Heat conductive paste and method for producing the same
AssigneeNamics Corporation
InventorsKoji SASAKI, Hiroki MARUYAMA
Life of this patent
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Abstract
A heat conductive paste including silver fine particles having an average particle diameter of primary particles of 40 to 350 nm, a crystallite diameter of 20 to 70 nm, and a ratio of the average particle diameter to the crystallite diameter of 1 to 5, an aliphatic primary amine and a compound having at least one phosphoric acid group. The heat conductive paste includes 1 to 40 parts by mass of the aliphatic primary amine and 0.001 to 2 parts by mass of the compound having at least one phosphoric acid group based on 100 parts by mass of the silver fine particles. The heat conductive paste has a high conductivity.
Claims19
A heat conductive paste comprising:
- silver fine particles having an average particle diameter of primary particles of 40 to 350 nm, a crystallite diameter of 20 to 70 nm, and a ratio of the average particle diameter to the crystallite diameter of 1 to 5,
- an aliphatic primary amine, and
- a compound having at least one phosphoric acid group.
A heat conductive paste produced by:
- mixing a silver salt of a carboxylic acid and an aliphatic primary amine, then,
- adding a reducing agent thereto, and
- mixing a compound having at least one phosphoric acid group with a reaction mixture containing silver fine particles.
A method for producing a heat conductive paste comprising the steps of:
- (1) mixing a silver salt of a carboxylic acid and an aliphatic primary amine to form a mixture,
- (2) adding a reducing agent to the mixture of step (1) at a reaction temperature of 20 to 80° C. to form a reaction mixture,
- (3) separating layers of the reaction mixture of step (2) and recovering a layer containing silver fine particles, and
- (4) mixing a compound having at least one phosphoric acid group with the layer containing the silver fine particles.
Dependencies are inferred from the claim text.