JP6027424B2 - Solid cursive - Google Patents

Description

  The present invention relates to a solid cursive body. More specifically, the present invention relates to a solid cursive body capable of forming a handwriting having reversible thermochromic properties.

  Conventionally, solid cursives using reversible thermochromic compositions capable of storing and holding the state before and after color change in a constant temperature range such as a normal temperature range have been proposed (for example, Patent Documents 1 to 3).

  The solid cursive forms a handwriting that changes color due to temperature change by using a reversible thermochromic composition alone or a microcapsule encapsulant as a colorant to be added to a wax as a shaping material. In particular, when a microcapsule pigment encapsulating a heat-decolorable reversible thermochromic composition is used, the handwriting can be easily erased by frictional heat, making it a highly convenient handwriting that can be corrected in error. For example, it can be used for writing in a notebook or notebook, drawing, or the like. However, in the solid cursive material, depending on the material used for the shaping material, the discoloration temperature region inherent to the reversible thermochromic composition may change, or the discoloration itself may be affected. There was a problem. In addition, when there is sufficient strength as a cursive, there is a problem as a solid cursive, such as the handwriting concentration of the solid cursive becomes thin, or when the handwriting concentration is sufficient, the strength of the solid cursive decreases. there were.

Japanese Utility Model Publication No. 7-6248 JP 2008-291048 A JP 2009-166310 A

Kondo Yasuo and Koishi Masumi, "Microcapsules-Manufacturing Method, Properties and Applications-" Sankyo Publishing Co., Ltd. 1977

  The present invention provides a solid handwriting that has a high handwriting density and a sufficient strength without affecting the discoloration characteristics of the handwriting.

In the present invention, at least (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) the electron transfer reaction by the components (a) and (b) is reversible in a specific temperature range. Of a solid cursive material comprising a reversible thermochromic microcapsule pigment (hereinafter sometimes referred to as microcapsule pigment) encapsulating a temperature-sensitive color-changing color memory composition comprising a reaction medium generated in By using a specific wax for the material, the above problems have been solved and the present invention has been completed.
That is, the present invention
“1. The electron transfer reaction by at least (a) an electron donating color-forming organic compound, (b) an electron accepting compound, and (c) the components (a) and (b) above is reversibly performed in a specific temperature range. In a solid writing material containing a reversible thermochromic microcapsule pigment and a shaping material encapsulating a temperature-sensitive color-changing color memory composition comprising a reaction medium to be generated, a styrene-modified polyolefin wax is used as the shaping material. Characteristic solid cursive.
2. 2. The solid cursive according to item 1, wherein a polyolefin wax is further used as the shaping material.
3. 3. The solid writing material according to item 1 or 2, wherein sucrose fatty acid ester or dextrin fatty acid ester is further used as the shaping material. ".

  According to the present invention, by using a styrene-modified polyolefin wax as a shaping material for a solid cursive material, the handwriting density is reduced without affecting the discoloration characteristics when writing on the writing surface using the solid cursive material. improves. Further, the strength of the solid cursive body is improved, and excellent effects such as improved resistance to bending during transportation and impact resistance against bending and writing pressure during writing are exhibited.

It is explanatory drawing which shows the discoloration behavior of the handwriting of the solid cursive body of this invention.

  The solid cursive of the present invention contains a reversible thermochromic microcapsule pigment containing a thermosensitive color-changing color memory composition comprising at least components (a), (b), and (c), and a shaping material. It is characteristic that a styrene-modified polyolefin wax is used as a shape material.

  The solid cursive of the present invention can alternately exhibit the first coloring state and the second coloring state. According to the present invention, the first color development state and the second color development state are expressed in a two-colored state, that is, two color development states of colored (1) and colored (2), a colored state and a decolored state, or a decolored state. This means that the state and the coloring state are interchangeably exhibited. That is, when the temperature rises from the first color development state and changes to the second color development state, the color (1) changes to the color (2), the color development state changes to the color erasure state, that is, the heat disappears. Includes color type changes.

The discoloration behavior of handwriting when writing with the solid cursive of the present invention will be described with reference to FIG. In FIG. 1, the vertical axis represents color density and the horizontal axis represents temperature. The change in color density due to the temperature change proceeds along the arrow. Here, A is a point indicating a density at a temperature t ₄ (hereinafter, also referred to as a complete decoloring temperature) that reaches a completely decolored state, and B is a temperature t ₃ (hereinafter, decolorized) at which decolorization is started. C is a point indicating a density at a temperature t _{2 at} which color development is started (hereinafter sometimes referred to as a color development start temperature), and D is a complete color development state. temperature t ₁ to reach a point showing the density at _{(hereinafter,} sometimes referred to complete coloring temperature). Discoloration temperature region is a temperature range between the t ₁ and t _4, both states of the colored state and the decolored state can coexist, a complete decolored state and a fully-colored state at a temperature range of between t ₂ and t ₃ The temperature range can be selectively exhibited. Further, the length of the line segment EF is a scale indicating the rate of discoloration, and the length of the line segment HG passing through the midpoint of the line segment EF indicates the degree of hysteresis (hereinafter sometimes referred to as ΔH). It is. In the present invention, by having this ΔH value, a hysteresis characteristic in which the first color development state and the second color development state are selectively maintained in a certain temperature range is exhibited.

  In the solid cursive of the present invention, it is presumed that the strength is increased without affecting the discoloration characteristics due to the following mechanism. That is, the color-changing characteristics are based on a temperature-sensitive color-changing color memory composition encapsulated in a reversible thermochromic microcapsule pigment. The microcapsule pigment is provided with separability by the microcapsule wall film so that it does not easily interact with various compounding materials in the solid cursive material, but contains a lot of polar substances as a material blended in the solid cursive material. If this is done, the isolation of the microcapsule wall membrane will be reduced, and the encapsulated thermochromic color memory composition and the material blended in the solid cursive material will penetrate into and out of the microcapsule. Interactions such as the loss of balance and the electron-donating color-forming organic compound causing a color reaction with the electron-accepting compound in various compounding materials become too strong. The so-called discoloration performance tends to deteriorate. Specifically, polar substances such as alcohols, ketones and esters, but when styrene-modified polyolefin wax is included, the interaction between the microcapsules and the polar substance is alleviated, and the thermosensitive color-changing color memory composition. This is considered to have no effect on the discoloration performance. Furthermore, when styrene-modified polyolefin wax is used, the bonding force increases because the shaping material forms a strong network due to the π-π interaction between the aromatic rings introduced by the modification, and the strength of the solid cursive is also increased. It is thought to improve at the same time.

  The solid cursive of the present invention uses a shaping material, and a styrene-modified polyolefin wax is used as the shaping material. Specific examples of the styrene-modified polyolefin wax include SPW series manufactured by Starlight PMC Co., Ltd.

  Furthermore, as a shaping material, for example, wax, gelling agent, clay and the like can be used in combination. Any wax may be used as long as it is conventionally known. Specifically, carnauba wax, wax, beeswax, microcrystalline wax, montan wax, candelilla wax, sucrose fatty acid ester, dextrin fatty acid ester. , Polyolefin wax, paraffin wax and the like. As the gelling agent, conventionally known ones can be used, and examples thereof include 12 hydroxystearic acid, dibenzylidene sorbitols, tribenzylidene sorbitols, amino acid oils, and higher fatty acid alkali metal salts. Examples of clay minerals include kaolin, bentonite, and montmorillonite. When other shaping materials are used in combination with the styrene-modified polyolefin wax, it is preferable to use a polyolefin wax. Specific examples include waxes such as polyethylene, polypropylene, polybutylene, α-olefin polymer, ethylene-propylene copolymer, and ethylene-butene copolymer.

  In particular, those having a softening point of the polyolefin wax in the range of 100 ° C. to 130 ° C. and a penetration of 10 or less are preferably used because of high writing feeling. If the penetration exceeds 10, the solid cursive will tend to be too soft and difficult to write, and the handwriting will be stretched on the paper surface during rubbing and erasing (wax will be thinned). This will contaminate the blank area of the surface and cause color transfer and smudge to other paper.

  In addition, the measuring method of the softening point and the penetration of the polyolefin wax is standardized in JIS K2207, and the penetration value represents 0.1 mm as penetration. Therefore, it is a solid cursive letter that is harder as the number is smaller and softer as the number is larger.

  Specifically, Neo Wax Series (polyethylene manufactured by Yashara Chemical Co., Ltd.), Sun Wax Series (polyethylene manufactured by Sanyo Chemical Industries, Ltd.), High Wax Series (polyolefin manufactured by Mitsui Chemicals, Inc.), AC polyethylene (Honeywell) Polyethylene).

  The solid cursive of the present invention may further contain at least one sucrose fatty acid ester or dextrin fatty acid ester. By using these together, it is possible to improve the handwriting density while maintaining the strength of the solid cursive body sufficiently.

  When a low-polarity styrene-modified polyolefin wax is used in combination with a high-polarity sucrose fatty acid ester or dextrin fatty acid ester, it is considered that microscopic phase separation occurs due to the affinity of the mixed wax. Since the strength improvement effect of the styrene-modified polyolefin wax is obtained and the disintegration property due to microphase separation is also imparted, it is presumed that the amount of wear as a solid handwriting tends to increase, and as a result, the handwriting density is improved.

As the sucrose fatty acid ester, an ester having a C _{12 to} C ₂₂ fatty acid as a constituent fatty acid is particularly preferable, and palmitic acid and stearic acid are more preferable. Specifically, Mitsubishi Chemical Foods Co., Ltd .: Ryoto Sugar Ester Series, Daiichi Kogyo Seiyaku Co., Ltd .: Sugar Wax Series and the like can be mentioned.

The dextrin fatty acid ester used in the solid cursive of the present invention is particularly preferably an ester having a C _{14 to} C ₁₈ fatty acid as a constituent fatty acid, more preferably palmitic acid, myristic acid, or stearic acid. is there. Specifically, Chiba Flour Milling Co., Ltd .: Leopard series, etc. are mentioned.

  The blending ratio of the sucrose fatty acid ester or dextrin fatty acid ester is preferably 30 to 300% by mass with respect to the styrene-modified polyolefin wax. If it is smaller than this range, the color density tends to be lowered, and if it is larger than this range, the color-changing performance of the solid cursive as described above tends to deteriorate. Preferably, it is 50-250 mass%, and when it exists in this range, the discoloration performance and handwriting density | concentration of a solid cursive body can be made compatible.

  The blending ratio of the shaping material used in the solid cursive of the present invention is preferably 0.2 to 70% by mass with respect to the total mass of the solid cursive. If it is smaller than this range, it tends to be difficult to obtain a shape as a solid cursive body, and if it is larger than this range, it tends to be difficult to obtain a sufficient writing density. Preferably, it is 0.5 to 40% by mass, and when it is in this range, the shape of the solid cursive body and the handwriting concentration can be compatible.

  As the component (A) included in the microcapsule pigment used in the solid writing material of the present invention, a so-called leuco dye that is usually used in a heat-sensitive material such as heat-sensitive paper can be used. Specific examples include diphenylmethane phthalides, indolyl phthalides, diphenyl methane azaphthalides, phenyl indolyl azaphthalides, fluorans, styrinoquinolines, diazarhodamine lactones, and the like.

  More specifically, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) ) Phthalide, 3,3-bis (1-n-butyl-2-methylindol-3-yl) phthalide, 3,3-bis (2-ethoxy-4-diethylaminophenyl) -4-azaphthalide, 3- [2 -Ethoxy-4- (N-ethylanilino) phenyl] -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3,6-diphenylaminofluorane, 3,6-dimethoxyfluorane 3,6-di-n-butoxyfluorane, 2-methyl-6- (N-ethyl-Np-tolylamino) fluorane, 3-chloro-6-cyclohexylaminofluor Lan, 2-methyl-6-cyclohexylaminofluorane, 2- (2-chloroanilino) -6-di-n-butylaminofluorane, 2- (3-trifluoromethylanilino) -6-diethylaminofluorane, 2- (N-methylanilino) -6- (N-ethyl-Np-tolylamino) fluorane, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-diethylaminofluorane, 2 -Anilino-3-methyl-6-diethylaminofluorane, 2-anilino-3-methyl-6-di-n-butylaminofluorane, 2-xylidino-3-methyl-6-diethylaminofluorane, 1,2- Benz-6-diethylaminofluorane, 1,2-benz-6- (N-ethyl-N-isobutylamino) fluorane, 1, -Benz-6- (N-ethyl-N-isoamylamino) fluorane, 2- (3-methoxy-4-dodecoxystyryl) quinoline, spiro [5H- (1) benzopyrano (2,3-d) pyrimidine- 5,1 ′ (3′H) isobenzofuran] -3′-one, 2- (diethylamino) -8- (diethylamino) -4-methyl-spiro [5H- (1) benzopyrano (2,3-g) pyrimidine -5,1 '(3'H) isobenzofuran] -3-one, 2- (di-n-butylamino) -8- (di-n-butylamino) -4-methyl-spiro [5H- (1 ) Benzopyrano (2,3-g) pyrimidine-5,1 '(3'H) isobenzofuran] -3-one, 2- (di-n-butylamino) -8- (diethylamino) -4-methyl-spiro [5H- (1) benzopyrano (2,3-g) pyrimidine-5,1 '(3'H) isobenzofuran] -3-one, 2- (di-n-butylamino) -8- (N-ethyl-Ni-amylamino) -4-methyl-spiro [5H- (1) benzopyrano (2,3-g) pyrimidin-5,1 '(3'H) isobenzofuran] -3-one, 3- (2-methoxy-4-dimethylamino Phenyl) -3- (1-butyl-2-methylindol-3-yl) -4,5,6,7-tetrachlorophthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1 -Ethyl-2-methylindol-3-yl) -4,5,6,7-tetrachlorophthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-pentyl-2-methylindole -3-yl) -4,5,6,7-te Lachlorophthalide, 3 ', 6'-bis [phenyl (2-methylphenyl) amino] -spiro [isobenzofuran-1 (3H), 9'-[9H] xanthen] -3-one, 3 ', 6'-bis [Phenyl (3-methylphenyl) amino] -spiro [isobenzofuran-1 (3H), 9 '-[9H] xanthen] -3-one, 3', 6'-bis [phenyl (3-ethylphenyl) amino ] -Spiro [isobenzofuran-1 (3H), 9 '-[9H] xanthen] -3-one.

  Furthermore, there can be mentioned pyridine-based, quinazoline-based, bisquinazoline-based compounds and the like that are effective in developing fluorescent yellow to red color development.

  The electron-accepting compounds of the component (b) included in the microcapsule pigment used in the solid cursive of the present invention include compounds having active protons, pseudo-acidic compounds (not acids, but acting as acids in the composition) And a group of compounds having electron vacancies, and the like. Examples of compounds having active protons include monophenols to polyphenols as compounds having phenolic hydroxyl groups, and alkyl groups, aryl groups, acyl groups, alkoxycarbonyl groups, carboxy groups and esters thereof as substituents. Or what has an amide group, a halogen group, etc., a phenol-aldehyde condensation resin etc., such as a bis type and a tris type phenol, are mentioned. Moreover, the metal salt of the compound which has the said phenolic hydroxyl group can also be used.

  More specifically, phenol, o-cresol, tertiary butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, p- N-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, dodecyl gallate, 2,2-bis (4-hydroxyphenyl) propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4 -Hydroxyphenyl) ethane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane, , 1-Bis (4-hydroxyphenyl) -3-methylbutane, 1,1-bis (4-hydroxyphenyl) -2-methylpropane, 1,1-bis (4-hydroxyphenyl) n-hexane, 1,1-bis (4-hydroxyphenyl) n- Heptane, 1,1-bis (4-hydroxyphenyl) n-octane, 1,1-bis (4-hydroxyphenyl) n-nonane, 1,1-bis (4-hydroxyphenyl) n-decane, 1,1 -Bis (4-hydroxyphenyl) n-dodecane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) ethylpropionate, 2,2-bis (4-hydroxy) Phenyl) -4-methylpentane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,2-bis (4-hydroxyphenyl) n-hepta , 2,2-bis (4-hydroxyphenyl) such as n- nonane, and the like.

  In addition, the compound having a phenolic hydroxyl group can exhibit the most effective thermochromic property, but aromatic carboxylic acid and aliphatic carboxylic acid having 2 to 5 carbon atoms, carboxylic acid metal salt, acidic phosphate ester and A compound selected from those metal salts, 1,2,3-triazole and derivatives thereof can also be used.

  Further, as an electron-accepting compound, a specific alkoxyphenol compound having a linear or side chain alkyl group having 3 to 18 carbon atoms (Japanese Patent Laid-Open No. 11-129623), a specific hydroxybenzoic acid ester (Japanese Patent Laid-Open No. 2001-105732). Gazette), gallic acid esters (Japanese Patent Laid-Open No. 2003-253149), and the like, and a heat coloring type reversible thermochromic composition can also be applied.

  As the component (c) of the reaction medium for reversibly causing the electron transfer reaction by the components (a) and (b) contained in the microcapsule pigment used in the solid cursive material of the present invention in a specific temperature range, the solid cursive material is used. It is necessary that the crystallinity in the range be in the range of 16-100. Specific examples include alcohols, esters, ketones, and ethers.

  The component (c) is preferably a large hysteresis characteristic regarding the color density-temperature curve (a curve plotting a change in color density due to a temperature change changes the temperature from the low temperature side to the high temperature side and the high temperature side to the low temperature side). A carboxylic acid ester compound that exhibits a ΔT value (melting point-cloud point) of 5 ° C. or higher and lower than 50 ° C., which can form a reversible thermochromic composition that exhibits color memory, and changes color when changing to the side) For example, a carboxylic acid ester having a substituted aromatic ring in the molecule, an ester of a carboxylic acid having an unsubstituted aromatic ring and an aliphatic alcohol having 10 or more carbon atoms, a carboxylic acid ester having a cyclohexyl group in the molecule, 6 carbon atoms Fatty acid and unsubstituted aromatic alcohol or phenol ester, fatty acid having 8 or more carbon atoms and branched aliphatic alcohol or ester, dicarboxylic acid And esters of aromatic alcohol or branched aliphatic alcohol, dibenzyl cinnamate, heptyl stearate, didecyl adipate, dilauryl adipate, dimyristyl adipate, dicetyl adipate, distearyl adipate, trilaurin, trimyristin, tristearin, Dimyristin, distearin and the like can be used.

  Also, fatty acid ester compounds obtained from an odd aliphatic monohydric alcohol having 9 or more carbon atoms and an aliphatic carboxylic acid having an even number of carbon atoms, n-pentyl alcohol or n-heptyl alcohol, and an even number of fats having 10 to 16 carbon atoms. A fatty acid ester compound having a total carbon number of 17 to 23 obtained from a group carboxylic acid may be used.

  Specifically, as esters, n-pentadecyl acetate, n-tridecyl butyrate, n-pentadecyl butyrate, n-undecyl caproate, n-tridecyl caproate, n-pentadecyl caproate, n-nonyl caprylate, capryl N-undecyl acid, n-tridecyl caprylate, n-pentadecyl caprylate, n-heptyl caprate, n-nonyl caprate, n-undecyl caprate, n-tridecyl caprate, n-pentadecyl caprate, n-laurate -Pentyl, n-heptyl laurate, n-nonyl laurate, n-undecyl laurate, n-tridecyl laurate, n-pentadecyl laurate, n-pentyl myristate, n-heptyl myristate, n-nonyl myristate , N-undecyl myristate, myristic N-tridecyl acid, n-pentadecyl myristate, n-pentyl palmitate, n-heptyl palmitate, n-nonyl palmitate, n-undecyl palmitate, n-tridecyl palmitate, n-pentadecyl palmitate, n stearate Nonyl, n-undecyl stearate, n-tridecyl stearate, n-pentadecyl stearate, n-nonyl eicosanoate, n-undecyl eicosanoate, n-tridecyl eicosanoate, n-pentadecyl eicosanoate, n-nonyl behenate , N-undecyl behenate, n-tridecyl behenate, n-pentadecyl behenate and the like.

  As the ketones, aliphatic ketones having a total carbon number of 10 or more are effective, and 2-decanone, 3-decanone, 4-decanone, 2-undecanone, 3-undecanone, 4-undecanone, and 5-undecanone. 2-dodecanone, 3-dodecanone, 4-dodecanone, 5-dodecanone, 2-tridecanone, 3-tridecanone, 2-tetradecanone, 2-pentadecanone, 8-pentadecanone, 2-hexadecanone, 3-hexadecanone, 9-heptadecanone, 2 -Pentadecanone, 2-octadecanone, 2-nonadecanone, 10-nonadecanone, 2-eicosanone, 11-eicosanone, 2-heneicosanone, 2-docosanone, laurone, stearone and the like.

  Furthermore, as arylalkyl ketones having 12 to 24 carbon atoms, for example, n-octadecanophenone, n-heptadecanophenone, n-hexadecanophenone, n-pentadecanophenone, n-tetra Decanophenone, 4-n-dodecanacetophenone, n-tridecanophenone, 4-n-undecanoacetophenone, n-laurophenone, 4-n-decanoacetophenone, n-undecanophenone, 4-n-nonylacetophenone N-decanophenone, 4-n-octylacetophenone, n-nonanophenone, 4-n-heptylacetophenone, n-octanophenone, 4-n-hexylacetophenone, 4-n-cyclohexylacetophenone, 4-tert-butylpropio Phenone, n-heptaphenone, 4-n-pentyl Acetophenone, phenyl ketone, benzyl -n- butyl ketone, 4-n-butyl acetophenone, n- hexanophenone, 4-isobutyl acetophenone, 1-acetonaphthone, 2-acetonaphthone, like cyclopentyl phenyl ketone.

  As ethers, aliphatic ethers having a total carbon number of 10 or more are effective, and dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, dinonyl ether, didecyl ether, diundecyl ether, didodecyl ether. , Ditridecyl ether, ditetradecyl ether, dipentadecyl ether, dihexadecyl ether, dioctadecyl ether, decane diol dimethyl ether, undecane diol dimethyl ether, dodecane diol dimethyl ether, tridecane diol dimethyl ether, decane diol diethyl ether, undecane diol diethyl ether Etc.

（式中、Ｒ１は水素原子又はメチル基を示し、ｍは０〜２の整数を示し、Ｘ１、Ｘ２のいずれか一方は−（ＣＨ２）ｎＯＣＯＲ２又は−（ＣＨ２）ｎＣＯＯＲ２、他方は水素原子を示し、ｎは０〜２の整数を示し、Ｒ２は炭素数４以上のアルキル基又はアルケニル基を示し、Ｙ１及びＹ２は水素原子、炭素数１〜４のアルキル基、メトキシ基、又は、ハロゲンを示し、ｒ及びｐは１〜３の整数を示す。） Furthermore, a compound represented by the following general formula (1) is preferably used as the component (c).

(In the formula, R1 represents a hydrogen atom or a methyl group, m represents an integer of 0 to 2, one of X1 and X2 represents — (CH2) nOCOR2 or — (CH2) nCOOR2, and the other represents a hydrogen atom. , N represents an integer of 0 to 2, R2 represents an alkyl group or alkenyl group having 4 or more carbon atoms, Y1 and Y2 represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, or a halogen. , R and p represent an integer of 1 to 3)

  Of the compounds represented by (Chemical Formula 1), when R1 is a hydrogen atom, a reversible thermochromic composition having a wider hysteresis width can be obtained, and R1 is a hydrogen atom, and m It is more preferable that is 0.

（式中のＲは炭素数８以上のアルキル基又はアルケニル基を示すが、好ましくは炭素数１０〜２４のアルキル基、更に好ましくは炭素数１２〜２２のアルキル基である。） Of the compounds represented by (Chemical Formula 1), compounds represented by the following general formula (Chemical Formula 2) are more preferably used.

(In the formula, R represents an alkyl group or alkenyl group having 8 or more carbon atoms, preferably an alkyl group having 10 to 24 carbon atoms, more preferably an alkyl group having 12 to 22 carbon atoms.)

  Specific examples of the compound include octanoic acid-4-benzyloxyphenylethyl, nonanoic acid-4-benzyloxyphenylethyl, decanoic acid-4-benzyloxyphenylethyl, undecanoic acid-4-benzyloxyphenylethyl, and dodecanoic acid. -4-benzyloxyphenylethyl, tridecanoic acid-4-benzyloxyphenylethyl, tetradecanoic acid-4-benzyloxyphenylethyl, pentadecanoic acid-4-benzyloxyphenylethyl, hexadecanoic acid-4-benzyloxyphenylethyl, heptadecanoic acid Examples thereof include -4-benzyloxyphenylethyl and octadecanoic acid-4-benzyloxyphenylethyl.

（式中、Ｒは炭素数８以上のアルキル基又はアルケニル基を示し、ｍ及びｎはそれぞれ１〜３の整数を示し、Ｘ及びＹはそれぞれ水素原子、炭素数１〜４のアルキル基、炭素数１〜４のアルコキシ基、ハロゲンを示す。） Furthermore, as the component (c), a compound represented by the following general formula (Formula 3) can also be used.

(In the formula, R represents an alkyl group or alkenyl group having 8 or more carbon atoms, m and n each represents an integer of 1 to 3, X and Y represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, carbon, respectively. (The alkoxy group of Formula 1-4 is shown, and a halogen.)

  Specific examples of the compound include 1,1-diphenylmethyl octanoate, 1,1-diphenylmethyl nonanoate, 1,1-diphenylmethyl decanoate, 1,1-diphenylmethyl undecanoate, 1,1-dodecanoic acid 1,1- Diphenylmethyl, tridecanoic acid 1,1-diphenylmethyl, tetradecanoic acid 1,1-diphenylmethyl, pentadecanoic acid 1,1-diphenylmethyl, hexadecanoic acid 1,1-diphenylmethyl, heptadecanoic acid 1,1-diphenylmethyl, octadecanoic acid Examples thereof include 1,1-diphenylmethyl.

（式中、Ｘは水素原子、炭素数１乃至４のアルキル基、メトキシ基、ハロゲン原子のいずれかを示し、ｍは１乃至３の整数を示し、ｎは１乃至２０の整数を示す。） Furthermore, a compound represented by the following general formula (Formula 4) can also be used as the component (c).

(Wherein, X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, or a halogen atom, m represents an integer of 1 to 3, and n represents an integer of 1 to 20)

  Examples of the compound include a diester of malonic acid and 2- [4- (4-chlorobenzyloxy) phenyl)] ethanol, a diester of succinic acid and 2- (4-benzyloxyphenyl) ethanol, succinic acid and 2- Diester with [4- (3-methylbenzyloxy) phenyl)] ethanol, diester with glutaric acid and 2- (4-benzyloxyphenyl) ethanol, glutaric acid and 2- [4- (4-chlorobenzyloxy) Phenyl)] ethanol diester, adipic acid and 2- (4-benzyloxyphenyl) ethanol diester, pimelic acid and 2- (4-benzyloxyphenyl) ethanol diester, suberic acid and 2- (4- Diester with benzyloxyphenyl) ethanol, suberic acid and 2- [4- (3-methyl Benzyloxy) phenyl)] ethanol diester, suberic acid and 2- [4- (4-chlorobenzyloxy) phenyl)] ethanol diester, suberic acid and 2- [4- (2,4-dichlorobenzyloxy) ) Phenyl)] ethanol diester, azelaic acid and 2- (4-benzyloxyphenyl) ethanol diester, sebacic acid and 2- (4-benzyloxyphenyl) ethanol diester, 1,10-decanedicarboxylic acid And 2- (4-benzyloxyphenyl) ethanol diester, 1,18-octadecanedicarboxylic acid and 2- (4-benzyloxyphenyl) ethanol diester, 1,18-octadecanedicarboxylic acid and 2- [4- (2-Methylbenzyloxy) phenyl)] die with ethanol Etc. can be exemplified ether.

（式中、Ｒは炭素数１乃至２１のアルキル基又はアルケニル基を示し、ｎは１乃至３の整数を示す。） Furthermore, a compound represented by the following general formula (Formula 5) can also be used as the component (c).

(In the formula, R represents an alkyl group or alkenyl group having 1 to 21 carbon atoms, and n represents an integer of 1 to 3).

  Examples of the compound include a diester of 1,3-bis (2-hydroxyethoxy) benzene and capric acid, a diester of 1,3-bis (2-hydroxyethoxy) benzene and undecanoic acid, and 1,3-bis (2 -Hydroxyethoxy) benzene and lauric acid diester, 1,3-bis (2-hydroxyethoxy) benzene and myristic acid diester, 1,4-bis (hydroxymethoxy) benzene and butyric acid diester, 1,4 Diesters of bis (hydroxymethoxy) benzene and isovaleric acid, diesters of 1,4-bis (2-hydroxyethoxy) benzene and acetic acid, and 1,4-bis (2-hydroxyethoxy) benzene and propionic acid Diester, diester of 1,4-bis (2-hydroxyethoxy) benzene and valeric acid Diester of 1,4-bis (2-hydroxyethoxy) benzene and caproic acid, diester of 1,4-bis (2-hydroxyethoxy) benzene and caprylic acid, 1,4-bis (2-hydroxyethoxy) benzene And a diester of 1,4-bis (2-hydroxyethoxy) benzene and lauric acid, a diester of 1,4-bis (2-hydroxyethoxy) benzene and myristic acid, and the like.

（式中、Ｘは水素原子、炭素数１乃至４のアルキル基、炭素数１乃至４のアルコキシ基、ハロゲン原子のいずれかを示し、ｍは１乃至３の整数を示し、ｎは１乃至２０の整数を示す。） Furthermore, a compound represented by the following general formula (6) can also be used as the component (c).

(Wherein, X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a halogen atom, m represents an integer of 1 to 3, and n represents 1 to 20) Indicates an integer.)

  Examples of the compound include a diester of succinic acid and 2-phenoxyethanol, a diester of suberic acid and 2-phenoxyethanol, a diester of sebacic acid and 2-phenoxyethanol, a diester of 1,10-decanedicarboxylic acid and 2-phenoxyethanol, Examples include a diester of 1,18-octadecanedicarboxylic acid and 2-phenoxyethanol.

  The mixing ratio of the three components (A), (B), and (C) included in the microcapsule pigment used in the solid cursive of the present invention is determined by the concentration, the color change temperature, the color change form, and the type of each component. The blending ratio at which desired characteristics are obtained is, in mass ratio, (A) component: (B) component: (C) component = 1: 0.1-50: 1-800, ) Component: (B) Component: (C) Component = 1: 0.5-20: 5-200. Each of these components may be used in combination of two or more.

The microcapsule pigment used in the solid cursive of the present invention has various additives such as antioxidants, ultraviolet absorbers, infrared absorbers, dissolution aids, antiseptic / antifungal agents, etc., as long as the function is not affected. Can be added.
When the first coloring state and the second coloring state change between colored (1) and colored (2), the solid cursive of the present invention contains a non-thermochromic colorant such as a dye or pigment. This can be achieved.

  In the microcapsule pigment used in the present invention, the mass ratio between the inclusion and the wall membrane is preferably inclusion: wall membrane = 1: 1 to 7: 1. If the ratio of inclusions is larger than this range, the thickness of the wall film becomes thinner and weakens against pressure and heat, and the microcapsules tend to be destroyed. Tend to decrease. More preferably, the inclusion: wall membrane = 1: 1 to 6: 1. If it is within this range, the density and visibility in the colored state are high, and the microcapsules are not destroyed.

  The microcapsule pigment used in the solid cursive material of the present invention is not particularly limited, but the average particle size is preferably 0.1 to 50 μm. If it is smaller than this range, the color density tends to be lowered. If it is larger than this range, the dispersion stability and processability tend to be inferior when used in a solid cursive. More preferably, it is 0.3-30 micrometers. Within this range, the color development state is good, and the dispersion stability and processability are improved.

  The average particle diameter of the microcapsule pigment referred to in the present invention is represented by the value of D50 expressed on a volume basis when the outer diameter of the particle is measured. Here, a laser diffraction / scattering particle size distribution measuring apparatus is used. (Measured using Horiba, Ltd .; LA-300) and the average particle diameter (median diameter) calculated based on the numerical value is used.

  As a compounding ratio of the microcapsule pigment used for the solid cursive of the present invention, 1 to 70% by mass is preferable with respect to the total mass of the solid cursive. If it is smaller than this range, the color density tends to decrease, and if it exceeds this range, the strength of the solid cursive tends to decrease. Preferably, it is 5-50 mass%, More preferably, it is 10-40 mass%. If it exists in this range, the intensity | strength and handwriting density | concentration of a solid cursive body can be made compatible.

  The microcapsule pigment is described in, for example, Non-Patent Document 1 (Takeshi Kondo and Masumi Koishi, “Microcapsules—Production, Properties, and Applications—Sankyo Publishing Co., Ltd., 1977)”. Any generally known method can be used. Specifically, the coacervate method, interfacial polymerization method, interfacial polycondensation method, in-situ polymerization method, submerged drying method, submerged curing method, suspension polymerization method, emulsion polymerization method, air suspension coating method, spray The dry method etc. are mentioned and it selects suitably.

  Various additives can be added to the solid cursive of the present invention as necessary. Examples of the additive include an extender, a viscosity modifier, a fungicide, an antiseptic, an antibacterial agent, an ultraviolet light inhibitor, a light stabilizer, and a fragrance. Examples of the extender include talc, clay, silica, calcium carbonate, barium sulfate, alumina, mica, boron nitride, potassium titanate, glass flakes, and talc and calcium carbonate are particularly preferred from the viewpoint of moldability. Yes. The extender is blended for the purpose of improving the strength and adjusting the writing quality of the solid cursive of the present invention.

  When the first coloring state and the second coloring state change between colored (1) and colored (2), the solid cursive of the present invention contains a non-thermochromic colorant such as a dye or pigment. This can be achieved.

  The solid cursive of the present invention can be written on various writing surfaces. Furthermore, the handwriting can be discolored by rubbing with a finger or application of a heating tool or a cooling tool.

  Examples of the heating tool include an energization heating color changing tool equipped with a resistance heating element, a heating color changing tool filled with hot water, and a hair dryer. Preferably, a friction member is used as a means capable of changing color by a simple method. Used.

  The friction member is preferably an elastic body such as an elastomer or a plastic foam which is rich in elasticity and can generate an appropriate friction during friction to generate frictional heat. As the material of the friction member, silicone resin, SEBS resin (styrene ethylene butadiene styrene block copolymer), polyester resin, or the like can be used. The friction member can be obtained by combining a solid cursive body and a friction body, which is a separate member of arbitrary shape, to obtain a solid cursive set, but the solid cursive body or a solid curly body containing the solid cursive body in an exterior container By providing the friction member on the exterior of the writing instrument, it becomes excellent in portability. Specifically, a form in which the exterior is provided with a friction member in the shape of a pencil, such as wood or paper, or a crayon.

  Examples of the cooling / heating tool include a cooling / heating discoloration tool using a Peltier element, a cooling / heating discoloration tool filled with a refrigerant such as cold water and ice pieces, a cold insulation agent, and application of a refrigerator and a freezer.

(Production of microcapsule pigment A)
(I) 2- (dibutylamino) -8- (dipentylamino) -4-methyl-spiro [5H- [1] benzopyrano [2,3-g] pyrimidine-5,1 '(3'H)- 1.0 part of isobenzofuran] -3-one, 3.0 parts of 4,4 ′-(2-ethylhexane-1,1-diyl) diphenol as component (b), 2,2-bis (4′- Hydroxyphenyl) -hexafluoropropane 5.0 parts and (c) thermosensitive color-changing color memory composition consisting of 50.0 parts by mass of capric acid-4-benzyloxyphenylethyl as a component is dissolved by heating. A solution prepared by mixing 30.0 parts by weight of an aromatic isocyanate prepolymer and 40.0 parts by weight of a co-solvent is emulsified and dispersed in an aqueous 8% polyvinyl alcohol solution, and stirring is continued while heating. Denatured Down 2.5 parts by weight was added and further stirring continued to obtain a thermochromic microcapsule suspension. The suspension was centrifuged to isolate thermochromic microcapsules. The average particle diameter of the microcapsules is 2.3 μm, t ₁ : −20 ° C., t ₂ : −10 ° C., t ₃ : 48 ° C., t ₄ : 58 ° C., ΔH: 68 ° C., temperature-sensitive discoloration. Sex color memory composition: wall film = 2.6: A behavior having a hysteresis characteristic of 1.0 was exhibited, and the color changed reversibly from pink to colorless and from colorless to pink.

(Production of microcapsule pigment B)
(I) 1,2-Benz-6-diethylaminofluorane (1.5 parts) as component (b) 2,2-bis (4′-hydroxyphenyl) -4-methylpentane (5.0 parts) as component (ha) ) A temperature-sensitive color-changing color memory composition composed of 50.0 parts by mass of tridecyl caprate as a component is heated and dissolved, and 10 parts of Epon 828 (epoxy resin manufactured by Yuka Shell Epoxy Co., Ltd.) and 10 parts of methyl ethyl ketone are mixed. After mixing with the solution, it is dropped into 100 parts of a 10% gelatin aqueous solution and stirred to form fine droplets. Separately, a solution prepared by dissolving 5 parts of a curing agent U (manufactured by Yuka Shell Epoxy Co., Ltd., amine adduct of epoxy resin) in 45 parts of water was gradually added to the stirring solution, Stirring was continued for about 5 hours while maintaining the temperature at 80 ° C. to obtain a thermochromic microcapsule suspension. The suspension was centrifuged to isolate thermochromic microcapsules. The microcapsules have an average particle size of 2.6 μm, and have behaviors having hysteresis characteristics of t ₁ : 8 ° C., t ₂ : 13 ° C., t ₃ : 23 ° C., t ₄ : 28 ° C., ΔH: 15 ° C. The color changed reversibly from pink to colorless and from colorless to pink.

Example 1
(Manufacture of solid cursive letters)
Microcapsule pigment A 40 parts by mass Styrene-modified polyolefin wax 20 parts by mass (SPW-7176, manufactured by Seiko PMC Co., Ltd.)
Polyvinyl alcohol 2 parts by mass Hindered amine (TINSFIN 765 manufactured by BASF) 1 part by mass Talc (extrinsic material) 37 parts by mass Then, it was molded to a length of 60 mm to obtain a solid cursive body.

Examples 2-7, Comparative Examples 1-4
With the formulation shown in (Table 1), solid cursives were obtained in the same manner as in Example 1.

Using the solid cursives obtained in Examples 1 to 7 and Comparative Examples 1 to 4, the solid cursives were evaluated for bending strength, discoloration performance, wear amount, and handwriting density by the following methods. The results are shown in (Table 1).
Measurement of bending strength: Measured according to JIS-S6005.

Discoloration performance: An erase mark was created by erasing the handwriting obtained from the solid cursive with a friction eraser. The obtained erasure marks were left at 5 ° C. for 24 hours, and the erasure marks after 24 hours were visually evaluated.
(Double-circle): The recurrence color of the erasure mark was not seen but favorable discoloration performance was obtained.
○: There was almost no recurrence color of the erasure mark, and good discoloration performance was maintained.
Δ: Partially reappearing color in the erasure mark and deterioration in the discoloration performance, but at a level causing no practical problem.
X: The recurrence color of the erase mark was confirmed, and the erase performance was deteriorated.

Abrasion amount: Using a solid cursive body, writing was performed on neutral paper using a drawing machine with a load of 100 g, and the amount of abrasion at that time was measured.
Handwriting density: Writing on neutral paper using a solid cursive body, the handwriting density at that time was evaluated visually.
(Double-circle): A handwriting can be visually recognized and the density | concentration is high enough.
○: The handwriting can be visually recognized, and its density is high.
(Triangle | delta): Although handwriting can be visually recognized, the density | concentration is quite low.
X: Handwriting cannot be visually recognized.

  As is clear from the results shown in (Table 1), the bending strength of the solid cursive of the present invention was larger than that of the solid cursive of the comparative example. Furthermore, there was no problem with the discoloration characteristics, the handwriting density was improved, and it was excellent as a solid cursive. On the other hand, the solid cursives shown in Comparative Examples 1 to 3 were inferior in bending strength, discoloration characteristics, and color density compared with the solid cursives of the present invention. Further, the solid cursive material of Comparative Example 4 had a high color density, but had a problem in the color change characteristics and had a low bending strength. As above-mentioned, the solid cursive of the comparative example was inferior to the solid cursive of the present invention.

  As is clear from the above evaluation results, it is apparent that the solid cursive of the present invention is superior in function as a solid cursive, such as strength, discoloration performance, and color density, as compared with the conventional one.

The solid cursive of the present invention can be used for various writing instruments such as marking pens, pencils, and colored pencils, drawing materials for coloring and drawing, temperature indicating materials such as temperature indicators, and the like.

t ₁ Complete color development temperature of the handwriting of the heat-erasable solid writing material of the present invention t ₂ Color development start temperature of handwriting of the heat-erasable solid writing material of the present invention t ₃ Heat-erasing type solid writing of the present invention Decoloration start temperature t of body handwriting t ₄ Complete decolorization temperature of handwriting of heat decoloring type solid cursive material of the present invention ΔH Temperature range indicating the degree of hysteresis

Claims (3)

  Reaction that causes reversible electron transfer reaction at least in (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) the components (a) and (b) in a specific temperature range. A solid cursive material comprising a reversible thermochromic microcapsule pigment encapsulating a thermochromic color memory composition comprising a medium and a shaping material, wherein a styrene-modified polyolefin wax is used as the shaping material. Solid cursive.   The solid writing material according to claim 1, wherein a polyolefin wax is further used as the shaping material. The solid cursive according to claim 1 or 2, wherein a sucrose fatty acid ester or a dextrin fatty acid ester is further used as the shaping material.

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