JPH0664104A - Manufacture of self-adhesive thermoplastic resin foamed sheet - Google Patents

Abstract

PURPOSE:To realize a releasable layer in uniform thickness, and to obtain the title foamed sheet, properties of which are hardly changed, by providing a process, in which a thermoplastic film having the releasable layer consisting of an ultraviolet curing type silicone resin layer on an external surface on the top face of the thermoplastic resin foamed sheet, and a process in which an adhesive layer is formed onto other surfaces. CONSTITUTION:A thermoplastic resin film 12 is coated with an ultraviolet curing type silicone resin composition, and an ultraviolet curing type silicone resin is cured through ultraviolet-light irradiation, thus forming a silicone releasable layer 13. The thermoplastic film 12 with the releasable layer 13 is superposed, joined and laminated on the top face of a thermoplastic foamed sheet 11 while positioning the releasable layer 13 on the outside. The other surface of the thermoplastic resin foamed sheet 11 is coated with adhesives, thus forming an adhesive layer 15. The joining of a releasable film 14 and the coating of adhesives can be conducted simultaneously, and curing by the silicone resin composition of the releasable film 14 can be performed easily by the irradiation of the silicone resin composition with ultraviolet rays after joining through a thermal laminating method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a dew condensation prevention material in packaging materials, protective materials, cushioning materials, heat insulating materials, or fixed parts of outer wall panels of assembled houses, and ramen structure housing units. The present invention relates to a method for producing a thermoplastic resin foam sheet having a pressure sensitive adhesive layer.

[0002]

2. Description of the Related Art Adhesive thermoplastic resin foamed sheets can be easily attached to a target object by giving them adhesiveness while making the best use of the characteristics of a foamed body. It has been applied to a wide range of fields such as materials, but especially when a thermoplastic resin foamed sheet with an adhesive layer is stacked or rolled, peeling is prevented by preventing adhesion between the stacked sheets or between the rolled layers. In order to have the property, the release paper was interposed.

[0003]

In the above-mentioned conventional adhesive thermoplastic resin foamed sheet, when the rolled sheet is rolled or the sheets are stacked and brought to the site, the release paper interposed as described above is generated. In addition to being a waste material and wasting resources, it costs too much to bring it back,
It was very wasteful. As a countermeasure, an adhesive thermoplastic resin foam sheet in which a silicone release layer is provided on one surface of the thermoplastic resin foam sheet and an adhesive layer is provided on the opposite surface as proposed in Japanese Patent Application No. 3-136686 is proposed. ing. However, since there is no established technique for producing the adhesive thermoplastic resin foam sheet, the development of an advantageous method has been desired. The present invention aims to solve this problem.

[0004]

The outline of claim 1 is to obtain a release film by coating a thermoplastic resin film with an ultraviolet-curable silicone resin composition and then curing the ultraviolet-curable silicone resin by irradiation with ultraviolet rays. Adhesive thermoplastic resin foam sheet comprising a step and a step of bonding and laminating the release film on one surface of the thermoplastic resin foam sheet with the release layer outside and providing an adhesive layer on the other surface of the sheet. Is a manufacturing method. The outline of claim 2 is a step of applying a UV-curable silicone resin composition to a thermoplastic resin film, semi-curing the UV-curable silicone resin by UV irradiation to obtain a release film preliminary body, and thermoplastic resin foaming. A step of completely bonding the semi-cured UV-curable silicone resin composition layer to the one side of the sheet by heat-bonding the release film outside with the release layer as the outside and bonding and laminating And a step of forming an adhesive on the other surface of the sheet, the method for producing an adhesive thermoplastic resin foam sheet.

This will now be described with reference to the drawings.
FIG. 1 shows an adhesive thermoplastic resin foam sheet obtained by the present invention. On the upper surface of the thermoplastic resin foam sheet 11, a release layer 13 composed of an ultraviolet curable silicone resin layer on the outer surface of the thermoplastic resin film 12 is formed. The release film 14 provided with is laminated, and the thermoplastic resin foam sheet 1 is also provided.
An adhesive layer 15 is provided on the lower surface of 1. In the practice of the present invention, the joining of the release film and the coating of the pressure-sensitive adhesive can be carried out at the same time, and the silicone resin composition layer of the release film is cured by ultraviolet rays after the joining by the thermal lamination method. It is easily performed by irradiating the silicone resin composition layer with ultraviolet rays. Further, the silicone resin composition layer is semi-cured by irradiation with ultraviolet rays and completely cured by heat during lamination.

As the thermoplastic resin foamed sheet used in the present invention, a thermoplastic resin such as polyurethane resin, polyethylene resin (including crosslinking), polypropylene resin or the like is used, and the foaming rate and the thickness of the foamed sheet are For example, a foaming ratio of 3 to 50 times and a thickness of about 3 mm to 10 mm can be applied, although it depends on the material and the application. Various resins such as polyester resin, polyethylene resin (including crosslinking), polypropylene resin, vinyl resin, polystyrene resin and acrylic resin are used as the thermoplastic resin film provided with the release layer of the ultraviolet curable silicone resin composition. In this case, it is necessary to select a material for the thermoplastic resin foam sheet and a material for the thermoplastic resin film that are easy to form a laminated structure by welding. The thinner the thermoplastic resin film is, the better.
Those having a thickness of about m to 1 mm are used. It can be formed by laminating a film made of the same material as or similar to that of the foam layer or by coextrusion with the foam layer.

There are various types of UV-curable silicone resin compositions. Among them, the one in which an epoxy-functional silicone is cured by UV in the presence of a cation-generating catalyst does not inhibit curing by oxygen. ,
Epoxy-functional silicones, which are said to have no unpleasant odor, but further contain an antistatic agent composed of a compound containing no nitrogen, phosphorus and sulfur and a photoinitiator, are preferred. (See Japanese Patent Application Laid-Open No. 4-59207), here, epoxy-functional silicones include polymethyl hydrogen siloxane, olefinic epoxy monomers such as 4-vinylcyclohexene oxid, allyl glycidyl ether, and 7-epoxy-1-octene. It can be obtained by addition reaction of a monomer. Further, the lamination can be easily achieved by using a heating roll, but in some cases, an adhesive may be applied and adhered.

The pressure-sensitive adhesive must be selected according to the resin constituting the foamed layer. For example, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, polyisobutylene,
A thermoplastic resin such as polybutadiene, butadiene-styrene copolymer, butyl rubber, etc., which is made tacky by adding rosin, a thermosetting resin, a solvent, etc., can be applied. The adhesive physical properties of the adhesive thermoplastic resin foam sheet according to the present invention include adhesive strength to SUS of 1800 g / 25 mm or more (JIS
Z 0237), a constant load for 1 hour or more (not according to JIS Z 0231), and a deploying force at 200 mm / min of 100 to 500 g / 5 cm (JIS Z 02).
37) is suitable.

[0009]

【Example】

Example 1 An ultraviolet-curable silicone resin composition (trade name: X-, manufactured by Shin-Etsu Chemical Co., Ltd.) was formed on one side of a polyethylene film having a thickness of 50 μm.
No. 62-5040), 100 parts by weight, 2 parts by weight of an adhesion improver (trade name: X-92-185, manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.5 parts by weight of a curing catalyst are added to make a uniform ultraviolet curable silicone resin composition. Is applied to a thickness of 10 to 15 μm, and the resin is cured by irradiation with ultraviolet rays to form a polyethylene film having a release layer as a resin layer having releasability, and then polyethylene having this release layer. The film is placed with one side of the cross-linked polyethylene foam sheet having a thickness of 3 mm (foaming ratio: 30 times) with the surface of the release layer facing outside, and laminated with a heating roll, and ethylene is attached on the other side of the cross-linked polyethylene foam sheet. Acrylic acid copolymer 100
An adhesive layer consisting of 25 parts by weight of rosin and 50 parts by weight of solvent was applied to parts by weight to form an adhesive layer, and an adhesive thermoplastic resin foam sheet was obtained. This adhesive thermoplastic resin foam sheet was satisfactory in adhesive physical properties, that is, adhesive strength, constant load, and spreading power, and was suitable for joints and heat insulation.

Example 2 An ultraviolet curable silicone resin composition (trade name: X-, manufactured by Shin-Etsu Chemical Co., Ltd.) was formed on one side of a polyethylene film having a thickness of 50 μm.
No. 62-5040), 100 parts by weight, 2 parts by weight of an adhesion improver (trade name: X-92-185, manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.5 parts by weight of a curing catalyst are added to make a uniform ultraviolet curable silicone resin composition. Is applied to a thickness of 10 to 15 μm to form a polyethylene film having a releasable resin layer preliminary layer without curing the resin by ultraviolet irradiation, and then this releasable resin layer preliminary The cross-linked polyethylene film having a body layer with the surface of the release layer facing outside,
A 5 mm thick cross-linked polyethylene foam sheet (expansion ratio 30 times) is irradiated with ultraviolet rays while being bonded by heat lamination on one side to form a cross-linked thermoplastic resin foam sheet provided with a release layer, and then on the other side. An adhesive layer comprising 25 parts by weight of rosin and 50 parts by weight of solvent was applied to 100 parts by weight of the ethylene-acrylic acid copolymer to form an adhesive layer to obtain an adhesive thermoplastic resin foam sheet. This adhesive thermoplastic resin foam sheet has an adhesive physical property, that is, adhesive strength,
Both constant load and deployment force were satisfied, and it was suitable for joints and heat insulation.

Example 3 An ultraviolet curable silicone resin composition (trade name: X-, Shin-Etsu Chemical Co., Ltd.) was formed on one surface of a polyethylene film having a thickness of 40 μm.
No. 62-5040), 100 parts by weight, 2 parts by weight of an adhesion improver (trade name: X-92-185, manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.5 parts by weight of a curing catalyst are added to make a uniform ultraviolet curable silicone resin composition. To a thickness of 10 to 20 μm, the resin is cured by irradiation with ultraviolet rays to form a polyethylene film having a release layer as a resin layer having releasability, and then a vinyl chloride foam having a thickness of 10 mm. The one-sided surface was bonded using a urethane two-pack type adhesive. On the other hand, 25 parts by weight of rosin and 50 parts by weight of solvent were used for 100 parts by weight of ethylene-vinyl acetate copolymer to obtain a uniform pressure-sensitive adhesive paint,
An adhesive layer was formed by coating on the opposite surface. This adhesive thermoplastic resin foam sheet has an adhesive physical property, that is, adhesive strength,
Both constant load and deployment force were satisfied, and it was suitable for joints and heat insulation.

Comparative Example 1 A pressure-sensitive adhesive thermoplastic resin foam sheet of Comparative Example was obtained in the same manner as in Example 1 except that the ultraviolet curable silicone resin composition was directly applied without using a polyethylene film. The ultraviolet curable silicone resin composition could not be applied to a uniform thickness, the spreading force was large, and only a sheet having a low adhesive strength was obtained. Comparative Example 2 As a result of replacing the application of the ultraviolet curable silicone resin composition of Example 1 with an embossed polyethylene film bonded to the foam layer, the expansion force was increased, and only a sheet with low adhesive strength was obtained. I couldn't do it. Comparative Example 3 Silicone-coated paper was used as a separator without using the thermoplastic resin film layer coated with the ultraviolet curable silicone resin composition. I was satisfied with the adhesive properties,
However, a large amount of separator became waste.

As can be seen from the above embodiments, the present invention has no separator to be discarded, and since the peelable resin layer is provided, even if the amount of expensive ultraviolet-curable silicone resin used is small. A high adhesive strength is obtained. When the foam is polyethylene, polyethylene is the most preferable as the peelable resin layer, polypropylene is likely to cause vertical tearing, and polyethylene terephthalate can be obtained only with a small elongation, so it is necessary to consider its use. Further, as the thermoplastic resin foam sheet, in the case of continuous cells such as polyurethane,
When polyester is used, a pressure-sensitive adhesive can also be applied by coating on one side of a polyethylene sheet, and this can be provided by heat lamination to effectively use the adhesive strength.

[0014]

According to the present invention, since the silicone resin having releasability is not directly applied to the expandable resin layer, it is not applied to the unevenness of the expandable resin layer, and therefore, the release of a uniform thickness is achieved. Layers can be realized. Further, since the peelable silicone resin is cured by ultraviolet rays, unnecessary heat is not applied to each layer and there is little risk of deterioration. Further, the silicone resin that forms the peeling property and the foamed thermoplastic resin can be easily integrated by thermal lamination. Furthermore, as described in claim 2, it is also possible to carry out preliminary curing with ultraviolet rays and complete curing by heating during thermal lamination.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an example of an adhesive foam plastic sheet of the present invention.

[Explanation of symbols]

 11 Thermoplastic Resin Foamed Sheet 12 Thermoplastic Resin Film 13 Release Layer 14 Release Film 15 Adhesive Layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B32B 27/16 6122-4F 31/12 7141-4F C09J 7/02 JJA 6770-4J JJG 6770-4J JKZ 6770-4J E04B 1/66 A (72) Inventor Mutsuo Fukuda 3-8-3 Miyazono Nagareyama City, Chiba Prefecture (72) Inventor Yukio Ento 124-10 Bessho, Omiya City, Saitama Prefecture

Claims (2)

[Claims] 1. A step of applying a UV-curable silicone resin composition to a thermoplastic resin film, irradiating it with ultraviolet rays to form a silicone release layer, and forming a thermoplastic resin film having a release layer; A step of laminating a thermoplastic resin film having the release layer on one surface of the resin foam sheet, with the release layer on the outside, and bonding and laminating, and applying an adhesive to the other surface of the thermoplastic resin foam sheet. And a step of forming a pressure-sensitive adhesive layer, the method for producing a pressure-sensitive adhesive thermoplastic resin foam sheet. 2. A step of applying an ultraviolet-curable silicone resin composition to a thermoplastic resin film, irradiating it with ultraviolet rays to form a silicone semi-cured release layer, and forming a thermoplastic resin film having a semi-cured release layer. And a silicone semi-cured release layer while superposing the thermoplastic resin film having the silicone semi-cured release layer formed on one surface of the thermoplastic resin foam sheet with the release layer on the outer side and bonding and laminating by heat fusion. And a step of forming an adhesive layer on the other side of the thermoplastic resin foam sheet, and a method for producing an adhesive thermoplastic resin foam sheet.