Fluororesin and silica composition
AssigneeDuPont-Mitsui Fluorochemicals Co., Ltd.
InventorHOAI-NAM PHAM
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Abstract
Provide are fluororesin and silica compositions having a low coefficient of thermal expansion. The fluororesin compositions include 20 to 70 wt % of a melt-processible fluororesin and 80 to 30 wt % of silica particles. The silica particles are constituted by leafy silica secondary particles formed as a result of a parallel overlap of a plurality of scaly silica primary particles, or flower petal-shaped tertiary particles formed as a result of the aggregation of the leafy silica secondary particles, or mixtures thereof. The thickness of the scaly silica primary particle is 0.001 to 0.1 μm, the thickness of the leafy silica secondary particles is 0.001 to 3 μm, and the ratio of the length of the leafy silica secondary particle with respect to their thickness is 2 to 300.
Claims8
A fluororesin composition comprising 20 to 70 weight percent of a melt processible fluororesin and 80 to 30 weight percent of silica particles, wherein said silica particles comprise leafy silica secondary particles formed from a plurality of scaly silica primary particles overlapping in parallel, or flower petal-shaped silica tertiary particles formed from aggregates of said leafy silica secondary particles, or mixtures thereof, wherein the thickness of said scaly silica primary particles is 0.001 to 0.1 μm, the thickness of said leafy silica secondary particles is 0.001 to 3 μm, and the ratio of the length of said leafy silica secondary particles with respect to their thickness is 2 to 300.
Dependencies are inferred from the claim text.