Mizusawa Industrial Chemicals, Ltd.

Hiroo Inoue

Hiroshi Ogawa

Masahide Ogawa

Kiyoshi Abe

Teiji Sato

Kazuhiko Suzuki

Hideyuki Nakagawa

Mitsuo Saito

Hisashi Tsuchida

An additive for resins, a process for preparing amorphous definite particles used as an inorganic additive, and an olefin resin composition blended with the additive, and an agricultural film blended with the additive and a lithium-aluminum composite hydroxide carbonate. The additive for resins comprises amorphous definite particles having (1) a molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 of from 2.1 to 3.3 on the basis of oxides, (2) an average particle diameter of from 0.3 to 10 .mu.m, (3) a moisture regain at equilibrium (RH90%) of not greater than 10%, (4) a bulk density of from 0.5 to 1.2 g/ml, and (5) a pH in the form of an aqueous suspension of from 6 to 10, said amorphous definite particles being obtained by acid-treating and then heat-treating a Pc zeolite having a spherical particle shape, a notched surface and a molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 of from 2 to 3.4 on the basis of oxides, and said amorphous definite particles further having substantially the same particulate structure as that of said Pc zeolite.

Additive for resins, process for its preparation and olefin resin

Disclosed is a color developer for a pressure-sensitive recording paper, which comprises an acid-treated smectite clay mineral having a specific chemical composition, an X-ray diffraction pattern peculiar to dioctahedral smectite, a specific solid NMR spectrum and a specific cation exchange capacity. This color developer shows a high whiteness, a high initial color density, excellent light resistance and weatherability, and a low viscosity.

Pressure-sensitive recording paper and color developer therefor

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Shiunji, Japan

Hiroo Inoue