JPH08318598A - Production of laminated type anti-fogging panel made of synthetic resin - Google Patents

Abstract

PURPOSE: To produce the title laminated type anti-fogging panel excellent in water resistance and having durability. CONSTITUTION: When a laminated type anti-fogging panel is obtained by bonding a synthetic resin base panel and an anti-fogging film or sheet made of a cellulosic synthetic resin, an adhesive prepared by adding 0.1-10 pts.wt. of a triisocyanate curing agent to an adhesive composed of an one-pack type humidity curable polyurethane resin is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to synthetic resins for use in ski goggles, sunglasses, glasses, helmet shields, windshields for motorcycles, underwater glasses, see-through plates for gas masks, daylighting plates for greenhouses, mirrors, etc. The present invention relates to a method for manufacturing a laminated anti-fogging plate.

[0002]

2. Description of the Related Art Conventionally, a synthetic resin anti-fogging plate is usually treated with an alkali treatment by using a cellulose-based synthetic resin sheet or film such as acetate plastic, cellulose acetate butyrate, or cellulose propionate as a base material. In general, those having an antifogging property on the surface are widely used (for example, Japanese Patent Laid-Open No. Sho 5).
6-76434, 57-36131).

In order to improve the physical properties of the synthetic resin anti-fog plate using the above-mentioned cellulose-based synthetic resin sheet or film as a base material, the synthetic resin anti-fog plate and the synthetic resin substrate are bonded and laminated, In addition, there is a proposal to use an adhesive composed of a one-component moisture-curable polyurethane-based resin in order to obtain strong adhesive integration during this adhesion (Japanese Patent Laid-Open No. 62-15230).

[0004]

However, even when the above-mentioned one-component moisture-curable polyurethane-based resin is used as an adhesive, the adhesive layer cross section under high temperature and high humidity or in a flooded state, or the synthetic resin substrate or There is a problem that water penetrates from the surface of the synthetic resin anti-fog plate, the adhesive force is reduced, and the synthetic resin substrate and the synthetic resin anti-fog plate are separated.

An object of the present invention is to solve the above problems and to provide a method for producing a synthetic resin laminated anti-fogging plate having excellent water resistance and durability.

[0006]

Means for Solving the Problems The present invention provides a laminated anti-fog plate obtained by bonding a double-sided anti-fog film or sheet made of cellulose-based synthetic resin, which has been subjected to anti-fog treatment to at least one surface of a synthetic resin substrate. The above-mentioned adhesion is performed using a mixture of 0.1 to 10 parts by weight of a triisocyanate-based curing agent with 100 parts by weight of an adhesive made of a one-component moisture-curable polyurethane-based resin. The gist is a method for manufacturing a synthetic resin laminated anti-fogging plate.

As the material of the above-mentioned anti-fogging film or sheet, one selected arbitrarily from the group of diacetyl cellulose, triacetyl cellulose, cellulose acetate butyrate and cellulose purpionate is preferably used as in the conventional products. The anti-fog treatment on both sides is
According to a conventional conventional method, for example, JP-A-56-7643
No. 4 and No. 57-36131 are preferably performed by immersion treatment in an alkaline aqueous solution.

On the other hand, the synthetic resin substrate to be laminated on one surface of the anti-fog film or sheet is a thermoplastic synthetic material which is transparent or colored and has good optical transparency in general applications requiring transparency. Although a resin sheet is used, a semitransparent plate may be used for applications such as a daylighting plate, and for applications such as a mirror, it is substantially opaque with a reflecting layer on one side. It is also possible that a board is used. As the material of this board,
For example, in addition to the same cellulose-based synthetic resin as the material of the anti-fog film, polyester-based resin, vinyl chloride-based resin, or acrylic resin, styrene-based resin, or copolymer resin thereof when heat resistance is required. Further, when impact resistance is required, a polycarbonate resin is used. That is, depending on the relationship of each application,
From the above resin group, a kind of resin is selected and used according to the required characteristics. In addition, when scratch resistance is required on the surface, there may be used a resin sheet on which a transparent surface-cured film of acrylic, silicon, or methylolated melamine is provided.

By the way, the one-component moisture-curable polyurethane resin used as an adhesive between the anti-fogging film or sheet and the synthetic resin substrate is mainly composed of --NCO groups and has a polyether or polyester hydrophilic property. A liquid urethane-based resin composition containing a linear or branched polyurethane polymer having a flexible long-chain structure as a main constituent, and particularly needs to be one-component.

Commercially available products of this one-component moisture-curable polyurethane resin adhesive are "Monotac" (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), "MC-1000" (manufactured by Sakai Chemical Industry Co., Ltd.), and "Sumijour". (Made by Sumitomo Bayer Urethane),
"Takenate" (manufactured by Takeda Pharmaceutical Co., Ltd.), "Polynate"
(Made by Toyo Polymer), “Coronate” (made by Nippon Polyurethane Industry Co., Ltd.) and the like.

Further, according to the present invention, by using a mixture of 0.1 to 10 parts by weight of a triisocyanate-based curing agent with 100 parts by weight of a one-component moisture-curable polyurethane resin, the water resistance of the above problems can be solved. It is intended to improve the sex. Addition of less than 0.1 part by weight has no water resistance effect, and addition of more than 10 parts by weight undesirably reduces the adhesiveness of the adhesive.

Commercially available products of the triisocyanate type curing agent which are preferably used in the present invention are "Desmodur R" (4,4,4-triisocyanate triphenylmethane manufactured by Bayer) and "Desmodur RF" ( Examples include Bayer's tris-4-phenylisocyanate thiophosphate) and "Desmodur RFE"(Bayer's tris-4-phenylisocyanate thiophosphate). It is considered that the addition of this curing agent improves the water resistance because the molecular structure of the adhesive becomes a stitch structure, making it difficult for water to pass through.

[0013]

EXAMPLE A 0.4 mm-thick polycarbonate film was used as a synthetic resin substrate, and a one-component moisture-curable polyurethane resin (made by Sakai Chemical Co., Ltd., trade name: Monotack) was used as an adhesive on one side of this film. ) Is a triisocyanate-based curing agent (manufactured by Bayer, trade name: Desmodur R) in Table 1
What was added in the amount shown in was applied. Thereafter, an antifogging film made of triacetyl cellulose having a thickness of 190 μ, which was subjected to antifogging treatment on both sides by a conventional method, was attached.

The synthetic resin laminated anti-fogging plate thus obtained was evaluated as follows. The results are shown in Table 1.

(1) Adhesive Strength According to JIS K 6854, a sample having a width of 25 mm was subjected to a T-type peel test at a tensile speed of 300 mm / min with a tensile tester to measure its tensile strength.

(2) Water resistance A sample having a size of 50 × 50 mm was immersed in warm water at 60 ° C. for 2 weeks, and then the naked eyes of the synthetic resin antifogging plate and the synthetic resin substrate were observed.

Further, as a comparative example, as shown in Table 1, a curing agent was added in an amount outside the proper range of the present invention, and a synthetic resin anti-fogging plate was produced in the same manner as in the above-mentioned example, and was obtained. The same evaluation was performed for the products. The obtained results are also shown in Table 1.

[Table 1]

Claims (4)

[Claims] 1. When a laminated anti-fog plate is obtained by adhering a double-sided anti-fog film or sheet made of a cellulose-based synthetic resin, which has been subjected to anti-fog treatment to at least one surface of a synthetic resin substrate, the above-mentioned adhesion is carried out by one liquid A synthetic resin laminated anti-fogging plate, characterized in that 0.1 to 10 parts by weight of a triisocyanate-based curing agent is mixed with 100 parts by weight of an adhesive composed of a hydrophilic moisture-curable polyurethane-based resin. Manufacturing method. 2. The synthetic resin laminated anti-fogging plate according to claim 1, wherein a transparent or colored translucent thermoplastic synthetic resin sheet is used as the substrate. 3. An anti-fogging film or sheet comprising one selected from the group consisting of diacetyl cellulose, triacetyl cellulose, cellulose acetate butyrate, and cellulose purpionate, which has been subjected to alkali treatment. Claims in which is used
Item 3. A method for producing a synthetic resin laminated anti-fogging plate according to Item 2 or Item 2. 4. A synthetic resin comprising one or a copolymer selected from the group consisting of a cellulose resin, a polyester resin, a vinyl chloride resin, an acrylic resin, a styrene resin, and a polycarbonate resin as a substrate. The method for producing a synthetic resin laminated anti-fogging plate according to claim 3, wherein a sheet is used.