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Solid writing material

A writing and solid technology, which is applied to writing utensils, printing, pencil leads, etc., can solve the problems of not considering the use of reversible thermochromic composition and not including solid writing, so as to avoid defects in appearance and improve Moldability and the effect of less defects

Inactive Publication Date: 2015-12-09
PILOT PEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the above-mentioned patent documents, there is no consideration of the use of reversible thermochromic compositions for solid writing materials, and therefore there is no suggestion related to the problems specific to these solid writing materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 101

[0180] (manufacture of writable core kneading)

[0181]

[0182] The above compound was kneaded with a kneader to obtain a kneaded product of a writable inner core.

[0183] (manufacture of kneaded product of shell)

[0184]

[0185] The above compound was kneaded with a kneader to obtain a kneaded product of the shell.

[0186] (production of solid writing)

[0187] On the outer peripheral surface of the kneaded material of the obtained writable inner core, wrap the kneaded material of the outer shell, utilize a press to carry out compression molding, and mold it into an outer diameter of φ3mm and a length of 60mm (the writable inner core is φ2mm, and the outer diameter of the outer shell is φ2mm). The covering thickness was 0.5 mm), and a solid writing body provided with a shell covering the outer peripheral surface of the writable inner core was obtained.

Embodiment 102～118

[0189] With the combination shown in (Table 1), a solid writing body was obtained by the same method as in Example 101.

Embodiment 201～219、 comparative example 201～203

[0232] The raw materials were blended in the ratios shown in Tables 2-1 and 2-2, and the same method as in Example 101 was used to obtain the solid writing materials of Examples 201-219 and Comparative Examples 201-203.

[0233] Using the solid writing materials obtained in Examples 201 to 219 and Comparative Examples 201 to 203, the affinity, impact resistance, formability and bending strength of the solid writing materials were evaluated by the following methods. The obtained results are shown in Tables 2-1 and 2-2.

[0234] (1) Affinity: visually observe the solid writing body, further apply torsional stress to the solid writing body, and observe the degree of damage to evaluate the affinity between the shell and the inner core.

[0235] A: Cracks and latent cracks were not confirmed, and the affinity was very good.

[0236] B: Potential cracks were slightly confirmed, but affinity was good.

[0237] C: Potential cracks were slightly confirmed, but the affinity was at a pra...

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Abstract

The present invention addresses the problem of providing a solid writing material which exhibits excellent colour-change properties or erasability, and excellent light-exposure properties, mouldability, and strength. This solid writing material is characterized by being provided with: a writable inner core; and an outer shell which covers an outer peripheral surface of the inner core. The inner core includes: an excipient; and a reversible thermochromatic microcapsule pigment including a temperature-sensitive colour-changeable colour-memorizing composition which comprises at least (a) an electron-donating colour-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium which reversibly induces, in a specific temperature range, an electron exchange reaction using components (a) and (b). The solid writing material is further characterized in that a filler is included in the outer shell.

Description

technical field [0001] The present invention relates to solid writing. More specifically, it relates to a solid writing material capable of forming reversible thermochromic handwriting. Background technique [0002] Conventionally, there have been proposed solid writing materials using a reversible thermochromic composition that can memorize and retain the state before and after discoloration in a constant temperature range such as a normal temperature range. [0003] The above-mentioned solid writing material forms handwriting that changes color according to temperature changes by using a single reversible thermochromic composition or its microcapsule encapsulated substance as a coloring agent added to wax as an excipient. In particular, in the case of using a microcapsule pigment enclosing a reversible thermochromic composition of a heat-erasable type, handwriting can be easily erased by frictional heat, so it becomes possible to correct misprints, etc., with high conveni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00B43K19/00
CPCB43K19/18B43K19/16C09D13/00B43K19/00B43K29/02
Inventor 户冢太郎
Owner PILOT PEN CO LTD
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