JPS6251475A - Matte film - Google Patents

Abstract

PURPOSE:To enhance the impact resistance of a matte layer, by using a specific acrylic polyol resin, a cellulosic resin and an isocyanate prepolymer as a binder. CONSTITUTION:A matte layer containing an acrylic polyol resin with a glass transition temp. of 40-65 deg.C, a cellulosic resin, an isocyanate polymer and a matte agent is provided on a plastic film support. By this method, the matte layer, wherein the impact resistance of a film is improved and adhesiveness, surface hardness, solvent resistance, curl stability and heat stability heretofore required are good and an effect on a ziazo photosensitive layer is reduced, is obtained. In this case, if the acrylic polyol resin with a glass transition temp. of 40 deg.C or less is used, film hardness is increased and a drying property becomes inferior and, if one with a glass transition temp. of 65 deg.C or more is used, the impact resistance of the film is inferior and a crack easily develops on the film.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a matte film, and more specifically, it is used as a support for drafting trafting films, PPC transfer films, second original film for diazo copying, etc. This relates to a matte film.

[Conventional technology]

Mantle film is generally a plastic film support with a resin binder and a mantle agent containing a pigment such as silica powder or alumina powder as a matting agent.The binder is, for example, an acrylic resin, vinyl chloride-vinyl acetate copolymer. Vinyl thermoplastic resins such as
136363, Japanese Patent Publication No. 50-1152, etc.), formaldehyde thermosetting resins such as melamine resin, phenol resin (Japanese Patent Publication No. 50-38771, Japanese Patent Publication No. 50-1416, etc.)
No. 83, etc.) and thermosetting urethane resins (JP-A-60-12)
No. 9257) is known.

This kind of cloak film is used as a support for trafting film for drafting, transfer film for PPC (electrostatic copying machine), second original film for diazo copying, etc., so it is especially suitable for preventing peeling between the eyebrows during use. The matte layer should have good adhesion to the support, high surface hardness to prevent scratches during use or addition, and should not be attacked by toner image correction fluid (organic solvent used) when used as a transfer film. In addition to being solvent resistant, the toner image must also be thermally stable so that it does not generate strange odors or discolor when it is heat-fixed, and from a quality standpoint, it also prevents double feeding and jams (IF) in the copying machine. In terms of this, there should be little curling during use or storage (good curl stability), and when used as a support for the second original film, there should be no risk of damage to the diazo photosensitive layer, such as a decrease in image density, during storage. Although the performance has been traditionally required to be less affected, in addition to this, the mantle layer may crack or turn white due to bending during handling, impact from bevels, etc. It is required to have impact resistance that does not significantly reduce its value.

[Problem that the invention seeks to solve]

However, conventional matte films do not satisfy these properties at the same time; for example, those using a vinyl thermoplastic resin as a binder have poor adhesion to a support and poor solvent resistance.

Further, those using formaldehyde-based thermosetting resins generate irritating formaldehyde gas during heat fixing of toner images, making the work environment worse.

Additionally, when using acrylic polyol resins and isocyanate thermosetting resins that have a high glass transition temperature (70°C or higher), the matte layer tends to crack and break, and whitening can be seen on the surface, significantly reducing the product value. It had the disadvantage of letting you do it.

[Means for solving problems]

The present invention was devised for the purpose of providing a matte film that can solve the problems of the prior art as described above. It is the imparting of sex,
At the same time, it satisfies the conventional requirements of adhesion, surface hardness, solvent resistance, curl stability, and thermal stability.
The object of the present invention is to provide a matte film that has little influence on the diazo photosensitive layer, and contains an acrylic polyol resin with a glass transition temperature of 40 to 65°C, a cellulose resin, an isocyanate prepolymer, and a mantle agent on a plastic film support. It is characterized by providing a covering layer.

[Structure of the invention]

The matte film of the present invention is characterized in that a matte layer containing an acrylic polyol resin with a glass transition temperature (Tg) of 40 to 65°C, a cellulose resin, an isocyanate prepolymer, and a matting agent is provided on a plastic film support. That is.

The acrylic polyol resin used in the present invention is a copolymer of a hydroxy group-containing monomer and other polymerizable polymers, and together with an isocyanate prepolymer, is a material for a thermosetting polyurethane resin.

Improve the impact resistance of the coating film, and obtain a matte layer that has the conventionally required adhesion, surface hardness, solvent resistance, curl stability, and thermal stability, and has little effect on the diazo photosensitive layer. As a result of various studies, the present inventors have found satisfactory results by using an acrylic polyol resin with a glass transition temperature (Tg) of 40 to 65°C in combination with a cellulose resin. Preferably, Glass-transition temperature(
It is an acrylic polyol resin with a Tg) of 50 to 60°C.

When an acrylic polyol resin having a glass transition temperature (Tg) of 40'C or less is used, there is a drawback that the hardness of the coating film is low and the drying properties are poor.

Furthermore, when an acrylic polyol resin having a glass transition temperature (Tg) of 65° C. or higher is used, the impact resistance of the coating film is poor and cracks are likely to occur in the coating film.

The glass transition temperature ('rg) used in the present invention is 50~
The 60°C acrylic polyol resin is, for example, Nippon Reichhold Co., Ltd. (trade name: Acrydec A304. A311
etc.

Examples of cellulose resins used in combination with acrylic polyol resins include nitrate cellulose resin, acetic acid cellulose resin, acetic acid cellulose resin, and propionate cellulose resin, but the solubility of the resin and compatibility with the acrylic polyol resin may vary. In terms of solubility, the most preferred is nitrate cellulose resin, which can be used regardless of the degree of nitrification and the number of seconds (viscosity), but from the viewpoint of workability such as adjusting the coating liquid, it is 1/8 to 10 seconds. (viscosity) is preferred.

The amount of nitrate cellulose resin used is 100% of the acrylic polyol.
15 to 65 parts by weight, preferably 2 parts by weight
It is 5 to 45 parts by weight.

Adding 65 parts by weight or more will improve the adhesion and solvent resistance of the coating.
If the weight is less than 15%, the hardness of the coating film will be poor, and when used as a drafting film, the erasability of a pencil will be poor, which is not preferable.

On the other hand, isocyanate prepolymers include aliphatic and aromatic isocyanate prepolymers, the former including hexamethylene diisocyanate (HMDI) and its derivatives, and the latter including tolylene diisocyanate (TDI), xylene diisocyanate (XDI), etc. .

The product name is Narita Pharmaceutical Co., Ltd.'s Takene) D102.
, D202, DIION, Coronate, Coronate H from Nippon Polyurethane Industries, Parnock DN950 from Nippon Reichhold. Examples include products such as D750.

The mixing ratio of the acrylic polyol resin and the isocyanate prepolymer is an equivalent ratio (NGOloH) of 0.8 to 2.
0, preferably 1.0 to 1.6.

If it is less than 0.8, the adhesion and solvent resistance will be insufficient, and if it exceeds 2.0, the coating film will tend to crack and have poor impact resistance, which is not preferred.

As the mantle agent, powders of silica, glass, alumina, titanium oxide, etc. are used.

The amount used is 30 to 200 parts by weight per 100 parts by weight of the total resin solid content.
Parts by weight are appropriate.

As the support, films of polyester, polycarbonate, cellulose acetate, polyimide, etc. are used.

Depending on the purpose of use, a kneaded film containing titanium oxide, silica, etc. can also be used.

The thickness varies slightly depending on the purpose of use, but generally 25 to 2
Approximately 00μ is appropriate.

The thickness of the matte layer varies depending on the purpose of use, but is generally 5~
Approximately 15μ is appropriate.

In addition, organic solvents for coating include ketones (e.g. acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone), esters (e.g. methyl acetate, ethyl acetate, butyl acetate, glycol acetate, monoethyl ether), aromatic hydrocarbons (e.g. , benzenetoluene, xylene) and the like are preferred.

〔Example〕

Examples of the present invention will be shown below.

Incidentally, part 1% is based on weight. Resins, pigments, etc. used in Examples and Comparative Examples are listed in Table 1.

Table-1 *Tg glass transition temperature The formulations of Examples and Comparative Examples are shown in Table 2.

Table-2 Weight ratio of acrylic polyol/nitrified cotton in Table-2, NGO
The loH equivalent ratio is as follows.

*NC010H: N of isocyanate prepolymer
Ratio of CO group to OH group of acrylic polyol resin After mixing and dispersing the above composition (excluding Takene DIION and Kneepan 22R) in a ball mill for 24 hours, a predetermined amount of Takene 1-D ll0N (Example 1.2
．． Comparative Example 1.2.3) Kneepan 22R (Comparative Example 4) was added to make a coating for forming a cloak layer, and this was coated on a 50μ thick polyester film so that the thickness after drying was 8μ, Dry at 120℃ for 1 minute, then dry at 150℃ for 5 minutes.
A matte film was prepared by heat-treating for a minute to cure the coating film and form a matte layer.

Second, impact resistance, adhesion, surface hardness, solvent resistance, curl stability, thermal stability, and influence on the diazo photosensitive layer for each of the above cloak films (decreased image density after storage as a 2nd thick film) (evaluation) was tested. Table 3 shows the results.
Shown below.

Table-3 Impact resistance: The sample was rubbed by hand 10 times, and the state of cracks that occurred on the mat layer surface was visually observed. O: There was no problem in appearance. After applying cellophane tape to the layer surface, it is peeled off, and the peeling state of the matte layer is evaluated on a five-point scale, with 5 being no peeling and 1 being total peeling.

Surface hardness, according to Jr 55400 pencil hardness test.

Solvent resistance: Number of times the surface of the mat layer was rubbed with MEK-impregnated cotton until the support surface appeared.

Thermal stability: presence or absence of formaldehyde odor when images are continuously transferred and thermally fixed to a sample using a commercially available RPC copying machine.

○: No formaldehyde odor After stacking two sheets so that they are in contact with each other and storing them in an environment of 50°C and 80% RH for 3 days,
Difference in image density when copying with a commercially available diazo copying machine and before storage.

Curl test A: sample (50cm x 50cm) at 20℃, 60℃
Curling properties were measured after being left in an environment of %RH for 30 days. +
indicates that the cloak surface is concave, - indicates that the cloak surface is convex, and the value indicates the maximum distance (N) from the support platform.

○: 3 u or less △: 4 to 9 l ×: 10 mm or more Curl test B: The sample (50 cm x 50 cm) was left in an environment of 70° C. for 1 minute, and then the curling property was measured.

The evaluation is the same as curl test A.

〔effect〕

As is clear from the above description, the cloak film of the present invention not only significantly improves the impact resistance of the mat layer by using a specific acrylic polyol resin, cellulose resin, and isocyanate prepolymer as binders, but also All of the requirements for adhesiveness, surface hardness, solvent resistance, curl stability, and little influence on the diazo photosensitive layer were fully satisfied.

Claims (1)

[Claims] On a plastic film support, a glass transition temperature of 40
A matte film comprising a coating layer containing an acrylic polyol resin at ~65°C, a cellulose resin, an isocyanate prepolymer, and a matting agent.