Yoshino Gypsum Co., Ltd.

Otsuka Kagaku Kabushiki Kaisha

Mitsubishi Chemical Industries Limited

Michio Nishi

Itaru Yokoyama

Yoshinobu Abe

Mitsuo Uchida

Shizuo Taira

Takehiro Tanaka

Mamoru Kaneko

Nobuhiko Takeda

Tadashi Yamada

Ichiro Terada

Naomasa Sugiyama

There are provided a method of recovering a base paper for gypsum board for continuously and efficiently recovering a base paper for gypsum board from a waste material of gypsum board including a gypsum core and the base paper for gypsum board adhering thereto. The method of recovering a base paper for gypsum board includes steps of breaking the waste material of gypsum board, separating a gypsum component and a paper piece of the base paper for gypsum board from the broken waste material of gypsum board, and washing the separated paper piece with water using a rotary drum-type washing device so as to eliminate a gypsum component adhering to the paper piece.

Method of recovering a base paper for gypsum board

High odor eliminating property is provided to a building material for interiors by compounding a hydrazide compound. Additionally, the odor eliminating property of the building material for interiors is improved and hygroscopicity and size stability at the time of use are provided by adding and compounding an organic carbide, an inorganic hygroscopic material, and a water repellent. Also, an interior structure in which these building materials for interiors are employed is provided.

Interior construction material having deodorizing activity

Building material for interiors having odor elilinating property and interior structure of building using the same

A water repellent gypsum composition comprising a gypsum, and a paraffin emulsion prepared by emulsifying (a) paraffin hydrocarbon having a melting point of 40.degree.-80.degree. C and (b) an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively, in the presence of a water soluble alkali compound. Optionally, a polymer emulsion or solution may be added.

Water repellent gypsum composition

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Tokyo, Japan

Michio Nishi