JPS5989365A - Coating composition - Google Patents

Abstract

PURPOSE:The titled composition, consisting of a white pigment, an isocyanate compound, an acrylic polyol resin and an acrylic electrically conductive resin containing a quaternary ammonium salt, and capable of avoiding fingerprints to the surfaces of sand matte films or deterioration of nontransparency. CONSTITUTION:A coating composition obtained by incorporating (A) a white pigment, e.g. titanium white, with (B) an isocyanate compound, (C) an acrylic polyol resin and (D) about 10-80wt%, based on the total composition, acrylic electrically conductive resin containing a quaternary ammonium salt in (2:1)- (1:2) weight ratio between the components (C) and (A) and (100:5)-(100:100) weight ratio of the total of the components (A) and (C) to the component (B). The resultant composition is applied to the surface of a mat to give preferably about +5--3% light transmittance after the coating to 0.1-5mum thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides Zandmat foam made of polyester or the like.
The present invention relates to a coating composition that can be applied to the matte surface of a matte film to avoid lipid stains and deterioration of opacity due to fingerprints on the matte film.

Sand matte film is made by applying diamond sand or the like to the surface of a film such as polyester film to roughen the surface and reduce transparency, giving it the ability to write on ships, etc., and it can be used as a drafting tool instead of paper. It is widely used for various purposes.

Sand matte film has excellent properties such as durability, smooth writing performance, and moderate light transmittance, but if it is touched with a finger, etc., fingerprint marks will be very noticeable and the quality will deteriorate. Loss is a serious drawback. The reason why fingerprint marks are noticeable is because moisture and oil from fingers etc. adhere to the sand mat surface and increase the light transmittance. It is thought that this is a very similar phenomenon.

The present inventors have conducted extensive research to improve the phenomenon in which fingerprint marks are noticeable (hereinafter referred to as fingerprint stain resistance), which is a drawback of this sand matte film. The inventors have discovered that the fingerprint adhesion can be improved by coating the sand matte surface of the sand mat film, and have arrived at the present invention.

That is, the present invention is a coating composition in which a quaternary ammonium salt-containing acrylic conductive resin and an incyanate-curing white paint are blended in a weight ratio of about 1:10 to 5:1. Depending on the composition, reduction in opacity can be avoided or reduced. Note that the incyanate-curing white paint herein refers to an acrylic polyol resin and an incyanate compound in which a white pigment represented by titanium white is dispersed, and the composition ratio of the acrylic polyol resin and the white pigment is expressed as a weight ratio. 221 to 1:2 is preferable, and the composition ratio of the acrylic polyol resin in which the white pigment is dispersed and the incyanate compound is 100 in Nl ratio.
The range from :s to too:1oo is preferable.

The effects of the quaternary ammonium salt-containing acrylic conductive resin used in the present invention include the effect of imparting banding and prevention properties and the effect of improving ink coverage.

Such resins are generally obtained by reacting acrylic esters, methacrylic esters, etc. with dialkyl ω-hydroxyethanolamine. 911 For example, dimethylamine acrylate ethylamine or dimethyl 7-minoethylamine acrylate and other acrylic monomers including the above acrylic esters and methacrylic esters are mixed with a lower aliphatic alcohol under a catalyst such as benzoyl peroxide or aliphatic azonitrile. The polymer is then brought into contact with hydrogen halide.
A molecular weight of 2500 that can be obtained by
It refers to a substance having the following chemical structure of 0 to 45,000.

When the molecular weight of the acrylic conductive resin is less than 25,000, the coating composition of the present invention applied to the matte layer of the film has low slipperiness, and the film tends to exhibit a blocking phenomenon. In addition, low-molecular acrylic conductive resins have reduced chemical resistance as a coating film, and are not preferred in practice. Also,
If the molecular weight of the resin is too high, it is not preferable because the compatibility with the incyanate-curing white paint decreases.

There are commercially available acrylic conductive resins that can be used in the present invention (for example, Soken Kagaku Co., Ltd.'s trade names [Nirecondo PQ-50BJ and "Nirecondo PQ-10J").These commercially available products are suitable.

As the incyanate-curable white paint, a mixture of an acrylic polyol resin and a white pigment such as titanium white, and a paint containing an incyanate compound as a main component are preferred from the viewpoint of compatibility with the conductive resin.

The Nl ratio of acrylic polyol and pigment is 2:1 to 1:2.
is preferable, and if it exceeds this range, the whiteness of the coating film will be poor or the strength of the coating film will be insufficient, which is not preferable.

Commercially available incyanate polymers can be used as the incyanate compound;
~100 parts is appropriate.

The effect of incyanate curing is to impart bath agent resistance to the coating.

The compounding ratio of the quaternary ammonium salt-containing acrylic conductive resin and the incyanate-curing white paint is】:】θ~5:
1 is preferred. Incyanate curing white paint l:1
If it is more than 0 (if it is more than 5:1, the antistatic performance will not be achieved and the ink will not adhere properly), if it is less than 5:1 (if it is less than 5:1, the curing will be insufficient, the solvent resistance will deteriorate, and the sand mat after application will be difficult to apply). Both are unfavorable because the transparency of the film is too dull.

When applying the coating composition of the present invention to the matte surface of a sand matte film/L film, the opacity before and after application does not change significantly, and the whitening (opacity ) and coating film thickness. For example, the light KO transmittance after coating will be approximately +5 inches to -30 inches of the light transmittance of the sand matte-uncoated film. Generally, the appropriate thickness of the muscle fabric is 0.1 to 5 μm. It's noticeably better (
In the case of 0,171 @ non-Wli), the anti-fingerprint resistance is too low to be desirable, and a coating film with a thickness exceeding 5 μm flattens the matte surface and impairs the writability of lead paper. becomes.

The invention is further illustrated by examples.

, Example The following composition was uniformly applied to a thickness of 1.1 μm using a percoater on the sand mat surface of a polyethylene terephthalate film (thickness 75 μm), which had been subjected to sand mat processing on one side by a known method. .

The solids concentration of this composition corresponds to 12%.

After applying to the mat surface, dry at 130℃ for 1 minute, and
Table 1 shows the performance of the surface-treated matte film obtained after being left to stand for 20 hours.

As shown in Table 1, it was found that the coating composition of the present invention can dramatically improve fingerprint adhesion while maintaining the performance of the sand matte film.

Claims (4)

[Claims] (1) White pigment, incyanate compound! A coating composition comprising a snout, an acrylic polyol resin, and an acrylic conductive resin containing a quaternary ammonium salt. (2) The coating composition according to claim 1, wherein the quaternary ammonium salt-containing acrylic conductive resin occupies a range of about 1θ to about 80% by weight of the composition. (3) The weight ratio of the acrylic polyol resin and the white pigment is in the range of 2:1 to 1:2, and the weight ratio of the blend of the acrylic polyol resin and the white pigment to the incyanate compound is 100: 5～too:too
2. The coating composition according to claim 1, wherein the coating composition is within the range of . (4) The coating composition according to claim 1 or 3, wherein the white pigment is titanium white.