Scaly silica particles and hardenable composition containing them
AssigneesAsahi Glass Company, Limited, Dohkai Chemical Industry Co., Ltd.
InventorsKunihiko Terase, Masaki Inoue, Atsunari Fujii, Takayoshi Sasaki, Shikou Minohara, Yoshimi Ohba
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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.
Claims18
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.
A hardenable composition, comprising:
- 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.
A hardened product, comprising:
- 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.
A process for producing scaly silica particles suitable for a hardenable composition, comprising:
- (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.
Dependencies are inferred from the claim text.