Crayon Formulation Using Alternative Plasticizers
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Solution Overview
Problem
Conventional crayons using phthalate ester plasticizers are toxic and regulated, necessitating the development of alternative plasticizers that maintain water resistance and writing quality.
Innovation Solution
A crayon formulation incorporating diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, or alkylsulfonic acid phenyl ester as alternative plasticizers, in combination with a colorant, gelling agent, organic solvent, and resin component, to achieve improved water resistance and writing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional phthalate ester plasticizers are used in crayons, then the crayon achieves suitable hardness and good writing feel, but the plasticizer becomes toxic and subject to regulation
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by substituting phthalate esters with alternative plasticizers having different molecular structures (non-phthalate esters). This parameter change maintains the desired writing feel and hardness while eliminating the toxic properties associated with conventional phthalate esters, thus resolving the contradiction between ease of operation and harmful factors.
2Object-affected harmful factors
If alternative plasticizers are used to replace phthalate esters, then toxicity is reduced, but water resistance of writings deteriorates
Solution Approach 1:
The patent employs composite material principles by formulating a multi-component crayon system that includes alternative plasticizers combined with specific resins, gelling agents, and organic solvents. This composite formulation synergistically maintains water resistance while using non-toxic alternative plasticizers, thus resolving the contradiction between reduced harmful factors and maintained reliability.
Solution Approach 2:
The patent adjusts the chemical and physical parameters of the alternative plasticizers and their concentrations within optimized ranges to achieve the desired balance between safety and water resistance. By carefully controlling parameters such as plasticizer molecular weight, hydrophobicity, and concentration, the patent maintains writing water resistance while using non-toxic alternatives.
3Object-affected harmful factors
If alternative plasticizers are used instead of phthalate esters, then safety is improved, but maintaining both hardness and water resistance becomes difficult
Solution Approach 1:
The patent uses composite material formulation combining alternative plasticizers with specifically selected resins, gelling agents, and organic solvents to achieve the desired crayon properties. This composite approach simplifies the overall formulation by creating synergistic interactions between components, making it easier to maintain both hardness and water resistance while using safer alternative plasticizers.
Data Source
AI summary
The invention provides a crayon which comprises an alternative plasticizer in place of the conventional phthalate ester plasticizers and yet provides writings excellent in water resistance, the crayon comprising a colorant, a gelling agent, an organic solvent, a resin component, and a plasticizer, wherein the plasticizer is at least one selected from diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, and alkylsulfonic acid phenyl ester and is contained in an amount of 1 to 20% by weight based on the crayon.