Magnesium hydroxide, process for its production and resin composition containing it
AssigneeAsahi Glass Company, Limited
InventorsKeiichi Nakaya, Kunio Tanaka, Fukuo Kanno, Mitaka Kobayashi
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Abstract
Magnesium hydroxide of a substantially spherical particle form having an average particle size of from 5 to 500 .mu.m and a specific surface area of from 25 to 1 m.sup.2 /g.
Claims15
Magnesium hydroxide of a substantially spherical particle form having an average particle size of from 5 to 500 .mu.m and a specific surface area of from 25 to 1 m.sup.2 /g.
A process for producing magnesium hydroxide, which comprises reacting an aqueous solution containing a water-soluble magnesium salt, with ammonia while controlling the load for crystallization of magnesium hydroxide at a level of not higher than 500 kg/m.sup.3. hr and the magnesium hydroxide slurry concentration in the crystallization apparatus at a level of from 1 to 60% by weight, to have magnesium hydroxide crystallized as substantially spherical particles having an average particle size of from 5 to 500 .mu.m and a specific surface area of from 25 to 1 m.sup.2 /g.
A resin composition prepared by blending a curable compound having an ester bond and/or a carboxylic acid group and containing an unsaturated bond, or a mixture containing such a curable compound, with from 5 to 85% by weight, based on the curable compound, of magnesium hydroxide particles of a substantially spherical particle form having an average particle size of from 5 to 500 .mu.m and a specific surface area of from 25 to 1 m.sup.2 /g as measured by BET method, followed by curing.
A resin composition comprising (a) from 15 to 50% by weight of a curable compound having an ester bond and/or a carboxylic acid group and containing an unsaturated bond, or a mixture containing such a curable compound, (b) from 50 to 84% by weight of a mixture of aluminum hydroxide and magnesium hydroxide of a substantially spherical particle form having an average particle size of from 5 to 500 .mu.m and a specific surface area of from 25 to 1 m.sup.2 /g as measured by BET method, the amount of the aluminum hydroxide being not higher than 20% by weight, and (c) from 1 to 35% by weight of at least one additive selected from the group consisting of asbestos, glass powder, calcium carbonate, calcium silicate, kaolin, talc, clay, glass fiber, carbon fiber, metal fiber, potassium titanate fiber, mica, crystalline or non-crystalline quartz powder, "silus" balloons, glass balloons, glass beads and alumina.
Dependencies are inferred from the claim text.