JP2002317061A - Sheathing film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a sheathing film good in workability in sticking itself on a substrate irrespectively of ambient temperature such as atmospheric temperature. SOLUTION: This sheathing film is obtained by using as the raw material a compound of a polyvinyl chloride resin and a graft resin where polyvinyl chloride is grafted to an ethylenevinyl acetate copolymer. The sheathing film thus obtained is characterized by being 3-36 MPa in 3% modulus, 20% modulus and yield strength at an ambient temperature of 5-40 deg.C respectively, and >=100% in elongation at break at an ambient temperature of 5-40 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exterior film used for automobiles and signboards.

[0002]

2. Description of the Related Art Exterior films are used for automobile pillars and the like.
A film that can be pasted for the purpose of protecting the design and the surface, etc., instead of conventional painting, and is made of synthetic resin or the like. And metals such as iron and aluminum,
An adhesive is coated on one side of the base so that the base can be easily attached to a substrate made of a resin such as acrylic or polycarbonate. Conventionally, a film made of polyvinyl chloride resin is used as such an exterior film, but an exterior film made of polyvinyl chloride resin has a large temperature dependence of physical properties such as film hardness. For example, in winter when the temperature is low, the film becomes hard, and when the film is applied to a substrate, the film tends to wrinkle. There is a problem that it takes time to attach the material to the material and the workability is reduced.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an exterior film having good workability when affixing to a substrate, irrespective of environmental temperature such as air temperature.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have developed a blend of a polyvinyl chloride resin and a graft resin obtained by graft-polymerizing polyvinyl chloride on an ethylene-vinyl acetate copolymer. And a 3% modulus, a 20% modulus, and a yield point strength of 3M at an ambient temperature of 5 ° C to 40 ° C, respectively.
Not less than Pa and not more than 36 MPa, and an ambient temperature of 5 ° C.
To provide an exterior film having a breaking elongation at a temperature of from 40 ° C. to 100 ° C. each. The weight ratio of the polyvinyl chloride resin to the graft resin is 3: 7 to 7: 3, and the graft resin is an exterior film containing 30% or more and 60% or less of an ethylene vinyl acetate copolymer. provide. Further, the present invention provides an exterior film comprising a blend of a polyvinyl chloride resin and a graft resin, and 40 parts by weight or less of a plasticizer.

The exterior film according to the present invention is an exterior film made from a blend of a polyvinyl chloride resin and a graft resin obtained by graft-polymerizing polyvinyl chloride on an ethylene-vinyl acetate copolymer. 3% modulus and 20% at an ambient temperature of 5 ° C. to 40 ° C.
Modulus and yield point strength are each 3MPa or more and 36M
Pa or less, and the elongation at break at an ambient temperature of 5 ° C. to 40 ° C. is 100% or more. Therefore, regardless of the temperature of the environment such as the air temperature, the workability at the time of attaching to the substrate is good. is there. Further, in the film for packaging according to the present invention, the weight ratio of the polyvinyl chloride resin to the graft resin is 3: 7 to 7: 3, and the graft resin contains 30% by weight of the ethylene-vinyl acetate copolymer. Since the content is not less than 60% and the film is not extremely hard, the application work is easy. Furthermore, in the exterior film according to the present invention, the blend of the polyvinyl chloride resin and the graft resin contains four plasticizers.
Since it is blended in an amount of 0 part by weight or less, bleeding of the plasticizer is small, compatibility with the adhesive is good, and adhesive strength can be maintained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The exterior film according to the present invention is a film having a thickness of 0.05 mm or more and 0.20 mm or less, and one surface thereof is coated with an adhesive. The exterior film is made from a blend of a polyvinyl chloride resin and a graft resin obtained by graft-polymerizing polyvinyl chloride on an ethylene-vinyl acetate copolymer. When the weight ratio of the polyvinyl chloride resin to the graft resin exceeds 70%, for example, when the temperature during use is as low as 5 ° C., the modulus is reduced. Higher, the film is likely to break or wrinkle, and there is more plasticizer (40
If it is added (in excess of parts by weight), the modulus becomes 3 MPa or less in an atmosphere of 40 ° C., making it difficult to adhere and poor workability.
On the other hand, when the weight blending ratio of the graft resin exceeds 70%, for example, when the temperature during use is a high temperature of about 40 ° C., the modulus is reduced, the film is not strained, and it is difficult to attach the film. 3: 7 to 7: 3 are preferred.

The average degree of polymerization of the polyvinyl chloride resin used in the compounding is 700 from the viewpoint of calendering.
It is preferably from 1500 to 1500. Further, the weight content of the ethylene-vinyl acetate copolymer in the graft resin is preferably 30% or more and 60% or less from the viewpoint of calendering. The average degree of polymerization of the graft resin is preferably 800 or more and 1500 or less from the viewpoint of calendering.

[0008] Further, the blend of the polyvinyl chloride resin and the graft resin includes a polyester resin or dioctyl phthalate (DOP / dioctyl phthalate).
The phthalate-based plasticizer such as e) is contained in an amount of 40 parts by weight or less, preferably 30 parts by weight or less from the viewpoint of physical properties. Further, as such a plasticizer, it is preferable to use a polyester plasticizer from the viewpoint of environmental hormone problems and weather resistance.

Next, physical properties of the exterior film according to the present invention will be described. First, 3% of this exterior film
Regarding the modulus, the value measured at an ambient temperature of 40 ° C. is 3M so that the film does not lose its strain when the temperature at the time of use is high, for example, near 40 ° C.
Pa or more is preferable. The value measured at an ambient temperature of 5 ° C. is, for example, 36 MPa so that the film does not become hard when the air temperature during use is a low temperature near 5 ° C.
The following is preferred.

Further, in addition to the above-mentioned modulus at 3%, the 20% modulus and the yield point strength are also 5 ° C.
From 3 MPa and 36 to 36 ° C, respectively.
It is preferable that it is not more than MPa for the reason of suitability for the sticking operation.

Here, the method of measuring the modulus is as follows.
Tensile property test of JIS K 6732 (speed 20
0 mm).

Further, the ambient temperature of this exterior film is 5
The elongation at break measured at 100 ° C. is preferably 100% or more so that the film does not become hard when the temperature during use is low, for example, around 5 ° C. In addition to the elongation at break measured at the ambient temperature of 5 ° C., the elongation at break measured at the ambient temperature of 40 ° C. is preferably 100% or more from the viewpoint of suitability for the bonding operation.

As the method for producing the exterior film according to the present invention, conventional film forming methods such as a resin polymerization method, a compounding method, and a calendering method are used. Then, after being formed into a film, an adhesive such as an acrylic resin is applied to one surface thereof.

The method of using the exterior film according to the present invention is not particularly limited. For example, a general-purpose bonding jig or the like may be used on a substrate made of metal or resin such as a vehicle such as an automobile or a signboard. , Pasted by human hands.

The exterior film according to the present invention comprises:
The design can be appropriately changed without being limited to the above embodiment. For example, an ultraviolet absorber or the like may be blended to improve the weather resistance against outdoor use and the like.

[0016]

The test results of the examples and comparative examples will be described below.

(Examples 1 to 5, Comparative Examples 1 to 4) Preparation of Test Samples A polyvinyl chloride resin polymerized by an ordinary method, an ethylene vinyl acetate copolymer and polyvinyl chloride were graft-polymerized. Compounded with a graft resin consisting of
A polyester-based plasticizer or a phthalate-based plasticizer was added to prepare a resin composition before film formation. Then, a barium-zinc organic composite stabilizer (AC-258, Asahi Denka Kogyo Co., Ltd.) was added to this resin compound as a stabilizer.
3.5 parts by weight), 0.3 parts by weight of a barium-zinc organic composite stabilizer (SP-83, manufactured by Asahi Denka Kogyo KK), and an acrylic processing aid (P-530) as a processing aid.
A, manufactured by Mitsubishi Rayon Co., Ltd.) in an amount of 5.0 parts by weight, and an exterior film was prepared by calendering. Table 1 shows the detailed conditions of each resin and the like, the thickness of the exterior film after film formation, and the like. -Test method Tensile property test: Modulus, yield point strength and elongation at break were measured at a tensile speed of 200 mm / min and an ambient temperature of 5 ° C to 40 ° C in accordance with JIS K 6732. Pasting workability: After storing each sample at 5 ° C. to 40 ° C. for 1 hour, the workability at the time of pasting the sample to an aluminum plate was evaluated. Table 2 summarizes the results.

[0018]

[Table 1]

[Table 2] In Examples 1 to 5, the temperature stored for 1 hour was 5 ° C. and 40 ° C.
Also in the case of ° C, the sticking workability was good. on the other hand,
Comparative Example 1 in which the weight ratio of the polyvinyl chloride resin to the graft resin was 2: 8, which was out of the range of 3: 7 to 7: 3.
Then, when the stored temperature was 5 ° C., the sticking workability was reduced. In addition, 3 measured at an ambient temperature of 40 ° C.
In Comparative Examples 2 and 3 in which the% modulus was 2 MPa and less than 3 MPa, when the stored temperature was 40 ° C., the bonding workability was reduced. Further, the ambient temperature is 5 ° C.
Elongation at break measured at 70%
% In Comparative Example 4 where the storage temperature was 5 ° C., the sticking workability was reduced. In addition, this exterior film can be applied to a substrate having a curved surface such as a signboard, in addition to a vehicle.

[0019]

The exterior film according to the present invention is an exterior film made from a blend of a polyvinyl chloride resin and a graft resin obtained by graft-polymerizing polyvinyl chloride on an ethylene vinyl acetate copolymer. The 3% modulus and the 20% modulus and the yield point strength at an ambient temperature of 5 ° C. to 40 ° C. are 3 MPa to 36 MPa, respectively, and the breaking elongation at an ambient temperature of 5 ° C. to 40 ° C. is 100%. % Or more, the workability at the time of sticking to the base material is good regardless of the environmental temperature such as the air temperature.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F071 AA24 AA45 AA77 AE04 AF26 AF48 AH03 AH07 AH11 4J002 BD03W BN07X CF03Y CF04Y EH146 FD02Y FD026 GC00 GL00 GN00 4J004 AB01 CA03 CA05 CC02 FA04

Claims (3)

[Claims] 1. An exterior film made from a blend of a polyvinyl chloride resin and a graft resin obtained by graft-polymerizing an ethylene-vinyl acetate copolymer with polyvinyl chloride, wherein the ambient temperature is 5 ° C. to 40 ° C. 3% modulus and 20% modulus and yield point strength at
A film for exterior use, which has an elongation at break of at least 36 MPa and an ambient temperature of 5 ° C. to 40 ° C. of 100% or more, respectively. 2. The weight ratio of the polyvinyl chloride resin to the graft resin is from 3: 7 to 7: 3, and the graft resin has an ethylene vinyl acetate copolymer content of at least 30% and not less than 60%.
%. 3. The exterior film according to claim 1, wherein a plasticizer is blended in a blend of the polyvinyl chloride resin and the graft resin in an amount of 40 parts by weight or less.