WO2013061814A1 - 可逆熱変色性組成物 - Google Patents
可逆熱変色性組成物 Download PDFInfo
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- WO2013061814A1 WO2013061814A1 PCT/JP2012/076613 JP2012076613W WO2013061814A1 WO 2013061814 A1 WO2013061814 A1 WO 2013061814A1 JP 2012076613 W JP2012076613 W JP 2012076613W WO 2013061814 A1 WO2013061814 A1 WO 2013061814A1
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- component
- reversible thermochromic
- writing
- temperature
- color
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
- B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K15/00—Assembling, finishing, or repairing pens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
- B43K19/16—Making non-propelling pencils
- B43K19/18—Making pencil writing-cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
- B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K25/00—Attaching writing implements to wearing apparel or objects involving constructional changes of the implements
- B43K25/02—Clips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K29/00—Combinations of writing implements with other articles
- B43K29/02—Combinations of writing implements with other articles with rubbers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K7/00—Ball-point pens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K8/00—Pens with writing-points other than nibs or balls
- B43K8/02—Pens with writing-points other than nibs or balls with writing-points comprising fibres, felt, or similar porous or capillary material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L19/00—Erasers, rubbers, or erasing devices; Holders therefor
- B43L19/0025—Eraser or rubber material, e.g. comprising hard particles
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/16—Writing inks
- C09D11/17—Writing inks characterised by colouring agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/26—Thermosensitive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
- C09K9/02—Organic tenebrescent materials
Definitions
- the present invention relates to a composition having reversible thermochromic properties. Specifically, it is used as a colorant (coloring material) such as a solid writing body composed of a solid core such as a pencil core or a color core and a writing ink composition used for a ballpoint pen or the like, which forms a handwriting having reversible thermochromic properties.
- a colorant coloring material
- the present invention relates to a reversible thermochromic composition.
- 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 the wax as a shaping material.
- a reversible thermochromic composition alone or a microcapsule encapsulant as a colorant to be added to the wax as a shaping material.
- the handwriting can be easily erased by frictional heat, making it a highly convenient handwriting that can be corrected in error.
- the present invention can be applied to writing on a notebook or notebook, drawing, and the like.
- beeswax, wood wax, paraffin wax and microcrystalline wax are used as the wax, so that a smooth writing feeling can be imparted, but at the time of friction elimination, the handwriting part is slippery and difficult to erase. There was a problem that the afterimage was easily visually recognized at the location where the handwriting was erased.
- thermochromic compositions As described above, solid cursives and writing ink compositions using a reversible thermochromic composition sometimes erased or discolored at sites that were not expected to be erased or discolored.
- the present invention is a reversible thermochromic composition that can be decolored or discolored by heating, and is used in a solid cursive body and a writing ink composition, in a region that is not expected to be decolored or discolored. It is intended to provide something that is less erased or discolored.
- the reversible thermochromic composition according to the present invention comprises: (A1) an electron-donating color-forming organic compound; (A2) an electron-accepting compound; (A3) a reaction medium for reversibly causing an electron transfer reaction by the component (a1) and the component (a2) in a specific temperature range; A reversible thermochromic component (a), and (b) a combination of components for controlling the amount of heat transferred to the reversible thermochromic component.
- the solid cursive according to the present invention is: (A1) an electron-donating color-forming organic compound; (A2) an electron-accepting compound; (A3) A reversible thermochromic micro comprising a reversible thermochromic component (a) comprising a reaction medium that reversibly causes an electron transfer reaction by the components (a1) and (a2) in a specific temperature range.
- Capsule pigments (Bi) an ester compound selected from the group consisting of sucrose fatty acid esters and dextrin fatty acid esters; (C) a polyolefin wax; It is characterized by comprising.
- solid cursives are: (A1) an electron-donating color-forming organic compound; (A2) an electron-accepting compound; (A3) A reversible thermochromic microcapsule pigment including a reversible thermochromic component (a) comprising a reaction medium that reversibly causes an electron transfer reaction by the components (a1) and (a2) in a specific temperature range
- a reversible thermochromic component comprising a reaction medium that reversibly causes an electron transfer reaction by the components (a1) and (a2) in a specific temperature range
- an ester compound selected from the group consisting of sucrose fatty acid esters and dextrin fatty acid esters
- an endothermic phase change compound that is always incompatible with the reversible thermochromic component (a) and has a melting point lower than the melting point of component (a3)
- a polyolefin wax It is characterized by comprising.
- the handwriting is not thinned or decolored by self-heating due to rapid writing, so the handwriting visibility using the reversible thermochromic composition according to the present invention is improved. Furthermore, when the reversible thermochromic composition according to the present invention is used for solid writing, it is possible to provide a solid writing that can be applied to overpainting applications such as coloring that require the formation of shades of colored portions. In addition, when the reversible thermochromic composition according to the present invention is used for an ink composition for writing instruments, useless parts such as letters on the back surface are erased or discolored when erasing handwriting written on a notebook or the like. It has excellent effects such as disappearance.
- thermochromic composition shows the discoloration behavior of the microcapsule pigment which included the heat decoloring type reversible thermochromic composition. It is explanatory drawing which shows the discoloration behavior of the microcapsule pigment which included the heat decoloring type reversible thermochromic composition which has color memory property. It is explanatory drawing which shows the discoloration behavior of the microcapsule pigment which included the heating coloring type reversible thermochromic composition. It is explanatory drawing which shows the discoloration behavior by the endothermic phase change compound in a reversible thermochromic composition.
- the reversible thermochromic composition according to the present invention essentially comprises two components: (a) a reversible thermochromic component and (b) a component that controls the amount of heat transferred to the reversible thermochromic component. It is. These components will be specifically described as follows.
- thermochromic component When such a component (a) is decolored by heating and develops color by cooling, it can be called a heat decoloring type reversible thermochromic component.
- a heat decoloring type reversible thermochromic component Such component (a) is described in JP-B-51-44706, JP-B-51-44707, JP-B-1-29398, and the like.
- the shape of the curve plotting the change in color density due to temperature change differs greatly between when the temperature is raised from the lower temperature side than the color change temperature range and when the temperature is lowered from the higher temperature side than the color change temperature range.
- the color changes following the path, and the color development state in the low temperature range below the complete color development temperature (t 1 ) or the color erase state in the high temperature range above the complete color erase temperature (t 4 ) is a specific temperature range [t 2 to In the temperature range between t 3 (substantially two-phase holding temperature range)], a component having color memory can be used.
- This component may be of a heat decoloring type (decolored by heating and colored by cooling), or may be encapsulated in microcapsules.
- reversible thermochromic components having color memory are described in JP-B-4-17154, JP-A-7-179777, JP-A-7-33997, JP-A-8-39936, and the like. ing. On the contrary, a reversible thermochromic component that develops color by heating can also be used.
- 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.
- A is a point indicating a density at a temperature t 4 (hereinafter referred to as a complete decoloring temperature) reaching a completely decolored state
- B is a temperature t 3 (hereinafter referred to as a decoloring start temperature) at which decoloring starts.
- C is a point indicating a density at a temperature t 2 at which color development starts (hereinafter referred to as a color development start temperature)
- D is a temperature t 1 at which a fully colored state is reached (hereinafter referred to as a color development start temperature).
- a complete color development temperature Referred to as a complete color development temperature).
- the length of the line segment EF is a scale indicating the discoloration contrast
- the length of the line segment HG is a temperature width indicating the degree of hysteresis (hereinafter referred to as hysteresis width ⁇ H). It is easy to maintain each state before and after the color change.
- the difference between t 4 and t 3 , or the difference between t 2 and t 1 ( ⁇ t) is a scale indicating the sensitivity of discoloration.
- the complete decoloring temperature (t 4 ) is 45 to 95 ° C. and the color development start temperature (t 2 ) is ⁇ 50 to 10 ° C.
- the color development state can be maintained in the normal temperature range, and in order to facilitate the discoloration due to the friction of the handwriting, the complete color erasing temperature (t 4 ) is 45 to 95 ° C., and the color development start temperature (t 2 ) is The reason why the temperature is preferably ⁇ 50 to 10 ° C. can be explained as follows.
- the complete color erasing temperature (t 4 ) is normal temperature. If the temperature exceeds 45 ° C above the temperature range, the color development state will be maintained in the normal use state, and if the color development start temperature (t 2 ) is below the normal temperature range, the temperature is in the decolored state. Is maintained in normal use.
- the handwriting formed on the writing surface can be sufficiently discolored by frictional heat due to several times of friction by the friction member. .
- the temperature setting is an important requirement for the solid writing material and the writing ink composition to be selectively viewed by selecting the handwriting in the discolored state on the writing surface and satisfying convenience and practicality. it can.
- a higher temperature is preferable in order to maintain the color development state in a normal use state, and the frictional heat due to friction is a complete color erasure temperature ( In order to exceed t 4 ), a low temperature is preferred.
- the complete decoloring temperature (t 4 ) is preferably 50 to 90 ° C., more preferably 60 to 80 ° C.
- a lower temperature is preferable in order to maintain the decolored state in a normal use state, and ⁇ 50 to 5 ° C. is preferable. ⁇ 50 to 0 ° C. is more preferable.
- the complete color development temperature (t 1 ) is ⁇ 50 ° C. or higher.
- the hysteresis width ( ⁇ H) is generally in the range of 50 to 100 ° C., preferably 55 to 90 ° C., more preferably 60 to 80 ° C.
- the heating decoloring type component has been described above with reference to FIG. 2, but it is also possible to use a heating coloring type component.
- the hysteresis characteristics of such a heat-developing component are as shown in FIG.
- a so-called leuco dye can be used as the component (a1) that can be used in the present invention.
- a so-called leuco dye can be used.
- Specific examples include diphenylmethane phthalides, phenyl indolyl phthalides, indolyl phthalides, diphenyl methane azaphthalides, phenyl indolyl azaphthalides, fluorans, stylinoquinolines, and diazarhodamine lactones. Is mentioned.
- pyridine-based, quinazoline-based, bisquinazoline-based compounds and the like which are effective for developing fluorescent yellow to red color development, such as 4- [2,6-bis (2-ethoxyphenyl).
- An example is -4-pyridinyl] -N, N-dimethylbenzenamine.
- Examples of the electron-accepting compound of component (a2) used in the present invention include compounds having active protons and pseudo-acidic compounds (not an acid, but a compound that acts as an acid in the composition and causes component (a1) to develop color. Group), and a group of compounds having electron vacancies.
- Examples of compounds having active protons include not only monophenols having one phenol group, but also polyphenols having a plurality of phenol groups. Further, those having an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, a carboxy group and its ester or amide group, a halogen group, etc. as a substituent, bis-type, tris-type phenol, etc., and phenol-aldehyde condensation Resin etc. are mentioned. Moreover, the metal salt of the compound which has the said phenolic hydroxyl group can also be used.
- 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.
- thermochromic composition 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.
- reaction medium component (a3) that causes the electron transfer reaction by the component (a1) and the component (a2) to occur reversibly in a specific temperature range
- examples of the reaction medium component (a3) that causes the electron transfer reaction by the component (a1) and the component (a2) to occur reversibly in a specific temperature range include alcohols, esters, ketones, and ethers. Can do.
- the component (a3) has a large hysteresis characteristic (a curve plotting a change in color density due to a temperature change when the temperature is changed from a low temperature side to a high temperature side, and a high hysteresis side with respect to a color density-temperature curve.
- 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, dical Esters of acids and aromatic alcohols or branched aliphatic alcohols, dibenzyl cinnamate, heptyl stearate, didecyl adipate, dilauryl adipate, dimyristyl adipate, dicetyl adipate, distearic acid ester having a substituted aromatic ring in the molecule, an ester of a carboxylic acid having an unsubstituted aromatic ring and an
- 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 carbon number, n-pentyl alcohol or n-heptyl alcohol and an even fat having 10 to 16 carbon atoms may be used.
- esters include 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 la
- 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.
- arylalkyl ketones having a total carbon number of 12 to 24 include, 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-hept
- ethers 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.
- a compound represented by the following general formula (1) is preferably used.
- R 1 represents a hydrogen atom or a methyl group
- m represents an integer of 0 to 2
- one of X1 and X2 is — (CH 2 ) n OCOR 2 or — (CH 2 ) n COOR 2
- 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
- Y 1 and Y 2 represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms A methoxy group or a halogen
- r and p each represent an integer of 1 to 3.
- R 1 is a hydrogen atom
- R 1 is a hydrogen atom
- m is 0
- 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.
- the compound examples include octanoic acid-4-benzyloxyphenylethyl, nonanoic acid-4-benzyloxyphenylethyl, decanoic acid-4-benzyloxyphenylethyl, undecanoic acid-4-benzyloxyphenylethyl, and dodecanoic acid.
- a compound represented by the following general formula (3) can also be used.
- 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 are each a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, carbon (This represents an alkoxy group of formulas 1 to 4 and halogen.)
- the compound examples 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, and octadecane Examples include acid 1,1-diphenylmethyl and the like.
- X represents any one of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, and a halogen atom
- m represents an integer of 1 to 3
- n represents an integer of 1 to 20
- Specific examples of the compound represented by the general formula (4) include a diester of malonic acid and 2- [4- (4-chlorobenzyloxy) phenyl)] ethanol, succinic acid and 2- (4-benzyloxy). Phenyl) ethanol diester, succinic acid and 2- [4- (3-methylbenzyloxy) phenyl)] ethanol diester, glutaric acid and 2- (4-benzyloxyphenyl)] ethanol diester, glutaric acid 2- [4- (4-Chlorobenzyloxy) phenyl)] ethanol diester, adipic acid and 2- (4-benzyloxyphenyl) ethanol diester, pimelic acid and 2- (4-benzyloxyphenyl) ethanol A diester of suberic acid with 2- (4-benzyloxyphenyl) ethanol, Diester of berylic acid and 2- [4- (3-methylbenzyloxy) phenyl)] ethanol, diester of suberic acid and 2- [4- (4-ch
- a compound represented by the following general formula (5) can also be used as the component (a3).
- R represents an alkyl or alkenyl group having 1 to 21 carbon atoms, and n represents an integer of 1 to 3)
- Specific examples of the compound represented by the general formula (5) include diesters of 1,3-bis (2-hydroxyethoxy) benzene and capric acid, 1,3-bis (2-hydroxyethoxy) benzene and undecane. Diester with acid, diester with 1,3-bis (2-hydroxyethoxy) benzene and lauric acid, diester with 1,3-bis (2-hydroxyethoxy) benzene and myristic acid, 1,4-bis (hydroxy Diester of methoxy) benzene and butyric acid, diester of 1,4-bis (hydroxymethoxy) benzene and isovaleric acid, diester of 1,4-bis (2-hydroxyethoxy) benzene and acetic acid, 1,4-bis Diester of (2-hydroxyethoxy) benzene and propionic acid, 1,4-bis (2-hydroxyethoxy) Diester of benzene and valeric acid, diester of 1,4-bis (2-hydroxyethoxy) benzene and caproic acid, die
- the compound shown by following General formula (6) can also be used as said component (a3).
- 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
- n represents 1 to 20 Indicates an integer.
- Specific examples of the compound represented by the general formula (6) include diesters of succinic acid and 2-phenoxyethanol, diesters of suberic acid and 2-phenoxyethanol, diesters of sebacic acid and 2-phenoxyethanol, 1,10 A diester of decanedicarboxylic acid and 2-phenoxyethanol, a diester of 1,18-octadecanedicarboxylic acid and 2-phenoxyethanol, and the like.
- the mixing ratio of the three components (a1), (a2), and (a3) contained in the component (a) used in the present invention is determined by the color density, the color change temperature, the type of each component, etc.
- component (a1) : Component (a2): Component (a3) 1: 0.5 to 20: 5 to 200.
- Each of these components may be used in combination of two or more.
- the component (a) may be dispersed as it is in a solid cursive or a writing ink composition as it is, but the reversible thermochromic microcapsule pigment (hereinafter referred to as thermochromic microcapsule) encapsulated in the microcapsule. It is preferable to be used as This is because the reversible thermochromic composition can be kept in the same composition under the various use conditions and can exhibit the same effects.
- thermochromic microcapsule reversible thermochromic microcapsule pigment
- an arbitrary dye or pigment may be added to the microcapsule pigment to exhibit a color change (color change) from a color to a different color.
- Methods for microencapsulating the component (a) include interfacial polymerization method, interfacial polycondensation method, in situ polymerization method, submerged curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melting There are a dispersion cooling method, an air suspension coating method, a spray drying method, and the like, which are appropriately selected according to use. Further, a secondary resin film may be provided on the surface of the microcapsule according to the purpose to impart durability, or the surface characteristics may be modified for practical use.
- the form of the microcapsule pigment may be a non-circular cross section in addition to a circular cross section.
- the mass ratio of the component (a) to the microcapsule wall membrane generally satisfies the range of 7: 1 to 1: 1, preferably 6: 1 to 1: 1.
- the ratio of the component (a) to the wall film is larger than the above range, the thickness of the wall film becomes too thin and the resistance to pressure and heat tends to decrease, and the ratio of the wall film to the component (a) exceeds the above range. When it becomes large, the color density and the sharpness during color development tend to decrease.
- the above microcapsule pigment generally satisfies the practicality when the average particle size is generally from 0.1 to 50 ⁇ m, preferably from 0.3 to 30 ⁇ m, more preferably from 0.5 to 10 ⁇ m. If the average value of the maximum outer diameter of the microcapsule exceeds 50 ⁇ m, the dispersion stability may be lacking, and if the average value of the maximum outer diameter is less than 0.1 ⁇ m, it is difficult to show high density color development. is necessary.
- the average particle diameter of the microcapsules referred to in the present invention is represented by the value of D50 expressed on the volume basis when the outer diameter of the particles is measured.
- the laser diffraction / scattering particle size distribution measuring apparatus LA A value obtained by measuring an average particle diameter (median diameter) based on a numerical value measured using a ⁇ 300 type (manufactured by Horiba, Ltd .; LA-300) was used.
- thermochromic composition (B) Component for controlling the amount of heat transferred to the reversible thermochromic component
- the reversible thermochromic composition according to the present invention has the above-described reversible thermochromic component (a) discolored or discolored by heat applied from the outside. As a result, the color of the entire composition changes. At this time, by controlling the amount of heat applied to the component (a), it is possible to prevent unintended discoloration and decoloration.
- a component that controls the amount of heat transferred to the component (a) may be referred to as a component (b) for the sake of simplicity.
- Component (b) includes There are (1) one that suppresses the amount of heat itself generated by friction and the like, and (2) one that absorbs the amount of heat applied from the outside and suppresses transmission of the amount of heat to the component (a). In any case, the amount of heat applied to the component (a) is controlled, and unintended discoloration or decoloration of the component (a) can be prevented.
- component (b) having such a function (Bi) an ester compound selected from the group consisting of a sucrose fatty acid ester and a dextrin fatty acid ester, and (bii) always present in an incompatible state with the component (a), and its melting point is the component (a3) An endothermic phase change compound lower than the melting point of These (bi) and (bii) have at least one function of (1) or (2) above, but are not limited to those having only one function of (1) or (2). .
- the component (bi) mainly exhibits the function (1), but is considered to have the function (2).
- Each component (b) will be described as follows.
- component (b) Ester compound selected from the group consisting of sucrose fatty acid ester and dextrin fatty acid ester
- fatty acid ester of sucrose or dextrin can be used as component (b).
- component (b) By using such a component, unintended discoloration or decoloration of component (a) can be prevented, and the writing property can also be improved. That is, since sucrose fatty acid esters and dextrin fatty acid esters have a relatively low melting point, it is presumed that they soften during writing and absorb scratch resistance. Therefore, adding to the composition reduces writing resistance and suppresses heat generation.
- the component (a) becomes transparent because the heat generation temperature associated with friction with the paper surface becomes high, and the handwriting previously formed is It sometimes disappeared.
- the ester compound by adding the ester compound, the heat generated by friction with the paper surface at the time of writing is relieved, and the problem that the handwriting is discolored by the frictional heat generated at the time of high speed writing can be suppressed. It is possible to write at the time of writing.
- handwriting can be overcoated, and light and shade can be easily formed on the paper surface. Therefore, it is useful for full-scale coloring applications such as coloring for adults whose demand is increasing in the market these days.
- sucrose fatty acid ester that can be used in the present invention, an ester having a C12 to C22 fatty acid as a constituent fatty acid is particularly preferable, and palmitic acid and stearic acid are more preferable.
- Specific examples include Ryoto Sugar Ester (trade name) series (Mitsubishi Chemical Foods Co., Ltd.) and Sugar Wax (trade name) series (Daiichi Kogyo Seiyaku Co., Ltd.).
- an ester having a C14 to C18 fatty acid as a constituent fatty acid is particularly preferable, and palmitic acid, myristic acid, and stearic acid are more preferable.
- Leo Pearl (trade name) series manufactured by Chiba Flour Milling Co., Ltd.
- Leo Pearl (trade name) series manufactured by Chiba Flour Milling Co., Ltd.
- an endothermic phase change compound which is always incompatible with component (a) and whose melting point is lower than the melting point of component (a3)
- component (b) in the present invention an endothermic phase change compound is used.
- This compound mainly has an effect of absorbing heat and suppressing the transfer of heat to the component (a).
- This compound needs to exist in an incompatible state with the component (a) and have a melting point lower than that of the component (a3).
- the conventional reversible thermochromic composition comprises the components (a1), (a2), and (a3), and those that are in a colored state at room temperature receive heat energy from the outside.
- the conventional reversible thermochromic composition comprises the components (a1), (a2), and (a3), and those that are in a colored state at room temperature receive heat energy from the outside.
- the color is gradually erased until reaching t ′ 4 , but when it exceeds t ′ 4 which is substantially close to the melting point of the component (a3), the color is completely erased.
- t '3 and t' 4 when it is cooled to room temperature it is in a state of partially decolored.
- thermochromic composition In a conventional reversible thermochromic composition, thermal energy corresponding to the temperature difference between t ′ 3 and t ′ 4 is consumed for decoloring the composition.
- the component (bii) absorbs heat.
- the composition of the invention 'also can maintain the color development state without decoloring starts when reaching 3, t' discoloration initiation temperature t of conventional reversible thermochromic composition 3 decoloring to reach t 3 of the high temperature side than the starts.
- compositions according to the invention discoloration initiation temperature t 3 t '3 because in the high temperature side than the unintended erasure color is suppressed.
- the temperature t 4 at which the completely colored state becomes the second coloring state affects the melting point of the component (a3), and therefore, it is possible to change the color in the temperature range almost the same as that of the conventional reversible thermochromic composition. .
- a conventional solid cursive body includes a reversible thermochromic component composed of at least components (a1), (a2), and (a3), but as described above, frictional heat is generated when writing. Due to this thermal energy, a part of the handwriting is discolored. Since part of the handwriting is erased and written, the handwriting feels light and the psychology of making it darker works, making writing stronger and faster. Therefore, the frictional heat is further increased, the heat energy is increased, and the thickness is further reduced.
- the thermal energy due to frictional heat generated when the component (bii) having a lower melting point than the component (a3) first absorbs heat and writes is first. Absorb. At this time, if it is in the same system as the components (a1), (a2), and (a3), that is, in a compatible system, it rather works to help decoloration, and even more thin handwriting, and in some cases, disappears. Although there is a possibility of coloration, if the component (bii) is present in an always incompatible state of the present invention, it is used only for consuming heat energy, and thus does not affect color development. For this reason, when writing, there is no need to put unnecessary effort or to write quickly, and as a result, highly colored handwriting can be obtained.
- the component (a3) absorbs energy earlier than the component (bii), which prevents the decolorization. The effect is difficult to obtain.
- the component (bii) in the present invention has a melting point lower than that of the component (a3).
- Specific examples include organic compounds such as alcohols, carboxylic acids, esters, ethers, ketones, and amides. More specifically, the alcohols include lauryl alcohol, dodecyl alcohol, myristyl alcohol, pentadecyl alcohol, stearyl alcohol, nonadecyl alcohol, eicosyl alcohol, behenyl alcohol, seryl alcohol, melyl alcohol, polyethylene glycol, and polypropylene glycol. Etc.
- carboxylic acids examples include lauric acid, myristic acid, pentadecanoic acid, palmitic acid, stearic acid, nonadecylic acid, eicosanoic acid, and behenic acid tetracosanoic acid.
- esters include monovalent fatty acids and aliphatic monohydric alcohols, or esters having a total carbon number of 13 or more composed of monohydric alcohols having an alicyclic ring, such as pentadecyl acetate, n-tridecyl butyrate, n-pentadecyl butyrate, N-nonyl caprylate, n-undecyl caprylate, n-lauryl caprylate, n-tridecyl caprylate, n-pentadecyl caprylate, cetyl caprylate, stearyl caprylate, n-propyl caprate, n-heptyl caprate, N-undecyl caprate, n-lauryl caprate, n-tridecyl caprate, n-pentadecyl caprate, cetyl caprate, stearyl caprate, n-undecyl caproate, n-tridec
- di-n-butyl sebacate and di-n-hexyl adipate are used as esters having a total number of carbon atoms of 18 or more consisting of aliphatic divalent or polyvalent carboxylic acid and aliphatic monohydric alcohol or monohydric alcohol having an alicyclic ring.
- ethylene glycol dicaprylic acid ester ethylene glycol dicapric acid ester as esters having a total of 18 or more carbon atoms composed of aliphatic divalent or polyhydric alcohol or alicyclic divalent and polyhydric alcohol and monovalent fatty acid.
- esters having a total number of carbon atoms of 24 or more consisting of a dihydric alcohol having an aromatic ring and a monovalent fatty acid xylylene glycol dicaprylate, xylylene glycol dicaprate, xylylene glycol diundecanoate, xylylene Lenglycol dilaurate, xylylene glycol ditridecanoate, xylylene glycol dimyristic ester, xylylene glycol dipentadecanoate, xylylene glycol dipalmitate, xylylene glycol diheptadecanoate, and xylylene Examples include lenglycol distearic acid ester.
- hexyl 3,5-dimethylbenzoate, 2-methylbenzoate as esters having a total number of carbon atoms of 15 or more comprising a monovalent carboxylic acid having an aromatic ring and an aliphatic monohydric alcohol or a monohydric alcohol having an alicyclic ring.
- Decyl acid lauryl 2-methylbenzoate, myristyl 2-methylbenzoate, stearyl 2-methylbenzoate, cetyl 4-tert-butylbenzoate, behenyl 4-cyclohexylbenzoate, myristyl 4-phenylbenzoate, 4-octyl Lauryl benzoate, stearyl 3-ethylbenzoate, decyl 4-isopropylbenzoate, stearyl 4-benzoylbenzoate, stearyl 4-chlorobenzoate, myristyl 3-bromobenzoate, stearyl 2-chloro-4-bromobenzoate, Decyl 3,4-dichlorobenzoate, ammonium 2,4-dibromo Octyl benzoate, cetyl 3-nitrobenzoate, cyclohexylmethyl 4-aminobenzoate, cetyl 4-diethylaminobenzoate, stearyl 4-anilinobenzoate,
- esters having a total carbon number of 14 or more which are composed of a monovalent carboxylic acid having an aromatic ring and a monohydric alcohol having an aromatic ring, include benzyl salicylate, 4-methoxymethylphenylmethyl salicylate, 4-chlorophenylmethyl benzoate, Examples include benzyl cinnamate, phenyl 4-tert-butylbenzoate, 4-chlorobenzyl 2-methylbenzoate, and 4-methoxyphenylmethyl benzoate.
- esters having a total number of carbon atoms of 15 or more consisting of a monohydric fatty acid and a monohydric alcohol having an aromatic ring 4-chlorophenylmethyl caprylate, 4-chlorophenylmethyl caprate, 4-methoxyphenylmethyl laurate, 4-myristate 4- Methoxyphenylmethyl, 4-nitrophenylmethyl stearate, 4-methylphenylmethyl caprate, 2-chlorophenylmethyl myristate, 4-chlorophenyl 11-bromolaurate, 4-isopropylphenyl stearate, stearyl 2-naphthoate, benzyl Examples include cetyl acid, stearyl benzylate, benzyl caproate, benzyl palmitate, 3-phenylpropyl stearate, and phenyl 11-bromolaurate.
- esters having a total carbon number of 16 or more composed of a divalent fatty acid and a monohydric alcohol having an aromatic ring include dibenzyl sebacate and dineopentyl 4,4'-diphenyldicarboxylate.
- the component (bii) can be selected from among those listed as the component (a3). That is, when one material is selected as the component (a3), any component having a lower melting point can be used as the component (bii).
- the melting point of the component (bii) used in the present invention needs to be lower than the melting point of the component (a3), but the difference between the melting points is preferably about 3 to 70 ° C. If it is larger than this range, absorption of heat energy starts from a temperature lower than the temperature at which decolorization starts, so the blending ratio of component (bii) may be increased, and if it is smaller than this range, the decolorization start temperature is reached. At this time, the absorption of the thermal energy of the component (bii) becomes small, and there is a possibility that decoloring may start. When it is in the above range, it is preferable because unnecessary decoloring of the handwriting can be prevented.
- component (a3): component (bii) 1: 0.3-2. If it is smaller than this range, the amount of heat that can be absorbed by the component (bii) decreases, and there is a possibility that decoloring cannot be prevented. If it is larger than this range, the proportion of the component (a) decreases, so the color density decreases. There is a trend. Within this range, the color density of the handwriting is sufficient, and unintended decoloring can be prevented, which is preferable.
- composition of the present invention contains the component (bii)
- the component (a) and the component (a) always exist in an incompatible state, but the two are separated by an impermeable material, etc. Can be achieved.
- component (a) and component (bii) are separated by a resin that is incompatible with both.
- each of the component (a) and the component (bii) is encapsulated in a microcapsule so that the two are incompatible with each other.
- a solid writing material or a water-based ink composition for writing is used. Since it becomes easy to process when making it into a thing, it is especially preferable. It is also possible to achieve both the endothermic effect and the effect of preventing deformation due to the environmental temperature.
- the microcapsules enclosing the component (bii) are not particularly limited, but preferably have an average particle size of 0.5 to 50 ⁇ m. If the ratio is smaller than this range, the ratio of the wall film material to the microcapsules tends to be high, and the ratio of the component (bii) tends to be low. When used in a writing ink composition or a solid writing material, there is a tendency that the dispersion stability and workability are inferior. More preferably, the thickness is 1 to 30 ⁇ m, and still more preferably 1 to 20 ⁇ m. Within this range, the endothermic effect is good, and the dispersion stability and processability are improved. In addition, the measuring method of an average particle diameter is the same as the method used about the microcapsule which included the said component (a).
- the component (bi) and the component (bii) can also be used in combination. By combining these, the generation of frictional heat is suppressed by the component (bi) and the heat generated by the component (bii) is absorbed, so that an effect is synergistically exhibited.
- composition according to the present invention has various effects such as antioxidants, ultraviolet absorbers, infrared absorbers, dissolution aids, preservatives, or antifungal agents, as long as the functions thereof are not affected. Additives can be blended. These can be arbitrarily selected from conventionally known ones.
- a hindered amine compound can be added to the composition by this invention.
- the hindered amine compound there is a feature that the afterimage of the portion where the handwriting is erased becomes more difficult to be visually recognized. For this reason, it is preferable because the re-writing property can be satisfied and the merchantability can be improved without impairing the appearance of the writing surface.
- Specific examples of such hindered amine compounds are as follows.
- R 1 represents an alkyl group having 1 to 30 carbon atoms
- R 2 , R 3 , R 4 and R 5 each represents an alkyl group having 1 to 5 carbon atoms
- n represents an integer of 1 or more
- R 6 represents an n-valent organic residue.
- the hindered amine compound has a molecular weight of 1000 or less, the hindered amine compound is preferable because it is highly compatible with the binder and difficult to bleed out, and a clear handwriting can be formed even after aging.
- fusing point of the said hindered amine compound is 120 degrees C or less. Since the melting point is low, it is possible to produce a thermoreversible discoloration composition, a solid writing material using the composition, or a writing ink composition without applying excessive heat during production. Deterioration can be prevented.
- the reversible thermochromic composition according to the present invention can be combined with other components to form a writing ink composition.
- This writing ink composition has a constitution in which at least a dispersion medium and the reversible thermochromic composition are blended.
- the reversible thermochromic composition functions as a coloring material.
- the content of the reversible thermochromic composition is preferably 1 to 70% by mass with respect to the total mass of the writing ink composition. If it is smaller than this range, the color density tends to be lowered, and if it is larger than this range, the ink outflow when used in a writing instrument tends to decrease.
- the amount is preferably 5 to 45% by mass, more preferably 10 to 40% by mass, and if it is within this range, the color density can be sufficiently obtained, and the amount of ink flowing out at the time of writing is also appropriate.
- thermochromic composition contains each of the component (a) and the component (b) in a microcapsule so that both are incompatible with each other and blended into a writing ink composition, the processability and the like From the viewpoint of
- the writing ink composition according to the present invention has a constitution in which at least a dispersion medium and the reversible thermochromic composition are blended.
- a dispersion medium water and, if necessary, a solvent can be used.
- a solvent a water-soluble organic solvent is preferably used.
- a polymer flocculant can be added to the ink composition.
- the polymer flocculant causes a loose bridging action between the reversible thermochromic compositions dispersed in the writing ink composition, and exhibits a loose aggregation state.
- Ink compositions exhibiting such a loose aggregation state cause separation of the reversible thermochromic composition in the capillary gap of the ink occlusion body (filling) made of a fiber bundle and the marking pen body made of a resin bundle of fibers. It becomes difficult.
- a water-soluble polymer flocculant is preferably used, and a nonionic water-soluble polymer compound is used.
- a nonionic water-soluble polymer compound is used.
- Specific examples include polyvinyl pyrrolidone, polyethylene oxide, and water-soluble polysaccharides.
- the water-soluble polysaccharides include tragacanth gum, guar gum, pullulan, cyclodextrin, and nonionic water-soluble cellulose derivatives.
- nonionic water-soluble cellulose derivatives include methylcellulose, hydroxyethylcellulose, and hydroxypropylcellulose. , Hydroxyethylmethylcellulose, hydroxypropylmethylcellulose and the like.
- a shear thinning agent can be added to the writing ink composition of the present invention as necessary.
- a shear thinning agent when the ink composition is filled into the ballpoint pen, it prevents ink leakage from the gap between the ball and the tip when the ballpoint pen is not used, or the reversible thermochromic composition. Aggregation, sedimentation, and floating can be prevented. Furthermore, it is possible to prevent the ink from flowing backward when the writing tip is left facing upward.
- the viscosity of the ink composition for writing to which the shear thinning agent is added shows an ink viscosity of 200 to 3000 mPa ⁇ s at a shear rate of 3.84S ⁇ 1 by an E-type viscometer at 20 ° C., and It is preferable that the shear thinning index is 0.1 to 0.6.
- shear thinning agent used in the writing ink composition of the present invention examples include xanthan gum, welan gum, and succinoglycan whose constituent monosaccharide is an organic acid-modified heteropolysaccharide of glucose and galactose (average molecular weight of about 100 to 800).
- alka gum, guar gum, diutan gum, locust bean gum and its derivatives hydroxyethyl cellulose, alkyl alginates, polymers with a molecular weight of 100,000 to 150,000 based on alkyl esters of methacrylic acid, glucomannan, agar Thickening polysaccharides having gelling ability, benzylidene sorbitol and benzylidene xylitol or their derivatives, crosslinkable acrylic acid polymer, inorganic fine particles, polyglycerin fatty acid ester, polyoxyethylene Nonionic surfactants having an HLB value of 8 to 12, such as bitane fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, fatty acid amides, dialkyl or dialkenyl sulfosuccines Examples thereof include acid salts, a
- the ink composition contains a sugar mixture containing 30% by mass or more of a starch saccharified product of 8 or more sugars and / or a reduced product thereof, the drying resistance can be improved and the dripping prevention performance can be improved. Can be granted.
- the sugar mixture those containing 50% or more of saccharides having 8 or more sugars are preferably used, and more preferably those containing 70% or more of 8 or more sugars are used.
- the use of saccharides of 8 or more sugars can prevent drooping under high humidity and resistance to drying. Will also improve. Moreover, performances such as heat resistance, acid resistance, and microbial resistance are improved, and a stable state can be maintained in the writing ink composition.
- saccharides having 8 or more sugars a saccharified starch obtained by enzymatic degradation of starch or a reduced starch saccharified product obtained by reducing the terminal group of the saccharified starch can be used. Further, when starch is decomposed, saccharides having various degrees of polymerization are generated, and therefore it is technically difficult to completely isolate only saccharides having 8 or more sugars, and manufacturing costs are also increased. Therefore, in a sugar mixture containing 7 or less saccharides, the above performance can be sufficiently obtained in the ink by containing 30% by mass or more of the 8 or more saccharides, and is resistant to dripping and dripping prevention. Can be granted.
- the sugar mixture is preferably 0.5 to 10.0% by mass with respect to the total mass of the writing ink composition of the present invention. If it is smaller than this range, it tends to be difficult to obtain the effect of improving the drying resistance, and if it is larger than this range, the viscosity of the ink composition for writing increases, which may cause crying or blurring, and followability. Or a tendency to deteriorate the drying resistance in some cases. More preferably, the content is 1.0 to 8.0% by mass, and if it is within this range, the drying resistance is improved, there is no crying or blurring, and the ink following property is good.
- a higher fatty acid such as oleic acid, a nonionic surfactant having a long-chain alkyl group, a polyether-modified silicone oil, thiophosphite tri (alkoxycarbonylmethyl) Esters), thiophosphite triesters such as thiophosphite tri (alkoxycarbonylethyl ester), polyoxyethylene alkyl ether or polyoxyethylene alkyl aryl ether phosphate monoester, polyoxyethylene alkyl ether or polyoxyethylene alkyl aryl Lubricating agents such as ether phosphoric acid diesters or their metal salts, ammonium salts, amine salts, alkanolamine salts can be added to give the ball seat an anti-wear effect.
- a higher fatty acid such as oleic acid, a nonionic surfactant having a long-chain alkyl group, a polyether-modified silicone oil, thiophosphite tri (alk
- additives can be added to the writing ink composition of the present invention as necessary.
- benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, diisopropylammonium nitrite, saponin and other rust preventives carboxylic acid, sodium salt of 1,2-benzthiazolin-3-one, sodium benzoate, dehydroacetic acid
- Antiseptic / antifungal agents such as sodium, potassium sorbate, propyl paraoxybenzoate, 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine, urea, nonionic surfactant, reduced or non-reduced starch
- Hydrolysates oligosaccharides such as trehalose, sucrose, cyclodextrin, glucose, dextrin, sorbit, mannitol, sodium pyrophosphate and other wetting agents, antifoaming agents, dispersants, fluorine-based interfaces
- An arbitrary dye or pigment can be added to the ink composition to exhibit a color change (color change) from a color to a different color.
- acrylic resin styrene maleic acid copolymer resin, polyvinyl pyrrolidone, polyvinyl alcohol, dextrin, and the like can be used for fixing to paper and imparting viscosity.
- the writing ink composition of the present invention can be used by filling a writing instrument such as a marking pen, a ballpoint pen, or a writing pen with a tip attached to the writing tip.
- a writing instrument such as a marking pen, a ballpoint pen, or a writing pen with a tip attached to the writing tip.
- the structure and shape of the marking pen itself are not particularly limited.
- a marking pen tip such as a fiber tip, a felt tip, or a plastic tip is used as the tip of the writing tip.
- the ink occlusion body consisting of fiber bundles housed in the shaft cylinder is impregnated with ink, and the ink is supplied to the tip of the writing.
- the structure and shape of the ballpoint pen itself are not particularly limited.
- a writing tip in which ink is impregnated with a fiber bundle housed in a shaft cylinder and a ballpoint pen tip is attached A structure that supplies ink to the part, directly stores the ink inside the shaft cylinder, and supplies a predetermined amount of ink to the writing tip part via an ink flow rate adjusting member composed of a comb groove-like ink flow rate or a fiber bundle.
- a ballpoint pen having a structure having an ink containing tube filled with ink in a shaft cylinder, the ink containing tube communicating with a ballpoint pen tip, and a liquid stopper for preventing a backflow provided on the end face of the ink Can be illustrated.
- a tip formed by holding a ball in a ball holding portion formed by pressing and deforming the vicinity of the tip of a metal pipe inward from the outer surface, a ball formed by cutting with a metal material drill or the like examples include a chip holding a ball in the holding part, a chip holding a ball by providing a resin ball receiving seat inside a metal or plastic molded body, and the like.
- the tip may be configured to bias the ball forward by a spring body.
- those having a diameter of about 0.1 to 3.0 mm such as cemented carbide, stainless steel, ruby, ceramic, resin, rubber and the like are generally applicable, but preferably 0.3 to 1.5 mm, More preferably, one having a thickness of 0.3 to 1.0 mm is used.
- the ink storage tube for storing the writing ink composition for example, a molded body made of a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, nylon, or the like is used.
- the ball-point pen tip and the ink storage tube are fitted directly or through a connecting member, and a ball-point pen refill can be formed by filling the ink composition for writing and, if necessary, the ink backflow prevention body composition.
- the ink backflow preventive composition is composed of at least a non-volatile liquid or a hardly volatile liquid.
- the non-volatile liquid or the hardly volatile liquid include petrolatum, spindle oil, castor oil, olive oil, refined mineral oil, liquid paraffin, polybutene, ⁇ -olefin, ⁇ -olefin oligomer or co-oligomer, dimethyl silicone oil, methyl Examples thereof include phenyl silicone oil, amino-modified silicone oil, polyether-modified silicone oil, and fatty acid-modified silicone oil. One or two or more kinds can be used in combination.
- a gelling agent to the nonvolatile liquid and / or the hardly volatile liquid to increase the viscosity to a suitable viscosity.
- Hydrophobized silica on the surface fine-particle silica whose surface is methylated, aluminum silicate , Swellable mica, and clay-based thickeners such as bentonite and montmorillonite with hydrophobic treatment, fatty acid metal soaps such as magnesium stearate, calcium stearate, aluminum stearate, zinc stearate, tribenzylidene sorbitol, fatty acid amide, amide Examples thereof include modified polyethylene wax, hydrogenated castor oil, and dextrin compounds such as fatty acid dextrin, cellulose compounds and the like.
- the liquid ink backflow prevention body composition and a solid backflow prevention body can be used in combination.
- the tip of the ballpoint pen tip used in the present invention can be fixed with a resin film for preventing the tip of the pen from drying, and covers the ball at the tip end, the ball holding portion, and the gap between the ball and the ball holding portion. By sticking to the tip, it is possible to prevent the tip of the tip from drying and volatilization of the medium in the ink.
- a resin film for preventing the tip of the pen from drying, and covers the ball at the tip end, the ball holding portion, and the gap between the ball and the ball holding portion. By sticking to the tip, it is possible to prevent the tip of the tip from drying and volatilization of the medium in the ink.
- a resin for forming the resin film a thermoplastic resin, a thermosetting resin, or an ultraviolet curable resin is used.
- the ballpoint pen refill can be accommodated in a shaft tube to obtain a cap-type ballpoint pen. Further, the ballpoint pen refill can be accommodated in a shaft cylinder to obtain a retractable ballpoint pen.
- the ballpoint pen refill is stored in the shaft cylinder with the tip exposed to the outside air, and the operation of the retracting mechanism is performed. Thus, the writing tip protrudes from the shaft tube opening.
- Examples of the appearance mechanism include a knock type, a rotary type, and a slide type.
- the knock type has a knock portion on the rear end portion of the shaft tube and the side surface of the shaft tube, and by pressing the knock portion, the writing tip portion of the ballpoint pen refill is projected and retracted from the front end opening portion of the shaft tube, or on the shaft tube.
- the structure which makes the writing tip part of a ball-point pen refill appear and disappear from the axial cylinder front-end opening part by pressing the provided clip part can be illustrated.
- the rotary type has a rotating part at the rear part of the shaft cylinder, and a configuration in which the writing tip part of the ballpoint pen refill is projected and retracted from the front end part of the shaft cylinder by turning the rotating part can be exemplified.
- the slide type has a slide part on the side surface of the shaft cylinder, and the sliding tip of the writing point of the ballpoint pen refill is projected and retracted from the front end opening of the shaft cylinder by operating the slide, or the clip part provided on the shaft cylinder is slid. By doing so, it is possible to exemplify a configuration in which the writing tip portion of the ballpoint pen refill is projected and retracted from the opening at the front end of the shaft cylinder.
- the retractable ballpoint pen is a compound type retractable ballpoint pen in which a plurality of ballpoint pen refills are accommodated in a shaft cylinder, and the writing tip of one of the ballpoint pen refills protrudes and retracts from the opening at the front end of the shaft cylinder by the operation of the retractable mechanism. May be.
- the handwriting formed by the writing instrument can be decolored or discolored by rubbing with a finger, heating or applying a cooling tool.
- the heating tool examples 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.
- a friction member is used as a means capable of changing color by a simple method. Used.
- an elastic body such as an elastomer or a plastic foam which is rich in elasticity and can generate frictional heat by rubbing at the time of rubbing is preferable.
- silicone resin silicone resin, SEBS resin (styrene ethylene butadiene styrene block copolymer), polyester resin, or the like is used.
- the friction member can be a combination of a writing tool and a member of arbitrary shape (friction body) separately to obtain a writing tool set, but by providing the writing tool with a friction member, it is excellent in portability.
- the location where the friction member is provided is not particularly limited.
- the cap itself is formed of a friction member
- the shaft tube itself is formed of a friction member, or a clip is provided.
- the clip itself can be formed of a friction member, or the friction member can be provided at the rear end portion of the shaft cylinder on the opposite side where the tip end portion, side surface portion, opening end portion, or writing tip end portion of the cap is provided.
- the location where the friction member is provided is not particularly limited, but for example, the shaft cylinder itself is formed with a friction member, or when the clip is provided, the clip itself is formed with a friction member, A friction member may be provided in the vicinity of the shaft tube opening, the rear end of the shaft tube, or the knock portion.
- 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 or ice pieces, a cooling agent, a refrigerator and a freezer.
- the writing ink composition of the present invention is obtained by filling the writing instrument or the like and writing it to obtain a handwriting containing the reversible thermochromic composition, but the writing handwriting of a writing instrument using a conventional reversible thermochromic composition It has an effect that cannot be obtained.
- a writing surface where the writing surface is on both front and back sides, such as a notebook or notebook
- erasing or discoloring is performed when the handwriting recorded on the front side is erased or discolored for correction, confirmation, etc.
- the heat energy is given to the portion to be rubbed with a friction member or the like, but the given heat energy sometimes reaches the back surface.
- thermochromic composition of the present invention is not thinned or partially erased or discolored when the same operation as described above is performed.
- thermochromic composition according to the present invention can be combined with other components to form a solid cursive.
- the reversible thermochromic composition used in the solid cursive of the present invention is preferably 10 to 70% by mass 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.
- the amount is preferably 10 to 50% by mass, and more preferably 10 to 40% by mass. When the amount is within this range, the strength and handwriting density of the solid writing material can be compatible.
- the component (a) is blended in a reversible thermochromic composition in a state of being encapsulated in a microcapsule and applied to a solid cursive.
- Such an embodiment is also preferable from the viewpoint that the composition of the reversible thermochromic composition is kept constant under various use conditions, and the same effects can be achieved.
- Solid cursives always exist in a solid state, but when a certain amount of a component having a relatively low melting point such as component (bii) is included, softening or melting in an environment where the temperature is relatively high such as in summer. May cause deformation and the like. It is particularly preferable to use the component (bii) in a microencapsulated form because both the endothermic effect and the effect of preventing deformation due to environmental temperature can be achieved. On the other hand, it is possible to use the component (bi) in a state of being encapsulated in a microcapsule, but in this case, the effect of reducing the writing resistance by the component (bi) is reduced, so the component (bi) is added directly to the composition. It is preferred that
- the solid cursive material of the present invention is preferably one obtained by dispersing and solidifying the reversible thermochromic composition in a shaping material from the viewpoint of strength as a solid cursive material.
- the shaping material is for maintaining the shape as a solid cursive, and examples thereof include wax, gelling agent, clay and the like.
- wax any conventionally known wax may be used, and specifically, carnauba wax, wood wax, beeswax, microcrystalline wax, montan wax, candelilla wax, low molecular weight polyethylene, paraffin wax and the like. Can be mentioned.
- the gelling agent conventionally known ones can be used, and examples thereof include 12-hydroxystearic acid, dibenzylidene sorbitols, tribenzylidene sorbitols, amino acid oils, and alkali metal salts of higher fatty acids.
- examples of clay minerals include bentonite and montmorillonite. The above materials are used alone or in combination.
- polyolefin waxes are preferred from the viewpoints of availability and handleability.
- polyolefin wax examples include waxes such as polyethylene, polypropylene, polybutylene, ⁇ -olefin polymer, ethylene-propylene copolymer, and ethylene-butene copolymer.
- the polyolefin wax having a softening point in the range of 100 ° C. to 130 ° C. and having a penetration of 10 or less is useful because of its high writing feeling. If the penetration exceeds 10, the solid cursive text is too soft to be written, and the handwriting extends on the paper surface during rubbing and erasing (wax is thinned). Contamination, color transfer to other paper and stains. In addition, when the penetration is less than 1.5, the solid cursive is too hard and the handwriting is faint and the visibility is poor. In particular, a penetration of about 1.5 to 7 has strength and touch feeling. Is well balanced.
- the penetration is standardized in JIS K2207, and indicates the length of penetration when a specified weight of needle is entered vertically into polyolefin wax at a temperature of 25 ° C., a load of 100 g, and a penetration time of 5 seconds.
- the penetration value represents 0.1 mm as penetration. Accordingly, the polyolefin wax is harder as the penetration is smaller and softer as the penetration is larger.
- Neo Wax (trade name) series manufactured by Yasuhara Chemical Co., Ltd.
- Sun Wax (trade name) series manufactured by Sanyo Chemical Co., Ltd.
- High Wax (trade name) series manufactured by Mitsui Chemicals, Inc.
- AC polyethylene (trade name) series Honeywell
- acid-modified polyethylene wax is particularly suitable. Since acid-modified polyethylene wax has an appropriate viscosity (elasticity), it is presumed that it absorbs scratch resistance during writing. Therefore, writing resistance is reduced and writing feeling is improved. Therefore, it becomes more useful for coloring applications in the form of crayons or pencils.
- Neowax LA05 (trade name, manufactured by Yasuhara Chemical Co., Ltd.), A-C573, and 575 (all trade names, manufactured by Honeywell), High Wax 1105A, and 2203A (all trade names, Mitsui) Chemical Co., Ltd.).
- the blending ratio is preferably 0.2 to 70% by mass with respect to the total mass of the solid cursive body. If it is smaller than this range, there is a tendency that sufficient strength as a solid cursive body cannot be obtained, and if it is larger than this range, it tends to be difficult to obtain a sufficient writing density.
- the content is 0.5 to 40% by mass, and if it is within this range, both the strength and the handwriting density of the solid cursive can be achieved.
- additives can be added to the solid cursive of the present invention as necessary.
- additives include extenders, viscosity modifiers, fungicides, preservatives, antibacterial agents, and fragrances.
- the extender any conventionally known material can be used, such as talc, clay, silica, calcium carbonate, barium sulfate, alumina, mica, boron nitride, potassium titanate, glass flakes, and starch.
- talc and calcium carbonate are preferable from the viewpoint of moldability.
- the extender is blended for the purpose of improving the strength and adjusting the writing quality of the solid cursive of the present invention.
- an arbitrary dye or pigment may be added to the solid cursive body so as to exhibit a color change (color change) from a color to a different color.
- the component (a) is 10 to 60% by mass, preferably 20 to 50% by mass
- the shaping material is 30 to 70% by mass in the total amount of the solid cursive.
- 40 to 70% by mass, 5 to 30% by mass of the extender, and 0.1 to 5% by mass of the hindered amine compound are preferably contained.
- the total amount of the solid cursive is 10 to 60% by mass, preferably 20 to 50% by mass, and 10 to 40% of the shaping material. It is preferable to contain 10% by mass, 10% to 70% by mass, preferably 20% to 60% by mass, and 0.1% to 5% by mass of a hindered amine compound.
- the solid cursive body can be formed into a desired shape and applied as it is as a writing instrument, or the outer peripheral surface serving as a grip portion can be covered with paper or a resin layer.
- molded by the rod shape to the desired outer diameter is applicable as exterior accommodations, such as a pencil form coat
- the solid cursive of the present invention can be written on various writing surfaces.
- the handwriting can be discolored by rubbing with a finger or application of a heating or cooling tool.
- the heating tool examples 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.
- a friction member is used as a means capable of changing color by a simple method. Used.
- the friction tool can be combined with a solid cursive body to form a solid cursive body set.
- the friction tool and the friction member are preferably elastic bodies such as elastomers and plastic foams that are rich in elasticity and can generate appropriate friction during friction to generate frictional heat.
- ⁇ ⁇ ⁇ ⁇ ⁇ Silicone resin, SEBS resin, or polyester resin is preferably used as the material of the friction tool or friction member.
- Examples of the cooling / heating tool include a cooling / heating color change tool using a Peltier element, a cooling / heating change tool filled with a refrigerant such as cold water and ice pieces, a cooling agent, and application of a refrigerator and a freezer.
- the solid cursive of the present invention exhibits an effect that cannot be obtained with the conventional solid cursive by using the reversible thermochromic composition of the present invention. That is, in the conventional solid cursive, there was a case where the handwriting was thinned or partly decolored or discolored by writing, but the solid cursive of the present invention is also the color density of the handwriting when written. It is possible to write without lowering.
- composition of the solid cursives of the examples and comparative examples is shown in the following table.
- surface shows a mass part.
- the particle size of the microcapsule pigment is measured using a laser diffraction / scattering particle size distribution analyzer LA-300 type (trade name, manufactured by Horiba, Ltd.), and the average particle size (median diameter) based on the numerical value. ) Is a value calculated on a volume basis.
- Neowax LA05 softening point 105 ° C., needle penetration 4.5
- Yasuhara Chemical Co., Ltd. Sanyo Chemical Industries, Ltd., trade name: Sunwax 131-P (softening point 110 ° C., penetration 3.5)
- Product name: VYBAR103POLYMER softening point 70 ° C., penetration of 5.5
- BAKER HUGHES Nippon Seiki Co., Ltd., trade name: Hi-Mic-1045 (softening point 72 ° C, penetration 37)
- Product name: Ryoto Sugar Ester P-170 manufactured by Mitsubishi Chemical Foods Corporation
- Product name: Ryoto Sugar Ester S-370 manufactured by Mitsubishi Chemical Foods Corporation
- Product name: Lion MKL manufactured by Chiba Flour Milling Co., Ltd.
- the writing feeling was evaluated by the smoothness when a handwriting was drawn on paper.
- Overprinted handwriting density A Light and dark can be formed, and the handwriting visibility is excellent.
- B Although the handwriting visibility is excellent, the shading is not sufficient, and the handwriting is partially erased.
- C The handwriting is thin and difficult to visually recognize, and it is not possible to form a shading and is partially erased.
- Writing sensation A It can be written very smoothly.
- B Slightly lacking in smoothness.
- C Lack of smoothness.
- Eraseability A Can be easily rubbed and erased neatly.
- C The frictional body slides on the handwriting and cannot be erased, and the handwriting extends on the paper surface to cause dirt. It has been clarified that all the solid cursives according to the present invention achieve excellent overcoat writing density and writing feeling.
- the solid writing materials obtained in Examples 101 to 103 were set in a pay-out type plastic cylindrical container to obtain a solid writing instrument.
- a friction body made of SEBS resin is provided at the rear end of the container.
- the solid writing instrument was able to form clear handwriting, and it was also possible to form shades by overcoating. Moreover, it was able to be erase
- a solid writing instrument set was obtained by combining the above-described pencil using the solid writing bodies obtained in Examples 101 to 103 and a friction body made of SEBS resin.
- the solid writing instrument set was written on paper using a solid cursive body, it was possible to form a clear handwriting and to form a shade by overcoating. Moreover, it was able to be erase
- thermochromic microcapsules production of thermochromic microcapsules A
- component (a1) 2.5 parts by mass of 1,3-dimethyl-6-diethylaminofluorane, as component (a2), 5.0 parts by mass of 2,2-bis (4′-hydroxyphenyl) hexafluoropropane, 1-bis (4′-hydroxyphenyl) n-decane (3.0 parts by mass) and component (a3) having a color memory property of capric acid-4-benzyloxyphenylethyl (melting point: 63 ° C.) (50.0 parts by mass)
- a reversible thermochromic composition (component (a)) is dissolved by heating, and a solution obtained by mixing 30.0 parts by mass of an aromatic isocyanate prepolymer and 40.0 parts by mass of a co-solvent as a wall film material is obtained by using 8% polyvinyl alcohol.
- thermochromic microcapsule suspension After emulsifying and dispersing in an aqueous solution and stirring while heating, 2.5 parts by mass of a water-soluble aliphatic modified amine was added, and stirring was further continued to obtain a thermochromic microcapsule suspension.
- the suspension was centrifuged to isolate thermochromic microcapsules.
- the average particle size of the microcapsules is 2.0 ⁇ m, t 1 : ⁇ 20 ° C., t 2 : ⁇ 10 ° C., t 3 : 45 ° C., t 4 : 64 ° C., ⁇ (t 4 -t 3 ) : A behavior having a hysteresis characteristic of 19 ° C. was exhibited, and the color changed reversibly from orange to colorless and from colorless to orange.
- thermochromic microcapsule B 3- (4-diethylamino-2-hexyloxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide 2.0 1 part by mass, 8.0 parts by mass of 1,1-bis (4′-hydroxyphenyl) n-decane as component (a2), and 4-benzyloxyphenylethyl laurate (melting point 70 ° C.) as component (a3)
- a reversible thermochromic composition having a color memory property consisting of 0 parts by mass was dissolved by heating, and a solution prepared by mixing 30.0 parts by mass of an aromatic isocyanate prepolymer and 40.0 parts by mass of a co-solvent as a wall film material, After emulsifying and dispersing in an aqueous 8% polyvinyl alcohol solution and continuing stirring while heating, 2.5 parts by weight of a water-soluble aliphatic modified amine was added, and stirring was continued to
- thermochromic microcapsules A pusel suspension was obtained.
- the suspension was centrifuged to isolate thermochromic microcapsules.
- the average particle size of the microcapsules is 4.0 ⁇ m, t 1 : ⁇ 2 ° C., t 2 : 6 ° C., t 3 : 56 ° C., t 4 : 70 ° C., ⁇ (t 4 ⁇ t 3 ):
- a behavior having a hysteresis characteristic of 14 ° C. was exhibited, and the color changed reversibly from blue to colorless and from colorless to blue.
- thermochromic microcapsule C 3- (4-diethylamino-2-hexyloxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide 2.0 Parts by weight, 4.0 parts by weight of 1,1-bis (4′-hydroxyphenyl) hexafluoropropane as component (a2), 4.0 parts by weight of 1,1-bis (4′-hydroxyphenyl) n-decane,
- a reversible thermochromic composition having color memory property consisting of 50.0 parts by mass of caprylic acid-4-benzyloxyphenylethyl (melting point 57 ° C.) as component (a3) is dissolved by heating, and aromatic isocyanate is used as a wall membrane material
- a solution prepared by mixing 30.0 parts by mass of the prepolymer and 40.0 parts by mass of the co-solvent was emulsified and dispersed in an 8% aqueous polyvinyl alcohol solution, and
- thermochromic microcapsules The suspension was centrifuged to isolate thermochromic microcapsules.
- the average particle diameter of the microcapsule pigment is 3.0 ⁇ m, t 1 : ⁇ 24 ° C., t 2 : ⁇ 10 ° C., t 3 : 42 ° C., t 4 : 55 ° C., ⁇ (t 4 -t 3 ): A behavior having a hysteresis characteristic of 13 ° C. was exhibited, and the color changed reversibly from blue to colorless and from colorless to blue.
- endothermic microcapsule a 10 parts by mass of myristyl alcohol (melting point: 40 ° C.) was dissolved by heating and emulsified and dispersed in a 5% aqueous solution of methyl vinyl ether maleic anhydride copolymer. Stirring was continued while heating, 20 parts by weight of 35% melamine-formaldehyde initial condensate was gradually added dropwise, and stirring was continued to obtain an endothermic microcapsule suspension. The suspension was centrifuged to isolate endothermic microcapsules. The endothermic microcapsule had an endothermic peak of 42.6 ° C. and an average particle size of 5.0 ⁇ m.
- Table 3 shows the wall film of the microcapsules of the endothermic microcapsules b to k used in the present invention, the component (d) contained in the microcapsules, and the average particle size of the endothermic microcapsules. Prepared on the street.
- Example 201 (Preparation of reversible thermochromic composition) Thermochromic microcapsule A 18 parts by weight Myristyl alcohol (endothermic phase change compound) 20 parts by weight Ion exchange water 32 parts by weight The above mixture was stirred with a magnetic stirrer and mixed until uniform. The obtained mixture was dried at room temperature to obtain a reversible thermochromic composition 201.
- thermochromic composition was obtained in the same manner as in Example 201 except that the thermochromic microcapsules and endothermic microcapsules shown in Table 4 were used instead of thermochromic microcapsules A and myristyl alcohol.
- Comparative Examples 201 to 203 A reversible thermochromic composition was obtained in the same manner as in Example 201 except that the formulation shown in Table 4 was used.
- thermochromic composition obtained in Example 201 38 parts by mass Ethylene-vinyl acetate emulsion (Sumikaflex 500 manufactured by Sumika Chemtex Co., Ltd.) 3 parts by mass Ion-exchanged water 30 parts by mass
- the above composition was stirred with a magnetic stirrer. Mix until uniform.
- the obtained mixture was screen-printed to print a circle of a predetermined size on fine paper and dried at room temperature to obtain a sample for confirming discoloration behavior.
- the sample was heated and cooled by the following method to confirm discoloration behavior.
- the sample is set in a predetermined position of a color difference meter [TC-3600 type color difference meter (trade name, manufactured by Tokyo Denshoku Co., Ltd.)], and heated and cooled at a rate of 10 ° C./min in a temperature range of 0 to 100 ° C.
- the color density at each temperature was measured.
- Table 4 shows the measurement results of the color erasing start temperature t 3 , the complete color erasing temperature t 4 , and the temperature difference ⁇ (t 4 -t 3 ) between the complete color erasing temperature and the color erasing start temperature. .
- thermochromic composition of the present invention is t 3 is discolored initiation temperature, only thermochromic microcapsules is a conventional reversible thermochromic composition It can be seen that there is a shift to the high temperature side as compared with the color change starting temperature when using. Further, as shown in Comparative Example 1, when an endothermic phase change compound higher than the melting point of component (a3) is used as component (bii), the color change starting temperature is compared with the case where only thermochromic microcapsules are used. And there was no change. As described above, it is clear that the reversible thermochromic composition of the present invention is excellent in the color changing properties.
- Example 212 (Preparation of ink composition for writing) Thermochromic microcapsule A 18 parts by mass Heat-absorbing microcapsule a 20 parts by mass Urea 10 parts by mass Glycerin 10 parts by mass Phosphate ester surfactant 0.5 part by mass Nonionic permeation imparting agent 0.6 part by mass Modification Silicone defoamer 0.1 part by weight Antiseptic / antifungal agent 0.1 part by weight Triethanolamine 0.5 part by weight Ion-exchanged water 39.9 parts by weight Was made. Thereafter, 0.3 part by weight of succinoglycan (shear thinning agent) was added while heating the base ink prepared above, and the mixture was sufficiently mixed and stirred using a homogenizer stirrer. Then, it filtered using the filter paper and obtained the ink composition for writing.
- succinoglycan sucinoglycan
- Example 213 (Preparation of ink composition for writing) Thermochromic microcapsule C 18 parts by weight Heat-absorbing microcapsule c 20 parts by weight Sugar mixture 3 parts by weight Phosphate ester surfactant 0.5 part by weight Antiseptic / antifungal agent 0.1 part by weight Triethanolamine 0. 5 parts by mass Ion-exchanged water 57.1 parts by mass
- the above composition was heated and stirred with a magnetic hot stirrer to prepare a base ink. Thereafter, 0.3 part by weight of succinoglycan (shear thinning agent) was added while heating the base ink prepared above, and the mixture was sufficiently mixed and stirred using a homogenizer stirrer. Then, it filtered using the filter paper and obtained the ink composition for writing.
- Example 214 (Preparation of ink composition for writing) Thermochromic microcapsule B 18 parts by mass Heat-absorbing microcapsule b 20 parts by mass Hydroxyethylcellulose 0.5 part by mass Glycerin 18 parts by mass 10% -phosphoric acid aqueous solution 0.1 part by mass Modified silicone antifoaming agent 0.02 parts by mass Part Antiseptic / antifungal agent 1.5 parts by mass Ion-exchanged water 41.88 parts by mass The above composition was heated and stirred with a magnetic hot stirrer and mixed and stirred until it became uniform, followed by filtration using filter paper. Thus, a writing ink composition was obtained.
- Comparative Examples 204 and 205 A writing ink composition was obtained in the same manner as in Example 212 except that the composition shown in Table 5 was used.
- Comparative Examples 206 and 207 A writing ink composition was obtained in the same manner as in Example 214 except that the formulation shown in Table 5 was used.
- a stainless steel ballpoint pen tip holding a ball with a diameter of 0.7 mm is fitted into one end of a polypropylene ink container through a resin tip holder, and a ballpoint pen refill with a pressure spring inside
- the ink composition for writing of Example 212 and Comparative Example 204 was filled, and a grease-like ink backflow preventive body was disposed so as to contact the ink composition on the side opposite to the ballpoint pen tip, and subjected to centrifugal treatment.
- a ballpoint pen refill was prepared.
- the ball-point pen refill was incorporated into a writing instrument shaft cylinder (consisting of a front shaft cylinder and a rear shaft cylinder), and a cap with a rubber seal was fitted therein to form a so-called cap-type ball pen.
- the rear shaft cylinder was provided with a friction member made of SEBS resin.
- Example 213 is a ballpoint pen refill in which a stainless steel ballpoint pen tip holding a 0.7 mm diameter ball is fitted to one end of a polypropylene ink containing cylinder through a resin tip holder, and a pressing spring is arranged inside.
- the ink composition for writing of Comparative Example 205 was filled, and a grease-like ink backflow preventive body was disposed so as to be in contact with the ink composition on the side opposite to the ballpoint pen tip, and subjected to a centrifugal treatment, and the ballpoint pen refill was performed.
- the ball-point pen refill was incorporated into a writing instrument shaft to form a retractable ball-point pen.
- a friction member made of SEBS resin was provided around the shaft cylinder tip opening.
- An ink occlusion body in which a polyester sliver is coated with a synthetic resin film is impregnated with the writing ink compositions of Example 14 and Comparative Examples 206 and 207, and accommodated in a shaft tube made of polypropylene resin, and the shaft tube is connected via a connecting member. It was assembled so that a marking pen tip made of polyester fiber was connected to the tip, and a cap with a rubber seal was fitted, so that a so-called cap-type marking pen was formed.
- the cap was provided with a friction member made of SEBS resin.
- Writability Written on writing paper A using the prepared writing implement, and the handwriting at that time was evaluated visually.
- Erasability The handwriting evaluated for writing property was scratched using the friction member of each of the prepared writing instruments, and the erasing property at that time was evaluated visually.
- Backside handwriting preservability Writing was performed on the surface of writing paper A using the prepared writing tool, and writing was performed on the backside of the handwriting using the same writing tool. Subsequently, the handwriting on the back surface was visually evaluated when the surface handwriting was scraped off using the friction member of each of the prepared writing instruments.
- C The handwriting is erased and cannot be visually recognized.
- the writing ink composition using the reversible thermochromic composition of the present invention was excellent in writing property and erasability. Furthermore, the handwriting written with the writing ink composition of the present invention was not erased by frictional heat generated by rubbing the back side of the paper. On the other hand, the writing ink compositions shown in Comparative Examples 204 to 207 had no problem with respect to writing erasability, but the backside handwriting preservability was inferior. As described above, it is apparent that the writing ink composition of the present invention is excellent in writing / erasing characteristics.
- Example 215 Production of solid cursive thermochromic microcapsule A 18 parts by mass Heat-absorbing microcapsule a 20 parts by mass Polyethylene wax 62 parts by mass The above composition was kneaded with a kneader, and the obtained kneaded product was obtained with a press. Compression molding was performed to obtain a solid cursive body having an outer diameter of 3 mm and a length of 60 mm.
- Examples 216-218 A solid cursive material was obtained in the same manner as in Example 215 except that the formulation shown in Table 6 was used.
- Comparative Examples 208-210 A solid cursive material was obtained in the same manner as in Example 215 except that the formulation shown in Table 6 was used.
- Writing taste Writing was made on writing paper A using a solid cursive body, and the writing taste at that time was evaluated by a sensory test.
- Writability Written on writing paper A using a solid cursive body, and the handwriting density at that time was visually evaluated.
- C The handwriting is discolored and thin, and cannot be visually recognized.
- Erasability The handwriting evaluated for writing property was scratched with a friction member made of SEBS, and the erasability at that time was evaluated visually.
- the solid cursive material using the reversible thermochromic composition of the present invention was excellent in writing quality, writing property and erasability.
- the solid cursive materials shown in Comparative Examples 208 to 210 had no problem with erasability, but it was confirmed that the handwriting became thin due to frictional heat generated during writing, and the writing property was inferior. .
- the solid cursive of the present invention is excellent in writing characteristics.
- thermochromic composition of the present invention As is clear from the above evaluation results, the reversible thermochromic composition of the present invention, the writing ink composition using the composition, and the solid cursive are superior in color development and decoloring properties as compared with the conventional ones. It is clear.
- the composition was heated and dissolved, and a solution prepared by mixing 30.0 parts by mass of an aromatic isocyanate prepolymer and 40.0 parts by mass of a co-solvent as a wall film material was emulsified in an 8% aqueous polyviny
- thermochromic microcapsule suspension Distributed to, stirring was continued while heating, water-soluble aliphatic modified amine 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.
- thermochromic microcapsule E 1.0 ′ of 1 ′ (3′H) -isobenzofuran] -3-one, 3.0 parts of 4,4 ′-(2-ethylhexane-1,1-diyl) diphenol as component (a2), 2 , 2-bis (4′-hydroxyphenyl) -hexafluoropropane, and 50.0 parts by mass of capric acid-4-benzyloxyphenylethyl (melting point 63 ° C.) as component (a3)
- a reversible thermochromic composition having the above composition is heated and dissolved, and a solution in which 30.0 parts by mass of an aromatic isocyanate prepolymer and 40.0 parts by mass of a co-solvent are mixed as a wall film material
- thermochromic microcapsule suspension After emulsifying and dispersing and stirring while heating, 2.5 parts by mass of a water-soluble aliphatic modified amine was added, and stirring was further continued to obtain a thermochromic microcapsule suspension. The suspension was centrifuged to isolate thermochromic microcapsules. The average particle size of the microcapsules is 2.3 ⁇ m, t ′ 1 : ⁇ 20 ° C., t ′ 2 : ⁇ 10 ° C., t ′ 3 : 48 ° C., t ′ 4 : 58 ° C., ⁇ H: 68 ° C.
- Color memory comprising 5 parts of hexafluoropropane, 3.0 parts of 4,4 ′-(2-methylpropylidene) bisphenol and 50 parts of 4-benzyloxyphenylethyl laurate (melting point 70 ° C.) as component (a3)
- a reversible thermochromic composition having a temperature is dissolved by heating, and a solution prepared by mixing 30.0 parts by mass of an aromatic isocyanate prepolymer and 40.0 parts by mass of a co-solvent as a wall film material is emulsified in an 8% aqueous polyvinyl alcohol solution.
- thermochromic microcapsule suspension Disperse and continue stirring while warming, then add 2.5 parts by weight of water-soluble aliphatic modified amine and continue stirring to obtain a thermochromic microcapsule suspension. .
- the suspension was centrifuged to isolate thermochromic microcapsules.
- endothermic microcapsule 10 parts by mass of myristyl alcohol (melting point: 40 ° C.) was dissolved by heating and emulsified and dispersed in an aqueous solution of 5% methyl vinyl ether maleic anhydride copolymer. Stirring was continued while heating, 20 parts by weight of 35% melamine-formaldehyde initial condensate was gradually added dropwise, and stirring was continued to obtain an endothermic microcapsule suspension. The suspension was centrifuged to isolate endothermic microcapsules. The endothermic microcapsule had an endothermic peak of 42.6 ° C. and an average particle size of 5.0 ⁇ m.
- Table 7 shows the wall film of the microcapsules of the endothermic microcapsules n to q used in the production examples of the endothermic microcapsules n to q, the component (bii) included in the microcapsules, and the average particle size of the endothermic microcapsules. .
- Example 301 Production of solid cursive material Microcapsule pigment D 30 parts by mass Heat-absorbing microcapsule m 25 parts by mass Polyolefin wax I 12.5 parts by mass (Sanwax 131-P (trade name) manufactured by Sanyo Chemical Industries, Ltd.) Softening point 110 ° C penetration 3.5) Sucrose fatty acid ester i 8 parts by mass (Ryoto Sugar Ester P-170 (trade name) manufactured by Mitsubishi Chemical Foods Corporation) Hindered amine (TINSFIN765 (trade name) manufactured by BASF) 1.5 parts by weight Polyvinyl alcohol 2 parts by weight Wood wax 0.6 parts by weight Talc (extrinsic material) 20.4 parts by weight The above blend was kneaded in a kneader and obtained. The kneaded product was compression-molded with a press to obtain a solid cursive body having an outer diameter of 3 mm and a length of 60 mm.
- Examples 302-306 A solid cursive material was obtained in the same manner as in Example 1 except that the formulation shown in Table 8 was used.
- Writing taste Writing was made on writing paper A using a solid cursive body, and the writing taste at that time was evaluated by a sensory test.
- Handwriting visibility Writing was performed on writing paper A using a solid cursive body, and the handwriting density at that time was visually evaluated.
- Handwriting erasability The handwriting which evaluated handwriting visibility was rubbed using the friction member made from SEBS, and the erasing property at that time was evaluated visually.
- Overcoatability Using a solid cursive body, a 1.5 cm width reciprocating writing (300 g load) was performed 10 times within 0.5 cm in length on the surface of writing paper A, and the handwriting was visually observed. A: Light and shade can be formed, and handwriting visibility is excellent. B: Although the handwriting visibility is excellent, the density formation is not sufficient, and the handwriting is partially erased. C: The handwriting is thin and difficult to visually recognize, and it is not possible to form a shading and is partially erased.
- Backside handwriting preservability Written on the surface of writing paper A using a solid handwriting, and written on the backside of the handwriting using the same writing tool. Subsequently, the handwriting on the back surface was visually evaluated when the surface handwriting was scraped off using the friction member of each of the prepared writing instruments.
- C The handwriting is erased and cannot be visually recognized.
- the solid cursive of the present invention was excellent in all of writing quality, handwriting visibility, handwriting erasability, overcoatability, and backside handwriting preservability.
- the solid cursive materials shown in Comparative Examples 301 to 307 were inferior in any of the items of writing taste, handwriting visibility, handwriting erasability, overcoatability, and backside handwriting preservability.
- the solid cursive of the present invention is superior in function as a solid cursive, such as color development and decoloring characteristics, as compared with the conventional one.
- the reversible thermochromic composition of the present invention includes materials for various products such as printing inks, paints, writing ink compositions, solid writing materials, paints, cosmetics, and colored liquids for textiles, as well as dolls or Animal figure toys, dolls or animal figure toy hair, doll houses and furniture, clothing, hats, bags, shoes and other doll accessories, accessory toys, plush toys, drawing toys, toy picture books, puzzle toys such as jigsaw puzzles, Block toys, block toys, clay toys, fluid toys, tops, traps, musical instrument toys, cooking toys, gun toys, capture toys, background toys, vehicles, animals, plants, buildings, toys that imitate food, T-shirts, Trainers, blouses, dresses, swimsuits, raincoats, ski wears, footwear such as shoes and shoelaces, handicrafts such as handkerchiefs, towels, furoshiki, carpets, curtains, curtain strings, table hooks , Rugs, cushions, frame, interior decorations such as artificial flowers, bedding such as duvets, pillows, mattresses
- the ink composition for writing of this invention can be utilized for various writing tools, such as ink for inkjet, marking pen, ball-point pen, fountain pen, and brush pen.
- the solid cursive of the present invention can be used as a temperature indicating material in addition to a writing instrument.
Abstract
Description
(a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体と、
を含んでなる可逆熱変色性成分(a)、および
(b)前記可逆熱変色性成分に伝達される熱量を制御する成分
の組み合わせを含んでなることを特徴とするものである。
(a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体と
を含んでなる可逆熱変色性成分(a)を内包した可逆熱変色性マイクロカプセル顔料と、
(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物と、
(c)ポリオレフィンワックスと、
を含んでなることを特徴とするものである。
(a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体とからなる可逆熱変色性成分(a)を内包した可逆熱変色性マイクロカプセル顔料と、
(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物と、
(bii)可逆熱変色性成分(a)と常に非相溶の状態で存在し、かつその融点が、成分(a3)の融点より低い吸熱相変化化合物と
(c)ポリオレフィンワックスと、
を含んでなることを特徴とするものである。
(a)可逆熱変色性成分
本発明において用いられる可逆熱変色性成分(以下、簡単のために成分(a)とういうことがある)とは、後述する(a1)~(a3)成分を含むものであるが、このような成分(a)のひとつは、下記のような特性を有する、ヒステリシス幅が比較的小さい特性(ΔH=1~7℃)を有するものである。
(i)所定の温度(変色点)を境としてその前後で変色し、高温側変色点以上の温度域で消色状態、低温側変色点以下の温度域で発色状態を呈する、
(ii)常温域では、前記した消色状態および発色状態のうち特定の一方の状態しか存在しない、
(iii)加熱により高温側変色点以上の温度となるか、冷却により低温側変色点以下の温度になることによって、もう一方の状態となり、その温度が維持されている間はその状態が維持されるが、前記加熱または冷却の適用がなくなれば常温域で呈する状態に戻る(図1参照)。
3,3-ビス(p-ジメチルアミノフェニル)-6-ジメチルアミノフタリド、
3-(4-ジエチルアミノフェニル)-3-(1-エチル-2-メチルインドール-3-イル)フタリド、
3,3-ビス(1-n-ブチル-2-メチルインドール-3-イル)フタリド、
3,3-ビス(2-エトキシ-4-ジエチルアミノフェニル)-4-アザフタリド、
3-〔2-エトキシ-4-(N-エチルアニリノ)フェニル〕-3-(1-エチル-2-メチルインドール-3-イル)-4-アザフタリド、
3,6-ジフェニルアミノフルオラン、
3,6-ジメトキシフルオラン、
3,6-ジ-n-ブトキシフルオラン、
2-メチル-6-(N-エチル-N-p-トリルアミノ)フルオラン、
3-クロロ-6-シクロヘキシルアミノフルオラン、
2-メチル-6-シクロヘキシルアミノフルオラン、
2-(2-クロロアニリノ)-6-ジ-n-ブチルアミノフルオラン、
2-(3-トリフルオロメチルアニリノ)-6-ジエチルアミノフルオラン、
2-(N-メチルアニリノ)-6-(N-エチル-N-p-トリルアミノ)フルオラン、
1,3-ジメチル-6-ジエチルアミノフルオラン、
2-クロロ-3-メチル-6-ジエチルアミノフルオラン、
2-アニリノ-3-メチル-6-ジエチルアミノフルオラン、
2-アニリノ-3-メチル-6-ジ-n-ブチルアミノフルオラン、
2-キシリジノ-3-メチル-6-ジエチルアミノフルオラン、
1,2-ベンツ-6-ジエチルアミノフルオラン、
1,2-ベンツ-6-(N-エチル-N-イソブチルアミノ)フルオラン、
1,2-ベンツ-6-(N-エチル-N-イソアミルアミノ)フルオラン、
2-(3-メトキシ-4-ドデコキシスチリル)キノリン、
スピロ〔5H-(1)ベンゾピラノ(2,3-d)ピリミジン-5,1’(3’H)イソベンゾフラン〕-3’-オン、
2-(ジエチルアミノ)-8-(ジエチルアミノ)-4-メチル-スピロ〔5H-(1)ベンゾピラノ(2,3-g)ピリミジン-5,1’(3’H)イソベンゾフラン〕-3-オン、
2-(ジ-n-ブチルアミノ)-8-(ジ-n-ブチルアミノ)-4-メチル-スピロ〔5H-(1)ベンゾピラノ(2,3-g)ピリミジン-5,1’(3’H)イソベンゾフラン〕-3-オン、
2-(ジ-n-ブチルアミノ)-8-(ジエチルアミノ)-4-メチル-スピロ〔5H-(1)ベンゾピラノ(2,3-g)ピリミジン-5,1’(3’H)イソベンゾフラン〕-3-オン、
2-(ジ-n-ブチルアミノ)-8-(N-エチル-N-i-アミルアミノ)-4-メチル-スピロ〔5H-(1)ベンゾピラノ(2,3-g)ピリミジン-5,1’(3’H)イソベンゾフラン〕-3-オン、
2-(ジブチルアミノ)-8-(ジペンチルアミノ)-4-メチル-スピロ[5H-(1)ベンゾピラノ(2,3-g)ピリミジン-5,1’(3’H)-イソベンゾフラン]-3-オン、
3-(2-メトキシ-4-ジメチルアミノフェニル)-3-(1-ブチル-2-メチルインドール-3-イル)-4,5,6,7-テトラクロロフタリド、
3-(2-エトキシ-4-ジエチルアミノフェニル)-3-(1-エチル-2-メチルインドール-3-イル)-4,5,6,7-テトラクロロフタリド、
3-(2-エトキシ-4-ジエチルアミノフェニル)-3-(1-ペンチル-2-メチルインドール-3-イル)-4,5,6,7-テトラクロロフタリド、
4,5,6,7-テトラクロロ-3-[4-(ジメチルアミノ)-2-メチルフェニル]-3-(1-エチル-2-メチル-1H-インドール-3-イル)-1(3H)-イソベンゾフラノン、
3´,6´-ビス〔フェニル(2-メチルフェニル)アミノ〕-スピロ[イソベンゾフラン-1(3H),9´-〔9H〕キサンテン]-3-オン、
3´,6´-ビス〔フェニル(3-メチルフェニル)アミノ〕-スピロ[イソベンゾフラン-1(3H),9´-〔9H〕キサンテン]-3-オン、および
3´,6´-ビス〔フェニル(3-エチルフェニル)アミノ〕-スピロ[イソベンゾフラン-1(3H),9´-〔9H〕キサンテン]-3-オン等
を挙げることができる。
本発明による可逆熱変色性組成物は、前記した可逆熱変色性成分(a)が、外部から加えられる熱によって変色または消色することにより組成物全体の色が変化する。このとき、成分(a)に加えられる熱量を制御することで、意図しない変色や消色を防ぐことが可能となる。このような成分(a)に伝達される熱量を制御する成分を、以下簡単のために成分(b)ということがある。
(1)摩擦などにより発生する熱量そのものを抑制するもの、および
(2)外部から加えられた熱量を吸収して成分(a)への熱量の伝達を抑制するもの
がある。いずれの場合でも成分(a)に加えられる熱量が制御され、成分(a)の意図しない変色や消色を防ぐことができる。
(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物、および
(bii)成分(a)と常に非相溶の状態で存在し、かつその融点が、前記成分(a3)の融点より低い吸熱相変化化合物
が挙げられる。これら(bi)および(bii)は、上記の(1)または(2)の少なくとも一方の機能を有するが、(1)または(2)の一方のみの機能を有するものに限定されるものでは無い。例えば成分(bi)は上記(1)の機能を主に発揮するが、(2)の機能も併せ持つものと考えられている。成分(b)のそれぞれについて説明すると以下の通りである。
本発明において、成分(b)としてショ糖やデキストリンの脂肪酸エステルを用いることができる。このような成分を用いることで、成分(a)の意図しない変色または消色を防ぐことができるとともに、筆記性を改良することもできる。すなわち、ショ糖脂肪酸エステルやデキストリン脂肪酸エステルは、比較的低融点であるため、筆記時に軟化して擦過抵抗を吸収すると推測される。そのため、組成物中に添加することで筆記抵抗を低減し発熱が抑制される。例えば、従来の可逆熱変色性固形筆記体を用いて早書きした場合、紙面との摩擦に伴う発熱温度が高くなるために成分(a)が透明化してしまい、先に形成されていた筆跡が消色してしまうことがあった。これに対して本発明においては前記エステル化合物を添加することで、筆記時の紙面との摩擦に伴う発熱を和らげ、高速筆記時に生じる摩擦熱によって筆跡が消色してしまう不具合を抑制することができ、筆記時の早書きが可能となるものと考えられる。
本発明における成分(b)として、吸熱相変化化合物を用いることができる。この化合物は、主として熱を吸収して成分(a)に熱が伝達されるのを抑制する効果を有するものである。この化合物は成分(a)とは非相溶の状態で存在し、かつ融点が成分(a3)よりも低いことが必要である。
本発明による組成物は、その機能に影響を及ぼさない範囲で、酸化防止剤、紫外線吸収剤、赤外線吸収剤、溶解助剤、防腐剤、または防黴剤などの各種添加剤を配合することができる。これらは従来知られているものから任意に選択して用いることができる。
このようなヒンダードアミン化合物の具体例は以下の通りである。
ビス(2,2,6,6-テトラメチル-4-ピペリジル)セバケート、
ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)セバケート、
ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)セバケートとメチル1,2,2,6,6-ペンタメチル-4-ピペリジルセバケートとの混合物、
ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)[[3,5-ビス(1,1-ジメチルエチル)-4-ヒドロキシフェニル]メチル]ブチルマロネート
2-(3,5-ジ-t-ブチル-4-ヒドロキシベンジル)-2-n-ブチルマロン酸ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)、
テトラキス(1,2,2,6,6-ペンタメチル-4-ピペリジル)-1,2,3,4-ブタンテトラカルボキシレート、
1,2,3,4-ブタンテトラカルボン酸と1、2,2,6,6-ペンタメチル-4-ピペリジノール及び3,9-ビス(2-ヒドロキシ-1,1-ジメチルエチル)-2,4,8,10-テトラオキサスピロ〔5.5〕ウンデカンとの混合エステル化物、
1,2,3,4-ブタンテトラカルボン酸と1,2,2,6,6-ペンタメチル-4-ピペリジノール及び1-トリデカノールとの混合エステル化物、
1,2,2,6,6-ペンタメチル-4-ピペリジル-メタクリレート、
N,N’,N’’,N’’’-テトラキス-(4,6-ビス-(ブチル-(N-メチル-2,2,6,6-テトラメチルピペリジン-4-イル)アミノ)-トリアジン-2-イル)-4,7-ジアザデカン-1,10-ジアミン、
N-メチル-3-ドデシル-1-(2,2,6,6-テトラメチル-4-ピペレジニル)ピロリジン-2,5-ジオン、
ポリ[{6-(1,1,3,3-テトラメチルブチル)アミノ-1,3,5-トリアジン-2,4-ジイル}{2,2,6,6-テトラメチル-4-ピペリジル}イミノ]ヘキサメチレン{(2,2,6,6-テトラメチル-4-ピペリジル)イミノ})、
コハク酸ジメチルと4-ヒドロキシ-2,2,6,6-テトラメチル-1-ピペリジンエタノールの重合物、
コハク酸ジメチルと4-ヒドロキシ-2,2,6,6-テトラメチル-1-ピペリジンエタノールとの重合物とN,N’,N’’,N’’’-テトラキス-(4,6-ビス-
(ブチル-(N-メチル-2,2,6,6-テトラメチルピペリジン-4-イル)アミノ)-トリアジン-2-イル)-4,7-ジアザデカン-1,10-ジアミンとの1対1の反応生成物、
ジブチルアミン・1,3-トリアジン・N,N’-ビス(2,2,6,6-テトラメチル-4-ピペリジル-1,6-ヘキサメチレンジアミンとN-(2,2,6,6-テトラメチル-4-ピペリジル)ブチルアミンとの重縮合物、
デカン二酸ビス(2,2,6,6-テトラメチル-1-(オクチルオキシ)-4-ピペリジニル)エステル(1,1-ジメチルエチルヒドロペルオキシド)とオクタンとの反応生成物、および
シクロヘキサンと過酸化N-ブチル-2,2,6,6-テトラメチル-4-ピペリジンアミン-2,4,6-トリクロロ-1,3,5-トリアジンとの反応生成物と2-アミノエタノールとの反応生成物等を例示することができる。
本発明による可逆熱変色性組成物は、その他の成分を組み合わせて、筆記用インキ組成物とすることができる。この筆記用インキ組成物は、少なくとも分散媒と前記可逆熱変色性組成物を配合した構成となっている。この筆記用インキ組成物において、可逆熱変色性組成物は、色材としての働きを持つ。
本発明による可逆熱変色性組成物は、その他の成分を組み合わせて、固形筆記体とすることができる。
以下の表に実施例及び比較例の固形筆記体の組成を示す。尚、表中の組成の数値は質量部を示す。また、マイクロカプセル顔料の粒子径はレーザ回折/散乱式粒子径分布測定装置LA-300型(商品名、株式会社堀場製作所製)を用いて測定してその数値を基に平均粒子径(メジアン径)を体積基準で算出した値である。
(1)成分(a1)として4,5,6,7-テトラクロロ-3-〔4-(ジエチルアミノ)-2-メチルフェニル〕-3-〔1-エチル-2-メチル-1H-インドール-3-イル〕-1(3H)-イソベンゾフラノン1.5部、成分(a2)として2,2-ビス(4’-ヒドロキシフェニル)ヘキサフルオロプロパン5.0部、4,4’-(2-メチルプロピリデン)ビスフェノール3.0部、成分(a3)としてカプリン酸4-ベンジルオキシフェニルエチル50.0部からなる色彩記憶性を有する加熱消色型の可逆熱変色性組成物を内包した可逆熱変色性マイクロカプセル顔料(T1:-16℃、T2:-8℃、T3:48℃、T4:58℃、ΔH:65℃、平均粒子径:2.5μm、可逆熱変色性組成物:壁膜=2.6:1.0、青色から無色に色変化する)
(2)成分(a1)として2-(ジブチルアミノ)-8-(ジペンチルアミノ)-4-メチル-スピロ[5H-[1]ベンゾピラノ[2,3-g]ピリミジン-5,1’(3’H)-イソベンゾフラン]-3-オン1.0部、成分(a2)として4,4’-(2-エチルヘキサン-1、1-ジイル)ジフェノール3.0部、2,2-ビス(4’-ヒドロキシフェニル)-ヘキサフルオロプロパン5.0部、成分(a3)としてカプリン酸4-ベンジルオキシフェニルエチル50.0部からなる色彩記憶性を有する加熱消色型の可逆熱変色性組成物を内包したマイクロカプセル顔料(T1:-20℃、T2:-10℃、T3:48℃、T4:58℃、ΔH:68℃、平均粒子径:2.3μm、可逆熱変色性組成物:壁膜=2.6:1.0、ピンク色から無色に色変化する)
(3)成分(a1)として2-(2-クロロアニリノ)-6-ジ-n-ブチルアミノフルオラン5部、成分(a2)として2,2-ビス(4’-ヒドロキシフェニル)ヘキサフルオロプロパン5部、4,4’-(2-メチルプロピリデン)ビスフェノール3.0部、成分(a3)としてラウリン酸4-ベンジルオキシフェニルエチル50部からなる色彩記憶性を有する加熱消色型の可逆熱変色性組成物を内包した可逆熱変色性マイクロカプセル顔料(T1:-8℃、T2:-1℃、T3:52℃、T4:65℃、ΔH:63℃、平均粒子径:3.0μm、可逆熱変色性組成物:壁膜=2.6:1.0、黒色から無色に色変化する)
(4)三井化学株式会社製、商品名:ハイワックス1105A(軟化点108℃、針入度6)
(5)ヤスハラケミカル株式会社製、商品名:ネオワックスLA05(軟化点105℃、針入度4.5)
(6)三洋化成工業株式会社製、商品名:サンワックス131-P(軟化点110℃、針入度3.5)
(7)BAKER HUGHES社製、商品名:VYBAR103POLYMER(軟化点70℃、針入度5.5)
(8)日本精鑞株式会社製、商品名:Hi-Mic-1045(軟化点72℃、針入度37)
(9)三菱化学フーズ株式会社製、商品名:リョートーシュガーエステルP-170
(10)三菱化学フーズ株式会社製、商品名:リョートーシュガーエステルS-370
(11)千葉製粉株式会社製、商品名:レオパールMKL
(12)BASF社製、商品名:TINUVIN765
ポリオレフィンワックス中に各成分を添加し、加熱しながら混合溶融した後、押出成形にて鉛筆芯を成形することで固形筆記体(鉛筆用芯)を得た。
得られた鉛筆芯形態の固形筆記体を用いて、丸形木軸内に収納成形することで試料用鉛筆を得た。
前記固形筆記体を-20℃以下に冷却して可逆熱変色性組成物を発色させた後、紙面上に筆記すると、いずれも筆跡を形成することができた。また、前記筆跡は、SEBS樹脂からなる摩擦体を用いて摩擦することにより消去(消色)された。
重ね塗り筆跡濃度
A:濃淡形成ができ、筆跡の視認性に優れる。
B:筆跡の視認性に優れるが、濃淡形成が充分ではなく、筆跡が部分的に消去される。
C:筆跡が薄く視認し難く、濃淡形成ができず部分的に消去される。
筆記感
A:非常に滑らかに筆記することができる。
B:やや滑らかさに欠ける。
C:滑らかさに欠ける。
消去性
A:容易に摩擦でき、きれいに消去できる。
C:筆跡上で摩擦体が滑って消去できない、筆跡が紙面上に伸びて汚れを生じる。
本発明による固形筆記体は、いずれも優れた重ね塗り筆記濃度と筆記感を達成していることが明らかとなった。
実施例101~103で得た固形筆記体を繰出し式のプラスチック製円筒状容器にセットして固形筆記具を得た。尚、容器の後端部にSEBS樹脂からなる摩擦体を設けてなる。
前記固形筆記具は、紙面上に筆記すると、鮮明な筆跡を形成することができ、重ね塗りによる濃淡形成も可能であった。また、容器の後端部に設けた摩擦体を用いて筆跡を摩擦することにより残色を生じることなく消去できた。前記固形筆記具は摩擦体を備えているため携帯性に優れた固形筆記体であった。
実施例101~103で得た固形筆記体を用いた前述の鉛筆と、SEBS樹脂からなる摩擦体を組み合わせて固形筆記具セットを得た。
前記固形筆記具セットは、固形筆記体を用いて紙面上に筆記すると、鮮明な筆跡を形成することができ、重ね塗りによる濃淡形成も可能であった。また、付属の摩擦体を用いて筆跡を摩擦することにより残色を生じることなく消去できた。前記固形筆記具セットは筆記具と摩擦体がセットになっているため、筆記と消去が簡単にできるより利便性の高いものであった。
(熱変色性マイクロカプセルAの製造)
成分(a1)として1,3-ジメチル-6-ジエチルアミノフルオラン2.5質量部、成分(a2)として2,2-ビス(4‘―ヒドロキシフェニル)ヘキサフルオロプロパン5.0質量部、1,1-ビス(4’-ヒドロキシフェニル)n-デカン3.0質量部、成分(a3)としてカプリン酸-4-ベンジルオキシフェニルエチル(融点63℃)50.0質量部からなる色彩記憶性を有する可逆熱変色性組成物(成分(a))を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセルの平均粒子径は2.0μmであり、t1:-20℃、t2:-10℃、t3:45℃、t4:64℃、Δ(t4-t3):19℃のヒステリシス特性を有する挙動を示し、橙色から無色、無色から橙色へ可逆的に色変化した。
成分(a1)として3-(4-ジエチルアミノ-2-ヘキシルオキシフェニル)-3-(1-エチル-2-メチルインドール-3-イル)-4-アザフタリド2.0質量部、成分(a2)として1,1-ビス(4’-ヒドロキシフェニル)n-デカン8.0質量部、成分(a3)としてラウリン酸-4-ベンジルオキシフェニルエチル(融点70℃)50.0質量部からなる色彩記憶性を有する可逆熱変色性組成物を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセルの平均粒子径は4.0μmであり、t1:-2℃、t2:6℃、t3:56℃、t4:70℃、Δ(t4-t3):14℃のヒステリシス特性を有する挙動を示し、青色から無色、無色から青色へ可逆的に色変化した。
成分(a1)として3-(4-ジエチルアミノ-2-ヘキシルオキシフェニル)-3-(1-エチル-2-メチルインドール-3-イル)-4-アザフタリド2.0質量部、成分(a2)として1,1-ビス(4‘―ヒドロキシフェニル)ヘキサフルオロプロパン4.0質量部、1,1-ビス(4’-ヒドロキシフェニル)n-デカン4.0質量部、成分(a3)としてカプリル酸-4-ベンジルオキシフェニルエチル(融点57℃)50.0質量部からなる色彩記憶性を有する可逆熱変色性組成物を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセル顔料の平均粒子径は3.0μmであり、t1:-24℃、t2:-10℃、t3:42℃、t4:55℃、Δ(t4-t3):13℃のヒステリシス特性を有する挙動を示し、青色から無色、無色から青色へ可逆的に色変化した。
ミリスチルアルコール(融点40℃)10質量部を加温溶解し、5%メチルビニルエーテル無水マレイン酸共重合体水溶液中で乳化分散した。加温しながら攪拌を続けた後、35%メラミン-ホルムアルデヒド初期縮合物20質量部を徐々に滴下し、更に攪拌を続けて吸熱性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して吸熱性マイクロカプセルを単離した。なお、前記吸熱性マイクロカプセルの吸熱ピークは42.6℃を示し、平均粒径は5.0μmであった。
本発明に用いる吸熱性マイクロカプセルb~kのマイクロカプセルの壁膜、マイクロカプセルに内包する(ニ)成分、吸熱性マイクロカプセルの平均粒子径を表3に示す通りに準備した。
(可逆熱変色性組成物の作製)
熱変色性マイクロカプセルA 18質量部
ミリスチルアルコール(吸熱相変化化合物) 20質量部
イオン交換水 32質量部
上記配合物をマグネットスターラーで攪拌して均一になるまで混合した。得られた混合物を室温にて乾燥することにより、可逆熱変色性組成物201を得た。
熱変色性マイクロカプセルAとミリスチルアルコールの代わりに表4に示した熱変色性マイクロカプセルと吸熱性マイクロカプセルを用いた以外は、実施例201と同じ方法で可逆熱変色性組成物を得た。
前記実施例201で得られた可逆熱変色性組成物の熱色挙動を確認するために、以下の通り試料を作製した。
実施例201で得られた可逆熱変色性組成物 38質量部
エチレン-酢酸ビニルエマルジョン
(スミカフレックス500 住化ケムテックス社製) 3質量部
イオン交換水 30質量部
上記配合物をマグネットスターラーで攪拌して均一になるまで混合した。得られた混合物をスクリーン印刷により上質紙に所定の大きさの円を印刷し、室温にて乾燥することにより、変色挙動確認用試料を得た。
前記実施例202~211および比較例201~203で得られた可逆熱変色性組成物とした以外は、変色挙動確認用試料の作製と同じ方法で変色挙動確認用試料を得た。
前記試料を以下の方法で加熱、冷却して変色挙動を確認した。
前記試料を色差計[TC-3600型色差計(商品名、東京電色株式会社製)]の所定箇所にセットし、0~100℃の温度域で10℃/分の速度で加熱及び冷却して各温度における色濃度を測定した。各試料の消色開始温度t3、完全消色温度t4、完全消色温度と消色開始温度の温度差Δ(t4-t3)の測定結果は、表4に示す通りであった。
(筆記用インキ組成物の作製)
熱変色性マイクロカプセルA 18質量部
熱吸収性マイクロカプセルa 20質量部
尿素 10質量部
グリセリン 10質量部
リン酸エステル系界面活性剤 0.5質量部
ノニオン系浸透性付与剤 0.6質量部
変性シリコーン系消泡剤 0.1質量部
防腐・防黴剤 0.1質量部
トリエタノールアミン 0.5質量部
イオン交換水 39.9質量部
上記配合をマグネットホットスターラーで加温撹拌してベースインキを作製した。
その後、上記作製したベースインキを加温しながら、サクシノグリカン(剪断減粘性付与剤)0.3質量部を投入して、ホモジナイザー撹拌機を用いて均一な状態となるまで十分に混合撹拌した後、濾紙を用い濾過を行って、筆記用インキ組成物を得た。
(筆記用インキ組成物の作製)
熱変色性マイクロカプセルC 18質量部
熱吸収性マイクロカプセルc 20質量部
糖混合物 3質量部
リン酸エステル系界面活性剤 0.5質量部
防腐・防黴剤 0.1質量部
トリエタノールアミン 0.5質量部
イオン交換水 57.1質量部
上記配合をマグネットホットスターラーで加温撹拌してベースインキを作製した。
その後、上記作製したベースインキを加温しながら、サクシノグリカン(剪断減粘性付与剤)0.3質量部を投入して、ホモジナイザー撹拌機を用いて均一な状態となるまで十分に混合撹拌した後、濾紙を用い濾過を行って、筆記用インキ組成物を得た。
(筆記用インキ組成物の作製)
熱変色性マイクロカプセルB 18質量部
熱吸収性マイクロカプセルb 20質量部
ヒドロキシエチルセルロース 0.5質量部
グリセリン 18質量部
10%-りん酸水溶液 0.1質量部
変性シリコーン系消泡剤 0.02質量部
防腐・防黴剤 1.5質量部
イオン交換水 41.88質量部
上記配合をマグネットホットスターラーで加温撹拌して均一な状態となるまで十分に混合撹拌した後、濾紙を用い濾過を行って、筆記用インキ組成物を得た。
表5に示した配合とした以外は実施例212と同じ方法で筆記用インキ組成物を得た。
直径0.7mmのボールを抱持したステンレススチール製のボールペンチップを樹脂製のチップホルダーを介してポリプロピレン製インキ収容筒の一端に嵌着し、内部に押圧バネを配置したボールペンレフィルに実施例212および比較例204の筆記用インキ組成物を充填し、さらに、ボールペンチップと反対側のインキ組成物に接するように、グリース状のインキ逆流防止体を配設して、遠心処理を施し、ボールペンレフィルを作製した。前記ボールペンレフィルを筆記具の軸筒(先軸筒と後軸筒からなる)に組み込み、ゴムシールを内在したキャップを嵌め、所謂キャップ式ボールペン形態とした。なお、前記後軸筒には、SEBS樹脂製の摩擦部材を設けた。
直径0.7mmのボールを抱持したステンレススチール製のボールペンチップを樹脂製のチップホルダーを介してポリプロピレン製インキ収容筒の一端に嵌着し、内部に押圧バネを配置したボールペンレフィルに実施例213および比較例205の筆記用インキ組成物を充填し、さらに、ボールペンチップと反対側のインキ組成物に接するように、グリース状のインキ逆流防止体を配設して、遠心処理を施し、ボールペンレフィルを作製した。前記ボールペンレフィルを筆記具の軸筒に組み込み、出没式のボールペンボールペン形態とした。なお、前記軸筒先端開口部の周囲には、SEBS樹脂製の摩擦部材を設けた。
ポリエステルスライバーを合成樹脂フィルムで被覆したインキ吸蔵体に実施例14および比較例206、207の筆記用インキ組成物を含浸し、ポリプロピレン樹脂からなる軸筒内に収容し、接続部材を介して軸筒先端部にポリエステル繊維からなるマーキングペンチップを接続するように組み立て、ゴムシールを内在したキャップを嵌め、所謂キャップ式マーキングペン形態とした。なお、前記キャップには、SEBS樹脂製の摩擦部材を設けた。
A :筆跡が十分に濃く視認性に優れる 。
B :筆跡がやや薄いが、視認可能。
C :筆跡が薄く、視認できない。
消去性:筆記性を評価した筆跡を、作製した筆記具それぞれの摩擦部材を用いて擦過し、その時の消去性を目視により評価した。
A :筆跡が十分に消去され、残像が見られない。
B :筆跡が消去されているが残像がわずかに見られる。
C :筆跡の残像が見られる。
D :筆跡が消去できない。
A :筆跡が消去されておらず、十分に視認可能。
B :筆跡が一部消去され薄くなっているが、視認可能。
C :筆跡が消去され、視認できない。
熱変色性マイクロカプセルA 18質量部
熱吸収性マイクロカプセルa 20質量部
ポリエチレンワックス 62質量部
上記配合物をニーダーにて混練し、得られた混練物をプレスにて圧縮成形を行い、外径φ3mm、長さ60mmの固形筆記体を得た。
表6に示した配合とした以外は実施例215と同じ方法で固形筆記体を得た。
A :書き味が滑らかであり良好。
B :書き味が滑らかであるが、やや硬い。
C :書き味が硬い。
筆記性:固形筆記体を用いて、筆記用紙Aに筆記し、その時の筆跡濃度を目視により評価した。
A :筆跡が十分に濃く視認性に優れる 。
B :筆跡に消色が生じてやや薄いが、視認可能。
C :筆跡に消色が生じて薄く、視認できない。
消去性:筆記性を評価した筆跡を、SEBS製の摩擦部材を用いて擦過し、その時の消去性を目視により評価した。
A :筆跡が十分に消去され、残像が見られない。
B :筆跡が消去されているが残像がわずかに見られる。
C :筆跡の残像が見られる。
D :筆跡が消去できない。
成分(a1)として4,5,6,7-テトラクロロ-3-〔4-(ジエチルアミノ)-2-メチルフェニル〕-3-〔1-エチル-2-メチル-1H-インドール-3-イル〕-1(3H)-イソベンゾフラノン1.5部、成分(a2)として2,2-ビス(4’-ヒドロキシフェニル)ヘキサフルオロプロパン5.0部、4,4’-(2-メチルプロピリデン)ビスフェノール3.0部、成分(a3)としてカプリン酸-4-ベンジルオキシフェニルエチル(融点63℃)50.0質量部からなる色彩記憶性を有する可逆熱変色性組成物を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。 前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセルの平均粒子径は2.2.5μmであり、t’1:-16℃、t’2:-8℃、t’3:48℃、t’4:58℃、ΔH:65℃、Δ(t’4-t’3):10℃、可逆熱変色性組成物:壁膜=2.6:1.0のヒステリシス特性を有する挙動を示し、青色から無色、無色から青色へ可逆的に色変化した。
成分(a1)として2-(ジブチルアミノ)-8-(ジペンチルアミノ)-4-メチル-スピロ[5H-[1]ベンゾピラノ[2,3-g]ピリミジン-5,1’(3’H)-イソベンゾフラン]-3-オン1.0部、成分(a2)として4,4’-(2-エチルヘキサン-1、1-ジイル)ジフェノール3.0部、2,2-ビス(4’-ヒドロキシフェニル)-ヘキサフルオロプロパン5.0部、成分(a3)としてカプリン酸-4-ベンジルオキシフェニルエチル(融点63℃)50.0質量部からなる色彩記憶性を有する可逆熱変色性組成物を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセルの平均粒子径は2.3μmであり、t’1:-20℃、t’2:-10℃、t’3:48℃、t’4:58℃、ΔH:68℃、Δ(t’4-t’3):10℃、可逆熱変色性組成物:壁膜=2.6:1.0のヒステリシス特性を有する挙動を示し、ピンク色から無色、無色からピンク色へ可逆的に色変化した。
成分(a1)として2-(2-クロロアニリノ)-6-ジ-n-ブチルアミノフルオラン5部、成分(a2)として2,2-ビス(4’-ヒドロキシフェニル)ヘキサフルオロプロパン5部、4,4’-(2-メチルプロピリデン)ビスフェノール3.0部、成分(a3)としてラウリン酸4-ベンジルオキシフェニルエチル(融点70℃)50部からなる色彩記憶性を有する可逆熱変色性組成物を加温溶解し、壁膜材料として芳香族イソシアネートプレポリマー30.0質量部、助溶剤40.0質量部を混合した溶液を、8%ポリビニルアルコール水溶液中で乳化分散し、加温しながら攪拌を続けた後、水溶性脂肪族変性アミン2.5質量部を加え、更に攪拌を続けて熱変色性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して熱変色性マイクロカプセルを単離した。なお、前記マイクロカプセル顔料の平均粒子径は3.0μmであり、t’1:-8℃、t’2:-1℃、t’3:52℃、t’4:65℃、ΔH:63℃、Δ(t4-t3):13℃、可逆熱変色性組成物:壁膜=2.6:1.0のヒステリシス特性を有する挙動を示し、黒色から無色、無色から黒色へ可逆的に色変化した。
ミリスチルアルコール(融点40℃)10質量部を加温溶解し、5%メチルビニルエーテル無水マレイン酸共重合体水溶液中で乳化分散した。加温しながら攪拌を続けた後、35%メラミン-ホルムアルデヒド初期縮合物20質量部を徐々に滴下し、更に攪拌を続けて吸熱性マイクロカプセル懸濁液を得た。前記懸濁液を遠心分離して吸熱性マイクロカプセルを単離した。なお、前記吸熱性マイクロカプセルの吸熱ピークは42.6℃を示し、平均粒径は5.0μmであった。
マイクロカプセル顔料D 30質量部
熱吸収性マイクロカプセルm 25質量部
ポリオレフィンワックスI 12.5質量部
(三洋化成工業株式会社製 サンワックス131-P(商品名)
軟化点110℃ 針入度3.5)
ショ糖脂肪酸エステルi 8質量部
(三菱化学フーズ株式会社製 リョートーシュガーエステルP-170(商品名))
ヒンダードアミン(BASF社製 TINUVIN765 (商品名)) 1.5質量部
ポリビニルアルコール 2質量部
木蝋 0.6質量部
タルク(体質材) 20.4質量部
上記配合物をニーダーにて混練し、得られた混練物をプレスにて圧縮成形を行い、外径φ3mm、長さ60mmの固形筆記体を得た。
表8に示した配合とした以外は実施例1と同じ方法で固形筆記体を得た。
表8に示した配合とした以外は実施例1と同じ方法で固形筆記体を得た。
(注2)BAKER HUGHES社製、商品名:VYBAR103POLYMER(軟化点70℃、針入度5.5)
(注3)三菱化学フーズ株式会社製、商品名:リョートーシュガーエステルP-170
(注4)三菱化学フーズ株式会社製、商品名:リョートーシュガーエステルS-370
(注5)千葉製粉株式会社製、商品名:レオパールMKL
(注6)BASF社製、商品名:TINUVIN765
A :書き味が滑らかであり良好。
B :書き味がやや滑らかである。
C :書き味が滑らかさに欠ける。
筆跡視認性:固形筆記体を用いて、筆記用紙Aに筆記し、その時の筆跡濃度を目視により評価した。
B :筆跡に消色が生じてやや薄いが、視認可能。
C :筆跡に消色が生じて薄く、視認できない。
筆跡消去性:筆跡視認性を評価した筆跡を、SEBS製の摩擦部材を用いて擦過し、その時の消去性を目視により評価した。
A :筆跡が容易に消去され、残像が見られない。
B :筆跡が消去されているが残像がわずかに見られる。
C :筆跡の残像が見られる。筆跡が紙面上に伸びて汚れを生じる。
D :筆跡が消去できない。
A :濃淡形成ができ、筆跡の視認性に優れる。
B :筆跡の視認性に優れるが、濃淡形成が充分ではなく、筆跡が部分的に消去される。
C :筆跡が薄く視認し難く、濃淡形成ができず部分的に消去される。
A :筆跡が消去されておらず、十分に視認可能。
B :筆跡が一部消去され薄くなっているが、視認可能。
C :筆跡が消去され、視認できない。
t2 加熱消色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の発色開始温度
t3 加熱消色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の消色開始温度
t4 加熱消色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の完全消色温度
T1 加熱発色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の完全消色温度
T2 加熱発色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の消色開始温度
T3 加熱発色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の発色開始温度
T4 加熱発色型の可逆熱変色性組成物を内包したマイクロカプセル顔料の完全発色温度
ΔH ヒステリシス幅
t’1 従来の加熱消色型の固形筆記体の筆跡の完全発色温度
t’2 従来の加熱消色型の固形筆記体の筆跡の発色開始温度
t’3 従来の加熱消色型の固形筆記体の筆跡の消色開始温度
t’4 従来の加熱消色型の固形筆記体の筆跡の完全消色温度
Claims (14)
- (a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体と、
を含んでなる可逆熱変色性成分(a)、および
(b)前記可逆熱変色性成分に伝達される熱量を制御する成分
の組み合わせを含んでなることを特徴とする可逆熱変色性組成物。 - 前記可逆熱変色性成分(a)が、マイクロカプセルに内包されている、請求項1に記載の可逆熱変色性組成物。
- 成分(b)が、(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物である、請求項1または2に記載の可逆熱変色性組成物。
- 請求項1~3の可逆熱変色性組成物と、(c)ポリオレフィンワックスとを含んでなることを特徴とする、固形筆記体。
- 前記ポリオレフィンワックスの軟化点が100℃~130℃の範囲にあるとともに、針入度が10以下である、請求項4記載の固形筆記体。
- 前記ポリオレフィンワックスが酸変性ポリエチレンワックスである、請求項5記載の固形筆記体。
- 成分(b)が、(bii)前記可逆熱変色性成分と常に非相溶の状態で存在し、かつその融点が、成分(a3)の融点より低い吸熱相変化化合物であり、
前記可逆熱変色性組成物は、第1の発色状態と第2の発色状態を互変的に呈し、各発色状態の保持温度域が共に一定の温度域にあり、第1の発色状態にあって、温度が上昇する過程では温度t3に達すると第1の発色状態から変色し始め、温度t3より高い温度t4以上の温度域で、完全に第2の発色状態となり、第2の発色状態にあって温度が下降する過程では、前記t3より低い温度t2に達すると第2の発色状態から変色し始め、t2よりも低い温度t1以下の温度域で完全に第1の発色状態となり、温度t2と温度t3の間の温度域で第1の発色状態と第2の発色状態が選択的に保持されるヒステリシス特性を示す、請求項1または2に記載の可逆熱変色性組成物。 - 前記(bii)成分が、マイクロカプセルに内包されている、請求項7に記載の可逆熱変色性組成物。
- 請求項7または8に記載の可逆熱変色性組成物と分散媒とを含むことを特徴とする筆記用インキ組成物。
- 請求項7または8に記載の可逆熱変色性組成物と賦形材とを含むことを特徴とする固形筆記体。
- 前記成分(b)が、(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物と、(bii)前記可逆熱変色性成分と常に非相溶の状態で存在し、かつその融点が、成分(a3)の融点より低い吸熱相変化化合物との組み合わせである、請求項1または2に記載の可逆熱変色性組成物。
- 前記(bii)成分が、マイクロカプセルに内包されている、請求項11に記載の可逆熱変色性組成物。
- (a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体と
を含んでなる可逆熱変色性成分(a)を内包した可逆熱変色性マイクロカプセル顔料と、
(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物と、
(c)ポリオレフィンワックスと、
を含んでなることを特徴とする固形筆記体。 - (a1)電子供与性呈色性有機化合物と、
(a2)電子受容性化合物と、
(a3)前記(a1)成分および(a2)成分による電子授受反応を特定温度域において可逆的に生起させる反応媒体とからなる可逆熱変色性成分(a)を内包した可逆熱変色性マイクロカプセル顔料と、
(bi)ショ糖脂肪酸エステルおよびデキストリン脂肪酸エステルからなる群から選択されるエステル化合物と、
(bii)前記可逆熱変色性成分(a)と常に非相溶の状態で存在し、かつその融点が、成分(a3)の融点より低い吸熱相変化化合物と
(c)ポリオレフィンワックスと、
を含んでなることを特徴とする固形筆記体。
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Also Published As
Publication number | Publication date |
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EP2772523B1 (en) | 2018-11-28 |
EP2772523A1 (en) | 2014-09-03 |
JP6328816B2 (ja) | 2018-05-23 |
US20140291585A1 (en) | 2014-10-02 |
JPWO2013061814A1 (ja) | 2015-04-02 |
CN103998569A (zh) | 2014-08-20 |
TW201336980A (zh) | 2013-09-16 |
TWI624539B (zh) | 2018-05-21 |
JP6117701B2 (ja) | 2017-04-19 |
EP2772523A4 (en) | 2015-07-08 |
JP2017165968A (ja) | 2017-09-21 |
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