Filler and glass composition, and process for producing hexagonal phosphate-based compound

Patent metadata

Field	Value
Publication number	US-9714170-B2
Application number	US-201415037220-A
Country	US
Kind code	B2
Filing date	Nov 13, 2014
Priority date	Nov 20, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A filler that can suppress thermal expansion of a glass composition with a small amount thereof added and is also excellent in terms of flowability when the glass composition is melted, and a glass composition containing the filler are provided. There is also provided a process for producing a hexagonal phosphate-based compound that can be suitably used as the filler using a simple, industrially advantageous method.
The filler of the present invention contains a hexagonal phosphate-based compound that has a purity of 90% or higher and is represented by the following Formula 1, the filler having a content of an ionic compound that is no greater than 1.0 wt %,

K a Zr b (PO 4 ) 3   (1)
wherein, in Formula 1, a is a positive number of from 0.8 to 1.2 and b is a positive number satisfying a+4b=9.

First claim

What is claimed is:

1. A process for producing a hexagonal phosphate-based compound represented by the following Formula 1, the process comprising:
obtaining a mixture by combining a layered zirconium phosphate, a potassium-containing compound, and a zirconium-containing compound other than the layered zirconium phosphate;
calcining the mixture; and
grinding subsequent to the calcining:
K a Zr b (PO 4 ) 3   (1)

wherein, in Formula 1, a is a positive number of from 0.8 to 1.2 and b is a positive number satisfying a+4b=9.

2. The process for producing a hexagonal phosphate-based compound according to claim 1 , wherein the layered zirconium phosphate comprises particles having a median diameter on a volume basis measured by a laser diffraction type particle size distribution analyzer of from 0.05 to 10 μm.

3. The process for producing a hexagonal phosphate-based compound according to claim 1 , wherein the potassium-containing compound is combined in an amount per mole of the layered zirconium phosphate of from 0.8 to 1.2 times a theoretical amount of the hexagonal phosphate-based compound to be produced.

4. The process for producing a hexagonal phosphate-based compound according to claim 1 , wherein a calcining temperature is from 650° C. to 1,500° C.

Assignees

• Toagosei Co Ltd

Inventors

• IIDA Miki
• Ono Yasuharu

Classifications

• C03C3/16

  containing phosphorus · CPC title

• C03C2214/16

  Microcrystallites, e.g. of optically or electrically active material · CPC title

• C03C2205/00

  Compositions applicable for the manufacture of vitreous enamels or glazes · CPC title

• C01B25/45 Primary

  containing plural metal, or metal and ammonium · CPC title

• C03C1/00

  Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels · CPC title