Hollow Particle Shell Composition for Solvent-Resistant Void Ratio
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Solution Overview
Problem
Hollow particles with poor solvent resistance swell when used with solvents, reducing their void ratio and diminishing their effectiveness in applications such as molding resins.
Innovation Solution
Hollow particles with a shell formed from a shell polymer containing cross-linkable monomer units, achieving a true density of 1.16 g/cm³ or more and a C value of 0.94 or more, as calculated by Expression (1), with specific monomer unit compositions to enhance solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hollow particles are used with solvents, then the particles can be processed in solvent-based formulations, but the particles swell and their void ratio reduces
Solution Approach 1:
The patent changes the chemical composition parameters of the shell polymer by specifying precise proportions of cross-linkable monomer units (80-95 mass%) and monofunctional monomer units (5-20 mass%), along with controlling the true density (1.16-1.30 g/cm³) and C value (0.94-1.20). These parameter changes create a shell structure that resists solvent penetration and swelling, maintaining the hollow particles' void ratio while allowing use in solvent-based formulations.
2Reliability
If hollow particles are used to reduce weight and dielectric loss, then the effects are sufficient, but the particles swell in solvents reducing their effectiveness
Solution Approach 1:
The patent creates a composite shell structure combining cross-linkable monomer units (providing solvent resistance through cross-linking) with monofunctional monomer units (providing appropriate density and processing characteristics). This composite material approach produces a shell that maintains the hollow particles' effectiveness in molding resins while resisting solvent-induced swelling.
3Ease of manufacture
If the shell contains aromatic polymer, then the particles can be produced by polymerization, but the solvent resistance is poor
Solution Approach 1:
The patent changes the monomer composition parameters by requiring 80-95 mass% cross-linkable monomer units with specific functional groups (acrylate, methacrylate, styrene, vinyl) that form cross-linked networks. This parameter change maintains polymerization processability while dramatically improving solvent resistance through the cross-linked structure that prevents solvent penetration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The particles exhibit high solvent resistance, maintaining their void ratio and mechanical strength even when exposed to solvents like toluene, methyl ethyl ketone, and acetone.
Implementation Method 1
the resin is constituted by a shell polymer containing a cross-linkable monomer unit
Data Source
AI summary
Provided are hollow particles each comprising a shell containing a resin and a hollow portion surrounded by the shell, wherein the resin is constituted by a shell polymer containing a cross-linkable monomer unit, the hollow particles have a true density of 1.16 g/cm3 or more, and C of the hollow particles calculated from Expression (1) below has a value of 0.94 or more. Expression (1): C=A×(100−B)/100 (where A represents the value (unit: g/cm3) of the true density of the hollow particles, and B represents the value (unit: mass %) of the proportion of a monofunctional monomer unit contained in the shell polymer).