Patent ID: 11939449
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A liquid crystal polyester composition, comprising:
a liquid crystal polyester; and
a plate-like inorganic filler,
wherein:
the plate-like inorganic filler is mica,
a ratio (D50/D50*) of median diameters of the plate-like inorganic filler is 3.0 to 6.0, and a particle size D90 of the plate-like inorganic filler is equal to or smaller than 70 μm,
the D50 is a median diameter of the plate-like inorganic filler measured by a laser diffraction method, wherein the plate-like inorganic filler is dispersed in water to prepare an aqueous dispersion, a volume-based particle size distribution of the aqueous dispersion is measured in accordance with JIS R 1629 using a laser diffraction type particle size distribution measuring device, and then the D50 is calculated from a particle size value of 50% of a cumulative amount read from a cumulative particle size distribution curve based on a measurement of the particle size distribution,
the D50* is a median diameter of the plate-like inorganic filler measured by a centrifugal sedimentation method, wherein the plate-like inorganic filler is dispersed in water to prepare an aqueous dispersion, a mass-based particle size distribution of the aqueous dispersion is measured in accordance with JIS R 1619 using a centrifugal sedimentation type particle size distribution measuring device, and then the D50* is calculated from a particle size value of 50% of a cumulative amount read from a cumulative particle size distribution curve based on a measurement of the particle size distribution, and
the D90 is a particle size value of 90% of a cumulative amount obtained from a volume-based cumulative particle size distribution curve of the plate-like inorganic filler measured by a laser diffraction method, wherein the plate-like inorganic filler is dispersed in water to prepare an aqueous dispersion, a volume-based particle size distribution of the aqueous dispersion is measured in accordance with JIS R 1629 using a laser diffraction type particle size distribution measuring device, and then the D90 is calculated from a particle size value of 90% of a cumulative amount from a fine particle side read from a cumulative particle size distribution curve based on a measurement of the particle size distribution.