Pencil lead

A pencil lead and core body technology, applied in pencil lead, non-moving pencil, printing and other directions, can solve the problems of low bending strength and easy breakage of pencil lead

Active Publication Date: 2021-03-16
PENTEL KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, by making the core body soft due to high abrasion, it is possible to make a core body with a high concentration of writing lines, but in general, a soft pencil lead has low bending strength, causing another problem that it is easy to break when writing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The impregnated component (K-PON 402, the compound (n=2) represented by the above-mentioned general formula (chemical formula 1) and the dehydration condensate of ricinoleic acid, heated at 120°C for the above-mentioned fired core body A, Ogura Sesei Kogyo ( Co., Ltd., IOB value = 0.45, viscosity 520mPa·s) after immersion for 16 hours, the excess impregnated components on the surface were removed by a centrifuge, thereby obtaining a pencil lead. The impregnation rate of the impregnation component was 16.5% by weight.

Embodiment 2

[0043] In addition to changing the impregnation component of Example 1 to K-PON 402, using K-PON 404-S (the compound (n=4) represented by the above general formula (chemical formula 1), a dehydration condensate of ricinoleic acid, Ogura Synthetic Industrial Co., Ltd., IOB value = 0.31, viscosity 1068mPa·s), except that it was carried out in the same manner as in Example 1 to obtain a pencil lead. The impregnation rate of the impregnation component was 16.7% by weight.

Embodiment 3

[0045] In addition to changing the impregnation component of Example 1 to K-PON 402, using K-PON 406-S (the compound (n=6) represented by the above general formula (chemical formula 1), a dehydration condensate of ricinoleic acid, Ogura Synthetic Industrial Co., Ltd., IOB value = 0.27, viscosity 1589mPa·s), except that it was carried out in the same manner as in Example 1 to obtain a pencil lead. The impregnation rate of the impregnation component was 16.2% by weight.

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Abstract

According to the present invention, a lead body which contains at least a coloring component and an organic binder is subjected to a heat treatment; and subsequently, pores of the thus-obtained bakedlead body are impregnated with a compound that is represented by general formula (chemical formula 1).

Description

technical field [0001] The present disclosure relates to a pencil lead having an impregnated component in pores of a fired core obtained by heat treatment containing at least a coloring component and an organic binder. Background technique [0002] Generally speaking, pencil cores use graphite, boron nitride and other coloring components, and talc and other extenders (volume material), with chlorinated vinyl resin, vinylidene chloride resin, vinyl acetate resin, chlorinated vinyl resin, vinyl alcohol resin, acrylic amide resin, chlorinated paraffin, phenol resin, furan resin, urea resin, carboxymethyl cellulose , nitrocellulose, butyl rubber and other organic binders, or clay and other inorganic binders as the main material, and as needed, plasticizers such as phthalates, methyl ethyl ketone, acetone, water Solvents such as stearate, stabilizers such as stearate, lubricants such as stearic acid, fillers (fillers) such as carbon black, etc., after these raw materials are di...

Claims

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Application Information

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IPC IPC(8): C09D13/00B43K19/02
CPCB43K19/02C09D13/00B43K19/16Y02E60/10
Inventor 三浦隆博
Owner PENTEL KK
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