JPH07110913B2 - Printing ink adhesion prevention sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet exhibiting a sufficient adhesion preventing effect on printing ink for color copying, heat-sensitive facsimile and the like.

[0002]

2. Description of the Related Art Conventionally, a soft vinyl chloride sheet for the purpose of preventing the adhesion of printing ink is disclosed in JP-A-58-162.
As disclosed in Japanese Patent No. 650 and Japanese Patent Laid-Open No. 59-155450, there is a vinyl chloride sheet to which an amide lubricant is added.

However, since these vinyl chloride sheets contain a plasticizer, the plasticizer migrates to the surface of the sheet, becomes sticky, and adsorbs the ink of the printed matter in contact with the sheet. Although it has a certain effect in a copying machine, it cannot sufficiently exert the effect of preventing the printing ink from adhering to a color copy or a thermal facsimile.

Therefore, the present inventors have focused their attention on a sheet that does not use a plasticizer, which greatly affects the adhesion of printing ink.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a means thereof is a mixture of a polyurethane-polyvinyl chloride copolymer resin and a polyvinyl chloride resin.
It is a sheet-shaped product by adding 0.3 to 2.0 parts by weight of an amide lubricant to 0 part by weight.

[0006]

EXAMPLES To explain an example of the practice of the present invention, a polyurethane-vinyl chloride copolymer resin is used in the presence of polyurethane.
It is a resin that is graft-polymerized with vinyl chloride monomer.
Te, polyester polyols as polyurethane component contained in the copolymer resin, and polyols such as polyether polyol, diphenylmethane diisocyanate consists of the reaction product of a diisocyanate such as hexamethylene diisocyanate, this copolymer resin
The polyvinyl chloride resin to be mixed is a polymer mainly composed of vinyl chloride monomer and preferably has a degree of polymerization of about 400 to 1000. When the degree of polymerization becomes large, problems such as fisheye when molded into a sheet May occur, which is inconvenient.

The mixing ratio of the polyurethane-polyvinyl chloride copolymer resin and the polyvinyl chloride resin can be arbitrarily selected depending on the hardness of the polyurethane-polyvinyl chloride copolymer resin and the degree of polymerization of polyvinyl chloride. -It is preferable that the content of the polyvinyl chloride resin is in the range of 20 to 100 parts by weight with respect to 100 parts by weight of the polyvinyl chloride copolymer resin. Beyond this range and increasing the proportion of polyurethane,
The problem of stickiness on the sheet surface occurs. Further, when the proportion of polyvinyl chloride is increased, a problem may occur in the hardness of the sheet, and the above range is preferable.

An amide lubricant is added to a mixture of such a polyurethane-polyvinyl chloride copolymer resin and a polyvinyl chloride resin. In this case, 0.3 to 2.0 parts by weight of the amide lubricant is suitable for 100 parts by weight of the mixture of the above-mentioned polyurethane-vinyl chloride copolymer resin and polyvinyl chloride.

The amide type lubricant has a form well known in this technical field, and is a lubricant having a CONH group, for example, a bisamide such as methylenebisstearic acid amide, ethylenebisstearic acid amide, ethylenebisuraric acid amide. In addition to the system, well-known ones such as a diamide type and a monoamide type can be used. This amide lubricant is a mixture of polyurethane-vinyl chloride copolymer resin and polyvinyl chloride.
0.3 to 2.0 parts by weight is added to 100 parts by weight. If it is less than 0.3 parts by weight, the effect of preventing ink from adhering is poor, and if it exceeds 2.0 parts by weight, the powder is poorly wiped out, which is not preferable. Is.

Next, specific embodiments of the present invention and comparative examples are shown, and the ink adhesion effects thereof are shown in Tables 2-5.

As shown in the table, 100 parts by weight of a mixture of polyurethane-vinyl chloride copolymer resin (Dominus manufactured by Tosoh Corporation) and polyvinyl chloride was added to No.4342 (phosphorus chelator compound manufactured by Akishima Chemical Co., Ltd.) as a heat stabilizer . ) Is 0.6 parts by weight,
No. 6226 (Organic compound which is liquid and has Ba in the molecule ... Aroma
1.0 part by weight of Ba salt of aromatic carboxylic acid , No. 6227 (powder)
An organic compound containing Ba or Zn in the molecule ... Ba-Zn fat
Acid salt) , 2.6 parts by weight in total, 4.2 parts by weight, and a mixture of methylenebisstearic acid amide were kneaded with a test roll (150 [° C] x 5 [min]), and then the thickness was adjusted to about 0.4.
The sheet was thinned to m / m and pressed to form a sheet having a smooth sheet surface.

[0012]

[Table 1]

As a printing ink adhesion test, a sheet cut into a 5 cm × 5 cm mold from the above-mentioned sheet and a thermosensitive facsimile paper and a color copy paper cut into the same mold were placed side by side with a glass plate sandwiched between them to obtain a weight of 2.5 kg. Load of 60 ℃
It was left for 8 hours in a thermostatic chamber and then cooled to check the adhesion of the printing ink.

Evaluation method of contamination with color copy paper (○) No ink adhered (△) Partially ink adhered (×) Total ink adhered

Method of evaluating stain resistance to thermal facsimile paper (○) Printing does not fade at all (△) Printing fades partially (×) Printing disappears partially

Further, as the evaluation of the state of the sheet, the transparency and the dusting of the powder from the surface of the sheet are evaluated.

Evaluation Method of Transparency Good Transparency (○) Slightly cloudy (△) Fairly cloudy (×)

Evaluation of powder spilling from the sheet surface No spilling (○) Slightly spilling (△) Sufficient squeezing (x)

Evaluation of Hardness Soft PVC (30 or more in DOP conversion) (○) Semi-hard PVC (30 or less in DOP conversion) (△)

Evaluation of stickiness: No sticky feel after sheet molding (○) Sticky feel after sheet molding (×)

[0021]

[Effect] According to the present invention, 0.3 to 2.0 parts by weight of an amide lubricant is added to 100 parts by weight of a mixture of a polyurethane-vinyl chloride copolymer resin and polyvinyl chloride. Therefore, a soft film can be prepared without compounding a plasticizer. In addition, it is possible to provide a transparent sheet which has an excellent effect of preventing the adhesion of printing ink by a color copy, a heat-sensitive facsimile, etc., which has been obtained in the past, and which can exert its function for a long period of time. .

[Table 2]

[Table 3]

[Table 4]

[Table 5]

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area C08L 75/04 NGG

Claims (1)

[Claims] 1. A printing ink adhesion preventive sheet comprising 0.3 to 2.0 parts by weight of an amide lubricant added to 100 parts by weight of a mixture of a polyurethane-vinyl chloride copolymer resin and a polyvinyl chloride resin.