JP3380753B2 - Synthetic resin film or sheet and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has a flexural modulus of 50.
The present invention relates to a flexible synthetic resin film or sheet (hereinafter, referred to as “film / sheet”) of 00 kg / cm ² or less, and a method for producing the same.

[0002]

2. Description of the Related Art Films made of synthetic resin have been used for stationery, various cases, packaging, agriculture, etc.
Sheets are used.

[0003]

By the way, among the above-mentioned synthetic resin film sheets, a flexible synthetic resin film sheet, specifically, a bending elastic modulus of 5000 kg.
A film / sheet made of a synthetic resin of less than 1 cm ² / cm ² is said to be excellent in workability such as cutting such that the surface of the film / sheet sticks to the surface when the work such as stickiness or cutting is performed. It was something I couldn't say. Further, such a synthetic resin film / sheet, particularly a film / sheet made of an olefin resin, has a drawback that the surface is easily scratched (poor in scratch resistance).

A synthetic resin film / sheet is one of the methods for improving the stickiness of the surface of the synthetic resin film / sheet.
There is a known method of spraying and adhering fine powder such as starch powder on the surface of the sheet (that is, a method of dusting), but when dusting is performed on the surface of the synthetic resin film / sheet in this way. Although the stickiness of the surface of the film / sheet is improved, the fine powder adhering to the surface,
The scratch resistance is further deteriorated, for example, it becomes a factor of scratching the film / sheet surface.

On the other hand, as a method for improving the scratch resistance of the surface of the synthetic resin film, a method of applying silicone oil to the surface of the synthetic resin film or sheet can be considered. When silicone oil is applied to the film, although the scratch resistance of the film / sheet surface is improved, blocking between film / sheets is likely to occur, and there is a concern that workability such as cutting may be further deteriorated.

The present invention has been made to solve the above problems, and improves the tackiness of the surface of a flexible film or sheet, and at the same time, the film or sheet has scratch resistance or blocking resistance. The present invention also provides a synthetic resin film sheet and a method for producing the same, which are also improved.

[0007]

The synthetic resin film sheet of the present invention made to solve the above problems is a flexible film sheet made of synthetic resin and having a bending elastic modulus of 5000 kg / cm ² or less. Then, before winding in the manufacturing process of the film / sheet, at least one surface is coated with silicone oil, and at least one surface is dusted.

The method for producing a synthetic resin film / sheet according to the present invention, which has been made to solve the above problems, has a bending elastic modulus of 5000 kg / cm formed by an appropriate method.
It is characterized in that at least one surface of a synthetic resin film or sheet of ² or less is coated with silicon oil, and at least one surface is dusted and then wound.

The synthetic resin constituting the synthetic resin film / sheet of the present invention includes polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene-α-olefin copolymer. Olefin resins such as coalesce, polybutene, butene-α-olefin copolymer, crosslinked or non-crosslinked olefinic thermoplastic elastomer; polyvinyl chloride, vinyl chloride and ethylene, propylene, vinyl acetate, (meth) acrylic acid ester, Synthetic resin selected from vinyl chloride resins such as copolymers with acrylonitrile; acrylic resins such as (meth) acrylic acid ester (co) polymers and polyacrylonitrile; urethane resins; styrene resins; Examples include a mixture of these synthetic resins.

If necessary, the above synthetic resins include antistatic agents, antioxidants, plasticizers, stabilizers, light stabilizers such as hindered amine compounds, lubricants, ultraviolet absorbers, inorganic or organic fillers. Various additives such as various processing aids, colorants such as pigments, and the like may be added. Further, a rubber component such as olefin rubber, hydrogenated rubber such as hydrogenated styrene-butadiene rubber or hydrogenated styrene-isoprene rubber may be mixed.

A synthetic resin composition comprising the above-mentioned synthetic resin and various additives added thereto is a single layer or multi-layer by means of calendering method, extrusion method, coextrusion method, inflation method, coextrusion inflation method and the like. Film of
Formed into sheets. When a multilayer film / sheet is obtained, a multilayer film / sheet can be obtained by laminating a plurality of layers simultaneously with molding by means such as a coextrusion method and a coextrusion inflation method. The single-layer film / sheet obtained in the above step may be laminated in a subsequent step to form a multi-layer film / sheet.

The synthetic resin film / sheet of the present invention is
The flexural modulus obtained as described above is 5000 kg /
Obtained by applying at least one side of silicone oil and winding at least one side before winding in the process of manufacturing a synthetic resin film or sheet of cm ² or less, and then winding up. It is what is done. Alternatively, one side of the synthetic resin film or sheet may be coated with silicon oil and dusted, or one side may be coated with silicon oil and the other side dusted. May be performed. Of course, silicone oil coating or /
Alternatively, dusting may be performed on both sides of the synthetic resin film sheet.

The fine powder to be sprayed (powdered) on the surface of the synthetic resin film / sheet includes starch (including modified starch such as crosslinked starch), thermoplastic or thermosetting synthetic resin fine powder, talc, etc. Any of the fine powders conventionally used for spraying on the surface of this type of film / sheet, such as the above-mentioned inorganic fine powder, can be used. As the above-mentioned fine powder, spherical fine powder having an average particle size of about 3 to 30 μm is preferable, and
The amount of spray is preferably about 10 to ²⁰⁰ mg / m ² .

The synthetic resin film / sheet of the present invention is
Apply silicone oil on at least one side, and
Since it is obtained by winding at least one side and then winding it, the problem of stickiness on the surface is improved, and the scratch resistance and blocking resistance of the film / sheet surface are also improved. Is. That is, by using the silicone oil coating and dusting together, even though the silicone oil is coated, the blocking of the film sheet is unlikely to occur, and,
Despite the dusting, the scratch resistance is improved.

The thickness of the synthetic resin film / sheet of the present invention obtained as described above is set according to the application and the like and is not particularly limited, but for stationery as described above, When used for various cases, packaging, agriculture, etc., generally 0.03 to 2.
It is about 0 mm.

The synthetic resin film / sheet of the present invention is
If necessary, an embossed diaphragm such as satin or silk can be formed on one side or both sides, or a printed pattern by ordinary printing can be formed.

[0017]

EXAMPLES Specific examples of the present invention will be given below, but the present invention is not limited to the examples given below.

(Examples 1 to 5, Comparative Examples 1 to 3) Ethylene
-Methyl methacrylate copolymer resin (Acryft WH3
02: made by Sumitomo Chemical Co., Ltd.) with a thickness of 0.2 mm
Film (bending elastic modulus 600 kg / cm ²) On the surface
Silicone oil (“TS
F451-100 "; trade name, manufactured by Toshiba Silicon Co., Ltd.)
And fine starch powder with a particle size of 10 to 20 μm
("Nikkarico AS-100S"; trade name, Nikkasha
Made) (spraying amount is 50mg / cm²) (Or
Do not do it) and wind it up to obtain a synthetic resin film.
It was In addition, in Table 1 related to silicone oil coating and dusting
In the description, "○" means silicone oil coating or
"-" Indicates that the powder was shaken.
Indicates that no conoil coating or dusting was performed
is doing. Also, the scratch resistance of the obtained synthetic resin film
And blocking resistance were evaluated by the following methods.
It was The results are also shown in Table 1.

(Evaluation method) (1) Scratch resistance A vibration type friction tester using cotton cloth and a load of 500 g for 5
The state of the film rubbing surface after rubbing 00 times was visually observed and evaluated using the following criteria as a guide. In addition, this evaluation was performed on the front surface side and the back surface side of the film, respectively. <Evaluation Criteria> ◎: Almost no scratches ○: Some scratches are seen △: Scratches are noticeable ×: Significant scratches are generated (2) Blocking resistance The obtained film is cut into 10 cm × 10 cm The two test pieces thus obtained were sandwiched between glass plates of the same size so that the front side and the front side and the back side or the back side were in contact with each other, and a load of 1000 g was applied to the test piece under a temperature condition of 80 ° C After standing for 8 hours, the blocking state of the two test pieces was confirmed, and evaluated using the following criteria as a guide. <Evaluation Criteria> ◎: No blocking at all ○: Slight adhesion, but easy peeling △: Strong adhesion, but can be peeled ×: Strong blocking, cannot be peeled off

[0020]

[Table 1]

As described above, the synthetic resin films of Examples 1 to 5 coated with silicon oil and dusted were
Although excellent in terms of scratch resistance and blocking resistance, the synthetic resin films of Comparative Examples 1 to 3 that did not do these or did only one of them are inferior in terms of scratch resistance and / or blocking resistance. (Or, conversely, it is getting worse).

Some of the examples have inferior scratch resistance on one surface (back surface side) or inferior blocking resistance on the front surface side (back surface side). If one side has excellent scratch resistance, there are many sufficient applications,
Further, since the synthetic resin film is generally laminated so that the front surface side and the back surface side are in contact with each other, it is often not required that the front surface side and the back surface side have the same blocking resistance. Therefore, although it may be limited in use,
In many cases, even if one of the surfaces (back surface side) has poor scratch resistance as described above or the front surface side members (back surface side members) have poor blocking resistance, it can be used sufficiently. .

[0023]

As described above in detail, the synthetic resin film / sheet of the present invention has a flexural modulus of 5000 kg / cm.
^Although it is a flexible film or sheet having a surface roughness of ² or less, it has no stickiness on the surface and has excellent scratch resistance and blocking resistance on the surface of the film or sheet.

Claims (2)

(57) [Claims] 1. A flexural modulus made of synthetic resin is 5000.
a film or sheet having a weight of not more than kg / cm ² , which is before winding in the manufacturing process of the film or sheet,
A synthetic resin film or sheet having at least one surface coated with silicone oil and having at least one surface dusted. 2. A synthetic resin film or sheet molded by an appropriate method, at least one surface of which is coated with silicone oil, and at least one surface of which has been dusted and then wound. A method for producing a film or sheet having a flexural modulus of 5000 kg / cm ² or less.