Scaly silica particles and hardenable composition containing them
First Claim
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1. Scaly silica particles having a laminated structure, consisting essentially of:
- secondary particles of foliar silica;
wherein each of said secondary particles is formed by a plurality of primary particles of scaly silica which are overlaid one on another and aligned face-to-face in parallel with one another; and
wherein said secondary particles are present independent of one another.
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Abstract
Scaly silica particles having a laminated structure, consisting essentially of secondary particles of foliar silica, each formed by a plurality of flaky primary particles of scaly silica which are overlaid one on another and aligned face-to-face in parallel with one another, said secondary particles being present independent of one another.
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Citations
18 Claims
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1. Scaly silica particles having a laminated structure, consisting essentially of:
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secondary particles of foliar silica;
wherein each of said secondary particles is formed by a plurality of primary particles of scaly silica which are overlaid one on another and aligned face-to-face in parallel with one another; and
wherein said secondary particles are present independent of one another. - View Dependent Claims (2, 3, 4)
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5. A hardenable composition, comprising:
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scaly silica particles having a laminated structure, consisting essentially of secondary particles of foliar silica; and
a volatile liquid;
wherein each of said secondary particles is formed by a plurality of primary particles of scaly silica which are overlaid one on another and aligned face-to-face in parallel with one another; and
wherein said secondary particles are present independent of one another. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A hardened product, comprising:
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secondary particles of foliar silica formed by a plurality of primary particles of scaly silica overlaid one on another and aligned face-to-face in parallel with one another;
wherein the secondary particles are laminated in parallel with one another. - View Dependent Claims (12, 13)
wherein an average particle size of the secondary particles of foliar silica is less than 1 μ
m; and
wherein said hardened product is substantially transparent;
wherein a transmittance of light having a wavelength of 500 nm is at least 70%, as calculated for a layer thickness of 50 μ
m.
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14. A process for producing scaly silica particles suitable for a hardenable composition, comprising:
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(1) subjecting either silica hydrogel, silica sol or hydrous silicic acid to hydrothermal treatment in the presence of an alkali metal salt to form tertiary agglomerated particles of scaly silica comprising secondary particles of foliar silica, each formed by a plurality of primary particles of scaly silica which are overlaid one on another and aligned face-to-face in parallel with one another, and tertiary particles formed by the secondary particles which are overlaid one on another three dimensionally irregularly to have pore spaces; and
(2) disintegrating and dispersing the tertiary agglomerated particles of scaly silica to form foliar silica particles consisting essentially of secondary particles containing substantially no tertiary particles;
wherein said hardenable composition consist essentially of secondary particles of foliar silica which have a laminated structure; and
wherein the secondary particles are present independent of one another. - View Dependent Claims (15, 16, 17, 18)
wherein a temperature of the hydrothermal treatment is from 150 to 220°
C.;
wherein the total molar ratio of SiO2/Me2O is from 4 to 15 mol/mol; and
wherein Me is an alkali metal.
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17. The process for producing scaly silica particles according to claim 14, wherein the disintegration and dispersion of the tertiary agglomerated particles of silica are carried out using a wet system pulverizing apparatus.
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18. The process for producing scaly silica particles according to claim 17, wherein the disintegration and dispersion of the tertiary agglomerated particles of silica are carried out using a high speed mechanical stirring wet system pulverizing apparatus employing medium beads.
Specification