JPS6239619B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a soft vinyl chloride resin film. More specifically, the present invention relates to a soft vinyl chloride resin film that has improved transparency, printability, and workability, that is, does not easily cause interfacial adhesion during unwinding. Since soft vinyl chloride resin films can be easily processed into various objects, they are widely used for modified packaging, toys, and other miscellaneous goods. However, since soft vinyl chloride resin film contains a large amount of plasticizer, if it is rolled into a roll after being manufactured, the films will stick to each other and will not be processed into packaging bags, toys, or other miscellaneous goods. However, there is a problem in that it is difficult to work with. As a means to eliminate this problem, fine irregularities are added to the film surface during the film manufacturing process.
A technique for imparting a so-called "nashiji pattern" is known. When using this technique, even if the films are rolled, it is possible to prevent the films from adhering to each other. However, it has the disadvantage that the transparency of the product film is significantly impaired and its use is restricted in applications requiring transparency. Although some techniques have been proposed for imparting a satin pattern to the film surface without reducing transparency, these techniques are not yet perfect. As a method for improving the adhesion of softened vinyl chloride resin films to each other, techniques have also been proposed in which fine particles of inorganic substances are blended or a certain type of lubricant is blended. Adding fine inorganic substances can temporarily improve the adhesion of films to each other, but if the film is stored in a roll for a long period of time, the plasticizer will ooze out (migrate) to the film surface. , which has the disadvantage of causing the films to stick together. When adding a certain type of lubricant to the film, it is possible to temporarily improve the adhesion of the films together, but if stored for a long period of time, the plasticizer may ooze out onto the film surface. There is a disadvantage that the films adhere to each other. Under such circumstances, the present inventors have made efforts to provide a flexible vinyl chloride resin film that does not reduce transparency, makes it difficult for films to adhere to each other, and has excellent printability. As a result of this study, we have arrived at the present invention. Therefore, the gist of the present invention is to produce a soft vinyl chloride which is made by blending 20 to 40 parts by weight of a plasticizer and 1.0 to 2.0 parts by weight of an inorganic substance with a fine particle size to 100 parts by weight of a vinyl chloride resin. In the resin film, the above inorganic substance is (a) basic magnesium carbonate.
and (b) 0.1 to 0.5 parts by weight of quartz powder having an average particle size of 1 to 10 μm. Hereinafter, the present invention will be described in detail. In the present invention, the vinyl chloride resin refers to polyvinyl chloride or a copolymer containing vinyl chloride as a main component and other copolymerizable monomers. Examples of the copolymerizable monomer include vinyl acetate, acrylic acid and its esters, methacrylic acid and its esters, maleic acid, crotonic acid, ethylene, propylene, styrene, acrylonitrile, and the like. The soft vinyl chloride resin film according to the present invention contains a plasticizer. Examples of the plasticizer used here include dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dicyclohexyl phthalate, dibenzyl phthalate,
Examples include butyl lauryl phthalate, dilauryl phthalate, dicapryl phthalate, dioctyl phthalate, dioctyl adipate, dioctyl sebagate, other phosphates, epoxies, polyglycol esters, and sebacic acid esters, which may be used alone or in combination of two or more. It can also be used as The amount of these plasticizers added to the vinyl chloride resin ranges from 20 to 40 parts by weight per 100 parts by weight of the resin. If the plasticizer is less than 20 parts by weight, the film's flexibility and elongation properties are unfavorable, and if it is more than 40 parts by weight, the film's flexibility and elongation properties are greatly improved, but the film's strength is poor. In addition, the blowing out (transfer) of the plasticizer from the film becomes undesirable. The soft vinyl chloride resin film according to the present invention contains 1.0 to 2.0 parts by weight of an inorganic substance having a fine particle size. This inorganic substance with a fine particle size consists of (a) basic magnesium carbonate and (b) an average particle size of 1 to 10 μm.
The former (a) is 0.5 to 1.5 parts by weight, the latter (b) is 0.1 to 0.5 parts by weight, and the combined amount is 1.0 to 2.0 parts by weight. Basic magnesium carbonate is (3-5)
It has a composition of MgCO ₃ .Mg(OH) ₂ .(3-7)H ₂ O, and is obtained by adding sodium carbonate to an aqueous magnesium salt solution. The average particle size of this material is preferably in the range of 0.5 to 3 microns. Basic magnesium carbonate has fine particles that do not separate into individual particles but are assembled into clusters of grapes, and even when blended with vinyl chloride resin and made into a film, it can be made into clusters of grapes. A set cannot be destroyed. The plasticizer blended into the vinyl chloride resin is absorbed into the cluster-shaped spaces of the grapes, so it is thought that the amount of plasticizer blowing out onto the film surface is reduced. Also,
It is thought that the plasticizer blown onto the film surface is attracted to the grape-like voids of basic magnesium carbonate present on the film surface, thereby improving the adhesion. The soft vinyl chloride resin film according to the present invention contains basic magnesium carbonate and quartz powder having an average particle size of 1 to 10 μm. This shows that even if only basic magnesium carbonate is mixed,
Since the purpose was not fully achieved, a small amount of quartz powder was added as the inorganic substance (b). This (b)
The quartz powder produces irregularities on the surface of the film that cannot be seen with the naked eye, which functions to prevent the films from adhering to each other and to help the printing ink to adhere to the film surface. The quartz powder used as the component (b) has an average particle size in the range of 1 to 10μ, and if this average particle size is smaller than 1μ or larger than 10μ,
The object of the invention is not achieved. Setting the total amount of component (a) and component (b) to 1.0 to 2.0 parts by weight based on 100 parts by weight of the resin, and setting the distribution ratio of both components as described above, will inhibit the transparency of the film. This is to prevent films from adhering to each other and to improve the printability of the film. For example, a film with an inorganic substance content of 2.0 parts by weight or more will have poor gloss, increased haze, loss of transparency, and reduced tear strength. This is not preferable because the phenomenon of clouding becomes more likely to occur. It goes without saying that the soft vinyl chloride resin film according to the present invention may contain other additives of a type and amount that do not adversely affect the film. The soft vinyl chloride resin film according to the present invention has the following characteristics and has extremely high industrial utility value. (1) Although the soft vinyl chloride resin film according to the present invention contains a large amount of plasticizer, there is little blowing out (transfer) of the plasticizer to the film surface, and the films are unlikely to adhere to each other. . Therefore, the unwinding operation of the rolled film and the subsequent film processing operation can be carried out smoothly. (2) Since the softened vinyl chloride resin film according to the present invention contains only a small amount of two types of fine inorganic substances with different properties, the film does not have poor gloss, has little haze, and is transparent. is not significantly damaged. (3) The soft vinyl chloride resin film according to the present invention does not contain an organic lubricant, and the fine particles are exposed on the film surface, so printing ink adheres well and printability is improved. Become something. Hereinafter, the soft vinyl chloride resin film according to the present invention will be described in detail based on Examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Examples 1-2, Comparative Examples 1-9 Polyvinyl chloride (=800) 100 parts by weight dioctyl adipate 35 Epoxy plasticizer 3 Barium-zinc stabilizer 2 A fine particle size was added to the composition. Inorganic substances were blended in the proportions shown in Table 1. 160% of this formulation
After kneading for 7 minutes with processing rolls heated to ℃,
The film was 0.1 mm thick. Regarding the film obtained in this way,
Table 1 shows the results of measuring various properties using the following methods. <Appearance> Observed with the naked eye. <Haze> Multiple sheets of 0.1 mm film are stacked together to form a 1 mm thick sheet using a compression molding method, and this sheet is measured using a digital haze meter manufactured by Tokyo Denshoku Co., Ltd., and scattering relative to transmittance is measured. Expressed as a percentage of light (%). A smaller value means less haze. <Slip resistance> Surface property measuring device HEIDON manufactured by Shinko Tsushin Kogyo Co., Ltd.
-Measured using type 14. A film ( ¹⁵⁰ mm x 50
mm) and slide the chrome plated plate at a speed of 50 m/min, the resistance value at that time is taken as the sliding resistance,
Expressed as value per ^100cm2 (gr). A small number means low slip resistance. <Workability> The difficulty of stacking multiple 0.1 mm films, cutting them, and peeling them off one by one was evaluated as good or bad.

【table】

[Table] From Table 1, the following becomes clear. (1) If the amount of inorganic substances with fine particle size added is small,
Although the appearance of the product film was good, the slip resistance was large and poor, and the workability was also poor (Comparative Examples 2, 3, 5, and 6). (2) When only basic magnesium carbonate was used as the inorganic substance (Comparative Examples 2, 3, 4) and when only quartz fine powder was used (Comparative Examples 5, 6,
7 and 8), the former has no adverse effect on the appearance or haze of the product, but the latter has more significant improvements in slip resistance and workability (Comparative Example 2).
and Comparative Example 6, Comparative Example 3 and Comparative Example 7, Comparative Example 4 and Comparative Example 8). (3) The film according to the present invention has a good appearance, little haze, low slip resistance, and good workability. In particular, it can be seen that the slip resistance and workability exhibit synergistic effects that could not have been predicted from the properties of films containing either basic magnesium carbonate or fine quartz powder alone. Examples 3 to 6, Comparative Examples 10 to 11 Polyvinyl chloride (=800) 100 parts by weight dioctyl phthalate 20 epoxy plasticizer 3 barium-zinc stabilizer 2 Inorganic substances were blended in the proportions shown in Table 2. 160% of this formulation
After kneading for 7 minutes with processing rolls heated to ℃,
The film was 0.1 mm thick. The appearance, haze, slip resistance, and workability of the film thus obtained were measured in the same manner as shown in the previous example. The results are shown in Table 2.

【table】

[Table] From Table 2, the film according to the present invention has a good appearance, little haze, and similar to the results in Table 1.
It is clear that the slip resistance is low and the workability is good.

Claims (1)

[Claims] 1. 20 to 40 parts by weight of a plasticizer and 1.0 to 1.0 parts by weight of an inorganic substance with a fine particle size per 100 parts by weight of vinyl chloride resin.
In the soft vinyl chloride resin film containing 2.0 parts by weight, the inorganic substance is (a) basic magnesium carbonate.
0.5 to 1.5 parts by weight and (b) quartz powder with an average particle size of 1 to 10μ
A soft vinyl chloride resin film comprising a combination of 0.1 to 0.5 parts by weight.