JP2002067497A - Plastic paper for ink jet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic paper for calendar or poster which shows superb adhesive properties with an ink image receiving layer, outstanding suitability for conveyance and water resistance and further, can be used for an ink jet printer. SOLUTION: This plastic paper for the ink jet printer is a polyester film having a formed coating film containing a carboxylic acid base of a specific concentration, an ester copolymer with a specific glass transition temperature, a polyalkylene oxide of a specific molecular weight and a fine particle of a specific particle diameter. The use application of the polyester film is for the calendar or the poster.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to water resistance, transportability,
The present invention relates to a plastic film for a calendar or a poster which can be used for an ink jet printer having excellent adhesiveness.

[0002]

2. Description of the Related Art Conventionally, ink jet paper (for example, high-grade paper manufactured by Fuji Photo Film Co., Ltd.) has been used for calendars and posters that can be used in ink jet printers. It has a drawback that characters and photographs are blurred, and has been used after being laminated with a polycarbonate resin film, a polyacryl resin film, a polyester resin film, or the like. Therefore, there is a need for a plastic paper that can be used for an ink jet printer that does not need to be laminated and has excellent water resistance.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plastic paper which is excellent in water resistance, transportability, and excellent in adhesion to an ink image receiving layer and which can be used for an ink jet printer for a calendar or a poster. To provide.

[0004]

The thermoplastic resin used for the plastic film includes polyethylene, polypropylene, polyacrylic resin, polyester resin, polycarbonate resin and the like. Examples of the white pigment include calcium carbonate, aluminum hydroxide, alumina, silica, titanium oxide, magnesium oxide, zinc oxide and the like. As the additives such as an antioxidant, an ultraviolet absorber and an antistatic agent, general commercial products can be used. A thermoplastic resin, a white pigment, an antioxidant, an ultraviolet absorber, and a charge controlling agent are kneaded with two rolls, pellets are formed with a pelletizer, and stretched at an appropriate magnification using a conventional T-die extruder. The plastic film (thickness 5μm
１００100 μm).

It is desirable that the plastic film of the present invention has excellent transportability and has a small haze. For example, a resin having a haze of 10% or less is preferable, and a polyester resin is preferable as the thermoplastic resin. An aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, ethylene glycol, 1,4- Polyesters obtained by condensation polymerization of glycols such as butanediol and 1,6-hexanediol are preferred, and polyethylene terephthalate is particularly preferred.

A coating film is formed on one side of a plastic film, and the coating film has a ratio of a dicarboxylic acid component having a carboxylate group to the total carboxylic acid component of 1 to 20 mol%.
50 to 80% by weight of an ester copolymer having a glass transition temperature Tg of 20 to 90 ° C. and a molecular weight of 600 to 20
The composition is characterized in that it is a coating film obtained by applying an aqueous liquid mainly containing a component consisting of 10 to 30% by weight of a polyalkylene oxide of No. 00 and 3 to 25% by weight of fine particles having an average particle diameter of 20 to 80 nm on a plastic film. This is plastic paper for an inkjet printer.

In the present invention, an aqueous liquid containing components for forming a coating film is applied to a plastic film. These components contain an ester copolymer, a polyalkylene oxide and fine particles. The ester copolymer is a polyester in which the ratio of the dicarboxylic acid component having a carboxylate group is 1 to 20 mol% based on all dicarboxylic acid components in the molecule. Such ester copolymers include carboxylic acid components such as terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, and 5-Li carboxyisophthalic acid,
Dicarboxylic acid components having a carboxylic acid group such as -Na carboxyisophthalic acid, 5-K carboxy isophthalic acid, and 5-K carboxy terephthalic acid; ethylene glycol, 1,4-butanediol, 1,6-hexanediol, and bisphenol A Is a polyester composed of a hydroxy compound such as an alkylene oxide adduct.

[0008] In order to improve the hydrophilicity of the ester copolymer, the dicarboxylic acid component having a carboxylic acid salt group is preferably 1 to 20 mol% with respect to all carboxylic acid components, and is preferably 2 to 20 mol%.
~ 14 mol% is more preferred. If the amount of the dicarboxylic acid component having a carboxylic acid salt group is less than 2 mol%, the hydrophilicity of the ester copolymer will decrease, and if it exceeds 14 mol%, the moisture resistance of the coating film will decrease, which is not preferable. Further, the glass transition temperature (Tg) of the ester copolymer is preferably from 20 to 90C. If the Tg is less than 20 ° C., the film may be blocked, and if the Tg exceeds 90 ° C., the transparency and adhesiveness of the film are reduced.

Examples of the polyalkylene oxide include polyethylene oxide and polypropylene oxide. The molecular weight of the polyalkylene oxide is preferably from 600 to 2,000. When the molecular weight is less than 600, the blocking property of the film and the moisture resistance of the coating film decrease, and when it exceeds 2,000, the adhesion to the ink image receiving layer decreases.

The fine particles are preferably organic or inorganic compounds having a particle size of 20 to 80 nm. Examples of such fine particles include calcium carbonate, calcium oxide, aluminum oxide, silicon dioxide, zinc oxide, molybdenum disulfide, metal stearate, cross-linked acrylic resin particles, cross-linked polystyrene resin particles, and low-molecular-weight fluororesin (Rublon). No. If the particle size of the fine particles is less than 20 nm, the film may be blocked, and if it exceeds 80 nm, the transparency is reduced.

In the present invention, in addition to the above components, an antistatic agent, a pigment, a surfactant, an ultraviolet absorber and the like can be blended. The solid concentration of the aqueous liquid is usually 30% by weight or less, and more preferably 10% by weight or less.

In the present invention, an aqueous liquid is applied to a plastic film. The plastic film is preferably a plastic film uniaxially stretched in the extrusion direction. A conventional method can be used as a coating method. The coating amount is preferably 0.5 to 20 g per m ² of the film,
1 to 10 g is more preferred. The aqueous liquid is preferably used as an aqueous dispersion or dispersion. Plastic film coated with aqueous liquid is
After drying for 10 to 10 seconds, stretching is preferably performed at a temperature of 90 to 130 ° C. at a stretching ratio of 3 to 5 times in the vertical axis direction and 3 to 5 times in the horizontal axis direction. The thickness of the plastic film treated in this manner is 50 to 150 μm, and the thickness of the coating film is 0.02 μm.
１1 μm is preferred.

[0013]

EXAMPLES The present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, each characteristic value was measured by the following method. Adhesion: Apply the ink image receiving layer to one side of the plastic film so that the thickness after drying becomes 20 μm, and then dry.
Adhesion was evaluated according to IS-C2701. 〇: No peeling is observed at all △: Peeling is partially observed ×: Peeling is particularly noticeable Friction coefficient: 1 kg load according to ASTM D 1894-63 using a slipper measuring device manufactured by Toyo Tester Co.
Was added to measure the coefficient of static friction. Blocking property: Two films of 50 mm width are stacked,
1 under a load of 50 kg / cm ² , 40 ° C. and 50% RH
After treatment for 7 hours, peel strength (g / 50m
m) was measured. Good blocking property: peel strength ≦ 10 g Blocking property: slightly good: 10 g <peel strength ≦ 30 g Poor blocking property: 30 g <peel strength Light transmittance and haze: HR- manufactured by Murakami Color Research Laboratory
It was measured by a 100 type haze meter according to ASTM D1003. Glass transition temperature: Measured with a thermal analyst 2000 type differential calorimeter manufactured by DuPont at a heating rate of 20 ° C./min. Intrinsic viscosity: 3 using orthochlorophenol as solvent
It was measured at 5 ° C. Water dispersibility: The coating liquid was diluted with water to obtain a 0.2% by weight aqueous dispersion, and the light transmittance was measured using a quartz cell with a double beam spectrophotometer 228A manufactured by Hitachi, Ltd. Good water dispersibility: light transmittance ≧ 50% Good water dispersibility: 50%> light transmittance ≧ 30% Poor water dispersibility: light transmittance <30% Humidity: 60 ° C.
The peel strength was measured in the same manner except that the treatment was performed at 70% RH for 17 hours. Good moisture resistance: Peel strength ≦ 10 g Good moisture resistance: 10 g <Peel strength ≦ 30 g Poor moisture resistance: Peel strength> 30 g

Example 1 100 parts by weight of polyethylene terephthalate resin, 30 parts by weight of calcium carbonate, 30 parts by weight of aluminum hydroxide,
10 parts by weight of titanium oxide, 0.5 parts by weight of an antioxidant, 0.3 parts by weight of an ultraviolet absorber and 0.5 parts by weight of an antistatic agent are kneaded with a two-roll mill at 210 ° C. for 10 minutes, cooled to room temperature, and then pelletized. To produce pellets having an intrinsic viscosity of 0.76, and stretched 3.5 times in the longitudinal direction with a T-die extruder to obtain terephthalic acid (60 mol%) and isophthalic acid (37 mol%).
Mol%), trimesic acid monomethyl ester (5
-Synthesized from chloroisophthalic acid and methyl formate) (3
Mol%), ethylene glycol (40 mol%), neopentyl glycol (40 mol%), and an ethylene oxide adduct of bisphenol A (20 mol%) to obtain a polyester. This polyester is dissolved in tetrahydrofuran, a 20% aqueous sodium hydroxide solution is gradually added with stirring, the mixture is cooled to room temperature after heating and stirring, methanol is added to cause coagulation and drying under reduced pressure.
An ONa group-containing polyester copolymer was synthesized. (Hereinafter referred to as A) (Tg = 31 ° C.) 65% by weight of the polyester copolymer A synthesized above, 16% by weight of polyethylene oxide (P) having a molecular weight of 1000, and an average particle diameter of 40 n.
m low molecular weight fluororesin (Rublon manufactured by Daikin Industries, Ltd.)
An aqueous liquid having a solid concentration of 4% by weight consisting of 10% by weight and polyethylene nonyl phenyl ether of 9% by weight is applied to one surface of the polyester film, dried, stretched 4 times in the horizontal axis direction, and heat-treated at 230 ° C. And thickness 10
A 0 μm biaxially stretched film was produced. The thickness of the coating film was 0.03 μm. Table 1 shows the characteristics of this film.

Comparative Example 1 A biaxially stretched polyester film was prepared in the same manner as in Example 1 except that the aqueous liquid was not applied. Table 1 shows the characteristics of this film.

Examples 2 to 7 Except that the types and ratios of the coating agents were changed as shown in Table 1,
A biaxially stretched polyester film was produced in the same manner as in Example 1. Table 1 shows the characteristics of this film.

[0017]

Table 1 Characteristics of the polyester film of the present invention

[0018]

The plastic film of the present invention has excellent adhesiveness between the ink image receiving layer and the base film, and furthermore has excellent water resistance and transportability. Therefore, plastic paper for ink jet printers, especially calendars and posters. Suitable for

Claims (2)

[Claims] 1. A thermoplastic resin, a white pigment, an antioxidant,
A film in which a coating film is formed on one surface of a plastic film comprising an additive such as an antistatic agent, wherein the coating film has a ratio of a dicarboxylic acid component having a carboxylate group to all carboxylic acid components of 1 to 20 mol%. 50-80% by weight of an ester copolymer having a glass transition temperature of 20-90 ° C., 10-30% by weight of a polyalkylene oxide having a molecular weight of 600-2000, and an average particle size of 20-80 nm.
A plastic sheet for an ink jet printer, characterized in that the sheet is a coating film obtained by applying an aqueous liquid mainly containing a component consisting of 3 to 25% by weight of fine particles of the above to a plastic film. 2. The plastic paper for an ink-jet printer according to claim 1, wherein the fine particles are molybdenum disulfide or a low molecular weight fluororesin.