was completed with the aim of forming an ultraviolet-cured film with excellent light transmittance and uniform thickness.

UV-curable resin paints are usually of the radical polymerization type and the UV-curable epoxy type, and the radical polymerization type consists of a base resin, a reactive diluent, and a photosensitizer. The base resin used is an acrylic oligomer with an acrylic group at the end, such as polyester acrylate, urethane acrylate, epoxy acrylate, or spiroacetal acrylate.As the reactive diluent, ethyl diethylene glycol acrylate, methyl triethylene glycol acrylate, or phenolic resin is used. Ethyl acrylate and other materials with excellent dilution effects, low volatility without deteriorating the characteristics of the base resin, and no odor or toxicity are used.

The photosensitizer used is a compound that generates radicals to initiate a polymerization reaction when exposed to ultraviolet rays.

Incidentally, although many types of ultraviolet curable resin coatings are commercially available, the present invention is applicable to any of these and is not limited to the above.

In this invention, when laminating an ultraviolet curable resin (hereinafter referred to as a curable resin) onto a base material such as plastic, metal, paper, or wood board, a transparent film having release properties, such as a release process, is applied in advance. 2. Polyester film, fluororesin film, or other plastic film containing a release agent.
Curing resin 2 is laminated between sheets 3 and 3' (first
figure). At this time, the thickness of the curable resin can be made constant by, for example, calendering.

Next, one side 3' of the releasable film is peeled off and bonded to the surface of the base material 1. In this way, a laminate of the curable resin 2 and the other release film 3 is formed on the base material 1, and then the curable resin 2 is cured by irradiating ultraviolet rays from the film surface. This is a method of peeling off the release film 3 on the other side (FIG. 2).

In this case, it is preferable that the releasable film 3, 3' has a higher releasability than that of the releasable film 3', which is peeled off before bonding to the base material, than the releasable film 3, which is peeled off after curing.

When forming a cured film on a substrate having a curved surface, a thermoplastic sheet or plate such as ABS, styrene, MMA, polycanate, etc. is used as the substrate, and the curable resin is applied onto the substrate 1 using the method described above. 2 and a releasable transparent film 3 are layered, and a desired curved surface shape is formed by vacuum forming, pressure forming, etc., and then the curable resin 2 is cured by ultraviolet irradiation,
A method of peeling off a releasable film can be used.

The cured film products obtained by this method are free of foreign matter and have extremely high light transmittance, and can be used in many applications such as curved mirrors and other mirrors, furniture, building materials, and window panels.
Further, since UV-curable resins generally have excellent water resistance, weather resistance, and scratch resistance, they have many uses even when used outdoors.

The laminate of the curable resin and the release film can be produced using a roll coater, a knife coater, a gravure coater, or the like.

Examples of the present invention will be described below. Example 1 Radical polymerizable cured resin (20 μm) was placed between two transparent polyester release films (thickness 0.2 mm) with different release properties. After laminating and pasting the mold release film on the nickel-plated copper plate while peeling off the release film with the greater release property, a hardening film is formed by ultraviolet irradiation, and the other release film is peeled off. As a result, a metal plate laminated with a cured film having a uniform thickness and a light transmittance of 70% or more was obtained.

Example 2 Same as Example 1, two transparent polyester release films (thickness 0.2 mm) with different release properties were used.
The resin and release film are laminated onto printed high-quality paper using a laminate of epoxy polymerized resin (15μ), and the release film is peeled off after being cured by ultraviolet irradiation. A printed wood-free paper laminated with a cured film with a transmittance of 70% or more was obtained.

Example 3 An ABS plate (thickness 1
A radical polymerizable resin paint (15μ) and a transparent fluororesin-based release film are laminated and pasted onto the surface (mm), and the film is irradiated with ultraviolet rays and the release film is peeled off. An ABS board laminated with a cured film with excellent scratch resistance was obtained.

Example 4 In the same manner as in Example 3, a substrate MMA plate (thickness 0.5
Radical polymerizable resin (thickness: 20 μm) and transparent fluororesin-based release film were laminated and adhered to the substrate (20 μm thick), formed into a hemispherical shape using the substrate as the outer wall using vacuum forming method, and irradiated with ultraviolet rays. After forming the resin into a cured film, the releasable film was peeled off to obtain a molded product in which a cured film with a light transmittance of 70% or more and excellent weather resistance and scratch resistance was laminated on the inner wall of a hemispherical shape.

As described above, in the method of the present invention, when forming a cured film by ultraviolet curing on a substrate, an uncured resin is laminated between two transparent release films, and one release film is This is a method in which the film is peeled off and laminated on the base material surface, and then cured with ultraviolet rays with another release film attached, either as is or after being molded. It prevents curing while dust remains suspended, and can provide a cured film with extremely high light transmittance.

Further, since vacuum forming, pressure forming, etc. can be performed before curing, a cured film can be uniformly formed even on a curved surface or a surface with many irregularities.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a state in which a laminate is laminated and adhered to a base material. FIG. 2 is an enlarged sectional view of the state in which the releasable film is peeled off after curing. FIG. 3 is an enlarged cross-sectional view of a state in which a curved body is molded, cured by ultraviolet light, and the release film is peeled off. In the figure, 1... base material, 2... ultraviolet curable resin layer, 3, 3'... releasable film.

Claims (1)

[Scope of Claims] 1. Laminated between two releasable transparent films with an ultraviolet curable resin interposed between them, one of which is peeled off and adhered to the surface of a base material, and then exposed to ultraviolet rays to form a base material. A method for producing a cured film laminate, comprising forming a cured film on a material and peeling off the other transparent film having releasable properties. 2. Of the two transparent films having release properties, the release degree of the film corresponding to the side to be laminated to the surface of the base material is greater than the release degree of the film on the other side (outer surface). A method for producing a cured film laminate according to claim 1. 3. Claims 1 and 3, in which the laminate is formed by vacuum forming, pressure forming, etc. while being adhered to the surface of the base material, and then UV curing is performed, and then the release film on the outer surface is peeled off. 2. A method for producing a cured film laminate according to item 2.