JPH08157676A - Vinyl chloride resin film for curved face finishing - Google Patents

Abstract

PURPOSE: To provide a vinyl chloride resin film which constitutes the surface layer of a door for a system kitchen, a furniture, a closet and a face washing basin by formulating specific amounts of 2 kinds of acrylic resins different in their molecular structures and a plasticizer. CONSTITUTION: This film comprilses (A) 100 pts.wt. of PVC, (B) less than 30 pts.wt. of a methyl methacrylate/acrylic acid copolymer of formual I (R is an alkyl), an α-methyl-styrene/acrylonitrile copolymer or a methyl methacrylate/ maleimide copolymer, (C) less than 20 pts.wt. of a methyl methacrylate/alkyl acrylate copolymer of formula II, and (D) less than 20 pts.wt., particularly 5-12 pts.wt. of a plasticizer. The film has higher Vicat-softening temperature, heat distortion temperature and flex temperature than those of PVC and the shrinkage of the film can be suppressed when it is laminated on a curved-face substrate, by stretching it with a curved face laminating machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of vinyl chloride resin film forming a surface layer of doors for system kitchens, furniture, closets, wash basins, etc., and particularly to a curved surface suitable for a base material having a curved surface. The present invention relates to a vinyl chloride resin film for processing.

[0002]

2. Description of the Related Art Conventionally, for decorative boards such as furniture and building materials,
Polyvinyl chloride film is commonly used for painting and protecting the surface. The laminating process for laminating this polyvinyl chloride (PVC) film on a base material such as MDF or particle board is more difficult as the surface shape of the base material has a complicated shape such as a three-dimensional curved surface. It is difficult to properly attach the film along the surface shape of the substrate.

Therefore, a curved surface laminating machine as disclosed, for example, in Japanese Utility Model Laid-Open No. 5-65525 has been developed. The bonding principle of the curved surface laminating machine will be described with reference to FIG. 7. The polyvinyl chloride film a coated with the adhesive is the adhesive layer b and the surface of the base material c is the bonding surface of the three-dimensional curved shape. With a base material c and a curved surface laminating machine such as EP rubber (ethylene-propylene rubber) and the like, inserted between a rubber roll d and a metal roll e having good flexibility and heat resistance,
The rubber roll d is elastically deformed, and the polyvinyl chloride film a is attached along the curved surface shape of the base material c by heat and pressure.

[0004]

However, since the polyvinyl chloride film is stretched when it is attached to the base material, the stretched portion shrinks after the attachment and the portion floats up from the base material. There is a problem that the quality of the final product is impaired. Since the elongation at the time of bonding and the contraction after the bonding generally tend to be proportional, a polyvinyl chloride film having relatively little elongation at the time of bonding is adopted to prevent the above-mentioned lifting phenomenon after bonding. It is possible. However, in this case, the polyvinyl chloride film does not properly follow the surface of the base material, and the phenomenon of floating at the bottom corner of the recess occurs.

The present invention has been made in view of the above points, and an object thereof is to improve the compounding composition of a film so that the surface of a base material can be properly aligned at the time of bonding and shrinkage can be caused after bonding. The goal is to obtain a polyvinyl chloride film with a low content.

[0006]

In order to achieve the above object, the present invention is directed to a vinyl chloride resin film for curved surface processing, which is laminated along the curved surface shape of a base material. Was taken.

That is, the means for solving the present invention is to provide a methyl methacrylate-alkyl acrylate copolymer represented by the following general formula with respect to 100 parts by weight of polyvinyl chloride:

Embedded image 30 parts by weight or less of α-methylstyrene-acrylonitrile copolymer or methyl methacrylate-maleimide copolymer, 20 parts by weight or less of methyl methacrylate-alkyl acrylate copolymer represented by the following general formula:

[Chemical 4] It is characterized by containing 20 parts by weight or less of a plasticizer.

[0008] Of the compounding compositions constituting the film, a methyl methacrylate-alkyl acrylate copolymer represented by the following general formula,

Embedded image The α-methylstyrene-acrylonitrile copolymer or methylmethacrylate-maleimide copolymer is contained in an amount of 30 parts by weight or less because they have a higher Vigat softening temperature, a higher heat distortion temperature and a softer temperature than polyvinyl chloride, and Polyvinyl chloride is compatible, and the temperature of the film immediately after processing is 60 to 70 ℃, and the sensitivity of the film to the temperature of the film in the temperature range when the temperature of storage and use of the laminated product is assumed to be max 60 ℃. This is because it is possible to suppress the shrinkage of the film in the portion which is stretched and bonded to the base material by the curved surface laminating machine. Further, it is because the elongation at the time of processing is not reduced as compared with the case where no addition is made, and it is almost the same.

Further, a methyl methacrylate-alkyl acrylate copolymer represented by the following general formula having a structure different from that of the methyl methacrylate-alkyl acrylate copolymer represented by the above general formula

[Chemical 6] 20 parts by weight or less is to be added to polyvinyl chloride because it is a resin with a high degree of polymerization that is several tens of times longer than polyvinyl chloride in addition to compatibility with polyvinyl chloride. Thereby, the chain entanglement with polyvinyl chloride becomes dense, and it has the functions of improving the elongation rate of the film at the time of processing at a temperature of 60 to 120 ° C. and improving the suitability along the line.

The content of the plasticizer is set to 20 parts by weight or less because when it exceeds 20 parts by weight, when the film is sandwiched between the rubber roll and the metal roll of the curved laminating machine, the film is excessively stretched and then largely contracted. This is because it peels off from the base material and floats up, deteriorating the product value. Particularly, the range of 5 to 12 parts by weight is preferable.

[0011]

With the above-mentioned constitution, in the solution means of the present invention, the acrylic resin contained in the film can appropriately provide the elongation during the bonding and the contraction after the bonding, so that the film has no gap in the surface shape of the substrate. Along.

[0012]

Embodiments of the present invention will now be described with reference to the drawings along with comparative examples. The present invention is not limited to the examples given here.

Polyvinyl chloride 100 having an average degree of polymerization of 850
A plasticizer and various acrylic copolymers were blended in a blending ratio shown in Table 1 with respect to parts by weight, and a film having a thickness of 0.2 mm was wound by calendering. In addition, Table 1
Although not described in the above, an appropriate amount of an impact resistance agent (MBS Kaneace B-11A Kanegafuchi Chemical Industry Co., Ltd.) and a Cd-Ba type stabilizer are blended. Further, in Table 1, the acrylic copolymers Methbrene H-602, H-605, and H-630 are both manufactured by Mitsubishi Rayon Co., Ltd.
-602 is a methyl methacrylate-alkyl acrylate copolymer represented by the following general formula,

[Chemical 7] Metablen H-605 is an α-methylstyrene-acrylonitrile copolymer, and methablene H-630 is a methylmethacrylate-maleimide copolymer. In addition, the acrylic copolymer methabrene P-530, P-5
51 is also manufactured by Mitsubishi Rayon Co., Ltd., both of which are represented by the general formula below.
Is an alkyl acrylate copolymer,

Embedded image Metabrene P-530 has an average molecular weight of 3,000,000, and Metabrene P-551 has an average molecular weight of 1.5 million.

As shown in FIG. 1, a back surface of the film 1 obtained as described above is coated with an adhesive to form an adhesive layer 2, and a base material (MDF) A having a cubic curved surface having a concave portion a1.
The film 1 is inserted together with the base material A between the rubber roll made of EP rubber and the metal roll of the curved laminating machine (not shown) in a state where the adhesive layer 2 is directed to the surface which is the bonding surface of ( The insertion state is shown in FIG. 7), and the film 1 is heated by heat and pressure while elastically deforming the rubber roll.
Was adhered along the curved surface shape of the base material A under the following processing conditions.

<Processing conditions> Material temperature at the time of inserting rubber roll / metal roll made of EP rubber; 90 to 100 ° C. pressure; about 10 kg / cm ² line speed; 5 m / min adhesive; main agent NO5490 (solvent urethane): curing Agent U-70 (isocyanate compound) = 100: 5 manufactured by No-Tape Industries Co., Ltd. Film thickness of adhesive (dry); 100 μm

The film 1 laminated on the substrate A was evaluated under the following conditions, and the evaluation results are shown in Table 1.

<Adhesion to Depression> Immediately after molding; a molded product obtained by laminating the film 1 and the base material A is cut by a curved surface laminating machine to form a recess a of the base material A.
The degree of adhesion of film 1 in 1 was visually evaluated on a scale of 5 to 5.

After 60.degree. C..times.48 hours; using a curved surface laminating machine, a molded product obtained by bonding the film 1 and the base material A together was used.
The film was left in a gear oven set at 0 ° C. for 2 days (48 H) and then cut, and the degree of adhesion of the film 1 in the recess a1 was visually evaluated on a 5-point scale.

Evaluation rank: In Table 1, indicates that the film 1 is in close contact with the concave portion a1 of the base material A without any gap as shown in FIG. Indicates that the film 1 is slightly lifted from the corner of the bottom surface of the recess a1 of the base material A as shown in FIG. 4 indicates that the film 1 is largely lifted from the bottom surface of the concave portion a1 of the base material A as shown in FIG. As shown in FIG. 5, the film 1 has entered the concave portion a1 of the base material A, but is completely separated from the bottom surface of the concave portion a1. 6 shows that the film 1 does not follow the curved surface shape of the base material A as shown in FIG. 6, but passes through the recess a1 and becomes flat.

<Creep property> A sample having a width of 25 mm and a marked line of 100 mm was set in a tensile tester at 60 ° C., left for 1 minute, then pulled to 200 mm at a speed of 50 mm / min, and the lower chuck was removed to remove the sample. Release and leave for 5 minutes. Then, the sample was taken out and the amount of shrinkage was measured (evaluated only in the longitudinal direction). This creep property is a substitute test for the shrinkage of the film 1 after being attached to the base material A by a curved surface laminating machine.

<Tensile Elongation Rate> A test piece was prepared using a No. 1 dumbbell based on JIS-K-6734, and the test piece was heated at 60 ° C. and 80%.
Elongation in the longitudinal direction was measured at 100 ° C and 100 ° C using a tensile tester.

<Comprehensive Evaluation> Evaluation was made by the XX system. ◎ indicates that there was no problem, ○ indicates a little lower evaluation than ◎, but there is not much problem in use, × indicates that the evaluation is extremely low and can not be used. Represent each.

[0023]

[Table 1]

As a result, in Examples 1 to 8, satisfactory evaluations could be obtained for all evaluation items. However, in Comparative Examples 1 to 3, it was not possible to obtain particularly satisfactory evaluations of the degree of adhesion to the concave portion a1 and the creep property.

[0025]

As described above, according to the present invention,
Since two kinds of acrylic resins with different molecular structures were used as the resin that composes the film, the characteristics of this resin allow it to follow a three-dimensional cubic curved surface shape well, and the stretched portion does not shrink during bonding, which is excellent. Curved formability can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a film is attached to a base material.

FIG. 2 is a cross-sectional view showing a completely adhered state in the five-stage evaluation of the degree of adhesion of the film to the concave portion of the base material.

FIG. 3 is a cross-sectional view showing a state in which the film is slightly lifted from the corner of the bottom surface of the recess in the five-level evaluation of the degree of adhesion of the film to the recess of the base material.

FIG. 4 is a cross-sectional view showing a state in which the film greatly floats from the bottom surface of the recess and is only slightly in contact with the film, out of the five-level evaluation of the degree of adhesion of the film to the recess of the base material.

FIG. 5 is a cross-sectional view showing a state in which the film is completely separated from the bottom surface of the recess in the five-level evaluation of the degree of adhesion of the film to the recess of the base material.

FIG. 6 is a cross-sectional view showing a state in which the film is flat without following the curved surface shape of the base material in the five-stage evaluation of the degree of adhesion of the film to the base material concave portion.

FIG. 7 is a cross-sectional view showing a bonded state of a film by a curved surface laminating machine.

[Explanation of symbols]

 1 Film A Base material a1 Recess

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Claims (1)

[Claims] 1. A vinyl chloride resin film for curved surface processing, which is laminated along a curved surface of a base material, wherein methyl methacrylate-acrylic represented by the following general formula with respect to 100 parts by weight of polyvinyl chloride. Alkyl acid copolymer, 30 parts by weight or less of α-methylstyrene-acrylonitrile copolymer or methyl methacrylate-maleimide copolymer, 20 parts by weight or less of a methyl methacrylate-alkyl acrylate copolymer represented by the following general formula: A vinyl chloride resin film for curved surface processing, comprising 20 parts by weight or less of a plasticizer.