Nippon Polyurethane Industry Co., Ltd.

Tadashi Kimura

Mitsuhiro Yoshida

Shin Konishi

Toshihide Kobayashi

Seiki Suzuki

Kensuke Tani

Masashi Kanaya

Katsuhiko Sakurai

Osamu Ishizu

An adhesive composition for lignocellulose-type hot-pressed forms is disclosed which comprises (A) an organopolyisocyanate which is a polyisocyanate composed chiefly of from 20% by weight to 70% by weight of a diphenylmethane diisocyanate having two benzene rings in one molecule and from 80% by weight to 30% by weight of a diphenylmethane diisocyanate polynuclear condensate having at least three benzene rings in one molecule, and has a viscosity of 500 mPa&middot;s or less in the state of solid content&equals;100% by weight at 25&deg; C.; and (B) a wax emulsion prepared by emulsifying a wax (B1) which is a paraffin wax containing at least 80% by weight of a paraffin having 20 to 40 carbon atoms, and has a melting point of from 40&deg; C. to 100&deg; C., with an emulsifier (B2) which is an ethylene oxide polyaddition product of an aliphatic monoalcohol whose aliphatic chain has 14 to 20 carbon atoms. Also disclosed is a process for producing lignocellulose-type hot-pressed forms, using this adhesive composition. The adhesive composition has a good releasability from heating platens used in hot-press forming.

Adhesive composition for lignocellulose-type hot-pressed forms, and hot-pressed form production process using the same

A process is provided for producing a compression molded article of a lignocellulose type material by use of an organic polyisocyanate compound as a binder. The process comprises carrying out adhesion by use of the following components (A) an organic polyisocyanate, (B) an aqueous emulsion of a wax having a melting point ranging from 50.degree. C. to 160.degree. C., and (C) an organic phosphate ester derivative and optionally (D) water. The compression molded article can readily be released from the mold, and has excellent physical properties.

Process for producing compression molded article of lignocellulose type

A self-hardening mold material composition comprising 100 parts by weight of molding sand, 0.1 to 6 parts by weight of a component (a), 0.1 to 4 parts by weight of a component (b), 0.05 to 2.0 parts by weight of a component (c) as SiO.sub.2, and 0.01 to 0.5 parts by weight of a component (d) on the basis of 100 parts by weight of the component (b), wherein the component (a) is an organic polyisocyanate having at least two isocyanate groups; the component (b) is a polyetherpolyol mixtures comprising aminopolyetherpolyol, obtained by addition reaction of aliphatic or aromatic amine with alkylene oxide, and a non-aminopolyetherpolyol and containing 5 to 85% by weight of primary hydroxyl-containing polyetherpolyol, the component (c) is at least one of silicate ester, its hydrolysis products, a water dispersion-type silica sol and an alcohol dispersion-type silica sol; and the component (d) is a reaction catalyst, can produce a mold having a good strength after being left standing in the atmosphere at the ordinary temperature and after a molten metal is poured therein, a good shake-out when the mold is dismantled, without any need for mold wash at all or with a need only for simple mold wash.

Mold material composition and method for preparing mold

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Yokohama, Japan

Tadashi Kimura