Polyamide Particle Synthesis Using Silica Fillers
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Solution Overview
Problem
Existing methods fail to reproducibly produce polyamide or copolyesteramide particles with a mean diameter greater than 40 μm, especially greater than 60 μm, due to limitations in stirring speed and filler amount, which affects particle size distribution and purity in anionic polymerization processes.
Innovation Solution
Introducing an inorganic filler with a mean diameter between 1 and 30 μm, preferably between 2 and 20 μm, into the polymerization medium to control particle size and reduce impurity effects, ensuring polyamide or copolyesteramide particles with a mean diameter of 40 to 150 μm and a narrow size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the stirring speed is reduced or the amount of filler is reduced to increase particle diameter, then the particle size can be increased, but the reaction medium homogeneity deteriorates or impurities increase
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for filler particle size (1-30 μm, preferably 2-20 μm, advantageously 3-11 μm, more advantageously 4-8 μm) and filler content (0.1-10% by weight, preferably 0.5-5% by weight). These controlled parameter variations enable the resolution of the contradiction between increasing particle diameter and maintaining reaction medium homogeneity, allowing the production of polyamide particles with mean diameters of 40-150 μm while preserving mixture uniformity.
2Volume of moving object
If the stirring speed is reduced excessively to increase particle diameter, then larger particles can be formed, but the reaction medium homogeneity deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the filler particle size parameter within specific ranges (1-30 μm, preferably 2-20 μm). This parameter change allows the system to achieve larger polyamide particles (40-150 μm) without requiring excessive reduction in stirring speed, thereby maintaining reaction medium homogeneity and ease of operation.
3Volume of moving object
If the amount of filler is reduced to increase particle diameter, then larger particles can be formed, but impurities act as disrupting seeds in excessive amounts
Solution Approach 1:
The patent applies parameter changes by optimizing the filler content within specific ranges (0.1-10% by weight, preferably 0.5-5% by weight). This controlled reduction in filler amount, combined with optimization of filler particle size (1-30 μm), enables the formation of larger particles (40-150 μm) while minimizing the presence of impurities that would act as disrupting seeds, thus resolving the contradiction between particle size and impurity disruption.
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
This approach allows for the production of polyamide or copolyesteramide particles with a controlled mean diameter of 40 to 150 μm and a narrow size distribution, enhancing their applicability in coatings, inks, cosmetics, and pharmaceutical formulations while minimizing impurities and ensuring reaction medium homogeneity.
Implementation Method 1
the filler which is added acts as crystallization seeds
Implementation Method 2
anionic polymerization of lactam(s) in suspension (FR 1 213 993, FR 1 602 751) or in solution (DE 1 183 680) in an organic liquid
Data Source
AI summary
The invention relates to a method for obtaining polyamide or copolyamide particles which are spheroidal and whose average diameter is between 40 and 150 μm, preferably between 60 and 100 μm. Said method consists of introducing a mineral charge, preferably silica, having an average diameter of 1-30 μm into the reaction mixture. The invention also relates to a polyamide or copolyester amide powder and to the use thereof in order to manufacture coatings, ink compositions, paint compositions, cosmetic compositions, pharmaceutical compositions, alloys with metal powders or metal oxide powders and parts by agglomerating said powder by laser sintering, IR radiation or UV radiation.