JP2504909B2 - Vinyl chloride resin composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition having a fluorescent pigment used as a film or sheet for various sundries, stickers, marking films, cosmetics products and the like.

[0002]

2. Description of the Related Art Conventionally, when a fluorescent PVC product is manufactured by calendar molding, the fluorescent color changes extremely during molding, and it is difficult to obtain a stable quality fluorescent PVC product. there were. Therefore, in order to prevent the fading and discoloration of the fluorescent color during the calendar molding of fluorescent PVC products, usually a stabilizer is added, or a processing aid is added, and the temperature of the calender roll is lowered to perform processing. Was used. However, when the amount of the plasticizer is 40 parts by weight or less, high-temperature processing is required, and even if these measures are taken, it has not been possible to completely prevent fading and discoloration of the fluorescent color. On the other hand, if the amount of the plasticizer is increased to 40 parts by weight or more, it is possible to stably maintain the fluorescent color. It does not get greasy or sticky and you cannot get a product of satisfactory quality.

The present invention has been made in view of the above problems of the prior art, and its object is to have 100 parts by weight of vinyl chloride resin, 40 parts by weight or less of a plasticizer and a fluorescent pigment. To prevent fading and discoloration of the fluorescent color of the vinyl chloride resin composition.

[0004]

To achieve the above object, the vinyl chloride resin composition of the present invention comprises a vinyl chloride resin composition containing 100 parts by weight of a vinyl chloride resin, 40 parts by weight or less of a plasticizer and a fluorescent pigment. It is a resin composition to which hydrotalcite is added.

Hydrotalcite is represented by the following composition formula, and has a basic layer [Mg _1-x Al _x (OH) ₂ ].
And an intermediate layer [(CO ₃ ) _{X / 2} · mH ₂ O]. Mg _1-x Al _x (OH) ₂ (CO ₃ ) _{X / 2} · mH ₂ O The addition amount of this hydrotalcite is preferably 0.8 parts by weight or more. In the above equation, x = 0.33,
It is m = 0-0.5.

[0006]

By the ion exchange reaction as shown in FIG. 1, HCl generated from the vinyl chloride resin is captured and inactivated. And the ion exchange reaction between CO ₃ ^2- and HCl is
Mg (OH) ₂ or Al (OH) ₃ is faster than the neutralization reaction rate of HCl with HCl.
Since Cl ₂ and AlCl ₃ are not generated, the promotion of decomposition of vinyl chloride is not promoted and the change of the fluorescent pigment is suppressed. Therefore, fading or discoloration of the fluorescent color can be suppressed.

[0007]

EXAMPLES Examples of the present invention will be described below together with comparative examples. The compounds shown in Table 1 below were used, and these were compounded as shown in Table 2.

[0008]

[Table 1]

[0009]

[Table 2]

Then, in order to investigate the fluorescence fading time,
1 for each compound in Table 2 with a 12 inch test roll
A sheet with a thickness of 0.2 mm is kneaded at 82 ° C. This sheet is taken out from the processing machine every 5 minutes, and the fading of the fluorescent color is visually determined. did. This fluorescent fading time is shown in Table 2. In addition, in order to perform calendering stably, a fluorescent fading time of 20 minutes or more is required.

The following points are clear from Table 2. In all of the examples according to this example, the fluorescence fading time was 2
Since it is 0 minutes or more, calendering can be stably performed.

However, since no hydrotalcite is added to the materials according to Comparative Examples 1 to 5, the fluorescent fading time is short and calendering cannot be stably performed. On the other hand, when the amount of the plasticizer (DOP, epoxidized soybean oil, pigment I) is 40 parts by weight or more as in Comparative Example 6, the fluorescence fading time becomes long. However, in this case, since the amount of the plasticizer is too large, the product becomes too soft and cannot be used.

[0013]

The vinyl chloride resin composition according to the present invention is obtained by adding hydrotalcite to a vinyl chloride resin composition containing 100 parts by weight of a vinyl chloride resin and 40 parts by weight or less of a plasticizer and a fluorescent pigment. Therefore, it is possible to suppress the fading and discoloration of the fluorescent color during calendar processing, and to provide a fluorescent PVC product of stable quality.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an ion exchange reaction of hydrotalcite.

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Claims (1)

(57) [Claims] 1. A vinyl chloride resin composition comprising hydrotalcite added to a vinyl chloride resin composition having 100 parts by weight of a vinyl chloride resin and not more than 40 parts by weight of a plasticizer and a fluorescent pigment.