Solid Drawing Material With Dibasic Acid Resin
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Solution Overview
Problem
Conventional solid and water-soluble drawing materials face challenges in achieving high strength and smooth writing performance, particularly on smooth and non-absorbing surfaces like art paper, coated paper, plastics, metal, glass, and whiteboards, where they tend to slip and fail to draw dark, fine lines, and often have issues with erasability and solubility.
Innovation Solution
A solid drawing material comprising a resin, waxes, a pigment, and an extender, with the addition of specific dibasic acids and their derivatives, which enhance strength and writing performance, allowing for dark, fine, and detailed drawings on various surfaces, and can be easily erased or dissolved with water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the amount of liquid oil is increased for softening the drawing material, then the drawing material becomes softer and can draw on smooth surfaces, but the strength is reduced and the leads become liable to be broken
Solution Approach 1:
The patent changes the physical state parameter of the oil component by using microencapsulated oil instead of liquid oil. This transformation allows the oil to be incorporated in higher amounts for softening effect while maintaining lead strength through the encapsulated structure that prevents premature oil release and maintains structural integrity during molding and use.
Solution Approach 2:
The patent creates a composite structure by combining microencapsulated oil with the lead matrix. This composite approach allows the oil to provide softening and smooth writing properties while the microcapsule structure and lead matrix together maintain sufficient strength, resolving the contradiction between softness and strength.
2Strength
If the amount of resins is increased to enhance strength of the leads, then the leads become stronger and can be molded into fine leads, but the leads become hard and cannot be used for drawing on smooth and non-absorbing surfaces
Solution Approach 1:
The patent modifies the oil delivery mechanism by encapsulating it in microcapsules with controlled softening points. This allows the resin content to be optimized for strength while the microencapsulated oil releases at appropriate temperatures to provide smooth writing on various surfaces, decoupling the strength-providing function from the smoothness-providing function.
3Ease of manufacture
If organic solvent with low boiling point is used to improve coloring property, then the coloring property on smooth surface is improved, but an outer holder for preventing volatilization is required which reduces convenience in use
Solution Approach 1:
The patent extracts and removes the low-boiling-point organic solvent from the formulation entirely. Instead, it uses microencapsulated oil that provides the necessary coloring and softening properties without volatile components, eliminating the need for outer holders and improving convenience while maintaining manufacturing benefits.
4Ease of manufacture
If the content of low-melting point blending component or liquid oil is increased to draw dark lines, then the coloring intensity is improved, but the strength is reduced and practical strength cannot be maintained
Solution Approach 1:
The patent transforms the physical state and delivery mechanism of the oil component through microencapsulation. This allows higher oil content for dark coloring while the microcapsule structure maintains structural integrity and practical strength by controlling oil release and preventing premature softening during handling and use.
Data Source
AI summary
Provided is a solid drawing material which can draw smoothly, darkly and finely pictures not only on smooth and non-absorbing surfaces of art paper, coated paper, milk packs, plastics such as PET, metal, glass, white boards, and the like, but also on eyebrows, lips, skins and the like as well as ordinary papers such as wood free paper, drawing paper and copier paper and which can readily be erased by cloths, papers such as tissue paper, white board erasers, and the like when drawn on the non-absorbing surfaces described above. The solid drawing material includes a solid drawing material containing at least a resin, waxes, a pigment and an extender, wherein it further contains at least one selected from dibasic acids having 12 to 30 carbon atoms and derivatives thereof, and the resin is at least one selected from rosin and modified products thereof, terpene resins and modified products thereof, petroleum resins, maleic acid resins and derivatives thereof, coumarone•indene resins and derivatives thereof, and isoprene base resins.