Loading patent…
AssigneeCatalysts & Chemicals Industries Co., Ltd.
InventorsTSUGUO KOYANAGI, HIROYASU NISHIDA
Estimating the term…
The inorganic compound sol of the present invention comprises a dispersion medium and, dispersed therein, inorganic compound particulates whose surface has been modified by an organic compound exhibiting a molecular polarizability of from 2×10−40 to 850×10−40 C2m2J−1. This inorganic compound sol modified by an organic compound has desirable affinity with dispersion media, so that its dispersion stability in solvents is excellent without aggregation of particulates.
An inorganic compound sol comprising a dispersion medium and, dispersed therein, inorganic compound particulates whose surface has been modified by an organic compound exhibiting a molecular polarizability of from 2×10−40 to 850×10−40 C2 m2J−1.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Inorganic: modified by treatment with other compounds
Nanotechnology for materials or surface science
Silicic acid: treatment with organo-silicon compounds
Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties: treatment with…
Term end not estimated
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to an inorganic compound sol having inorganic compound particulates dispersed in a dispersion media, which inorganic compound sol can be used in a coating material, a hard coating agent, an insulating coat and a protective coat of electrical and electronic part, an additional agent of cement, and a binder of inorganic fiber, etc. More particularly, the present invention is concerned with an inorganic compound sol in which the surface of inorganic compound particulates is modified by a specified organic compound to thereby exhibit excellent dispersion stability in dispersion media.
Particulates of an inorganic oxide such as silica or alumina must generally have their surface rendered hydrophobic for obtaining an organic solvent dispersion thereof. Thus, generally, the surface of such particulates is modified.
A method of modifying the surface of such inorganic compound particulates comprises reacting, for example, a reactive monomer or a coupling agent with hydroxyl groups of the particulate surface. This method is carried out, for example, by dispersing powdery particulates in an organic solvent and adding a modifier to the dispersion to thereby modify the particulate surface, or by conducting a solvent substitution so as to replace water of an aqueous dispersion of particulates by an organic solvent and adding a modifier to the dispersion to thereby modify the particulate surface.
The present invention will now be illustrated in greater detail with reference to the following Examples, which in no way limit the scope of the invention.
500 g of a silica/alumina water dispersion sol (Catalysts & Chemicals Industries Co., Ltd., Cataloid-SN, weight ratio of SiO2/Al2O3=285.7, average particle size: 12 nm and solid content: 20% by weight) was used as a starting material and subjected to a solvent displacement by means of an ultrafilter to thereby replace the water by methanol. Thus, there was obtained a methanol dispersion sol having a solid content of 30% by weight.
300 g of this sol was mixed with 2700 g of ethanol, and 8.4 g of γ-glycidoxypropyltrimethoxysilane was added to the mixture. The mixture was agitated for 1 hr, thereby obtaining a sol containing silica/alumina particulates whose surface was modified by γ-glycidoxypropyltrimethoxysilane.