Heat-resistant aluminum hydroxide and method for preparation thereof
AssigneeKawai-Lime Ind. Co. Ltd.
InventorsHirofumi Mitsunaka, Kenji Kido, Hirokazu Kihou
Life of this patent
Estimating the term…
Abstract
A heat-resistant aluminum hydroxide which is prepared by subjecting a mixture of aluminum hydroxide with a reaction retardant for retarding the conversion aluminum hydroxide to boehmite, as a raw material, to the hydrothermal treatment or to pressurization and heating in a steam atmosphere; and a method for preparing a heat-resistant aluminum hydroxide which comprises subjecting a mixture of aluminum hydroxide with a reaction retardant for retarding the conversion aluminum hydroxide to boehmite as a raw material to the hydrothermal treatment, or to pressurization and heating in a steam atmosphere.
Claims10
A heat-resistant aluminum hydroxide produced by a hydrothermal treatment of a raw material mixture of aluminum hydroxide and at least a boehmite conversion reaction retarder selected from the group consisting of lactic acid, phosphoric acid, silica, silane-coupling agent, white carbon, sodium dihydrogen bisphosphate 1 hydrate, fumaric acid, sodium dihydrogen phosphate, tartaric acid, diatomaceous earth, sodium metaphosphate, sodium hexametaphosphate, and siloxane under a processing temperature at 170° C. or more and 250° C. or less, and said heat-resistant aluminum hydroxide has a boehmite and where said boehmite is 14% or less of the total weight of the product obtained by said hydrothermal treatment.
A heat-resistant aluminum hydroxide, wherein said hydroxide has a 1% dehydration temperature of 255° C. or more and a total amount of dehydration water of 30% or more.
A method of producing a heat-resistant aluminum hydroxide, further comprising processing a raw mixture of aluminum hydroxide and at least a boehmite conversion reaction retarder selected from the group consisting of lactic acid, phosphoric acid, silica, silane-coupling agent, white carbon, sodium dihydrogen bisphosphate 1 hydrate, fumaric acid, sodium dihydrogen phosphate, tartaric acid, diatomaceous earth, sodium metaphosphate, sodium hexametaphosphate, and siloxane by hydrothermal treatment under a processing temperature at 170° C. or more and 250° C. or less and said heat-resistant aluminum hydroxide has a boehmite and where said boehmite is 14% or less of the total weight of the product obtained by said hydrothermal treatment.
Dependencies are inferred from the claim text.