JPH0446938A - Film having pearl luster - Google Patents

Abstract

PURPOSE:To prepare the title film translucent and excellent in strengths, etc., at a low cost without using an expensive pearling agent by forming a specific thermoplastic resin compsn. into a film under specific conditions. CONSTITUTION:A thermoplastic resin compsn. comprising 99-99.99wt.% polyester resin (e.g. a polyethylene terephthalate) and 0.01-1wt.% polymethylpentene is formed into a film, which is biaxially oriented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pearlescent film, and more specifically, it is used for packaging films for cosmetics and foods, catalogs, and poster decoration products where appearance is particularly important. The present invention relates to a film having pearlescent luster.

[Conventional technology]

BACKGROUND ART Conventionally, a beautiful pearl-like luster has been imparted to films whose appearance is important.

One way to express pearlescent luster is to use a pearlescent enhancer,
For example, plate-shaped crystals such as guanine from fish scales, talcum powder, various lead salts, mica, and titanium-based varnishes were generally applied or kneaded onto the surface of the object as a paint. Furthermore, the following films are known as films having metallic luster.

1) A film with a thin metal film laminated on a film base, or a film with a specially processed back surface.

2) A method of obtaining FuClum by mixing polyethylene terephthalate and polystyrene at a certain ratio and stretching the mixture at a temperature range above the second-order transition temperature of polyethylene terephthalate and below the second-order transition temperature of polystyrene (Japanese Patent Publication No. 49-201
Publication No. 6).

3) A method for obtaining an oriented thermoplastic resin thin film having metallic luster, characterized in that a mixture of polyethylene terephthalate and polyolefin is oriented in at least one direction (Japanese Patent Publication No. 54-29379).

[Problem that the invention seeks to solve]

However, the method of applying or kneading a pearlescent enhancer is difficult to obtain deep pearlescent luster because the pearlescent enhancer is located on the surface and develops pearlescent luster, and also requires expensive pearlescent enhancers. Therefore, it had the disadvantage of increasing costs.

In addition, method 1) usually requires metal vapor deposition, etc.
The process becomes complicated, and the metal peels off from the film substrate.

In method 2), the stretching temperature range for obtaining a film with metallic luster is narrow, so the resulting film has uneven gloss and has an odor that is thought to be due to the addition of polystyrene.

Method 3), like 1) and 2), has a metallic luster and an unfavorable appearance.

Mixed with 10-99% polyester resin and 1-90% by weight
Due to the weight percentage, the obtained film had poor cellophane resistance and therefore had poor printing suitability.

Furthermore, since there is a large amount of resin other than polyester resin, the properties of polyester resin are lost, and the film moldability is also poor. Furthermore, since the transparency of the film is poor, there are problems such as a deep pearlescent film cannot be obtained.

Furthermore, in all of the above conventional techniques, although the material itself such as a film has metallic luster or pearl luster, it is formed opaque due to the high content of pearl material, and the contents of the package or the printed matter pasted together are opaque. cannot be seen from the outside.

In addition, all of the conventional technologies contain a large amount of resin other than polyester resin, which changes the physical properties of the polyester resin, resulting in poor film moldability, such as uneven thickness during film molding. There was a problem.

A technical object of the present invention is to provide a translucent resin film having pearlescent luster that solves the above-mentioned problems.

[Technical means taken to solve the technical problem of the invention] The technical means taken to solve the technical problem is a film made of a thermoplastic resin, where the thermoplastic resin is a polyester resin. It is a composition in which 0.01 to less than 1% by weight of polymethylpentene is added to 99 to 99.99% by weight, and it is formed into a film by biaxial stretching.

[Function] Since the present invention blends a small amount of polymethylpentene into the polyester resin, it maintains the excellent physical properties, moldability, and transparency of the polyester resin, and
The lack of pearlescent properties due to the addition of a small amount of polymethylpentene can be improved by orienting polymethylpentene in two axial directions through biaxial stretching, and the strength of the resulting film can also be improved. becomes possible.

〔Example〕

The polyester resin in the present invention is a commonly known polyester resin used in biaxially stretched films,
The main target is polyethylene terephthalate, but as part of the components of terephthalic acid, for example, isophthalic acid,
Aromatic dicarboxylic acids such as naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, diphenoxyethane dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylsulfone dicarboxylic acid, etc.; Alicyclic dicarboxylic acids such as hexahydroterephthalic acid, hexahydroisophthalic acid, etc.: adipine , cepatic acid, azelaic acid, etc.; p-β-hydroxyethoxybenzoic acid, ε
- other difunctional carboxylic acids such as oxyacids such as oxycaproic acid and/or as part of the ethylene glycol component, such as trimethylene glycol, tetramethylene glycol, hexamethylene glycol, decamethylene glycol, neopentylene gellicol; .

Diethylene glycol, triethylene glycol, ■・
1-Cyclohexanedimethylol.

l,4-cyclohexanedimethylol, 2,2-bis(
One or more polyfunctional compounds such as other glycols such as 4-β-hydroxyethoxyphenyl)propane, bis(4-β-hydroxyethoxyphenyl)sulfone, etc., and functional derivatives thereof, in an amount of up to 20 mol%. It may also be a polymerized one.

The polyester resin used in the present invention may be any polyester resin that can be formed into a biaxially stretched film (
Most preferred is polyethylene terephthalate.

The polymethylpentene in the present invention is TPX, which is commercially available as -U, and is a polyolefin based on 4-methylpentene 1.

The film forming method may be any method for producing a biaxially stretched polyester film, such as a one-way tenter method (flat method) for producing a polyester film, or biaxial stretching using a tube method.

Prototype polyester resins; Tenite7741 Eastman TPX; MXOO2 Mitsui Petrochemical Industries, Ltd. were mixed. These compositions are extruded into an outer diameter of 25 mm by extruder.
Extrude it into a pipe shape with an inner diameter of 22 mm, melt it, weld one end, and pressurize air into the vibrator.
Stretch and expand the pipe 2 to 4 times vertically and horizontally to a thickness of 150 to 2
A 50 μm film was obtained.

As a comparative example, a film was produced by adding 0.5% of the following polyolefin to a polyester resin.

PP: Chisso Ni-7011 HDPE, Shorex 5003 Showa Denko LDPE: Sumirikisen F412-1 Sumitomo Chemical ■ Appearance observation The obtained biaxially stretched film was visually observed for pearlescent luster and cellophane test results were obtained. As shown in the table.

77 / (D rlt11L Child Table 1 Results of Pearlescent Observation of Film Film Thickness 200μm Pearlescent Evaluation 0; Excellent Pearlescent ○; Good Pearlescent △: Slightly Poor Pearlescent TPXl, pearlescent when added 0% or more has no depth,
It exhibits a glittering pearlescent luster.

Evaluation of Cellotape Test Cellotape was attached to the film, and the surface of the film was observed when it was rapidly peeled off.

O: No change △; Part of the film flakes off ×: Film flakes off, unsuitable for printing Evaluation of high-feed feeling ○: Excellent △; Slightly poor X: Poor Light transmittance measurement Table 2 shows the results of the prototype film. This is data obtained by measuring light transmittance as shown below.

Measuring device: Hitachi Ltd. U-3410 self-recording spectrophotometer Measurement wavelength: 800 nm Film thickness: 200 um Table 2 Light transmittance measurement results n = 5 From the results in Table 2, Beer-Lambert law using
The extinction index shown in Table 3 was determined from the light transmittance and graphed as shown in FIG. 1.

-l og - = -1ogT: At = -rb O IO: I; T; At; Te 0 b; Light intensity before transmission Light intensity after transmission Transmission rate Absorption index Turbidity coefficient Thickness Pearlescence Since there is a correlation with the absorption index of the film of the composition, the absorption index representing the amount of TPX added and the degree of pearlescence is shown in Table 3 and the graphs of FIGS. 1 and 2.

Table 3 Extinction index of each sample n = 5 Measurement of brightness Brightness (L
) was measured. Table 4 shows the data obtained by measuring the lightness (L) of the prototype film.

Measuring device: Hitachi C-2000 color analyzer Wavelength: 380 to 780 nm Film thickness: 200 μm Table 4 Lightness (L) measurement results for each sample n = 5 The data in Table 4 is shown in the graph in Figure 3. .

From Tables 2, 3, and 4, and FIGS. 1, 2, and 3, the measurement results of the extinction index and brightness show similar trends.

When TPXo is added in an amount of 5% by weight or more, the pearlescent luster improves, but the transparency becomes less (and the pearlescent luster becomes less deep), and as the addition of TPX increases, the pearlescent luster becomes glittery
The sense of luxury is lost and the appearance is inferior.

Therefore, less than 0.01% by weight of TPXl and O gives good pearlescent luster (0.5 to 0.05% by weight of TPX shows the best pearlescent luster).

Furthermore, in the case of a film, since the biaxial stretching ratio is high, the addition of a smaller amount of TPX can significantly improve the pearlescent luster than in a biaxial blow molding bottle.

From Table 2, Table 3, and Figure 2, polypropylene and polyethylene additive bottles have higher light transmittance than TPX (
(low absorption index), and a considerable amount of resin is required to achieve the same pearlescent luster as TPX.

Transparent films are often used in combination with printed matter. In this case, since the printed matter can be seen through the pearlescent film, the appearance is excellent and desirable, and the pearlescent luster becomes a deep pearlescent luster, resulting in a printed matter with a desirable appearance.

In order to confirm this tendency, the obtained 200LLm
A dark red printed matter was pasted together using this film, and the transparency of the underlying printed matter was observed.

Table 5 shows the results.

Table 5: Transparency of laminated printed matter
If it is added in an amount of 0% by weight or more, the bonded printed matter will not be visible.

Even when 75% by weight of TPXo was added, printed matter was only slightly visible. With 5 to 0.05% by weight of TPXo, the prints look good and the pearlescent luster of the film significantly improves the appearance of the prints.

〔Effect of the invention〕

Therefore, the present invention is a translucent film that has a deep translucent pearlescent luster and can be seen through, so it has an excellent appearance, and since the amount of additive resin added to the polyester resin is small, the physical properties of the polyester resin are improved. Furthermore, compared to conventional films containing pearlescent agents, it exhibits a uniquely deep and luxurious pearlescent luster without the use of expensive pearlescent agents, resulting in lower manufacturing costs. It has excellent effects.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between the amount of TPX added and the extinction index, Figure 2 is a graph showing the relationship between the amount of resin added and the extinction index, and Figure 3 is the relationship between the amount of TPX added and the brightness of the film. This is a graph showing Patent Applicant Shiseido Co., Ltd. Agent Patent Attorney Keiji Matsuura Figure 1 1og I/I. Change in extinction index due to addition of TPX 0.5 Amount of TPX added to PET (TPX%) 1.5 Figure 2 - 1 og I/I. Change in absorbance index due to added resin 0, + 0.2 0.3 Amount of TPX added to PET (TPX%) Figure 3 Change in brightness due to addition of TPX 0.5 Amount of TPX added to PET (TPX%) 1. 5 Procedure Neho Seisho July 13, 1990

Claims (1)

[Claims] A film made of a thermoplastic resin, wherein the thermoplastic resin is a composition in which 0.01 to less than 1% by weight of polymethylpentene is added to 99 to 99.99% by weight of a polyester resin, and the film is formed by biaxial stretching. A film with pearlescent luster that forms into a film.