JP2729698B2 - Recording sheet - Google Patents

Description

The present invention relates to a recording sheet, and more particularly to a recording sheet having suitability for form printing, copying, writing when wet, and suitability for outdoor use. Things.

<Related Art> In recent years, with the remarkable development of the information processing field, various aptitudes have been required for media used therein.

Among these media, the suitability required for the recording sheet is so-called printability (ink absorbency, etc.).
In addition, form printing suitability is added, and copyability,
The suitability for writing when wet and the suitability for outdoor use are desired.

By the way, in order to satisfy these suitability, various physical properties must be provided.

For form printability, it is necessary to make it easy to make holes in the sheet edge, to make perforations, and to make it easy to bend at perforations. Must be provided with water resistance in regard to the writing suitability.

For example, JP-A-63-176174 discloses a coating composition comprising a carboxy knitted polyvinyl alcohol, a filler such as silica, clay and calcium carbonate, and a water-proofing agent on a supporting substrate such as paper, art paper, and cloth. By applying and drying
A recording sheet satisfying ink absorption and water resistance is disclosed.

The recording sheet proposed here is intended to be applied to an ink jet recording system, and describes techniques for imparting ink absorbency and water resistance, but it is suitable for form printing, heat resistance, and toner fixing. No particular consideration was given to the properties and light resistance.

JP-A-58-18639 discloses that a nonwoven fabric obtained by mixing a synthetic fiber and a cellulosic fiber is impregnated with a resin, and then coated with a mixed coating of a thermoplastic synthetic fiber and a crosslinking agent, followed by drying to obtain heat resistance. And a sheet material satisfying toner fixability and water resistance.

The sheet material proposed here is a transfer sheet material applied to a dry-type copying machine, and heat resistance, toner fixing property, water resistance are described, but form printing suitability, ink absorption, No particular consideration is given to light fastness.

<Problems to be Solved by the Invention> In view of these conventional techniques, the present invention has all of printability (ink absorption), form printability, copyability, writing property when wet with water, and outdoor useability. It is an object of the present invention to provide a recording sheet.

<Means for Solving the Problems> The present invention provides a synthetic resin group A on one or both sides of a substrate sheet having a heat melting or heat deformation temperature of 180 ° C. or more.
[Ethylene-vinyl acetate copolymer, acrylic polymer,
One or more synthetic resins selected from vinyl acetate copolymers other than those described above, and one of inorganic fillers selected from inorganic filler group B [calcium carbonate, clay, silica, titanium and barium compounds]. By applying a paint prepared by mixing one or more kinds with a crosslinking agent, a wax, and if necessary, other additives, a recording sheet as the above-mentioned subject is completed.

Particularly important in the means (technique) of the present invention is the base sheet to be used, the heat melting or heat deformation temperature of which must be 180 ° C. or more. Preferred results are obtained when using a fiber-integrated sheet obtained by mixing parts by weight of pulp or a fiber-integrated sheet obtained by mixing 10 to 90 parts by weight of pulp with respect to 100 parts by weight of polypropylene fibers.

Printability of the recording sheet provided by the present invention, the inorganic filler group B (calcium carbonate,
Clay, silica, titanium oxide, and barium compound], which imparts ink absorbency and is developed by this.

The present invention uses, as the base sheet, a fiber-integrated sheet obtained by mixing pulp with polyester fiber or polypropylene fiber as a base, in which the synthetic resin group A and the inorganic filler group B and , A cross-linking agent, wax and other additives are mixed and applied, but the combination of these components provides easy punching, easy perforation, and easy bending. As a result, the form printing suitability is improved.

Furthermore, heat resistance, water resistance, and weather resistance are imparted by a synergistic effect of the base sheet material and the coating composition applied to the coating material, and the coating composition imparts toner fixability and writing properties, thereby providing a dry process. The suitability for a copying machine, the suitability for printing with a laser printer, the suitability for writing when wet, and excellent for outdoor use.

In the present invention, the material of the base sheet is not suitable for dry copying unless its heat melting or heat deformation temperature is 180 ° C. or more, but at the same time as this heat resistance, water resistance,
In order to combine weather resistance, a fiber accumulation sheet formed by mixing pulp with polyester fiber and / or polypropylene fiber is particularly preferable. In this case, the mixing ratio of the pulp needs to be 5 to 90 parts by weight, but if it is less than 5 parts by weight, heat resistance is inferior, and there is a problem in suitability for dry copying machine and printing with a laser printer, etc. If it is larger than the part, the water resistance is inferior and the elasticity by water increases.

Next, in the present invention, the mixing ratio of the synthetic resin of the synthetic resin group A and the inorganic filler of the inorganic filler group B is such that A / B is 100/100.
It is desirably in the range of ~ 20/100.

If it is smaller than 20/100, water resistance and surface strength are not satisfied, while if it is larger than 100/100, printability is not satisfied.

Further, in the paint of the present invention, the content of the wax is a synthetic resin 10
It is necessary to adjust the amount to 1 to 10 parts by weight with respect to 0 parts by weight.
When the amount is more than the weight part, repelling of the ink occurs.

The amount of the paint applied to the base sheet is preferably in the range of 10 to 50 g / m ² per one surface. This is because if the value is 10 g / m ² or less, the smaller the value is, the lower the concealing property and the prevention of ink bleeding cannot be prevented. ^{On the other hand} , if it exceeds 50 g / m ² , the surface strength becomes weak, and characteristics such as picking become poor.

<Examples> Example 1. Thickness obtained by mixing 20 parts by weight of pulp with 100 parts by weight of 0.5 denier polyester staple fiber and making the mixture into paper.
A coating of the following formulation 1 was applied to one side of a wet wet nonwoven fabric of 100 μm, dried and calendered to a dry adhesion amount of 40 g / m ² , to obtain a recording sheet having a thickness of 100 μm.

Example 2.3 Thickness obtained by mixing 50 parts by weight of pulp with 100 parts by weight of 3-denier polypropylene short fiber and making the mixture into paper
One side of a 120 μm wet nonwoven fabric was coated with the paint of the following Formulation 2 so that the dry adhesion amount was 45 g / m ² , dried and calendered to obtain a 120 μm thick recording sheet.

Example 3. To 100 parts by weight of 15 denier polypropylene short fiber, 30 parts by weight of pulp were mixed, and the thickness was made by papermaking.
One side of a 100 μm wet nonwoven fabric was coated with the paint of the following Formulation 3 so that the dry adhesion amount was 35 g / m ² , dried and calendered to obtain a 100 μm thick recording sheet.

In each case, add water to adjust the total solids to 60%.

As described above, the recording sheet obtained in Example 1.2.3 shows the physical properties as shown in Table 1, and is suitable for printing, laser printer printing, dry copier, writing when wet, and outdoor use. Everything was excellent.

<Effect of the Invention> The recording sheet of the present invention satisfies all of printability, form printability, dry copier suitability, writing suitability when wet with water, and suitability for outdoor use. It is extremely useful as a sheet material for copying for dry copiers, for outdoor recording, especially as a sheet material for writing in the rain, or as an outdoor advertising sheet material such as outdoor banners. .

Claims (4)

(57) [Claims] 1. One or two or more synthetic resins selected from the synthetic resin group A and the inorganic filler group B on one or both sides of a substrate sheet having a heat melting or heat deformation temperature of 180 ° C. or higher. One or two or more selected inorganic fillers, a crosslinking agent, a wax, and if necessary, other additives are mixed to form a coating composition. The synthetic resin group A is made of “ethylene-vinyl acetate”. Copolymer, acrylic polymer, vinyl acetate-based copolymer ", wherein the inorganic filler group B is" calcium carbonate, clay such as clay,
A recording sheet characterized by "silica, titanium oxide, magnesium carbonate, and barium compound". 2. The recording sheet according to claim 1, wherein the base sheet is a fiber-integrated sheet material obtained by mixing 5-90 parts by weight of pulp with respect to 100 parts by weight of polyester fiber. 3. The recording sheet according to claim 1, wherein the base sheet is a fiber-integrated sheet material obtained by mixing 10 to 90 parts by weight of pulp with respect to 100 parts by weight of polypropylene fibers. 4. The fiber sheet material according to claim 1, wherein the base sheet is a mixture of 5-90 parts by weight of pulp with respect to 100 parts by weight of a mixture of polyester fibers and polypropylene fibers. Recording sheet according to 1.