JP2007332478A - Thermochromic fiber-blended paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide thermochromic fiber-blended paper which does not drop thermochromic fibers or thermochromic agent by abrasion, bending or the like, when the paper is made or used. <P>SOLUTION: In the thermochromic fiber-blended paper, the fibers contains 5 to 95 mass% of thermochromic fibers kneaded with a thermochromic agent and 95 to 5 mass% of other fibers essentially consisting of pulp fibers. The thermochromic fiber-blended paper obtained by blending the thermochromic fibers kneaded with the thermochromic agent does not drop the thermochromic agent or the thermochromic fibers by abrasions or the like, and when thermally fusible fibers or hot water-soluble fibers are blended as synthetic fibers except the thermochromic fibers, a nonwoven fabric like thermochromic fiber-blended paper is obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a temperature-sensitive discolored fiber mixed paper having a decorative effect of discoloring or decoloring according to a temperature change.

  Temperature-sensitive color-changing paper whose surface changes or disappears due to temperature changes is used as a simple temperature sensor because it is easy to handle, but by using it in various stationery items such as fancy paper and notebooks, It is also possible to increase the added value by giving a decorative effect.

Conventionally, there is a temperature-sensitive color paper which is obtained by offset printing or gravure printing of a temperature-sensitive dye formed into an ink on a base material (Patent Document 1). Drops and the effect decreases, and when the paper surface has large irregularities, printing using the thermosensitive dye ink becomes difficult.
Japanese Patent Laid-Open No. 51-17808

In addition, temperature-sensitive color-changing paper (Patent Document 2) in which fibers dyed with a temperature-sensitive dye or fibers impregnated with a temperature-sensitive color-changing material is known is known. Since only the material was applied, there was a problem that the sustainability of the temperature-sensitive discoloration effect was insufficient, for example, pigments dropped off from the fiber surface.
JP-A-2-200900

  An object of the present invention is to provide a temperature-sensitive color-changing fiber mixed paper in which the temperature-sensitive color-changing fiber and the temperature-sensitive color changing agent do not fall off due to rubbing or bending during paper making or use.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that a temperature-sensitive color-changing fiber mixed paper obtained by mixing a temperature-sensitive color-changing fiber made of a resin kneaded with a temperature-sensitive color changing agent is Temperature-sensitive discoloring agent or temperature-sensitive discolored fibers will not fall off due to, etc., and non-woven-like temperature-sensitive discoloration by mixing hot-melt fiber or hot-water melted fiber as a synthetic fiber other than temperature-sensitive discolored fiber The present inventors have found that a fiber mixed paper can be obtained and reached the present invention.

That is, in the first invention, the fiber content is 5 to 95% by mass of a temperature-sensitive color-changing fiber made of a resin kneaded with a temperature-sensitive color-changing agent, and 95 to 5% by mass of other fibers essential to pulp fibers. It is a temperature-sensitive color-changing fiber mixed paper.
A second invention is the temperature-sensitive color-changing fiber mixed paper according to claim 1, wherein the other fibers contain synthetic fibers other than the temperature-sensitive color-changing fibers.
3rd invention is 30-70 mass% of said temperature-sensitive discoloration fibers, 5-25 mass% of pulp fibers, and 45-15 mass% of synthetic fibers other than temperature-sensitive discoloration fibers. This is a mixed paper with temperature-sensitive discoloration fibers.
4th invention is the thermosensitive discoloration fiber mixed paper as described in the ball control term 2 or 3 whose said synthetic fiber is 1 or more types of hot melt fiber or hot water melt fiber,
5th invention is the thermosensitive color-change fiber mixed paper as described in any one of Claims 2-4 whose external appearance is a nonwoven fabric tone.
6th invention is the thermosensitive color-change fiber mixed paper as described in any one of Claims 1-5 whose fiber length of the said temperature-sensitive color change fiber is 1-20 mm.
7th invention is the thermosensitive color-change fiber mixed paper as described in any one of Claims 1-6 whose beating degree of the said pulp is 100-350 ml (CFS).

  According to the present invention, a temperature-sensitive color-changing fiber mixed paper can be obtained in which the temperature-sensitive color-changing fiber and the temperature-sensitive color changing agent do not fall off during paper making or use.

  The temperature-sensitive color-changing fiber used in the temperature-sensitive color-changing fiber mixed paper of the present invention uses a fiber in which the temperature-sensitive color changing agent is kneaded in a resin in order to prevent the temperature-sensitive color changing agent from falling off due to rubbing or bending. The temperature-sensitive color changing fiber that can be used in the present invention is prepared by kneading a temperature-sensitive color changing agent into synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate, polyvinylidene chloride, and vinylidene chloride / vinyl chloride copolymer.

  As the temperature-sensitive color changing agent used in the present invention, one comprising three components of an acid developing composition, an acidic composition and a solvent can be used. Examples of the acid developing composition include 3,3′-dimethoxyfluorane, 3-chloro-6-phenylaminofluorane, 3,3 ′, 3 ″-(p-diethylaminophenyl) phthalide, 3- And diethylamino-6-methyl-7-phenylaminofluorane. In the present invention, these acid developing compositions can be used alone or in combination of two or more.

  Examples of the acidic composition used in the present invention include phenols such as p-phenylphenol, bisphenol A, cresol, chloroglycine, and a phenol resin oligomer, or salts thereof, 5-chlorobenzotriazole, 4-laurylamino. Benzotriazoles such as sulfobenzotriazole, dibenzotriazole, 2-oxybenzotriazole, or salts thereof, organic acids such as benzoic acid, stearic acid, p-toluenesulfonic acid, substituted derivatives thereof, salts thereof, and the like Can be mentioned. In the present invention, these acidic compositions can be used alone or in combination of two or more.

  Examples of the solvent used in the present invention include alcohols such as octyl alcohol and dodecyl alcohol, esters such as lauryl stearate and lanolin, azomethines such as benzylideneaniline, benzylidenestearylamine, and 1,4-bisphenylazomethine, Examples include amides such as acetamide, lauric acid amide, p-toluenesulfamide, salicylic acid amide, and naphthalene.

  The shorter the fiber length of the temperature-sensitive discoloration fiber, the better the dispersibility. However, the shorter the fiber length, the more difficult the fiber is to get entangled with the pulp fiber, and thus the fiber tends to fall off the paper. Therefore, the fiber length of the temperature-sensitive discoloration fiber is preferably 1 to 20 mm, and more preferably 3 to 10 mm. Furthermore, if necessary, a dispersant such as polyacrylamide (PAM) or polyethylene oxide (PEO) can be added in an amount of 0.01 to 3.0% by mass per temperature-sensitive discoloration fiber.

  The pulp fibers used in the present invention include softwood bleached kraft pulp (NBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood bleached kraft pulp (LBKP), hardwood semi-bleached kraft pulp (LSBKP), softwood bleached sulfite pulp ( NBSP), hardwood bleached sulfite pulp (LBSP), mechanical pulp (MP), thermomechanical pulp (TMP) and other wood pulp. In the present invention, these pulps can be used alone or in combination of two or more.

  In the present invention, the beating degree of the pulp fibers to be mixed is preferably 100 to 350 ml (CFS), and more preferably 150 to 250 ml. If the beating degree (CFS) of the pulp fiber is higher than 350 ml, the inter-fiber strength is lowered and the fiber is easily dropped. On the other hand, even if it is made lower than 100 ml, an improvement in inter-fiber strength is not recognized, which is not preferable in terms of economy.

  In addition, synthetic fibers other than temperature-sensitive discoloration fibers can be blended as necessary. By blending synthetic fibers other than temperature-sensitive discoloration fibers in this way, it is possible to obtain a non-woven fabric-like mixed paper with coarse fibers entangled compared to a mixed paper in which fibers not blended with synthetic fibers are closely entangled. By using a non-woven mixed paper, the texture is soft and a high-class feeling can be given. Depending on whether or not the synthetic fiber is blended and the blending amount, a mixed paper having a different texture can be obtained. The synthetic fiber used here can be selected from the same synthetic fibers that can be used in the preparation of the temperature-sensitive discoloration fiber.

  Further, a fibrous binder such as hot melt fiber or hot water melt fiber can be mixed. By blending the fibrous binder, the strength of the blended paper when it is made into a nonwoven fabric is secured. The fiber binder is preferably 15 to 45% by mass of the total fiber, and the pulp fiber is preferably 5 to 25% by mass of the total fiber.

  Examples of the hot water melt fiber used as the fibrous binder include polyvinyl alcohol (PVA) fiber, and examples of the heat melt fiber include polyethylene fiber, polypropylene fiber, and polyester fiber. These fibrous binders may be used singly or in combination of two or more, but it is preferable to use a mixture of hot water melted fiber and hot melted fiber, and mix PVA fiber and hot melted fiber. It is particularly preferable to blend. The compounding material of the PVA fiber in this case is 3 to 10% by mass in the fiber content.

Furthermore, in this invention, inorganic fibers, such as glass fiber, can be mix | blended as needed. What is necessary is just to select suitably as an inorganic fiber used by this invention according to the objectives, such as a dimensional stability improvement, in the range which does not impair the effect of this invention.
In addition, a sizing agent, a paper strength enhancer, a fixing agent, and the like can be added as necessary. The basis weight of the temperature-sensitive color-changing fiber mixed paper of the present invention is not particularly limited and can be adjusted according to the purpose of use.

The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples.
The drop-off test of the temperature-sensitive color change agent in the temperature-sensitive color change fiber mixed paper and the temperature-sensitive color change paper obtained in each Example and Comparative Example was performed according to JIS L0849 (Test method for dye fastness to friction).
The test machine uses a dyeing friction fastness tester (trade name RT-200 manufactured by Daiei Kagaku Seisakusho Co., Ltd.) suitable for the friction tester type II (Gakushin type). In the comparative example, after the printing surface was rubbed back and forth 100 times, the presence or absence of color fading of the friction portion of the paper was evaluated visually.

50 parts by mass of temperature-sensitive discoloration fiber (fiber diameter: 16 denier x fiber length: 3 mm, trade name Saran Art TCS2055 manufactured by Asahi Kasei Life & Living Co., Ltd.), and polyethylene oxide (manufactured by Nippon Steel Chemical Co., Ltd.) as a dispersant 0.1 parts by mass of an aqueous solution prepared by adjusting the name PEO15) to 0.1% by mass was dispersed in water, and 50 parts by mass of softwood bleached kraft pulp having a beating degree of 250 ml (CSF) was mixed and stirred. Next, the sizing agent is 1.0% by mass with respect to the pulp solid content, the polyacrylamide as the paper strength enhancer is 0.3% by mass with respect to the pulp solid content, and the sulfuric acid band is 3.0% with respect to the pulp solid content as the fixing agent. Mass% was added to make a slurry. The resulting slurry is made with a long paper machine, coated with a 5.0% by weight oxidized starch solution using a size press roll in the drying step, and a temperature-sensitive discolored fiber mixed paper having a rice basis weight of 80 g / m ^2. Got.

The resulting temperature-sensitive discolored fiber mixed paper is similar to the color kraft paper, light brown at 20 ° C, but turns orange when placed in an oven at 40 ° C and returns to light brown when removed from the oven. .
In addition, as a result of the test for removing the temperature-sensitive color changing agent, no color fading of the paper was observed.

  Temperature-sensitive discoloration fiber (fiber diameter 15 denier x fiber length 5 mm, trade name Saran Art TCS2051 manufactured by Asahi Kasei Life & Living Co., Ltd.) 60 parts by weight, softwood bleached kraft pulp with a beating degree of 200 ml (CSF), 15 parts by weight, heat melting 20 parts by mass of polyester fiber (fiber diameter 2.2 denier x fiber length 5 mm, product name N720 manufactured by Kuraray Co., Ltd.) as the fiber, PVA fiber (fiber diameter 1.1 denier x fiber length 3 mm, Kuraray) as the hot water melted fiber 5 parts by mass of a product name VPB107 manufactured by Co., Ltd. was dispersed in water. Further, 0.2 parts by mass of polyethylene oxide (trade name PEO15 manufactured by Nippon Steel Chemical Co., Ltd.) was added as a dispersant and stirred to disperse the fiber component to obtain a slurry. The resulting slurry was made with an inclined wire paper machine and dried at 125 ° C. using a Yankee dryer to obtain a temperature-sensitive discolored fiber mixed paper.

  The obtained temperature-sensitive color-changing fiber mixed paper was non-woven and green at 20 ° C., but turned yellow when placed in an oven at 40 ° C. and returned to green when removed from the oven. In addition, as a result of the test for removing the temperature-sensitive color changing agent, no color fading of the paper was observed.

[Comparative Example 1]
Temperature-sensitive color-changing ink (Temperature Type 20, Pink, Trade name ST Color ATA, manufactured by Kuboi Ink Co., Ltd.) on the surface of colored kraft paper (trade name Cony Wrap White 85, manufactured by Lintec Corporation) (Standard color developing machine type III, manufactured by Kumagai Riki Kogyo Co., Ltd.) was applied to a coating amount of 1.2 g / m ² and naturally dried in an atmosphere of 25 ° C. and 50% RH for 24 hours. A temperature-sensitive discolored paper was obtained.
The obtained temperature-sensitive color changing paper was a single-sided printing type, and the printing surface at 20 ° C. was pink, but when it was placed in an oven at 40 ° C., it was decolored, and when it was removed from the oven, it returned to pink. .
As a result of the drop-off test of the temperature-sensitive color changing agent of the obtained temperature-sensitive color changing paper, the color of the paper was observed to be discolored.

The temperature-sensitive color-changing fiber mixed paper of the present invention can be used for various stationery items such as fancy paper and notebooks, thereby giving a decorative effect to the product and increasing the added value.

Claims (7)

  The fiber content is 5 to 95% by mass of a temperature-sensitive color-changing fiber composed of a resin kneaded with a temperature-sensitive color-changing agent, and 95 to 5% by mass of other fibers essential to pulp fibers, Temperature sensitive discolored fiber mixed paper.   The temperature-sensitive color-changing fiber mixed paper according to claim 1, wherein the other fibers contain synthetic fibers other than the temperature-sensitive color-changing fibers.   The temperature-sensitive color-changing fiber mixture according to claim 2, comprising 30 to 70% by mass of the temperature-sensitive color-changing fiber, 5 to 25% by mass of pulp fiber, and 45 to 15% by mass of synthetic fiber other than the temperature-sensitive color-changing fiber. Paper making.   The temperature-sensitive color-changing fiber mixed paper according to claim 2 or 3, wherein the synthetic fiber is at least one kind of hot-melt fiber or hot-water melt fiber.   The temperature-sensitive color-changing fiber mixed paper according to any one of claims 2 to 4, wherein the appearance is a nonwoven fabric tone.   The temperature-sensitive color-changing fiber mixed paper according to any one of claims 1 to 5, wherein the fiber length of the temperature-sensitive color-changing fiber is 1 to 20 mm. The temperature-sensitive color-changing fiber mixed paper according to any one of claims 1 to 6, wherein the beating degree of the pulp is 100 to 350 ml (CFS).