US 5,961,943 AGranted

Regularly-shaped aluminosilicate and its use

AssigneeMizusawa Industrial Chemicals, Ltd.

InventorsYoshinobu Komatsu, Hiroshi Ogawa, Kazuyoshi Sugano, Hideyuki Nakagawa

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Abstract

A regularly-shaped aluminosilicate useful as a blending agent for resins and coating materials, featuring low hygroscopic property, excellent pigment property, being capable of being easily dispersed in resins, and making it easy to carry out the blending operation. The regularly-shaped aluminosilicate comprises regularly-shaped sodium aluminosilicate particles obtained by firing a synthetic A or Pc zeolite, and has a nepheline or carnegieite crystalline structure, and further has an average particle diameter of from 0.5 to 30 .mu.m, an apparent specific gravity of from 0.3 to 0.8 g/cm.sup.3, an amount of oil absorption of not larger than 50 ml/100 g, a refractive index of from 1.46 to 1.56, and an amount of moisture absorption of smaller than 1% at a relative humidity of 90%.

Claims8

Dependent claims

A regularly-shaped aluminosilicate comprising cubic or spherical regularly-shaped particles having a chemical composition expressed by the following formula (1),

mM.sub.2/x O.multidot.Al.sub.2 O.sub.3 .multidot.nSiO.sub.2( 1)
wherein m is a number of from 0.9 to 1.1, M is at least one of Na, K, Ca, Mg or Zn, x is a valency of M, and n is a number of from 1.9 to 3.6, and having a nepheline or a carnegieite crystalline structure, said regularly-shaped particles having a BET specific surface area of at least 10 m.sup.2 /q, an apparent specific gravity of from 0.3 to 0.8 g/cm.sup.3, an amount of oil absorption of not larger than 50 ml/100 g, a refractive index of from 1.46 to 1.56, and an amount of moisture absorption of not larger than 1% when the particles are exposed to an atmosphere of a relative humidity of 90% and a temperature of 20 to 25.degree. C. for 48 hours.

Dependencies are inferred from the claim text.