JP2008194929A - Photoluminescent writing utensil member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoluminescent writing utensil member which can be easily molded regardless of the shape and material quality of the member and also, shows high brightness. <P>SOLUTION: This photoluminescent writing utensil member is composed of a flat glass piece covered with a silicon dioxide on the surface and further, a molded resin composition obtained by blending a thermoplastic resin with a photoluminescent pigment covered with a titanium dioxide. The pigment is not more than 1 μm thick with an average particle diameter of 10 to 200 μm. The blended content of the pigment of the total amount of the resin composition is 0.01 to 5.0 wt.%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glittering writing instrument member. More specifically, the present invention relates to a glittering writing instrument member exhibiting high gloss.

Traditionally, writing instrument members with a metallic luster appearance are the coating of ink containing metal powder and pearl pigment on the molded member, metal deposition and plating, transfer from metal deposition film, metal powder and pearl pigment. The glass flake pigment is kneaded directly into the resin and then molded.
JP 2001-158196 A

  Among these techniques, when the metallic luster is applied by painting, metal vapor deposition, plating, etc., the manufacturing process becomes complicated, and the metallic luster is peeled off due to friction, which may lower the commercial value. In addition, when transferring from a metal vapor-deposited film, various metallic luster colors can be applied, but since the surface shape cannot be transferred to an uneven surface, it can be used only with a member having a specific shape.

On the other hand, in the method of molding after kneading metal powder, pearl pigment, glass flake pigment, etc. directly into the resin, it does not complicate the manufacturing process and gives metal luster at a low cost without choosing the shape of the member. However, in the case of metal powder, since it is necessary to increase the particle diameter in order to increase the glossiness, the roughness of the particles becomes conspicuous in a molded product having many curved surfaces such as a writing instrument member. Since the pearl pigment exhibits only glitter due to reflected light, it has been difficult to obtain glitter in a transparent resin molded product.
In addition, glass flake pigments have a glass piece coated with metal or metal oxide, and exhibit glitter due to reflected light and transmitted light. Therefore, even when added to a transparent resin molded product, the glass flake pigment has a glitter. It is presented.
However, since the glass flake pigment has a high specific gravity (weight per reflection area), there is a problem in dispersibility in the resin. Moreover, since it is easy to crack at the time of shaping | molding, there was a restriction | limiting in the thickness of a molding.

  The present invention solves the above-described problems, and provides a glittering writing instrument member that can be easily formed without selecting the shape and material of the member and exhibits high brightness.

The glitter writing instrument member of the present invention requires that the surface of a flat glass piece is coated with silicon dioxide and further formed by molding a resin composition in which a glitter pigment coated with titanium dioxide is blended in a thermoplastic resin. And
Furthermore, it is required that the glitter pigment has a thickness of 1 μm or less and an average particle diameter of 10 to 200 μm, and the glitter pigment is blended in an amount of 0.01 to 5.0% by weight in the total amount of the resin composition. .

  According to the present invention, it is possible to easily form without selecting the shape and material of the member, and it is possible to obtain a glittering writing instrument member exhibiting high gloss.

The glitter pigment used in the present invention is a two-layer coating type pigment in which the surface of a flat glass piece is coated with silicon dioxide and further coated with titanium dioxide.
Since the silicon dioxide has higher hardness than glass and is excellent in acid resistance, even if the thickness of the glass piece serving as the core is reduced, it can be maintained in a state where it is difficult to break (specifically, a thickness of 1 μm or less). Therefore, the weight per reflection area can be reduced, and the light transmittance of the pigment can be improved.
Therefore, compared with the case of using conventional glass flake pigments, the same amount of addition can exhibit higher brilliancy as the light transmission is improved, and the resin kneading is accompanied by the decrease in fall due to the weight reduction of pigment particles. Dispersibility at the time and molding is improved.

As the luster pigment, those having an average particle diameter of 10 to 200 μm are suitable. When the particle diameter is larger than 200 μm, the surface of the writing instrument member is rough and rough, and when it is smaller than 10 μm, it is difficult to give high brightness to the writing instrument member.
Moreover, the said luster pigment is mix | blended in 0.01-5.0 weight% in the resin composition whole quantity. If the amount is less than 0.01% by weight, it is difficult to obtain high glitter on the entire surface of the writing instrument member, and if added over 5.0% by weight, it is difficult to obtain strength as a writing instrument member due to a decrease in the amount of resin. Breaks and cracks are likely to occur.

  Examples of the bright pigments include trade names “Miraval” manufactured by Merck & Co., Inc .: 5311 Scientific White, 5411 Magic White KU28, 5420 Magic Gold, 5421 Magic Copper, 5422 MagicL, 5423 MagicL, 5423 MagicL, 5423 5426 Magic Green and the like.

  As the thermoplastic resin, one kind or two or more kinds of conventional ones are used. Specifically, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polycarbonate, polymethyl methacrylate, 6-nylon, 6,6-nylon, acrylonitrile-styrene copolymer resin, acrylonitrile-butadiene-styrene copolymer Examples thereof include resins and various thermoplastic elastomers.

  The said thermoplastic resin is mix | blended in the ratio of 80-99.5 weight% in the resin composition whole quantity. If the amount is less than 80% by weight, it is difficult to obtain strength as a writing instrument member, and breakage and cracks are likely to occur at the fitting portion. If the amount is more than 99.5% by weight, the amount of glitter pigment added decreases, and the member It is difficult to obtain the glitter.

  Further, in the thermoplastic resin, in addition to the glitter pigment, pearl pigments or iron powders that have been coated with one or more coatings of iron oxide or titanium oxide on the surface of mica such as natural mica and synthetic mica, alumina, glass pieces, etc. General-purpose colorants such as metal powder such as aluminum powder, various dyes and pigments can be used in combination.

In addition, various additives such as a dispersant, an ultraviolet absorber, an antioxidant, a stabilizer, a wax, and an antiaging agent can be appropriately blended with the thermoplastic resin as necessary.

The resin composition containing the glitter pigment and the desired additive is formed into pellets, powders, etc. by injection molding, extrusion molding, blow molding, cast molding, etc. A glittering writing instrument member exhibiting
The glitter writing instrument member is used in the form of a cap, a shaft cylinder, a pen core, a pen tip holder, a grip, a crown, a tail plug, a clip, a refill pipe, and the like, and constitutes a writing instrument.

  Examples are shown below. In addition, the part in an Example is a weight part.

Example 1
A glittering pigment formed by coating the surface of a flat glass piece with silicon dioxide and further coating with titanium dioxide (manufactured by Merck, trade name: Miraval 5411 Magic White KU28, particle size 20 to 200 μm) 1.0 part, polycarbonate resin 98.5 parts and 0.5 part of a dispersant were mixed and melt-kneaded at 250 ° C. with an extruder to obtain pellets.
Furthermore, the pellet was molded at 280 to 300 ° C. with an injection molding machine for molding a writing instrument cap (including a clip) to form a cylindrical cap member having a total length of 510 mm and a diameter of 11 mm. A rubber seal was fitted to obtain a writing instrument cap.
The obtained writing instrument cap can be molded without causing cracks and the like, and exhibits a good gloss due to the uniformly dispersed glitter pigment.

Example 2
Bright pigment (Coated by Merck, trade name: Miraval 5420 Magic Gold, particle diameter 20-200 μm) 0.5 parts, orange pigment 1 obtained by coating the surface of a flat glass piece with silicon dioxide and further coating with titanium dioxide 0.0 part, 98.0 parts of PP homopolymer resin and 0.5 part of a dispersant were mixed and melt-kneaded at 220 ° C. with an extruder to obtain colored pellets.
Further, the pellet was molded at 220 ° C. with an injection molding machine for molding a writing instrument cap body to obtain a cap member having a total length of 520 mm and a diameter of 12 mm. Got.
The obtained writing instrument cap can be molded without causing cracks and the like, and exhibits a good gloss due to the uniformly dispersed glitter pigment.

Example 3
A bright pigment formed by coating the surface of a flat glass piece with silicon dioxide and further coated with titanium dioxide (Merck, trade name: Miraval 5423 Magic Lilac, particle size 20-200 μm) 1.0 part, polycarbonate resin 98 0.5 part and 0.5 part of a dispersant were mixed and melt-kneaded at 250 ° C. with an extruder to obtain pellets.
Further, the pellet is molded at 280 to 300 ° C. by an injection molding machine for molding a shaft cylinder to form a cylindrical shaft member having a total length of 1110 mm and a diameter of 9 mm. I got a tube.
The obtained writing instrument shaft tube can be molded without causing cracks and the like, and exhibits a good gloss due to the uniformly dispersed glitter pigment.

Comparative Example 1
A glass flake pigment obtained by coating the surface of a flat glass piece with titanium oxide (manufactured by Nippon Sheet Glass Co., Ltd., trade name: Metashine RCFSX-5090RC) 1.0 part, polycarbonate resin 98.5 parts and a dispersant 0.5 part The mixture was mixed and melt-kneaded at 250 ° C. with an extruder to form pellets.
Furthermore, the pellet was molded at 280 to 300 ° C. with an injection molding machine for molding a writing instrument cap (including a clip) to form a cylindrical cap member having a total length of 510 mm and a diameter of 11 mm. A rubber seal was fitted to obtain a writing instrument cap.
In the obtained writing instrument cap, the glass flake pigment was unevenly distributed in the resin, and it was difficult to obtain uniform glitter.

Claims (3)

  A glitter writing instrument member formed by molding a resin composition in which a surface of a flat glass piece is coated with silicon dioxide and a glitter pigment coated with titanium dioxide is blended in a thermoplastic resin.   The glitter writing instrument member according to claim 1, wherein the glitter pigment has a thickness of 1 μm or less and an average particle diameter of 10 to 200 μm.   The glitter writing instrument member according to claim 1 or 2, wherein the glitter pigment is blended in an amount of 0.01 to 5.0% by weight based on the total amount of the resin composition.